Plastic and nonmetallic article shaping or treating: processes – Direct application of fluid pressure differential to... – Including application of internal fluid pressure to hollow...
Patent
1998-09-04
2000-12-05
Davis, Robert
Plastic and nonmetallic article shaping or treating: processes
Direct application of fluid pressure differential to...
Including application of internal fluid pressure to hollow...
264535, 264537, 425526, 425529, 425533, 425534, B29C 4906, B29C 4964
Patent
active
061562580
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a system and method of injection blow molding and injection molding device, and particularly to a system and method of injection blow molding in which preforms are injection molded before temperature regulating, and then blow molded into containers.
2. Description of the Prior Art
One of the injection blow molding systems for molding containers is described in Japanese Patent Publication No. 3-45692, for example.
The injection blow molding system described in this Japanese Patent Publication No. 3-45692 is shown in FIG. 15 of the accompany drawings and comprises an injection molding station 2, a first temperature regulating station 4, a second temperature regulating station 6, a blow molding station 8 and a removing station 10, all of which are arranged in a line.
The injection molding station 2 simultaneously injection molds two rows of four preforms 12 arranged in a direction perpendicular to a preform carrying direction shown by an arrow in this figure. The pitch P1 between two rows of the injection molded preforms 12 (which will be referred to "the injection molding pitch P1") is then changed to a larger pitch P2 for blow molding in the blow molding station 8(which will be referred to "the blow molding pitch P2"). The preforms 12 are then carried through the first and second temperature regulating stations 4, 6, blow molding station 8 and removing station 10 while the blow molding pitch P2 is maintained.
In the injection molding station 2, the preforms 12 are injection molded and carried in their upright state.
Since the injection blow molding system of Japanese Patent Publication No. 3-45692 is designed to change the injection molding pitch P1 to the blow molding pitch P2 immediately after the preforms 12 have been injection molded, the preforms 12 will be carried with this larger pitch P2 from the injection molding station 2 through the first and second temperature regulating stations 4, 6 to the blow molding station 8. This causes a waste of space in the first and second temperature regulating stations 4, 6, resulting in increase of the entire system size and manufacturing cost.
When beverage containers or the like are to be molded by such a system, it is desired to maintain the molding room clean. When such a clean atmosphere is to be maintained in the larger area, the installation and maintenance costs will be increased. To avoid this, it is important to reduce the area of installation as small as possible.
Furthermore, such an injection blow molding system is designed to carry the upright preforms 12. When the preforms 12 are heated, the necks of the erected preforms 12 may be excessively heated to be undesirably deformed because the necks of the preforms 12 are topped and the heat moves upward. In this case, further, carrying members used to carry the preforms may also be adversely affected by the heat.
Since the preforms 12 are blow molded by the blow molding station 8 in their upright state, the necessary parts for blow molding the preforms 12 such as stretching rods and others must be placed above the preforms 12. This will increase the entire height of the system and raise a problem in the installation space and maintenance.
SUMMARY OF THE INVENTION
An object of the present invention is to prevent any wasteful use of space when carrying the preforms and to improve the efficiency on molding.
Another object of the present invention is to reduce the installation area of the system to as small as possible.
Still another object of the present invention is to prevent the necks of the preforms from being excessively heated and also to avoid the preform carrying members from being adversely affected by the heat.
A further object of the present invention is to reduce the entire height of the system and also the installation space and also to facilitate the maintenance.
According to one aspect of the present invention, an injection blow molding system comprises: first direction; molding station and delivering th
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Netsu Yoichi
Sakurai Atsushi
Sato Koichi
Takada Minoru
Tsuchiya Yoichi
Davis Robert
Hoffman, Esq. David L.
Nissei ASB Machine Co. Ltd.
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