Mold apparatus, injection molding apparatus, and injection molding method
AssigneeNissei Asb Machine Co., Ltd.
InventorAtsushi Nakahara
Life of this patent
Estimating the term…
Abstract
A mold apparatus, an injection molding apparatus, and an injection molding method, which can satisfactorily form a preform having a bottom thicker than a body, are provided. The mold apparatus comprises a neck mold, an injection cavity mold, and an injection core mold having an inside core mold and an outside core mold, and further comprises a regulation means, such as an urging member, for regulating the movement of the inside core mold toward the outside of the injection cavity mold.
Claims10
An injection molding method for a preform using an injection molding apparatus comprising a mold apparatus for injection-molding a bottomed tubular preform having a neck with an opening portion at an upper end thereof, a body continuous with the neck, and a bottom continuous with the body and larger in wall thickness than the body, comprising a neck mold for forming an outer surface of the neck;
- an injection cavity mold for forming outer surfaces of the body and the bottom of the preform;
- and an injection core mold for forming at least an inner surface of the preform, wherein the injection core mold includes an inside core mold, inserted into the injection cavity mold, for forming the inner surface of the preform, and an outside core mold, having a leading end portion clamped by the neck mold, for forming an upper end surface of the preform and holding the inside core mold slidably in accordance with a change in a pressure within an injection space, and the mold apparatus further comprises regulation means for regulating movement of the inside core mold toward an outside of the injection cavity mold, the method comprising:
- injecting a raw material continuously into the injection space to charge the raw material into the injection space while moving the inside core mold from a first position to a second position;
- and
- then cooling the raw material within the injection space to solidify the raw material, while holding the inside core mold at the second position by continuing injection of the raw material into the injection space.
A mold apparatus for injection-molding a bottomed tubular preform having a neck with an opening portion at an upper end thereof, a body continuous with the neck, and a bottom continuous with the body and larger in wall thickness than the body, comprising:
- a neck mold for forming an outer surface of the neck;
- an injection cavity mold for forming outer surfaces of the body and the bottom of the preform;
- and
- an injection core mold for forming at least an inner surface of the preform,
- wherein the injection core mold includes
- an inside core mold, inserted into the injection cavity mold, for forming the inner surface of the preform, and
- an outside core mold, having a leading end portion clamped by the neck mold, for forming an upper end surface of the preform and holding the inside core mold slidably in accordance with a change in a pressure within an injection space, and
- the mold apparatus further comprises regulation means for regulating movement of the inside core mold toward an outside of the injection cavity mold.
An injection molding apparatus comprising a mold apparatus for injection-molding a bottomed tubular preform having a neck with an opening portion at an upper end thereof, a body continuous with the neck, and a bottom continuous with the body and larger in wall thickness than the body, comprising a neck mold for forming an outer surface of the neck;
- an injection cavity mold for forming outer surfaces of the body and the bottom of the preform;
- and an injection core mold for forming at least an inner surface of the preform, wherein the injection core mold includes an inside core mold, inserted into the injection cavity mold, for forming the inner surface of the preform, and an outside core mold, having a leading end portion clamped by the neck mold, for forming an upper end surface of the preform and holding the inside core mold slidably in accordance with a change in a pressure within an injection space, and the mold apparatus further comprises regulation means for regulating movement of the inside core mold toward an outside of the injection cavity mold.
Dependencies are inferred from the claim text.