JPS6218445Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a plate-shaped foam laminate whose main constituent is a thermoplastic resin foam mainly composed of a polyolefin resin such as polypropylene.

Although plate-shaped polypropylene resin foams have excellent heat resistance, chemical resistance, and mechanical strength, they are softer than styrene resins, etc.
Low-density foams have low compressive strength, and even high-density foams have softer surfaces than styrene resin foams, which are not completely satisfactory for some uses.

In addition, in recent years, in order to compensate for the above-mentioned drawbacks, a thermoplastic resin mainly composed of polypropylene resin is extruded and foamed through a large number of pores, and a large number of these foamed resin strips are arranged in parallel and bundled. Various plate-shaped foams made by fusing adjacent strips together have been proposed, but these plate-shaped foams have relatively fine cells and a relatively beautiful surface, and have a low-density area and a high-density area. Although it has excellent compressive strength due to its dense structure, the fused portion between the strips remaining on the surface is weaker than when the material is made of styrene resin, etc. It has the disadvantage of being easily split.

In view of the above, the present invention aims to solve and improve the above-mentioned drawbacks of thermoplastic resin plate-shaped foams mainly made of polypropylene resin, which are made by focusing and fusing together a large number of resin foam strips. This was made to obtain a plate material of the same type of foam that has a wide range of applications, and is made of a thermoplastic resin plate mainly composed of a polyolefin resin such as polypropylene, which is made up of a large number of resin foam strips, and on at least one side thereof, It is characterized by laminated polyolefin thermoplastic resin films, which can prevent splitting from the fused portions of the strips and have excellent surface strength, and can be cut as appropriate or thermoformed to be used in various ways. It can be used for various purposes.

Next, embodiments of the present invention will be described based on the drawings.

Reference numeral 1 indicates a plate-shaped foam that is the main constituent material of the present invention. This plate-shaped foam 1 is a thermoplastic resin foam mainly composed of polyolefin resin such as polypropylene, and has a high density surface and a high density interior. It is made by arranging a large number of low-density resin foam strips 11 in parallel and converging them, and fusing adjacent strips to each other.
Its density is 0.02-0.3 g/cc. The resin foam strips 11, 11 are fused together by simultaneously extruding thermoplastic resin into a large number of strips from a die at the tip of an extruder to foam them, and immediately after extrusion, passing them through a predetermined mold to bring them into close contact with each other. . Therefore, normally, the fused portions between the strips become dense, and a high-density skin layer is formed on the surface of the plate-shaped foam 1. As the plate-shaped foam 1, as shown in FIGS. 1 and 2, one that is molded to a predetermined thickness at the same time as the extrusion and has a skin layer on both sides may be used as is, or one that has a skin layer on both sides as shown in FIG. It is also possible to use one obtained by slicing into a predetermined thickness from a block-shaped one. In any case, the plate-shaped foam 1 preferably has a thickness in the range of 1 to 20 mm, although it varies depending on the use. Thermoplastic resins mainly composed of polyolefin resins include polypropylene resin alone, copolymers of propylene and ethylene, copolymers of propylene, ethylene, and diene monomers such as butadiene, isoprene, and chloroprene, or polypropylene resins. Mixed resins with thermoplastic resins such as polyethylene, polystyrene, polymethyl methacrylate resin, and other olefin-based copolymers, particularly those containing 50% by weight or more of polypropylene, are preferably used.

2 indicates a polyolefin thermoplastic resin film laminated on the surface of the above plate-shaped foam 1. As the resin film 2, a film made of polyethylene resin, polypropylene resin, a copolymer of ethylene and propylene, or a mixture of these resins can be used. It is preferable to use a film of a polymer, and more preferably a film of a copolymer of ethylene, propylene, and a diene monomer such as butadiene, isoprene, or chloroprene. , superior colorability, cold resistance, and weather resistance. The thickness of the resin film 2 varies depending on the thickness of the final product, but is 10~
A thickness within the range of 500μ is used, and among these, a thickness within the range of 20 to 200μ is particularly preferably used from the viewpoint of ease of lamination processing and retention of function as a laminate. Further, the resin film 2 can be used regardless of whether it is transparent or opaque, and whether or not it is colored or printed.
Either side is fine. The resin film 2 may be laminated onto the foam plate 1 by using an adhesive or by heat fusion, but from the viewpoint of heat resistance, the surface of the foam plate 1 or the surface of the resin film 2 may be laminated. It is best to heat it up and press heat bonding.

The embodiment shown in FIG. 1 shows a case in which opaque resin films 2, 2 are laminated on both sides of the relatively thick plate-shaped foam 1 by heat-sealing means, and the embodiment shown in FIG. This shows a case in which an opaque resin film 2 is laminated on one side of a shaped foam 1 via an adhesive 3, and the embodiment shown in FIG. The figure shows a case in which a transparent resin film 2 is laminated on one side of a plate-like foam 1 by heat-sealing means.

As described above, the present invention is a thermoplastic resin foam mainly composed of polyolefin resin such as polypropylene, in which a large number of resin foam strips 11 having high density on the surface and low density on the inside are arranged in parallel and bundled. The main constituent material is a plate-shaped foam 1 made of adjacent strips fused together, and a polyolefin thermoplastic resin film 2 is laminated on at least one side of the plate-shaped foam. 1 is in a state in which a low-density portion and a high-density portion are intertwined by focused fusion of a large number of resin foam strips 11,
Not only does it have excellent compressive strength and stiffness, but it is also prone to cracking and tearing, particularly at the fused portions of the resin foam strips 11, 11 due to the reinforcing effect of the resin film 2 laminated on the surface of the plate-shaped foam 1. It is possible to prevent this from occurring and increase the strength of the entire laminate.
Furthermore, the thickness of the surface layer due to the lamination of the resin film 2 increases the hardness of the surface, resulting in excellent surface strength.

The plate-shaped foam laminate of the present invention as described above can be used for various purposes by taking advantage of its properties such as chemical resistance, heat resistance, heat insulation, moldability, cushioning properties, and compression resistance. For example, low-density products are used in the automobile industry as interior material pads such as instrument panel pads, sun visors, and door inner pads, and in the packaging industry for molding gift sets, packaging, and mounts to provide stiffness. In addition, it can be used in fields that require insulation up to approximately 120°C, such as general insulation around hot water or steam, pipe covers, etc. in industrial insulation materials, and other fields that require insulation at temperatures up to about 120℃.
Possible uses include civil engineering insulation materials, joint materials, buoyancy materials, daily necessities, and miscellaneous goods. In addition to the above-mentioned uses, high-density products can also be used as various structural materials, boxes for heavy objects, pallets, etc.

[Brief explanation of drawings]

1 to 3 are perspective sectional views showing different embodiments of the present invention, respectively. DESCRIPTION OF SYMBOLS 1...Plate foam, 2...Polyolefin thermoplastic resin film, 3...Adhesive, 11...Resin foam strip.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A thermoplastic resin foam mainly composed of polyolefin resin such as polypropylene, which has a large number of resin foam strips with high density on the surface and low density on the inside arranged in parallel and bundled. The main constituent material is a plate-shaped foam with a density of 0.02 to 0.3 g/cc, which is made by fusing adjacent strips to each other, and at least one side thereof has
A plate-shaped foam laminate characterized by being formed by laminating polyolefin thermoplastic resin films having a thickness of 10 to 500μ. 2. The thermoplastic resin foam is a polypropylene resin, a copolymer of propylene and ethylene, a copolymer of propylene, ethylene, and a diene monomer, a polypropylene resin and a thermoplastic resin such as polyethylene, polystyrene, or polymethyl methacrylate resin. The plate-shaped foam laminate according to claim 1, which is a foam made of a mixed resin containing 50% by weight or more of polypropylene. 3 Utility model registration in which the polyolefin thermoplastic resin forming the film is polypropylene resin, polyethylene resin, a copolymer of ethylene and propylene, a copolymer of ethylene, propylene, and a diene monomer, or a resin in which these are mixed. A plate-like laminate according to claim 1.