JP2020131586A - Hollow structural sheet - Google Patents

Abstract

To provide a hollow structural sheet which has high bending rigidity under high temperature condition and is also excellent in impact resistance.SOLUTION: A hollow structural sheet is formed of a hollow projection molding sheet composed of one or two thermoplastic resins in which a plurality of hollow projections are formed on at least one surface, in which the thermoplastic resin is composed of polycarbonate and a polyester-based resin, and a mass ratio of the polycarbonate to the polyester-based resin is 50:50 to 90:10. The hollow structural sheet may be formed by bonding one or a plurality of surface materials and/or skin materials composed of a thermoplastic resin onto at least one surface of the hollow projection molding sheet.SELECTED DRAWING: Figure 1

Description

The present invention relates to a hollow structural plate. More specifically, the present invention relates to a hollow structure plate having high flexural rigidity under high temperature conditions and excellent impact resistance.

Hollow structural plates made of resin are lightweight, have excellent chemical resistance, water resistance, heat insulation, sound insulation and resilience, and are easy to handle. Therefore, they are used for logistics, construction such as panel materials, and more. Is used in a wide range of fields such as automotive applications. For example, in Patent Document 1, a corrugated member made of a synthetic resin material in which an uneven waveform is repeated at a predetermined pitch between two sheets made of a synthetic resin material arranged in parallel at a predetermined interval. A hollow structural plate in a sandwiched state is disclosed.

Further, for example, in Patent Document 2, a so-called twin cone (registered trademark) type hollow structure having a structure in which a plurality of convex portions projecting from two thermoplastic resin sheets are abutted and heat-sealed. The board is disclosed. This twin cone (registered trademark) type hollow structure plate is used in various fields such as automobile interior materials, logistics materials, and building materials because it has excellent bending performance and compression performance.

Japanese Unexamined Patent Publication No. 2003-170515 JP-A-2007-83407

However, in the hollow structure plate having the conventional structure, it is difficult to achieve both flexural rigidity and impact resistance under high temperature conditions. For example, in the case of a hollow structure plate made of only polycarbonate, although it is excellent in flexural rigidity under high temperature conditions, its impact resistance is not sufficient because the adhesive force between sheets is low. On the other hand, in the case of a hollow structure plate made of polypropylene only, although it is excellent in impact resistance, it cannot exhibit sufficient flexural rigidity under high temperature conditions because the glass transition temperature, melting point, and deflection temperature under load are low.

Therefore, in view of such circumstances, it is a main object of the present invention to provide a hollow structure plate having high bending rigidity under high temperature conditions and excellent impact resistance.

As a result of diligent experimental studies by the inventors of the present application, we focused on the types of thermoplastic resins that make up the hollow convex molded sheet, used specific types of thermoplastic resins in combination, and devised their mass ratios. As a result, they have found that a hollow structural plate having high bending rigidity under high temperature conditions and excellent impact resistance can be obtained, and have completed the present invention.

That is, in the present invention, the present invention comprises a hollow convex portion molded sheet made of one or two thermoplastic resins having a plurality of hollow convex portions formed on at least one surface, and the thermoplastic resin is a polycarbonate and a polyester resin. Provided is a hollow structural plate comprising the polycarbonate and the polyester resin having a mass ratio of 50:50 to 90:10.
The hollow structure plate according to the present invention may be formed by laminating one or more surface materials and / or skin materials made of thermoplastic resin on at least one surface of the hollow convex molded sheet. Good.
Further, in the present invention, the melting point of the polyester resin may be 75 ° C. or higher higher than the glass transition temperature of the polycarbonate.
Further, in the present invention, the crystallization temperature of the polyester resin may be 45 ° C. or less lower than the melting point of the polyester resin.

According to the present invention, it is possible to provide a hollow structure plate having high bending rigidity under high temperature conditions and also having excellent impact resistance.
The effects described here are not necessarily limited, and may be any of the effects described in the present disclosure.

A is a perspective view schematically showing the structure of the first embodiment of the hollow structure plate 1 according to the present invention, and B is a cross-sectional view of A. It is a perspective view which shows typically the structure of the 2nd Embodiment of the hollow structure plate 1 which concerns on this invention. A is a perspective view schematically showing the structure of the third embodiment of the hollow structure plate 1 according to the present invention, and B is a plan view of A. A is a perspective view schematically showing the structure of the fourth embodiment of the hollow structure plate 1 according to the present invention, and B schematically shows the structure of the fifth embodiment of the hollow structure plate 1 according to the present invention. It is a perspective view which shows. A and B are conceptual diagrams showing an example of a method for manufacturing the hollow structure plate 1 according to the present invention.

Hereinafter, suitable embodiments for carrying out the present invention will be described in detail with reference to the drawings.
It should be noted that the embodiments described below show an example of typical embodiments of the present invention, and the scope of the present invention is not narrowly interpreted by this.

1. 1. Hollow structure plate 1
The hollow structure plate 1 according to the present invention is composed of a hollow convex portion molded sheet 2 made of one or two thermoplastic resins having a plurality of hollow convex portions formed on at least one surface, and the thermoplastic resin is It is composed of polycarbonate and a polyester resin, and is characterized in that the mass ratio of the polycarbonate to the polyester resin is 50:50 to 90:10.

The hollow structure plate 1 according to the present invention has the above-mentioned characteristics, so that it has high flexural rigidity under high temperature conditions and is also excellent in impact resistance. Therefore, it is useful in a wide range of fields such as logistics applications such as box materials and packing materials, and construction applications such as panel materials to be attached to walls, ceilings, tunnels, etc., and is expected to be used especially under high temperature conditions. It can also be used in the fields of automobile interiors, bath aprons, bath lids, etc., while having sufficient rigidity and impact resistance.

Is not particularly weight of the hollow plate 1 limited and is preferably 200~6000g / ^{m 2,} more preferably to 300~4000g / ^{m 2,} it is particularly preferable that the 400~2500g / ^{m 2.} As a result, the weight of the hollow structure plate 1 can be reduced.

The thickness of the hollow structure plate 1 is also not particularly limited, but is preferably 1.5 to 55 mm. By setting the thickness to 1.5 mm or more, the thickness of the hollow structure plate 1 can be prevented from becoming too thin, and the hollow structure plate 1 having bending rigidity can be manufactured. Further, by setting the height to 55 mm or less, the height of the convex portion 21 in the hollow convex portion molded sheet 2 can be controlled, and the thickness of the side wall of the convex portion 21 can be prevented from being drafted and become too thin, so that deformation (buckling) is performed. Can be produced as a hollow structure plate 1 in which

The end face of the hollow structure plate 1 according to the present invention can be processed into an arbitrary shape. Specifically, for example, the end face may be left uncut, and the end face may be processed into a C shape or the like, sealed in a vertical end face, or sealed in an R shape. Further, in the present invention, in order to impart functionality to the end face of the hollow structure plate 1, an edge material can be attached to the end face via an adhesive or the like.

<Hollow convex molded sheet 2>
The hollow convex portion molding sheet 2 is made of one or two thermoplastic resins having a plurality of hollow convex portions formed on at least one surface thereof. Further, one or a plurality of surface materials 3 and / or skin materials 4 made of a thermoplastic resin may be bonded to at least one surface of the hollow convex portion molding sheet 2. In the present invention, there may be a slight gap partially between the surface material 3 and / or the skin material 4 laminated on the hollow convex molded sheet 2 and the hollow convex molded sheet 2. ..

The present invention is characterized in that the thermoplastic resin constituting the hollow convex molded sheet 2 is composed of two types, polycarbonate and polyester resin.

When only polycarbonate is used, the flexural rigidity under high temperature conditions is excellent, but the impact resistance is not sufficient. On the other hand, when only the crystalline resin is used, the impact resistance is excellent, but the bending rigidity under high temperature conditions is not sufficient. Therefore, the inventors of the present application mixed polycarbonate and various crystalline resins to perform molding.

When mixed with polypropylene, which is one of the crystalline resins, the polycarbonate phase first solidifies and then the polypropylene phase crystallizes, causing volume shrinkage and interfacial peeling. Further, when mixed with polyacetal, which is one of other crystalline resins, polyacetal is thermally decomposed when the temperature is raised to the extrusion temperature of polycarbonate, so that there is no prospect of molding.

On the other hand, the inventors of the present application succeeded in mixing with polycarbonate when mixed with a polyester resin, and were able to achieve both flexural rigidity (heat resistance) and impact resistance under high temperature conditions.

In the present invention, the method of mixing the polycarbonate and the polyester resin is not particularly limited, and a conventionally known method can be used. For example, either a thermodynamically mixed compatible polymer alloy or a physically and chemically mixed incompatible polymer alloy may be used. More specifically, a part of the polycarbonate and the polyester resin may be partially mixed by an ester exchange reaction. Examples thereof include a chemical method in which polycarbonate and polyester resin pellets are blended with a blender. Further, at the time of mixing, a commonly used additive may be added, if necessary, as long as the effect of the present invention is not impaired.

Furthermore, the inventors of the present application also paid attention to the mass ratio of polycarbonate and polyester resin. That is, when the mass ratio of polycarbonate is less than 50, it is difficult to secure flexural rigidity under high temperature conditions. On the other hand, when the mass ratio of polycarbonate exceeds 90, the impact resistance is not excellent, and the resin adheres to the mold, which makes continuous molding difficult. Therefore, the inventors of the present application have excellent bending rigidity under high temperature conditions by setting the mass ratio of the polycarbonate to the polyester resin to 50:50 to 90:10, and further improve impact resistance and continuous moldability. Also found to be excellent.

In the present invention, the mass ratio of the polycarbonate to the polyester resin is not particularly limited as long as it is in the range of 50:50 to 90:10, but it is preferably 60:40 to 80:20, preferably 70:30. Is particularly preferable.

The polyester resin is not particularly limited, and examples thereof include polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyethylene naphthalate (PEN), polytributylene terephthalate (PTT), and unsaturated polyester. In the present invention, among these, polyethylene terephthalate or polybutylene terephthalate is preferable, and polybutylene terephthalate is more preferable.

In the present technology, it is preferable that the difference between the melting point of the polyester resin and the glass transition temperature of the polycarbonate is as high as 75 ° C. or more. As a result, the flexural rigidity under high temperature conditions can be further improved.

Further, in the present technology, the difference between the melting point of the polyester resin and its crystallization temperature is preferably small from the viewpoint of continuous moldability and impact resistance of the hollow convex molded sheet, and the crystallization temperature of the polyester resin is determined. It is preferably 45 ° C. or less lower than the melting point of the polyester resin.

The texture of the hollow convex portion molded sheet 2 is not particularly limited, but is preferably 150 g / m ² or more. By setting the texture to 150 g / m ² or more, the convex portion 21 can be formed satisfactorily.

In the present invention, fillers such as talc, mica and calcium carbonate, chopped strands such as glass fiber, aramid fiber and carbon fiber are added to the thermoplastic resin forming the hollow convex molded sheet 2 and the surface material 3 described later. Alternatively, a modifier for improving flame retardancy, conductivity, wettability, slipperiness, weather resistance, etc., a colorant such as a pigment, or the like may be added.

The hollow convex portion molding sheet 2 and the surface material 3 described later may be formed of the same material, or may be formed of different materials within a range in which heat fusion is possible.

Further, in the present invention, it is also possible to adopt a structure in which a flow path exists in a part of the hollow convex portion forming sheet 2. In the present invention, the shape of the flow path, the structure of the cross section, the formation direction of the flow path, and the like are not particularly limited.

As shown in B of FIG. 1, the convex portion 21 has at least an upper surface portion 211 and an opening portion 212, and the form thereof is not particularly limited and can be freely designed as appropriate. Specifically, for example, a truncated cone shape such as a truncated cone shape or an elliptical pyramid shape, a triangular pyramid shape, a quadrangular pyramid shape, a pentagonal pyramid shape, and a cylindrical shape shown in FIGS. It can be designed into various shapes such as an elliptical column shape, a polygonal column shape, a polygonal star column shape, and a polygonal truncated cone shape. Moreover, you may design by combining these shapes as appropriate.

In the present invention, when the surface material 3 described later is laminated on the hollow convex portion forming sheet 2, the starting point is reduced and the peel strength from the surface material 3 is improved, so that a polygonal pyramid shape or a polygonal prism shape is formed. Etc. may be designed with rounded corners.

In the present invention, among these, it is particularly preferable to design the convex portion 21 into a truncated cone shape, an elliptical truncated cone shape, or a polygonal truncated cone shape. As a result, in addition to facilitating the design in the manufacturing process, when the convex portion 21 is molded using the mold, the manufacturing cost of the mold can be reduced. Further, in the present invention, it is more preferable to design the convex portion 21 into a truncated cone shape or an elliptical truncated cone shape. As a result, the bending rigidity of the hollow structure plate 1 can be improved, and the compressive strength can be maintained.

When the convex portion 21 is designed to have a truncated cone shape or an elliptical truncated cone shape, the length of the diameter of the upper surface portion 211 is not particularly limited, but is preferably 1 to 10 mm. As a result, the compressive strength of the hollow structure plate 1 in the thickness direction can be improved.

When the convex portion 21 is designed to have a truncated cone shape or an elliptical truncated cone shape, the length of the diameter of the opening 212 is not particularly limited, but is preferably 3 to 15 mm. As a result, the compressive strength of the hollow structure plate 1 in the thickness direction can be improved.

In the present invention, the convex portions 21 may all have the same form, or two or more types may be freely selected and combined as appropriate. Further, in the present invention, a step may be provided in the middle of the convex portion 21, or a wave may be provided in the middle of the convex portion 21.

The arrangement form of the convex portions 21 is not particularly limited, and the convex portions 21 can be arranged in a square grid pattern, a staggered pattern, or irregularly, but it is preferable to arrange the convex portions 21 in a square grid pattern or a staggered pattern. In addition, in this specification, the staggered arrangement also includes a state in which adjacent convex portions 21 are arranged so as to be staggered when viewed along a predetermined reference direction.

When the convex portions 21 are arranged in a staggered pattern, the angle θ2 formed by the line connecting the centers of the convex portions 21 in the lateral direction and the line connecting the centers of the convex portions 21 in the diagonal direction θ2 (see B in FIG. 3). ) Is not particularly limited, but it is preferable that θ2 = 60 °. Thereby, the rigidity of the hollow structure plate 1 can be improved. The “square grid” means an array when θ2 = 90 °.

The shortest distance L between the openings 211 of the convex portion 21 is not particularly limited, but is preferably 0.2 to 8 mm. By setting the shortest distance L to 0.2 mm or more, the thickness of the liner portion (the portion where the convex portion 21 does not exist when the convex portion 21 is viewed from a certain direction) can be prevented from becoming too thin, so that the compression strength can be prevented. Can be avoided. Further, by setting the shortest distance L to 8 mm or less, it is possible to prevent the distance between the convex portions 21 from becoming too long and the number of convex portions 21 per unit area from decreasing too much. Therefore, the bending rigidity of the hollow structure plate 1 is reduced. It can be kept above a certain level. In the hollow structure plate 1 according to the present invention, the shortest distance L does not have to be always constant.

The angle (inclination angle) θ1 (see B in FIG. 1) formed by the imaginary horizontal surface and the convex portion 21 in the hollow convex portion forming sheet 2 is not particularly limited, but when a load is applied from the outside of the hollow structure plate 1. , It is preferable to have an inclination angle in order to obtain sufficient strength. When it has an inclination angle, the inclination angle θ1 is preferably 45 ° or more. Further sufficient strength can be obtained by setting the inclination angle θ1 to 45 ° or more. Further, the inclination angle θ1 is preferably less than 80 °. By setting the inclination angle θ1 to less than 80 °, it is possible to prevent the hollow convex portion forming sheet 2 from becoming too thin when the hollow convex portion forming sheet 2 is vacuum-formed, and to form the convex portion 21 into a film. Can also be prevented, so sufficient strength can be obtained.

Further, the inclination angle θ1 is more preferably 50 ° or more and less than 75 °. Thereby, the rigidity of the hollow structure plate 1 can be increased. Further, it is possible to prevent deformation due to buckling or the like and improve the shape retention of the hollow structure plate 1. In the hollow structure plate 1 according to the present invention, the inclination angle θ1 may not always be constant, and the convex portion 21 may have a shape asymmetrical with respect to the central axis.

The height h of the convex portion 21 (see B in FIG. 1) is not particularly limited, but is preferably 1 mm or more. By setting the height h of the convex portion 21 to 1 mm or more, the hollow structure plate 1 having high rigidity can be obtained. Further, the height h of the convex portion 21 is preferably 50 mm or less. By setting the height h of the convex portion 21 to 50 mm or less, it is possible to prevent the side wall portion of the convex portion 21 from becoming too thin and prevent the hollow convex portion molded sheet 2 from being deformed.

The thickness of the convex portion 21 is also not particularly limited, but is preferably 0.1 mm or more. By setting the thickness of the convex portion 21 to 0.1 mm or more, deformation such as buckling can be prevented and the shape retention of the hollow structure plate 1 can be improved.

As a specific example of the structure of the hollow convex portion forming sheet 2, as shown in A and B of FIG. 4, one heat sheet in which a plurality of truncated cone-shaped or elliptical truncated cone-shaped convex portions 21 are formed on one surface. Examples thereof include a structure made of a plastic resin. By adopting this structure, it is possible to provide the hollow structure plate 1 which is excellent in workability while maintaining the planar compressive strength. The hollow structure plate 1 having this structure can be manufactured by, for example, the manufacturing method shown in FIG. 5 described later.

In the present invention, as shown in A and B of FIG. 4, when the hollow convex portion molding sheet 2 is made of one thermoplastic resin in which a plurality of hollow convex portions are formed, the viewpoint of improving the flexural rigidity. Therefore, it is preferable that the surface material 3 and / or the skin material 4 described later is bonded to the sheet 2.

Further, as another specific example, as shown in FIGS. 1 to 3, it is composed of two thermoplastic resin sheets in which a plurality of truncated cone-shaped or elliptical truncated cone-shaped convex portions 21 are formed on one surface. The two thermoplastic resin sheets may have a structure in which the convex portions 21 are fused to each other in a state where the convex portions 21 are butted against each other. By adopting this structure, it is possible to provide the hollow structure plate 1 in which the generation of warpage is suppressed and the bending rigidity is also excellent. The hollow structure plate 1 having this structure can be manufactured by, for example, the manufacturing method shown in FIG. 5 described later.

<Surface material 3>
The hollow structure plate 1 may have a surface material 3 if necessary. The surface material 3 is laminated on the hollow convex molded sheet 2 and is made of a thermoplastic resin. In the present invention, the number of the surface materials 3 is not particularly limited. Further, the skin material 4 described later may be laminated on the surface material 3 as long as the effect of the present invention is not impaired.

The thickness of the surface material 3 is not particularly limited, but is preferably 0.1 mm or more. By setting the thickness to 0.1 mm or more, the rigidity of the hollow structure plate 1 can be maintained.

The texture of the surface material 3 is not particularly limited, but is preferably 100 g / m ² or more. By setting the texture to 100 g / m ² or more, it is possible to prevent the surface material 3 from becoming too thin and torn when the surface material 3 is attached to the hollow convex portion molded sheet 2.

The material of the surface material 3 is not particularly limited as long as it is a thermoplastic resin, and one type or two or more types of thermoplastic resins that can be usually used for a hollow structure plate can be freely used.

Examples of the thermoplastic resin include polyethylene (PE), polypropylene (PP), polystyrene (PS), polyurethane, polycarbonate (PC), polymethylmethacrylate (PMMA), polyacetal (POM), polybutylene terephthalate (PBT), and polyethylene. Examples thereof include terephthalate (PET) and ABS resin.

In order to further improve the flexural rigidity and impact resistance under high temperature conditions, a thermoplastic resin having a deflection temperature under load (temperature in JIS K 7191: 2007 A method) of 90 ° C. or higher is more suitable as the material of the surface material 3. preferable.

In the present invention, a plurality of surface materials 3 may be provided, and in this case, the thicknesses of the plurality of surface materials 3 may be the same or different. Further, each surface material 3 may be formed of the same material or may be formed of different materials.

<Skin material 4>
The hollow structure plate 1 may have a skin material 4 if necessary. The skin material 4 is laminated on the hollow convex molded sheet 2 and / or the surface material 3, but is preferably laminated on the surface material 3. In the present invention, the number of the skin materials 4 is not particularly limited. By laminating the skin material 4, it is possible to impart properties such as design property, sound absorption property, and heat insulation property to the hollow structure plate 1 according to various uses.

The material of the skin material 4 is not particularly limited, and a material that can be usually used as the skin material of the hollow structure plate can be freely selected and used depending on the intended use and the like. Specific examples thereof include thermoplastic resin sheets, resin woven fabrics, non-woven fabrics, braided fabrics, knitted fabrics, metal sheets made of stainless steel, aluminum, copper and the like, organic or inorganic porous sheets, decorative sheets and the like. Be done. Further, it is also possible to use a laminated sheet or the like in which a plurality of sheets of the same type or different types are laminated as the skin material 4.

In the present invention, a plurality of skin materials 4 may be provided, and in this case, the thicknesses of the plurality of skin materials 4 may be the same or different. Further, each skin material 4 may be formed of the same material or may be formed of different materials.

2. 2. Manufacturing Method of Hollow Structure Plate 1 Since the hollow structure plate 1 according to the present invention is characterized in its structure, the manufacturing method is not particularly limited. That is, the hollow structure plate 1 according to the present invention can be manufactured by a method usually used when manufacturing a hollow structure board.

A and B of FIG. 5 are conceptual diagrams showing an example of a method for manufacturing the hollow structure plate 1 according to the present invention. In the step shown in FIG. 5A, first, the molten thermoplastic resin P is pressed from both sides with the dies D1 and D2 to produce one hollow convex molded sheet 2, and then each of them. By heating the convex portions 21 of the hollow convex portion forming sheet 2 and heat-sealing the convex portions 21 to each other, the hollow convex portion forming sheet 2 made of two thermoplastic resins is manufactured.

In addition to the step shown in A of FIG. 5, when the surface material 3 and / or the skin material 4 is attached to the hollow convex portion molded sheet 2, the step shown in B of FIG. 5 is further performed. In B of FIG. 5, the sheet-shaped surface material 3 and / or the skin material 4 is laminated on the hollow convex molded sheet 2 by heat fusion using a roller R provided with a heating means.

Hereinafter, the present invention will be described in more detail based on Examples.
It should be noted that the examples described below show an example of a typical example of the present invention, and the scope of the present invention is not narrowly interpreted by this.

First, the hollow structural plates of Examples 1 to 5 and Comparative Examples 1 to 9 shown in Table 1 below were prepared. The hollow structure plate of Example 1 and Comparative Example 1 was produced by the manufacturing method shown in FIG. 5 with the structure shown in FIG. 1, and the hollow structure plate of Example 2 had the structure shown in FIG. 2 in FIG. The hollow structural plates of Examples 3 to 5 and Comparative Examples 2 to 9 were produced by the production method shown, and the structure shown in FIG. 3 was produced by the production method shown in FIG.

In Table 1 and Table 2 below, PC indicates polycarbonate, PBT indicates polybutylene terephthalate, ABS indicates ABS resin, PP indicates polypropylene, POM indicates polyacetal, and PET indicates polyethylene terephthalate. .. Table 2 below shows the melting points, glass transition temperatures, crystallization temperatures, and deflection temperatures under load of various thermoplastic resins.

Next, the following evaluations were performed for each hollow structure plate. The following evaluation results are also shown in Table 1 above.

[Flexural rigidity under high temperature conditions]
A bending test (3-point bending test) was performed in which a load was applied to the center of each hollow structure plate at 25 × 100 mm (50 mm between fulcrums). Regarding the flexural rigidity (elastic gradient), the load when bending 1 cm from the linear portion of the load-deflection curve obtained by the above bending test was obtained and used as the flexural rigidity (elastic gradient). The number of measurement samples was set to n = 5, and the measurement was performed after waiting for 10 minutes or more under each temperature condition. From the obtained results, the heat resistance retention rate under 80 ° C. conditions with respect to the measured value at room temperature was determined, and evaluation was performed based on the minimum value of n = 5. The evaluation criteria for flexural rigidity under high temperature conditions are shown in Table 3 below.

[Impact resistance]
The drop test was performed with reference to the drop test of the pallet (JISZ0602) in the JIS standard. First, each hollow structure plate of 400 mm square from a height of 1000 mm was dropped on an aluminum plate having a thickness of 6 mm at n = 2, and the degree of adhesion between the hollow convex sheets was visually confirmed. The impact resistance evaluation criteria are shown in Table 4 below.

It was found that the hollow structural plates of Examples 1 to 5 were superior in both flexural rigidity (heat resistance) and impact resistance under high temperature conditions of 80 ° C. as compared with Comparative Examples 1 to 9. Furthermore, the hollow structural plates of Examples 1 to 5 were also excellent in continuous moldability.

According to the present invention, it is possible to provide a hollow structure plate having high bending rigidity under high temperature conditions and also having excellent impact resistance. Therefore, the hollow structural plate according to the present invention is used in a wide range of fields such as logistics applications such as box materials and packing materials, construction applications such as panel materials to be attached to walls, ceilings, tunnels, automobile interiors, bus aprons, bath lids, etc. It is useful in.

1: Hollow structure plate 2: Hollow convex forming sheet 21: Convex 211: Upper surface 212: Opening 3: Surface material 4: Skin material R: Roller provided with heating means
D1, D2: Mold P: Thermoplastic resin in a molten state θ1: Angle formed by the horizontal surface and the convex portion 21 virtualized from the opening 212 of the convex portion 21 θ2: The centers of the convex portions 21 in the lateral direction are connected to each other. Angle formed by the line and the line connecting the centers of the convex portions 21 in the diagonal direction h: Height of the convex portion 21 L: Shortest distance between the openings 212 of the convex portion 21 I: Spacing between the convex portions 21

Claims (4)

It is composed of a hollow convex portion molded sheet made of one or two thermoplastic resins having a plurality of hollow convex portions formed on at least one surface.
The thermoplastic resin is composed of polycarbonate and polyester resin.
A hollow structure plate having a mass ratio of the polycarbonate to the polyester resin of 50:50 to 90:10. The hollow structural plate according to claim 1, wherein one or a plurality of surface materials and / or skin materials made of a thermoplastic resin are bonded to at least one surface of the hollow convex molded sheet. The hollow structural plate according to claim 1 or 2, wherein the polyester resin has a melting point higher than the glass transition temperature of the polycarbonate by 75 ° C. or more. The hollow structure plate according to any one of claims 1 to 3, wherein the crystallization temperature of the polyester resin is 45 ° C. or less lower than the melting point of the polyester resin.