JP2005022379A - Method for producing composite of lightweight member and functional part, and composite - Google Patents

Abstract

PROBLEM TO BE SOLVED: To strongly heat a functional component such as a fixture to a lightweight member without forming a through hole in the lightweight member when manufacturing a composite in which the functional component such as a fixture is thermally bonded to the lightweight member. A method for producing a composite that can be bonded is provided.
A light-weight member having a single-layer or multi-layer structure in which a functional part configured to be thermally bonded to the thermoplastic resin foam layer and having a rod-shaped portion includes at least one thermoplastic resin foam layer. In addition, the central axis of the rod-shaped portion is rotated about the rotation axis and the tip of the rod-shaped portion is pressed against an arbitrary portion of the lightweight member, and the portion is softened or melted to form the rod-shaped portion inside the thermoplastic resin foam layer. By intruding the tip, the functional parts such as the fixture can be firmly heat-bonded to the light-weight member without forming a through hole in the light-weight member by heat-bonding.
[Selection] Figure 1

Description

  The present invention relates to a method for manufacturing a composite of a lightweight member and a functional component, and the composite.

  A lightweight member having a single-layer or multilayer structure including at least one thermoplastic resin foam layer is lightweight and excellent in heat insulation and shock absorption, and thus is widely used in various applications.

  For example, a lightweight member can be used for a bath lid as a heat insulating material. Such a bath lid is more convenient to use if it can be folded. An easily foldable bath lid can be formed by attaching one other member such as a connecting member having a hinge function so as to connect a plurality of lightweight members.

  In order to attach the connecting member as described above to the lightweight member, the connecting member is overlapped with the lightweight member, and a hole is made so as to penetrate both of them, and a fixing tool such as a rivet is passed through the hole, and the shaft portion of the fixing tool is inserted. What is necessary is just to fix a connection member to a lightweight member by crushing or expanding the front-end | tip. In this way, the connecting member and the lightweight member can be firmly fixed. However, if the size of the portion through which the fixing tool is passed is large, it is difficult to open the through hole. The length of the part must be increased according to the depth of the through hole, and the material cost of the fixture is increased more than necessary. Furthermore, a through hole must be formed in advance in the lightweight member, which is not efficient.

  In addition, in order to prevent the appearance of the connecting member attached to the lightweight member as much as possible, a through hole is provided in the lightweight member so that a hole or rivet is not exposed on the surface opposite to the side through which the fixture is passed. It is better to attach the connecting member to the lightweight member without opening it. This is because, for example, a plastic fixture in the form of a rivet is prepared, the connecting member is stacked on the lightweight member, the tip of the fixture is heated to a softened state, and the connecting member is penetrated so that the lightweight member is It can be carried out by a method in which the tip of a softened fixture is pressed against the surface and fused. However, in such a method, since the lightweight member and the fixture are merely fused on a plane, a large adhesive force cannot be expected between them.

In addition, a single-layer or multi-layered lightweight member including a thermoplastic resin foam layer is a backing material that is integrally provided with an interior material on the back side of an automotive interior material in order to reduce the weight of the automobile or improve its thermal insulation. Used as. Thus, the interior material provided with the lightweight member usually has a clip attached to the lightweight member side, and is attached and fixed to the door panel of the automobile by fitting the clip into a predetermined hole of the door inner panel (Patent Document 1). reference.).
In this case, it is necessary to attach the clip to the lightweight member side, but the same problem as the attachment of the fixture to the lightweight member occurs as in the example of the bath lid described above.

  Furthermore, lightweight members having a single-layer or multi-layer structure including a thermoplastic resin foam layer are also used for a cold insulation box, a return box for parts, etc., in order to display identification or content on these surfaces. The same problem as when attaching a fixture to a lightweight member as shown in the above example of a bath lid when attaching a plate or the like on which these indications are printed or stamped using the fixture There is.

JP-A-10-16055

  In view of the above-described problems, the present invention provides a functional product such as a fixture without forming a through hole in the lightweight member when manufacturing a composite in which a functional component such as a fixture is thermally bonded to the lightweight member. It aims at providing the manufacturing method of the composite_body | complex which can make components heat-bond firmly to a lightweight member.

  The present invention is (1) a method for producing a composite obtained by thermally bonding a functional component to a lightweight member having a single-layer or multilayer structure including at least one thermoplastic resin foam layer, the functional component comprising: The thermoplastic resin foam layer is configured to be heat-bondable and has a rod-shaped portion. The functional component is rotated with the central axis of the rod-shaped portion as a rotation axis, and the light-weight member has a rod-like shape at an arbitrary position. The composite body is characterized in that the functional part is thermally bonded to the lightweight member by pressing the tip of the part, softening or melting the part, and intruding the tip of the rod-like part into the thermoplastic resin foam layer. (2) The lightweight member has a multilayer structure in which a non-foamed thermoplastic resin layer is provided on the surface, and the non-foamed thermoplastic resin layer penetrates the tip of the rod-shaped portion of the functional component. It can penetrate into the thermoplastic foam layer. (3) The method for producing a composite according to (1), wherein the composite is thermally bonded to the lightweight member, (3) The method for producing a composite according to (1) or (2), wherein the rod-like portion has a cylindrical shape, The functional part is a method for producing a composite according to any one of the above (1) to (3) made of a thermoplastic resin, and (5) the functional part is at an arbitrary position excluding the tip of the rod-shaped part. (4) A method for manufacturing a composite according to (4) above, wherein a head or butt protruding in the lateral direction is formed, and (6) a method for manufacturing a composite according to (5) above, A method of manufacturing a composite in which another member is stacked on the surface, and the other member is fixed to the lightweight member by penetrating the other member and thermally bonding the functional component to the lightweight member, (7) above (1 ) To (6), the composite obtained by the method for producing a composite according to any one of (6) It is intended.

  The present invention provides a functional member having a rod-shaped portion and a light-weight member having a single-layer or multi-layer structure including at least one thermoplastic resin foam layer that can be thermally bonded to the thermoplastic resin foam layer. The functional part is rotated with the central axis of the rod-shaped portion as the rotation axis, and the tip of the rod-shaped portion is pressed against an arbitrary portion of the lightweight member to soften or melt the portion, so that the thermoplastic resin foam layer is placed inside the thermoplastic resin foam layer. Manufactures a composite in which a functional part is firmly bonded to a lightweight member without forming a through hole in the lightweight member by thermally bonding the functional part to the lightweight member by intruding the tip of the rod-shaped part can do.

The method of the present invention will be described in detail with reference to the drawings.
The present invention relates to a method for producing a composite obtained by thermally bonding a functional component to a lightweight member having a single-layer or multilayer structure including at least one thermoplastic resin foam layer, the functional component including the thermal component. It is configured to be heat-bondable with the plastic resin foam layer, and has a rod-shaped portion. The functional part is rotated with the central axis of the rod-shaped portion as a rotation axis, and the tip of the rod-shaped portion is placed at an arbitrary position of the lightweight member. The functional part is thermally bonded to a lightweight member by softening or melting the portion and pressing the tip of the rod-like portion into the thermoplastic resin foam layer so that the functional part is thermally bonded to the lightweight member. It is.

  As shown in FIGS. 1 and 2 (1) to (3), the functional component 1 according to the present invention includes a rod-like portion 11 formed in a slightly tapered truncated cone shape toward one end, and the other end. The head portion 12 is formed by projecting radially in the lateral direction from the center axis of the truncated cone that constitutes the rod-shaped portion 11. A hole 15 is formed at the tip of the rod-shaped portion 11, and a polygonal receiving hole 13 is formed from the center of the head 12 toward the tip of the rod-shaped portion 11. The notch grooves 14 are formed radially from the center of the head 12.

  As shown in FIGS. 3 and 4, the columnar head 5 that can be mounted on a rotating device that rotates the functional component 1 includes a depressed portion 27 that is formed in a cylindrical shape near the tip. The projecting portion 26 is formed in a shape that can be fitted into the receiving hole 13 of the rod-shaped portion 11 from the central position of the rod-shaped portion 11, and the protruding portions 25 are formed radially at the inner corner positions of the recessed portion 27.

  The rotating device may be any device that can rotate and stop the functional component 1, and an electric drill, a drilling machine, or the like can be appropriately employed. For example, when an electric drill is adopted as the rotating device, if the tip of the head 5 attached to the rotary shaft of the electric drill is designed to be fitted according to the shape of the functional component 1, the functional component and the lightweight member At the time of thermal bonding, the method of the present invention can be easily carried out by attaching the functional component 1 to the head 5. It is preferable that the rotating device is provided with a clutch mechanism because this mechanism can easily manage the torque of the functional component and rotate and stop the rotating shaft of the rotating device.

  In the present invention, by fitting the receiving hole 13 of the functional component 1 into the protruding portion 26 at the tip of the head 5 mounted on the rotating device and fitting the notch groove 14 into the protruding portion 25, the functional component is obtained. 1 are attached to the head 5 so as not to slip each other when the rotating shaft 4 of the rotating device rotates.

In the present invention, the functional component 1 is thermally bonded to a desired portion of the lightweight member as follows.
The functional component 1 rotates around the central axis of the rod-shaped portion 11 by the rotation of the head 5 attached to the rotation shaft 4 of the rotating device, and the tip of the rod-shaped portion 11 of the functional component 1 is a predetermined weight member. When pressed against a location, the location of the lightweight member and the functional component 1 generate heat due to friction between them, and the tip of the rod-like portion 11 of the functional component 1 and / or the location of the lightweight member softens or melts, The tip of the rod-shaped part 11 enters the thermoplastic resin foam layer of the lightweight member like a screw. When the tip of the rod-shaped portion 11 enters the light weight member until it reaches a required depth, the rotation of the functional component 1 is stopped by stopping the rotation of the functional component 1, and the functional component 1 is further moved from the head 5. Let go. If the softened or melted functional part 1 and / or the lightweight member cools and solidifies, the functional part 1 adheres to the lightweight member.
In addition, the resin which comprises the rod-shaped part 11 of the functional component 1, and / or a lightweight member flows into the hole 15 provided in the front-end | tip of the rod-shaped part 11 of the functional component 1 at the time of above-mentioned softening or a fusion | melting. Therefore, the adhesion between the functional component 1 and the lightweight member is further strengthened by the hole 15.

  The rod-shaped portion 11 of the functional component 1 preferably rotates at a rotation speed of about 1000 to 5000 revolutions per minute, and the entry speed of the rod-shaped portion 11 of the functional component 1 is generally 0.5 to 10 mm / sec. However, 1-7 mm / sec is preferable.

In addition, in this invention, the location of the lightweight member which presses the rod-shaped part 11 of the functional component 1 is not specifically limited.
Moreover, in this invention, 1 mm-100 mm are preferable and, as for the depth which makes the rod-shaped part 11 approach into the inside of the foam layer of a lightweight member, 2 mm-30 mm are more preferable. If the depth of penetration is shallow, there is a possibility that the fixing force is inferior. Moreover, it is not necessary to be deeper than necessary. Moreover, in order not to deteriorate the external appearance of the opposite side, it is preferable that the rod-shaped part 11 does not allow the lightweight member to penetrate to the opposite side.
Furthermore, if the apparent density of the thermoplastic resin foam layer of the lightweight member is too large, it may be difficult to enter the rod-shaped portion, and if the apparent density is too small, the adhesive strength with the rod-shaped portion may be inferior. From such a viewpoint, the apparent density of the thermoplastic resin foam layer is preferably 5 to 600 g / L, more preferably 10 to 500 g / L, and still more preferably 15 to 450 g / L.

  The head 12 of the functional component 1 is not limited to the one having a polygonal concave receiving hole 13 formed at the center position thereof. When the functional component 1 attached to the rotating device rotates around the central axis of the rod-shaped portion 11 as a rotating shaft, the shape and the like are devised so that the functional component 1 can efficiently rotate without causing slippage between the functional component 1 and the rotating device. Therefore, the head 12 may be formed in a polygonal shape (formed in a shape like a bolt head), and further in a shape formed by combining the receiving hole 13 with such a shape. Also good.

In the present invention, as shown in FIG. 5, an apparatus 10 used for spin welding can also be used.
This device 10 includes a rotating means 3 for rotating a rotating shaft 4 provided with a head 5 at the tip, and a movement adjusting means 2. The functional component 1 can be attached to the tip of the head 5 as described above. The movement preparing means 2 is configured to be movable in the position of the tip of the rod-shaped portion 11 of the functional component 1 attached to the head 5. A lightweight member 21 is fixedly arranged in the movement direction of the movement preparation means 2.

  The thermal bonding between the functional component 1 and the lightweight member 21 is performed by rotating the functional component 1 attached to the head 5 by the rotation of the rotating shaft 4 of the rotating means 3 and moving the movement adjusting means 2 to move the rod-shaped portion. The tip of 11 is pressed against a desired part of the lightweight member 21, the part is softened or melted, and the tip of the rod-like portion 11 is penetrated into the thermoplastic resin foam layer of the lightweight member like a screw.

  As described above, in the method of the present invention, the thermoplastic resin foam layer and the functional component 1 have thermal adhesiveness, and the functional component 1 has the rod-shaped portion 11 so that the tip of the rod-shaped portion 11 is attached. Since the thermoplastic resin foam layer and the functional component 1 can be heat-sealed in a state where they are invaded into the foam layer, the fixing force of the functional component 1 is large.

  Further, since the lightweight member includes the thermoplastic resin foam layer, while the functional part 1 is rotated, the tip of the rod-like portion 11 is pressed against an arbitrary portion of the lightweight member to generate heat and soften or melt the portion. When the tip of the rod-shaped portion 11 is allowed to enter the inside of the thermoplastic resin foam layer, the foam layer is easily melted to reduce the volume, so that the rod-shaped portion 11 can easily enter the foam layer.

  Further, when the functional component 1 is thermally bonded to the lightweight member, the tip of the rod-like portion 11 is arbitrarily attached to the lightweight member while rotating the functional component 1 with the central axis of the rod-like portion 11 of the functional component 1 as the rotation axis. The portion is heated to be softened or melted by being pressed against the portion, and the functional part 1 is thermally bonded to the lightweight member by causing the tip of the rod-like portion 11 to enter the thermoplastic resin foam layer. Therefore, it is not necessary to make a hole in the lightweight member in advance, and the functional component 1 can be fixed to the lightweight member efficiently.

In the present invention, another member is stacked on the surface of the lightweight member, and the other member is fixed to the lightweight member by penetrating the other member and thermally bonding the functional component 1 to the lightweight member. Also good. For example, another member provided with an opening having a diameter larger than the rod-shaped portion 11 of the functional component 1 and smaller than the head 12 is overlapped on a lightweight member at a required position, and then the rod-shaped portion 11 of the functional member 1 is replaced with another member. The other member can be firmly fixed to the lightweight member by penetrating the opening of the member and pressing the lightweight component while rotating the tip of the rod-shaped portion 11 to thermally bond the functional component 1 to the lightweight member. .
Thereby, a plurality of different lightweight members can be connected via other members.

  In the present invention, the lightweight member may form either a multilayer structure including a thermoplastic resin foam layer or a single layer structure of a thermoplastic resin foam. In the case of a multilayer structure, the non-foamed thermoplastic resin A layer may be formed on the surface.

  In the present invention, when the lightweight member has a multilayer structure in which the surface is a non-foamed thermoplastic resin layer, the rod-like portion 11 of the functional component 1 penetrates the non-foamed thermoplastic resin layer on the lightweight member surface. Furthermore, when the tip of the rod-like portion 11 enters the inside of the lightweight member, a composite body is formed by bonding the functional component 1 to the lightweight member. By using a lightweight member that forms a multilayer structure with the surface being a non-foamed thermoplastic resin layer, in the composite, the non-foamed thermoplastic surface of the lightweight member is hard so as to surround the rod-like portion 11 of the functional component 1 Even if a lateral force is applied to the functional component 1 even when a resin layer is present, the non-foamed thermoplastic resin layer effectively prevents the functional component 1 from falling down. It is more firmly fixed to the lightweight member.

  Here, if the non-foamed thermoplastic resin layer to be present on the surface of the lightweight member is too thin, the effect of preventing the functional component 1 from falling over is small, and if it is too thick, the rod-like portion 11 of the functional component 1 is formed. There is a possibility that the non-foamed thermoplastic resin layer cannot be penetrated. From such a viewpoint, the thickness of the non-foamed thermoplastic resin layer present on the surface of the lightweight member is preferably 0.02 mm to 5.0 mm, more preferably 0.07 mm to 3.0 mm, and 0.1 mm to 2.0 mm. Is more preferable.

  In the present invention, the rod-like portion 11 of the functional component 1 is not limited to the truncated cone shape, and may be formed in a columnar shape. If the rod-shaped portion 11 is not a columnar shape that is formed in an axially symmetrical manner, when the rod-shaped portion 11 is caused to enter the light-weight member while being heated while rotating, the light-weight member and the periphery of the rod-shaped portion 1 are between Large gaps are likely to occur, and functional parts are likely to wobble. In addition, the stick-shaped portion 11 tends to have a larger adhesive force in the columnar shape than in the shape of a truncated cone at the tip.

  In the present invention, the material of the functional component 1 is not particularly limited, and may be made of a thermoplastic resin.

  When the functional component 1 is made of a thermoplastic resin, it is possible to increase the thermal adhesive force with the thermoplastic resin foam layer constituting the lightweight member. However, since the thermoplastic resin constituting the functional part 1 and the thermoplastic resin constituting the thermoplastic resin foam layer of the lightweight member need to have thermal adhesiveness, the thermal adhesive force is mutually applied. It is more preferable that it is large. Further, when the functional part 1 is made of a thermoplastic resin, rust does not occur in the functional part 1, and therefore, it is preferable because the composite is not contaminated by rust even if it is used in a place with high humidity or moisture.

  The thermoplastic resin constituting the thermoplastic resin foam of the lightweight member and the thermoplastic resin constituting the functional component 1 are not particularly limited as long as they have thermal adhesiveness to each other, but both the thermoplastic resins are the same. It is desirable that the main monomer component is the same among the monomer components forming the thermoplastic resin. Thermoplastic resins include propylene homopolymers, propylene resins such as copolymers with other monomers based on propylene, ethylene homopolymers, copolymers with other monomers based on ethylene Examples thereof include styrene resins such as ethylene resins such as styrene homopolymers, copolymers with other monomers mainly composed of styrene, thermoplastic polyester resins, polyphenylene ether resins, and the like.

  In addition, when the thermoplastic resin which comprises the foam layer of a lightweight member contains the thermoplastic resin which has a functional group, it can be thermally bonded also to a metal. For example, a thermoplastic resin having a functional group obtained by graft polymerization of maleic anhydride to polystyrene or polyolefin is easily bonded to a metal. In this case, the functional component 1 may be made of metal.

  In the present invention, the functional component 1 does not have to include the head 12 as long as it can be pressed against the lightweight member while rotating the tip of the rod-shaped portion 11. Moreover, the functional component 1 may have a portion (hereinafter also referred to as a collar portion) that is formed in a bowl shape by projecting in a lateral direction at an arbitrary position except the tip of the rod-like portion 11. Good.

Since the functional part 1 is provided with a head portion and a heel portion projecting in the lateral direction, when using this to fix other members to the lightweight member, the other members are unlikely to come off from the lightweight member. There are advantages.
In addition, when the functional part 1 is provided with a flange portion that protrudes in the lateral direction to form a portion that further protrudes on the flange portion, when fixing the other member and the lightweight member, The rod-shaped portion is rotated between the flange portion and the lightweight member, the rod-shaped portion is rotated to enter the thermoplastic resin foam layer and thermally bonded, and then another member can be coupled to the protruding portion. For example, the functional component 1 can be stably fixed to the lightweight member by the collar portion, and another member can be fixed to the protruding portion of the functional component. An example of this is a clip.

  The present invention uses the functional component 1 as a fixture such as a rivet for fixing another member such as a connecting member or a name plate to a lightweight member, or for fixing a functional component to another member. By using it as a fixture such as a clip, there is an advantage that other members can be fixed to the lightweight member more easily and firmly.

  In addition, the composite formed according to the present invention becomes a composite with a higher fixing force between the lightweight member and the functional component, and is therefore preferably used for applications such as bath lids, automobile backing materials, returnable boxes, etc. It is possible.

Examples 1-12
A plate-shaped lightweight member (thickness of a lightweight member of 17 mm, with a non-foamed layer composed of a mixture of polypropylene and high-density polyethylene integrally bonded to the entire surface of a foam composed of polypropylene having a melting point (melting peak temperature) of 159 ° C. Non-foamed layer thickness of 1.5 mm, foam layer thickness of 14 mm, lightweight member apparent density of 170 g / L, and functional parts with melting point (melting peak Temperature) (made of polypropylene at 162 ° C.), and the tip of the head provided on the rotating means is fitted and fixed in the receiving hole formed at the center of the head of the functional component, and the rod-shaped portion of the functional component is fixed. Rotate at the rotational speed (rpm) as shown in Table 1 as the central axis, and press against the lightweight member with the feed (lowering speed) (mm / sec) shown in Table 1 with the tip of the rod part of the functional part rotating , It stops the rotation at that 5mm enters the lightweight component, remove the functional part from the head, to obtain a complex of the functional parts and lightweight component. The melting peak temperature is a value measured by a heat flux DSC using “when measuring the melting temperature after performing a certain heat treatment” as a condition adjustment of a test piece according to JIS K 7121-1987. is there. At this time, the heating rate in adjusting the condition of the test piece and the test was 10 ° C. per minute, and the cooling rate in adjusting the condition of the test piece was set to minus 10 ° C. per minute.

The dimensions and shapes of the functional parts used in Examples 1 to 12 are represented by S and T in the shape column of Table 1.
In Table 1, when the shape of the example is S, the functional part is provided with a rod-shaped portion formed in a columnar shape having a length of 10 mm and a diameter of 6 mm, and opens at the tip of the rod-shaped portion toward the tip of the rod-shaped portion. The hole (having the same central axis as the central axis of the rod-shaped part) 3.5 mm and the depth of 8 mm is formed, and the diameter (having the same central axis as the central axis of the rod-shaped part) 11.8 mm, A head formed in a columnar shape with a height of 3 mm is provided, and a hexagonal shape with a diameter of 6 mm and a receiving hole with a depth of 3 mm are formed at the center of the head.

  In Table 1, when the shape of the example is T, the functional component has a length of 10 mm, a diameter of the portion connected to the head of 6 mm, and a diameter of the tip (the same central axis as the central axis of the rod-shaped part) ) A rod-shaped portion formed in an elliptical column shape of 5 mm is provided, and a hole having a diameter (having the same central axis as the central axis of the rod-shaped portion) of 3.5 mm and a depth of 8 mm is opened at the tip of the rod-shaped portion. Furthermore, a head formed in a cylindrical shape with a diameter (having the same central axis as the central axis of the rod-shaped part) of 11.8 mm and a height of 3 mm is provided, and a hexagonal diameter of 6 mm is provided at the center of the head. A receiving hole having a shape and a depth of 3 mm is formed.

  When the shape of the example in Table 1 is S (hole filling), the functional component is provided with a rod-shaped portion formed in a columnar shape having a length of 10 mm and a diameter of 6 mm, and no hole is formed. The head is formed in a cylindrical shape of 11.8 mm and 3 mm in height (having the same central axis as the central axis of the rod-shaped part), and a hexagonal shape with a diameter of 6 mm and a receiving hole with a depth of 3 mm are formed at the center of the head It is made.

The composite obtained as described above was allowed to stand in a room at 23 ° C. for 48 hours, and then the maximum load when the functional part was pulled out from the composite at a speed of 2 mm / min was measured. The results are shown in Table 1.
(Table 1)

  In any of the examples, a large maximum load greatly exceeding 50 N was shown, and it was proved that the fixing strength of the functional component and the lightweight member in the obtained composite was large. Moreover, the result of Table 1 has shown that fixed strength (maximum load) changes with the shapes, rotation speed, and feed speed of a functional component. If these are taken into consideration and the experiment is repeated, an arbitrary fixing strength can be stably realized.

It is a perspective view which shows one of the Example of a functional component in this invention. (1) It is a rear view which shows one of the Examples of a functional component in this invention. (2) It is a side view which shows one of the Examples of a functional component in this invention. (3) It is a front view which shows one of the Examples of a functional component in this invention. It is a perspective view which shows one of the Examples of the head site | part which attaches a functional component in this invention. It is a side view which shows one of the Examples of the head site | part which attaches a functional component in this invention. It is a side view which shows one of the Examples of the apparatus which attaches a functional component to a lightweight member in this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Functional component 11 Rod-shaped part 12 Head 13 Receiving hole 14 Notch groove 15 Hole

Claims (7)

A method for producing a composite comprising a functional component thermally bonded to a lightweight member having a single-layer or multilayer structure including at least one thermoplastic resin foam layer, the functional component comprising the thermoplastic resin foam It is configured to be heat-bondable to the layer and has a rod-shaped portion, and the functional part is rotated with the central axis of the rod-shaped portion as a rotation axis, and the tip of the rod-shaped portion is pressed against an arbitrary portion of the lightweight member, A method for producing a composite, characterized in that a functional part is thermally bonded to a lightweight member by softening or melting the portion and allowing the tip of a rod-like portion to enter the inside of the thermoplastic resin foam layer. The lightweight member has a multilayer structure in which a non-foamed thermoplastic resin layer is provided on the surface, and the tip of the rod-shaped portion of the functional part is inserted through the non-foamed thermoplastic resin layer to form a thermoplastic resin foam layer. The manufacturing method of the composite_body | complex of Claim 1 which heat-bonds to this lightweight member by making it penetrate | invade. The method for producing a composite according to claim 1, wherein the rod-shaped portion has a columnar shape. The method for producing a composite according to any one of claims 1 to 3, wherein the functional part is made of a thermoplastic resin. The method for producing a composite according to claim 4, wherein the functional part is formed with a head portion or a flange portion projecting in a lateral direction at an arbitrary position excluding the tip of the rod-shaped portion. It is a manufacturing method of the composite_body | complex of Claim 5, Comprising: Other members are piled up on the surface of a lightweight member, and other members are penetrated through this other member, and a functional component is thermally bonded to a lightweight member. A method for producing a composite to be fixed to the lightweight member. The composite_body | complex obtained by the manufacturing method of the composite_body | complex of any one of Claim 1 thru | or 6.

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