Production process of disposable pipette

Abstract

The invention discloses a process for preparing a disposable pipette, one-body drawing forming process is used, the deficiency existed in the welding process is avoided, and through grasp of the process parameters, a qualified pipette is obtained, and especially the pipette nozzle is not fragile; the process comprises the following steps: (1) adding raw material resin into a granulator to obtain a first particle; (2) mixedly adding the first particle and an additive into the granulator to obtain a second particle; (3) adding the second particle into an extruder for extrusion molding to obtain a precursor, wherein the extrusion speed is 20-25m / min, and the extrusion temperature is 150 to 180 DEG C; (4) cutting the precursor to obtain a cutting body, wherein the cutting temperature is 120 to 180 DEG C; (5) stretching the cutting body, cooling to obtain an initial product; wherein the stretching temperature is 200 to 400 DEG C, and the stretching speed is 10-15m / min; and (6) printing the initial product, and installing an filter element to obtain a finished product.

Description

technical field [0001] The invention belongs to the field of experimental equipment, and in particular relates to a production process of a disposable pipette. Background technique [0002] Disposable pipettes can be widely used in clinical and scientific research fields such as tissue culture and bacteriology. The production of pipette in the prior art is mainly the welding method, as the Chinese patent CN103612389 disclosed on March 5, 2014 a kind of pipette production special equipment and production process, after the ingredients are extruded and formed, the pipette The head and nozzle are welded together. However, when welding nozzles and pipe heads, it is easy to cause quality problems such as false welding between nozzles and pipe heads due to air pressure, environment, equipment, etc. It is easy to hang liquid, resulting in unprepared pipetting volume. At present, pipettes are also produced by one-piece stretching and molding, but there are also bottlenecks that a...

AI Technical Summary

Problems solved by technology

However, when welding nozzles and pipe heads, it is easy to cause quality problems such as false welding between nozzles and pipe heads due to air pressure, environment, equipment, etc. Easy to hang liquid, resulting in unprepared pipetting volume

At present, there are also pipettes produced by integral stretching and molding, but there is also a bottleneck that is difficult to break through in technology, that is, the nozzle of the pipette is fragile and the hardness does not meet the requirements.