JP3890399B2 - Manufacturing method for vehicle seat - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for manufacturing a vehicle seat that can efficiently produce a skin-integrated sheet that is free from hair collapse and pad crushing and that has an excellent surface softness.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, as a method for manufacturing an automobile seat in which a skin material is integrally formed on the surface of a cushion pad, as shown in, for example, JP-A-61-176387, the cushion pad surface is made of thermoplastic resin fibers. It is known that a heat-sensitive adhesive cloth is stacked, and a skin material is heated and pressed with a heating die from above, and the heat-sensitive adhesive cloth is fused and integrated with the surface of the cushion pad by melting the heat-sensitive adhesive cloth. .
[0003]
However, in the conventional method for manufacturing a vehicle seat of this type, since the skin material is heated and pressed by a heating mold, there is a problem that the skin material having raised hair is likely to fall down due to heat and pressure, and the cushion. There was a problem that the pad was plastically deformed and crushed. In addition, since heat conduction to the heat-sensitive adhesive cloth is poor, it is necessary to take a sufficient time for heating, so that the molding efficiency is inferior and the skin material is deteriorated by heat. Furthermore, there is a problem in that the adhesive is present as a large lump and there is no soft feeling and the sitting comfort may be remarkably lowered.
[0004]
[Problems to be solved by the invention]
The present invention solves the conventional problems as described above, does not cause the fall of the skin material and the cushion pad, and the adhesive is dispersed in a dot shape to ensure an excellent soft feeling. The present invention has been completed for the purpose of providing a method for manufacturing a vehicle seat that can efficiently produce an integrated skin sheet.
[0005]
[Means for Solving the Problems]
In order to solve the above-described problems, the vehicle seat manufacturing method of the present invention includes a thermosensitive adhesive comprising a thermoplastic resin fiber between a lower mold on which a skin material is placed and an upper mold that holds a cushion pad. by interposing a fabric, that is heated by the heating steam from the lower die cushion pad held in the upper mold in a state where the cushion pad surface is moved close position to not collapse to melt the thermosensitive adhesive fabric web of heat sensitive The adhesive cloth is made into an adhesive that disperses uniformly and is then clamped to press and adhere the skin material to the cushion pad via the dotted adhesive. it is characterized in that integrally molded skin material to the cushion pad by sucking and cooling from the lower die by solving the clamping.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
The drawings show a case where an automobile seat in which a skin material made of a fabric is integrally formed on the surface of a cushion pad made of polyurethane is shown, wherein 1 is a lower mold for placing the skin material 20 2 is an upper mold for holding the cushion pad 21, 3 is a clamper for attaching and holding the skin material 20 on the upper surface of the lower mold 1, and 22 is for bonding the skin material 20 to the cushion pad 21. It is a heat-sensitive adhesive cloth interposed between the two.
[0007]
In the present invention, as shown in FIG. 3, the heat-sensitive adhesive cloth 22 is a web-like material made of thermoplastic resin fibers, has a melting point of 80 to 120 ° C., and is easily melted by a heating process described later. Both are securely bonded. The viscosity when the heat-sensitive adhesive cloth 22 is heated and melted is less than 200 pa.s (at 160 ° C.) or less, preferably about 50 to 150 pa.s (at 160 ° C.). It exhibits excellent fluidity in the bonding process between the material 20 and the cushion pad 21 and is uniformly dispersed and impregnated over the entire surface to exhibit a strong adhesive force.
[0008]
Next, the molding process of the present invention will be described.
By pressing and heating the upper mold 2 holding the cushion pad 21 to the lower mold 1 on which the skin material 20 is placed through a heat-sensitive adhesive cloth 22 made of thermoplastic resin fibers, the skin material is integrally formed on the cushion pad. The point that the vehicle seat is formed is similar to the conventional method of manufacturing this type of vehicle seat, and in the present invention, the bonding integration of the cushion pad and the skin material is a heating step. And it has the characteristic in the point made into the three-step process of a compression process and a cooling process.
[0009]
That is, in the heating step, the heat-sensitive adhesive cloth 22 is melted by heating the cushion pad 21 held on the upper mold 2 from the lower mold 1 in a state close to a position where the surface of the cushion pad 21 is not crushed. Note that steam supplied from a steam supply port 4 provided in the lower mold 1 is used as a heating source, and the heat-sensitive adhesive cloth 22 is heated through a large number of through holes 6 formed in the lower mold 1. In this heating step, the steam supplied from the lower mold 1 is sufficiently transmitted to the heat-sensitive adhesive cloth 22, so that the heating time can be shortened compared to the conventional case and the deterioration of the skin material 20 can be minimized. .
[0010]
In this heating process, the heat-sensitive adhesive cloth 22 is heated and melted, but when melted, the viscosity is 200 pa.s or less as compared with the conventional one having a viscosity of about 600 pa.s (in the case of 160 ° C.). Yes, it exhibits excellent fluidity in the bonding process between the skin material 20 and the cushion pad 21 in the next process, so that the ground yarn of the skin material can be easily impregnated, and is uniformly dispersed and impregnated over the entire surface of the skin material 20 for strong adhesion. It will demonstrate its power. As shown in FIG. 4, the melting process of the heat-sensitive adhesive cloth 22 is as follows. (A) A web-like material is cut into a state where (b) the skin material or the like is in contact with the (b) skin material or the like. It agglomerates and forms dots toward the contacts. As a result, since the adhesive is finely and uniformly dispersed on the entire surface of the skin material 20, the adhesive does not exist as a large lump as in the conventional case, and there is no soft feeling and the sitting comfort is not significantly reduced.
[0011]
Next, in the compression step, the upper mold 2 is further lowered to press and adhere the skin material 20 to the cushion pad 21. At this time, since the supply of the heating steam has been completed, the skin material 20 is not heated and the occurrence of hair fall due to heat is eliminated as in the prior art.
[0012]
Finally, in the cooling step, the upper die 2 is again sucked and cooled from the lower die 1 in a state where the upper die 2 is raised to a position where the surface of the cushion pad 21 is not crushed again. Note that this cooling is performed by cooling the skin material 20 through a large number of through holes 6 formed in the lower mold 1 by suction cooling with an air suction port 5 provided in the lower mold 1. At this time, since the upper mold 2 is not pressed, the skin material 20 is not compressed, and the occurrence of hair fall due to heat as in the prior art is eliminated. After that, after opening the mold according to a conventional method, the product is released and prepared for the next production, and thereafter the skin-integrated sheet is efficiently produced by the same procedure.
[0013]
【The invention's effect】
As is apparent from the above description, the present invention does not cause the hair material to fall down or the cushion pad to be crushed, and the adhesive is dispersed in a dot shape to ensure an excellent soft feeling. It is possible to efficiently produce a skin-integrated sheet.
Therefore, the present invention greatly contributes to industrial development as a method for manufacturing a vehicle seat that eliminates the conventional problems.
[Brief description of the drawings]
FIG. 1 is a front view showing an embodiment of the present invention.
FIG. 2 is a front view showing an embodiment of the present invention.
FIG. 3 is a perspective view showing a heat-sensitive adhesive cloth.
FIG. 4 is an explanatory view showing a melting process of a heat-sensitive adhesive cloth.
[Explanation of symbols]
1 Lower mold 2 Upper mold
20 Skin material
21 Cushion pad
22 Heat-sensitive adhesive cloth

Claims (2)

Position by interposing a heat-sensitive adhesive fabric comprising a thermoplastic resin fibers, the cushion pad held in the upper mold is the cushion pad surface not collapse between the upper mold holding the lower mold and the cushion pad is placed skin material Heated with heating steam from the lower mold in the state of being in close proximity to melt the heat-sensitive adhesive cloth to make an adhesive that uniformly disperses the web-like heat-sensitive adhesive cloth, and then mold-clamp and cushion via the adhesives the dot of the pad is pressed against and bonding the skin material, then the skin material to the cushion pad by sucking and cooling from the lower die by solving the clamping to a position where the cushion pad surface is not crushed A method for producing a vehicle seat, wherein the vehicle seat is integrally molded .   The method for producing a vehicle seat according to claim 1, wherein a heat-sensitive adhesive cloth having a viscosity of 200 pa.s or less is used.

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