JPH0217068Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to rain gutters constructed at the eaves of houses, etc.

This type of rain gutter, which is made by extruding a single layer of synthetic resin such as polyvinyl chloride, is not only prone to thermal expansion and contraction due to changes in temperature;
It has the disadvantage that it tends to meander as it expands and contracts due to heat. In addition, such rain gutters have the disadvantage that they have poor impact resistance and easily crack or break due to external forces. As a rain gutter that can overcome these difficulties, a rain gutter is known in which a covering layer made of synthetic resin is adhered to both sides of a core material. Conventionally, as the core material in this case, paper impregnated with a thermosetting resin such as phenol, an iron plate, a wire mesh, etc. have been used.

However, when forming rain gutters whose core material is thermosetting resin-impregnated paper, the core material is extruded from an extruder together with a high-temperature molten synthetic resin of 200 to 300 degrees Celsius, and the core material is inserted into a specified position from the front of the extruder. Since the method used was to constantly pull the material under a tension of 100 mL, the material was often torn off due to the tension at high temperatures, creating a problem that required sophisticated molding technology. On the other hand, with rain gutters that use iron plates as the core material, it is difficult to increase the adhesion between the synthetic resin coating layer and the core material, and if this adhesion is not maintained well, water infiltration and air gaps may occur. There was a problem that the core material was easily corroded due to its presence. Another problem was that the rain gutters became heavy due to the weight of the steel plate used as the core material. Furthermore, rain gutters with wire mesh as a core material used wire mesh with a relatively large mesh as the core material, so when the core material was pulled from the front of the extruder during molding, the mesh was not properly aligned. There are cases where the molded rain gutter collapses and deforms, and then comes into close contact with the synthetic resin coating layer.When this happens, there is a problem in that the strength of the molded rain gutter tends to be uneven in different parts. In addition, if the mesh is large, the mesh shape is easily deformed, so it cannot sufficiently prevent the coating layer from expanding and contracting due to changes in temperature.Furthermore, the synthetic resin coating layer gets into the mesh, creating unevenness on the rain gutter surface. There was also the problem of being exposed.

This invention solves the various problems mentioned above, namely, thermal expansion and contraction due to temperature changes and the accompanying meandering, impact resistance, adhesion between the core material and the synthetic resin coating layer when using a core material, and rain gutter. The purpose is to solve problems related to weight, molding technology, etc.

A means to solve this problem is to use a woven fabric whose core material is a metal wire material with excellent corrosion resistance such as stainless steel, copper, or aluminum woven into a woven fabric, and the wire diameter of the metal wire material is is 0.2 to 0.01 mm and the mesh size is 100 to 300 meshes.

Examples will be described below.

The rain gutter illustrated in FIG. 1 includes a semi-cylindrical water receiving portion 1 and ear portions 2 integrally formed at both ends thereof. As is clear from FIG. 2, the water receiver 1 is made up of a core material 11 over the entire length of the water receiver 1, and covering layers 12, 12 made of synthetic resin are adhered to both sides of the core material 11. Core material 1
1 is made of a fabric 111 constructed by weaving metal wire material with excellent corrosion resistance into a woven fabric. Specifically, metal wire materials with excellent corrosion resistance include stainless steel, copper,
In addition to aluminum, steel wire that has been subjected to corrosion-resistant treatment such as galvanizing may be used. Also,
The fabric 111 is woven in the form of a woven fabric, and is limited to metal wires having a wire diameter of 0.2 to 0.01 mm and a mesh size of 100 to 300 meshes. This is done in order to avoid the situation where the mesh is easily deformed from its normal state when the core material 11 is constantly pulled from the front of the extruder when molding rain gutters, and to prevent the core material 11 from becoming easily deformed. This is to avoid the situation where the coating layers 12, 12 on both sides undergo large thermal expansion and contraction due to changes in temperature, and in order to sufficiently have such an effect, the surface of the synthetic resin coating layers 12, 12 is made uneven. This is to prevent it from happening. If the mesh size is larger than 100 meshes, the mesh will easily deform due to tension, and the synthetic resin will likely enter between the meshes, causing unevenness on the surface. If the mesh size is smaller than 300 meshes, advanced technology is required to manufacture it. and the price will be higher. The fabric 111 having meshes of this size has transparency even though it is in the form of a woven fabric. Further, when the fabric 111 having a mesh size within the above range is woven into a woven fabric using metal wire, the wire diameter of the metal wire must be 0.2 to 0.01 mm.
If the wire diameter is smaller than 0.01 mm, there are manufacturing technology problems in keeping the mesh size within the above range, and
It is easy to fall into a lack of strength. If the wire diameter is larger than 0.2 mm, there will be problems in manufacturing technology similar to those described above. Depending on the size of the mesh and the wire diameter of the metal wire, it may be impossible to avoid unevenness on the surface of the synthetic resin coating layers 12, 12 when extruding rain gutters. The wire diameter of the metal wire used for the material
The mesh size is 0.2 to 0.01 mm, and the mesh size is 100 to 300 to prevent unevenness from occurring on the surfaces of the coating layers 12, 12. Next, as the synthetic resin constituting the coating layers 12, 12 shown in FIG. 1, for example, polyvinyl chloride may be used.

The rain gutters described above are continuously molded by simultaneously extruding the core material 11 and the synthetic resin from an extruder and constantly pulling the core material 11 from the front of the extruder with a constant tension. When such a molding method is adopted, even if the synthetic resin is in a molten state at a high temperature of 200 to 300°C, the core material will not be torn off because the fabric 111 that constitutes the core material 11 is made of metal. Further, since the molten synthetic resin also penetrates into the inside of the mesh of the core material 11, the coating layers 12, 12 on both the inner and outer surfaces are integrated through the mesh. Therefore, the adhesion between the core material 11 and the covering layers 12, 12 is excellent, and separation between them does not occur during use of the rain gutter. In addition,
If necessary, the core material 11 and the covering layers 12, 12 may be bonded together with an adhesive.

As is clear from the detailed description above, the rain gutter according to the present invention uses a corrosion-resistant metal fabric woven like a woven fabric as the core material, so the core material will not be torn off during extrusion molding. In addition, since the core material prevents thermal expansion and contraction of the coating layer, problems such as meandering due to temperature changes do not occur, and the adhesion between the coating layer and the core material, tensile strength, impact resistance, etc. are also improved. Even if the core material is exposed to the outside, it will not rust. Furthermore, since the core material is woven in the form of a woven fabric, it is naturally lightweight, and as a result, the weight reduction of rain gutters is not hindered by the addition of the core material. Furthermore, the wire diameter of the metal wire used for the core material is
0.2 to 0.01 mm, and the mesh of the woven fabric is 100 to 300 meshes, so the synthetic resin is evenly coated.
No unevenness occurs on the surface of the coating layer, allowing rainwater to flow down smoothly.

[Brief explanation of the drawing]

FIG. 1 is a partial perspective view of a rain gutter according to an embodiment of the present invention, and FIG. 2 is an enlarged cutaway view of part A in FIG. 1. 11... Core material, 111... Woven fabric, 12... Covering layer.

Claims (1)

[Scope of utility model registration request] In a rain gutter in which a coating layer made of synthetic resin is adhered to both sides of a core material, the core material is a fabric made of metal wires such as stainless steel, copper, or aluminum woven into a woven fabric, and the metal The wire diameter of the wire is
A rain gutter characterized by having a mesh size of 0.2 to 0.01 mm and a mesh size of 100 to 300 meshes.