Container, injection molding method of container, and mold for injection molding of container

Abstract

The invention discloses a container, an injection molding method of container, and a mold for injection molding of a container. The container, which is provided with a wide opening, and is disposed on the inner side of the container body in an inverted manner, can be used to improve the airtight performance of the container, and can be used to produce the container at low costs. The mold (200) is provided with a neck inside side mold (90),which is provided with a first molding surface capable of continuously molding from inner periphery of the neck part (112) of the container body (110) to the end part (118) of the opening part (117); a first sliding core (50) and a second sliding core (60), which penetrates the neck inside side mold (90), and can be used to form the continuous peripheral inverted buckles (114) facing to the inner periphery of the cylinder part (111) of the container body (110) and the inner periphery of the neck part (112); and a core block (70), which penetrates the neck inside side mold (90), and is configured to be in the area enclosed by the first sliding core (50) and the second sliding core (60).

Description

technical field [0001] The present invention relates to a container, an injection molding method of the container, and a mold for injection molding of the container. More specifically, the container of the present invention is wide-mouthed, and has an undercut (Japanese: アンダーカット) inside the container main body. The injection molding method and the mold for injection molding of the present invention are used in the manufacture of such containers. Background technique [0002] Conventionally, wide-mouthed containers have been known as cosmetic containers for filling, for example, cream-like cosmetic materials. The wide-mouth container is mainly composed of a container body, a sealing gasket and a cover. [0003] The lid is mounted on the neck of the container body. There is also known a container in which the outer diameters of the container body and the lid are substantially the same. The container body of such a container has a difference in outer diameter between the cy...

AI Technical Summary

Problems solved by technology

However, if a stretch core is used, there is a problem that a parting line is formed on the container body at a position corresponding to the split surface of the stretch core.

If a parting line is formed at the opening of the neck of the container body, especially at the end of the opening, the contact pressure between the gasket and the lid will become uneven due to the minute unevenness of the parting line, resulting in an airtight seal. The performance is reduced, and there is a problem that the contents and internal gas leak from the part where the contact pressure is lowered.

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