JPH06190867A - Synthetic resin window and molding method therefor - Google Patents

Abstract

(57) [Abstract] [Purpose] When molding the window frame part, when mounting the window part in the window frame part molding die and then injection molding thermoplastic resin,
Provided is a synthetic resin window in which the window portion is not deformed by molding pressure and a method for molding the window. [Structure] A synthetic resin window 1 includes a window portion 10 made of a thermoplastic resin and an outer peripheral portion 12 of the window portion 10 made of a thermoplastic resin.
The window portion 20 and the window frame portion 20 are integrated with each other, and the outer peripheral portion 12 of the window portion 10 is provided with the protruding portion 14 protruding from the surface thereof. The method of molding a synthetic resin window in which the window portion and the window frame portion are integrated is
(A) A step of molding a window portion made of a thermoplastic resin and having a protrusion protruding from the surface of the outer peripheral portion by an injection molding method, and (b) made of a thermoplastic resin, covering the outer peripheral portion of the window portion. And the step of molding the window frame portion by an injection molding method.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synthetic resin window and its molding method.

[0002]

2. Description of the Related Art A large number of windows are installed in automobiles, various transportation facilities and buildings. Inorganic glass is now widely used for these windows. For example, windows installed in automobiles and various transportation facilities (hereinafter also referred to as vehicle windows)
Most of them are composed of a window part made of inorganic glass, and in some cases, a window frame part made of a soft synthetic resin is attached to the outer peripheral part of the window part. Inorganic glass has the drawbacks of being heavy and poor in impact resistance. Also,
It takes a considerable number of man-hours and time to attach a mounting bracket for attaching a window to an automobile or the like and a window frame portion to the window portion. Therefore, as a vehicle window, improved safety, reduced weight,
From the viewpoint of reducing fuel consumption by reducing weight, reducing man-hours, etc., practical application of windows made of high-quality synthetic resin that are lightweight and have excellent impact resistance is awaited.

The window portion of a vehicle window made of synthetic resin is usually formed by injection molding a thermoplastic resin. Then, after the molding of the window portion, a hard coat treatment is applied to the surface of the window portion to apply a hard coat treatment liquid made of, for example, a silicone resin. Next, the window frame portion manufactured in another step is attached to the outer peripheral portion of the window portion. Alternatively, the window portion is mounted in a mold for molding the window frame portion, and then the soft thermoplastic resin is injection-molded to form the window frame portion, and the window frame portion and the window portion are integrated. To do.

[0004]

In the conventional method of molding a synthetic resin window in which the window frame portion is molded by injection molding,
There is a problem that the window portion is deformed by the molding pressure when the window portion is mounted in the window frame portion molding die and then the soft thermoplastic resin is injection-molded. Also, in some cases, the flow of the molten resin in the window frame molding die is disturbed by the deformed window, and the predetermined window frame may not be molded.

Further, when the hard coat treatment liquid is applied to the surface of the window, if the window has a curved portion, the film thickness of the hard coat treatment liquid at the curved portion varies. There is also a problem that dust adheres to the surface of the window, resulting in poor appearance of the window.

Further, when the surface of the window portion is hard-coated, the adhesive force between the window portion and the window frame portion is reduced. Therefore, before the window frame portion is injection-molded, it is joined to the window frame portion. A method is employed in which the hard coat treatment agent is scraped off from the surface of the window portion at the portion to be exposed to expose the thermoplastic resin of the window portion. However, such processing has a problem that it takes time and productivity is poor, and the window is damaged. There is also a method of treating the surface of the window portion, which is joined to the window frame portion, with a primer having a special composition, but such a primer is expensive. Furthermore, since the number of window manufacturing processes is large, the productivity is poor and the cost is high.

Therefore, a first object of the present invention is to mount a window portion in a window frame molding die during molding of the window frame portion, and then
It is an object of the present invention to provide a synthetic resin window in which the window portion is not deformed by the molding pressure when the thermoplastic resin is injection molded, and a molding method thereof. A second object of the present invention is to provide a synthetic resin window that does not require a surface treatment process for the window portion and is excellent in appearance quality, and a molding method thereof.

[0008]

The synthetic resin window of the present invention comprises a window portion made of a thermoplastic resin and a window frame portion made of a thermoplastic resin and covering the outer peripheral portion of the window portion.
In order to achieve the above-mentioned first object, the window portion and the window frame portion are integrated with each other, and the outer peripheral portion of the window portion is provided with a protrusion protruding from the surface thereof.

In order to achieve the above-mentioned first object, the method for molding a synthetic resin window of the present invention in which the window portion and the window frame portion are integrated is composed of (a) a thermoplastic resin and has an outer periphery. The step of molding the window part having the protrusion protruding from the surface of the part by the injection molding method, and (b) the window frame part which is made of a thermoplastic resin and covers the outer peripheral part of the window part is molded by the injection molding method. Molding process,
It is characterized by consisting of.

The protrusions have a boss or rib shape, and the distance between the protrusions is 5 to 100 mm, preferably 10 to 80 m.
It is desirable that it is m. Here, the interval means a surface interval (a gap between the protrusions). Spacing is 5
If it is less than mm, the flow of the molten thermoplastic resin for molding the window frame part may be obstructed by the protrusion when molding the window frame part. Further, if the distance exceeds 100 mm, the strength of the window becomes insufficient, and the window may be deformed when the window frame is molded. Increase the spacing between the protrusions on the outer periphery of the window corresponding to the vicinity of the gate of the window frame molding die, and increase the spacing between the protrusions on the outer periphery of the window corresponding to the position away from the gate. It is desirable to make the width narrow from the viewpoint of the flow state of the molten thermoplastic resin for molding the window frame portion.

The shape of the protruding portion is not particularly limited, but in the case of a cylindrical boss shape, for example, it is desirable that the outer diameter be equal to or less than the thickness of the window frame portion. For example, the outer diameter of the protrusion is 2 to 5 mm
The degree. The height of the protruding portion is set to a height at which the window portion comes into contact with the surface of the die cavity when the window portion is attached to the die for forming the window frame portion or a height lower than that. Alternatively,
The height may be such that the protrusions are crushed and crushed by the surface of the mold cavity when the window is mounted on the mold for forming the window frame.

The projection may be completely covered by the window frame, but the top may not be covered by the window frame. In the latter case, it is desirable to provide the protrusion at a position where the protrusion cannot be seen when the synthetic resin window is attached. The protrusions can be provided on both sides of the outer periphery of the window, but for example, in the case of a vehicle window, the appearance will be poor if it appears on the front side. It is preferable to make it inconspicuous.

By increasing the number of protrusions as much as possible, the deformation of the window can be suppressed when the window frame is molded. However, the sectional shape and height of the protrusion and the molding of the window frame can be suppressed. It is necessary to make a proper selection in consideration of the fluid state of the molten thermoplastic resin.

In order to achieve the above second object, in the synthetic resin window of the present invention, it is desirable that a synthetic resin sheet is laminated on at least one surface of the window portion. Alternatively, a first synthetic resin sheet whose surface is hard-coated is laminated on one surface of the window portion,
On the other surface of the window part, a second synthetic resin sheet provided with at least one function of antifogging property, antiglare property, infrared ray reflecting property and antifog property by enclosing heat rays is laminated. Is desirable.

In order to achieve the above second object, in the method of molding a synthetic resin window of the present invention, the thermoplastic resin melted on at least one synthetic resin sheet at the time of injection molding of the window portion. It is desirable to inject and to laminate a synthetic resin sheet on at least one surface of the window. Alternatively, at the time of injection molding of the window portion, at least one of the first synthetic resin sheet whose surface is hard-coated and anti-fog property, anti-glare property, infrared reflectivity, and anti-fog property due to encapsulation of heat rays.
It is desirable to inject the molten thermoplastic resin between the second synthetic resin sheet having various functions and to laminate the first and second synthetic resin sheets on both sides of the window.
Such a technique is an application of the CFI technique in which a sheet is mounted in a mold and a molten resin is injection-molded on the sheet to be integrally molded. In order to impart antifogging property, for example, Japanese Patent Laid-Open No.
The method described in 0-250927 can be mentioned. To impart the antiglare property, for example, Japanese Patent Laid-Open No.
The method described in 0-253518 can be mentioned. In order to impart infrared reflectivity, for example, the method described in JP-A-60-253519 can be mentioned. The heating wire can be formed on the surface of the synthetic resin sheet by printing a conductive paint on the synthetic resin sheet by a screen printing method, for example.

The thermoplastic resin (hereinafter referred to as the first
(Also called thermoplastic resin), PC (polycarbonate), PET (polyethylene terephthalate), PVC
(Polyvinyl chloride), PMMA (acrylic resin), M
A transparent thermoplastic resin such as S (methacrylate styrene) may be mentioned, but polycarbonate is preferable in view of impact resistance.

Examples of the thermoplastic resin (hereinafter, also referred to as the second thermoplastic resin) forming the window frame portion include soft polyvinyl chloride (PVC), urethane composition and elastomer composition. Any resin can be used as long as it functions as a cushioning material for the vehicle body and the window to which the window is attached.

Further, the second thermoplastic resin forming the window frame portion is required to have a function of integrating the window portion and the window frame portion.
When the second thermoplastic resin is not welded to the first thermoplastic resin used for molding the window portion, a primer treatment is applied to the outer peripheral portion of the window portion during injection molding of the window frame portion. The window part and the window frame part can be integrated. It should be noted that it is preferable to select, as the primer, a primer composed of a composition and a solvent having a low stress cracking property with respect to the first and second thermoplastic resins.

The synthetic resin sheet is made of PC (polycarbonate), PET (polyethylene terephthalate), PV
C (polyvinyl chloride), PMMA (acrylic resin),
Although it can be formed from a transparent thermoplastic resin such as MS (methacrylate styrene), polycarbonate is preferable in view of impact resistance. The thickness of the synthetic resin sheet is not particularly limited, but a thickness of 0.1 mm to 2.0 mm is preferable in consideration of the appearance of the window and the formability.

As the surface treatment of the synthetic resin sheet, for the synthetic resin sheet laminated on the side exposed to the outside air of the window portion, there is a weather-resistant silicone-based or acrylic resin containing an ultraviolet absorber. It is desirable to apply a system surface treatment agent. A synthetic resin sheet laminated on the side of the window that is not exposed to the outside air is preferably coated with a printable acrylic or urethane surface treatment agent that has some weather resistance and is printable. Since such a surface treatment can be performed on the flat synthetic resin sheet, the surface treatment liquid can be uniformly applied to the surface of the synthetic resin sheet, and a poor appearance does not occur. Printing may be performed on the front surface or the back surface of the synthetic resin sheet.

First synthetic resin sheet and window portion
The synthetic resin sheet is laminated on the surface of the window by welding with the thermoplastic resin. For example, when the first thermoplastic resin is polycarbonate, there is a polycarbonate sheet as a synthetic resin sheet that is weldable to the polycarbonate. Generally, when the first thermoplastic resin and the synthetic resin sheet have substantially the same composition, they can be easily bonded. When it is difficult for the first thermoplastic resin and the synthetic resin sheet to adhere to each other, the synthetic resin sheet can be laminated on the surface of the window portion by forming or applying the adhesive layer on the synthetic resin sheet. . For example, PMMA on a synthetic resin sheet made of polycarbonate
After laminating the film, P as the first thermoplastic resin
PMMA is a synthetic resin sheet that uses MMA.
By injection molding on the film side, the synthetic resin sheet can be laminated on the surface of the window portion.

The synthetic resin sheet may be laminated only on a portion other than the outer peripheral portion of the window portion, or may be extended to the outer peripheral portion of the window portion. That is, the synthetic resin sheet may or may not be present at the interface between the window portion and the window frame portion.

When injecting the first thermoplastic resin to mold the window portion, the first thermoplastic resin is added to the window portion so that parts for mounting the window (for example, bolts and screws) are embedded in the window portion. It is also possible to inject into the mold cavity. Parts for mounting windows are not limited to bolts and screws. The material for the window mounting component may be various materials such as metal and plastic. In the case of plastic, the melting temperature is equal to or higher than the melting temperature of the second thermoplastic resin for molding the window frame. It must have heat resistance.

[0024]

In the present invention, since the outer peripheral portion of the window portion is provided with the protruding portion protruding from the surface thereof, the outer peripheral portion of the window portion is reinforced, and the window frame portion covering the outer peripheral portion of the window portion is formed by the injection molding method. It is possible to prevent the window portion from being deformed by the injection pressure of the second thermoplastic resin during the molding. Therefore, during injection molding of the window frame portion, the flow of the second thermoplastic resin in the window frame portion molding die is not disturbed by the deformation of the window portion. If a synthetic resin sheet is laminated on at least one surface of the window,
The surface treatment of the window is unnecessary.

[0025]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described based on embodiments with reference to the drawings.

(Embodiment 1) A schematic sectional view of a synthetic resin window 1 of the present invention is shown in FIG. Window 1 is window part 1
0 and the window frame portion 20. A projecting portion 14 is provided on the outer peripheral portion 12 of the window portion 10. FIG. 1B shows a perspective view of the window portion 10 in the synthetic resin window of the present invention. The external shape of the window in Example 1 is a rounded triangle, and the length of each side is 55 cm, 42 cm, and 20 cm. The window has a thickness of 3 mm. Note that the window frame portion actually has a cross-sectional shape complementary to the shape of the portion of the vehicle or the like to which the window is to be attached.

The shape of the protrusion 14 is a cylindrical boss,
The outer diameter was 2 mm and the height was 2 to 4 mm. Further, 30 protrusions 14 are provided on the outer peripheral portion 12 of the window. Protrusion 14
Is 80 mm in the outer peripheral portion of the window portion corresponding to the vicinity of the gate portion of the mold for molding the window frame portion, and is 15 m in the outer peripheral portion of the window portion corresponding to the position farthest from the gate portion.
m. In addition, the outer peripheral portion in the middle is 40 mm. In FIG. 1B, the positions corresponding to the gates of the window molding die and the window frame molding die are indicated by arrows.

The synthetic resin window 1 of the present invention can be formed by the steps described below.

Polycarbonate resin material as a thermoplastic resin (trade name: Iupilon M, manufactured by Mitsubishi Gas Chemical Co., Inc.)
L300) was used. Thermoplastic resin was injected into the cavity of the window molding die under conditions of a resin temperature of 285 ° C., a die temperature of 60 ° C., and an injection pressure (gauge pressure) of 1600 kgf / cm ² . As a result, the window portion 10 having the plurality of protrusions 14 on the outer peripheral portion 12 was formed.

Next, the outer peripheral portion 12 of the window portion 10 and the protruding portion 1
4 is coated with a primer if necessary, and then the window 10
Was mounted in the window frame molding die 30 as shown in the schematic sectional view of FIG. In the figure, 32 is a runner portion and 34 is a window fixing plate. A cavity 38 for molding the window frame portion is provided in a window frame portion molding die portion corresponding to the periphery of the outer peripheral portion 12 of the window portion 10. It is desirable to dispose an elastic body 36 made of silicone rubber between the surface of the window portion and the window frame molding die 30 so as not to scratch the surface of the window portion. When injecting the molten thermoplastic resin for molding the window frame portion, it is desirable to make the injection pressure as low as possible from the viewpoint of preventing deformation of the window portion.
Therefore, it is preferable to increase the gate diameter of the window frame molding die 30. Further, it is preferable that the number of gates is small in order to reduce the number of weld lines.

Next, a thermoplastic resin made of polyvinyl chloride resin (manufactured by Riken Vinyl Industry Co., Ltd., trade name: TN8533) was applied at a resin temperature of 190 ° C., a mold temperature of 60 ° C., and an injection pressure (gauge pressure) of 600 kgf / cm ^2. Under the conditions described above, the synthetic resin window 1 in which the window frame portion 20 and the window portion 10 are integrated is injected by being injected into the cavity 38 of the window frame portion molding die 30 via the runner portion 32. Obtained.

This window has an excellent surface appearance, the window frame portion 20 and the window portion 10 are completely adhered, and the adhesive strength is 20 kg / c.
It was more than m ² , and the window frame part could not be peeled off from the window part by hand. The integrated window portion was not deformed even under the molding pressure of polyvinyl chloride resin.

(Embodiment 2) Window portion 10A in Embodiment 2
As shown in the schematic cross-sectional view of FIG. 3, the outer peripheral portion 12 of the window portion 10A is provided with a protruding portion 14 protruding from its surface, and the first portion is formed on both surfaces of the window portion 10A having a thickness of 3 mm. And the second synthetic resin sheets 16 and 18 are laminated. The first synthetic resin sheet 16 (exterior side) is made of a 0.5 mm polycarbonate sheet, and the surface thereof is hard-coated. The second synthetic resin sheet 18 (inside the interior) is also made of a 0.5 mm polycarbonate sheet, and has been subjected to anti-fogging treatment. First and second
The sizes of the synthetic resin sheets 16 and 18 were such that the surface of the window portion other than the outer peripheral portion of the window portion was covered. A window fitting (not shown) is attached to the window portion 10A.

This window portion 10A can be formed by the following method. That is, the first and second synthetic resin sheets 16 and 18 were mounted in the cavity of the window molding mold so that the surfaces treated were in contact with the mold surface. Further, a window mounting metal fitting (not shown) was attached to a predetermined position of the mold. A polycarbonate resin material (trade name: Iupilon ML300, manufactured by Mitsubishi Gas Chemical Co., Inc.) was used as the thermoplastic resin. Under the conditions of a resin temperature of 285 ° C., a mold temperature of 60 ° C., and an injection pressure (gauge pressure) of 1600 kgf / cm ² , the molten thermoplastic resin was mixed with the first synthetic resin sheet and the second synthetic resin sheet. It was injected in between and the first and second synthetic resin sheets 16 and 18 were laminated on both surfaces of the window 10A. As a result, the window portion 10A is molded, and the first and second windows are formed by the heat and pressure during injection molding of the thermoplastic resin.
It was possible to integrate the synthetic resin sheets 16 and 18 or the window fittings with the window portion 10A.

Next, the window portion 10A made of thermoplastic resin is used.
The window frame portion 20 that covers the outer peripheral portion 12 is molded by an injection molding method. This step can be the same as in Example 1, and detailed description thereof will be omitted.

This window had an excellent surface appearance, the surface of the window portion had scratch resistance and weather resistance, and the back surface had an antifogging effect and high functionality. The window frame portion and the window portion were completely adhered, the adhesive strength was 20 kg / cm ² or more, and the window frame portion could not be peeled off from the window portion by hand. The integrated window portion was not deformed even under the molding pressure of polyvinyl chloride resin. Further, the window mounting metal fitting is attached to the window, so that the window can be easily attached. The weight of the window was about half that of a window made of inorganic glass.

(Comparative Example) The same method, conditions and the same as in Example 1
A window made of synthetic resin was formed from raw materials. Comparative Example is Example 1
The difference is that no protrusion is provided on the outer peripheral portion of the window. When the molded window was observed, the window portion was deformed and the appearance was poor. Further, due to this deformation, the flow of the molten resin in the window frame molding die is deteriorated when the window frame is molded, and the window frame is not molded on a part of the outer peripheral portion of the window.

After molding the window portion, a silicon-based hard coat treatment liquid was applied to the surface of the window portion for the hard coat treatment. However, the hard coat treatment liquid was not formed because the window portion had a curved portion. It was applied uniformly and was not satisfactory in appearance. Further, since the hard coat treatment agent is present at the interface between the window frame portions and the window portions, the adhesiveness between the window frame portions and the window portions is poor, and the window frame portion can be easily peeled from the window portion by hand.

Although the present invention has been described based on the preferred embodiments, the present invention is not limited to these embodiments. The molding conditions, the materials used, the shapes and dimensions of the windows, protrusions and the like are examples, and can be appropriately changed. The protrusion may have a rib shape, as shown in the schematic plan view of the window in FIG. The cross-sectional shape of the window frame portion in the thickness direction may be symmetrical or asymmetrical with respect to the window portion, and may be designed depending on the shape of the portion of the vehicle or the like to which the window is attached.

[0040]

According to the present invention, it is possible to obtain a synthetic resin window which is capable of preventing the deformation of the window portion and which is excellent in appearance quality. Further, the surface treatment process of the window can be eliminated. Therefore, the manufacturing cost of the window can be reduced by reducing the number of processes, and the mass productivity is excellent. When the window of the present invention is applied to a vehicle window, the degree of freedom in window design is increased, and since the window is made of synthetic resin, it can be expected to reduce fuel consumption due to weight reduction and improve safety.

[Brief description of drawings]

FIG. 1 is a diagram schematically illustrating a window according to a first exemplary embodiment.

FIG. 2 is a conceptual diagram showing a state in which a window portion is mounted on a window frame portion molding die.

FIG. 3 is a diagram schematically showing a window of Example 2.

FIG. 4 is a schematic plan view of a window for showing the shape of a protrusion.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Window 10,10A Window part 12 Outer peripheral part of window part 14 Protrusion part 16,18 Synthetic resin sheet 20 Window frame part 30 Mold 32 Runner part 34 Window part fixing plate 36 Elastic body 38 Cavity

Front page continuation (72) Inventor Katsumi Yoshida 5-6-2 Higashi-Hachiman, Hiratsuka-shi, Kanagawa Sanryo Gas Chemical Co., Ltd. Plastics Center (72) Inventor Hisashi Tahara 5-6-2, Higashi-Hachiman, Hiratsuka-shi, Kanagawa No. Sanryo Gas Chemical Co., Ltd. Plastics Center (72) Inventor Yoshio Hosaka 1 Asahi, Taketoyo-cho, Chita-gun, Aichi Prefecture Asahi Glass Co., Ltd. (72) Inventor Takayuki Ito 1 Asahi, Taketoyo-cho, Chita-gun, Aichi Prefecture Address Asahi Glass Co., Ltd. Inside the company

Claims (8)

[Claims] 1. A synthetic resin window comprising a window portion made of a thermoplastic resin and a window frame portion made of a thermoplastic resin and covering an outer peripheral portion of the window portion, the window portion and the window frame portion. The window is made of synthetic resin, and is provided with a protrusion protruding from the surface on the outer periphery of the window. 2. The synthetic resin window according to claim 1, wherein the protrusion has a boss or rib shape, and the interval between the protrusions is 10 to 80 mm. 3. The synthetic resin window according to claim 1, wherein a synthetic resin sheet is laminated on at least one surface of the window portion. 4. A first synthetic resin sheet, the surface of which is hard-coated, is laminated on one surface of the window portion, and the other surface of the window portion is antifogging, antiglare and infrared. The synthetic resin sheet according to claim 1 or 2, wherein a second synthetic resin sheet provided with at least one function of reflection and fogging prevention by enclosing heat rays is laminated. Windows. 5. A step of molding a window portion made of a thermoplastic resin and having a protrusion protruding from the surface of the outer peripheral portion by an injection molding method, and (b) a window made of a thermoplastic resin. Forming a window frame part that covers the outer peripheral part of the window part by an injection molding method, and molding the synthetic resin window in which the window part and the window frame part are integrated. 6. The method for molding a window made of synthetic resin according to claim 5, wherein the protrusion has a boss or rib shape, and the interval between the protrusions is 10 to 80 mm. 7. A synthetic resin sheet is laminated on at least one surface of the window portion by injecting a molten thermoplastic resin onto at least one synthetic resin sheet during injection molding of the window portion. 7. The method for molding a synthetic resin window according to claim 5 or 6. 8. A first synthetic resin sheet, the surface of which is hard-coated at the time of injection molding of a window portion, an antifogging property, an antiglare property,
A molten thermoplastic resin is injected between the second synthetic resin sheet provided with at least one function of infrared reflectivity and fogging prevention by enclosing heat rays, and the first and The method for molding a synthetic resin window according to claim 5 or 6, wherein a second synthetic resin sheet is laminated.