Physical foaming agent injected plastic extruded microchannel molding device and method

Abstract

The invention discloses physical foaming agent injected plastic extruded microchannel molding device and method. The device comprises a motor, an extruder, a gear pump, a heating ring, a device head, an opening die, a heater, a compressed air supply system, a cooling gas nozzle, a cooling roll, a low-speed depressurization molding die, a foaming agent supply system, a pressure sensor, a temperature sensor and an electric valve. The new method for extruding and molding the high-roundness plastic microchannel has wide application range, high automation degree, simple operation and high molding quality of the plastic microchannel.

Description

technical field [0001] The invention relates to plastic extrusion molding processing technology, in particular to a device and method for injecting physical foaming agent into plastic extrusion microchannels. Background technique [0002] In the prior art, the method of plastic extrusion forming a small-diameter hollow channel is generally by installing a core body in the die of the extruder head, or passing compressed gas into the plastic extrudate through the hollow core body, and extruding The product is further stretched to make the inner diameter of the channel smaller, and finally a small diameter channel is formed. Such as the processing of hollow plastic products such as medical microtubes and hollow fibers, the minimum inner diameter of these plastic products is generally several hundred microns. It is difficult to further reduce the diameter of the hollow channel significantly by traditional methods. This is because this type of method has the following disadvant...

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Problems solved by technology

It is difficult to further reduce the diameter of the hollow channel by traditional methods

This is due to the following deficiencies in this type of method: (1) The inner diameter of the hollow channel is firstly determined by the outer diameter of the core end, which is generally obtained by machining, and the outer diameter is usually a few hundred microns at a minimum

This is limited by the stretching length of the plastic melt, and its effect is very limited; and, for non-axisymmetric hollow channel plastics, the stretch rate is too large, the inner diameter of the hollow channel becomes flat, and the roundness decreases significantly

Therefore, under the premise of ensuring the roundness quality of the hollow channel, it is difficult for the traditional processing technology to reduce the inner diameter of the hollow channel to the micron or even nanometer level.

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