JP2006198849A - Manufacturing method of eaves trough - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of an eaves trough capable of preventing the occurrence of deformation or molding strain at the time of molding and suitable for manufacturing a composite eaves trough which is partially molded in a multilayered state. <P>SOLUTION: The eaves trough is manufactured by coating a part of the eaves trough main body 1, which is made of a synthetic resin and extruded from an extruder, with a weatherable resin and cooling and shaping the partially coated eaves trough main body 1 by first-third forming dies 23, 24 and 25. This manufacturing method of the eaves trough is characterized in that (1) the partially coated eaves trough main body 1 is quenched by the first forming die 23, (2) the clearance of the eaves trough passing part of the second forming die 24 is 1.1-1.5 times with respect to each of the clearances of the eaves trough passing parts of the first and third forming dies 23 and 25 and (3) annealing treatment is performed by the second forming die 24. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an eaves manufacturing method, and more particularly to an eaves manufacturing method capable of suppressing deformation and molding distortion during molding.

  Conventionally, in an eaves made of synthetic resin, an eaves partially covered with an acrylic resin is often used in order to improve weather resistance. However, such an eaves manufacturing method has a problem that deformation and molding distortion are likely to occur during molding.

  With respect to the above, as a method for suppressing deformation during the formation of rain gutters, for example, in Patent Document 1, in consideration of the crystallization temperature of the resin, a specific cooling method is used in the first to third cooling molds. Moreover, the manufacturing method of the rain gutter using the some vacuum indirect cooling device is disclosed.

  However, the method of Patent Document 1 does not necessarily provide a sufficient effect for the eaves partially formed as described above, and it is difficult to prevent deformation and molding distortion during molding. It was.

JP 2001-98715 A

  An object of the present invention is to provide a manufacturing method of eaves that can prevent deformation during molding and generation of molding distortion and is suitable for a partially multi-layered composite eaves in view of the above-described conventional problems. There is.

The eaves manufacturing method according to claim 1, wherein a part of the eaves main body made of a synthetic resin extruded from an extruder is coated with a weather resistant resin, and is cooled and shaped by first to third forming dies. A manufacturing method of
(1) Rapid cooling with the first forming die,
(2) The clearance of the eaves passage portion of the second forming die is 1.1 to 1.5 times the clearance of the eaves passage portion of the first and third forming dies, and (3) the first Annealing is performed with a two-forming die.

  The method for producing eaves according to claim 2 is the method for producing eaves according to claim 1, wherein the synthetic resin is a vinyl chloride resin and the weather resistant resin is an acrylic resin. .

Hereinafter, the present invention will be described in detail.
The synthetic resin in the present invention is not particularly limited. For example, polyolefin resins such as polyethylene and polypropylene, halogen resins such as vinyl chloride resins, vinylidene chloride resins, fluorine resins, and generally known engineering plastics. Etc.

  In particular, when the synthetic resin is a vinyl chloride resin, deformation and molding distortion are likely to occur, so that the effects of the present invention are particularly remarkable.

  The weather resistant resin in the present invention is not particularly limited, and examples thereof include acrylic resins and polycarbonate resins. In particular, in the case of an acrylic resin, since the deformation and molding distortion at the time of molding are likely to occur as described above, the effect in the present invention is particularly remarkable.

According to the present invention,
(1) Rapid cooling with the first forming die,
(2) The clearance of the eaves passage portion of the second forming die is 1.1 to 1.5 times the clearance of the eaves passage portion of the first and third forming dies, and (3) the first Because it is characterized by annealing treatment with two forming dies, it is caused by the difference in resin characteristics such as linear expansion coefficient and friction resistance value of synthetic resin and weather resistant resin even in partially eaves-molded composite eaves Therefore, it is possible to prevent deformation during molding and occurrence of molding distortion, which can be provided, and a good eaves manufacturing method can be provided.

  In the case where the synthetic resin is a vinyl chloride resin and the weather resistant resin is an acrylic resin, the above effect becomes more remarkable.

The best mode for carrying out the present invention will be described below with reference to the drawings.
FIG. 1 is a schematic cross-sectional view showing an example of eaves manufactured according to the present invention.
In FIG. 1, reference numeral 1 denotes an eaves main body, which is made of a vinyl chloride resin. Reference numeral 11 denotes a long side surface, 12 denotes a front ear portion, 13 denotes a bottom surface, 14 denotes a short side surface, and 15 denotes a rear ear portion. An acrylic resin is laminated as a weather resistant resin in a range from the long side surface 11 to the outer side surface 16 of the front ear portion 12.

  FIG. 2 is a schematic view for explaining an example of a method for manufacturing the eaves. A synthetic resin eaves body 1 extruded from a die 21 attached to the tip of an extruder (not shown) is an acrylic resin using a crosshead die 22 on the outer surface 16 shown in FIG. Are stacked and rapidly cooled by the first forming die 23.

  In the present invention, the rapid cooling means that, in the first forming die 23, the temperature difference between the surface temperature of the eaves at the entrance and the surface temperature of the exit (surface temperature of the entrance portion−surface temperature of the exit portion) is 50 ° C. or more. It means that. If this temperature difference is too small, deformation and deformation are likely to occur due to frictional resistance between the eaves and the forming die due to insufficient cooling.

  After passing through the first forming die 23, the eaves is introduced into the second forming die 24. In the second forming die 24, the clearance of the eaves passage portion is 1.1 to 1.5 times the clearance of the eaves passage portion of the first and third forming dies.

  The clearance may be 1.1 to 1.5 times in all portions of the eaves passage portion, or may be only the portion of the outer surface 13 on which the acrylic resin is laminated, for example.

  Further, the second forming die 24 is annealed. The conditions for the annealing treatment are not particularly limited, but usually 40 to 60 ° C. is preferable. A method of annealing treatment is not particularly limited. For example, a method of heating the forming die 24 using a heater or the like, or a method of blowing warm air using a heating blower or the like may be used.

It is a schematic cross section which shows an example of the eaves bowl manufactured by this invention. It is a line block diagram explaining an example of the manufacturing method of the eaves of this invention.

Explanation of symbols

1 eaves main body 11 long side surface 12 front ear portion 13 bottom surface 14 short side surface 15 rear ear portion 16 outer side surface 21 mold 21
22 Crosshead die 23 First forming die 24 Second forming die 25 Third forming die

Claims (2)

A method for producing eaves eaves in which a weather-resistant resin is coated on a part of eave eaves body made of synthetic resin extruded from an extruder, and cooled and shaped by first to third forming dies,
(1) Rapid cooling with the first forming die,
(2) The clearance of the eaves passage portion of the second forming die is 1.1 to 1.5 times the clearance of the eaves passage portion of the first and third forming dies, and (3) the first An eaves manufacturing method characterized by annealing with a forming die.   The method for producing eaves according to claim 1, wherein the synthetic resin is a vinyl chloride resin and the weather resistant resin is an acrylic resin.

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