JP6677481B2 - Chair and chair seat manufacturing method - Google Patents

Description

  The present invention relates to a well-balanced chair having good cushioning properties while firmly supporting a seat portion and a backrest portion. In particular, the present invention relates to a chair that easily fits a variety of body shapes of a user.

  It is preferable that the seat or backrest of the chair be curved into a shape corresponding to the contour of the back, waist, or buttocks, and the curved portion fits and fits a required part of the occupant's body and enhances sitting comfort.

  Therefore, various chairs have been devised which have elasticity and can be freely deformed so as to match the body shape of the person. For example, a chair in which a soft cushioning material is overlapped on a hard portion of a seat or backrest finished in a predetermined shape is well known.

Japanese Patent No. 4067283 JP 2010-154879 A

  If the cushion material enhances the load absorbing effect and is deformed so as to follow the body shape, the back and waist are rather deformed, resulting in a burden, and long-term use may cause sitting fatigue.

  In addition, there is also a problem that the seat is hard and the seat is uncomfortable due to the touch from the hard part of the seat and the back.

  Moreover, the body shape varies from person to person, and the prepared chair is not always comfortable for the person. This is particularly noticeable when the chair seat and backrest are made of a hard material.

  An object of the present invention is to provide a chair having a new structure capable of supporting a body while maintaining a basic shape of a chair seat or a backrest and exhibiting appropriate cushioning properties.

  Furthermore, the present invention has a new structure that can wrap the body firmly from the waist of the backrest, the buttocks, the back of the thigh, and even from the waist to the back of the thigh, while widely dispersing the load and supporting the whole. The purpose is to provide a chair.

  The chair of the present invention comprises at least a first sheet layer made of a mesh-shaped thermoplastic resin and a second sheet layer made of a thermoplastic resin thermally fused to each surface of the first sheet layer. A backrest or a seat having a shape corresponding to the shape of the chair frame, or a pressed sheet composite layer having a backrest and a seat, and a surface adhered to the surface of the pressed sheet composite layer, A pressed cushion layer made of a thermoplastic resin having a concave portion from the waist portion of the backrest, or from the buttocks of the seat to the back of the thigh, or from the waist of the backrest to the back of the thigh of the seat. .

  Further, the chair of the present invention has a plurality of holes formed along the chair frame in the pressed sheet composite layer, and the pressed sheet composite layer is fixed to the chair frame through the holes. The pressed cushion layer is supported by the pressed sheet composite layer.

  Due to the connection effect spread closely in a net shape by the fusion of the pressed sheet composite layer, the load is dispersed and the high strength required for the chair sheet despite the thin chair seat is received, and the ideal pressure resistance that can be received as a whole Demonstrate distribution. In addition, since one surface of the pressed sheet composite layer and one surface of the pressed cushion layer are adhered, the cushion layer is firmly supported. Therefore, even when a partial load is applied to the cushion layer, the interaction between the cushion layer and the pressed sheet composite layer disperses the load withstand pressure to give the user a dispersed repulsive force, and furthermore, the base pressing process The basic shape of the seat composite layer is not lost, thereby preventing the entire chair seat from being extremely deformed and improving the user's feeling of use.

  This is effective even when the user's body shape is different or the position is shifted while sitting, as long as the entire seat is not extremely deformed even when the weight position changes, It changes the seat according to the person's body type and weight, and does not make the user feel stiff.

  In other words, the concave surface of the seating surface and backrest surface that is the pressure receiving surface is formed firmly, and the load received from the waist, buttocks, and the back of the thigh is pressed without damaging the shape of the chair as a chair Pressing the cushion layer and its base material The seat surface or backrest surface that can be firmly received by the balanced deflection obtained from the seat composite layer is formed, so that the load spreads all over while generating a slight deflection according to the body shape of the user Thus, the user can receive the feeling of being firmly wrapped and supported over the entire contact surface without receiving a hard feeling from the chair.

  The thermoplastic resin used in the present invention can be a vinyl polymer or a condensation polymer. For example, the vinyl polymer may be selected from the group consisting of polyethylene, polypropylene, polystyrene, and polyvinyl chloride, and the condensation polymer may be selected from the group consisting of polyester and polyamide.

  Further, in the present invention, a) a first sheet layer made of a mesh-shaped thermoplastic resin and second and third sheet layers made of a thermoplastic resin layer provided on each surface of the first sheet layer are provided. A backrest or a seat along the shape of the chair frame is punched into the heat-sealed sheet composite layer, or the backrest is punched into a shape corresponding to the shape of the seat, and the punched sheet composite layer is heated. Pressing and deforming to form a surface along the frame of the chair in a softened state, and then cooling and solidifying; and b) applying heat to the cushion material made of thermoplastic resin to soften it. Pressing and deforming to form the surface of the chair in the folded state, and then cooling and solidifying; c) bonding the pressed sheet composite layer and the pressed cushion material. And step consists of a chair seat manufacturing method.

  In particular, the press machine used in step a) and the press machine used in step b) may be the same machine, and different form adapters for molding the sheet composite layer and the cushioning material in each step. used.

  The seat composite layer pressed by the above-mentioned chair seat manufacturing method is fixed to a chair frame, and the surface of the pressed cushion material is adhered to one surface of the seat composite layer in the fixed state so as to be bonded. Can also be formed.

  Further, the mold of the press machine has a surface in which a pair of molds fit together along the edge of the sheet to be compression-molded, and the edge of the molded cushion material is formed. The edges with the layers can be matched.

1 is an overall front perspective view of a chair 1 according to the present invention. 1 is an overall rear perspective view of a chair 1 according to the present invention. It is sectional drawing which shows the attachment structure of the seat | frame S of the chair 1, and the chair frame 4. FIG. 4 is a conceptual diagram showing a mounting structure using a mounting tool 5 for mounting a seat S to a chair frame 4. It is a development view to each sheet 2a, 2b, and 2c which constitutes composite layer 2 of sheet S. It is a conceptual diagram which shows the structure of the thermocompression bonding apparatus 10 for superposing | stacking several sheets which comprise the composite layer 2, compressing and heat-sealing, and forming an integrated sheet composite layer. The state after punching out the composite layer according to the shell shape of the sheet S is shown. An example is shown in which a pipe 16 for imparting a kinks before pressing the cushion layer 3 is used. 1 shows a press forming apparatus 20 for producing a pressed sheet composite layer or a pressed cushion layer in which a sheet composite layer or a cushion layer is pressed into a shell shape. FIG. 2 is a front view of a mold 22 of the press molding device 20.

The structure of the chair according to the present invention will be described with reference to the drawings.
FIG. 1 is an overall front perspective view of a chair 1 according to the present invention, and FIG. 2 is an overall rear perspective view. FIG. 3A is a cross-sectional view showing a mounting structure of the seat S of the chair 1 and the chair frame 4, and FIG. 3B is a mounting using a screw which is an example of a mounting tool 5 for mounting the seat S to the frame of the chair 1. It is a figure which showed the method typically.

  The chair 1 includes a chair frame 4 and a seat S to which the chair frame 4 is attached.

  In this example, the seat S is bent from the seat portion of the chair 1 to the backrest, and is attached to the chair frame 4 via the attachment 5 at a plurality of positions of the seat portion and the backrest.

  More specifically, with reference to FIGS. 3A and 3B, the sheet S has a configuration in which a pressed sheet composite layer 2 and a pressed cushion layer 3 are stacked and bonded. The screw 5 as an example of the fixture 5 is screwed into the screw hole provided in the frame 4 through the tip of the screw into the hole 2d formed in the pressed sheet composite layer 2, and the head of the screw 5 is pressed into the pressed sheet composite layer. 2, the pressed sheet composite layer 2 is fixed to the frame 4.

  The seat S of the chair 1 of the present invention has a mesh-shaped first sheet made of a thermoplastic resin as a core material of the sheet composite layer 2 and a second sheet fixed to both surfaces thereof, as will be described in detail in a later manufacturing method. A pressed sheet composite layer 2 made of a third sheet and formed into a three-dimensional shape by pressing according to the shape of the frame 4 of the chair 1, and a surface of the pressed sheet composite layer 2 on which a user sits It has a structure in which a pressed cushion layer 3 molded into a three-dimensional shape by pressing so as to be able to adhere to the surface of the third sheet on the side is adhered.

  The pressed sheet composite layer 2 and the pressed cushion layer 3 are selected from thermoplastic resin materials that have stronger elasticity at normal use at normal temperature than at higher temperatures. Therefore, a substantially flat thermoplastic resin material is heated and pressed in a highly deformable state, and then cooled and solidified to form a pressed sheet composite having a mold conforming to the shell shape shown in the chair 1. Layer 2 and pressed cushion layer 3 can be made.

  In this example, the seat S is shown as being integrally molded from the backrest to the seat. However, only the seat or only the backrest may be individually molded. Although not shown here, a seat having a desired color and surface feel can be provided as the chair 1 by attaching a thin cover to the entire or partial seat S.

  The first sheet, which is the core material of the composite layer 2 before processing, is a mesh-like thermoplastic resin, and the thickness of the melted resin after the heat fusion is joined unevenly (note that this fusion bonding is not performed). The state of having spread to a non-uniform thickness is also conveniently replaced with the term "mesh or mesh-like" for ease of explanation.) Further, the interaction between the molded composite layer 2 and the cushion layer 3 makes it possible to support the load firmly while the force applied to the sheet S is widely dispersed. Since the ideal withstand pressure distribution is exhibited, it is possible to provide a shape that easily conforms to the shape of the user while having cushioning properties.

  In other words, the three-dimensional shape of the seat S of the molded chair 1 is formed by the thermoplastic base material and the cushioning layer formed in conformity with the shape of the base material by utilizing the characteristics of the thermoplastic resin. The distribution of the force is ensured by the mesh-like action while ensuring the ideal shape, and even if the sheet S is thin, the shape is not extremely collapsed, and the appropriate repulsive force is returned to the user. Comfort is improved.

  Further, the basic shape of the sheet S and the cushion layer corresponding to the deformability make it possible to secure the balance between the gradual generality and the deformability according to the dispersion of the force, while maintaining the basic elasticity. As a result, it became possible to provide a very well-balanced shell structure, which is important for a chair, and can be adapted to different shapes for each person while maintaining the basic shape. .

  Therefore, the seat S of the chair 1 can be deeply drawn so that a concave portion conforming to the shape of the human body is formed from the waist to the back of the thigh so as to more closely match the human body shape.

  This deep drawing is provided in advance in a press working die described later, and it is possible to perform deep drawing formed by the die, and since the shape can be secured even after molding, an ideal sheet is formed. The structure can be easily provided, whereby the burden on the waist is less likely to be exerted, and the chair 1 having a shape that is less tiring even when used for a long time can be provided.

  In the example of the chair 1, the thermoplastic resin of the first sheet used as the mesh is made of polyethylene, and the second and third sheet layers sandwiching the thermoplastic resin, and the cushion layer are made of cotton containing polyester as a main component. Fibers that intersect in a shape are used. By using the sheet S mainly composed of cotton-like fibers of polyester, components such as heat and sweat generated from the body are ventilated from the sheet S without hindering the temperature of the body. In addition, since the thickness of the sheet S that can withstand the weight of the human body can be reduced, high air permeability that cannot be realized with other sheets can be secured.

  Further, even with a thin sheet structure, load resistance and appropriate deformability can be maintained, so that weight reduction can be realized. Weight reduction is one of the very important functions as a tool to be used, and it is easy to handle in all aspects of manufacturing, transportation and use. In the case of disposal, recycling can be achieved by using a thermoplastic material such as polyester as the material to be used.

Next, a method for manufacturing the chair 1, particularly the seat S, will be described.
First, a description will be given of a method of manufacturing the base sheet 2 (the same reference numeral will be described as corresponding to the pressed sheet composite layer) to be the pressed sheet composite layer 2.

  Referring to FIG. 4, the base sheet 2 includes a core sheet 2a and two surface sheets 2b and 2c sandwiching the core sheet 2a from both sides.

  The core sheet 2a is made of a thermoplastic resin, in this example, polyethylene and meshed to form a sheet having a thickness of about 4 mm, and the surface sheets 2b and 2c are made of cotton-like fibers of polyester, respectively. It is a sheet of about 4 mm.

  The surface sheets 2b, 2c and the core sheet 2a are placed on the surface of the thermocompression bonding plate 11b of the thermocompression bonding apparatus 10 in a state of being overlapped. The thermocompression bonding apparatus 10 includes thermocompression bonding plates 11a and 11b having flat surfaces opposed to each other, and is configured to be pressed between the thermocompression bonding plates 11a and 11b. The heater 12 is embedded in the thermocompression plates 11a and 11b so as to emit heat from the surface of the thermocompression plates 11a and 11b.

  The thermocompression bonding apparatus 10 has a temperature controller 15 so that a constant or a certain range of heat can be applied to the base sheet 2, and can further press the base sheet 2 with a constant or a certain range of pressure. , A pressure controller 14 that senses and controls the pressure, or may be able to control how thick it is.

  In addition, various controllers such as a pressure controller 14, a temperature controller 15, and a thickness controller (not shown) are controlled so that a target pressure and a thickness and a temperature at the time of compression can be applied in a fixed time or a certain range of time. A centralized controller 16 may be provided.

  The base sheet 2 placed while being managed by the various controllers 14 is pressed while heat is applied from both sides of the thermocompression bonding plates 11a and 11. The core sheet 2a of the base sheet 2 is melted by heat at a melting temperature or higher, and the melted material of the core sheet 2a that has been melted penetrates into the surface sheets 2b and 2c, so that the base sheet 2 and the surface sheets 2b and 2c melt. Be worn. In this example, the fusion was performed at a temperature of 180 ° C. and a time of 1.5 to 2 minutes.

  The thermocompression bonding apparatus 10 applies a temperature and a pressure sufficient to ensure the fusion, and then the thermocompression plate 11a is retracted to provide a fusion sheet 2 on which a plurality of sheets are fixed.

  The thickness of the fused sheet 2 obtained from the base sheet was approximately 4.0 to 4.5 mm. The thickness can be appropriately selected, but is preferably in a predetermined range, more preferably, the thickness of the fused sheet 2 is about 3.0 mm to 5.5 mm, and more preferably, about 3.5 mm to 5.0 mm. It is.

  If the thickness of the fused sheet is too small, it is difficult to handle the work of fitting the mold in a press process to be described later, and if it is too thick, the deformability deteriorates, and the fitting is performed so as to match the mold. It becomes difficult, and it is against weight reduction.

  When observing the cross section of the fusion sheet, the mesh sheet portion of the core material is melted and spreads on the surface sheets 2b and 2c, and further spreads in the plane direction to extend, so that the core material is thicker, thinner, or cored. It was observed that the portion without the material was present periodically. Whether the core material spreads thinly or the portion without the core material remains and fused is considered to depend on the heat, pressure and time of the melting.

  For the production of this series of fused sheets 2, Patent No. 4067283 can be used.

  Patent No. 4067283 discloses an arbitrary area formed of one of cloth, felt, plastic foam, leather, synthetic leather or non-woven fabric on one or both surfaces of a thermoplastic mesh serving as a core material or a reinforcing material. The sheet-shaped article is arranged and thermoformed, the surface of the thermoplastic plastic mesh is softened, and entangled with the eyes of the sheet-shaped article, the thermoplastic plastic mesh and the sheet-shaped article are formed. It discloses a step of fusing and integrating.

  Therefore, it is also possible to adopt a method of fusing and integrating a mesh and a sheet-like article made of a thermoplastic plastic according to Patent No. 4067283, or a method other than fusing the mesh-like sheet and the sheet-like article. Other methods, such as bonding with an adhesive, may be used.

  The surface sheets 2b and 2c on both sides of the base sheet 2 may be the same material or may be changed as appropriate. If the composite sheets of the base sheet 2 can be fixed, the surface sheets 2b and 2c of the base sheet 2 also use different materials. May be.

  The fusion sheet 2 is punched out using a conventional press punching means into a so-called sheet 1 in which the seat and the backrest portion are integrated into a flat surface. FIG. 6 shows a flat fused sheet 2 formed by punching. At the time of punching, it is preferable to form holes 5 at positions corresponding to the mounting holes formed in the chair frame at the same time.

  This hole 5 has a hole large enough for the screw neck to pass and a hole large enough for the threaded shaft to pass without passing through the screw neck, so that it can cope with the case where the screw of the screw hole of the frame is attached in advance. Have a communicating shape. The hole 5 may be simply a circular hole through which a screw neck can be inserted so that a screw can be inserted and screwed later, or holes having different shapes may be mixed.

  As already mentioned, the chair 1 has a pressed sheet composite layer 2 in the form of a shell and a surface whose three-dimensional shape is adapted so that it can be joined on one side of the pressed sheet composite layer 2. It is basically composed of a pressed cushion layer 3 and a pipe 4.

  Therefore, the pressed sheet composite layer 2 and the pressed cushion layer 3 can be pressed sequentially, in parallel, or together, and the order can be arbitrarily changed.

  A method for manufacturing the pressed sheet composite layer 2 and the pressed cushion layer 3 will be described.

  FIG. 8 shows an overall perspective view of the press molding apparatus 20. The press molding apparatus 20 includes a pair of dies 21 and 22 provided vertically, and has mold frames 21a and 22a, and surfaces 21b and 22b where the upper and lower dies 21 and 22 fit tightly.

  The shape of the surface of the mold frame 21a is made to match the shape of the back surface of the chair of the completed pressed sheet composite layer 2 of the chair 1, that is, the surface opposite to the surface on which the user sits. On the other hand, the shape of the surface of the formwork 22a is made according to the shape of the front side of the chair of the pressed cushion layer 3 of the completed chair 1, that is, the shape of the surface on which the user sits. Since the sheet S is formed from the pressed sheet composite layer 2 and the pressed cushion layer 3, the sheet S is pressed onto the fused sheet 2 before forming the pressed sheet composite layer 2, which is a part of the sheet S. When performing the processing, a form adapter (not shown) for the fusion sheet 2 which is installed on the form frame 22a and interposed between the fusion sheet 2 and the form frame 22a is used. Further, when performing press working on the pressed cushion layer 3, it is installed on the formwork 21 a and, when performing press working on the cushion material before molding of the pressed cushion layer 3, installed on the formwork 21 a A mold adapter (not shown) for the cushion material 3 interposed between the material 2 and the mold 21a is used.

  The press forming apparatus 20 is provided with means 8a and 8b for positioning the fusion sheet 2.

  The upper and lower dies 21, 22 have surfaces 21b, 22b that fit snugly together. The inner edges of the surfaces 21b and 22b to be fitted are boundaries between the molds 21 and 22a, and the boundaries correspond to the edges of the sheet S.

First, a method of forming the pressed sheet composite layer 2 will be described.
Heat is applied to the punched fusion sheet 2 to enhance its deformability. As the heating device, the thermocompression bonding device 10 already used can be reused. However, in the creation of the fusion sheet 2 described above, the purpose is heat fusion, but here, in order to facilitate attachment to the mold when performing later molding, the fusion sheet 2 is easily formed. This is intended for the purpose of a heat treatment for making the state deformable. Therefore, as long as the preparation for the molding is performed, any temperature can be applied as long as the temperature can be applied to a temperature that is easy to deform and is lower than the fusion temperature of the fusion sheet 2.

  A mold adapter for the fusion sheet 2 is set on the mold 22a of the press molding apparatus 20, and then the fusion sheet 2 is set in accordance with the surface of the mold adapter. At this time, the positioning means 8a, 8b and the positioning means 7a, 7b provided on the fusion sheet 2 ensure that the setting is performed in a correct positional relationship on the surface of the form adapter. .

  Specifically, the positioning means 8a and 8b of the mold 20 are pins 8a and 8b provided on both sides of the lower mold 22, and the positioning means 7a and 7b provided on the fusion sheet 2 Holes 7a and 7b that can be inserted. However, it is not limited to this as long as they can be positioned relative to each other.

  In order to set the fusion sheet 2 in the molding apparatus 20, the temperature is raised to a temperature at which deformation processing is easy, and the pins 8a, 7b are respectively inserted into the holes 7a, 7b of the heated fusion sheet 2 while keeping the temperature as low as possible. The fusion sheet 2 may be taken so that the sheet 8b is inserted, and after insertion, the fusion sheet 2 may be spread on the form adapter placed on the form 22a.

  The cut out fused sheet 2 having substantially the same thickness is set so that the edge thereof is aligned with the edges of the mold frames 21 and 22a, that is, the edges of the mating surfaces 21b and 22b.

  When the setting is completed, the upper mold 21a is pressed toward the lower mold 22a and molded. At this time, in order for the fitting surfaces 21b and 22b to be fitted exactly, the portions of the extended portions 9 extending from the left and right centers of the fusion sheet 2 to both sides extend from the molds 21 and 22a to the fitting surfaces. 21b, 22b substantially cuts or becomes very thin and can be removed from the fused sheet press.

  In order to cool the fused sheet cut out and set in accordance with the mold and formed and processed, cooling air or an environmentally safe cooling gas is supplied to at least one of the molds to cool the surface of the mold. The fused sheet 2 cooled by the cooling action is solidified to maintain the shape of the form. After being solidified, the fused sheet 2 is removed from the mold. Here, the press processing of the fusion sheet is mainly shaping according to the chair shape, and the thickness of the pressed sheet composite layer 2 does not substantially change from the thickness of the fusion sheet, and is slight, if any. .

On the other hand, in this example, the pressed cushion layer 3 is a cushion sheet 3 in which polyester fibers, which are the same material as the surface sheets 2b and 2c of the base sheet 2, are entwined three-dimensionally in a cotton-like manner into a plate shape. ing. A sheet having a density of about 34 kg / m ³ and a hardness of about 30 kgf is used in order to provide an appropriate cushioning property as a sheet, but may be appropriately changed according to the purpose of use. Any material that is easily deformed by heating, can be molded by cooling, has cushioning properties at normal use temperature, has hygroscopicity, and has a strong rebound resilience is not limited to polyester. However, the density and hardness can be appropriately changed according to the properties of the fiber.

  The thickness of the cushion sheet 3 is approximately 4 mm, and the size of the cushion sheet 3 is larger both vertically and horizontally than when the sheet S is developed on a plane. As in the case of the fusion sheet, in order to make the cushion sheet 3 into the shape of the pressed cushion layer of the sheet S, heating for facilitating the deformability is performed before the pressing. For heating, the thermocompression bonding device 10 can be reused similarly to the fusion sheet 2. However, this is also for the purpose of performing a heat treatment for making it easily deformable in order to facilitate attachment to the mold when performing later-formed molding. Therefore, as preparation for molding, it is only necessary that the temperature be within a range that can be applied to a temperature at which deformation and compression can be easily performed according to the material of the cushion sheet 3.

  As is clear from FIG. 1, the chair 1 has a bent shape in the process from the seat to the backrest. Therefore, as shown in FIG. 8, in forming the mold, a mold corresponding to the bent shape is prepared. However, even when heated to enhance the deformability, in the process of folding and throwing a substantially flat sheet material, wrinkles are usually generated from the broken portion, resulting in a deterioration in quality. In particular, since the portion of the cushion sheet 3 facing the user side is bent inward, wrinkles are extended to both sides from the fold line, and the quality is likely to deteriorate.

  Therefore, in order to prevent the occurrence of the wrinkles, a jig for forming a bending habit may be provided in the heating so that the bending is naturally generated from the portion corresponding to the fold.

  FIG. 7 shows an example in which a pipe 16 for imparting a kinks to the cushion sheet 3 before press molding is used. The pipe 16 is preferably made of a metal having a high thermal conductivity, for example, a metal so that heat from the thermocompression bonding plate 11b can be transmitted to the cushion sheet 3. In addition to the shape of the pipe, any shape that can be bent can be used. In FIG. 7, the pipe 16 is sandwiched between the flat cushion sheets 3 placed on the thermocompression-bonding plate 11b.

  Returning to the press working, a mold adapter for the cushion sheet 3 is set in the mold 21a of the press molding apparatus 20 in FIG.

  The cushion sheet 3 has a relatively large size, and the creased portion is aligned with the top of the "a" -shaped 22a, the mold 21 is lowered in that state, and the mating surface 21b, When 22b is pressed so as to fit, it is broken from the kinks, and molding by the mold 22a and the formwork adapter is performed. At this time, an extra portion outside the cushion sheet 3, that is, a portion corresponding to the outside from the edge of the sheet S, is substantially cut off by the mating surfaces 21b, 22b or becomes extremely thin and is removed from the cushion sheet 3. The pressed cushion layer conforming to the shape of the sheet S is molded.

  In order to cool the molded cushion sheet 3, cooling air or an environmentally safe cooling gas is fed into at least one of the molds to cool the surface of the mold. The cushion sheet 3 cooled by the cooling action solidifies and maintains the shape of the formwork. After being solidified, it is removed from the mold as a pressed cushion layer 3.

  FIG. 9 is a front view of the mold frame 22 for understanding the characteristic shape formed by the mold 22 of the press molding apparatus 20. Due to some emphasis on features, they do not match the actual dimensional ratios. The visible ridge line of the mold 22a indicates a bent portion between the backrest of the shell S and the seat.

  The ridgeline is highest in the center of the chair and gently lowers from both sides. The actual surface of the chair conforms to the shape of the surface of the formwork 22a, and the cushion layer 3 molded by the press molding device 20 allows the user of the seat S to adapt the seat S to a human body shape. The drawing surface is deeply drawn so that the sitting surface is formed with a concave portion along the shape of the human body from the waist to the back of the thigh. As described above, since the pressed cushion layer has a three-dimensionally formed concave portion, the thickness of the pressed cushion layer varies depending on the position. In this example, the same dies 21 and 22 are used, but the pressed sheet composite layer and the pressed cushion layer may be formed by different dies.

DESCRIPTION OF SYMBOLS 1 ... Chair 2 ... Basic sheet, fusion sheet, press processed sheet composite layer 2a ... Core material sheet
2b, 2c: Surface sheet 3: Cushion material (cushion sheet), pressed cushion layer 4: Frames 7a, 7b: Positioning means, holes 8a, 8b: Positioning means, pins 10. ··· Thermocompression bonding equipment 11a, 11b ··· Thermocompression bonding plate 20 ··· Press molding equipment 21 and 22 ··· Mold 21a and 22a ··· Formwork 21b and 22b ··· Fitting surface S ··· Sheet

Claims (3)

a) A first sheet layer made of a thermoplastic resin having a mesh shape and second and third sheet layers made of a thermoplastic resin provided on respective surfaces of the first sheet layer are heat-sealed. The seat composite layer was punched into a shape corresponding to the shape of the seat from the backrest or the seat, or the backrest along the shape of the chair frame, and the punched sheet composite layer was softened by applying heat. Press working in the state and deforming, then cooling and solidifying,
b) pressing and deforming the cushion material made of a thermoplastic resin by applying heat to soften the material, and then cooling and solidifying the cushion material;
c) adhering the pressed sheet composite layer and the pressed cushion material;
A method for manufacturing a chair seat, comprising:
The press machine used for the sheet composite layer in the step a) and the press machine used for the cushion material in the step b) are the same press machine, and the sheet composite layer and the cushion are used. A method of manufacturing a chair seat, wherein different form adapters for molding the material are used in each step or on separate press machines. The seat composite layer pressed by the chair seat manufacturing method according to claim 1 is fixed to a chair frame, and the surface of the cushion material pressed to one surface of the seat composite layer in the fixed state is aligned. A method for manufacturing a chair, wherein the chair sheet is formed by bonding. 2. The press machine according to claim 1 , wherein the press machine has a surface along which a pair of dies fit together along an edge of a sheet to be molded, and an edge of the molded cushion material is formed. Manufacturing method of chair seat.