Primary mold of bottle body with handle and method of manufactur

Details Primary mold of bottle body with handle and method of manufactur Primary mold of bottle body with handle and method of manufactur

1995-04-04

1998-08-18

Timm, Catherine

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Including application of internal fluid pressure to hollow...

264530, 428 3692, 4285428, 215398, B29C 4908, B29C 4918, B29B 1106, B29D 2200

Patent

active

057955344

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Field of the Invention
The present invention relates to a primary molded bottle body with a handle piece made of synthetic resin, and a method of manufacturing a bottle body with a handle piece.
2. Description of Related Art
Among synthetic resin made bottles comprising handle pieces, there are known bottles that have handle pieces formed in advance and separately from bodies of bottles and fixed to the bodies thereafter. There are also known bottles that have handle pieces placed to certain positions of bodies of bottles when the bodies were formed to final products.
As a molding material of synthetic resin for bottles containing liquid, crystalline synthetic resin such as polyethylene terephthalete resin (PET) is preferable when mechanical strength and sanitation of bottles are concerned.
To form bottles with PET, it is preferable to use a biaxial stretch molding means because such means brings out an improved mechanical strength characteristic of PET.
Known PET-made bottle bodies having handle pieces include, for example, such bottles as described in Japanese patent provisional publication No. 58-99350 and Japanese utility model publication No. 2-39926. According to a bottle body shown in Japanese patent provisional publication No. 58-99350, a handle piece is formed individually that comprises an engaging portion, such as a protrusion, and is concave at a certain portion thereof. While the bottle body is formed in its complete shape by blow molding, the engaging portion of the handle piece engages with the certain portion of the bottle body as the bottle body expands, stretches and deforms. According to a bottle body shown in the Japanese utility model publication No. 2-39926, a handle piece is provided in which a pair of concaves are formed at both sides of the back portion of the bottle body, and a pair of the concaves functions as a handle piece.
However, according to the former prior art in which the separately formed handle piece is engaged with the bottle body as the bottle body expands and deforms, the engagement of the handle piece and the bottle body is not always tight enough. It is desired that the engagement thereof be strengthened. To strengthen the engagement between the handle piece and the bottle body, there was an idea that the blow pressure for forming the bottle body could be increased. However, as the blow pressure is increased, some problems arise in that the engaging portion of the bottle body with the handle piece cracks and the bottle body irregularly deforms due to the high pressure.
When a separately formed handle piece is engaged with a bottle body that will be stretched by biaxial blow molding, the biaxial stretch blow molding becomes an insert molding style. The structure of a mold for forming such a bottle body would be complicated and a molding operation thereof would be difficult.
According to the latter prior art in which the handle piece is provided at the back of the bottle body by forming a pair of concaves thereto, the handle piece can be unitedly formed with the bottle body so that it is easier to form the bottle. However, according to this prior art, there is a problem that the handle piece does not satisfactorily function as a handle piece so that it is uneasy to handle the bottle.
Especially when the bottle body has a volume thereof of 1.5 liter or more, the handle piece, which is provided by a pair of concaves, can hardly function as a handle piece. It is clear that this type of handle piece cannot be applied to bigger bottles.
Further, according to regular hollow molding bottles (blow molding bottles), there is a handle piece forming means that is a part of the bottle body and, while blow molding, is bit off by a pair of piece molds which forwardly move from opposite sides in the same direction and make contact with each other. The bit off portion naturally adheres tightly, forming a handle piece, as the molding resin has an adhesive characteristic. However, this process cannot be applied to biaxial stretch blow molding bottles b

REFERENCES:
patent: 3665063 (1972-05-01), Rupert et al.
patent: 3944642 (1976-03-01), Uhlig
patent: 3949034 (1976-04-01), Uhlig
patent: 3983199 (1976-09-01), Uhlig
patent: 4280859 (1981-07-01), Thompson
patent: 4374878 (1983-02-01), Jakobsen et al.
patent: 5057266 (1991-10-01), Belcher

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