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...

AI Technical Summary

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 movement is not uniform, resulting in Piston 3 rotates or twists, causing gas to enter the rubber cartridge 1, forming an air lock, and making piston 3 unable to move; or the glue is discharged from the glue outlet to form glue spraying, which poses a serious safety hazard

In addition, usually the glue outlet of the rubber cartridge 1 needs to be connected with the glue gun through the glue outlet joint 6. Since the glue cartridge 1 is inverted, it is often difficult to align the glue outlet with the glue outlet joint 6, resulting in a The excessive wear of the sealing ring 7 of 6 affects the sealing effect, and because the rubber cartridge 1 has no fixed structure in the tank body 2, the compressed gas in the tank body 2 can easily enter the rubber cartridge 1 through the failed sealing ring 7 , forming an air lock, which makes the piston 3 unable to move; or the colloid is discharged from the glue outlet to form glue spraying, which poses a serious safety hazard

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