JP2000094496A - Eaves trough molding method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an eaves trough molding method in which the after- processing is not required and an eaves trough equivalent to the eaves trough to which bend processing is applied in an extrusion molding process can be obtained. SOLUTION: In an eaves trough molding method, an eaves trough 7 with lugs formed on the upper ends of both side sections and having its opening facing downward is extruded out of an extrusion mold 2 on the end of an extruder 1 and cooled and set while being shaped by a cooling sizing die 4 and then taken off by a take-off mechanism 5, and AES resin having the shrinkage factor larger than that of solid vinyl chloride resin forming the eaves trough 7 is fed from a second extruder 3 for coating connected with the side section of the extrusion mold 2 into the extrusion mold 2 to carry out the coextrusin coating of the outer face side of the eaves lugs of the eaves trough 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming an eaves gutter suitable for construction on a roof of a shrine or a temple.

[0002]

2. Description of the Related Art Heretofore, a curved gutter used for a roof of a shrine or a temple has been formed by post-processing a straight extruded eave gutter. As a method for forming such a curved gutter, for example, in Japanese Patent Publication No. 4-30333, a hard vinyl chloride resin eaves gutter having ear edges on both side edges of a main body having a substantially circular cross section is heated and softened. There is disclosed a method of performing bending processing by sandwiching between a convex member and a concave member.

[0003]

In the above-mentioned conventional post-processing method, the post-processing itself takes a considerable amount of time, so the number of processing steps is limited, and the eaves gutter is reheated to a temperature higher than the softening temperature (for example, In the case of a hard vinyl chloride resin, the temperature is 80 to 140 ° C.), so that there is a problem that variations in product quality such as deformation of the edge of the ear occur. Further, it is necessary to prepare a processing die according to the degree of bending, and there is a problem that the cost is increased.

[0004] It is an object of the present invention to provide a method for forming an eaves gutter which can obtain substantially the same eaves gutter as having been subjected to a bending treatment in an extrusion molding process line without the need for post-processing. It is to provide.

[0005]

According to the first aspect of the present invention, there is provided a gutter-like body having a predetermined cross-sectional shape having lugs at upper ends on both sides thereof, and an extruder at the tip of an extruder with its opening being on the lower side. In a method of forming an eaves gutter which is extruded from a mold and cooled while shaping the gutter-like body with a sizing device, and then taken up by a take-off machine, a second extruder for coating connected to a side portion of the extrusion die. Thus, a resin material for coating having a larger shrinkage rate than the resin material forming the gutter is supplied to the extrusion die, and the resin material for coating is applied to the outer surface side of the ear of the gutter. This is a method of co-extrusion coating.

The resin material forming the gutter in the present invention is not particularly limited, but a hard vinyl chloride resin material is generally used, and the thickness of the gutter is 0.8 to 3.
0 mm is desirable.

The resin material for coating in the present invention may be any resin material having a higher shrinkage ratio than the resin material forming the gutter-like body. Preferably, the shrinkage ratio is larger than the resin material forming the gutter-like body, and
Those having excellent weather resistance are preferred. For example, when the gutter is formed of a hard vinyl chloride resin, acrylic resin such as PMMA resin, A
BS resin, AES resin and the like are suitable.

[0008] The resin material for coating is co-extruded from a second extruder for coating connected to the side of the extrusion die, and is coated on the outer surface side of the ear portion of the gutter-shaped body. But,
As the coating thickness, a predetermined thickness may be determined according to the thickness and degree of curvature of the eaves gutter to be obtained, the cooling temperature in the cooling step, and the like, but it is in the range of 0.08 to 0.3 mm. Is desirable.

(Effect) In the method for forming an eaves gutter according to the present invention, the shrinkage is larger than that of the resin material forming the gutter-like body by the second extruder for coating connected to the extrusion die. Is a method in which a resin material for coating having a ratio is supplied to an extrusion die and coextrusion-coated on the outer surface side of a gutter ear portion of the gutter-shaped body. It is cooled and solidified while being shaped by a sizing device. At the time of this cooling, the coating resin layer covering the outer surface side of the gutter ears has a larger shrinkage ratio than the resin material forming the gutter-like body. Tries to shrink more than the other parts of.

However, since the inner and outer surfaces of the gutter are regulated by the sizing device, the contraction force remains in the gutter as molding distortion. Then, the residual forming distortion is restored after the regulation is released through the sizing device. Then, as a result, the gutter-like body that has been cooled and solidified is taken by a take-off machine,
A bent eaves gutter as shown in FIG. 4 is obtained.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a process explanatory view showing an embodiment of a method for forming an eaves gutter according to the present invention, FIG. 2 is a longitudinal sectional view showing a main part of a cooling sizing step in FIG. 1, and FIG. 3 is an enlarged view showing a main part in FIG. It is sectional drawing.

In FIG. 1, 1 is an extruder, 2 is an extrusion die, 3 is a second extruder, 4 is a cooling sizing die, 5 is a take-off machine, and 6 is a cutting machine.

From the extrusion die 2 attached to the tip of the extruder 1, a trough-like body 7 having a substantially U-shaped cross section and having a front ear 74 and a rear ear 75 at the upper ends on both sides is placed with its opening downward. And extrude horizontally. At that time, as shown in the figure, the extrusion die 2
The tip of a second extruder 3 for coating is connected to a side portion of the gutter-like body 7, and the resin for coating is co-extruded onto the outer surface sides of both ears 74 and 75 of the gutter-like body 7 through the second extruder 3 to perform coating. I can do it.

In this case, the gutter 7 is formed of a hard vinyl chloride resin, and the coating resin is an AES resin. Regarding the molding shrinkage, the rigid vinyl chloride resin had a shrinkage of 0.1%.
Since the AES resin is 2 to 0.3% and the AES resin is 0.5 to 0.7%, the AES resin has a larger shrinkage ratio than the hard vinyl chloride resin. The gutter-like body 7 has a thickness of about 1.3 mm, and is coated on the outer surfaces of both ears 74 and 75.
The thickness of the ES resin layers 74a and 75a is about 0.2 mm. As shown in FIG. 6, the upward part and the inward part of the front ear 74 and the upward part of the rear ear 75 are covered with AES resin, respectively.

The gutter-like body 7 extruded from the extrusion die 2 is shaped and shaped by the cooling sizing die 4.
Cool and solidify. As shown in FIG. 2, the cooling sizing die 4 is composed of an upper die 41 and a lower die 42, and has a gap S for passing a molded product along the cross-sectional shape of the eaves gutter 7 in FIG. Passages 411, 412, 421, and 422 for passing a coolant such as cooling water are provided in the walls of the upper and lower dies 41 and 42 located on the gutter-shaped body 7 side passing through the gap S. The passages 412 and 422 are provided at both ears 74 and 75 of the gutter 7.
Side, and has a smaller diameter than the passages 411 and 421.

Further, as shown in FIG. 3, in the portions corresponding to the ears 74 and 75 of the eaves gutter 7 of the cooling sizing die 4,
A large number of suction holes (not shown) are formed at intervals so that the entire surface of each of the ear portions 74 and 75 can be cooled by suction. Also, the ear 7 of the cooling sizing die 4
At the locations corresponding to 4, 75, there is provided a taper that becomes narrower from the entrance to the exit of the gap S (from left to right in the drawing).

In the case of this molding method, the gutter-like body 7 extruded from the extrusion die 2 is sufficiently cooled and solidified by the cooling sizing die 4. At this time, as shown in FIG.
AES resin 74a, 75a is coated on the outer surface side of 75, and the coating resin layers 74a, 75a have a shrinkage rate about twice that of the hard vinyl chloride resin forming the gutter-like body 7. Therefore, the coating resin layers 74a and 75a tend to shrink more than other portions of the gutter-like body 7.

However, since the inner and outer surfaces of the gutter 7 are regulated by the cooling sizing die 4, the contraction force remains in the gutter 7 as molding distortion (shrinkage stress). Then, the residual molding distortion is caused by the cooling sizing die 4
Will be restored after the regulations are released. Then, as a result, the cooled and solidified gutter-like body 7 is taken out by the take-off machine 5 and cut into a predetermined length by the cutting machine 6, thereby forming the three-dimensionally curved eaves gutter 7 as shown in FIG. Is obtained. The eaves gutter 7 cut to a predetermined length
Is stored on a storage cart or the like.

As shown in FIGS. 4 and 5, the eaves gutter 7 has a curved front wall 72 and a substantially vertical rear wall 73 on both sides of a flat bottom 71. A front ear 74 and a rear ear 75 are provided at the upper end of 73, respectively. The front ear 74 and the rear ear 75 are provided to protrude outward from the upper ends of the side walls. Both ears 74, 75
Are substantially the same in shape, and have grooves 76 and 77 each having a substantially C-shaped cross section and opened to the inside of the gutter.

[0020]

According to the first or second aspect of the present invention, the coating resin material having a higher shrinkage than the resin material forming the gutter-like body is extruded from the second extruder for coating. By supplying to the mold and co-extrusion coating the outer surface side of the gutter ears of the gutter-shaped body, shrinkage force is generated in the coating resin layer coated on the outer surface side of the gutter ears in the shaping and cooling process with the sizing device. Remains as molding distortion. Then, the residual forming distortion is restored after passing through the sizing device, and a curved eaves gutter can be obtained.

As described above, according to the molding method of the present invention, substantially three-dimensional bending processing can be performed in a molding line without performing post-processing as in the related art, which is useful. . In addition, since mass production is possible, the cost is low.

Further, by using a material having excellent weather resistance such as PMMA resin as the resin material for coating, it is possible to obtain an eaves gutter with improved weather resistance of the ear portion. Since the thickness of the coating layer can be reduced, the cost does not increase.

[Brief description of the drawings]

FIG. 1 is a process explanatory view showing one embodiment of a method for forming an eaves gutter according to the present invention.

FIG. 2 is a longitudinal sectional view showing a main part of a cooling sizing step in FIG.

FIG. 3 is an enlarged sectional view showing a main part of FIG. 2;

FIG. 4 is a perspective view showing an eaves gutter obtained by the method of the present invention.

FIG. 5 is a sectional view of the eaves gutter of FIG. 4;

FIG. 6 is an enlarged sectional view showing a main part of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Extruder 2 Extrusion die 3 2nd extruder 4 Cooling sizing die S Void 5 Take-off machine 6 Cutting machine 7 Gutter-shaped body (eave gutter) 74, 75 Gutter ear 74a, 75a AES resin layer

Claims (2)

[Claims] 1. A gutter-like body having a predetermined cross-sectional shape having lugs at upper ends on both sides is extruded from an extrusion die at the tip of an extruder with its opening being on a lower side, and the gutter-like body is sizing apparatus. In a method of forming an eaves gutter to be cooled by shaping and then taken by a take-off machine, a resin material forming the gutter-like body from a second extruder for coating connected to a side portion of the extrusion die. Forming an eaves gutter comprising: supplying a resin material for coating having a larger shrinkage rate to an extrusion die; and co-extrusion coating the resin material for coating on the outer surface side of the lug ears. Method. 2. The coating thickness of the resin material for coating is 0.08.
The method for forming an eaves gutter according to claim 1, wherein the thickness is from 0.3 to 0.3 mm.