JP6242580B2 - Composite molded body - Google Patents

Description

  The present invention relates to a composite molded body.

2. Description of the Related Art Conventionally, a decorative molded product in which a decoration such as a pattern is provided on the surface of an injection molded body has been used for various purposes.
As such a decorative molded product, a decorative layer is formed by performing decorative printing on one surface of a transparent resin material such as acrylic resin or polypropylene, and a resin base material is injection-molded on the printed surface of this decorative layer. There is known a surface-decorated molded body that is integrated by forming a base material layer (see, for example, Patent Document 1).

JP 2000-25161 A

However, in the layer configuration of the surface decorative molded article described in Patent Document 1, the adhesion between the decorative layer and the base material layer is inferior, and there is a risk of peeling.
An object of the present invention is to provide a composite molded body having excellent adhesion between a transparent molded body and an injection molded body.

In order to solve the above problems, the present invention provides the following composite molded body.
That is, the composite molded body of the present invention comprises a base material layer made of polypropylene, a welded layer made of polypropylene, a transparent molded body made of at least two layers, and an injection molded body obtained by injection molding, The polypropylene of the base layer has a melting enthalpy (ΔH) measured by differential scanning calorimetry (DSC) of 60 J / g or more and 200 J / g or less. The enthalpy (ΔH) is 10 J / g or more and 55 J / g or less, and the transparent molded body and the injection molded body are joined via the weld layer.
Furthermore, the composite molded body of the present invention comprises a transparent molded body consisting of at least two layers of a base material layer made of polypropylene and a welded layer made of polypropylene, and an injection molded body obtained by injection molding, The polypropylene of the base material layer has an isotactic pentad fraction of 80% or more, and the polypropylene of the weld layer has an isotactic pentad fraction of 10% to 75%. And the injection molded body are joined via the weld layer.
The base material layer made of the polypropylene of the present invention is a layer bonded to the injection-molded product via a welded layer. This base material layer is excellent in transparency and is made of a material having higher heat resistance and higher hardness than the welded layer. Preferable materials constituting the base layer include homopolypropylene, propylene-ethylene random copolymer, propylene-ethylene block copolymer and the like. Preferable production methods include, for example, a rapid cooling method by a single belt process, a method by addition of a nucleating agent, and the like.
The welding layer made of polypropylene of the present invention is a layer having excellent adhesion to an injection molded article. The welding layer is made of a material having a low melting enthalpy compared to the material related to the base material layer. By using the layer, it is expected that the transparent molded body and the injection molded body can be easily joined. Is done. As a preferable material constituting the weld layer, polypropylene having low stereoregularity is preferably used, and for example, thermoplastic olefin elastomer; Thermoplastic Olefinic elastomer (TPO) is preferably used. Moreover, a propylene-ethylene random copolymer can also be used suitably. Preferable production methods include, for example, a rapid cooling method by a single belt process, a method by addition of a nucleating agent, and the like.
The injection molded product of the present invention is obtained by injection molding. Specifically, the injection-molded body is obtained, for example, by injection-filling an injection molding material in an injection mold of an injection molding apparatus and cooling and solidifying it. Examples of the injection molding method include insert molding and in-mold molding. Examples of the injection molding material include an olefin resin, and specifically, a polypropylene resin.
In this invention, since the transparent molded body and the injection molded body are joined via the welded layer, the welded layer is dissolved to a degree sufficient to adhere to the injection molded body with heat during injection molding. Therefore, a composite molded body in which a transparent molded body and an injection molded body are laminated with high adhesiveness can be provided.

In the composite molded body of the present invention, it is preferable that the thickness ratio of the weld layer to the base material layer (the thickness of the weld layer / the thickness of the base material layer) is 1/1999 or more and 3/4 or less.
In this invention, since the thickness ratio of the welded layer to the base material layer (the thickness of the welded layer / the thickness of the base material layer) is 1/1999 or more and 3/4 or less, sufficient adhesiveness and rigidity are given to the transparent molded body. Can be granted.

  In the composite molded article of the present invention, the weld layer is preferably made of polypropylene having a melting enthalpy (ΔH) measured by differential scanning calorimetry (DSC) of 10 J / g or more and 55 J / g or less. Can be used. The welded layer using polypropylene that satisfies the melting enthalpy in the above range has a relatively low heating temperature necessary for softening and can be easily dissolved by the heat during injection molding. Can be laminated with higher adhesion.

The polypropylene satisfying the melting enthalpy in the above range is obtained by, for example, the following method, but is not particularly limited to the following method.
(1) A propylene-ethylene random copolymer having an ethylene content of 1% by mass to 15% by mass in the copolymer.
(2) Polypropylene having an isotactic pentad fraction of 10% to 75%.
(3) To the homopolypropylene, at least one of the propylene-ethylene random copolymer (1) and the polypropylene (2) is blended.

  In the composite molded body of the present invention, a polypropylene having a melting enthalpy (ΔH) of 60 J / g or more and 200 J / g or less can be suitably used as the polypropylene of the base material layer. The base material layer using polypropylene satisfying the melting enthalpy in the above range is not dissolved by heat during injection molding.

  Polypropylene satisfying the melting enthalpy in the above range is, for example, (1) a method of adjusting the ethylene content of the propylene-ethylene random copolymer, and (2) adjusting the isotactic pentad fraction of polypropylene to 80% or more. Or (3) a method of blending at least one of the propylene-ethylene random copolymer of (1) and the polypropylene of (2) above with homopolypropylene. In particular, it is not limited to the method described above.

In the composite molded body of the present invention, the polypropylene of the base material layer has a melt flow rate (MFR) of 0.1 g / 10 min or more and 50 g / 10 min or less, and the polypropylene of the weld layer has a melt flow rate ( MFR) is preferably 0.1 g / 10 min or more and 50 g / 10 min or less.
In this invention, when the MFR of the polypropylene of the weld layer is within the above range, an appropriate flow is obtained when the weld layer is melted by the heat at the time of injection molding, so the injection molded body and the weld layer are high. Can be bonded with adhesiveness. Moreover, if the MFR of the polypropylene of the base material layer is within the above range, a molded article having excellent dimensional stability can be obtained.

In the composite molded body of the present invention, it is preferable that a surface opposite to the surface on the weld layer side of the base material layer is a printing surface.
In this invention, it can decorate, without impairing the adhesiveness of a transparent molding body and an injection molding body by providing a printing surface in the surface on the opposite side to the surface by the side of the welding layer of a base material layer.

In the composite molded body of the present invention, at least one of the base material layer and the weld layer of the transparent molded body is made of a transparent polypropylene formed by quenching a molten resin at a cooling rate of 80 ° C./second or more. It is preferable that it is a layer.
In the present invention, at least one of the base material layer and the welding layer of the transparent molded body is a layer made of transparent polypropylene formed by quenching the molten resin at a cooling rate of 80 ° C./second or more. For this reason, even in a transparent molded body having a complicated shape, at least one layer of the base material layer and the welding layer is made of a rapidly cooled transparent polypropylene, so that it does not whiten, and a transparent molded body having excellent design properties is obtained. An excellent design property can be imparted to the composite molded body provided with the transparent molded body.

In the composite molded body of the present invention, the base material layer and the weld layer of the transparent molded body are layers made of transparent polypropylene formed by quenching a molten resin at a cooling rate of 80 ° C./second or more. Is preferred.
In this invention, the base material layer and the welding layer of the transparent molded body are layers made of transparent polypropylene formed by quenching the molten resin at a cooling rate of 80 ° C./second or more. For this reason, even if the transparent molded body has a complicated shape, the base material layer and the welded layer are made of rapidly-cooled transparent polypropylene, so that the transparent molded body having a better design can be obtained without whitening. An excellent design property can be imparted by the composite molded body provided with.

In the composite molded body of the present invention, the transparent molded body may have a configuration in which at least one site where the elongation rate is 150% or more is formed.
In this invention, the resin sheet is whitened even in a non-planar shape by providing a part molded with an elongation rate of 150% or more, that is, with a part having a complicated shape and partially extending to an elongation rate of 150% or more. It can be expected to provide a good decoration, and an excellent design can be imparted.

In the composite molded product of the present invention, the transparent molded body, and against the surface area X before being formed into a non-planar, the size ratio of the surface area Y after being molded into a non-planar (Y / X) it is, may be configured 1.5 to 10.
In this invention, the ratio (Y / X) of the size of the surface area Y after molding to the surface area X before molding of the resin sheet is a complex of 1.5 or more and 10 or less which increases the amount of deformation to be molded into a non-planar shape. Even if molded into a shape, the resin sheet can be expected to provide good decoration without whitening, and excellent design properties can be imparted.

In the composite molded product of the present invention, the transparent molded article, the thickness dimension A before being formed into a non-planar, the thickness B after being formed into a non-planar film thickness ratio ( B / a) is, may be configured molded has at least one place or more sites that are molded into 0.8 or less.
In the present invention, the film thickness ratio (B / A) of the thickness dimension B after molding to the thickness dimension A before molding of the resin sheet increases the elongation due to deformation of the non-planar portion. Even if it is molded into a complicated shape of 0.8 or less, the resin sheet can be expected to provide good decoration without whitening, and excellent design can be imparted.

It is a figure which shows schematic structure of an example of the composite molding in this embodiment. It is the schematic which shows the manufacturing apparatus of the transparent lamination sheet in this embodiment. It is the schematic for demonstrating the injection molding in this embodiment, (A) shows the state which has arrange | positioned the transparent lamination sheet between the movable mold | die and the stationary mold | die, (B) is transparent The laminated sheet is placed on an injection mold by pressure forming and a transparent molded body is formed. (C) shows a state in which an injection molding material is injected and filled.

Hereinafter, the composite molded body of this embodiment according to the present invention will be described with reference to the drawings.
[Composition of composite molding]
As a layer configuration of the composite molded body of the present embodiment, for example,
(A) Base material layer (quenched transparent polypropylene sheet) / welded layer / injection molded body (B) Base material layer / welded layer (quenched transparent polypropylene sheet) / Injection molded body (C) Base material layer (quenched transparent polypropylene sheet) / Welded layer (quenched transparent polypropylene sheet) / injection molded body (D) printed layer / base material layer (quenched transparent polypropylene sheet) / welded layer / injected molded body (E) printed layer / base material layer / welded layer (quenched transparent) Examples of the structure include polypropylene sheet) / injection molded body (F) printed layer / base material layer (quenched transparent polypropylene sheet) / welded layer (quenched transparent polypropylene sheet) / injection molded body.
The layer structure of the composite molded body of the present invention is not limited to the above structure. For example, you may use the transparent polypropylene sheet which ensured transparency by mix | blending additives, such as a nucleating agent, as a base material layer or a welding layer.

The “quenched transparent polypropylene sheet” is, for example, a sheet or film produced from a transparent polypropylene produced by a rapid cooling method described later.
Here, in the configurations of (D) to (F), even when the printing layer is weak against heat at the time of insert molding, for example, a good printing layer can be formed without being denatured by heat at the time of insert molding. Of these, the structure (F) is preferred.
The configuration is not limited to the above.

In FIG. 1, schematic structure of an example of the composite molding in this embodiment is shown.
As shown in FIG. 1, the composite molded body 1 of this embodiment includes a transparent molded body 2 and an injection molded body 3 obtained by injection molding. The transparent molded body 2 is composed of two layers of a base material layer 4 made of polypropylene and a welding layer 5 made of polypropylene. The transparent molded body 2 and the injection molded body 3 are joined via the weld layer 5.

[Transparent molding]
The transparent molded body 2 is composed of two layers of a base material layer 4 made of polypropylene and a welding layer 5 made of polypropylene.
At the time of injection molding, the transparent molded body 2 is obtained, for example, by pressure-molding a transparent laminated sheet in an injection mold and placing it in contact with the mold.

[Base material layer]
The base material layer 4 is formed from a transparent sheet or transparent film made of polypropylene. Examples of polypropylene include polypropylene resins. In addition, it means that it consists essentially only of polypropylene as a resin component which consists of polypropylene. That is, the material of the base material layer 4 may contain an additive in addition to the resin component as necessary. As the transparent sheet or transparent film, those produced by a rapid cooling method described later can be suitably used.
The transparency of the base material layer 4 is preferably such that the haze value is in the range of 0.1% to 60%.

It is preferable that the polypropylene of the base material layer 4 has a melting enthalpy (ΔH) of 60 J / g or more and 200 J / g or less as measured by differential scanning calorimetry (DSC). By setting the melting enthalpy (ΔH) of the polypropylene of the base material layer 4 within the above range, the base material layer 4 is not dissolved even by heat during injection molding, so that a molded body having excellent dimensional stability can be obtained. .
The differential scanning calorimetry (DSC) can be measured by increasing the temperature from 50 ° C. to 220 ° C. at a rate of 10 ° C./min after incubating at 50 ° C. for 5 minutes.

  Polypropylene satisfying the melting enthalpy in the above range is, for example, (1) a method of adjusting the ethylene content of the propylene-ethylene random copolymer, (2) a method of adjusting the isotactic pentad fraction of polypropylene to 80% or more, Alternatively, it can be achieved by (3) a method of blending at least one of the propylene-ethylene random copolymer of (1) above and the polypropylene of (2) above with homopolypropylene. In particular, it is not limited to the method described above.

  The polypropylene of the base material layer 4 preferably has an isotactic pentad fraction of 80% or more. If the isotactic pentad fraction of the polypropylene of the base material layer 4 is 80% or more, a transparent molded body having excellent crystallinity, excellent tensile properties and impact resistance, and a good balance with transparency is obtained. be able to. On the other hand, if the isotactic pentad fraction is less than the above range, the tensile elastic modulus and the like may decrease, which is not preferable.

Here, the isotactic pentad fraction is a method published by A. Zambelli et al. In Macromolecules, 6, 925 (1973), that is, a pentad fraction in a polypropylene molecular chain measured by ¹³ C-NMR. It shall be said. In other words, the isotactic pentad fraction is a fraction of a chain in which five propylene monomer units are continuously meso-bonded. The peak assignment can be performed based on the method described in Macromolecules, 8, 687 (1975). Specifically, the isotactic pentad unit may be measured as the intensity fraction of the mmmm peak in the total absorption peak in the methyl carbon region of the ¹³ C-NMR spectrum.

The polypropylene of the base material layer 4 preferably has a melt flow rate (MFR) of 0.1 g / 10 min or more and 50 g / 10 min or less. If the MFR of the polypropylene of the base material layer 4 is within the above range, a molded article having excellent dimensional stability can be obtained. If the MFR is less than the above range, there may be a flow failure at the time of forming the transparent laminated sheet, resulting in thickness fluctuations. If the MFR exceeds the above range, the melt tension is insufficient and the viscosity becomes low and transparent. Drawdown at the time of lamination sheet forming tends to occur, and extrusion moldability becomes poor.
The melt flow rate (MFR) can be measured by a method based on JIS K7210.

[Welding layer]
The welding layer 5 is formed from a transparent sheet or transparent film made of polypropylene. Examples of polypropylene include polypropylene resins. In addition, it means that it consists essentially only of polypropylene as a resin component which consists of polypropylene. That is, the material of the welding layer 5 may contain additives in addition to the resin component as necessary. As the transparent sheet or transparent film, those produced by a rapid cooling method described later can be suitably used.
The transparency of the weld layer 5 is preferably such that the haze value is in the range of 0.1% to 60%.

  The polypropylene of the weld layer 5 preferably has a melting enthalpy (ΔH) measured by DSC of 10 J / g or more and 55 J / g or less. By setting the melting enthalpy (ΔH) of the polypropylene of the weld layer 5 within the above range, the amount of heat necessary for softening is relatively low, and it can be easily dissolved by the heat during injection molding. The body 3 and the transparent molded body 2 can be laminated with higher adhesion.

The polypropylene satisfying the melting enthalpy in the above range is obtained by, for example, the following method, but is not particularly limited to the following method.
(1) A propylene-ethylene random copolymer having an ethylene content of 1% by mass to 15% by mass in the copolymer.
(2) Polypropylene having an isotactic pentad fraction of 10% to 75%.
Examples of such low stereoregularity polypropylene include thermoplastic olefin elastomers.
(3) To the homopolypropylene, at least one of the propylene-ethylene random copolymer (1) and the polypropylene (2) is blended.

  When the polypropylene of the weld layer 5 is random polypropylene, the ethylene content is preferably 1% by mass or more and 15% by mass or less. If the ethylene content of the random polypropylene is within the above range, the transparency of the weld layer 5 can be improved.

  When the polypropylene of the weld layer 5 is a low stereoregular polypropylene (thermoplastic olefin elastomer), the isotactic pentad fraction is preferably 10% or more and 75% or less. If the isotactic pentad fraction of polypropylene in the weld layer 5 is within the above range, the transparent molded body 2 is excellent in crystallinity, excellent in tensile properties and impact resistance, and in good balance with transparency. can do. On the other hand, if the isotactic pentad fraction is less than the above range, the tensile modulus may decrease, and if the isotactic pentad fraction exceeds the above range, the melting enthalpy increases. Since it becomes difficult to heat-seal | fuse, it is not preferable.

  The polypropylene of the weld layer 5 preferably has a melt flow rate (MFR) of 0.1 g / 10 min or more and 50 g / 10 min or less. If the MFR of the polypropylene of the weld layer 5 is less than 0.1 g / 10 minutes, sufficient flow cannot be obtained at the time of injection molding, so that the adhesiveness with the injection molded body 3 is deteriorated and may be easily peeled off. If the MFR exceeds 50 g / 10 min, the welded layer flows out due to the pressure of the injection resin, the adhesiveness with the injection molded body 3 is deteriorated, and there is a possibility that it is easy to peel off.

It is preferable that the thickness ratio of the weld layer 5 to the base material layer 4 (the thickness of the weld layer 5 / the thickness of the base material layer 4) is 1/1999 or more and 3/4 or less. Since the thickness ratio of the weld layer 5 to the base material layer 4 (thickness of the weld layer 5 / thickness of the base material layer 4) is 1/11999 or more and 3/4 or less, sufficient adhesiveness and rigidity for the transparent molded body 2 are obtained. Can be granted.
If the thickness ratio is less than 1/11999, where the thickness of the welded layer 5 is small, sufficient adhesive strength may not be obtained, and the transparent molded body 2 and the injection molded body 3 may be easily peeled off. If the thickness of the weld layer 5 exceeds 3/4, sufficient strength may not be obtained for the transparent molded body 2 and it may be easily broken.
Among these, the thickness ratio (thickness of the weld layer 5 / thickness of the base material layer 4) is particularly preferably 2/100 or more and 3/10 or less.
The thickness of the base material layer 4 is preferably 49 μm or more and 1999 μm or less.
The thickness of the welding layer 5 is preferably 1 μm or more and 300 μm or less.

In the transparent molded body 2, it is preferable that a surface 4 b opposite to the surface 4 a on the side of the welding layer 5 of the base material layer 4 is a printing surface.
The printing layer formed on the printing surface 4b is formed by printing a pattern or a color by a method such as screen printing, offset printing, gravure printing, roll coating, or spray coating. In addition, a metal vapor deposition made of a vapor deposition film, a laminate of a metal thin film, or the like can be used. In particular, the screen printing method is preferable because the ink film thickness can be increased, and therefore, ink cracking hardly occurs when the ink is formed into a complicated shape.
The ink used for printing is not particularly limited, and may be appropriately selected according to the material of the base material layer 4 and the like. For example, in the case of screen printing, IPX-HF979 black, POS-911 black, etc. manufactured by Teikoku Ink Manufacturing Co., Ltd. may be used.
In the case of screen printing, for example, the printing layer can be formed by printing using T-250 mesh and drying in a drying furnace at 60 ° C. for 90 minutes.

  Of the base material layer 4 and the welding layer 5 of the transparent molded body 2, at least one layer is preferably a layer made of transparent polypropylene formed by quenching the molten resin at a cooling rate of 80 ° C./second or more.

  It is preferable that the base material layer 4 and the welding layer 5 of the transparent molded body 2 are layers made of transparent polypropylene formed by quenching a molten resin at a cooling rate of 80 ° C./second or more.

Further, the transparent molded body 2 is formed in a complex shape having an elongation of 150% or more, preferably 180% or more and 500% or less, particularly 200% or more and 400% or less. That is, even if at least a part is molded into a complicated shape with an elongation of 150% or more, the transparent molded body 2 is not whitened, and it can be expected to avoid cracks and peeling in the printed layer.
Here, when the elongation rate is 150% or less, the deformation amount is small and whitening is not caused even with other materials, and it is not possible to cope with a desired complex shape. In addition, when elongation rate becomes larger than 800%, since there exists a possibility that whitening may arise in the transparent molding 2 or a crack, peeling, etc. may arise in a printing layer, it is preferable to set it as 800% or less.
And whitening can be visually evaluated from the outer side of a transparent molded object, for example, coloring the inside of a transparent molded object black with a coating material. When the transparent molded body is whitened, black appears to be whitened, but when it is not whitened, black appears to be clear. Further, the elongation rate can be controlled by conditions at the time of thermoforming such as the heating temperature at the time of thermoforming, the temperature of the mold, and the mold design.

The transparent molded body 2 has a surface area ratio (Y / X) which is a ratio of the size of the surface area Y after molding to the surface area X before molding, of 1.5 to 10 and preferably 1.7 to 5; Particularly, it is 2 or more and 4 or less. That is, even when the surface area ratio (Y / X) in which the amount of deformation of the portion formed into a non-planar shape is increased is 1.5 to 10 in a complicated shape, the transparent base material layer 4 is whitened. It can be expected to avoid cracks and peeling in the printed layer.
Here, in molding with a surface area ratio smaller than 1.5, the amount of partial deformation is small, and whitening does not occur even with other materials, and the desired complex shape cannot be accommodated. On the other hand, when the surface area ratio is larger than 10, the transparent molded body 2 may be whitened or the printed layer may be cracked or peeled off.
For example, in the case of a cube or a rectangular parallelepiped, the surface area can be calculated from the depth of the molded product and the measured value of each side with a caliper. In the case of a molded product that is difficult to calculate from a measured value such as a curve, it can be measured by a 3D scanner such as a non-contact 3D digitizer. Further, the surface area ratio can be controlled by, for example, conditions during thermoforming or mold design.

The transparent molded body 2 has a thickness ratio (B / A) of the thickness dimension B after molding to the thickness dimension A before molding of 0.8 or less, preferably 0.01 or more and 0.75 or less, particularly It becomes 0.05 or more and 0.7 or less. That is, even when the film thickness ratio (B / A) at which the elongation due to deformation of the portion formed into a non-planar shape increases becomes a complex shape having a thickness of 0.8 or less, the transparent base material layer 4 is whitened. It can be expected to avoid cracks and peeling in the printed layer.
Here, when the film thickness ratio (B / A) is larger than 0.8, the amount of partial deformation is small, and whitening does not occur even with other materials, and the desired complex shape cannot be accommodated. If the film thickness ratio (B / A) is smaller than 0.01, the transparent polypropylene layer may be whitened or the printed layer may be cracked or peeled. It is preferable.
The film thickness ratio can be controlled by, for example, conditions during thermoforming or mold design.

[Injection molding]
The injection molded body 3 is obtained by injection molding. Specifically, the injection molded body 3 is obtained by injecting and filling an injection molding material into an injection mold of an injection molding apparatus described later, and cooling and solidifying it. As described above, the injection molded body 3 is bonded to the transparent molded body 2 via the welded layer 5.
Examples of the injection molding material include an olefin resin, and specifically, a polypropylene resin.

[Configuration of transparent laminated sheet manufacturing equipment]
FIG. 2 is a schematic view showing a transparent laminated sheet manufacturing apparatus in the present embodiment.
The specific laminated polypropylene resin used as the base material layer and the specific propylene random copolymer used as the weld layer are formed into a sheet by a multilayer coextrusion method using the transparent laminated sheet manufacturing apparatus 10 shown in FIG. And a transparent laminated sheet can be manufactured by rapidly cooling this. The manufactured transparent laminated sheet is molded into a transparent molded body by, for example, pressure forming in an injection mold and placing it in contact with the mold at the time of injection molding to be described later.

The transparent laminated sheet manufacturing apparatus 10 shown in FIG. 2 includes an existing extruder such as a single screw extruder or a multi-screw extruder (not shown), and a T A die 12 is provided. Thereby, the specific polypropylene resin used as the base material layer and the specific propylene random copolymer used as the weld layer are coextruded from the T die 12 as a molten resin.
In addition, the raw material of the said polypropylene resin or a propylene random copolymer can be supplied with arbitrary forms, such as a pellet form, a powder form, and a granular form.
2 includes a first cooling roll 13, a second cooling roll 14, a third cooling roll 15 and a fourth cooling roll 16, a metal endless belt 17, a cooling water spray nozzle 18, and the like. The water tank 19, the water absorption roll 20, and the peeling roll 21 are provided.

The 1st cooling roll 13, the 2nd cooling roll 14, and the 3rd cooling roll 15 are metal rolls, and cooling means (illustration omitted), such as a water cooling type, is built in in order to make surface temperature control possible in the inside. Has been.
Here, the surfaces of the first cooling roll 13 and the second cooling roll 14 are covered with an elastic material 22 made of nitrile-butadiene rubber (NBR). The elastic material 22 preferably has a hardness (measured by a method according to JIS K6301A) of 60 degrees or less and a thickness of about 10 mm.
Note that at least one of the first cooling roll 13, the second cooling roll 14, and the third cooling roll 15 has a rotation shaft connected to a rotation driving means (not shown).

The fourth cooling roll 16 has a mirror surface with a surface roughness (surface roughness: Rmax based on JIS B 0601 “Surface roughness—definition and indication”) of preferably 2.0 μm or less, more preferably 1.0 μm or less. The metal roll (mirror cooling roll) is provided with a cooling means such as a water-cooling type (not shown) in order to adjust the surface temperature. Here, when surface roughness (Rmax) exceeds 2.0 micrometers, the glossiness of the transparent laminated sheet 11 obtained will become low, and it will become a sheet | seat with low transparency.
This 4th cooling roll 16 is arrange | positioned so that the sheet-like object 11a coextruded from the T-die 12 may be pinched | interposed between the 1st cooling roll 13 via the metal endless belt 17. FIG.
The endless belt 17 is made of stainless steel or the like, and has a mirror surface with a surface roughness of 1.0 S or less. The endless belt 17 is wound around the first cooling roll 13, the second cooling roll 14, and the third cooling roll 15 so as to be rotatable.

The cooling water spray nozzle 18 is provided on the lower surface side of the fourth cooling roll 16, and the cooling water is sprayed to the back surface of the endless belt 17 by the cooling water spray nozzle 18. In this way, by blowing cooling water from the cooling water spray nozzle 18, the endless belt 17 is rapidly cooled, and the sheet-like material 11 a immediately after the surface pressure contact with the first cooling roll 13 and the fourth cooling roll 16 is also obtained. It is cooling rapidly.
Further, the water tank 19 is formed in a box shape having an upper surface opened, and is provided so as to cover the entire lower surface of the fourth cooling roll 16. The water tank 19 collects cooling water sprayed on the back surface of the endless belt 17 and discharges the collected water from a discharge port 19 </ b> A formed on the lower surface of the water tank 19.

The water absorption roll 20 is installed on the side surface portion of the fourth cooling roll 16 on the second cooling roll 14 side so as to be in contact with the endless belt 17, and acts to remove excess cooling water adhering to the back surface of the endless belt 17. do.
The peeling roll 21 is arranged so that the sheet-like material 11a is guided and pressed against the second cooling roll 14 and the endless belt 17, and the sheet-like material 11a after the cooling is peeled off from the endless belt 17.

[Method for producing transparent laminated sheet]
The manufacturing method of the transparent lamination sheet 11 using the manufacturing apparatus 10 comprised as mentioned above is demonstrated.
First, each cooling roll (the first cooling roll) is preliminarily contacted with the extruded molten resin so that the surface temperatures of the endless belt 17 and the fourth cooling roll 16 for cooling the molten resin are maintained at the dew point or higher and 30 ° C. or lower. The temperature of the roll 13, the second cooling roll 14, the third cooling roll 15, and the fourth cooling roll 16) is controlled.

  Here, if the surface temperature of the fourth cooling roll 16 and the endless belt 17 is below the dew point, condensation may occur on the surface, and uniform film formation may be difficult. On the other hand, when the surface temperature is higher than 30 ° C., the transparency of the obtained transparent laminated sheet 11 is lowered, and α crystals are increased, which may make it difficult to perform thermoforming.

Next, the molten resin (not including the nucleating agent) extruded from the T-die 12 of the extruder is sandwiched between the endless belt 17 and the fourth cooling roll 16 on the first cooling roll 13. In this state, the molten resin is pressed by the first cooling roll 13 and the fourth cooling roll 16 and rapidly cooled.
At this time, the elastic material 22 is compressed and elastically deformed by the pressing force between the first cooling roll 13 and the fourth cooling roll 16.
The elastic material 22 is elastically deformed, that is, the arc-shaped portion corresponding to the central angle θ1 of the first cooling roll 13, and the sheet-like material 11 a obtained by quenching the molten resin is obtained by the cooling rolls 13 and 16. Surface pressure welding.
The surface pressure at this time is preferably 0.1 to 20 MPa.

The sheet-like material 11a that is press-contacted as described above and is sandwiched between the fourth cooling roll 16 and the endless belt 17 is then connected to the endless belt 17 at the arc portion corresponding to the substantially lower half circumference of the fourth cooling roll 16. The sheet is sandwiched between the four cooling rolls 16 and pressed in a planar manner, and further cooled rapidly by blowing cooling water onto the back side of the endless belt 17 by the cooling water blowing nozzle 18.
In addition, it is preferable that the surface pressure at this time is 0.01-0.5 MPa, and it is preferable that the temperature of a cooling water is 0-30 degreeC.
The sprayed cooling water is collected in the water tank 19, and the collected water is discharged from the discharge port 19A.

In this way, the sheet-like object 11a that is in close contact with the endless belt 17 after being cooled with the sheet-like object 11a and cooled between the fourth cooling roll 16 and the endless belt 17, As the endless belt 17 rotates, the endless belt 17 is moved onto the second cooling roll 14. Here, the sheet-like object 11a guided by the peeling roll 21 and pressed to the second cooling roll 14 side is planar by the endless belt 17 at the arc portion corresponding to the substantially upper half circumference of the second cooling roll 14 as described above. It is pressed and cooled again at a temperature of 30 ° C. or lower.
In addition, it is preferable that the surface pressure at this time is 0.01-0.5 MPa.
Further, the water adhering to the back surface of the endless belt 17 is removed by the water absorption roll 20 provided in the middle of the movement from the fourth cooling roll 16 to the second cooling roll 14.

The sheet-like material 11a cooled on the second cooling roll 14, that is, the transparent laminated sheet 11 formed by rapidly cooling the sheet-like material 11a, is peeled from the endless belt 17 by the peeling roll 21, and is taken up (not shown). Is wound at a predetermined speed.
The transparent laminated sheet produced as described above can be suitably used if the average spherulite radius is 4 μm or less, and the lower limit value is not particularly limited. If it is the method of the following disclosure, a thing 0.1 micrometer or more and 4 micrometers or less can be manufactured suitably, but it is not limited to this range. The sheet section has an average number of spherulites of 600 / mm ² or less, a solid density of 0.896 g / cm ³ or less, a gloss of at least one side of 90% or more, and a thickness of 50 μm or more.

  And the transparent laminated sheet 11 which consists of the quenching transparent polypropylene manufactured, for example, in the case of screen printing, POS-911 black ink by Teikoku ink manufacture company is printed using T-250 mesh, and 60 in a drying furnace. By drying at 90 ° C. for 90 minutes, a printed layer is laminated at a predetermined position on the surface.

[Configuration of injection molding device]
FIG. 3 is a schematic view for explaining injection molding in the present embodiment, and (A) shows a state in which a transparent laminated sheet is disposed between a movable mold and a fixed mold, and (B ) Shows a state where a transparent laminated sheet is placed in an injection mold by pressure forming and a transparent molded body is formed, and (C) shows a state where an injection molding material is injected and filled.

As shown in FIG. 3A, the injection molding apparatus 30 includes a movable mold 31 positioned on the upper side and a fixed mold 32 positioned on the lower side. The movable mold 31 and the fixed mold 32 are formed with substantially the same dimensions.
The movable side mold 31 has a concave portion 31 a having a predetermined shape on the surface facing the fixed side mold 32. The shape of the recess 31a is the shape on the surface side of the composite molded body after injection molding.
The fixed mold 32 has a convex portion 32 a having a predetermined shape on the surface facing the movable mold 31. The shape of the convex portion 32a becomes the shape on the back surface side of the composite molded body after the injection molding.

When the movable mold 31 and the fixed mold 32 are combined, that is, when the mold is clamped, a desired gap is formed between the recess 31a and the protrusion 32a. It is formed so that.
In addition, a plurality of air blowing holes 33 for blowing out air for pressure forming are provided in the convex portion 32 a of the fixed side mold 32. The air blowing hole 33 communicates with the side surface of the fixed mold 32 and is connected to the air supply pump 34 on the side surface of the fixed mold 32.
In addition, a gate 35 for filling an injection molding material is provided at the central portion of the convex portion 32 a of the fixed side mold 32.

[Production method of composite molded body]
A method for manufacturing the composite molded body 1 using the injection molding apparatus 30 configured as described above will be described.
First, the transparent laminated sheet 11 obtained by the manufacturing apparatus 10 described above is heated. And as shown in FIG. 3 (A), between the movable mold 31 located on the upper side and the fixed mold 32 located on the lower side, the heated transparent laminated sheet 11 is placed on the base layer 4 side. It arrange | positions so that the movable side metal mold | die 31 may be opposed.
Next, as shown in FIG. 3 (B), air is blown out from the air blowing hole 33 of the fixed side mold 32 to perform pressure forming, and the base material layer 4 side of the transparent laminated sheet 11 is formed into the recess 31 a of the movable side mold 31. Shape to touch. Thereby, the transparent molded body 2 is molded.

Next, as shown in FIG. 3C, the movable side mold 31 and the fixed side mold 32 are closed, and the injection molding material 36 melted from the gate 35 of the fixed side mold 32 by an injection molding machine (not shown). (Polypropylene resin) is injected and filled. The melted injection molding material is injected and filled in an injection mold so as to be laminated on the welded layer 5 side of the transparent molded body 2.
The weld layer 5 of the transparent molded body 2 is dissolved by the heat of the injection-molded injection molding material. Thereby, the injection molded body 3 is joined to the transparent molded body 2 via the welding layer 5.
Thus, the transparent molded body 2 is composed of two layers of the base material layer 4 and the welded layer 5, and the transparent molded body 2 and the injection molded body 3 are joined via the welded layer 5. Compared to a transparent molded body composed of only one layer, a composite molded body 1 with improved bonding strength between the transparent molded body 2 and the injection molded body 3 can be obtained.

After the injection-filled injection molding material 36 (polypropylene resin) is cooled and solidified, the upper and lower movable molds 31 and the fixed mold 32 are opened, and the molded product is taken out.
Thereby, the composite molded body 1 in which the injection molded body 3 is joined to the transparent molded body 2 via the welding layer 5 is obtained.
The conditions such as the resin temperature, injection pressure, and cooling at the time of injection molding can be appropriately selected according to the size of the molded body, etc., but usually 180 ° C. or higher and 250 ° C. or lower, pressure 5 MPa or higher and 120 MPa or lower. And cooling at a mold temperature of about 20 ° C. or more and 90 ° C. or less.

[Operational effects of this embodiment]
Therefore, according to this embodiment, the following effects can be produced.
(1) Since the transparent molded body 2 and the injection molded body 3 are joined via the welded layer 5, the welded layer 5 is dissolved to a degree sufficient to adhere to the injection molded body 3 by heat during injection molding. Therefore, the composite molded body 1 in which the transparent molded body 2 and the injection molded body 3 are joined with high adhesiveness can be provided.
(2) Since the thickness ratio of the weld layer 5 to the base material layer 4 (thickness of the weld layer 5 / thickness of the base material layer 4) is 1/1999 or more and 3/4 or less, sufficient adhesiveness to the transparent molded body 2 And rigidity.
(3) The melting enthalpy (ΔH) of the polypropylene of the base material layer 4 is in the range of 60 J / g or more and 200 J / g or less, and the melting enthalpy (ΔH) of the polypropylene of the weld layer 5 is in the range of 10 J / g or more and 55 J / g or less. . Therefore, the base material layer 4 is not melted by heat at the time of injection molding, and the welding layer 5 has a relatively low heating temperature necessary for softening, and can be easily melted by heat at the time of injection molding. Therefore, the injection molded body 3 and the transparent molded body 2 can be laminated with higher adhesion.
(4) Since the MFR of the polypropylene of the weld layer 5 is in the range of 0.1 g / 10 min or more and 50 g / 10 min or less, an appropriate flow is obtained when the weld layer 5 is melted by the heat during injection molding. Therefore, the injection molded body 3 and the welding layer 5 can be bonded with high adhesiveness. Moreover, since the MFR of the polypropylene of the base material layer 4 is in the range of 0.1 g / 10 min or more and 50 g / 10 min or less, a molded body excellent in dimensional stability can be obtained.

(5) When the polypropylene of the weld layer 5 is random polypropylene, since the ethylene content is 1% by mass or more and 15% by mass or less, the transparency of the transparent molded body 2 can be improved.
(6) When the isotactic pentad fraction of the polypropylene of the base material layer 4 is 80% or more and the polypropylene of the welding layer 5 is a low stereoregular polypropylene (thermoplastic olefin elastomer), the isotactic pentad The fraction is in the range of 10% to 75%. Therefore, it is possible to obtain a transparent molded body having excellent crystallinity, excellent tensile properties and impact resistance, and a good balance with transparency.

(7) By providing the printing surface 4b on the surface opposite to the surface of the base material layer 4 on the side of the welding layer 5, the decorative surface is obtained without impairing the adhesion between the transparent molded body 2 and the injection molded body 3. it can.
(8) The base material layer 4 and the welding layer 5 of the transparent molded body 2 are layers made of transparent polypropylene formed by quenching the molten resin at a cooling rate of 80 ° C./second or more.
For this reason, even in the transparent molded body 2 having a complicated shape, the base material layer 4 and the welded layer 5 are made of rapidly cooled transparent polypropylene, so that the transparent molded body 2 having more excellent design properties can be obtained without whitening. Excellent design properties can be imparted by the composite molded body 1 provided with the transparent molded body 2.

(9) The transparent molded body 2 is molded into a complex shape in which at least one portion of the layer made of the rapidly cooled transparent polypropylene has a portion having an elongation of 150% or more.
That is, even in a molding having a complicated shape and a part that is partially stretched to a stretch rate of 150% or more, the transparent molded body 2 can be expected to provide good decoration without whitening, and an excellent design Sex can be imparted.
(10) The resin sheet is molded into a complex shape having a portion where the ratio (Y / X) of the size of the surface area Y after molding to the surface area X before molding is 1.5 or more and 10 or less.
That is, even when the surface area ratio (Y / X) in which the amount of deformation of the non-planar portion is increased is molded to a complicated shape having a surface area ratio of 1.5 or more and 10 or less, the layer made of the rapidly cooled transparent polypropylene sheet is whitened. It can be expected that a good decoration is provided, and an excellent design property can be imparted.
(11) The transparent molded body 2 has a portion where the film thickness ratio (B / A) of the thickness dimension B after molding is 0.8 or less with respect to the thickness dimension A before molding of the resin sheet. Molded into a complex shape.
That is, even when the film thickness ratio (B / A) is increased to a large shape due to deformation of a portion formed into a non-planar shape, the layer made of the rapidly cooled transparent polypropylene sheet is whitened even when formed into a complicated shape of 0.8 or less. It can be expected that a good decoration is provided, and an excellent design property can be imparted.

[Modification]
In the said embodiment, although the layer which consists of the quenching transparent polypropylene manufactured by the rapid cooling method was employ | adopted for the base material layer 4, by mix | blending additives, such as a nucleating agent, with the base material layer 4 as needed. , Transparency may be ensured.
Moreover, you may mix | blend additives, such as a pigment, an effect inhibitor, a stabilizer, and a ultraviolet absorber, with the base material layer 4 and the welding layer 5 which comprise the transparent molded object 2, as needed.
Moreover, in the said embodiment, although it was set as the structure which manufactures two layers in the manufacturing apparatus 10 of the transparent lamination sheet 11, as a structure which manufactures only one layer of the base material layer 4 or only one layer of the welding layer 5, respectively. Also good. In this case, the base material layer 4 and the welding layer 5 that are manufactured may be stacked by a dry laminating method or the like.

Moreover, in the said embodiment, although the transparent laminated sheet 11 was shape | molded by pressure-pressure-molding in the injection mold and installing so that it might contact in this mold, the transparent laminated sheet 11 was preformed. The transparent molded body 2 may be molded by pre-shaped by pressure forming with a mold and then placed so as to be in contact with the injection mold.
Moreover, in the said embodiment, although the composite molding 1 was manufactured by injection molding, you may manufacture the composite molding 1 by injection compression (injection press) molding. This injection compression molding is a method in which the mold opening is opened to a desired molded product thickness or more, and after the molten resin is injected, the mold is closed to the desired molded product thickness and molded. It is suitable for reducing the injection clamping force of a molded product having a relatively large area and protecting the texture of the transparent molded body.
Moreover, in the said embodiment, although the combination of the concave shape and the convex shape was mentioned as a metal mold | die of an injection molding apparatus, according to the shape of a molded object, you may use a concave mold for both, for example. .

EXAMPLES Next, although an Example and a comparative example demonstrate this invention further in detail, this invention is not limited at all by these examples.
The evaluation methods shown in the examples and comparative examples are as follows.

(1) Adhesiveness Adhesive strength between the welded layer and the injection resin when a composite molded body was formed by injection molding was measured and evaluated as follows. The results are shown in Table 1 below.
Cut the transparent molded body part of the composite molded body to a width of 25 mm, and peel off the adhesive layer / base material layer film from the transparent resin layer with a tensile tester at a pulling speed of 0.3 m / min and 180 ° peel. The resistance value at that time was defined as the welding strength. When it was completely welded and the transparent molded body could not be peeled off from the composite molded body, it was expressed as “welded”.

(2) Whitening property The inside of the transparent molded body was colored black with a paint, and the whitening property was evaluated visually from the outside of the transparent molded body. When the transparent molded body was whitened, the black colored with the paint appeared to appear white, so it was determined as “x”. When the black colored on the inside looks clear (clear) even when viewed from the outside, the transparent molded product has not been whitened, and thus, “◎” is given.

[Example 1]
Using the manufacturing apparatus shown in FIG. 2, a transparent laminated sheet was manufactured under the following conditions.
Extruder diameter: 90mm
T-die 12 width: 800 mm
Base layer material: Polypropylene (PP) (melt flow rate 3.3 g / 10 min, homopolypropylene) (trade name: PL500A, manufactured by Sun Allomer Co., Ltd.)
Material for welding layer: Propylene-ethylene random copolymer (melt flow rate 5.7 g / 10 min, ethylene content 2.9% by mass, random polypropylene) (trade name: Prime Polypro, F-534N-4, Inc. (Made of prime polymer)
Take-up speed of sheet-like material 11a: 10 m / min Surface temperature of fourth cooling roll 16 and endless belt 17: 18 ° C.
923 ° C / sec cooling rate

Moreover, the composite laminated body was manufactured on condition of the following using the injection molding apparatus shown in FIG. 3 using the transparent lamination sheet obtained by the said method.
Dimension and shape of recess 31a: trapezoidal injection molding material 36: propylene-ethylene block copolymer (melt flow rate 9.0 g / 10 min, block, 75 mm square on the top, 72 mm square on the bottom, and 28.5 mm in depth) Polypropylene) (trade name: Prime Polypro J-715M, manufactured by Prime Polymer Co., Ltd.)
Resin temperature during injection molding: 200 ° C
Holding pressure: 58.6 MPa

[Example 2]
The material for the base material layer of Example 1 was used, and 30% by mass of polypropylene (melt flow rate 3.3 g / 10 min, homopolypropylene) (trade name: PL500A, manufactured by Sun Allomer Co., Ltd.) was used as the material for the welding layer. 70% by mass of stereoregular polypropylene (melt flow rate 2.8 g / 10 min, isotactic pentad fraction 70%, random polypropylene) (trade name: Prime TPO, E-2900, manufactured by Prime Polymer Co., Ltd.) A transparent laminated sheet was produced in the same manner as in Example 1 except that. Using this transparent laminated sheet, a composite molded body was obtained in the same manner as in Example 1.

[Example 3]
The material for the base material layer of Example 1 was used, and the low stereoregular polypropylene (melt flow rate 2.8 g / 10 min, isotactic pentad fraction 70%, random polypropylene) was used as the material for the welding layer (trade name) : Prime TPO, E-2900, manufactured by Prime Polymer Co., Ltd.) was used in the same manner as in Example 1 to produce a transparent laminated sheet. Using this transparent laminated sheet, a composite molded body was obtained in the same manner as in Example 1.

[Example 4]
A base layer material and a welding layer material obtained by adding 0.3% of Gelall MD (manufactured by Nihon Riken Co., Ltd.) as a nucleating agent to the base layer material and the welding layer material of Example 1 respectively. A transparent laminated sheet was produced in the same manner as in Example 1 except that the above was used. Using this transparent laminated sheet, a composite molded body was obtained in the same manner as in Example 1.

[Comparative Example 1]
A transparent sheet was produced in the same manner as in Example 2 except that the material for the weld layer was not used and only the material for the base material layer of Example 2 was used and single extrusion was performed by a T-die extruder. Using this transparent sheet, a composite molded body was obtained in the same manner as in Example 1.

As is clear from Table 1, in Comparative Example 1 using a transparent molded body composed of only the base material layer and having no welded layer formed, results of poor adhesion were obtained.
On the other hand, in Examples 1-4, it was confirmed that it is excellent in adhesiveness. From this result, it was found that a composite molded body having excellent adhesion to the injection molded body can be obtained by forming the transparent molded body from two layers of the base material layer and the welded layer.
Moreover, in Examples 1-3 using the layer which consists of a transparent polypropylene obtained by the rapid cooling method in both the base material layer and the welding layer of a transparent molded object, whitening has not arisen and it is in the shaping | molding of a complicated shape. It turned out to be excellent.

  DESCRIPTION OF SYMBOLS 1 ... Composite molded object, 2 ... Transparent molded object, 3 ... Injection molded object, 4 ... Base material layer, 4b ... Printing surface, 5 ... Welding layer, 10 ... Transparent laminated sheet manufacturing apparatus, 11 ... Transparent laminated sheet, 11a ... sheet-like material, 12 ... T die, 13 ... first cooling roll, 14 ... second cooling roll, 15 ... third cooling roll, 16 ... fourth cooling roll, 17 ... endless belt, 18 ... cooling water spray nozzle, DESCRIPTION OF SYMBOLS 19 ... Water tank, 20 ... Water absorption roll, 21 ... Peeling roll, 22 ... Elastic material, 31 ... Movable side metal mold, 32 ... Fixed side metal mold, 33 ... Air blowing hole, 34 ... Air supply pump, 35 ... Gate, 36 ... injection molding material.

Claims (11)

A transparent molded body composed of at least two layers of a base material layer made of polypropylene and a weld layer made of polypropylene;
An injection molded body obtained by injection molding;
With
The polypropylene of the base material layer has a melting enthalpy (ΔH) measured by differential scanning calorimetry (DSC) of 60 J / g or more and 200 J / g or less,
The polypropylene of the welding layer has a melting enthalpy (ΔH) of 10 J / g or more and 55 J / g or less,
The composite molded body, wherein the transparent molded body and the injection molded body are joined via the weld layer.   In the composite molded body according to claim 1,
  The base layer polypropylene has an isotactic pentad fraction of 80% or more, and the weld layer polypropylene has an isotactic pentad fraction of 10% to 75%.
  A composite molded body characterized by that. A transparent molded body composed of at least two layers of a base material layer made of polypropylene and a weld layer made of polypropylene;
An injection molded body obtained by injection molding;
With
The base layer polypropylene has an isotactic pentad fraction of 80% or more,
The weld layer polypropylene has an isotactic pentad fraction of 10% to 75%,
The composite molded body, wherein the transparent molded body and the injection molded body are joined via the weld layer. In the composite molded body according to claim 3 ,
The polypropylene of the base layer has a melting enthalpy (ΔH) measured by differential scanning calorimetry (DSC) of 60 J / g or more and 200 J / g or less. The enthalpy (ΔH) is 10 J / g or more and 55 J / g or less. In the composite molded body according to any one of claims 1 to 4 ,
The transparent molded body has an average spherulite radius of 4 μm or less, an average number of spherulites in a cross section of 600 / mm ² or less, a solid density of 0.896 g / cm ³ or less, a gloss of at least one side of 90% or more, and a thickness of 50 μm. A composite molded body characterized in that the above transparent laminated sheet is molded. In the composite molded body according to any one of claims 1 to 4 ,
The composite molded body, wherein a thickness ratio of the weld layer to the base material layer in the transparent molded body (thickness of the weld layer / thickness of the base material layer) is 1/1999 or more and 3/4 or less. In the composite molded body according to any one of claims 1 to 6 ,
When the polypropylene of the welding layer is random polypropylene, the ethylene content is 1% by mass or more and 15% by mass or less. In the composite molded body according to any one of claims 1 to 7 ,
The polypropylene of the base material layer has a melt flow rate (MFR) of 0.1 g / 10 min or more and 50 g / 10 min or less, and the polypropylene of the weld layer has a melt flow rate (MFR) of 0.1 g / 10 min. More than 50g / 10min. The composite molded object characterized by the above-mentioned. In the composite molded body according to any one of claims 1 to 8 ,
The composite molded body, wherein a surface opposite to the surface on the weld layer side of the base material layer is a printing surface. In the composite molded body according to any one of claims 1 to 9 ,
In the transparent molded body, the ratio (Y / X) of the size of the surface area Y after being formed non-planar to the surface area X before being formed non-planar is 1.5 or more and 10 or less. A composite molded body characterized by In the composite molded body according to any one of claims 1 to 10 ,
The film thickness ratio (B / A) of the thickness dimension B after the non-planar molding is 0.8 to the thickness dimension A before the non-planar molding of the transparent molded body is 0.8. A composite molded body characterized by having at least one or more of the following molded parts.

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