JP2016159468A - Resin structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a resin structure which adopts a layer containing a vinyl chloride resin as a core layer and a skin layer that suppresses buckling of cells in the core layer.SOLUTION: A resin structure 10 is formed by joining sheet-like skin layers 3 and 4 onto both upper and lower surfaces of a core layer 2 in which a plurality of cells S are aligned. The core layer 2 is formed of a composition containing a vinyl chloride resin, a vinyl chloride-vinyl acetate copolymer, an alkyl methacrylate-butadiene-styrene copolymer and a tin-based stabilizer. As for a blending ratio of each of the materials in the core layer 2, when the total weight of the composition is "100 pts.wt.", a blending ratio of the vinyl chloride-vinyl acetate copolymer is 50-90 pts.wt., a blending ration of the MBS is 1-10 pts.wt., and a blending ratio of the tin-based stabilizer is 0.5-5 pts.wt., and the remainder is formed of the vinyl chloride resin.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a resin structure including a core layer in which a plurality of cells are arranged side by side and a skin layer disposed on the surface thereof.

  Conventionally, a plate-like resin structure in which a plurality of cells having a polygonal shape or a columnar shape are arranged in parallel is known. For example, in the resin structure of Patent Document 1, a multiaxial fiber sheet and a skin layer are sequentially joined to the surface of a core layer having a honeycomb shape in which hexagonal columnar cells are arranged side by side. Moreover, in patent document 1, vinyl chloride resin is proposed as a material which comprises a core layer and a skin layer.

  Vinyl chloride resin has the property that combustion cannot be continued if the fire source is removed, so-called self-extinguishing properties. In addition, the vinyl chloride resin has a characteristic that it is easy to perform secondary processing such as printing. Therefore, it can be expected that the application range of the resin structure is expanded by adopting the vinyl chloride resin as the material of the core layer and the skin layer of the resin structure.

JP2013-116630A

  In manufacturing the resin structure as in Patent Document 1, some heating process is performed on the core layer. For example, when a core material is manufactured by folding a sheet material, the core layer may be heated at the time of folding the sheet material or after folding, and the folded core layers may be heat-welded. Further, when the skin layer is joined to the core layer by heat welding, the core layer is also heated appropriately together with the skin layer.

  Here, since the vinyl chloride resin has a relatively high melting temperature, when the vinyl chloride resin is employed as the material of the core layer, it is necessary to increase the heating temperature of the core layer or lengthen the heating time. When the core layer is excessively heated, even a portion that should not be heated and melted in the core layer is heated and melted, and unintended folding or distortion may occur at that location. If unintentional bending or distortion occurs in the core layer, the cells of the core layer are likely to buckle, which causes a decrease in the bending strength and compressive strength of the resin structure.

  The present invention has been made in view of the circumstances of the prior art, and the object thereof is to provide a resin structure that employs a vinyl chloride resin as a core layer and a skin layer. It is to suppress buckling.

  The present invention is a resin structure comprising a core layer in which a plurality of cells are juxtaposed and a skin layer disposed on the surface of the core layer, the core layer comprising a vinyl chloride resin and a vinyl chloride- It contains a vinyl acetate copolymer and an impact resistance improver for reducing the elastic modulus of the core layer, and the skin layer is for reducing the elastic modulus of the vinyl chloride resin and the skin layer. An impact resistance improver is contained, and the blending ratio of the vinyl chloride-vinyl acetate copolymer in the core layer is 50 parts by weight or more.

  According to the said structure, the melting temperature of a core layer can be correspondingly reduced compared with the core layer which does not contain a vinyl chloride-vinyl acetate copolymer, for example. Therefore, when the core layer is thermoformed, the heating temperature can be lowered or the heating time can be shortened, and unintended locations in the core layer can be prevented from being melted by heating. As a result, cell buckling in the core layer can be suppressed.

  In the above invention, the blending ratio of the impact modifier in the core layer is 1 to 10 parts by weight, and the blending ratio of the impact modifier in the skin layer is that of the impact modifier in the core layer. It is preferable that it is larger than a mixture ratio.

  In the above invention, the skin layer does not contain a vinyl chloride-vinyl acetate copolymer, or the blending ratio of the vinyl chloride-vinyl acetate copolymer is the vinyl chloride-vinyl acetate copolymer in the core layer. It is preferable that it is smaller than the mixture ratio.

  ADVANTAGE OF THE INVENTION According to this invention, in the resin structure which employ | adopts what contains a vinyl chloride resin as a core layer and a skin layer, the buckling of the cell in a core layer can be suppressed.

(A) is a perspective view of a resin structure, (b) is a β-β line sectional view in (a), (c) is a γ-γ line sectional view in (a). (A) is a perspective view of the sheet material which comprises the core layer of a resin structure, (b) is a perspective view which shows the state in the middle of folding of the same sheet material, (c) is a perspective view which shows the state which folded the same sheet material Figure.

Hereinafter, a resin structure 10 embodying the present invention will be described with reference to FIGS. 1 and 2.
As shown in FIG. 1A, the resin structure 10 of the present embodiment is formed by bonding sheet-like skin layers 3 and 4 to the upper and lower surfaces of a core layer 2 in which a plurality of cells S are arranged in parallel. Has been.

  As shown in FIGS. 1B and 1C, the core layer 2 is formed by folding a single sheet material molded into a predetermined shape. The core layer 2 includes an upper wall 21, a lower wall 22, and an intermediate wall 23 that is erected between the upper wall 21 and the lower wall 22 and has hexagonal columnar cylindrical portions arranged side by side. The upper wall 21, the lower wall 22, and the intermediate wall 23 define hexagonal columnar cells S in the core layer 2.

  The cells S partitioned and formed in the core layer 2 include first cells S1 and second cells S2 having different configurations. As shown in FIG. 1B, the upper end of the first cell S1 is closed by the upper wall 21 of the two-layer structure, and the lower end is closed by the lower wall 22 of the single-layer structure. The layers of the upper wall 21 of the two-layer structure are joined to each other by heat welding. On the other hand, as shown in FIG. 1C, the second cell S2 has its upper end closed by the upper wall 21 of the single layer structure and its lower end closed by the lower wall 22 of the two layer structure. The layers of the lower wall 22 of the two-layer structure are joined to each other by heat welding. Further, as shown in FIGS. 1B and 1C, the adjacent first cells S1 and the adjacent second cells S2 are partitioned by an intermediate wall 23 having a two-layer structure, respectively. Yes. The upper end portions and the lower end portions of the intermediate wall 23 having a two-layer structure are joined by heat welding.

  As shown in FIG. 1A, the first cell S1 and the second cell S2 are arranged so that the first cells S1 or the second cells S2 are adjacent to each other in the X direction to form a column. In the Y direction orthogonal to the X direction, the columns of the first cells S1 and the columns of the second cells S2 are alternately arranged adjacent to each other. The core layer 2 forms a honeycomb structure by the first cell S1 and the second cell S2.

  The resin structure 10 is formed by joining the sheet-like skin layers 3 and 4 to the upper end and lower end of the core layer 2 formed in this way by thermal welding. As shown in FIGS. 1B and 1C, the upper surface of the resin structure 10 is composed of the upper wall 21 of the core layer 2 and the skin layer 3, and the lower surface of the resin structure 10 is below the core layer. The wall 22 and the skin layer 4 are included.

  The core layer 2 contains a vinyl chloride resin, a vinyl chloride-vinyl acetate copolymer, an impact resistance improver for lowering the elastic modulus of the core layer 2, and a stabilizer for connecting the molecules to prevent deterioration. It is comprised by the composition to do. In this embodiment, an alkyl butadiene methacrylate styrene copolymer (hereinafter abbreviated as MBS) is contained as an impact resistance improver, and a tin-based stabilizer is contained as a stabilizer.

  The blending ratio of each material in the core layer 2 is such that the blending ratio of vinyl chloride-vinyl acetate copolymer is 50 to 90 parts by weight and the blending ratio of MBS is 1 when the weight of the entire composition is “100 parts by weight”. 10 to 10 parts by weight, the blending ratio of the tin-based stabilizer is 0.5 to 5 parts by weight, and the remainder is vinyl chloride resin.

  The upper and lower skin layers 3 and 4 are made of a composition containing a vinyl chloride resin, MBS, and a tin stabilizer. The blending ratio of each material in the skin layers 3 and 4 is such that the blending ratio of MBS is 4 to 30 parts by weight, and the blending ratio of tin-based stabilizer is 0.5 when the weight of the whole composition is “100 parts by weight”. ˜5 parts by weight, with the remainder being vinyl chloride resin. The skin layers 3 and 4 contain MBS different from the core layer 2. Specifically, as the MBS in the skin layers 3 and 4, a butadiene compounding ratio larger than that in the core layer 2 is employed. Therefore, the MBS in the skin layers 3 and 4 has a larger average molecular diameter and lower transparency than the MBS in the core layer 2.

Next, a mode in which a single sheet material 100 is folded to form the core layer 2 will be described.
As shown in FIG. 2A, the sheet material 100 is formed by molding a single thermoplastic resin sheet into a predetermined shape. In the sheet material 100, the planar areas 110 and the bulging areas 120 having a band shape are alternately arranged in the width direction (X direction). In the bulging region 120, a first bulging portion 121 having a cross-section downward groove shape composed of an upper surface and a pair of side surfaces is formed over the entire extending direction (Y direction) of the bulging region 120. The angle formed between the upper surface and the side surface of the first bulge portion 121 is preferably 90 degrees. As a result, the cross-sectional shape of the first bulge portion 121 is a downward U-shape. Further, the width of the first bulging portion 121 (the length of the upper surface in the short direction) is equal to the width of the planar region 110, and the bulging height of the first bulging portion 121 (the length of the side surface in the short direction). ) Is set to be twice as long.

  Further, in the bulging region 120, a plurality of second bulging portions 122 having a trapezoidal shape obtained by dividing the regular hexagon by the longest diagonal line in the bulging region 120 are orthogonal to the first bulging portion 121. Is formed. The bulge height of the second bulge portion 122 is set to be equal to the bulge height of the first bulge portion 121. Further, the interval between the adjacent second bulging portions 122 is equal to the width of the upper surface of the second bulging portion 122.

  The first bulging portion 121 and the second bulging portion 122 are formed by partially bulging the sheet upward using the plasticity of the sheet. The sheet material 100 can be formed from a single sheet by a known forming method such as a vacuum forming method or a compression forming method.

  As shown in FIGS. 2A and 2B, the sheet material 100 configured as described above is heated and softened. Then, the core layer 2 is formed by folding the sheet material 100 along the boundary lines P and Q. Specifically, the sheet material 100 is valley-folded at the boundary line P between the flat region 110 and the bulging region 120 and is folded at the boundary line Q between the upper surface and the side surface of the first bulging portion 121. To compress in the X direction. Then, as shown in FIGS. 2B and 2C, the upper surface and the side surface of the first bulge portion 121 are folded, and the end surface of the second bulge portion 122 and the planar region 110 are folded, so that One prismatic partition 130 extending in the Y direction is formed for one bulging region 120. The plate-shaped core layer 2 is formed by continuously forming such partition bodies 130 in the X direction.

  At this time, the upper wall 21 of the two-layer structure in the core layer 2 is formed by the upper surface and the side surface of the first bulge portion 121, and the end surface of the second bulge portion 122 and the planar region 110 form the core layer 2. A bottom wall 22 of a two-layer structure is formed. In addition, as shown in FIG.2 (c), the upper surface and the side surface of the 1st bulging part 121 in the upper wall 21 fold and form the two-layer structure, and the 2nd bulging part 122 in the lower wall 22 The portions where the end surface and the planar region 110 are folded to form a two-layer structure are overlapped portions 131, respectively.

  The hexagonal columnar region formed by folding the second bulging portion 122 is the second cell S2, and the hexagonal columnar region partitioned between a pair of adjacent partitions 130 is the first cell. S1. In the present embodiment, the upper surface and the side surface of the second bulging portion 122 constitute the side wall of the second cell S2, and between the side surface of the second bulging portion 122 and the second bulging portion 122 in the bulging region 120. The planar portion located constitutes the side wall of the first cell S1. And the contact part of the upper surfaces of the 2nd bulging part 122 and the contact part of the said plane parts in the bulging area | region 120 become the intermediate wall 23 which makes | forms a two-layer structure. Further, the upper end of the first cell S1 is closed by the pair of overlapping portions 131, and the lower end of the second cell S2 is closed by the pair of overlapping portions 131.

  The core layer 2 thus obtained is heated from both sides in the thickness direction (vertical direction in FIG. 2C), and the upper wall 21 (overlapping portion 131) of the two-layer structure in the first cell S1 and the second The lower wall 22 (overlapping portion 131) of the two-layer structure in the cell S2 is joined by thermal welding. Moreover, the upper end parts and lower end parts of the intermediate wall 23 of a two-layer structure are joined by heat welding. By this heat treatment, the folded structure of the core layer 2 is fixed. Thereafter, the skin layers 3 and 4 are bonded to the upper surface and the lower surface of the core layer 2 by thermal welding, whereby the resin structure 10 is manufactured. Further, when the skin layer 3 is thermally welded to the core layer 2, the upper wall 21 (overlapping portion 131) of the two-layer structure in the first cell S1 is also thermally welded again. Similarly, the lower wall 22 (overlapping portion 131) of the two-layer structure in the second cell S2 is also heat-welded again.

The effect of the resin structure 10 of the present embodiment will be described together with its function.
(1) As described above, in the present embodiment, after the sheet material 100 is folded and the core layer 2 is formed, the core layer 2 is heated from both sides in the thickness direction. The heating temperature and heating time at this time are as follows. In the core layer 2, the upper wall 21 (overlapping portion 131) of the two-layer structure in the first cell S1 and the lower wall 22 (overlapping) of the two-layer structure in the second cell S2. The temperature and time at which the part 131) can be joined by thermal welding are set. However, it is difficult to heat only the upper wall 21 and the lower wall 22 in the core layer 2, and the intermediate wall 23 of the core layer 2 is also heated. And when the melting temperature of the core layer 2 is high, it is necessary to raise the heating temperature at the time of heating or lengthen the heating time, and the intermediate wall 23 in the core layer 2 may be excessively heated. If the intermediate wall 23 is excessively heated and melted in the core layer 2, the intermediate wall 23 is bent or distorted. In this case, in the cell S of the core layer 2, buckling tends to occur starting from the portion where the bending or distortion occurs, leading to a decrease in bending strength and compressive strength as the resin structure 10.

  In this regard, in this embodiment, the core layer 2 (sheet material 100) contains 50 to 60 parts by weight of vinyl chloride-vinyl acetate copolymer, and thus contains vinyl chloride-vinyl acetate copolymer. The melting temperature is correspondingly lower than the core layer made of vinyl chloride resin. Therefore, it is possible to prevent the intermediate wall 23 of the core layer 2 from being bent or distorted by lowering the heating temperature or shortening the heating time when heating the core layer 2.

  (2) In this embodiment, the skin layers 3 and 4 do not contain a vinyl chloride-vinyl acetate copolymer, and the proportion of the vinyl chloride resin is increased accordingly. Preferred characteristics of the vinyl chloride resin that the skin layers 3 and 4 occupying most of the outer surface of the resin structure 10 are easily subjected to secondary processing such as self-digestion and printing by increasing the blending ratio of the vinyl chloride resin. Can be appropriately exhibited in the resin structure 10.

  Since the skin layers 3 and 4 do not have the cell S like the core layer 2, the cell does not contain a vinyl chloride-vinyl acetate copolymer and the melting temperature is somewhat high. It is unlikely that there will be a problem that S is likely to buckle.

  (3) In the present embodiment, the core layer 2 contains MBS as an impact resistance improver. When MBS is contained in the core layer 2, the elastic modulus of the core layer 2 is lowered and softened. Therefore, the core layer 2 can be prevented from cracking or cracking when the resin structure 10 is processed such as cutting.

  (4) Since the skin layers 3 and 4 in this embodiment are each in the form of a sheet and are not folded like the core layer 2, the impact tends to concentrate. Further, since the skin layers 3 and 4 constitute the outer surface of the resin structure 10, the stress is likely to act directly when the resin structure 10 is processed such as cutting. Therefore, when processing such as cutting is performed on the resin structure 10, the skin layers 3 and 4 are more likely to crack or crack than the core layer 2.

  In the present embodiment, the skin layers 3 and 4 contain more MBS than the core layer 2. Therefore, the skin layers 3 and 4 have a lower elastic modulus than the core layer 2 and can more appropriately suppress the occurrence of cracks and cracks.

  (5) If the blending ratio of MBS in the skin layers 3 and 4 and the blending ratio of MBS in the core layer 2 are the same, the effect of lowering the elastic modulus is higher when MBS containing a large amount of butadiene is employed. Utilizing such characteristics, in the present embodiment, the MBS in the skin layers 3 and 4 has a larger butadiene blending ratio than the MBS in the core layer 2. Therefore, in this embodiment, the elastic modulus of the skin layers 3 and 4 can be reduced more appropriately, and the occurrence of cracks and cracks can be effectively suppressed.

  (6) In the above embodiment, the step of obtaining a sheet material 100 having a predetermined shape (vacuum forming method, compression molding method, etc.), the step of folding the sheet material 100, the core layer 2 (folded sheet material 100) and the skin layer 3 The resin structure 10 is manufactured through a plurality of heating processes, such as a process of bonding 4 by thermal welding. And when it passes through several times of heating, the core layer 2 will become especially hard and weak by the influence of a thermal history. In the resin structure 10 that has undergone such a manufacturing process, it is preferable that the core layer 2 contains MBS to lower the elastic modulus from the viewpoint of preventing the core layer 2 from being cured due to thermal history.

In addition, the said embodiment may be changed as follows and may apply it combining the following modifications.
The core layer 2 is not limited to forming the core layer 2 by folding and forming one sheet material 100, and the core layer 2 may be configured using a plurality of sheets. For example, the core layer 2 may be configured by bending a belt-like sheet at predetermined intervals and arranging a plurality of curved and bent belt-like sheets facing each other. Further, the core layer 2 may be configured by stacking a plurality of sheets on which cells are formed. In other words, as long as a plurality of spaces are defined by the sheet between the skin layers 3 and 4, the number of sheets disposed between the skin layers 3 and 4 and the manner of bending and bending thereof are not limited.

  In the above embodiment, the hexagonal columnar cells S are defined in the core layer 2. However, the shape of the cells S is not particularly limited, and may be, for example, cylindrical or conical. It may be a polygonal shape such as a quadrangular prism shape or an octagonal prism shape. At that time, cells having different shapes may be mixed. Further, the cells do not have to be adjacent to each other, and a gap (space) may exist between the cells. In addition, when providing a clearance gap (space) between cells, the dimension of the clearance gap does not matter.

  In the above embodiment, the core layer 2 and the skin layers 3 and 4 are bonded by heat welding, but these may be bonded by an adhesive. Further, an adhesive layer formed of a resin that is easily heat-welded may be bonded to at least one side surface of the skin layers 3 and 4, and the skin layers 3 and 4 and the core layer 2 may be bonded via the adhesive layer. .

  In the above embodiment, one or a plurality of layers may be further bonded to the outer surface of the skin layers 3 and 4 (surface opposite to the core layer 2). For example, the skin layers 3, 4 are layers for imparting specific chemical / physical properties (water repellency, light shielding property, high rigidity, etc.) to the outer surface of the resin structure 10 or layers printed with a predetermined pattern or color. You may join to the outer surface. The layer bonded to the outer surface of the skin layers 3 and 4 is not limited to the resin layer, and any material can be used as long as it can be formed relatively thin, such as a metal layer, a paper layer, and a wood layer. Can also be adopted.

  In the above embodiment, the skin layers 3 and 4 are bonded to both surfaces of the core layer 2, but the skin layers 3 and 4 may not be bonded to one side surface of the core layer 2. In this case, the surface of the core layer 2 where the skin layers 3 and 4 are not joined is joined with another layer not containing vinyl chloride resin, for example, a resin layer such as an acrylic resin, or a metal layer such as a metal sheet. Also good.

  The blending ratio of the vinyl chloride-vinyl acetate copolymer in the core layer 2 can be appropriately changed within the range of 50 to 90 parts by weight exemplified in the above embodiment. However, when the blending ratio of the vinyl chloride-vinyl acetate copolymer in the core layer 2 increases, the blending ratio of the vinyl chloride resin decreases accordingly. And when the compounding ratio of a vinyl chloride resin decreases too much, it will become difficult to shape | mold into a sheet form. Therefore, a certain ratio should be ensured as the compounding ratio of the vinyl chloride resin in the core layer 2. From such a viewpoint, the blending ratio of the vinyl chloride-vinyl acetate copolymer in the core layer 2 is preferably 50 parts by weight to 60 parts by weight.

  -The mixing ratio of MBS in the core layer 2 can be appropriately changed between 1 to 10 parts by weight exemplified in the above embodiment. However, if the blending ratio of MBS is low, cracks and the like are likely to occur in the core layer 2 and processing may be difficult. From such a viewpoint, the blending ratio of MBS is preferably 5 to 10 parts by weight.

  Similarly, the blending ratio of MBS in the skin layers 3 and 4 can also be appropriately changed between 4 to 30 parts by weight exemplified in the above embodiment, but the vinyl chloride resin prevents cracking of the skin layers 3 and 4. From the viewpoint of securing the blending ratio, the blending ratio of MBS is preferably 10 to 20 parts by weight.

  In the above embodiment, the different impact resistance improver in the core layer 2 and the impact resistance improver in the skin layers 3 and 4 are adopted, but the present invention is not limited to this. For example, in the above embodiment, as the MBS in the skin layers 3 and 4, a butadiene blending ratio larger than that of the MBS in the core layer 2 is adopted. However, in the skin layers 3 and 4 and the core layer 2, You may employ | adopt MBS (same kind MBS) with the same mixture ratio. Further, as the MBS in the core layer 2, a butadiene compounding ratio larger than that in the skin layers 3 and 4 may be adopted. That is, in consideration of the elastic modulus (flexibility) required for the core layer 2 and the skin layers 3 and 4, an appropriate one may be selected from various MBSs having different butadiene blending ratios.

  The blending ratio of the tin stabilizer in the core layer 2 and the skin layers 3 and 4 can be appropriately changed according to various circumstances as in the MBS. In addition, from the viewpoint of ensuring the blending ratio of the vinyl chloride resin, the blending ratio of the tin stabilizer is preferably 0.5 to 2 parts by weight.

The skin layers 3 and 4 may contain a vinyl chloride-vinyl acetate copolymer.
By the way, when the skin layers 3 and 4 are joined to the core layer 2 by heat welding, the skin layers 3 and 4 are more likely to transmit heat than the core layer 2. At this time, when the melting temperature of the skin layers 3 and 4 is lower than the melting temperature of the core layer 2, the skin layers 3 and 4 may be excessively softened. Therefore, it should be avoided that the melting temperature of the skin layers 3 and 4 is excessively lower than the melting temperature of the core layer 2. From such a viewpoint, even when the skin layers 3 and 4 contain a vinyl chloride-vinyl acetate copolymer, the blending ratio is preferably equal to or less than the vinyl chloride-vinyl acetate copolymer in the core layer 2.

  The impact resistance improver is not limited to MBS as long as the elastic modulus of the core layer 2 and the skin layers 3 and 4 can be reduced. Examples of this type of impact modifier include acrylonitrile butadiene styrene copolymer (hereinafter abbreviated as ABS), chlorinated polyethylene, ethylene-vinyl acetate copolymer, acrylonitrile butadiene rubber, thermoplastic polyurethane, polyester. And thermoplastic elastomers and acrylic resins. In addition, when adopting ABS as the impact resistance improver, as in the MBS in the above embodiment, as the ABS in the skin layers 3 and 4, the one in which the blending ratio of butadiene is larger than the ABS in the core layer 2. It is preferable to adopt.

  In the above embodiment, any tin-based stabilizer can be used, and a specific example is octyltin bis salt. The stabilizer is not limited to a tin-based stabilizer, and for example, a calcium-zinc-based stabilizer, a barium-zinc-based stabilizer, a lead-based stabilizer, metal soap, or the like may be employed.

  The core layer 2 and the skin layers 3 and 4 may contain additives other than the components exemplified in the above embodiment. Examples of this type of additive include a lubricant for improving transparency and glazing, a colorant for coloring, and a flame retardant for making it difficult to burn.

  -The manufacturing method of the resin structure 10 is not restricted to what was illustrated by the said embodiment. If any heat treatment is performed on the core layer 2 (sheet material 100) in manufacturing the resin structure 10, the material structure of the core layer 2 of the present invention is applied to the cell S in the core layer 2. Buckling can be suppressed.

  -The sheet thickness of the sheet material 100 does not matter. However, it is preferable that the sheet thickness is thin from the viewpoint of easy folding of the sheet material 100 and the weight reduction of the resin structure 10 (core layer 2). Therefore, the sheet thickness of the sheet material 100 is preferably equal to or less than the sheet thickness of the skin layers 3 and 4. Further, when the sheet thickness of the sheet material 100 is thin, the cells S in the core layer 2 are likely to buckle. However, in the present invention, such buckling of the cells S can be appropriately suppressed.

The technical idea that can be grasped from the embodiment and the modified examples will be described.
The impact modifier is an alkyl butadiene methacrylate styrene copolymer or acrylonitrile butadiene styrene copolymer, and the impact resistance in the skin layer is higher than the blending ratio of butadiene contained in the impact modifier in the core layer. The blending ratio of butadiene contained in the property improving agent is larger.

  The core layer is formed by folding and molding a sheet material obtained by molding a plastic sheet into a predetermined shape so that a plurality of cells having a polygonal shape or a cylindrical shape are adjacent to each other. .

  2 ... Core layer, 3 ... Skin layer, 4 ... Skin layer, 10 ... Resin structure, S ... Cell, S1 ... First cell, S2 ... Second cell, 100 ... Sheet material.

Claims (3)

A resin structure comprising a core layer in which a plurality of cells are juxtaposed, and a skin layer disposed on the surface of the core layer,
The core layer contains a vinyl chloride resin and a vinyl chloride-vinyl acetate copolymer, and an impact resistance improver for reducing the elastic modulus of the core layer,
The skin layer contains a vinyl chloride resin and an impact resistance improver for reducing the elastic modulus of the skin layer,
The resin structure according to claim 1, wherein a blending ratio of the vinyl chloride-vinyl acetate copolymer in the core layer is 50 parts by weight or more. The blending ratio of the impact modifier in the core layer is 1 to 10 parts by weight,
The resin structure according to claim 1, wherein a blending ratio of the impact modifier in the skin layer is larger than a blending ratio of the impact modifier in the core layer. The skin layer does not contain vinyl chloride-vinyl acetate copolymer, or the blending ratio of vinyl chloride-vinyl acetate copolymer is smaller than the blending ratio of vinyl chloride-vinyl acetate copolymer in the core layer. The resin structure according to claim 1 or 2.