JPH06336251A - Bottle with polyester handle - Google Patents

Abstract

PURPOSE:To improve the heat resistance of a welded part and prevent deformation when a bottle holds hot contents, by crystallizing at least the welded part of a polyester resin handle welded to a bottle main body made by means of biaxial stretching molding and a heat process. CONSTITUTION:In a bottle, a handle 2 made of polyester resin is welded to a bottle main body 1 made by biaxial stretching molding and a heat treatment. That is, the handle 2 has a grip part 22 and attaching parts 23, and the attaching parts 23 are welded to the bottle main body 1. In this case, at least the welded parts 21 of the handle 2 are crystallized. That is, when the handle 2 is welded at the same time it is made by injection molding, the part near the welded part 21 is crystallized, for example by increasing the injection molding temperature of at least the part near the welded part 21 and gradually cooling it. At this time, because the handle 2 is not stretched, it is heated until large crystals are formed and become white, and this may be used as a basis for crystallization. Thus, the heat resistance of the welded parts 21 is improved and the bottle can hold hot contents.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bottle in which a handle made of polyester resin is welded to a bottle body.

[0002]

2. Description of the Related Art Bottles formed by injection-molding and welding a handle made of polyester resin on a biaxially stretch-molded bottle body, or bottles made by welding a handle made of polyester resin on a bottle body by a separate process Proposed.

[0003]

However, the above conventional bottle with a polyester handle has poor heat resistance and has a problem of being deformed when filled with a content of 75 ° C. or higher. In particular, the mounting part of the handle is deformed. There was a problem that it was easy.

[0004]

DISCLOSURE OF THE INVENTION The present invention is intended to obtain a polyester handle bottle having excellent heat resistance, and the gist of the present invention is to use a polyester resin in a bottle body which is biaxially stretch-molded and heat treated. A bottle with a polyester handle, wherein at least the vicinity of the welded portion of the handle is crystallized in the bottle obtained by welding the handle.

The present invention will be described below with reference to the accompanying drawings. FIG. 1 is a partially cutaway front view showing an example of the bottle with a polyester handle of the present invention.

As shown in FIG. 1, the present invention is a bottle in which a handle 2 made of polyester resin is welded to a bottle body 1 which is biaxially stretch-molded and heat-treated, and at least the welded portion 21 of the handle 2 is crystallized. It is a bottle with a polyester handle characterized by being made.

The bottle body 1 of the present invention may be any one that can be welded to a polyester resin, but is preferably made of a polyester resin such as polyethylene terephthalate, and a parison formed by injection molding the polyester resin is softened by heating to a molding temperature. Then, in order to enhance the heat resistance of the bottle body 1 itself by blow molding in a blow molding die, heat treatment is performed by bringing internal pressure into contact with a heating die heated to a crystallization temperature or higher, for example, 130 to 180 ° C. Need to be kept.

The handle 2 of the present invention is obtained by injection-molding a polyester resin and may be any one having a grip portion 22 and a mounting portion 23. The welded portion 21 is a portion where the mounting portion 23 of the handle 2 is welded to the bottle body 1.

In order to form the welded portion 21, a main body space portion having an inner surface shape substantially corresponding to the outer shape of the bottle main body 1 is provided, and the welded portion 21 of the bottle main body 1 in the main body space portion.
The blow-molded bottle body 1 is mounted in a mold device equipped with an injection molding die for a handle having a communicating portion at a portion corresponding to, and the molten polyester resin for the handle is gripped under an internal pressure. The handle 2 is formed by injecting into the injection mold for use, and the bottle main body 1 is contacted from the communicating portion to be fused and integrated. The injection pressure of the molten resin may be changed stepwise to control the temperature and pressure at the time of contact with the bottle body 1. Alternatively, the handle 2 made of a polyester resin molded in a separate process may be welded by melting the tip of the mounting portion 23 with a heater and applying it to the bottle body 1.

At least the vicinity of the welded portion 21 is crystallized, but of course the entire handle 2 may be crystallized.
At the time of this crystallization, since the handle 2 is not stretched, it may be heated until large spherulites develop and whiten, and may be used as a guide for crystallization.

In order to crystallize at least the welded portion 21 of the handle 2, when the handle 2 is welded at the same time as the injection molding, the temperature of the injection mold at least near the welded portion 21 is raised and then cooled. The heat resistance of the handle 2 is increased by crystallizing the handle portion in the vicinity of this.

[0012]

EFFECT OF THE INVENTION The present invention relates to a bottle obtained by welding a handle made of polyester resin to a bottle body that has been biaxially stretch-molded and heat-treated, and characterized in that at least the welded portion of the handle is crystallized. Since it is a bottle with a handle, not only the heat resistance of the bottle body is improved, but also the heat resistance is improved by crystallization in the vicinity of the welded part of the handle, so that it can withstand filling of contents at 75 ° C or higher as a whole.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view showing an example of a polyester bottle with a handle of the present invention.

[Explanation of symbols]

 1 Bottle body 2 Handle 21 Welded part

Claims (1)

[Claims] 1. A bottle having a polyester handle, which is biaxially stretch-molded and heat-treated, and a handle made of polyester resin is welded to the bottle body, wherein at least the welded portion of the handle is crystallized. .