Die cavity structure, die design method, blowing method and blowing control system

Abstract

The invention discloses a mold cavity structure, a mold design method, a blowing method and a blowing control system, and belongs to the technical field of blowing forming, the mold cavity structure comprises a mold cavity half mold and at least one first insert which are combined to form a mold cavity main body, and the mold cavity half mold is provided with a first forming surface for at least limiting part of the main body shape of a container; the first insert is provided with a second forming surface for at least limiting part of the main body shape of the container, the first insert is at least provided with a first position for initially stretching into the mold cavity main body and a second position for limiting part of the main body shape by the second forming surface after the first insert retracts, and the first insert can be suitable for blowing forming of the container with an irregular shape; and the device is also suitable for blowing forming of specific containers.

Description

technical field [0001] The invention belongs to the technical field of blow molding, and specifically relates to a mold cavity structure, a mold design method, a blow molding method and a blow molding control system. Background technique [0002] In the prior art, the container is formed by blowing the container blank in the blowing mold. During the blowing process, the heated container blank is stretched and then is axially displaced and radially displaced and then attached to the bottle. Cavities to form containers. [0003] Containers with regular shapes (such as containers with a square or cylindrical radial cross-section) are formed by uniform radial displacement along the circumferential direction, and the wall thickness of the container formed by blowing is uniform. [0004] However, for a container with an irregular shape (such as a container with a rectangular, oval, oval, etc. radial cross-section), the radial displacement along the circumferential direction is in...

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Problems solved by technology

[0004] However, for containers with irregular shapes (such as containers with rectangular, oval, and oblong radial cross-sections), the radial displacement along the circumference is inconsistent. Taking a container with a rectangular radial cross-section as an example, the radial displacement of the container There are long sides and short sides in the cross-section. When the container is formed, the radial displacement of the long side and the short side along the circumference is inconsistent. During the radial displacement process of container blowing, the part of the container blank that forms the short side first contacts the cavity, and the container blank is formed. The part of the short side is cooled first, so that the plastic of this part becomes thicker due to the decrease of ductility; the plastic of the part forming the long side of the container blank maintains good ductility and continues to stretch, and has a thinner thickness than the short side, resulting in The container formed by blowing has the problem of uneven wall thickness

[0005] In addition, for a specific container (such as a container with a handle), it is necessary to increase the local wall thickness of the container when blowing, which is difficult to achieve or control with traditional blowing molds and blowing methods

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