JPS5814308B2 - How to manufacture eaves gutters - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing an eaves gutter in which a spring steel plate is coated with a soft synthetic resin.

Conventionally, when manufacturing eaves gutters in which both sides of a metal plate are coated with synthetic resin, both sides of a flat metal plate are coated with synthetic resin, and then this is formed into a U-shaped or U-shaped cross section. Therefore, when molding into a U-shaped or U-shaped cross section, not only is a molding process using a molding machine such as a press or a roller required, but the synthetic resin layer may deteriorate or become distorted during molding. There were drawbacks.

The present invention was invented in view of the above points, and an object of the present invention is to provide a method for manufacturing eaves gutters in which the synthetic resin layer does not deteriorate or become distorted.

The present invention will be explained in detail below.

The manufacturing method of the eaves gutter of the present invention is to forcibly expand a gutter-shaped spring steel plate 1 having a substantially U-shaped or U-shaped cross section into a flat shape, and in the flat state, both sides of the spring steel plate 1 are made of soft composite material. This is characterized in that the spring steel plate 1 is coated with a resin layer 2, and then the external force that had forced the spring steel plate 1 into a flat state is removed, and the spring steel plate 1 is elastically restored to a gutter shape having a substantially U-shaped or substantially U-shaped cross section.

Next, the present invention will be explained in more detail with reference to Examples.

In the figure, 1 is a spring steel plate, and this spring steel plate 1 has a cross section of approximately U.
It has a gutter-like shape or a substantially U-shape, and is in a normal state in this gutter-like state, and this state is maintained as long as no external force is applied.

The spring steel plate 1 is, for example, JIS standard, SUP6, SU
P7, SUP9, etc., and the thickness is 0.35~0. 5
It is mm.

However, the gutter-shaped spring steel plate 1 having a substantially U-shaped or U-shaped cross section is forcibly expanded into a flat shape, and a soft synthetic resin layer 2 is coated on both sides of the spring steel plate 1 in the flat state. do.

Such a soft synthetic resin is, for example, polyvinyl chloride (including foamed resin) and has a thickness of 0.1 to 0.35 mm.

Thereafter, the external force that forced the spring steel plate 1 into a flat state is removed, and the spring steel plate 1 coated with the soft synthetic resin layer 2 on both sides by the restoring spring force of the spring steel plate 1 is shaped into a gutter with a substantially U-shaped or U-shaped cross section. It elastically restores its shape and forms the eaves gutter A.

FIG. 2 also shows an apparatus for coating the soft synthetic resin layer 2. As shown in FIG.

Reference numeral 3 is a crosshead type extrusion molding machine, in which a pair of rolls 4 and 5 are provided at the front and rear of the extrusion molding machine 3, and a cooler 6 is provided in front of the roll 5 (with the forward direction being the front). A cutting machine (not shown) is disposed in front of the cooler 6.

Therefore, the gutter-shaped spring steel plate 1 has a substantially U-shaped or U-shaped cross section.
is rolled out into a flat shape with rolls 4, coated with a soft synthetic resin layer 2 on spring steel plate 1 with an extrusion molding machine 3, cooled with a cooler 9 via rolls 5, and cut into appropriate dimensions with a cutting machine. disconnected.

FIG. 3 shows another embodiment described above, in which a gutter-shaped spring steel plate 1 is stretched flat with a roll 7, sheet-shaped soft synthetic resin layers 2 are stacked on both sides of the spring steel plate 1, and a roll 8 It is to be attached at

In the present invention, as described above, a gutter-shaped spring steel plate having a substantially U-shaped or U-shaped cross section is forcibly expanded into a flat shape, and in the flat state, a soft composite is applied to both sides of the spring steel plate. After coating with a resin layer, the external force that forced the spring steel plate into a flat shape is removed, so that the spring steel plate with a soft synthetic resin layer coated on both sides becomes approximately U-shaped or C-shaped in cross section due to the restoring spring force of the spring steel plate. It elastically restores itself to the shape of a gutter, and does not require a forming process to bend into a roughly U-shaped or U-shaped cross section as in the past. Since it is restored by force, the soft synthetic resin layer does not deteriorate or become distorted compared to those that are directly deformed by a press or rollers, etc. Furthermore, in this case, since it is a soft synthetic resin layer, the soft synthetic resin layer is not deformed when the spring steel plate is restored. It has the advantage of being able to absorb the force applied to the resin layer and not causing further deterioration or distortion.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram showing the manufacturing order of the present invention, Figures 2 and 3.
The figure is a perspective view showing a specific example of the same as the above, in which 1 is a spring steel plate and 2 is a soft synthetic resin layer.

Claims (1)

[Claims] 1. A gutter-shaped spring steel plate with a roughly U-shaped or U-shaped cross section is forcibly rolled out into a flat shape, and both sides of the spring steel plate are coated with a soft synthetic resin layer in the flat state, and then the spring steel plate is A method for manufacturing an eaves gutter, characterized by removing an external force that had forced the gutter into a flat shape, and elastically restoring the gutter to a gutter having a substantially U-shaped or U-shaped cross section.