JPH11179733A - Device for rolling in terminal part of skin material of multilayer molding and rolling-in method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable forming of multilayers with a presentable appearance by thermally melting the back face of a crowded-out skin material terminal part, then rolling the skin material terminal part with the molten back face into the back face side of a base material and pressing the back face of the rolled-in skin material terminal part into contact with the back face of the base material. SOLUTION: After melting the back face of a skin material terminal part 3, a rod 10 for a pressure contact tip is caused to advance by an air cylinder 12 and a sliding block moves forward as far as the advance stroke limits of the pressure contact tip 9 beyond the tip part of the outer peripheral part of a base material 2 provided at the tip part. In this case, the pressure contact tip 9 passes through the upper part of the end part of the base material 2, bending the skin material 3, and the skin material 3 is folded into the inside direction from the upper end of the base material 2. After that, a guide pin 18 makes headway along a groove formed in a guide 11 by moving the rod 10 farther forward, and the pressure contact tip 9 changes its direction downward in the neighborhood of a connecting pin 17 to the rod 10, folding the skin material to the back face side. Thus the pressure contact tip 9 rolls the skin material into the back face side of the base material 2 under a contact pressure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device and a device for winding a terminal portion of a skin material protruding from an outer peripheral portion of a base material of a multilayer molded product in which a skin material is laminated on a base material made of a thermoplastic resin, on the back surface of the base material. It is about the method.

[0002]

2. Description of the Related Art From a multilayer molded product in which a skin material is laminated on a base material made of a thermoplastic resin, a skin material terminal portion protruding from an outer peripheral portion of the base material is wound around the back surface of the base material to form a multi-layer molding having a good appearance. As a method of forming the product, a method using an adhesive and a method using a tucker are generally used. In the method using an adhesive, an adhesive is applied to one or both of the back surface of the skin material terminal portion and the back surface of the base material protruding from the outer peripheral portion of the base material, and the skin material terminal portion is bent toward the back surface side of the base material to bond the back surfaces together. The method of bonding is generally used, and in the method using a tucker, the end portion of the skin material protruding from the outer peripheral portion of the base material is bent toward the back surface of the base material, and the back surfaces are joined together and the tucker is driven in with an air gun or the like, and the end portion of the skin material is applied. Was fixed to the substrate.

However, in these methods, for example, the method using an adhesive takes a long time to bond the skin material end portion and the base material, which leads to cycle up.
There were problems such as the effect on the human body and the environment due to the use of the solvent.
In addition, the method using the tucker requires a long working time, insufficient finishing of the corners, protrusion of the pin to the product surface due to unevenness of the driving depth of the tucker, and peeling of the skin material terminal from the back of the base material due to insufficient fixing force. And so on.

[0004]

SUMMARY OF THE INVENTION
The present inventors have solved the above problems, and can cause the skin material terminal portion to be wound on the back side of the base material in a short time and with a simple operation without causing an environmental problem due to the use of a solvent or the like. By firmly joining the end part to the back of the base material,
As a result of a study on a method of winding a skin material terminal portion capable of obtaining a multilayer molded product having a good appearance and a device therefor, the present invention has been achieved.

[0005]

That is, the present invention relates to a multi-layer molded product in which a skin material is laminated on a base material made of a thermoplastic resin, and a skin material terminal portion protruding from the outer periphery of the base material is wound around the back surface of the base material. A device for heating and melting the back surface of the protruding skin material terminal portion, a means for winding the skin material terminal portion having the back surface heated and melted on the back surface side of the base material, and the wound skin material terminal portion. It is an object of the present invention to provide a skin material terminal winding device for a multilayer molded product, characterized by having a means for pressing the back surface to the back surface of the base material. (1) a step of heating and melting the back surface of a skin material terminal portion protruding from the base material outer peripheral portion, and (2) a heating and melting of the skin material terminal portion in a multilayer molded product of a skin material sticking out of an outer peripheral portion of the material. Rolling the backside of the base material,
(3) A method of winding the skin material terminal of a multilayer molded product, comprising a step of pressing the back surface of the wound skin material terminal portion to the back surface of the base material and performing a fusion bonding.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the drawings. This description is an example of the present invention, and it goes without saying that the present invention is not limited to this. FIG. 1 shows an example of a multilayer molded product to be subjected to terminal winding, in which a multilayer molded product in which a skin material is laminated on a substrate made of a thermoplastic resin is shown from the surface material side. Skin material protruding from the outer periphery (skin material terminal part)
Is trimmed in the state that it protrudes by the amount of the winding.
FIG. 2 similarly shows the state after the skin material terminal portion of the multilayer molded article of FIG. 1 is wound on the back surface of the base material, from the skin material side.

[0007] The terminal winding device (5) of the present invention is based on means for heating and melting the back surface of the skin material (3) protruding from the outer periphery of the base material (2). Means for winding on the back side of the material, and means for crimping the back surface of the wound skin material terminal portion to the back surface of the base material. The surface material side of the outer peripheral portion to be terminal-treated of the multilayer molded product of the skin material sticking out of the outer peripheral portion of the base material made of resin is set on the molded product fixing table (4) designed so as to follow this, Used together. FIG. 3 shows a multilayer molded product to be processed having a skin material protruding from the outer peripheral portion of the base material (1).
FIG. 9 is a partial cross-sectional view showing a state where the terminal winding device (5) is integrally set on the molded article fixing stand (4) on which is set.

If the multilayer molded product (1) to be subjected to terminal treatment has a deformation or the like, the molded product to be processed cannot be completely adhered to the molded product fixing table (4), so that it is deformed from the rear surface of the molded product. It is preferable that the molded article is pressed against the fixed base with a holding jig (not shown) which also serves as a correction of the above, and is brought into close contact with the fixed base so that at least the surface material side of the outer peripheral portion of the molded article to be subjected to terminal treatment is along. When the skin material protruding from the outer periphery of the base material falls down, the skin material is pressed against the terminal winding device (5) using air or the like as shown in FIG. 8, for example. Is preferred.

[0009] A method of winding the skin material protruding from the outer periphery of the base material using the terminal winding device (5) shown in Fig. 3 will be described. FIG. 3 shows a molded product fixing stand (4) on which a multilayer molded product (1) to be processed having a skin material (3) on the outer peripheral portion of the substrate (2) is set as described above. The state where the terminal winding device (5) is set integrally is shown. FIG. 4 shows an air cylinder (8) provided with an air cylinder bracket (13) having a built-in heater and controlled at a predetermined temperature.
3 shows a state in which the heating tip (6) is rotated downward from the state shown in FIG. 3 via the heating tip arm (7), and the heating tip (6) is pressed against or brought close to the back surface of the skin material. ing. At this time, in order to reliably melt the back surface of the skin material in a short time, the front end of the crimping tip (9) provided rotatably by the guide pin (18) at the front end of the slide guide (15) is used. It is preferable that the skin material is sandwiched between the heating tip (6) and the pressure-bonding tip (9) by pressing from the surface side. In order to press the crimping tip (9) against the surface of the skin material, for example, as shown in FIG. 9, the crimping tip (9) is connected to a crimping tip rod (10) connected to a slide guide (15) via a connecting pin (17). The slide guide (15) is advanced by using a spring (21) or the like provided at the rear end of the slide guide to release the air from the air cylinder (12), thereby bringing the slide guide into a neutral state. The tip of the crimping tip (9) can be pressed against the tip of the skin material terminal.

In the melting of the back surface of the skin material, it is not necessary that the portion to be melted is only the back surface in a strict sense.
Depending on the type of the skin material, the surface of the protruding skin material part may be partially molten, and in a multilayer molded product after the winding process, the appearance is not impaired at the corner portion after the winding process. May be melted. After melting the back surface of the skin material terminal (3), the heating tip (6) is air-cylinder-heated.
By (8), it rotates upward through the heating chip arm (7) and returns to the initial position as shown in FIG.

After the heating chip (6) returns to the initial state,
When the air cylinder (12) is operated to advance the crimping tip rod (10), the connecting pin (17)
The slide block (15) connected to the end of the slide block (15) extends beyond the distal end of the outer peripheral portion of the base material provided at the distal end of the slide block (15) to the forward stroke limit of the pressure-bonding tip (9). Advance. In this advancing process, the crimping tip (9) passes over the upper end of the base material while bending the skin material, and the skin material is folded inward from the upper end of the base material. (Fig. 5) The forward stroke limit at this time is
The thickness of the base material and the skin material, the type, and the like are adjusted in advance by a screw adjusting screw (19).

When the rod (10) further advances after the crimping tip (9) reaches the forward stroke limit, the guide pin (18) advances along a groove provided in the guide (11), and the crimping is performed. The tip (9) is turned downward in the vicinity of the connecting pin (17) to the rod (10), and the skin material is folded on the back side of the base material, and then pressed and wound. (FIG. 6)
At this time, the air cylinder (12) is supported by the support pin (1).
6) and the connecting pin (17) of the rod (10), even when the crimping tip (9) moves obliquely upward along the groove of the guide (11), the air-cylinder (12) can be used. ) Is rotated by the support pin (16) so that the rod (10) side can be operated to lift.

When the winding is completed, the rod (10) and the slide guide (15) are retracted to return the crimping tip (9) to the initial position, and the terminal winding operation is completed. (FIG. 7)

Here, the set temperature of the heating tip (6), the pressing time to the back surface of the skin material and the crimping time with the crimping tip (9) vary depending on the material and thickness of the skin material to be used. To ensure that the skin material is wound around the back surface of the base material as short as possible, it is preferable to increase the set temperature. For example, in the case of a skin material lined with a polypropylene foam having a foaming ratio of 15 times and a thickness of 3 mm, the set temperature of the heating tip (6) is 220 ° C. or more, especially 240 ° C.
It is preferable that the temperature is not lower than ° C. When a thin sheet alone such as a polypropylene elastomer sheet is used, care must be taken because if the heating temperature is too high, the skin material will be broken. Furthermore, if the time until the back surface of the skin material is melted by the heating tip (6) and then pressed by the pressure bonding tip (9) becomes long, the melted portion solidifies and may not be welded even if the skin material is pressed against the base material. Therefore, it is necessary to make the time as short as possible.

It is necessary to select the material of the crimping tip (9) according to the type of the skin material. For example, a resilient skin material such as a polypropylene foam may be made of a material having a high hardness such as a metal. In the case of a thin skin material such as a polypropylene elastomer sheet alone without a material, it is preferable to use a resilient material for the pressing portion of the pressure-bonding tip to completely adhere the skin material and the base material. Also,
In order to press and fuse the skin material to the back surface of the base material with the crimping tip (9), it may not be possible to completely weld without pressing the crimping tip (9) and cooling at the same time. For this reason, a material having good thermal conductivity is more preferable.

Although the operation example of the terminal winding device has been described above, such a terminal winding device can be used in accordance with the size of the multilayer molded article to be processed, the state of bonding of the skin material, and the like.
For example, the size of the heating tip or the crimping tip may be changed or a plurality of them may be used, or a terminal winding device having a different size may be used in combination depending on the situation. For example, when the skin material is wound around the entire outer peripheral portion of the multilayer molded product, a plurality of terminal winding devices are used so as to surround the entire circumference (FIG. 10), or the multilayer material to be processed is used. In the case where the outer peripheral portion of the molded product includes a linear portion, the number of terminal winding devices to be arranged can be reduced by increasing the size of the heating tip and the crimping tip in the linear portion (FIG. 11).

In addition, a terminal molding device having a small shape of a heating chip or a pressure-bonding chip is finely arranged in a corner portion or a complicated shape portion to perform a terminal treatment, thereby obtaining a multilayer molded product having a good appearance. be able to. It is preferable to shift the timing of the winding operation of such a corner part or the like so that the terminal winding devices do not interfere with each other. When such a large number of terminal entanglement devices are used, control may be performed by a series of sequence corners, and the timing and time of each operation may be arbitrarily set by a timer.

In a multilayer molded product to which terminal treatment can be applied in such a terminal winding device, as a base resin constituting the molded product, resins usually used in compression molding, injection molding, extrusion molding, etc., for example, polypropylene, polyethylene,
General thermoplastic resin such as acrylonitrile-styrene-butadiene block copolymer, polystyrene, polyamide such as nylon, polyvinyl chloride, polycarbonate, acrylic resin, styrene-butadiene block copolymer, and thermoplastic elastomer such as EPM and EPDM And a mixture thereof, or a polymer alloy using the same, and the like, and these may be non-foamable or foamable. In addition, these thermoplastic resins may contain a glass fiber, which is usually used, if necessary, a filler such as various inorganic or organic fillers,
Of course, various additives such as various commonly used pigments, lubricants, antistatic agents, stabilizers and the like may be blended.

As the skin material, a sheet or film of a thermoplastic resin or a thermoplastic elastomer which can be welded to a thermoplastic resin used as a base material, and a foamed sheet of a thermoplastic resin or a thermoplastic elastomer have been conventionally known. Various kinds of skin materials are applied, and the surface of these skin materials may be decorated with an uneven pattern such as a grain, printing, dyeing, or the like according to the purpose. Each of these skin materials is not limited to a single material, and may be a composite skin material obtained by laminating two or more kinds with an adhesive or the like. In particular, a polyvinyl chloride sheet using a foam sheet such as a polypropylene foam sheet as a backing material Thermoplastic elastomer sheets such as and EPDM are preferred.

[0020]

According to the terminal winding device of the present invention, the back surface of the skin material protruding from the base material of the multilayer molded product in which the skin material is laminated on the surface of the thermoplastic resin base material is melted by a heating chip, and the skin material is heated. Is rolled onto the back surface of the base material and pressed, and is firmly bonded to the base material by fusion, so that it is possible to obtain a multilayer molded product having excellent winding strength and good appearance.

[0021]

Next, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples.

Example 1 A terminal winding device shown in FIG. 3 was arranged and used as shown in FIG. 10 using a molded product in which a skin material protruded from the outer periphery of a base material having the shape shown in FIG. The terminal was wound by the method described in the text shown in FIG. 7 to FIG. 7 to obtain a multilayer molded product (automobile door panel) shown in FIG. The thermoplastic resin used as the base material in the molded product of the raw material is polypropylene (Sumitomo Noblen BT)
A51E-1: manufactured by Sumitomo Chemical Co., Ltd., and a skin material is a foamed polypropylene sheet having a thickness of 3 mm and an expansion ratio of 15 times (manufactured by Toray, PPS) on the back of a 0.6 mm thick vinyl chloride sheet.
M15030). At this time, the set temperature of the heater of the heating chip is 260 ° C.
Contact time between heating tip and back of skin material (heating melting time)
Was 10 seconds, and the pressing time by the pressure bonding tip was 10 seconds. There is no protruding skin material on the outer periphery of the obtained multilayer molded product, it is neatly folded into the inside of the base material, and the back surface of the skin material and the base material are firmly fused to each other. Was also good.

Example 2 A terminal was wound in the same manner as in Example 1 except that a multi-layer molded product having a shape shown in FIG. 1 in which the skin material was a polypropylene elastomer sheet having a thickness of 0.5 mm was used. Was obtained (automobile door panel). However,
At this time, the set temperature of the heater of the heating chip is 190
C., the heating and melting time was 10 seconds, and the pressing time by the pressure bonding tip was 10 seconds. There is no protruding skin material on the outer periphery of the obtained multilayer molded product, it is neatly folded into the inside of the base material, and the back surface of the skin material and the base material are firmly fused to each other. Was also good.

[Brief description of the drawings]

FIG. 1 is an example of a molded article having a skin material terminal portion protruding from an outer peripheral portion of a base material.

FIG. 2 is an example of a multilayer molded product obtained by terminating the molded product shown in FIG.

FIG. 3 is a schematic partial cross-sectional view showing an example of the terminal winding device of the present invention.

FIG. 4 is a schematic view showing a terminal winding process using the terminal winding device shown in FIG. 3;

FIG. 5 is a schematic diagram showing a terminal winding process using the terminal winding device shown in FIG. 3;

FIG. 6 is a schematic diagram showing a terminal winding process using the terminal winding device shown in FIG. 3;

FIG. 7 is a schematic view showing a terminal winding process using the terminal winding device shown in FIG. 3;

FIG. 8 is a view in which an air-blowing nozzle is added to the terminal winding device shown in FIG. 3;

FIG. 9 is a schematic cross-sectional view showing a portion provided with a spring for pressing the pressure-bonding tip against the skin material in the example of the terminal winding device of the present invention.

FIG. 10 shows an example in which a plurality of terminal winding devices are arranged on the outer peripheral portion of a molded product to be processed.

FIG. 11 shows an example in which a plurality of terminal winding devices are arranged on an outer peripheral portion of a molded product to be processed.

[Explanation of symbols]

 1: Multilayer molded product 2: Base material 3: Skin material 4: Molded product fixing base 5: Terminal winding device 6: Heating chip 7: Heating chip arm 8: Air cylinder for heating chip 9: Crimping chip 10: Crimping chip Rod 11: Crimping tip guide 12: Air cylinder for crimping tip 13: Air cylinder bracket 14: Air cylinder bracket 15: Slide guide 16: Cylinder-support pin 17: Crimping tip connecting pin 18: Guide pin 19: Stroke adjustment Screw 20: Air-blowing nozzle 21: Spring

Claims (2)

[Claims] 1. A device for winding a terminal portion of a skin material protruding from an outer peripheral portion of a base material of a multilayer molded product in which a skin material is laminated on a base material made of a thermoplastic resin to a back surface of the base material, wherein the protruding skin material is provided. Means for heating and melting the back surface of the terminal portion, means for winding the skin material terminal portion having the back surface heated and melted on the back surface side of the base material, and means for pressing the back surface of the wound skin material terminal portion on the back surface of the base material. A device for winding a skin material terminal portion of a multilayer molded product, comprising: 2. A multi-layer molded product having a skin material terminal portion protruding from an outer peripheral portion of a base material made of a thermoplastic resin, wherein (1) a back surface of the skin material terminal portion protruding from the base material outer peripheral portion. (2) a step of winding the heated and melted skin terminal portion on the back side of the base material, and (3) a pressure bonding of the rolled back surface of the skin material terminal portion to the back surface of the base material and fusion bonding. A method for winding a skin material terminal portion of a multilayer molded product, comprising the steps of: