Heating mechanism of bottle preform with handle

Abstract

The invention discloses a heating mechanism of a bottle preform with a handle. According to the heating mechanism, a heating area is divided into a low-temperature heating area and a common heating area through a first handle protection plate and a second handle protection plate, by adjusting the power of heating lamp tubes in low-temperature heating area and the power of heating lamp tubes in common heating area, radiation energy and temperature of the heating lamp tubes in respective areas on a plastic bottle preform can be controlled, meanwhile, due to the fact that the first handle protection plate and the second handle protection plate are arranged, mutual direct heat radiation light of the heating lamp tubes in the low-temperature heating area and the common heating area can be blocked, and the mutual oblique radiation light of the heating lamp tubes in the low-temperature heating area and the common heating area can be partially blocked, so that the low-temperature heating of ahandle part of the plastic bottle perform and the common heating of the perform body of the part below the handle are realized. Due to the fact that low-temperature heating of the handle part can be achieved, the problem that a handle of the plastic bottle perform which is provided with the handle and made of PET materials becomes soft and deforms due to heating is avoided, and bottle blowing quality is guaranteed.

Description

technical field [0001] The invention relates to the field of bottle blowing processing equipment, in particular to a preform heating mechanism with a handle. Background technique [0002] At present, plastic bottles with handles (especially plastic milk bottles) on the market are roughly divided into HDPE plastic bottles with built-in handles and PET plastic bottles with rear handles. There are problems with plastic bottles. For plastic bottles made of HDPE, there are three problems: First, plastic bottles made of HDPE can only be formed by extrusion blow molding due to the molding performance of the material (process flow: PE resin raw material → sol → parison extrusion → closed mold → Blowing → holding pressure → cooling → mold opening → product removal (subsequent trimming) and other processes), the mold structure is complex and expensive, the cost of a single set of molds is more than double the cost of PET material molds, and the output is low; the second is HDPE plas...

AI Technical Summary

Problems solved by technology

For plastic bottles made of HDPE, there are three problems: First, plastic bottles made of HDPE can only be formed by extrusion blow molding due to the molding performance of the material (process flow: PE resin raw material → sol → parison extrusion → closed mold → Blowing → holding pressure → cooling → mold opening → product removal (subsequent trimming) and other processes), the mold structure is complex and expensive, the cost of a single set of molds is more than double the cost of PET material molds, and the output is low; the second is HDPE plastic bottles are not strong enough and are easily damaged. During transportation and storage, additional turnover boxes are required to place these HDPE plastic bottles. This not only increases the transportation cost of the manufacturer, but also requires larger storage The third is that there is a lot of waste, and the product needs to be trimmed later; the fourth is that there are many resin materials, which are 30% of the PET resin materials of the same specification; the fifth is that the HDPE material has poor oxygen barrier performance, and the milk in it is easy to oxidize and deteriorate.

For PET plastic bottles, injection stretch blow molding is adopted (process flow: PET resin raw material→drying→melt glue→high pressure injection molding→pressure holding→cooling→mold opening→preform return→tube blank temperature adjustment→mold closing → Stretch blow molding → holding pressure → cooling → mold opening → product removal), although it can solve the problems of the above-mentioned plastic bottles made of HDPE, it has good sealing performance, strong bottle, high oxygen barrier performance, and is transparent and easy Observation and other advantages, but the handle of the current PET plastic bottle needs to be produced by specific equipment and installed on the plastic bottle, therefore, this also requires an additional increase in production costs

To sum up, technicians in this industry consider using PET plastic bottles with handles instead of HDPE plastic bottles with handles. However, PET plastic preforms with handles will The handle does not participate in the blowing process. Therefore, during the heating process, the handle part of the plastic preform must be technically processed to prevent the handle part from becoming soft and deformed due to high temperature during the blowing process, resulting in a built-in handle. PET plastic bottle blowing failed

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