JP2002283386A - Method for manufacturing composite molded object - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture a composite molded object comprising a plurality of thermoplastic resin members, high in the joining strength of the mutual end parts of the thermoplastic resin members and also excellent in appearance at low cost. SOLUTION: A thermoplastic resin sheet member is supplied to a part of the surface of the cavity between a pair of male and female molds and a molten thermoplastic resin is supplied to the cavity from the cavity where the sheet member is not present to fill the cavity to form a thermoplastic resin base material part, and the end part of the thermoplastic resin sheet member and the end part of the thermoplastic resin base material part are integrally joined to manufacture the composite molded object.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a composite molded article in which a base material made of a thermoplastic resin and a thermoplastic resin sheet member are integrally joined at their edges.

[0002]

2. Description of the Related Art Molded articles made of thermoplastic resins are widely used in automobile interior parts, interior and exterior parts of home electric appliances and other wide fields due to their economical efficiency and good shapeability.

As a molded article made of such a thermoplastic resin, a composite molded article in which a plurality of thermoplastic resin molded articles formed in advance are combined and their edges are joined together is known. Conventionally, as shown in FIG. 1, for example, molded articles made of a thermoplastic resin are each previously produced by injection molding or press molding, and thereafter, the edges of these molded articles are assembled with each other, and a means such as heat caulking is used. Was used to join them. (Fig. 2)

However, a composite molded article in which a plurality of molded articles made of such a thermoplastic resin are separately manufactured, and the end portions are assembled and joined in a later step, the production process is complicated, or the molded article is Misalignment occurs when joining each other,
There is a problem that heat is also applied to the surface during heat staking, resulting in poor appearance of the product surface.

[0005]

SUMMARY OF THE INVENTION
The present inventors have studied a method of manufacturing a composite molded product composed of a plurality of thermoplastic resin members at a low cost, which is a composite molded product composed of a plurality of thermoplastic resin members, having a high bonding strength between both ends, and an excellent appearance. The present invention has been reached.

[0006]

That is, according to the present invention, after a thermoplastic resin sheet member is supplied to a part of a cavity surface between a pair of male and female molds, a melt is formed in the cavity from the cavity where the sheet member does not exist. The thermoplastic resin is supplied and filled to form a thermoplastic resin base portion, and the end of the thermoplastic resin sheet member and the end of the thermoplastic resin base are joined and integrated. An object of the present invention is to provide a method for producing a composite molded article.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. This description is an example of the present invention, and the present invention is not limited to this.

The composite molded article produced according to the present invention comprises a thermoplastic resin base material (6) and a thermoplastic resin sheet member (7) in the same manner as conventionally known composite molded articles. As shown in FIG. 1, a plan view of the molded article (1) having a uniform shape is the same as a conventional composite molded article viewed from the surface side, but in the composite molded article manufactured by the present invention, FIG. FIG. 3 is a cross-sectional view taken along the line AA.
As shown in (a), the joint (F ′) between the thermoplastic resin base material (6) and the thermoplastic resin sheet member (7) is
The edge of the thermoplastic resin sheet member (7) and the edge of the thermoplastic resin substrate (6) are integrally joined. Further, as shown in FIG. 3 (b), an end of the thermoplastic resin sheet member (7) at a joint (F ′) between the thermoplastic resin substrate (6) and the thermoplastic resin sheet member (7). Are integrally joined so as to be surrounded by the thermoplastic resin constituting the base material.

This joint must be joined and integrated at the contact surface between the edges of the thermoplastic resin sheet member (7) and the thermoplastic resin substrate (6). The method may be heat fusion, or may be a form in which the thermoplastic resin base material (6) wraps around the thermoplastic resin non-foamed sheet member (7) and is physically joined. Also, the joining surface may be all or a part of the joining portion of the thermoplastic resin base material (6) and the base material (7) formed of the thermoplastic resin sheet member, and the joining strength may be sufficient. There is no particular limitation as long as the thermoplastic resin substrate (6) and the substrate (7) composed of a thermoplastic resin sheet member are joined to such an extent that there is no problem.

[0010] A skin material may be laminated on part or all of the surface of the thermoplastic resin substrate portion of the composite molded article produced according to the present invention. For example, FIG. 4A shows a plane viewed from the surface side of the composite molded product, and FIG. 4B shows FIG.
FIG. 5 (a) shows a form in which a skin material (8) is laminated on the entire surface of a thermoplastic resin base material (6) as shown in a cross section taken along the line CC in FIG. As shown in FIG. 5 (b), which is a cross section taken along line DD in FIG. 5 (a), a skin material (8) is laminated on a part of the surface of the thermoplastic resin base material (6). You may.

As shown in FIG. 6A, the surface of the thermoplastic resin sheet member (7) is covered with a skin material (8 ') as a cross section at the joint between the thermoplastic resin sheet member and the thermoplastic resin base material. Or a backing material (9) such as a reinforcing sheet may be laminated on the back surface of the thermoplastic resin sheet member as shown in FIG. 6 (b).

Further, on the back surface of the thermoplastic resin sheet member, ribs for improving the product strength and projections such as bosses for assembling with other parts may be integrally provided. The ribs and bosses may have ribs (10) formed over the entire length of the back surface of the thermoplastic resin sheet member (7) as shown in FIG.
Ribs (10) may be partially formed on the back surface of the thermoplastic resin sheet member (7) as shown in (b), and the arrangement of the ribs (10) as shown in FIG. 7 (c). The shape and shape are not particularly limited, and the size and number are also appropriately determined depending on the purpose of use.

Needless to say, such ribs and bosses are not limited to the thermoplastic resin sheet member, but may be provided on the thermoplastic resin base or on both.

In the composite molded article manufactured by the present invention, the ends of the thermoplastic resin base material (6) and the thermoplastic resin sheet member (7) as described in the above example are joined in abutting condition. In addition to the form, as shown in FIG. 8A, a form in which a thermoplastic resin base material (6) is sandwiched between thermoplastic resin sheet member base materials (7) may be used.
As shown in (b), the entire periphery of the thermoplastic resin sheet member (7) may be surrounded by a thermoplastic resin base material (6), and the thermoplastic resin base material (6) and the thermoplastic resin The arrangement of the sheet member (7) is not particularly limited, and may be a combination of a plurality of thermoplastic resins or a plurality of thermoplastic resin sheet members as appropriate.

Such a composite molded article is manufactured by the following method. FIG. 9 is a schematic sectional view of an example of a mold used in the method of the present invention. In this mold, the outer peripheral portion of the male mold (11) and the inner peripheral portion of the female mold (12) serve as sliding surfaces. And a male-female pair which slides on the male mold surface. The male molding surface has a holding body (1) for holding the edge of the thermoplastic resin sheet member.
3) having a fitting groove (14) for fitting therein and a molten resin supply port (1) through a molten resin supply passage (15).
6) is open. The molten resin supply port may be provided at a location corresponding to the thermoplastic resin substrate forming portion, and the number and arrangement thereof may be determined according to the product shape and size.

Next, a method of manufacturing the composite molded article shown in FIG. 1 using such a mold will be described. FIG.
(A) is a plan view schematically showing an example in which the edge of the thermoplastic resin sheet member (17) is sandwiched by a sandwiching body (13a). The sandwiching of the thermoplastic resin sheet member (17) only needs to be fixed so as not to cause displacement during molding. In this example, a portion sandwiching the edge of the thermoplastic resin sheet member and a portion not sandwiching the edge. Are shown alternately. That is, as shown in FIG. 10 (b), the GG portion of FIG. 10 (a) has the edge of the thermoplastic resin sheet member firmly held by the holding body (13a). As shown in FIG. 10C, the HH portion of a) does not directly hold the edge of the thermoplastic resin sheet member to the holding body (13a). The portion where the edge of the thermoplastic resin sheet member (17) shown in FIG. 10 (c) is not sandwiched is filled with the molten thermoplastic resin at the time of molding and becomes a thermoplastic resin at the time of forming a composite molded article after molding. The edge of the sheet member (17) corresponds to a portion to be joined to the thermoplastic resin base material (6), and if this portion is increased, the thermoplastic resin base material (6) and the thermoplastic resin sheet member ( 17), but there is a problem that the positioning property of the thermoplastic resin sheet member (17) is deteriorated. For this reason, it is preferable that the portion where the edge of the thermoplastic resin sheet member is firmly held by the holding body and the portion where the edge is not directly held are alternately and finely arranged.

At this time, the thermoplastic resin sheet member (17) sandwiched by the sandwiching body (13a) may be sandwiched as it is by the sandwiching body (13a). Is preferred. Further, a product shaped in advance into a product shape may be sandwiched. The holding body (13) is detachable from the fitting groove. The holding body is detached from the fitting groove and taken out. After the thermoplastic resin sheet member is previously held by the holding body as described above, It is common to fit in the fitting groove while maintaining the sandwiched state.

FIG. 11 shows a thermoplastic resin sheet member (17).
2 shows a state in which the holding body (13a) holding the holding member is fitted in the fitting groove (14) provided in the male mold (11). At this time, a clamp frame (not shown) or the like may be provided on the outer peripheral portion of the male mold (5) to fix the outer peripheral portion of the thermoplastic resin sheet member. FIG. 12 shows a state in which the thermoplastic resin sheet member (17) set between the molds does not exist and the molten resin supply port (16) provided in the male mold through the molten resin supply passage (15). The state which supplies the plastic resin (18) is shown. The number and arrangement of the molten resin supply ports (16) are appropriately determined depending on the shape and size of the product. Also,
The cavity clearance of the male and female molds when supplying the molten thermoplastic resin (18) is appropriately determined according to the appearance quality required for the product.

FIG. 13 shows a state in which the mold clamping has been completed. FIG. 13 (a) shows the portion where the thermoplastic resin sheet member (17) is sandwiched, and FIG. The figure shows a state in which the mold is clamped at a portion where the sheet member (17) is not sandwiched, and the molten thermoplastic resin enters into a gap of the portion where the thermoplastic resin sheet member (17) is not sandwiched, and is formed. The thermoplastic resin base material and the thermoplastic resin sheet member are firmly joined. The timing of the mold clamping may be either while supplying the molten thermoplastic resin (18) or after the supply is completed.
When the mold clamping is performed after the supply of the molten thermoplastic resin (18) is completed, the mold clamping is preferably started immediately after the supply of the molten thermoplastic resin is completed. Although the figure shows an example of the mold clamping of the male and female molds in the vertical direction, the mold clamping direction may be the vertical direction or the horizontal direction. Thereafter, the mixture is cooled and solidified, and the male and female molds are opened to take out a composite molded article in which a thermoplastic resin sheet member is firmly joined to a thermoplastic resin base material.

In this method, the thermoplastic resin base member and the thermoplastic resin sheet member can be similarly integrated when the thermoplastic resin sheet member is clamped by using the clamping body (13b) shown in FIG. . When this holding member is used, the mold clamping is completed after the supply of the molten thermoplastic resin (see FIG. 1).
In 5), the molten thermoplastic resin enters around the edge of the portion (FIG. 15 (b)) where the thermoplastic resin sheet member (17) is not sandwiched, and the thermoplastic resin base material is formed of the thermoplastic resin sheet member. The thermoplastic resin base member and the thermoplastic resin sheet member are firmly joined so as to surround the edge.

FIG. 16 shows an example of the production of a composite molded article in which ribs are provided on the back side of a thermoplastic resin sheet member. The mold used at this time has, in addition to the above-described mold example, a concave portion (19) for forming a rib or a boss in a part of the portion of the male mold covered by the thermoplastic resin sheet member. Also, a molten resin supply passage is connected to this concave portion so that the molten thermoplastic resin can be supplied from the molten resin supply port (20). An opening / closing valve (not shown) is provided at the molten resin supply port to supply a molten thermoplastic resin to a portion serving as a base material portion, and a molten thermoplastic resin is provided at a rib or a boss portion. Molten resin supply port (20)
However, it is preferable that the supply timing and the supply time of the molten resin can be independently adjusted. FIG. 17 shows that a molten thermoplastic resin is supplied from a molten resin supply port (20) through a molten resin supply passage to a concave portion (19) for forming a rib or a boss provided in a male mold, and a thermoplastic resin sheet member ( 1
The rib (10) is integrally formed on the back surface of (7) by thermal fusion. The timing of supplying the molten thermoplastic resin for forming the ribs and the bosses is preferably performed after the closing of the male and female molds is completed.

Next, a method for producing a composite molded article in which a skin material is bonded and integrated on the surface of a thermoplastic resin substrate will be described. FIG. 18 (a) shows a sandwich (13c) in which the skin material (8) and the edge of the thermoplastic resin sheet member (17) are overlapped.
FIG. 1 is a plan view schematically showing an example in which the sheet is sandwiched. The sandwiching between the skin material (8) and the thermoplastic resin sheet member (17) may be fixed so as not to cause displacement during molding. In this example, the skin material (8) and the thermoplastic resin sheet member (17) are used. Are shown in a state in which the portions sandwiched by overlapping the edges are alternately arranged. That is, as shown in FIG. 18 (b), the portion II of FIG. 18 (a) is formed by sandwiching the edges of the skin material (8) and the thermoplastic resin sheet member (17) with the sandwiching body (13c). 18 (a), the edges of the skin material (8) and the thermoplastic resin sheet member (17) are connected to each other as shown in FIG. 18 (c). Clamping body (13
c) is not directly clamped. This FIG.
The portion not sandwiching the edges of the skin material (8) and the thermoplastic resin sheet member (17) shown in (c) is melted into a gap around the edge of the thermoplastic resin sheet member (17) during molding. The edge of the thermoplastic resin sheet member (17) corresponds to the portion that is wrapped by the thermoplastic resin base material (6) when the thermoplastic resin enters and becomes a composite molded product after molding. By doing so, the bonding strength between the thermoplastic resin base material (6) and the thermoplastic resin sheet member (17) is increased, but the thermoplastic resin enters the surface of the thermoplastic resin sheet member (17), and the positioning property is reduced. There is a problem that it becomes worse. For this reason, it is preferable that the portion where the edges of the skin material and the thermoplastic resin sheet member are firmly held by the holding body and the portion where the edge is not directly held are alternately and finely arranged.

At this time, the thermoplastic resin sheet member (17) sandwiched by the sandwiching body (13c) may be sandwiched as it is by the sandwiching body (13c). Is preferred. Further, a product shaped in advance into a product shape may be sandwiched. As for the skin material (8), the skin material (8) may be sandwiched as it is, may be sandwiched in a pre-heated state, or may be sandwiched in a state of being shaped into a product in advance.

FIG. 19 shows a fitting groove (14) provided in the male mold (11) with a holding body (13c) in which the skin material (8) and the edge of the thermoplastic resin sheet member (17) are overlapped and held.
3 shows a state where the fitting is performed. At this time, male type (11)
A clamp frame (not shown) or the like may be provided on the outer peripheral portion of the cover member to fix the outer peripheral portion of the skin material and / or the thermoplastic resin sheet member. FIG. 20 shows a state where the molten thermoplastic resin is supplied from the molten resin supply port (16) between the skin material set between the molds and the male mold through the molten resin supply passage in the male mold. I have. The number and arrangement of the molten resin supply ports (16) are appropriately determined according to the shape and size of the product. However, when the skin material is bonded and integrated only to a part of the thermoplastic resin base material surface, at least It is necessary to arrange it in the place where the skin material exists. The cavity clearance of the male and female molds when supplying the molten thermoplastic resin (18) is appropriately determined depending on the type of the skin material used.

FIG. 21 shows a state where the mold clamping has been completed. FIG. 21 (a) shows a portion of the portion sandwiching the edges of the skin material (8) and the thermoplastic resin sheet member (17). FIG. 21B shows a state in which the skin material (8) and the thermoplastic resin sheet member (17) are clamped at portions where the edges are not sandwiched, and the skin material (8) and the thermoplastic resin A thermoplastic resin base material is formed so as to wrap around the edges of the skin material (8) and the thermoplastic resin sheet member (17) in a portion where the edge of the sheet member (17) is not sandwiched,
The thermoplastic resin base member and the thermoplastic resin sheet member are firmly joined. The timing of the mold clamping may be either while supplying the molten thermoplastic resin (18) or after the supply is completed. When the mold clamping is performed after the supply of the molten thermoplastic resin (18) is completed, the mold clamping is preferably started immediately after the completion of the supply of the molten thermoplastic resin. Thereafter, cooling and solidification are performed, and by opening both the male and female molds, a skin material is bonded and integrated on the surface of the thermoplastic resin base material, and the thermoplastic resin sheet member is firmly joined. The molding is removed.

The thermoplastic resin applied to the thermoplastic resin substrate of the present invention is a resin usually used in compression molding, injection molding, extrusion molding and the like, and is, for example, polypropylene, polyethylene, acrylonitrile styrene- General thermoplastic resin such as butadiene block copolymer, polyamide such as polystyrene and nylon, polyvinyl chloride, polycarbonate, acrylic resin, styrene butadiene block copolymer, EPM and EPDM
And the like, a mixture thereof, and a polymer alloy using the same. These may be foamable or non-foamable. In addition, these thermoplastic resins may contain fillers such as commonly used glass fibers and various inorganic or organic fillers, if necessary.Of course, various pigments and lubricants that are commonly used, Various additives such as an antistatic agent and a stabilizer may be blended.

Examples of the skin material applicable to the present invention include fabrics and knits such as moquettes and tricots, nonwoven fabrics such as needle punched carpets, and sheets or films of metal foil, thermoplastic resin and thermoplastic elastomer. These skin materials may be two or three or more laminated skin materials in which a foam layer and a backing layer are appropriately laminated as necessary, but may be heat-fusible with a thermoplastic resin,
Alternatively, it is necessary that the back surface of the skin material is impregnated with a thermoplastic resin in a molten state and can be bonded to the base resin portion. In this case, the foamed layer may be a polyolefin foam such as polypropylene or polyethylene, a polyvinyl chloride foam, a soft or semi-rigid polyurethane foam, or the like.The backing layer may be a nonwoven fabric or a synthetic resin sheet or film. And the like. Natural fibers such as cotton, wool, silk and hemp or synthetic fibers such as polyamide, polyester and nylon can be used as the fibers constituting the nonwoven fabric.
These can be used alone or as a blend to form a nonwoven fabric by various methods. For example, needle punch type,
Thermal bond type, spun bond type, melt blow type,
Non-woven fabrics such as spunlace type are exemplified. Examples of the sheet or film made of a synthetic resin include thermoplastic resin such as polypropylene and polyethylene and sheets and films of a polyolefin-based thermoplastic elastomer, and those having a fusibility with the thermoplastic resin used as the base resin. Used.

As the thermoplastic resin applied as the thermoplastic resin sheet member of the present invention, the same thermoplastic resins as those exemplified as the thermoplastic resin substrate are applied, but the thermoplastic resin applied as the thermoplastic resin substrate is used. The same type of plastic resin that can be fused to each other is particularly preferably applicable.

The thermoplastic resin sheet member used in the present invention is non-foamed, and its thickness is not particularly limited.
About 10 to 10 mm can be preferably applied. Further, a surface material such as a nonwoven fabric may be laminated on the surface of the thermoplastic resin sheet member, or a sheet of reinforcing thermoplastic resin or thermoplastic elastomer may be laminated on the back surface.

As a molding method applied to the composite molded article of the present invention, when a skin material is bonded and integrated, compression molding which can reduce damage to the skin material can be preferably applied, as shown in FIG. After setting the thermoplastic resin sheet member in the mold as described above, the male and female molds may be closed as shown in FIG. 22, and then the molten thermoplastic resin may be supplied and shaped.

[0031]

According to the method of the present invention, even when the thermoplastic resin base material and the thermoplastic resin sheet member are integrally joined, the joining strength between the two ends is high, and furthermore, the misalignment occurs. , And a composite molded article having good appearance can be produced efficiently and at low cost.

[Brief description of the drawings]

FIG. 1 is a plan view showing an example of a composite molded product of the present invention.

FIG. 2 is a sectional view of a composite molded product according to the prior art.

FIG. 3 shows an example of an AA sectional view of the composite molded article shown in FIG.

4A and 4B show an example of a composite molded product of the present invention, wherein FIG. 4A is a plan view and FIG. 4B is a cross-sectional view taken along line CC of FIG.

FIGS. 5A and 5B show an example of a composite molded product of the present invention, wherein FIG. 5A is a plan view and FIG. 5B is a sectional view taken along line DD of FIG.

FIG. 6 shows an example of a cross-sectional view taken along the line AA of the composite molded article shown in FIG.

7 shows an example of a cross section of the composite molded article shown in FIG. 1, wherein (a) and (b) are AA cross sectional views,
(C) shows a BB cross-sectional view.

FIG. 8 is a plan view showing an example of the composite molded product of the present invention.

FIG. 9 is a schematic sectional view showing an example of a mold used in the method of the present invention.

10A and 10B are schematic diagrams illustrating a holding body that holds an edge of a thermoplastic resin sheet member, wherein FIG. 10A is a state in which the holding member is viewed from above, and FIG. 10B is a GG of FIG. (C) shows a cross-sectional state when cut along HH.

FIG. 11 is a cross-sectional view of a mold during supply of a thermoplastic resin sheet member in a manufacturing process according to the method of the present invention.

FIG. 12 is a cross-sectional view of a mold during supply of a molten thermoplastic resin in a manufacturing process according to the method of the present invention.

FIGS. 13A and 13B are cross-sectional views of a mold after clamping in a manufacturing process according to the method of the present invention, in which FIG. 13A shows a portion sandwiching a thermoplastic resin sheet member, and FIG. The portion where the thermoplastic resin sheet member is not sandwiched is shown.

FIGS. 14A and 14B are schematic diagrams showing a holding body that holds an edge of a thermoplastic resin sheet member, wherein FIG. 14A is a view of the holding member viewed from above, and FIG. (C) shows a cross-sectional state when cut along H′-H ′.

15A and 15B are cross-sectional views of a mold after clamping in a manufacturing process according to the method of the present invention, in which FIG. 15A shows a portion sandwiching a thermoplastic resin sheet member, and FIG. The portion where the thermoplastic resin sheet member is not sandwiched is shown.

FIG. 16 is a sectional view of a mold after clamping in a manufacturing process according to the method of the present invention, showing a portion where a thermoplastic resin sheet member is not sandwiched.

FIG. 17 is a cross-sectional view of a mold after a mold is clamped in a manufacturing process according to the method of the present invention, in which a molten thermoplastic resin is supplied to a rib portion.

FIGS. 18A and 18B are schematic diagrams showing a sandwiching body which sandwiches the edges of a skin material and a thermoplastic resin sheet member, wherein FIG. FIG. 4C shows a cross-sectional state when cut along the line -I, and FIG. 4C shows a cross-sectional state when cut along the line JJ.

FIG. 19 is a cross-sectional view of a mold during supply of a skin material and a thermoplastic resin sheet member in a manufacturing process according to the method of the present invention.

FIG. 20 is a sectional view of a mold during supply of a molten thermoplastic resin in a manufacturing process according to the method of the present invention.

FIG. 21 is a cross-sectional view of a mold after clamping in a manufacturing process according to the method of the present invention. FIG. 21 (a) shows a portion where a skin material and a thermoplastic resin sheet member are sandwiched.
(B) shows a portion where the skin material and the thermoplastic resin sheet member are not sandwiched.

FIG. 22 is a sectional view of a mold after a mold is clamped in a manufacturing process according to the method of the present invention.

[Explanation of symbols]

 1: Composite molded article 2: Composite molded article 3: Composite molded article 4: Composite molded article 5: Composite molded article 6: Thermoplastic resin base material 7: Thermoplastic resin sheet member 8, 8 ': Skin material 9: Backing material 10: Rib or boss 11: Male type 12: Female type 13: Clamping body 14: Fitting groove 15: Molten resin supply passage 16: Molten resin supply port 17: Thermoplastic resin sheet member 18: Molten thermoplastic resin 19: Recess 20: molten resin supply port

Claims (7)

[Claims] 1. A thermoplastic resin sheet member is supplied to a part of a cavity surface between a pair of male and female molds, and then a molten thermoplastic resin is supplied and filled into the cavity from a cavity where the sheet member does not exist. Forming a thermoplastic resin base member, and joining and integrating an end of the thermoplastic resin sheet member with an end of the thermoplastic resin base member. 2. A thermoplastic resin is supplied between a pair of male and female molds by separately supplying a skin material and a thermoplastic resin sheet member, and a molten thermoplastic resin is supplied between the skin material and one of the molds. The method for producing a composite molded article according to claim 1, wherein a skin material is bonded and integrated to at least a part of the surface of the substrate. 3. The method for producing a composite molded article according to claim 1, wherein a molten thermoplastic resin is supplied between the unclosed molds and filled into the cavity by mold clamping. 4. An end portion of a thermoplastic resin sheet member is sandwiched between clamping members, and the clamping member is fitted into a fitting groove provided in a mold to place the thermoplastic resin sheet member on a mold forming surface. The method for producing a composite molded article according to claim 1, wherein the composite molded article is fixed to the composite molded article. 5. The skin material and the edge of the thermoplastic resin sheet member are overlapped with each other and sandwiched by a sandwiching body, and the sandwiching body is fitted into a fitting groove provided in a mold so as to be in contact with the skin material. 4. The method according to claim 2, wherein the thermoplastic resin sheet member is fixed to a molding surface. 6. A protruding portion formed by using a mold provided with a recess in a mold corresponding to the back side of a thermoplastic resin sheet member and supplying a molten thermoplastic resin to the recess. The method for producing a composite molded article according to claim 1, wherein the thermoplastic resin sheet member and the thermoplastic resin sheet member are fused and integrated. 7. The method according to claim 1, wherein a softened thermoplastic resin sheet member is supplied by heating between a pair of male and female molds.