JPH0430032Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a net-reinforced resin board mainly used for roofing materials of arcades, roofing materials and wall materials of car garages, etc.

[Background Art] Conventionally, this type of resin board has been generally reinforced by using wire mesh or glass fiber net as a reinforcing net and inserting this as a core material. The present applicant has already provided a reinforcing net using glass fiber net, for example, in Japanese Utility Model Application Publication No. 52-49383. As shown in Fig. 4, polyvinyl chloride resin layers 5, 5 are laminated on one side of the glass fiber net 1' and the other side, and both resin layers 5, 5 are laminated on one side of the glass fiber net 1'. The glass fiber net 1' is formed by fusion bonding through a mesh, and the glass fiber net 1' is laminated in the center of the board thickness, that is, each resin layer 5, 5
They were formed with equal thickness. This also applies when a wire mesh is used as the reinforcing net. When the thickness of each resin layer 5, 5 is set equal in this way, the basic strength of the board is exerted by the resin layer 5, but each resin layer 5 is made thicker by the glass fiber net 1'. Since the resin layer 5 is divided into thin sections each having a thickness of half, the strength provided to each resin layer 5 is small, and it is not possible to obtain a very large strength as a whole. Furthermore, since the elasticity of the resin layer 5 is different from that of reinforcing nets such as glass fiber nets or wire meshes, when expansion and contraction occurs due to changes in temperature, the fused portion between the reinforcing net and the resin layer 5 When stress is applied to the resin layer 5, cracks tend to occur in this part, but since each resin layer 5 is formed thin, its resistance to cracking is weak, and in this respect, the strength is also low. It was a decline.

[Purpose of the invention] The present invention has been made in view of the above points, and an object thereof is to provide a net-reinforced resin plate that can improve the strength.

[Disclosure of the invention] The net-reinforced resin plate according to the invention has a thick resin layer 2 made of a polyvinyl chloride sheet on one side of a reinforcing net 1 made of glass fiber.
However, a thin resin layer 3 made of acrylic resin film is laminated on the other side, and the thickness of the thick resin layer 2 is set to be 4 to 14 times that of the thin resin layer 3. is characterized by being fused through the mesh 4 of the reinforcing net 1, and the above object is achieved by increasing the thickness of the resin layer 2 on one side of the reinforcing net 1. The present invention will be described in detail below with reference to Examples.

As the reinforcing net 1, a glass fiber net is used, and is formed to have a mesh 4 of any shape such as a square mesh, a round mesh, or a diamond mesh. When a glass fiber net is used as the reinforcing net 1, the size of the mesh 4 is set to about 3 to 15 meshes, and the glass fiber is used in multiple twisted yarns rather than a single round fiber, and the maximum diameter is
It is best to set it to about 0.03 to 0.2 mm. When the size of the mesh 4 is smaller than about 15 meshes, the fused area of the resin layers 2 and 3 becomes small, resulting in a decrease in fusion strength, and when it is larger than 3 meshes, the reinforcing effect of the glass fiber net 1 can be sufficiently obtained. Furthermore, if the maximum diameter of the glass fiber is too large, there will be a problem in adhesion to the resin layers 2 and 3, and if it is too thin, the reinforcing effect will be poor. A resin layer 2 is laminated on one side of the reinforcing net 1, and a resin layer 3 is laminated on the other side to create a net reinforcing resin plate A. For example, this can be done using an apparatus as shown in FIG. be able to.

First, polyvinyl chloride containing a tin-based stabilizer or the like is extruded into a sheet from the die 7 of an extrusion molding machine 6, and the extruded polyvinyl chloride sheet 8 is guided to a pressure roller 9. On the other hand, an acrylic resin film 10 made of a long acrylic resin such as polymethyl methacrylate,
A reinforcing net 1 also made in a long length is let out from a roll and guided to a pressure roller 9 so that the reinforcing net 1 is sandwiched between a polyvinyl chloride sheet 8 and an acrylic resin film 10. When the polyvinyl chloride sheet 8, the reinforcing net 1, and the acrylic resin film 10 are stacked together and passed through the pressure roller 9, the polyvinyl chloride sheet 8, which is in a softened state immediately after extrusion, is transferred to the reinforcing net 1. The polyvinyl chloride sheet 8 is crimped and
A part of the reinforcing net 1 is fused to the acrylic resin film 10 through the mesh 4 of the reinforcing net 1, resulting in a composite in which the three layers of the polyvinyl chloride sheet 8, the reinforcing net 1, and the acrylic resin film 10 are integrated. A sheet 11 can be obtained. Since the film 10 is fused to the sheet 8 in this way, the film 10 softens very easily and can be easily laminated, and the fusion strength is high and there is no risk of delamination. It is something. This composite sheet 11 is passed through a corrugating device 13 provided with a corrugating roller 12 for corrugation and sizing, and then cut into a predetermined size by a cutting device 14. The cutting device 14 is equipped with wheels 15 and is configured to be self-propelled, and when the cutting device 14 is self-propelled and the actuator member 16 of the limit switch comes into contact with the end surface of the composite sheet 11, cutting is performed. In this way, the cut is made at a predetermined constant size.

In this way, a corrugated net-reinforced resin plate A as shown in FIGS. 1 and 2 can be obtained. For this net-reinforced resin board A, the thickness of the resin layer 2 made of a polyvinyl chloride sheet is, for example, about 0.6 to 0.7 mm, and the thickness of the resin layer 3 made of an acrylic resin film is, for example, 0.05 to 0.15 mm.
The thickness of the resin layer 2 is set to be approximately 4 to 14 times the thickness of the resin layer 3. In other words, the thickness of the net-reinforced resin board A is mostly given by the resin layer 2 made of a polyvinyl chloride sheet. In this way, since the thickness of the resin layer 2 accounts for most of the thickness of the net reinforcing resin plate A, the thick resin layer 2 can be provided without increasing the thickness of the net reinforcing resin plate A itself. The high strength achieved by this method increases the strength of the board as a whole. Also, the resin layer 2 that will be crimped onto the reinforcing net 1
is thick, so reinforcing net 1 and resin layer 2
This makes it possible to improve the crack resistance at the crimped portion with the reinforcing net 1 against stress due to the difference in elasticity between the reinforcing net 1 and the reinforcing net 1. Furthermore, since the resin layer 3 is a thin film as described above, the resin layer 3 at the twisted yarn portion of the reinforcing net 1 may protrude and exhibit a ridge pattern of the mesh 4, but this can be emphasized to reinforce the net. It is also possible to create a mesh pattern on the resin plate A. As mentioned above, since the resin layer 3 is formed of an acrylic resin film, the excellent weather resistance of the acrylic resin can be imparted to the net reinforcing resin board A, which is different from the conventional one shown in FIG. If an acrylic resin film is applied to improve weather resistance, the structure will become a four-layer structure, but a three-layer structure will suffice. Furthermore, since the resin layer 3 of the acrylic resin film is laminated on the resin layer 2 of the polyvinyl chloride sheet, it is possible to form a colored net-reinforcing resin board A by using a colored film, and it is also possible to form a colored net reinforcing resin board A by using a colored film. By using different colors, it becomes possible to easily color code the net-reinforced resin plates A.

In the above embodiment, a corrugated sheet made of synthetic resin has been described, but the corrugated sheet is not limited to this, and various shapes such as a flat sheet or irregularly shaped corrugated sheet may be used. Further, in the above embodiment, the thick resin layer 2 is formed of a sheet that is in a softened state immediately after extrusion of polyvinyl chloride, and the resin layers 2 and 3 are fused by fusing the polyvinyl chloride sheet to the acrylic resin film. However, it is also possible to fuse the sheet and film in a softened state immediately after extrusion, or to use a sheet or film that has been preformed and then use a heating roller or other method to fuse them together. Alternatively, the adhesive may be fused while being heated.

[Effects of the invention] As described above, in the present invention, a thick resin layer made of thermoplastic resin is laminated on one side of the reinforcing net, and a thin resin layer made of thermoplastic resin is laminated on the other side. Each resin layer is fused through the mesh of the reinforcing net, so the high strength of the thick resin layer increases the strength of the entire board without increasing the thickness of the net reinforcing resin board itself. It is something that can increase
In addition, it is possible to improve the crack resistance of the thick resin layer at the fused portion with the reinforcing net against stress due to the difference in elasticity between the reinforcing net and the resin layer. From this point of view as well, the strength of the board as a whole can be increased. In addition, the present invention has a thick resin layer made of polyvinyl chloride sheet laminated on one side of the reinforcing net, and a thin resin layer made of acrylic resin film laminated on the other side. Accordingly, it is possible to easily produce a material with a large difference in thickness between a thick resin layer and a thin resin layer, and by forming the thin resin layer with acrylic resin, weather resistance can be improved. On the other hand, by forming a thick resin layer with polyvinyl chloride, the resin board can be manufactured cheaply using polyvinyl chloride, which has low raw material costs, and the strength of the resin board can be increased using polyvinyl chloride resin, which has excellent strength. It is something that can be obtained. Furthermore, in this invention, since the thickness of the thick resin layer is set to be 4 to 14 times that of the thin resin layer, the difference in thickness between the thick resin layer and the thin resin layer is increased to increase the thickness of the thick resin layer. The effect of thermal expansion and contraction of the thin resin layer on the thermal expansion and contraction of the resin layer can be reduced, and even though polyvinyl chloride and acrylic resin are laminated, the resin plate will not warp due to the difference in thermal expansion and contraction between them. In addition, since it uses a reinforcing net made of glass fiber, the reinforcing net made of glass fiber is softer than wire mesh, etc. , it is possible to prevent the occurrence of unevenness on the surface of a thin layer due to the presence of reinforcing nets, and the resin plate can be easily bent and molded into a wave shape, etc., and there is no risk of rusting. This has the advantage that there is no

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an enlarged thickness of one embodiment of the present invention, Fig. 2 is a perspective view of the same, and Fig. 3 is a perspective view of the same.
The figure is a schematic diagram of the manufacturing apparatus same as above, and FIG. 4 is a sectional view of the conventional example. 1 is a reinforcing net, 2 is a thick resin layer, 3 is a thin resin layer, and 4 is a mesh.

Claims (1)

[Scope of utility model registration request] A reinforcing net made of glass fiber is laminated with a thick resin layer made of polyvinyl chloride sheet on one side, and a thin resin layer made of acrylic resin film on the other side, and the thick resin layer is laminated with a thin resin layer. This is a net-reinforced resin board in which the thickness is set to 4 to 14 times the number of layers, and each resin layer is fused through the mesh of a reinforcing net.