JPH02229014A - Manufacture of skin material adhered synthetic resin molding and apparatus used in this method - Google Patents

Abstract

PURPOSE:To adhere a skin material in the condition of not causing wrinkles and the like at the part of the complicated configuration of a synthetic resin molding by applying molten synthetic resin and a skin material between a die and another die meshed engagingly therewith, and pulling the skin material partly outward both die during the clamping period. CONSTITUTION:Since a skin material 5 is connected to the ends 7a of elastic spiral members 7 as pulling means 6 fixed on the outside of a synthetic resin molding die 1, the skin material 5 may be subjected to the pulling force in a die outward direction of the synthetic resin molding die 1 by the elastic restoring force to elastic spiral members 7 as being pulled between both die 2, 3 during the clamping period. Although the skin material 5 will be slightly pulled into both die 2, 3 while pulling the elastic spiral members 7, it is adhered onto the molten synthetic resin 4 in the condition of being tightened during the clamping period with the result that it may also be subjected to the pulling forces of the elastic spiral members 7. Any resin employed ordinarily in injection molding or extruding molding can be available as molten resin 4. As skin materials, they are given a cloth, nonwoven fabric, metal, fiber, net of thermosetting resin, paper, metallic foil or thermoplastic resin and sheet or film made of thermoplastic elastomer.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a method for producing a skin material-bonded synthetic resin molded article and an apparatus used in this method, and its purpose is to produce a skin material-bonded synthetic resin molded article. By applying a partial tensile force to the parts of the skin material that are bonded to the synthetic resin molded article where wrinkles are likely to occur, wrinkles etc. are removed from the skin material during the production of the skin material laminated synthetic resin molded article. A method for producing a synthetic resin molded article with a skin material bonded thereto, which does not cause the occurrence of molding, and also prevents the skin material from being molded while being entangled in the boundary area (weld line) where molten synthetic resin joins, and this method The aim is to provide equipment for use in

(Prior art) A synthetic resin molded body with a skin material bonded has a desirable appearance due to the luxury and warmth of the skin material, and greatly improves the cold texture characteristic of synthetic resin molded bodies, resulting in an aesthetically pleasing appearance. It is very desirable because it can be made into a molded body.

In fact, molded bodies obtained by molding these skin materials into bodies are often applied to interior parts of automobiles, interior decoration parts, and the like.

For example, the production of this skin material laminated synthetic resin molded article is shown in Fig. 4 (
A) It is carried out using the method shown in (B).

In this manufacturing method, a synthetic resin molded body bonded with a skin material is manufactured using a synthetic resin molding mold having a male mold (a) and a female mold (b).

A skin +a' fc) and a molten synthetic resin (d) are supplied between the molds (a) and fb) (FIG. 4(A)).

Note that this skin material (C) is supplied in a state fixed to the clamp frame (e).

Thereafter, each of the molds (a) and fb) is clamped to produce a skin material-bonded synthetic resin molded product (e).

(Problems to be Solved by the Invention) However, the conventional method for producing a skin material-bonded synthetic resin molded article has the following problems.

The first is a synthetic resin molded body in which a part of the synthetic resin molded body has a complicated shape, for example, as shown in FIG. As shown in B), this problem occurred when a skin material was bonded to a synthetic resin molded article (f) that partially had a convex portion (h).

When manufacturing a molded product in which a single skin material is bonded to a synthetic resin molded product having a part with a complicated shape as described above, the method shown in FIGS. 4(A) and (B) above is used. The method is
The skin material (e) is fixed in advance to the clamp frame (e) in a state where the same tension is applied over the entire surface during mold clamping.

After this, if the mold is clamped, the skin material (C) will become a molten synthetic resin (d
), the plain-shaped portion (j) is bonded to the skin material (C) without wrinkles or the like.

However, the skin IJ'tc+ bonded to the recess (g) and the convex portion (1]) has a larger inward direction than the portion of the skin material (C) bonded to the plain-shaped portion (j). subject to tension.

Therefore, the skin material (C) of the concave portion (g) and convex portion (h) is pulled inward because the outward tensile force (c+) is insufficient than the inward tensile force. The material was laminated onto a synthetic resin molded product in such a state that wrinkles were generated due to the intrusion.

The second problem is to use the method shown in Fig. 4 (A) and (B), for example, to supply molten synthetic resin from two molten synthetic resin paths to the mold (a), and then supply the skin material on top of this. This problem occurred when the mold was then clamped to produce a synthetic resin molded article with a skin material attached.

This second problem is that the skin material gets caught up in the weld line where the molten synthetic resin joins when the mold is clamped, and the weld line of the synthetic resin molded product (e) as shown in FIG. 5(C). This results in a molded product in which the skin material (C) is wrapped around (1).

The reason why the skin material fc) gets caught up in the weld line (1) is because a part of the molten synthetic resin flows in the direction of the welt line (i) while the skin material (C) is bonded during mold clamping. be.

(Means for Solving the Problems) The present invention provides a method for supplying a molten synthetic resin and a skin material between one mold and another mold that meshes with the mold, and clamping the two molds together to form a skin material. A method for producing a skin material-bonded synthetic resin molded product, the method comprising partially pulling the skin material outward from both molds during mold clamping. , consisting of a synthetic resin molding mold and a tensioning means, the synthetic resin molding mold having one mold and another mold meshing with this mold, and this synthetic resin molding mold having: The mold is for manufacturing a skin material bonded synthetic resin molded body by clamping the two molds, and the tensioning means is capable of partially pulling outward the skin material supplied into the synthetic resin molding mold. The above-mentioned conventional problems are solved by an apparatus for manufacturing a skin material-bonded synthetic resin molded body, which is characterized by the following.

The tensioning means may include an elastic thread whose starting end is fixed inside or outside the mold and whose terminal end can be connected to the skin material, or a movable member that pulls the elastic thread towards the outside of the mold during mold clamping. Examples include those in which the peripheral edge of the skin material is fixed in advance to a movable member, and the movable member is driven toward the outside of the mold by sliding contact with a sliding member.

(Function) After supplying the molten synthetic resin and the skin material between one mold and the other mold, when the molds are clamped, the skin material is pulled toward the outside of the mold by the tensioning means.

This tension is applied only partially, specifically, only to parts of the molded body having complex shapes such as convex portions and concave portions.

As a result, the part of the skin material that is pasted to a part with a complex shape is subjected to a stronger tensile force in the direction outside the mold than the part of the skin material that is pasted to a plain shape part. Therefore, wrinkles and the like do not occur in the bonded skin material.

When the tensioning means is an elastic screw, the elastic screw is pulled inward as the skin material is drawn into the mold during mold clamping.

However, since the starting end of this elastic thread is fixed,
An elastic restoring force acts in a direction opposite to the direction in which the skin material is drawn, and prevents the skin material from being drawn too far into the mold.

If the tensioning means is composed of an elastic thread and a movable member connected to the starting end of the elastic thread, the movable member is driven toward the outside of the mold during the mold clamping, thereby causing the elastic thread to tighten. Since the stripes are actively pulled toward the outside of the mold, the skin material is pulled more strongly (toward the outside of the mold) than when the aforementioned elastic threads are used alone.

When the tensioning means is composed of a movable member having a skin material fixing part and a sliding member slidingly in contact with this movable member, the skin material fixed to the skin material fixing part slides with the movable member during the mold clamping. It is pulled toward the outside of the mold by sliding contact with the member.

As a result, the skin material is actively pulled toward the outside of the mold, and the skin material is bonded to the molten synthetic resin with tension applied toward the outside of the mold.

Note that the sliding contact between the movable member and the sliding member is performed by sliding the slope portion of the movable member and the slope portion of the sliding member.

(Example) Hereinafter, an example of the present invention will be explained based on the drawings in Figure 1 (
A) A first embodiment of the device according to the invention is shown in (B).

(1) is a synthetic resin molding mold, and this synthetic resin molding mold (1) consists of one mold (2) that is vertically separated and another mold that meshes with this one mold (2). It consists of type (3).

The illustrated mold (2) is a male mold having a convex portion (2a), and the other mold (3) is a female mold having a cavity (3a).

In this invention, the illustrated synthetic resin mold (1)
is a part of a mold (part with a complicated shape).

A tensioning means (6) is disposed inside or outside the synthetic resin mold.

In the example, the tensioning means (6) is a mold for synthetic resin molding (1).
The molds (2) and (3) are disposed at substantially the same height as the engagement position of the two molds (2) and (3) when the molds are clamped.

In this first embodiment, the tensioning means (6) is an elastic thread (7).
The starting end (7a) of this elastic threaded body (7) is fixed to the fixing member (8).

The terminal end (7b) of this elastic screw body (7) is a free end,
It can be connected to a peripheral edge (5a) of a skin material (5) to be described later.

FIGS. 2A and 2B show a first embodiment of the device according to the invention.

' In this embodiment, the same mold as that used in the first embodiment is used as the synthetic resin molding mold (1).

In this embodiment, the movable member (
9) and an elastic thread (7), the tensioning means (6) being arranged in the same position as in the first embodiment.

The movable member (9) is provided so as to be movable in the horizontal direction along a fixed trajectory (not shown).

In this embodiment, the movable member (9) is a sloped portion (9i□l) facing toward the synthetic resin mold (1).
) is used, and this movable member (9) is movable in the horizontal direction by sliding contact with a sliding member 00) having a slope portion (10a) that slides on the slope portion (9a). There is.

This sliding member α0) is provided in the vicinity of the movable member (9), in the embodiment, connected to the above-mentioned metal mold (3), and provided on three sides of the movable member (9).

This sliding member flO+ may be connected to a telescoping device that is driven in synchronization with the clamping of both molds (2) i3j.

This sliding member 00) is, for example, a mold (3) according to tfif.
When driven downward according to the descent of the molds (
2) At the time of mold clamping in (3), the slope portion (10a) slides on the slope portion (9a) of the movable member (9), so that the movable member (9) moves in the horizontal direction (synthetic resin molding The mold (1) is driven in the outside direction of the mold (1).

In this embodiment, the starting end (7a) of the elastic thread (7) is fixed to the movable member (9).

The terminal end (7a) of this elastic thread (7) is a free end,
It can be connected to a peripheral edge (5a) of a skin material (5) to be described later.

A third embodiment of the device according to the present invention is shown in FIGS. 3(A) and 3(B).
This is a mold for synthetic resin molding [11 is the previous j
The same mold as in the first and second embodiments is used.

In this embodiment the tensioning means (6) are connected to the movable member (9)
and a sliding member 00).

As in the second embodiment, the movable member (9) follows a fixed trajectory (
It is movable along -U (shown in the figure) and has an inclined surface (9a) facing the synthetic resin molding die f1+.

Moreover, the upper surface of this movable member (9) is attached to the skin material fixing part (9b
), and a peripheral portion (5a) of a skin material (5), which will be described later, is fixed to this skin material fixing portion (9b) with a bottle (12) or the like.

The sliding member 00) is provided below the movable member (9).

Similar to the second embodiment, this sliding member 00) faces the slope part (9a) of the movable member (9) and has a slope part (10a).
It is made to be able to expand and contract in the vertical direction by an expansion and contraction device (11).

In this embodiment, this sliding portion 1ioO) is set to be slid downward by the expansion and contraction device (1υ) in synchronization with the clamping movement of both molds f21+31.

As the telescopic device 01], a steel spring of a known hydraulic press cushion, a hydraulic cylinder, an air cylinder, etc. are used.

Further, the tensioning means (6) according to the present invention is shown in FIG. 5(A) (
When molding a synthetic resin molded article as shown in B), the protrusion (g) or recess (1) is placed near the part of the mold to be molded.

Next, a method for manufacturing a skin material-bonded synthetic resin molded article according to the present invention will be explained.

A molten synthetic resin (4) and a skin are placed between one mold (2) constituting the synthetic resin molding mold (1) and another mold (3) that meshes with this one mold (2). Supply material (5).

The molten plastic resin (4) is supplied by a well-known melt plasticizing means (not shown) such as an extruder through the molten plastic channel (2) provided in one mold (2) or the other mold (3). (not shown).

The skin material (5) is supplied between the two molds f2) (3) in a state in which it is in direct contact with the inner surface of the other mold (3) during mold clamping.

The peripheral edge (5a) of this skin material (5) is connected in advance to the tensioning means (6) during supply.

When the tensioning means (6) is in the above-mentioned first or second embodiment, the peripheral edge (5a) of the skin material (5) is connected to the end Om of the elastic thread (7).
(7a).

When the tensioning means (6) is in the third embodiment, the skin material (5)
The peripheral edge part (5a) of the movable member (9) is the skin material fixing part (9).
b) It is fixed and connected with a bottle (12) etc. on the top.

After connecting the skin material (5) to the tensioning means (6), one of the two molds (2) and (3) (the other mold (3) in the example) is moved using a well-known lifting mechanism (Fig. (not shown), and both molds (21 (3+) are clamped (Fig. 1 (B)
), 2V(B), 3(B)).

At this time, the skin material (5) is placed inside the mold (both molds (2)) in a complex part of the mold shape, compared to a simple part of the mold shape.
f3) Trying to be drawn into ).

However, in this invention, when the mold is clamped, the part of the skin material (5) that is bonded to the complex-shaped part is pulled by the tensioning means (6).
(3) Prevents being drawn into the gap too much.

The action of this tensioning means (6) will be explained below in accordance with the first, second, and third embodiments.

In the first embodiment, the skin material (5) is a mold for synthetic resin molding (1
) is a tensioning means (6) fixed outside the mold of the elastic screw (
Since it is connected to the terminal end (7a) of the elastic thread body (7), when the skin material (5) tries to be drawn between the two molds (21F3) during the mold clamping, it will be pulled in by the elastic restoring force of the elastic thread body (7). A tensile force is applied to the outside of the mold for synthetic resin molding ('').

This skin material (5) is pulled in between the two molds (2) (3+) to some extent while pulling the elastic threaded body (7), but as a result it also receives the tensile force of the elastic threaded body (7). When the mold is clamped, it is bonded onto the molten synthetic resin (4) with tension (see FIG. 1(B)).

In the second embodiment, the skin material (5) is a synthetic resin molding die f1.
．． ) is fixed outside the mold of the elastic thread (7).
), and this elastic thread (7) is connected to a movable member (9), which is connected to both molds (
2) (It is movable in the horizontal direction in synchronization with the mold clamping of 31.

As described above, the movable member (9) is movable in the horizontal direction by sliding with the sliding member α0) having the slope portion (10a) that slides on the slope portion (9a) of the movable member (9). One example is contact.

This sliding member 0[1] is set to slide vertically in synchronization with the movement of the two molds (21 (31) during mold clamping, so this sliding member 0[1] When the movable member (9) is slid into the movable member (9), the slope portion (IOa) comes into sliding contact with the slope portion (9a) of the movable member (9).
9) is driven in the horizontal direction (outward direction of the mold).

During mold clamping, the elastic thread (7) is pulled in conjunction with this movement of the movable member (9).

Therefore, during the mold clamping, the skin material (5) that is about to be drawn between the two molds (21 [3)] is more actively pulled out of the mold.

As a result, the skin material (5) is bonded onto the molten synthetic resin [4] under tension.

In the third embodiment, the peripheral edge (5a) of the skin (5) is fixed to the skin fixing part (9b) of the movable member (9).

In this example, the initial fixing position of the skin material (5) is as follows:
If both molds (2) (31) are clamped in this state, the skin material (5) will be drawn considerably between the meshing surfaces of both molds (2+ (31), and the skin material (5) will be slightly It is set at such a position that it is bonded to the molten synthetic resin (4) in a wrinkled state.

However, the movable member 9) is movable in the horizontal direction,
This movable member (9) comes into sliding contact with the sliding member 00) that is driven upward in synchronization with the clamping of both molds f2) [3), that is, the slope portion (10a>) of the sliding member 00). Movable parts (
9) moves toward the outside of the mold by sliding contact with the slope portion (9a).

As a result, the skin material (5), which has been fixed in advance to the skin material fixing part (9b) of the movable member (9), is pulled toward the outside of the mold when the mold is clamped, and the molten material is melted under tension. It is laminated onto the resin (4).

As the molten synthetic resin (4) used in the method of this invention, any resin commonly used in compression molding, injection molding and extrusion molding can be used, such as polypropylene, polyethylene, acrylonitrile-styrene-butadiene. Broxol copolymer, thermoplastic resin such as nylon, ethylene-propylene Broxol copolymer,
Non-foaming or foamable resins such as thermoplastic elastomers such as styrene-butadiene broth copolymers, and inorganic fillers, fillers such as glass fibers, pigments, lubricants,
Those containing additives such as antistatic agents can be used.

In addition, the skin material (5) used in this invention includes woven fabric, non-woven fabric, metal, fiber, thermoplastic resin 1-1 paper,
Examples include metal foil, thermoplastic resin, thermoplastic elastomer Sea I or Fill 1, and materials decorated with uneven patterns such as grains, printing, dyeing, or foam may also be used.

Furthermore, it is also possible to use these materials alone or in the form of a laminate made by laminating two or more of them using an adhesive.

When using this skin material (5), it may be preheated prior to supply in order to adjust the bowing stress and elongation of the skin material (5).

(Effect of the invention) This invention supplies a molten synthetic resin and a skin material between one mold and another mold that meshes with it, and clamps both molds to bond and synthesize the skin material. A method for manufacturing a resin molded article, the method comprising partially pulling the skin material outward of both molds during mold clamping, and a synthetic resin molding method. The synthetic resin molding mold has one mold and another mold that meshes with it, and the synthetic resin molding mold has both of the molds. This is a mold for manufacturing a skin material laminated synthetic resin molded article by clamping the mold, and the tensioning means is capable of partially pulling outward the skin material supplied into the synthetic resin molding mold. Since this is an apparatus for manufacturing a skin material-bonded synthetic resin molded article, it has the following effects.

In other words, when a skin material is laminated to a synthetic resin molded body whose part has a complicated shape, the skin material is laminated to the complex-shaped parts of the synthetic resin molded body (for example, convex portions and concave portions). Can be laminated while applying tension to the parts to be bonded.

Therefore, the skin material can be bonded to parts of the synthetic resin molded body where the shape is complex without causing wrinkles or the like.

In addition, even if the epidermis is bonded to a synthetic resin molded body formed by joining the molten synthetic resin supplied from the above-mentioned molten synthetic resin route, the epidermis will not be caught in the welt line. can be pasted.

[Brief explanation of the drawing]

Figure 1 (/l) (B) is a cross-sectional explanatory diagram of the first embodiment of this invention, Figure 2 (A) (B) is a cross-sectional explanatory diagram of the second embodiment of the same, and Figure 3 (^) ( B) is a cross-sectional explanatory diagram of the second embodiment of the same as above, FIGS. 4(A) and (B) are cross-sectional explanatory diagrams of the conventional manufacturing method of a synthetic resin molded body bonded with a skin material, and FIGS. 5(8) and (B) are
is a perspective view of a synthetic resin molded body having a part with a complicated shape,
FIG. 5(C) is a cross-sectional view of a skin material bonded synthetic resin molded article having a weld line. (1)...Synthetic resin molding mold (2)...One mold (3)...Other mold (4)
)...Fused synthetic resin (5)...Skin material (5a)・
...Periphery of skin material (6)...Tensile means (7)...Elastic thread (
7a)...Starting end (7b)...Ending end (9)...
・Movable member (9a)...Slope part (9b)...
Skin material fixing part

Claims (6)

[Claims] (1) A method of supplying a molten synthetic resin and a skin material between one mold and another mold that meshes with it, and clamping both molds to produce a skin material-bonded synthetic resin molded body. A method for producing a skin material-bonded synthetic resin molded article, characterized in that the skin material is partially pulled outward from both molds when the molds are clamped. (2) Consists of a synthetic resin molding mold and a tensioning means, the synthetic resin molding mold has one mold and another mold that meshes with this mold, and this synthetic resin molding mold has The mold is a mold for manufacturing a skin material bonded synthetic resin molded article by clamping the two molds, and the tensioning means partially pushes the skin material supplied into the synthetic resin molding mold outward. An apparatus for producing a synthetic resin molded article bonded with a skin material, characterized in that it is stretchable. (3) The tensioning means is an elastic thread whose starting end is fixed inside or outside the mold for synthetic resin molding, and the terminal end of this elastic thread is fed into the mold for synthetic resin molding. 3. The apparatus for producing a skin material-bonded synthetic resin molded article according to claim 2, wherein the device is capable of being connected to a skin material. (4) The tension means consists of a movable member and an elastic thread,
This movable member is provided outside or inside the mold for synthetic resin molding and is movable to the outside of the mold for molding synthetic resin, and the starting end of the elastic thread body is fixed to this movable member. 3. The apparatus for producing a skin material bonded synthetic resin molded article according to claim 2, wherein the terminal end thereof is connectable to a skin material supplied into a synthetic resin molding die. (5) The movable member is driven by sliding contact with a sliding member, the movable member has a sloped portion, and the sliding member has a sloped portion that slides into contact with the sloped portion formed on the movable member. 5. The apparatus for producing a skin material-bonded synthetic resin molded article according to claim 4. (6) The tensioning means includes a movable member and a sliding member, the movable member being provided inside or outside the mold for synthetic resin molding, and having a skin material fixing part and a slope part; The sliding member has a slope portion that slides into contact with the slope portion of the movable member,
3. The apparatus for manufacturing a skin material-bonded synthetic resin molded body according to claim 2, wherein the movable member is movable outward of the synthetic resin mold by sliding contact between the sloped parts.