JPH11320645A - Manufacture of eaves gutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for decorating continuously the side wall surface of a U-shaped eaves gutter at the time of extrusion of the eaves gutter and manufacturing the eaves gutter having an excellent external appearance. SOLUTION: In a method for manufacturing an eaves gutter 4 wherein a hollow part is formed in the lengthwise direction of at least one side wall of the eaves gutter 4 and wavelike indentations (hereinafter called decorating) are given continuously to the outer surface of the part in extrusion, the flow velocity of molten resin of a decorating part is made higher than that of the molten resin of the other part inside an extruding die 2 and the molten resin is extruded from the extruding die 2 with the clearance of the extruding die 2 for the decorating part made narrower than that of the extruding die 2 for the other part at the outlet of the extruding die 2. After the molten resin passes through the extruding die 2, it is made to pass through a cooling sizing device 3 to be solidified and thus the decorating part is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing an eaves gutter having decoration on a side wall surface of the eaves gutter.

[0002]

2. Description of the Related Art Conventionally, a molten resin is generally formed into an approximately U-shape with an extrusion die and extruded to produce an eaves gutter. At the time of extrusion molding of this eaves gutter, a method of continuously decorating the side wall surface of the U-shaped eaves gutter is not performed, and when decoration is necessary for the eaves gutter, generally, it is decorated by post-processing. I was

[0003]

In recent years, the design of buildings has changed, and the appearance of the eaves gutter attached to this building has been changed to change the shape of the eaves gutter or to continuously add the eaves gutter to the side wall surface. The decoration is used to match the eaves gutter with the building, so that the overall appearance can be improved. However,
With the conventional method, it is not possible to decorate the side walls of the eaves gutter continuously during extrusion molding, and if decoration is required on the eaves gutter, it must be decorated by post-processing, which is troublesome. There was a problem that it was troublesome.

An object of the present invention is to pay attention to the above-mentioned problems, and to continuously decorate a side wall surface of a U-shaped eave gutter during extrusion molding of an eave gutter to produce an eave gutter having a good appearance. The idea is to provide a way.

[0005]

DISCLOSURE OF THE INVENTION The present invention has been made to achieve the above-mentioned object, and is made to pass through an extrusion mold to form a hollow portion in a longitudinal direction of at least one side wall of at least one side wall of a substantially U-shaped eaves gutter. Is a method of manufacturing an eaves gutter which is continuously formed and extruded with wavy irregularities (hereinafter referred to as "decoration") on the outer surface of the hollow portion. Make the flow rate of the resin faster than the flow rate of the molten resin in other parts, and make the clearance between the outer core and inner core of the decoration part narrower than that of the other parts at the exit of the extrusion die. Then, the molten resin is extruded from the extrusion die, and decoration is formed on the outer surface of the hollow portion of one side wall. After the molten resin passes through the extrusion die, the molten resin is passed through a cooling sizing device and solidified to form a decoration portion. Things.

[0006] The material of the eaves gutter used in the present invention may be any suitable material as long as it can be extruded, and examples thereof include hard vinyl chloride resin, ABS resin, AES, and polycarbonate resin. The use of an amorphous resin is preferable because the elasticity of the molten resin is higher than that of the crystalline resin, so that the molding becomes easier.

In the present invention, a hollow portion is continuously formed in the longitudinal direction of at least one side wall of the substantially U-shaped eaves gutter, and decoration is continuously formed on the outdoor side surface of the hollow portion.
The side walls of the U-shaped eaves gutter may be on the indoor side, but the side walls on the indoor side of the U-shaped eaves gutter are on the eaves side and cannot be seen from the outside. Those that can be decorated on the target.

In the present invention, the relationship between the flow rate of the molten resin in the decorated portion and the flow rate of the molten resin in the other portions is experimentally determined.
It is preferable that the flow rate of the molten resin in the decorative portion is 1.5 to 3.0 times the flow rate of the molten resin in the other portions.

In the present invention, as a method of changing the flow rate of the molten resin in the decorative portion, if the flow rate of the molten resin in the decorative portion can be made 1.5 to 3.0 times the flow rate of the molten resin in the other portions, Any method may be used, for example, inside the extrusion mold,
It is preferable that the flow path of the molten resin in the decorative portion be expanded from the flow path of the molten resin in the other portions so as to reduce the flow resistance of the molten resin, because the flow velocity can be easily changed.

Further, in the present invention, if a roll having the same shape and pitch as the shape of the decorative portion and the pitch of the unevenness is provided, or if a portion corresponding to the concave portion of the roll is depressurized, the decorative portion is formed by the roll. This is preferable because it is possible to firmly form the decorated portion and to make the shape of the decorated portion and the pitch of the unevenness more uniform.

In the present invention, solidification is performed by passing through a cooling sizing device. The cooling method is as follows. For the decorative portion, gas or liquid is directly sprayed and cooled, and the inside of the decorative portion and other portions are cooled. It is preferable to reduce the pressure and cool it by ordinary vacuum sizing because it can be easily cooled and solidified.

In the present invention, when a hollow portion is provided on one side wall, a decorative portion is provided on the outer surface of the hollow portion, and the inner surface of the hollow portion and other undecorated portions are smoothed. It is preferable that the pushed eaves gutter can be easily pulled. Also, if the inner surface of the hollow part and other parts that are not decorated are smooth, when rainwater flows through the eaves gutter, the rainwater does not hinder the flow of rainwater at the decoration part, There is no accumulation of trash etc.
preferable.

(Operation) After passing through the extrusion die, almost U
A method for manufacturing an eaves gutter in which a hollow portion is continuously formed in the longitudinal direction of at least one side wall of the character-shaped eave gutter, and the outer side surface of the hollow portion is continuously decorated and extruded. In the decoration part, the flow rate of the molten resin is made faster than the flow rate of the molten resin in the other parts, and at the outlet of the extrusion die, the clearance between the outer core and the inner core of the extrusion die of the decoration part is changed to the other part. Since the clearance of the extrusion mold is narrower, when the molten resin is extruded from the extrusion mold, waves are continuously applied to the extruded product due to the difference in the flow of the molten resin between the decorative part and other parts. The decorative portion can be provided continuously in the longitudinal direction of one side wall.

Further, since the hollow portion is continuously formed in the longitudinal direction of one side wall and the outdoor side surface of the hollow portion is continuously decorated, the indoor side surface of the hollow portion is not decorated. As in other parts, the inner peripheral surface of the eaves gutter is made smooth, and rainwater can flow smoothly into the eaves gutter.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to FIGS. FIG. 1 is an explanatory view showing a production line for an eaves gutter, FIG. 2A is a perspective explanatory view showing a part of an eaves gutter obtained by the production method of the present invention, and FIG. FIG. 3 is a cross-sectional view of the eaves gutter, illustrating a state in which a decorative part and other parts are separated.

In FIG. 1, reference numeral 1 denotes an extruder. The extruder 1 includes a hopper 11, a barrel 12, and a screw 13 provided in the barrel 12.
Reference numeral 2 denotes an extrusion die. The extrusion die 2 is attached to the tip of the extruder 1. This extrusion die 2 is composed of an extrusion die 2
Inside, the flow path of the molten resin in the decorative part 41 of the eaves gutter 4 is wider than the flow path of the molten resin in the other part 42. (FIG. 3 shows a state in which the decorative part 41 indicated by oblique lines and the other part 42 indicated by dots are separated.) In addition, decoration is performed near the inside of the outlet of the extrusion die 2. Part 41
Then, the parallel portion of the flow path of the molten resin is set to about 7 mm, the parallel portion of the flow path of the molten resin is set to about 20 mm in the other portion 42, and the clearance between the outer core and the inner core of the extrusion die 2 is set to the decorative portion 41. The clearance is set to 1.5 mm, and the clearance of the mold is set to 1.6 mm in the other portions 42.

Reference numeral 3 denotes a cooling sizing device. The cooling sizing device 3 is configured such that water is directly sprayed on the decorative portion 41, and at the same time, a roll having the same shape as the decorative portion is brought into contact with the decorative portion 41. The inside of the decorative part 41 and the other part 42 are reduced in pressure and vacuum-sized. Numeral 4 denotes an eaves gutter, which is continuously decorated in a hollow portion 43 of an outdoor side wall.

5 is a take-off machine, 6 is a cutting machine, 7
Is a reversing machine. The take-up machine 5 is directly connected to the control unit and placed between the extrusion die 2 and the cutting machine 6 so that the take-up speed can be adjusted by an instruction issued from a control unit (not shown).
The decorated eaves gutter 4 is cut into fixed lengths by a cutting machine 6, and the eaves gutter 4 is turned over by a reversing machine 7 so as to be superimposed on a product cart (not shown).

When the thermoplastic resin (hard vinyl chloride resin) is put into the hopper 11 of the extruder 1 and the extruder 1 is operated, the thermoplastic resin is extruded through the barrel 12 by the rotation of the screw 13. Proceed in the direction of mold 2. While the thermoplastic resin is moving through the barrel 12, the molten resin melted by a heater (not shown) attached around the barrel 12 passes through the extrusion mold 2 and is connected to the eaves gutter 4 by the heater. It has been pushed out.

Inside the extrusion die 2, the flow path of the molten resin in the decorative part 41 is wider than the flow path of the molten resin in the other part 41. The flow resistance is reduced, and the flow velocity of the molten resin in the decorative part 41 can be 1.5 to 3.0 times faster than the flow velocity of the molten resin in the other parts 42. At the exit of the extrusion die 2, the clearance between the outer core and the inner core of the extrusion die 2 of the decorative part 41 is narrower than the clearance of the die of the other part 42, so that the flow of the molten resin is reduced. It is possible to prevent the thickness of the faster part from increasing.

Next, the manufacturing method and operation of the eaves gutter 4 will be described. The thermoplastic resin is put in the hopper 11 of the extruder 1, and the extruder 1 is operated. Then screw 1
By the rotation of 3, the thermoplastic resin in the hopper 11 advances in the barrel 12 toward the mold 2. Next, a heater (not shown) attached around the barrel 12 while the thermoplastic resin is traveling inside the barrel 12
The molten resin melted by the extrusion passes through the extrusion die 2 and becomes the eaves gutter 4 and is extruded. The eaves gutter 4 thus extruded is taken off by the take-off machine 5, cut into fixed lengths by the cutting machine 6, inverted by the reversing machine 7, and placed on the product cart.
Are superimposed.

Next, in order to explain the features of the present invention, data on the molding conditions of Examples 1, 2 and 3 and Comparative Examples 1 and 2 of the product of the present invention, and the appearance of the decorative part of the eaves gutter 4 are described. Are shown in Table 1.

[0023]

[Table 1]

As can be seen from Table 1, inside the extrusion die 2, the flow path of the molten resin in the decorative portion 41 is expanded from the flow path of the molten resin in the other portion 42, and the flow of the molten resin in the decorative portion 41 is increased. If the flow rate is less than 1.5 than the flow rate of the molten resin in the other portion 42, it is difficult to decorate continuously, resulting in uneven unevenness. When the flow rate of the molten resin exceeds 3.0 times, the other undecorated portion 42 is deformed, and the eaves gutter has a distorted shape.

Although the embodiment of the present invention has been described in detail with reference to the drawings, the specific configuration is not limited to this embodiment, and even if there is a design change or the like without departing from the gist of the present invention. Included in the present invention.

[0026]

As described above, according to the method for manufacturing an eaves gutter of the present invention, a hollow portion is continuously formed in the longitudinal direction of at least one side wall of an approximately U-shaped eaves gutter by passing through an extrusion die. This is a method of manufacturing an eaves gutter that is continuously formed with a decoration on the outdoor side surface of the hollow part and extrudes the same. And the clearance between the outer core and the inner core of the extrusion die in the decorative part is made narrower at the exit of the extrusion die, so that the clearance of the extrusion die in the other part is narrower. When extruded from the extrusion mold, due to the difference in the flow of the molten resin between the decorative part and the other part, the extruded product is continuously waved, and the decorative part is continuously formed in the longitudinal direction of one side wall. Can be provided.

Further, since the hollow portion is continuously formed in the longitudinal direction of one side wall and the outdoor side surface of the hollow portion is continuously decorated, the indoor side surface of the hollow portion is not decorated. As in other parts, the inner peripheral surface of the eaves gutter is made smooth, and rainwater can flow smoothly into the eaves gutter. Therefore, the eaves gutter having a good appearance can be manufactured by continuously decorating the side wall surface of the U-shaped eaves gutter during extrusion molding of the eaves gutter.

[0028]

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a production line for eaves gutters.

FIG. 2A is a perspective explanatory view showing a part of an eaves gutter obtained by the manufacturing method of the present invention, and FIG. 2B is a sectional view taken along the line AA of FIG.

FIG. 3 is an explanatory diagram showing a state in which a decorative portion and other portions are separated in a cross section of the eaves gutter.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Extruder 11 Hopper 12 Barrel 13 Screw 2 Die 3 Cooling sizing device 4 Eaves 41 Decorating part 42 Other part 43 Hollow part 5 Take-off machine 6 Cutting machine 7 Reversing machine

Claims (1)

[Claims] 1. A hollow portion is continuously formed in a longitudinal direction of at least one side wall of a substantially U-shaped eave trough by passing through an extrusion die, and a wavy unevenness is continuously formed on an outer surface of the hollow portion. (Hereinafter referred to as "decoration") is a method of manufacturing an eaves gutter which is extruded, and in the extrusion die, the flow rate of the molten resin in the decoration part is made faster than the flow rate of the molten resin in the other parts, so that the extrusion die At the exit, make the clearance between the outer core and inner core of the mold in the decorated part narrower than the clearance of the mold in the other part, extrude the molten resin from the extrusion mold, and decorate the outer surface of the hollow part on one side wall And forming a decorative part by passing the molten resin through an extrusion die and then passing through a cooling sizing device to solidify to form a decorative portion.