Deep-circular-groove PET plastic bottle preform injection mold and use method thereof

Abstract

The invention provides a deep-circular-groove PET plastic bottle preform injection mold and a use method thereof. The deep-circular-groove PET plastic bottle preform injection mold comprises a first press plate, a second press plate, a cavity plate, a push plate, a mold core, a mold core sleeve, a first bearing plate, a second bearing plate, a backing plate and a fixing plate, wherein the mold core sleeve and the mold core can perform intermittent rotary motion around the central axis of the mold core; and the push plate can perform intermittent extending and retracting reciprocal motion in the axial direction of the mold core. The use method comprises the following steps: 1) the first press plate and the second press plate are fixedly connected to corresponding parts of an injection molding machine through bolts respectively; 2) the injection molding machine is started for mold closing; 3) melted PET plastic is poured into the mold; 4) the injection molding machine performs mold opening after the PET plastic is molded; 5) the mold core sleeve and the mold core rotate, and the push plate moves upwards to demould a product; and 6) the mold core sleeve and the mold core stop rotating, and the push plate moves downwards to reset. The deep-circular-groove PET plastic bottle preform injection mold is reasonable in design, and is favorable for producing deep-circular-groove plastic bottles.

Description

technical field [0001] The invention relates to an injection mold for a plastic preform body with a ring groove, in particular to an injection mold with a deep ring groove on the outside of a plastic bottle made of PET material and an external screw thread at the mouth of the plastic bottle and a use method thereof. Background technique [0002] PET plastic bottles are the most widely used beverage packaging today, and are widely used in many fields such as food, chemical, and pharmaceutical packaging. The surface of PET plastic bottle is smooth and shiny. Good creep resistance, fatigue resistance, friction resistance and dimensional stability, low wear and high hardness, with the greatest toughness among thermoplastics; good electrical insulation performance, less affected by temperature, but poor corona resistance. Non-toxic, weather resistance, good stability against chemicals, low water absorption, resistance to weak acids and organic solvents. [0003] The traditional...

AI Technical Summary

Problems solved by technology

Because the mouth of the ring-groove plastic bottle is provided with external threads, and the outside of the bottle mouth is provided with a ring groove, the injection molding process is used to produce deep-ring groove plastic bottles. Due to defects in the mold design, there are technical problems in product demoulding, especially for PET plastic bottles. Because the material is hard and deformable, it is impossible to produce PET plastic bottles with deep ring grooves. Currently, only shallow ring groove plastic bottles can be produced.

The plastic bottle with a shallow ring groove holds less water, so it needs to add water to the ring groove frequently. If you forget to add water, the lower edge of the bottle cap will be exposed to the water surface, so that the effect of sealing the bottle cap with water cannot be achieved, and the food in the bottle will deteriorate.

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