JPH03258285A - Backrest for seat - Google Patents

Abstract

PURPOSE:To cheaply cover all the surfaces of the title backrest and to make rear space larger by forming a peculiar design on the rear surface thereof, by a method where both a concave backrest part on the front surface of a pad and recesses on the rear surface thereof are formed, and almost all the surface except a lower surface are covered with a bag-shaped skin material, and the skin material is stuck on the surfaces of the backrest part and the recesses. CONSTITUTION:The main body of the title backrest 1 is composed of a pad 2 consisting of polyuretane foam-formed product with a cushiony property, and all the surfaces thereof are covered with a bag-shaped skin material 3 having an opening at the lower end thereof. Side support parts 4 protruding forward are formed at both sides on the front surface of this backrest 1, and a concave part between them is made a backrest part 5. A pair of recesses 6, right and left, are also formed on the rear surface of the backrest 1. The skin material 3 is stuck on the pad 2 with a reactant type hot melt adhesive 7 with which both the backrest part 5 on the front surface of the pad 2 and the peripheral part thereof, and the recesses 6 on the rear surface of the pad 2 and the peripheral part thereof, are coated.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to seat backs for automobiles and the like.

(Prior Art) Automobile seat backs in which a skin material is bonded with an adhesive to the front surface of a pad made of a cushion body such as polyurethane foam have been known for a long time. discloses a seat back in which adhesive is applied to the backrest portion in front of the pad, a bag-shaped skin material is covered, the bag-shaped skin material is bonded to the pad with adhesive, and the entire surface is covered with the skin material. ing.

The manufacturing method for the seat back is to first apply hot-melt adhesive, pressure-sensitive adhesive, or other adhesive to the backrest of the bat, and then temporarily lose the adhesive strength of the adhesive. Make it come alive. Specifically, in the case of a hot melt adhesive, a sheet-like or powder-like adhesive layer is formed, then heated and melted, and then cooled and solidified. In the case of a pressure-sensitive adhesive, it is dried after application. Next, after covering this pad with a bag-shaped skin material, in the case of hot-melt adhesive, the adhesive is heated, and then the skin material is pressed onto the pad with a predetermined pressure using a press mold to form a band and skin material. Seat backs are manufactured by gluing and cooling.

(Problem B to be solved by the invention) By the way, in the seat hack disclosed in the above-mentioned publication, by covering the pad with a bag-shaped skin material, it is possible to inexpensively obtain a seat back whose entire surface is covered with the skin material. However, since the skin material is only glued on the front side, even if the skin material can be placed along the indentation of the front backrest, on the back side, the skin material will be stretched and become a flat surface, causing the back of the pad to become flat. Even if a concavo-convex design is formed, it is covered up by the skin material, and there are also problems in that it is not possible to enlarge the front space of the rear seat by forming a concave portion on the back surface of the seat bank.

In view of the above-mentioned conventional problems, the present invention covers the entire surface using a bag-shaped skin material at low cost, and also forms a concave part on the back side, making it possible to form a unique design and to enlarge the rear space. The purpose is to provide a seat back that can be used.

(Means for Solving the Problems) In order to achieve the above object, the seat back of the present invention has a seat back in which a skin material is attached and bonded to the surface of a pad constituting a main body, and a seat back with a recessed surface on the front surface of the pad. At the same time as the backrest is formed, a recess is formed on the back surface, and almost the entire surface of the bat except the bottom surface is covered with a bag-shaped skin material, and at least the backrest and the surface of the recess are covered with an adhesive. It is characterized in that the skin material is adhered to the pad.

(Function) According to the above structure of the present invention, since adhesive is applied to the front backrest part and the recessed part of the back surface of the seat back to adhere the skin material, it is possible to reduce the cost by using the bag-shaped skin material. While covering the entire surface with the skin material, the skin material can be placed along the surfaces of the front backrest and the recesses on the back, forming a recess covered with the skin material on the back as well as the front backrest. This makes it possible to form a unique design and to increase the rear space of the seat back.

(Example) Hereinafter, an example in which the present invention is applied to a seat bank of a front seat for an automobile will be described with reference to FIGS. 1 to 8.

In FIGS. 1 to 3, 1 is a seat back, the main body of which is composed of a pad 2 made of a polyurethane foam molded product with cushioning properties, and the entire surface of the pad 2 is shaped like a bag with an opening at the lower end. It is covered with a skin material 3. Side support parts 4 that protrude forward are formed on both sides of the front surface of the seat back 1, and a recessed part between them is used as a backrest part 5. Furthermore, a pair of left and right recesses 6 are formed on the back surface of the seat back 1.

The skin material 3 is adhered to the pad 2 with a reactive hot melt adhesive 7 applied to the backrest portion 5 on the front side of the band 2 and its surrounding area, and on the recessed part 6 on the back side of the pad 2 and its surrounding area. In FIG. 3, reference numeral 8 denotes a pipe frame as a strength member embedded in the pad 2 and integrally molded.

Next, the manufacturing process of the seat back 1 having the above configuration is carried out in the fourth step.
This will be explained with reference to FIGS. First, as shown in FIG. 4, a reactive hot melt adhesive 7 is sprayed onto the concave backrest portion 5 on the front side of the pad 2, the concave portion 6 on the back side, and their surrounding areas using a spray gun II.

Unlike ordinary hot melt adhesives such as EVA type and polyamide type, the reactive real melt adhesive 7 is hardened by polymer reaction and crosslinking reaction like reactive adhesives such as epoxy type after adhesion. It improves adhesive properties, and has the advantage of improving heat resistance through a curing reaction while taking advantage of the advantages of true-melt adhesives, such as high-speed adhesion and being solvent-free. In other words, since hot melt adhesives do not contain solvents, they do not require drying and can complete the bonding process by being applied to an adherend and then being compressed for the time required for cooling and solidifying, but they have low heat resistance as an adhesive property. There are limits to adhesive strength, etc. On the other hand, although solvent-free liquid reactive adhesives have sufficient heat resistance, it is necessary to fix the adherend until the reaction progresses after adhesion and curing is completed. On the other hand, reactive true-melt adhesives, like true-melt adhesives, can maintain the required minimum strength immediately after cooling and solidifying, and the adhesive properties are improved by reaction curing after adhesion.
This results in an adhesive state with high heat resistance. Such reactive real-melt adhesives include those that are cured by irradiation with ultraviolet rays, electron beams, or heat rays, as well as those that are cured by reacting with oxygen and moisture in the air. In this embodiment, a urethane-based moisture curing type reactive hot melt adhesive 7 whose main component is a urethane prepolymer is used. This reactive hot melt adhesive 7 is heated and melted at a low temperature of about 100° C., and applied with a spray gun 12.

As shown in FIG. 5, the adhesive 7 applied to the required locations is
By allowing up to 60 seconds of oven time after application, a tack-free state can be achieved, so continue with the 6th coating.
As shown in the figure, a bag-shaped skin material 3 is placed on the pad 2 to cover almost the entire front, both sides, back and top surface of the pad 2.

Next, as shown in FIG. 7, the pad 2 with the skin material 3 attached is placed on the jig 12, inserted into the heating device 13 maintained at a high temperature with hot air, and heated for a predetermined time. By doing so, the adhesive 11 is heated to about 60° C. and thermally activated.

Next, the pad 2 with the skin material 3 attached thereto is set on the lower mold 15 of the press device 14, as shown in FIG. ,
The skin material 3 is pressed onto the heat-activated adhesive 7. Lower mold 1
5 has a convex shape corresponding to the backrest portion 5 on the front side of the seat back 1, the upper mold 16 has a convex shape corresponding to the concave portion 6 on the back side of the seat back 1, and the skin material 3 has a convex shape corresponding to the backrest portion 5 on the front side of the seat back 1. The adhesive 7 applied to the backrest portion 5 and the recessed portion 6 of the back surface is reliably bonded to the heat-activated adhesive 7. In addition, the lower mold 15 and the upper mold 16 are heated to a temperature of 10°C to 20°C using appropriate cooling means such as cooling air.
Since it is cooled to about .degree. C., the adhesive 7 is cooled and solidified in the pressed state. Thus, by cooling and solidifying the adhesive 7 with the skin material 3 pressed against the heat-activated adhesive 7, adhesion having a predetermined initial adhesive strength is ensured.

After that, if the pad 2 to which the skin material 3 is glued is removed from the lower mold 15 and left as it is, as time passes, the adhesive 7
reacts with moisture in the air and crosslinks, improving adhesive strength and providing an adhesive state with high heat resistance of 120 to 130°C. As shown in Figures 1 to 3, the surface of the pad 2 The seat back 1 is completed which is integrally covered with the skin material 3.

Since this seat back 1 has a recess 6 formed on the back, it is possible to obtain a seat back with an innovative design, and the space in front of the rear seat becomes larger by the amount of this recess 6, making the space more efficient. You can use it to sit comfortably. Moreover, since almost the entire surface of the pad 2 is covered with the bag-shaped skin material, the number of man-hours required is reduced and manufacturing can be done at low cost. In addition, by using the reactive hot melt adhesive 7 as the adhesive, it is possible to bond by heat activation at a relatively low temperature, thereby preventing whitening or fraying of the skin material 3, and moreover, A desired heat-resistant adhesion can be obtained by subsequent reaction curing.

(Effects of the Invention) According to the seat back of the present invention, since adhesive is applied to the front backrest portion and the recessed portion of the back surface to adhere the skin material, the bag-shaped skin material can be used to inexpensively surface the surface. While covering the entire surface with the skin material, the skin material can be placed along the surfaces of the front backrest and the recess on the back, and the recess covered with the skin material can be formed on the back as well as the front backrest. This has the effect of creating a unique design and increasing the rear space of the seat back.

[Brief explanation of drawings]

Fig. 1 is a perspective view of an embodiment of the seat back of the present invention as seen from the front side, Fig. 2 is a perspective view of the same as seen from the back side, and Fig. 3 is a cross-sectional plan view taken along the line ■-■ in Fig. 2. , FIG. 4 is a perspective view showing the adhesive application process in the manufacturing process of the same seat back, FIG. 5 is a perspective view of the adhesive applied and deactivated, and FIG.
FIG. 7 is a perspective view showing the step of attaching the skin material, FIG. 7 is a sectional view showing the heating step of the adhesive, and FIG. 8 is a partial sectional view showing the pressure bonding step using a press. 1-...-- Seat back 2------1... Pad 3 Outer material backrest recess Reactive folatmelt adhesive

Claims (1)

[Claims] In a seat back in which a skin material is attached and adhered to the surface of the pad that constitutes the main body, a concave backrest is formed on the front of the pad, and a concave portion is formed on the back, and almost all of the surface of the pad except the bottom surface of the pad is recessed. A seat back characterized in that the entire surface is covered with a bag-shaped skin material, and the skin material is adhered to a pad with an adhesive applied to at least the backrest portion and the surface of the recess.