Movable mould of plastic-adsorption packing box fastener

Abstract

The invention discloses a movable mould of a plastic-adsorption packing box fastener. The movable mould comprises an outer mould and an inner mould, wherein the upper end of the inner mould is spherical and comprises a left arc surface, a right arc surface and a middle annular surface; the left arc surface and the right arc surface are respectively and movably connected with two sides of the middle annular surface through flanges, and the flanges are internally tangent to the inner side surface of the middle annular surface; one or more springs are arranged between the left arc surface and the right arc surface; movable bars are respectively hinged to the centers of inner sides of the left arc surface and the right arc surface; the two movable bars are mutually connected, and a pull rod is hinged to the connecting part of the movable bars; the lower end of the pull rod is internally tangent to a hole of a column at the lower end of the inner mould. Compared with the prior art, the movable mould of the plastic-adsorption packing box fastener has the benefits that the upper end of the inner mould is spherical and comprises the left arc surface, the right arc surface and the middle annular surface, and the left arc surface and the right arc surface can be pulled by the pull rod to be gathered towards the interior of the middle annular surface, so that the formed fastener can realize demoulding easily, and when the pulling force disappears, the left arc surface and the right arc surface are recovered under the elastic force of the springs, the production is performed continuously, and convenience and practicability are realized.

Description

technical field [0001] The invention relates to a movable mold for a fastener of a blister packaging box. Background technique [0002] At the opening of the blister packaging box, there is usually a movable fastener that fits up and down to facilitate opening and fastening. This fastener includes a raised block and a narrow neck. In the existing production process, an inner mold with a fixed shape and an outer mold are used. After the outer mold is closed, compressed air is blown into the plastic sheet to cover the inner mold. After the product is formed, the outer mold is opened and the machine clamps it. The formed fastener is demoulded, but because the neck of the fastener is narrow, it is not easy to demould, or the fastener is damaged during demoulding, and the ejector structure is usually used to assist the demoulding. Contents of the invention [0003] The above problem to be solved by the present invention is to provide a movable mold for the fastener of the blis...

AI Technical Summary

Problems solved by technology

In the existing production process, an inner mold with a fixed shape and an outer mold are used. After the outer mold is closed, compressed air is blown into the plastic sheet to cover the inner mold. After the product is formed, the outer mold is opened and the machine clamps it. The molded fastener is demolded, but because the neck of the fastener is narrow, it is not easy to demould, or the fastener is damaged during demoulding, and the ejector structure is usually used to assist the demoulding

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