Preparation method of TPU material protective film

Abstract

The invention discloses a preparation method of a TPU material protective film, which comprises the following steps: S1, pulverizing polyester TPU particles to prepare a liquid A; S2, crushing polytetrafluoroethylene, crushing TPU particles, mixing the two components, and then performing melt mixing to prepare a liquid B; S3, putting the liquid A and the liquid B into a mixer in proportion to obtain a mixed material A; S4, conveying the mixed material A into a dehumidification dryer for drying; S5, extruding the mixed material A to form a film; S6, dragging the finished film in the step S5 through a traction device, achieving the constant tension of traction in a tension closed-loop control mode, so that the stability of the tension is guaranteed; and S7, winding through a winding device. Aiming at the situation that a TPU material covers the interior of a paper box to serve as a protective inner film material, the invention provides a novel manufacturing method of the TPU material, a TPU film which is dry, stable in cutting and stable in mechanical property is generated by controlling a production material, a film extruder and a traction device, and the use effect is good.

Description

technical field [0001] The invention relates to the technical field of material thin films, in particular to a preparation method of a TPU material protective film. Background technique [0002] Cushioning packaging has become one of the indispensable components in the consumption and circulation of commodities. High-quality packaging materials can improve the safety of commodities and reduce the loss of commodities during the circulation of commodities. For valuable electronic products such as tablet computers, if the packaging method is not appropriate, the product will be damaged during the logistics process. It is very important for electronic products to choose a packaging material suitable for the transportation of electronic products. In the past, packaging materials were mostly found in plastic foam, pearl cotton, waste newspapers and cushioning air bags. Among them, plastic foam and pearl cotton are the most used packaging materials in the logistics and transporta...

AI Technical Summary

Problems solved by technology

[0005] Using TPU film as a protective material on the inner wall of the carton has some necessary TPU film property requirements: one is that TPU resin has strong hygroscopicity, and if the granular material contains too much moisture, it will cause processing problems and reduce the quality of the finished product ; One is that TPU melt is very sensitive to shear and temperature, too high shear will lead to product performance degradation, too high temperature will cause melt decomposition, so there are certain requirements for extruder and screw design; TPU film has Good stretch elasticity, keep the stability of the tension and reduce the traction as much as possible during the traction process