WO2023113121A1

WO2023113121A1 - Seatback board using lwrt

Info

Publication number: WO2023113121A1
Application number: PCT/KR2022/008584
Authority: WO
Inventors: 김희웅; 김동하
Original assignee: 한화첨단소재 주식회사
Priority date: 2021-12-13
Filing date: 2022-06-17
Publication date: 2023-06-22
Also published as: KR20230089121A

Abstract

The present invention relates to a seatback board using LWRT. More specifically, by integrally molding a seat portion and a skin material portion made of an LWRT material of a first row seatback board, an impact on the knees of an occupant seated in a second row seat can be minimized and a sense of unity with a seatback cushion can be given through the integral molding of the skin material portion, thereby enhancing the sense of luxury.

Description

Seat back board using LWRT

The present invention relates to a seat back board using LWRT, and more particularly, by integrally molding the seat portion and the skin portion of the LWRT material of the first row seat back board, the applied to the knees of the occupant seated in the second row seat Impact can be minimized, and a sense of unity with the seatback cushion can be given through integral molding of the skin part to improve the sense of quality.

In general, a seat of a vehicle includes a seat cushion supporting a lower body of a passenger, a seat back supporting an upper body of a passenger, and a headrest that is height-adjustably coupled to an upper portion of the seat back and supports the head and neck of the passenger.

In particular, a seatback includes a seatback frame having a lower end connected to the floor of a vehicle body and maintaining its shape while forming a frame of the seatback, and a seatback cushion surrounding the seatback frame.

In addition, a plate-shaped member installed to cover the rear surface of the seatback frame, that is, a seatback backboard may be further included. The 'seat back board' is also referred to as a 'seat back board' in the industry (hereinafter, referred to as a seat back board in the present invention), which is just a difference in terminology, and is the same part.

FIG. 1 is a view briefly showing the arrangement of seats in the first and second rows of the related art, and FIG. 2 shows the rear surface of the conventional first row seats.

Seats of the vehicle may be divided into a first row seat 1 and a second row seat 2 . As shown in FIG. 1, when the occupant 3 is seated on the second row seat 2, the knee 30 of the occupant 3 is a seatback board coupled to the back of the seatback frame 10 of the first row seat 1. The structure is designed to come into contact with (11).

At this time, it is common that the conventional seat back board 11 is made of plastic injection for cost reduction and light weight. The plastic injection method is widely used because it has some of the above advantages, but it is very hard due to the nature of the plastic injection material, so the knee 30 of the occupant 3 seated on the second row seat 2 is the surface of the seat back board 11. There was a problem that the occupant 3 felt uncomfortable when touching. In addition, there was a case in which the knee 30 of the occupant 3 was seriously injured by colliding with the seat back board 11 during a vehicle collision.

In addition, referring to FIG. 2, due to the material gap between the seatback board 11 formed by plastic injection and the seatback cushion 12 around the seatback board 11 (typically, the seatback cushion 12 is made of polyurethane (PU) ) material), there was a problem that the sense of unity and luxury of the product deteriorated.

In order to overcome this problem, recently, a process of attaching a separate skin material to the surface of the seat back board 11 formed by plastic injection has been developed, but this has a problem of cost and labor cost increase due to an additional process, and the skin material Since the adhesive must be separately applied to attach to the seat back board 11, the tack time is increased, resulting in a decrease in productivity.

In order to achieve the object of the present invention, the seat back board of the seat back board using the LWRT according to the present invention is made of a resin impregnated with glass fibers.

In addition, the seat back board using the LWRT according to the present invention includes a core layer made of a resin impregnated with the glass fiber; a first finishing material layer coupled to an upper portion of the core layer; It is made of a sheet portion having a second finishing material layer coupled to a lower portion of the core layer.

In addition, a skin member coupled to the upper portion of the seat portion of the seat back board using the LWRT according to the present invention; further includes.

In addition, the seat portion and the skin portion of the seat back board using the LWRT according to the present invention are integrally molded.

In addition, the seat portion and the skin portion of the seat back board using the LWRT according to the present invention are pressed and integrally molded by a press process.

In addition, the seat portion of the seat back board using the LWRT according to the present invention is heated through a heating portion, the skin material portion is loaded on the top of the heated seat portion, and is pressed by a mold portion so that the heated seat portion and the skin material portion are combined

In addition, the mold part of the seat back board using the LWRT according to the present invention is combined with an auxiliary mold part imitating the seat back board shape in order to manufacture the seat part and the skin material in the shape of the seat back board.

In addition, the first finishing material layer of the seat back board using LWRT according to the present invention is a PP film.

In addition, the second finishing material layer of the seat back board using LWRT according to the present invention includes a PET material.

In addition, the skin material of the seat back board using LWRT according to the present invention includes PU material.

Since the seat back board according to the present invention is composed of low-weight reinforced thermoplastic (LWRT) composed of resin impregnated with glass fiber, the weight is reduced compared to the conventional seat back board formed by PP injection, and fuel efficiency is increased. There is an advantage to being

In addition, the low-weight reinforced thermoplastic (LWRT) composed of resin impregnated with glass fiber has superior shock absorption capacity compared to the seat back board formed by PP injection, so it relieves the impact on the occupant's knees, has the advantage of being able to relieve the pressure on the knees felt by the seat back board of the first row seat.

In addition, in the event of a collision, the seatback board formed by PP injection can injure the occupant by generating fragments, but according to the present invention, it is not a material that generates fragments that can injure the occupant, so the crash safety is maximized. .

1 is a diagram briefly illustrating a conventional arrangement of seats in

rows

1 and 2.

2 shows the back of a conventional first row seat.

Figure 3 shows a configuration for manufacturing a seat back board according to the present invention.

Figure 4 shows a cross section after completion of the seat back board according to the present invention.

5 shows a process for manufacturing a seat back board according to the present invention.

6 shows a seat back board according to another embodiment of the present invention.

7 shows a seat back board according to another embodiment of the present invention

8 is an enlarged view of the boundary line between the seat back board and the skirt part according to the present invention.

9 shows a state in which a skirt is coupled to a conventional seat back board.

Hereinafter, it will be described in detail with reference to the drawings of the present invention. The embodiments introduced below are provided as examples to sufficiently convey the spirit of the present invention to those skilled in the art. Accordingly, the present invention may be embodied in other forms without being limited to the embodiments described below. And, in the drawings, the size and thickness of the device may be exaggerated for convenience. Like reference numbers indicate like elements throughout the specification.

Advantages and features of the present invention, and methods for achieving them, will become clear with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various different forms, and only these embodiments make the disclosure of the present invention complete, and the common knowledge in the art to which the present invention belongs It is provided to fully inform the holder of the scope of the invention, and the present invention is only defined by the scope of the claims. Like reference numbers designate like elements throughout the specification. The sizes and relative sizes of layers and regions in the drawings may be exaggerated for clarity of explanation.

Terms used in this specification are for describing embodiments, and therefore are not intended to limit the present invention. In this specification, singular forms also include plural forms unless specifically stated otherwise in a phrase. As used herein, "comprise" and/or "comprising" means that a stated component, step, operation, and/or element is the presence of one or more other components, steps, operations, and/or elements. or do not rule out additions.

3 shows a configuration for manufacturing a seat back board according to the present invention, and FIG. 4 shows a cross section of the seat back board according to the present invention after completion. Hereinafter, the configuration and effect of the seat back board according to the present invention will be described with reference to FIGS. 3 and 4.

The seat back board according to the present invention is preferably formed by stacking the seat portion 100 and the skin member portion 200. At this time, as will be described later, the seat part 100 and the skin material part 200 of the seat back board according to the present invention are integrally molded by the press of the mold part 3000, and the seat part 100 is LWRT (Low Weight Reinforced Thermoplastics, low weight). Reinforced thermoplastic) material is preferred.

The sheet portion 100 according to the present invention is composed of a core layer 110, a first finishing material layer 120, and a second finishing material layer 130, and the first finishing material layer 120, the core layer from top to bottom. (110) and the second finishing material layer (130) are preferably sequentially laminated.

At this time, the core layer 110 is preferably a layer made of a resin impregnated with glass fibers. This is also referred to as 'PP-GF core' and is a reinforced thermoplastic composite material. The resin is preferably any one or a mixture of two or more selected from PE, PA, PC, PBT, PET, PPO, and PPE.

The first finishing material layer 120 is laminated and bonded to the upper surface of the core layer 110, and is preferably a PP film, for example. As will be described later, the first finishing material layer 120 is heated and melted by the heating unit 2000, and serves as an adhesive layer connecting the core layer 110 and the skin material 200.

The second finishing material layer 130 is laminated and bonded to the lower surface of the core layer 110, and preferably includes a PET material as an example.

The skin member 200 can be laminated and coupled to the upper surface of the entire sheet portion 100, and preferably includes a polyurethane material as an example. Among the seatback boards of the present invention, it is preferable that the surface of the skin member 200 be located at a portion in contact with the knee 30 of the occupant 3, and thereby, the poly of the seatback cushion 12 surrounding the seatback board. By equating the material with the urethane material, a sense of aesthetics may be imparted, and impact transmitted to the knee 30 may be minimized.

At this time, it is preferable that the seat portion 100 and the skin member portion 200 are integrally molded by pressing the mold portion 3000 to form a seat back board, which will be described in detail later.

Therefore, the seat back board 300 completed as shown in FIG. 4 is manufactured by integrally molding the seat portion 100 and the skin member portion 200. As described above, conventionally, in order to attach the skin material to the PP injection seat back board 11, a separate adhesive is applied to the surface of the seat back board 11 to attach the skin material. As a result, productivity decreases, and a problem of cost and labor cost increase due to manpower input into the additional process occurs, and the skin material is attached while the seat back board 11 is already coupled to the seat back frame 10 of the vehicle. Therefore, there was a problem that quality deterioration occurred.

However, according to the present invention, since the seat portion 100 and the skin portion 200 are integrally molded from the initial stage of producing the seat back board, productivity is maximized, and cost and labor costs are reduced, and at the same time, the seat back frame 10 ) Since the skin material is formed before bonding, it has the advantage of improving product quality.

As described above, the sheet portion 100 according to the present invention is a low-weight reinforced thermoplastic material (LWRT) composed of a resin impregnated with glass fibers. Since the material properties of the low-weight reinforced thermoplastic material (LWRT) itself are a well-known technology, a detailed description thereof will be omitted.

The seatback board made of low-weight reinforced thermoplastic material has excellent strength-to-weight ratio, excellent shock and noise absorption, and can be trimmed to improve assembly and design freedom. In addition, it has an excellent advantage in improving the fuel efficiency of vehicles due to its low weight, and also has an advantage in terms of environment-friendliness because it uses a thermoplastic resin and does not use an adhesive. In addition, there is also an advantage that the life is increased by having excellent corrosion resistance.

Therefore, since the seat back board according to the present invention is composed of a low weight reinforced thermoplastic material (LWRT) composed of a resin impregnated with glass fiber, the weight is reduced compared to the seat back board formed by conventional PP injection molding, resulting in reduced fuel efficiency. has the advantage of increasing

In addition, the low-weight reinforced thermoplastic (LWRT) composed of resin impregnated with glass fiber has superior shock absorption capacity compared to the seat back board formed by PP injection, so it relieves the impact on the occupant's knees, It has the advantage of being able to relieve the pressure (hardness) of the knee 30 felt by the seat back board of the first row seat.

5 shows a process for manufacturing a seat back board according to the present invention. Hereinafter, with reference to FIG. 5, a process of manufacturing a seat back board according to the present invention will be described.

The seat back board according to the present invention is composed of the following steps.

1) loading the sheet portion;

2) penetrating the heating part;

3) supplying the skin material;

4) Pressing the mold unit;

5) Trimming step.

1) Step of loading the sheet part

This step is a step of loading the sheet portion 100, which is sequentially stacked and combined with the first finishing material layer 120, the core layer 110, and the second finishing material layer 130, on the main conveyor extending in the longitudinal direction. In order to load the main conveyor, a first auxiliary conveyor 1000 crossing the main conveyor vertically may be formed as shown in FIG. 5 .

2) penetrating the heating unit;

This step is a step in which the seat part 100 moving along the main conveyor passes through the heating part 2000 . Therefore, it is preferable that the main conveyor extending in the longitudinal direction also crosses the heating unit 2000, and the seat unit 100 is heated by the heating unit 2000. At this time, the first finishing material layer 120 formed of, for example, a PP film is melted by heating and serves as an adhesive.

The seat part 100 passing through the heating part 2000 reaches the mold part 3000 along the main conveyor.

3) supplying the skin material;

This step is a step of supplying the skin material part 200 to the upper part of the seat part 100 located in the mold part 3000 . The skin member 200 may be supplied by, for example, a second auxiliary conveyor 4000 crossing the main conveyor so as to be perpendicular to it, as shown in FIG. 5 .

4) Pressing the mold unit;

This step is a step in which the mold part 3000 presses the sheet part 100 in a state where the skin material part 200 is loaded. As described above, the first finishing material layer 120 is heated by the heating unit 2000 to act as an adhesive, and the sheet unit 100 and the skin unit 200 are integrally formed by pressing the mold unit 3000. do.

At this time, as shown in FIG. 3, the mold part 3000 may be composed of an upper mold part 3100 and a lower mold part 3200, for example, and the seat part 100 and the skin material part 2000 are the upper mold part 3100 and It is located between the lower mold part 3200.

In addition, auxiliary mold parts may be coupled to the lower part of the upper mold part 3100 and the upper part of the lower mold part 3200, and each auxiliary mold part is referred to as the auxiliary upper mold part 3110 and the auxiliary lower mold part 3210.

At this time, it is preferable that the auxiliary upper mold part 3110 and the auxiliary lower mold part 3210 have shapes imitating the shape of the seat back board 300 to be completed. Through this, only by pressing the mold unit 3000, the seat portion 100 and the skin member portion 200 can be integrally molded, and at the same time, the shape of the seat back board 300 can be manufactured, increasing work efficiency. There are advantages. This is an efficient process that shortens the working time compared to the conventional PP injection method.

5) Trimming step.

This step is a process of processing a hole (not shown) required for combining the completed seatback board 300 with other parts (for example, a seatback frame) through the trimming tool 5000. Through the trimming step, the seat back board 300 is finally completed.

6 shows a seat back board according to another embodiment of the present invention. Hereinafter, a seatback board according to another embodiment of the present invention will be described with reference to FIG. 6 .

In the seat back board according to another embodiment of the present invention, a plurality of ribs 310 are formed near the surface where the knees of the occupant come into contact. Due to the configuration of the rib 310, there is an effect of reinforcing rigidity. At this time, as described above, the rib 310 is manufactured by changing the shape of the auxiliary upper mold part 3110 and the auxiliary lower mold part 3210. It is manufactured by forming a structure corresponding to the rib 310 at the position of the auxiliary upper mold part 3110 and the auxiliary lower mold part 3210 that come into contact with the part where the rib 310 is to be formed (for example, the auxiliary upper mold part 3110 The rib 310 is manufactured by making it concave and protruding the auxiliary lower mold part 3210). In order to manufacture such a rib 310, a separate process is unnecessary, and it can be manufactured only by changing the shape of the auxiliary upper mold part 3110 and the auxiliary lower mold part 3210, which has the advantage of improving productivity.

7 shows a seat back board according to another embodiment of the present invention. Before describing a seatback board according to another embodiment of the present invention, reference is made to FIG. 9 . 9 shows a state in which the skirt 13 is coupled to the conventional seat back board 11.

The skirt is attached to the lower part of the seat back board, and is located between the seat back board and a part spaced apart from the bottom surface of the vehicle to prevent external exposure of the rear lower part of the seat.

In the conventional case, as shown in FIG. 9 , it is common that the skirt 13 is coupled to the lower portion of the seat back board 11 in a non-woven fabric coupling form. However, the skirt 13 is a place where the feet or ankles of occupants seated in the second row seat come into contact, and there is a problem in that the skirt 13 is separated from the seatback board 11 due to frequent friction. This is because separation is easy due to the nature of the nonwoven fabric bonding.

The reason why the seat back board and the skirt cannot help but be coupled in the form of a non-woven fabric is that the skirt 13 has to be inclined and extended toward the bottom surface of the vehicle (this relates to the characteristics of the skirt product). If injection is performed from the seat back board 11 formed by conventional PP injection to the sloped skirt 13, a boundary line between the seat back board 11 and the skirt 13 is formed, and the boundary line is the material characteristic of PP injection. Since it is broken due to the rigidity based on, inevitably, a sheet-type skirt 13 is separately manufactured and combined with a non-woven fabric.

However, the seatback board according to another embodiment of the present invention is manufactured by integrally molding the skirt portion 400 and the seatback board 300, and both the skirt portion 400 and the seatback board 300 are LWRT materials. Since the LWRT material has ductility compared to conventional PP injection molding, the possibility that the boundary line 500 between the seat back board 300 and the skirt portion 400 is broken is significantly reduced.

Due to this, since the skirt 13 does not need to be separately manufactured and attached to the seat back board 11 as in the prior art, a separate process for manufacturing the skirt is unnecessary, so productivity is improved and labor costs are reduced. In addition, there is an advantage in that the problem of the skirt being separated from the seatback board due to the nonwoven fabric bonding method during use can be fundamentally solved by integral molding.

8 is an enlarged view of the boundary 500 between the seat back board 300 and the skirt portion 400 according to the present invention.

The boundary line 500 according to the present invention includes a first convex portion 510, a second convex portion 520, a first concave portion 530, a second concave portion 540, a third convex portion 550, and a second convex portion 550. It is preferable to include 4 convex portions 560 .

When the boundary line 500 is viewed in cross section, the first convex portion 510 and the second convex portion 520 protrude and are rounded (downward with reference to FIG. 8), and the first convex portion 510 and the second convex portion 510 A first concave portion 530 is extended and positioned between the convex portions 520 . The first concave portion 530 is recessed in a direction opposite to the protruding direction of the first convex portion 510 and the second convex portion 520 (upward with reference to FIG. 8 ).

The first convex portion 510 extends from the seatback board 300 and the second convex portion 520 extends from the skirt portion 400 .

The second concave portion 540 faces the first concave portion 530 at a predetermined interval and is recessed in the opposite direction to the first concave portion 530 (downward direction with reference to FIG. 8 ). In addition, a third convex portion 550 and a fourth convex portion 560 are formed extending from both ends of the second concave portion 540, and the third convex portion 550 and the fourth convex portion 560 protrude. Round loses (upward based on FIG. 8). In addition, the third convex portion 550 extends from the seatback board 300 and the fourth convex portion 560 extends from the skirt portion 560 .

Due to the above configuration, in the boundary line 500, the part extending (that is, in contact with) the seat back board 300 and the skirt portion 400 is convex to the maximum to increase the cross-sectional area and change the angle. The section was concave as much as possible to reduce the cross-sectional area.

In more detail, the boundary line 500 extending from the seat back board 300 is formed with a first convex portion 510 and a third convex portion 550, and is convex in a direction away from each other to maximize the cross-sectional area. And, the boundary line 500 extending from the skirt portion 400 is formed with a second convex portion 520 and a fourth convex portion 560, and similarly convex in a direction away from each other to secure a maximum cross-sectional area. Due to this, since the cross-sectional area (thickness) of the joint point with the boundary line 500 is increased, there is an advantage in that life is increased.

In addition, the first concave portion 530 and the second concave portion 540 are formed between the above two portions, and are recessed in a direction closer to each other to minimize the cross-sectional area. Since the part where the angle change occurs is the part where bending occurs, when the seat back board 300 and the skirt part 400 are bent, if the cross-sectional area (thickness) of the corresponding part is minimized, the bending is induced as much as possible to stress in both directions. can be distributed. Therefore, as in the present invention, the structure of the first concave portion 530 and the second concave portion 540 has the advantage of minimizing the breakage of the boundary line 500 by distributing the stress, and the advantage of increasing the product lifespan. there is

Although the detailed description of the present invention described has been described with reference to preferred embodiments of the present invention, those skilled in the art or those having ordinary knowledge in the art will find the spirit and spirit of the present invention described in the claims to be described later and It will be understood that the present invention can be variously modified and changed without departing from the technical scope. Therefore, the technical scope of the present invention is not limited to the contents described in the detailed description of the specification, but should be defined by the claims.

Claims

In the seat back board of the first row seatback where the knees of the occupants seated on the second row seats touch,

The seat back board is made of a resin impregnated with glass fibers.

Seat back board using LWRT.
According to claim 1,

The seat back board,

a core layer made of a resin impregnated with the glass fibers;

a first finishing material layer coupled to an upper portion of the core layer;

A sheet portion having a; second finishing material layer coupled to the lower portion of the core layer; which is made of

Seat back board using LWRT.
According to claim 2,

Further comprising a; skin member coupled to the upper portion of the sheet portion

Seat back board using LWRT.
According to claim 3,

The sheet portion and the skin material portion are integrally molded

Seat back board using LWRT.
According to claim 4,

The sheet portion and the skin material portion are pressed by a press process and integrally molded.

Seat back board using LWRT.
According to claim 5,

The seat portion is heated through the heating portion,

The skin material portion is loaded on the top of the heated sheet portion, and pressed by the mold portion to couple the heated sheet portion and the skin material portion.

Seat back board using LWRT.
According to claim 6,

The mold part,

In order to manufacture the seat portion and the skin material portion in the shape of a seat back board, an auxiliary mold part imitating the shape of the seat back board is coupled

Seat back board using LWRT.
According to claim 2,

The first finishing material layer is a PP film

Seat back board using LWRT.
According to claim 2,

The second finishing material layer is to include a PET material

Seat back board using LWRT.
According to claim 3,

The skin material is to include a PU material

Seat back board using LWRT.