Electric heating die

Abstract

An electric heating die comprises a die shell and an electric heating device in the die shell. The electric heating device comprises an upper-layer annular heating resistor element set surrounding a bottleneck for heating, a middle annular straight inserting columnar heating resistor element set surrounding a bottle body for heating, and a lower-layer annular heating resistor element set surrounding a bottle bottom for heating. The electric heating die is good in heating effect, low in machining cost and simple in structure.

Description

technical field [0001] The invention relates to the field of bottle blowing manufacture, in particular to a bottle blowing mold with an electric heating device. Background technique [0002] The preform needs to be put into an electric heating mold and blown into a container bottle. During the blowing process, it needs to be heated so that the preform can be better stretched to form a container bottle. At present, there are two types of electric heating molds used in the industry: one is to heat the cavity wall of the mold through a preheating fluid (such as water or oil). Since a large heat exchange is required between the cavity wall and the container, it is More preheating fluid is required, and the reserve of preheating fluid is large. Secondly, since the preheating fluid needs to flow to transfer heat, it is necessary to set up a flow channel in the mold. The structure of the flow channel is complicated, which increases the difficulty of making the mold and manufacturi...

AI Technical Summary

Problems solved by technology

At present, there are two types of electric heating molds used in the industry: one is to heat the cavity wall of the mold through a preheating fluid (such as water or oil). Since a large heat exchange is required between the cavity wall and the container, it is More preheating fluid is required, and the reserve of preheating fluid is large. Secondly, since the preheating fluid needs to flow to transfer heat, it is necessary to set up a flow channel in the mold. The structure of the flow channel is complicated, which increases the difficulty of making the mold and manufacturing cost; the other is to heat the mold cavity wall through resistors, as shown in European patent EP1753597, its resistors are arranged at the interface between the mold shell and the bottom mold, when heating, due to the heat volatile from bottom to top The heating effect at the bottom of the container is not good, which affects the molding quality. Secondly, the resistor is in the shape of a coil. Setting the resistor on the bottom mold requires complex processing of the bottom mold, which is difficult and expensive.

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