Method for controlling microscopic bubble nucleation in fluid polymer material production and its apparatus

Abstract

A method for controlling microscopic bubble nucleation in fluid polymer material production and its apparatus that utilizes a gas pipe (16) disposed in the conveyance screw shaft (14) of a conventional injection or extraction forming mechanism and, furthermore, a microbubble generating component (18) (such as a microscopic perforation vented metal head or a microscopic perforation ceramic head, etc.) installed at the front extremity of the conveyance screw shaft (14). At the rear extremity of the gas pipe (16), a pressurization pump or a high pressure gas storage tank is admitted from an air intake opening, enabling the gas to be indirectly heated by an electric heater (12) on the materials pipe (11). The high temperature gas is thereafter outputted from the microscopic perforations of the microbubble generating component (18) such that high temperature microscopic bubbles are directly admitted into the section of liquid polymer material which is then uniformly amalgamated by the conveyance screw shaft (14) and then deposited into a forming die (21). As a result, high pressure gas conveyance or termination is controllable; control is afforded as to whether each section of liquid polymer material is microbubble nucleated and amalgamated. The present invention thereby provides a microbubble nucleation production method in which the non-bubble nucleated is at the surface and the bubble nucleated is at the interior section when the liquid polymer material is poured into a forming die (21).

Description

technical field [0001] The invention relates to a method and a device for generating controllable micro-bubble nuclei in a fluid polymer material. A heater is arranged outside the conveying screw to melt the polymer material in the material pipe, and a heater is arranged inside the conveying screw. A gas conveying pipe connected to the micro-bubble generating component at the front end of the conveying screw, by controlling the high-pressure gas transmission action of the pressurizing pump or the high-pressure gas storage cylinder, to control the formation of bubble nuclei or No bubble core. Background technique [0002] Generally, the polymer material used in the injection or extrusion molding machine is melted into a fluid, by injecting a physical foaming agent into the polymer material, and after stirring, the polymer contains a mixture of foaming agent unit cells, The mixture is then injected into the molding die to solidify, so that the pressure drop in the mixture pro...

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Problems solved by technology

[0006] 3. It is not easy to control the separation of the non-nucleating part and the nucleating part of the fluid polymer material heated and melted in the material tube, and it is quite difficult to control the required foaming agent ratio and the connection of the non-nuclear part. often unstable

[0007] The injection port of the foaming agent must be equipped with a check valve to prevent the backflow of the polymer material, but this device will increase the cost and failure rate of the equipment

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