Molded body, glass run, mold, and method for manufacturing molded body

Abstract

To provide a molded body that does not cause an appearance defect even when different materials are joined together, a glass run using the molded body, a mold for molding the molded body, and a method for manufacturing the molded body.SOLUTION: A molded body includes: a first molded portion having a thermoplastic resin; a second molded portion molded from vulcanized rubber; and a melting joint portion for melting and joining the first melted portion and the second molded portion.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a molded body in which different molded parts are melt-bonded, a glass run using the molded body, a mold for molding the molded body, and a method for manufacturing the molded body. [Background technology]

[0002] Conventionally, there exists a type of glass run (GRC), which is a component that constitutes the window frame of an automobile, that is made up of a combination of a rail member 102 and a corner member 104, as shown in Fig. 8(a). As shown in Fig. 8(b), the rail member 102 is made up of a base 106 and a sliding part 110 that slides against the rising and lowering glass 108.

[0003] As a method for manufacturing a glass run having such a structure, as shown in FIG. 9, a method is known in which a corner member 104 is melt-bonded by injection molding to a rail member 102 previously prepared by extrusion molding.

[0004] In this case, the corner material 104 is made of either a thermoplastic elastomer or vulcanized rubber, but when injection molding vulcanized rubber, the temperature of the injection molding die 112 must be set to a high temperature of approximately 200°C.

[0005] In this way, if vulcanized rubber is used for the corner material 104 and a thermoplastic resin such as polyolefin is used for the sliding portion 110 of the rail member 102, and they are melted and joined, there is a problem that the sliding portion 110 melts when it comes into contact with the mold at high temperature 112, causing a defective appearance of the molded glass run. For this reason, a glass run consisting of a rail member 102 containing a thermoplastic resin and a corner material 104 made of vulcanized rubber has not been put to practical use.

[0006] In order to solve such poor appearance problems of glass runs, Patent Document 1 reports a glass run with a good appearance by using a glass run extrusion molded part with flocking treatment on the sliding part and embedding the base of the extrusion molded part in an insert molded part to make the connecting wire less noticeable. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] JP 2006-213242 A Summary of the Invention [Problem to be solved by the invention]

[0008] However, even in the glass run described in Patent Document 1, if a thermoplastic sliding material is used in the sliding part, the sliding part melts when it comes into contact with a high-temperature mold during insert molding, and ultimately the glass run has a problem of poor appearance.

[0009] An object of the present invention is to provide a molded body that does not suffer from poor appearance even when different materials are joined together, a glass run using the molded body, a mold for molding the molded body, and a method for manufacturing the molded body. [Means for solving the problem]

[0010] As a result of extensive research, the inventors discovered that the above-mentioned problems could be solved by melt-joining a first molded part having a thermoplastic resin and a second molded part made by molding vulcanized rubber, and thus completed the present invention.

[0011] The present invention relates to the following molded bodies [1] to [3], glass runs [4] to [6], dies [7] to [9], and methods for producing the molded bodies

[10] to

[14] . [1] A first molded portion having a thermoplastic resin; A second molding portion formed by molding vulcanized rubber; a fusion joining portion that fusion-joins the first molding portion and the second molding portion; A molded body comprising: [2] The first molding portion has a sliding portion containing the thermoplastic resin, The molded article according to [1], wherein the sliding portion has a surface roughness of 0.5 to 9.0 μm. [3] The first molding portion has a sliding portion containing the thermoplastic resin, The molded article according to [1] or [2], wherein the coefficient of dynamic friction of the sliding portion is 0.05 to 0.5. [4] A glass run using the molded article according to any one of [1] to [3]. [5] The first molding portion is a rail portion of the glass run, The second molding portion is a corner portion located at a corner of the glass run and fused and joined to the rail portion. [4] The glass run described in. [6] The glass run according to [4] or [5], wherein the thermoplastic resin contains polyethylene. [7] A mold for producing a molded article comprising a first molding portion having a thermoplastic resin, a second molding portion molded from vulcanized rubber, and a melt-joining portion that melt-joins the first molding portion and the second molding portion, A first mold part into which the first molding part that has been molded in advance is inserted; A second mold part adjacent to the first mold part and configured to mold the second molding part; a thermal insulation layer disposed between the first mold part and the second mold part; A mold comprising: [8] The mold according to [7], wherein the thermal conductivity of the heat insulating layer is 0.001 to 0.7 W / m K. [9] A first temperature adjustment unit that adjusts the temperature of the first mold unit; a second temperature adjustment unit that adjusts the temperature of the second mold unit; The mold according to [7] or [8], comprising:

[10] A method for producing a molded product using the mold according to any one of [7] to [9], a first molding step of forming the first molding part having the thermoplastic resin; an inserting step of inserting the first molding part into the first mold part of the mold; A second molded portion molding step of injecting vulcanized rubber into the second mold portion of the mold to form the second molded portion and melt-bonding an end of the second molded portion to the first molded portion. A method for producing a molded body, comprising the steps of:

[11] The mold includes a first temperature adjustment unit that adjusts the temperature of the first mold portion and a second temperature adjustment unit that adjusts the temperature of the second mold portion; The method for manufacturing a molded body described in

[10] , wherein the second molding portion molding process is performed while adjusting the temperature of the first mold portion by the first temperature adjustment portion and adjusting the temperature of the second mold portion by the second temperature adjustment portion.

[12] The method for producing a molded article according to

[10] or

[11] , wherein the thermoplastic resin contains polyethylene.

[13] The method for producing a molded body according to any one of

[10] to

[12] , wherein the temperature of the first mold part in the second mold part molding step is 0 to 130°C.

[14] The method for producing a molded article according to any one of

[10] to

[13] , wherein the molded article is a glass run. Effect of the Invention

[0012] According to the present invention, it is possible to provide a molded body that does not cause appearance defects at the joint between different materials, a glass run using the molded body, a mold for molding the molded body, and a method for manufacturing the molded body. [Brief description of the drawings]

[0013] [Figure 1] FIG. 2 is a diagram showing a glass run according to an embodiment. [Diagram 2] FIG. 1 is a perspective view showing an overview of a mold for molding a glass run according to an embodiment. [Diagram 3] 3 is a cross-sectional view showing a cross section of the mold taken along line A in FIG. 2. [Figure 4] 1A to 1C are diagrams showing an insert process when molding a glass run according to an embodiment. [Diagram 5] 11A to 11C are diagrams showing a second molding portion molding step when molding the glass run according to the embodiment. [Figure 6] 11A to 11C are diagrams showing a second molding portion molding step when molding the glass run according to the embodiment. [Figure 7]FIG. 13 is a diagram showing a state in which the glass run according to the embodiment is removed from a mold. [Figure 8] FIG. 1 is a diagram showing a conventional glass run. [Figure 9] FIG. 1 is a diagram showing a conventional method for making a glass run. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] A molded body, a glass run, a mold, and a method for manufacturing a molded body according to an embodiment of the present invention will be described with reference to the drawings. Hereinafter, a case in which the molded body is a glass run that is a component constituting a window frame of an automobile will be described as an example.

[0015] Fig. 1(a) is a perspective view showing a glass run 1 according to an embodiment of the present invention. As shown in Fig. 1(a), the glass run 1 has a rail portion 2 (first molded portion) that extends in one direction without bending, and a corner portion 4 (second molded portion) that is placed at the corner of a window frame in the glass run 1, and the end of the rail portion 2 and the end of the corner portion 4 are fused and joined (fused joint portion 6).

[0016] As shown in Fig. 1(b), the rail portion 2, which is the first molded portion, is composed of a base portion 8 that forms the main body of the rail portion 2, and a sliding portion 12 that slides against glass 10 that raises and lowers the vehicle door. The base portion 8 is made of a thermoplastic resin or vulcanized rubber. Among these, it is often preferable that the base portion 8 of the rail portion 2 and the corner portion 4 are made of the same material, and from this point of view, it is preferable that the base portion 8 is made of vulcanized rubber.

[0017] The sliding portion 12 contains a thermoplastic resin, and forms a layer on the surface of the base portion 8 that slides against the glass. Here, examples of the thermoplastic resin used in the base 8 include dynamically crosslinked thermoplastic elastomers (TPV). The vulcanized (crosslinked) rubber used in the base 8 may be a vulcanized body of natural rubber (NR) or a vulcanized body of synthetic rubber. Specific examples of the synthetic rubber include ethylene-propylene copolymer rubber (EPR), ethylene-propylene-diene copolymer rubber (EPDM), chloroprene rubber, silicone rubber, and polyurethane rubber. Among these, polyolefin rubbers such as EPR and EPDM are preferred for glass run applications requiring weather resistance, and EPDM is more preferred. When forming the base 8, other components used in the resin composition described below may be used.

[0018] Examples of the thermoplastic resin used in the sliding portion 12 include polyolefin and thermoplastic elastomer. The thermoplastic resin used in the sliding portion 12 may be one type or two or more types.

[0019] The polyolefin is not particularly limited, and examples thereof include homopolymers such as polyethylene, polypropylene, poly-1-butene, and poly-4-methyl-1-pentene, and copolymers of ethylene and other α-olefins (e.g., propylene, 1-butene, 1-pentene, 3-methyl-1-butene, 1-hexene, 4-methyl-1-pentene, 3-methyl-1-pentene, 1-octene, 1-decene, and 1-dodecene).As the other α-olefins, α-olefins having 3 to 6 carbon atoms are preferred, and propylene, 1-butene, 1-hexene, and 4-methyl-1-pentene are more preferred.

[0020] The polyolefin is preferably polyethylene, more preferably a resin containing 90 to 100 mol % of structural units derived from ethylene and 0 to 10 mol % of structural units derived from one or more monomers selected from α-olefins having 3 to 6 carbon atoms, and particularly preferably an ethylene homopolymer.

[0021] The sliding portion 12 may be formed from a thermoplastic resin (only), or may be formed from a resin composition containing a thermoplastic resin and other components. The content of the thermoplastic resin in the resin composition is preferably 70 to 100% by mass, and more preferably 80 to 100% by mass.

[0022] The other components are not particularly limited as long as they do not impair the object of the present invention, and examples thereof include silicone compounds, fillers, fatty acid amides, resin additives (for example, stabilizers such as heat stabilizers and weather stabilizers, antioxidants, ultraviolet absorbers, crosslinking agents, crosslinking assistants, antistatic agents, slip agents, antiblocking agents, antifogging agents, flame retardants, lubricants, colorants (dyes, pigments, etc.), flow improvers, plasticizers, dispersants, antibacterial agents, and mold release agents). One or more of the other components may be used.

[0023] The silicone compound is not particularly limited, and may be, for example, organosiloxane (so-called silicone oil) that has been used as a slip agent.Specific examples include polysiloxanes such as dimethylpolysiloxane, methylphenylpolysiloxane, and methylhydrogenpolysiloxane, and modified polysiloxanes obtained by modifying these polysiloxanes with epoxy, alkyl, amino, carboxy, alcohol, fluorine, alkylarakyl polyether, epoxy polyether, or polyether.

[0024] When the resin composition contains a silicone compound, the content of the silicone compound is preferably 0.1 to 20 parts by mass, more preferably 1 to 15 parts by mass, and even more preferably 3 to 10 parts by mass, relative to 100 parts by mass of the thermoplastic resin, from the viewpoint that a sliding part 12 having superior sliding properties can be easily obtained.

[0025] The surface roughness Ra of the sliding portion 12 is preferably 0.5 to 9.0 μm, more preferably 0.5 to 6.0 μm, and even more preferably 1.2 to 6.0 μm, thereby making it possible to prevent a large change in the surface roughness of the sliding portion before and after molding.

[0026] The sliding portion 12 preferably has a glossiness of 1 to 20, more preferably 1 to 12, and even more preferably 3 to 12. The sliding portion 12 preferably has a dynamic friction coefficient of 0.05 to 0.5, more preferably 0.05 to 0.4, and even more preferably 0.1 to 0.4. This allows the sliding portion 12 to exhibit excellent sliding properties in sliding with the door glass.

[0027] For the corner portion 4, vulcanized rubber is used. The vulcanized rubber may be a vulcanized body of natural rubber (NR) or a vulcanized body of synthetic rubber. Specific examples of the synthetic rubber include ethylene-propylene copolymer rubber (EPR), ethylene-propylene-diene copolymer rubber (EPDM), chloroprene rubber, silicone rubber, and polyurethane rubber. Among these, polyolefin rubbers such as EPR and EPDM are preferred for glass run applications requiring weather resistance, and EPDM is more preferred. When forming the corner portion 4, a vulcanized rubber composition containing other components used in the resin composition may be used. The second molded portion constituting the corner portion 4 is preferably formed by molding the vulcanized rubber (composition).

[0028] Fig. 2 is a perspective view showing an outline of a mold 14 for forming the glass run 1, and Fig. 3 is a cross-sectional view showing a cross section cut along line A in Fig. 2. As shown in Figs. 2 and 3, the mold 14 is composed of a first mold part 14a and an adjacent second mold part 14b, and a heat insulating layer 16 is formed in the gap between the first mold part 14a and the second mold part 14b. The heat insulating layer 16 is formed as a heat insulating material or an air gap.

[0029] The thermal conductivity of the heat insulating layer 16 is preferably 0.001 to 0.7 W / m·K, more preferably 0.01 to 0.6 W / m·K, even more preferably 0.02 to 0.6 W / m·K, and particularly preferably 0.02 to 0.4 W / m·K. This can prevent the thermoplastic resin of the first molding part inserted into the first mold part 14a from melting due to the influence of the heat of the second mold part 14b.

[0030] The type of the insulating material is not particularly limited, and fiber-based materials such as glass wool and cellulose fiber, and foam-based materials such as urethane foam and polystyrene foam can be used. The shape of the insulating material is not particularly limited, and felt, board, loose material, foam, etc. can be used. It is preferable to use an insulating material such as glass wool as the insulating layer 16, or to leave it as a gap.

[0031] The mold 14 is provided with a first temperature adjustment section 18a for adjusting the temperature of the first mold portion 14a, and a second temperature adjustment section 18b for adjusting the temperature of the second mold portion 14b. The first mold portion 14a has a first molding space 20 into which a previously extruded rail portion 2 is inserted, and the second mold portion 14b has a second molding space 22 for injection molding the corner portion 4.

[0032] Next, a method for forming the glass run 1 using the die 14 will be described. An operator uses an extrusion molding machine (not shown) to mold the rail portion 2, which is a first molded portion in which a layer of the sliding portion 12 has been formed in advance on the base portion 8 (first molded portion molding step).

[0033] Next, the worker prepares to mold the glass run 1 in the mold 14. That is, the worker adjusts the temperature of the first mold portion 14a to a low temperature of 20 to 120°C by the first temperature adjustment unit 18a, and adjusts the temperature of the second mold portion 14b to a high temperature of 180 to 220°C by the second temperature adjustment unit 18b.

[0034] 4, the rail portion 2 extruded in the first molding step is inserted into the first molding space 20 of the first mold portion 14a (insertion step). The temperature of the rail portion 2 to be inserted is preferably 0 to 130°C, more preferably 50 to 130°C, and even more preferably 70 to 130°C.

[0035] Next, as shown in Fig. 5, vulcanized rubber 24 is injected from a nozzle of an injection molding machine (not shown) into the second molding space 22 of the second mold portion 14b to form the corner portion 4, which is the second molded portion. As shown in Fig. 6, the vulcanized rubber 24 injected into the second molding space 22 reaches the rail portion 2 that closes the outlet side of the second molding space 22, and the vulcanized rubber 24 is melt-bonded to the end of the rail portion 2 (second molded portion molding process).

[0036] That is, the second molding portion molding step is performed while the temperature of the first mold portion 14a is adjusted by the first temperature adjustment unit 18a and the temperature of the second mold portion 14b is adjusted by the second temperature adjustment unit 18b. This results in the glass run 1 in which the rail portion 2 and the corner portion 4 are fused and joined.

[0037] Next, the temperature of the mold 14 is returned to room temperature by the first mold section 14a and the second temperature adjustment section 18b, and then the mold 14 is disassembled and the glass run 1 is removed as shown in FIG. According to the invention related to this embodiment, it is possible to provide a molded product that does not suffer from poor appearance even when different materials are joined together.

[0038] Furthermore, by providing a heat insulating layer 16 between the two mold parts, the first mold part 14a can be maintained at a low temperature even if the second mold part 14b is heated to a high temperature. Therefore, the thermoplastic resin of the sliding part 12 does not melt at high temperatures, and the appearance of the glass run 1 can be prevented from being deteriorated.

[0039] Furthermore, by melt-joining the rail portion and the corner portion, a glass run that is free of appearance defects even at the joint can be provided. By using the mold 14 and the manufacturing method as described above, even if a material with a low melting point is used for the sliding portion 12, the thermoplastic resin of the sliding portion 12 does not melt at high temperatures, so that the properties of the sliding portion 12 do not change before and after molding.

[0040] This makes it possible to maintain the dynamic friction coefficient, and to mold a sliding material having excellent sliding properties and abrasion resistance by extrusion, thereby providing a glass run molded product using vulcanized rubber as a corner material.

[0041] Furthermore, the surface roughness and gloss of the sliding portion can be maintained, making it possible to provide a glass run with a good appearance. In the above-described embodiment, the molded body is a glass run 1 as an example, but the molded body is not necessarily limited to a glass run 1 as long as it has a first molded portion having a thermoplastic resin, a second molded portion molded from vulcanized rubber, and a fusion-jointed portion that fusion-joins the first molded portion and the second molded portion.

[0042] In the above embodiment, the rail portion 2 is extrusion molded and the corner portion 4 is injection molded, but the molding method of the rail portion and the corner portion 4 is not necessarily limited to these methods. EXAMPLES

[0043] The following examples are provided to further explain the embodiments of the present invention. The present invention is not limited to the following examples, and various modifications are possible in detail.

[0044] <Example 1> The first molding part was molded using a co-extrusion molding machine consisting of a single screw extruder for the thermoplastic resin and a single screw extruder for the vulcanized rubber base.

[0045] Thermoplastic resin A (Lubmar® LBX-40B, manufactured by Mitsui Chemicals) was placed in a single-screw extruder for thermoplastic resins, and the resin temperature was set to 250°C. Vulcanized rubber (EPM-75B, manufactured by Tochi Co., Ltd.) was placed in a single-screw extruder for the vulcanized rubber base, and the resin temperature was set to 80°C. Thermoplastic resin A and vulcanized rubber were co-extruded so that the thickness of thermoplastic resin A was 0.1 mm, and a first molded part having the shape shown in Figure 1(b) was obtained.

[0046] Thereafter, a heat treatment was performed at 230°C for 3 minutes to crosslink the vulcanized rubber, thereby forming a first molded portion. Next, the obtained first molded portion was inserted into the first mold portion 14a installed in a vertical injection molding machine, and vulcanized rubber heated to 100°C was injection molded in the second mold portion 14b to produce a molded body having a first molded portion and a second molded portion.

[0047] Here, the mold temperature of the first molding part side as the first mold part 14a was set to 100°C, and the mold temperature of the second molding part side as the second mold part 14b was set to 200°C, and after the vulcanized rubber was injected, the mold was heated in a clamped state for 3 minutes, and then the molded body was removed. Between the first mold part 14a and the second mold part 14b, an insulating layer 16 of air (thermal conductivity 0.02 W / m K) was provided.

[0048] <Example 2> The first molding part was molded using a co-extrusion molding machine consisting of a single screw extruder for the thermoplastic resin and a single screw extruder for the vulcanized rubber base.

[0049] Thermoplastic resin B (Lubmar® TM-80B, manufactured by Mitsui Chemicals) was placed in a single-screw extruder for thermoplastic resins, and the resin temperature was set to 230°C. Vulcanized rubber (EPM-75B, manufactured by Tochi Co., Ltd.) was placed in a single-screw extruder for the vulcanized rubber base, and the resin temperature was set to 80°C. Thermoplastic resin B and vulcanized rubber were co-extruded so that the thickness of thermoplastic resin B was 0.1 mm, and a first molded part having the shape shown in Figure 1(b) was obtained.

[0050] Thereafter, a heat treatment was performed at 230°C for 3 minutes to crosslink the vulcanized rubber, thereby forming a first molded portion. Next, the obtained first molded portion was inserted into the first mold portion 14a installed in a vertical injection molding machine, and vulcanized rubber heated to 100°C was injection molded in the second mold portion 14b to produce a molded body having a first molded portion and a second molded portion.

[0051] Here, the mold temperature of the first molding part side as the first mold part 14a was set to 100°C, and the mold temperature of the second molding part side as the second mold part 14b was set to 200°C, and after the vulcanized rubber was injected, the mold was heated in a clamped state for 3 minutes, and then the molded body was removed. An insulating layer of air (thermal conductivity 0.02 W / m K) was provided between the first mold part 14a and the second mold part 14b.

[0052] <Experimental Results> The properties of the molded bodies molded in Examples 1 and 2 are shown in Table 1.

[0053] [Table 1]

[0054] In the examples, the surface roughness, gloss and dynamic friction coefficient were measured as follows.

[0055] [Surface roughness] The arithmetic mean roughness of the surface of the thermoplastic resin part of the first molded part was measured using a Mitutoyo surface roughness meter, and was taken as the surface roughness. The measurement conditions were in accordance with JIS B0601-1994.

[0056] [Gross] The gloss of the surface of the thermoplastic resin part of the first molded part was measured using a gloss checker IG320 manufactured by Horiba, Ltd.

[0057] [Kinematic friction coefficient] The thermoplastic resin portion of the first molded portion was cut into a rectangular shape having a width of 5 mm and a length of 200 mm to be used as a measurement sample.

[0058] The measurement sample was fixed to a Shinto Scientific Gakushin-type abrasion tester, and a 3 cm square glass plate was placed on the sample surface as the counter material.Then, the average friction coefficient was measured when the glass was slid in one direction under the conditions of a load of 250 g, a speed of 3 mm / s, and a test distance of 100 mm. [Explanation of symbols]

[0059] 1 Grassland 2 Rail section 4 Corner section 6. Welded joint 8 base 10. Glass 12 Sliding part 14 Mold 14a First Mold Section 14b Second mold section 16 Thermal insulation layer 18a First temperature adjustment section 18b Second temperature adjustment section 20 First molding space 22 Second molding space 24 Vulcanized rubber 102 Rail parts 104 Corner material 106 Base 108 Glass 110 Sliding part 112 Mold

Claims

1. A first molded portion having a thermoplastic resin; A second molding portion formed by molding vulcanized rubber; a fusion joining portion that fusion-joins the first molding portion and the second molding portion; A molded body comprising:

2. The first molding portion includes a sliding portion containing the thermoplastic resin, The molded article according to claim 1, wherein the sliding portion has a surface roughness of 0.5 to 9.0 μm.

3. The first molding portion includes a sliding portion containing the thermoplastic resin, The molded article according to claim 1, wherein the sliding portion has a dynamic friction coefficient of 0.05 to 0.

5.

4. A glass run using the molded article according to any one of claims 1 to 3.

5. The first molding portion is a rail portion of the glass run, The second molding portion is a corner portion located at a corner of the glass run and fused and joined to the rail portion. The glass run according to claim 4.

6. The glass run according to claim 4 , wherein the thermoplastic resin comprises polyethylene.

7. A mold for producing a molded article including a first molding portion having a thermoplastic resin, a second molding portion molded from vulcanized rubber, and a melt joining portion for melt-joining the first molding portion and the second molding portion, A first mold part into which the first molding part that has been molded in advance is inserted; A second mold part adjacent to the first mold part and configured to mold the second molding part; a thermal insulation layer disposed between the first mold part and the second mold part; A mold comprising:

8. The mold according to claim 7, wherein the thermal conductivity of the heat insulating layer is 0.001 to 0.7 W / m·K.

9. A first temperature adjustment unit that adjusts the temperature of the first mold unit; a second temperature adjustment unit that adjusts the temperature of the second mold unit; The mold of claim 7 comprising:

10. A method for producing a molded product using the mold according to claim 7, a first molding step of forming the first molding part having the thermoplastic resin; an inserting step of inserting the first molding part into the first mold part of the mold; A second molded portion molding step of injecting vulcanized rubber into the second mold portion of the mold to form the second molded portion and melt-bonding an end of the second molded portion to the first molded portion. A method for producing a molded body, comprising the steps of:

11. The mold includes a first temperature adjustment unit that adjusts the temperature of the first mold portion and a second temperature adjustment unit that adjusts the temperature of the second mold portion, The method for manufacturing a molded body described in claim 10, wherein the second molding portion molding process is performed while adjusting the temperature of the first mold portion by the first temperature adjustment unit and adjusting the temperature of the second mold portion by the second temperature adjustment unit.

12. The method for producing a molded article according to claim 10, wherein the thermoplastic resin comprises polyethylene.

13. The method for producing a molded body according to claim 12, wherein the temperature of the first mold part in the second mold part molding step is 0 to 130°C.

14. The method for producing a molded body according to any one of claims 10 to 13, wherein the molded body is a glass run.

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