Blow molding method of flat container
A technology of blow molding and flat containers, which can be applied to household appliances, hollow objects, and other household appliances, etc., and can solve problems such as complicated installation procedures
Active Publication Date: 2011-04-27
FRONTIER CORP +1
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Problems solved by technology
Therefore, there is also a problem that the installation process of the preform in the blow molding mold is complicated.
Moreover, the preform integrally formed with the extension part needs to be carefully handled to avoid damage to the extension part compared with the general test tubular preform, and requires more space for storage and storage
Method used
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[0088] The above example is an example of the case where the present invention is applied to a flat container with a hanging portion. The method of the present invention can also be used in the manufacture of flat containers that do not have a hanger. In this case, the split mold for forming the hanging portion is unnecessary, and the flat container is blow-molded by the following steps.
[0089] (1) The preform heated to a predetermined temperature is introduced into a split mold for blow molding.
[0090] (2) Low-pressure blow air is introduced into the preform almost simultaneously with the start of closing the split mold for blow molding to start free blow molding.
[0091] (3) After a certain period of time, the preform in the free blow molding process comes into contact with the surface of the parting mold for blow molding in the mold clamping process. At this time, the diameter of the preform expanded into a circular shape is larger than the minor axis and smaller tha...
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Provided is a blow molding method of a flat container with a suspension part, wherein the method enables to manufacture a one-piece flat container which has a suspension part and is uniform in wall thickness by using a pre-molded blank of a general shape. Before the arrangement of a general pre-molded blank (11) in the shape of a test tube at left and right parting molds (31, 32) in the mold-opening state for blow molding and after the mold closing, parting molds (33, 34) for forming the suspension part descend so as to clamp the bottom (14) of the pre-molded blank (11) from two sides to lift the blank up, so that the pre-molded blank (11) is stretched. After the stretching, the closing of the parting molds (31, 32) for blow molding is performed, while low temperature blow-molding air is introduced to the pre-molded blank (11) for free blow molding. The pre-molded blank (11) already free blow molded is pressed to form a flat shape by using the parting molds (31, 32) for blow molding, and after the mold closing, high temperature blow-molding air is introduced to a flat container already formed. Meanwhile, the parting molds (33, 34) for forming the suspension part are finally closed for stamping the suspension part (4) to form the bottom of the flat container.
Description
technical field [0001] The present invention relates to a blow molding method for flat containers, which is used for vertically and horizontally stretching and blow molding a bottomed cylindrical preform (Japanese: プリフオラーム) to produce a container for dripping with a flat cross-sectional shape Such as medical containers with hanging parts. Background technique [0002] There are two types of flat containers with hanging parts, such as medical containers (infusion containers) filled with Ringer's solution or physiological saline, and there are bottle-shaped containers and flexible bag-shaped containers. Bottle-shaped containers can be produced by injection stretch blow molding or extrusion blow molding (direct blow molding). In the injection stretch blow molding method, it is not easy to integrally form the hanging portion attached to the bottom of the container with the container during blow molding. Therefore, after the container is formed, the additionally formed hanging ...
Claims
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IPC IPC(8): B29C49/00B29L22/00
Inventor 上原伸一折元宏行
Owner FRONTIER CORP