JPH0687529U - Eaves gutter - Google Patents

Abstract

(57) [Summary] [Purpose] When cutting eaves gutters to a predetermined length with scissors, eaves gutters that do not crack or peel off the synthetic resin coating layer at the corners of the eaves gutter. I will provide a. [Structure] The eaves gutter is made of synthetic resin coated metal, and the bottom wall 1
And the synthetic resin coating layer near the boundary with the front side wall 2 or the rear side wall 3 is the soft synthetic resin coating layer 7, and the synthetic resin coating layers other than the soft synthetic resin coating layer 7 are the hard synthetic resin coating layers 8. Has been done.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This invention relates to an eaves gutter made of a synthetic resin-coated metal body.

[0002]

[Prior art]

 As a synthetic resin eaves gutter, a hard vinyl chloride resin eaves gutter is generally used, but because of its low softening temperature and large linear expansion coefficient, it can be deformed or meander due to changes in solar heat and temperature. Yes, there was a problem with durability.

Further, eaves gutters made of a metal formed body such as a steel plate and an iron plate have poor corrosion resistance. Therefore, eaves gutters in which a metal molded body is coated with a synthetic resin are known. For example, Japanese Utility Model Application Laid-Open No. 51-123228 proposes a gutter material in which a core material made of a metal plate is coated with a hard synthetic resin material such as vinyl chloride.

[0004]

[Problems to be solved by the device]

 By the way, eaves gutters are often cut into predetermined lengths by scissors during construction, but the cross-sectional shape of the bottom wall and side walls raised from both ends of the bottom wall is U-shaped. In eaves gutters called "waru kaku gutters", when cutting near the corners of the side wall and bottom wall, the corners are cut while being spread by scissors. Therefore, the hard synthetic resin material on the surface layer was cracked, and the hard synthetic resin material was easily peeled off from the metal body.

The present invention has been made in view of the above points, and when the eaves gutter is cut to a predetermined length with scissors, the synthetic resin coating layer at the corner portion of the eaves gutter may be cracked or the synthetic resin may be cut. An object is to provide an eaves gutter in which the coating layer does not peel off.

[0006]

[Means for Solving the Problems]

 The eaves gutter of this invention is a eaves trough composed of a bottom wall and side walls raised from both ends of the bottom wall. The bottom wall and the side wall are made of a synthetic resin-coated metal body, and the vicinity of the boundary between the bottom wall and the side wall. The synthetic resin coating layer is a soft synthetic resin coating layer, and the synthetic resin coating layer other than near the boundary between the bottom wall and the side wall is a hard synthetic resin coating layer.

Examples of the metal body include steel, aluminum, and stainless steel, but the material thereof is not particularly limited. In order to suppress corrosion during use, the metal body is preferably plated with zinc, a zinc alloy, chromium or the like, which has a corrosion prevention effect. Further, in order to improve the adhesiveness with the synthetic resin, degreasing treatment or acid washing treatment may be performed, or a surface chemical conversion treatment layer, a primer layer, an adhesive layer, etc. may be provided. Furthermore, it is possible to improve the adhesion to the synthetic resin by providing irregularities on the surface of the metal body or providing through holes.

Examples of the soft synthetic resin used for the soft synthetic resin coating layer include soft vinyl chloride resin, soft polyacrylic acid ester, nylon, butadiene styrene rubber, low density polyethylene and the like. In particular, a soft synthetic resin having a Young's modulus based on the ASTM standard of 3500 kg / cm ² or less is preferable. Taking a soft vinyl chloride resin as an example, generally, a soft vinyl chloride resin containing about 30 parts by weight or more of a plasticizer with respect to 100 parts by weight of vinyl chloride resin has a Young's modulus of 3500 kg / cm ² or less, which is preferable. Used for.

Examples of the hard synthetic resin used for the hard synthetic resin coating layer include thermoplastic resins such as hard vinyl chloride resin, high-density polyethylene, polystyrene and polyester, phenol resin, urea resin and unsaturated polyester resin. A curable resin may be used. Further, copolymers thereof, alloys, reinforcing bodies of fibers and the like, filled bodies of inorganic fillers and the like can be mentioned.

It is preferable that the soft synthetic resin and the hard synthetic resin have good adhesiveness to each other. As such a combination, for example, when a hard vinyl chloride resin is used as the hard synthetic resin, As the soft synthetic resin, a soft vinyl chloride resin or a soft polyacrylic acid ester is preferably used.

As a method for coating the synthetic resin, extrusion or drawing, injection, pressing, pressure lamination or the like is adopted. In addition, the metal molded body is often formed into an eaves trough shape by molding a metal plate before being coated with a synthetic resin or a synthetic resin-coated metal plate by roll forming, press molding, or the like.

In the eaves gutter of the present invention, a hard synthetic resin coating layer may be formed on the soft synthetic resin coating layer. When the hard synthetic resin coating layer is formed on the soft synthetic resin coating layer as described above, the above-mentioned effects are exhibited, and the shape retention and the shape recoverability are further excellent. It also has the advantage of a uniform appearance.

[0013]

[Action]

 Since the corners of the eaves gutter of this invention are covered with the soft synthetic resin, even if the corners are expanded by the scissors, the soft synthetic resin is deformed following it and cracks and peeling are less likely to occur. .

[0014]

【Example】

 The eaves gutter of this invention will be further described with reference to the drawings. 1 and 2, the eaves trough is composed of a bottom wall 1, a front side wall 2 standing upright at both ends thereof, a rear side wall 3, and hollow ears 5 provided outside the upper ends of the side walls 2 and 3. , 6 are included. Reference numeral 4 denotes a metal body, and both surfaces of the metal body 4 are coated with a synthetic resin to form a bottom wall 1, a front side wall 2, a rear side wall 3, and parts of the ears 5, 6. In the vicinity of the boundary portion (corner portion) between the bottom wall 1 and the front side wall 2 or the rear side wall 3, both sides of the metal body 4 are soft vinyl chloride resin coating layers 7, and the other portions are hard vinyl chloride resin coating layers. It is supposed to be 8.

FIG. 3 is a cross-sectional view of a corner portion of an eaves trough according to another embodiment. A front side wall 2a and a rear side wall (not shown) are erected at both ends of a bottom wall 1a, and upper end portions of both side walls are outside. Ears (not shown) are formed on one side. The ears may have shapes and structures other than those shown in FIG. The bottom wall 1a, the front side wall 2a, and the rear side wall are made of metal bodies 4a coated with synthetic resin on both sides, as in the eaves gutter of FIG. 1. In the vicinity of the boundary (corner), soft vinyl chloride resin coating layers 7a are formed on both surfaces of the metal body 4a, and the hard vinyl chloride resin is formed on the soft vinyl chloride resin coating layer 7a and the entire surface of the other metal body 4a. The coating layer 8a is formed.

The eaves gutter as shown in FIGS. 1 and 2 was manufactured by the method shown in FIG. A 0.5 mm thick soft vinyl chloride resin sheet B (polyvinyl chloride resin 100) is formed on both surfaces of the 2.0 mm thick chromate-treated galvanized steel sheet A in the vicinity of the boundary between the bottom wall and the side wall. Then, 30 parts by weight of a plasticizer was added to 1 part by weight of the plasticizer and the mixture was attached by a heating roll C and sent to a roll forming device D. In the roll forming apparatus D, the galvanized steel sheet A was sequentially bent to thereby erect the side walls at both ends of the bottom wall, and the upper end edges of the side walls were bent into a substantially U-shape to form an eaves gutter E. This eaves trough E is sent to the crosshead mold G attached to the tip of the extruder F, and the hard vinyl chloride resin extruded from the extruder F to the portion where the soft vinyl chloride resin sheet B is not attached. Was coated to a thickness of 0.8 mm to produce eaves gutter (Example 1).

As shown in FIG. 3, an eaves trough in which a hard vinyl chloride resin layer 8a is formed on the soft vinyl chloride resin coating layer 7a at the corner is installed in the crosshead mold G of the apparatus of FIG. An eaves gutter was manufactured in the same manner as described above except that the entire surface of the eaves gutter E was coated with a hard vinyl chloride resin to a thickness of 0.5 mm (Example 2).

For comparison, an eaves gutter in which only the hard vinyl chloride resin coating layer was formed without providing the soft vinyl chloride resin coating layer at the corner was manufactured. That is, in the apparatus shown in FIG. 4, without using the heating roll C and without sticking the soft vinyl chloride resin sheet, the chromate-treated zinc plated steel sheet A having a thickness of 2.0 mm is provided in the roll forming apparatus D. Then, the side walls were erected at both ends of the bottom wall by sequentially bending, and the upper end edges of the side walls were bent into a substantially U-shape to form an eaves-shaped body E. The eaves gutter E is sent to a crosshead mold G attached to the tip of the extruder F, and the hard vinyl chloride resin extruded from the extruder F is coated with a thickness of 0.5 mm to form the eaves gutter. It was manufactured (comparative example).

The eaves gutters thus manufactured were each cut into a length of 50 cm, and stress was applied to the front side wall to open the corners as shown in FIG. 5, so that the deformation resistance of each corner and the stress were removed. The eaves gutter's shape recoverability was evaluated. The results are shown in Table 1.

[0020]

[Table 1]

[0021]

[Effect of device]

 As mentioned above, the eaves gutter of this invention does not crack or peel when the stress that expands the corners is applied, and the soft synthetic resin coating layer deforms following it. Eaves gutters can be easily and reliably cut, and defective products will not be generated due to cutting. In addition, since the hard synthetic resin coating layer is formed except in the vicinity of the corners, it is difficult to deform and is easy to handle.

[Brief description of drawings]

FIG. 1 is a sectional view of an eaves gutter of the present invention.

FIG. 2 is a cross-sectional view of a portion (corner portion) near a boundary portion between a bottom wall and a side wall of the eaves gutter of FIG.

FIG. 3 is a cross-sectional view of a portion (corner portion) near a boundary between a bottom wall and a side wall of an eaves trough according to another embodiment.

FIG. 4 is an explanatory diagram showing an example of a method for manufacturing an eaves gutter.

FIG. 5 is an explanatory diagram of a method for measuring deformation resistance and shape recoverability of eaves gutters.

[Explanation of symbols]

 1, 1a Bottom wall 2, 2a Front side wall 3 Rear side wall 4 Metal body 5, 6 Ears 7, 7a Soft vinyl chloride resin coating layer 8, 8a Hard vinyl chloride resin coating layer

Claims (1)

[Scope of utility model registration request] 1. An eaves trough comprising a bottom wall and side walls raised from both ends of the bottom wall, wherein the bottom wall and the side wall are made of a synthetic resin-coated metal body, and the vicinity of the boundary between the bottom wall and the side wall is made of synthetic material. The eaves trough, wherein the resin coating layer is a soft synthetic resin coating layer, and the synthetic resin coating layer other than near the boundary between the bottom wall and the side wall is a hard synthetic resin coating layer.