Method for extruding high viscosity content and extrusion device

Abstract

The present invention relates to high viscosity material extruding apparatus and process. The apparatus includes one expandable container, one outer cylinder and one cylinder cover. The container includes one straight barrel, one outlet and one piston set inside the straight barrel, and has its bottom connected airtightly to the bottom plate of the outer cylinder to avoid extrusion of compressed gas to the straight barrel. Under the action of both compressed air and the piston, the high viscosity material and the compressed gas push the side wall of the container outwards for expanding to increase the gap between the piston and the inner wall of the container for the high viscosity material to be filled in, so as to form a lubricant interface, decrease the friction between the piston and the inner wall of the container and raise the extruding speed and quality. Filling the gap with the high viscosity material can avoid compressed gas to enter the straight barrel and ensure the extrusion safety.

Description

technical field [0001] The present invention relates to a method and equipment for extruding content, more specifically, to a method and equipment for extruding high-viscosity content. Background technique [0002] Gluing (or dispensing) devices are commonly used equipment in the electronics industry, LED, LCD and other industries, which can apply fluid gel-like materials to another workpiece, for example, apply room temperature curing glue to electronic components, In order to obtain the effect of sealing and waterproofing and increasing the bonding; or apply high-viscosity thermal paste to the bottom surface of electronic components, etc. [0003] The current glue applicator usually puts the glue-like material in the rubber tube, and the rubber tube includes a straight barrel, a glue outlet at one end of the straight barrel, and a piston at the other end of the straight barrel. For example, the "squeeze barrel" of Chinese patent No. 01242370.6 applied on July 17, 2001 use...

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Problems solved by technology

Because during the extrusion action, not only the piston 3 is subjected to the pressure of the compressed gas, but also the outer wall of the straight part of the rubber cartridge 1 is also subjected to the pressure of the compressed gas, so that the outer wall of the rubber cartridge 1 is compressed inward, causing the piston 3 to move. encountered some resistance in the process of

In addition, since the rubber cartridge 1 is usually manufactured by injection molding in a mold, due to the limitation of the production process, the inner wall of the rubber cartridge 1 usually needs to be designed with a certain slope to facilitate operations such as demoulding, and due to the limitation of the process Due to limitations, the inner wall of the piston 3 and the rubber tube 1 cannot be made into a complete circle, and there will be a certain shape difference between the piston 3 and the rubber tube 1, so that the resistance that the piston 3 receives during the mov

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