A kind of heat-shrinkable e-pet composite film and its manufacturing method

Abstract

The invention relates to a heat shrinkable E-PET composite membrane. The heat shrinkable E-PET composite membrane comprises an outer surface layer, a bonding layer and a printing layer, wherein the bonding layer is positioned between the outer surface layer and the printing layer, the outer surface layer is made of a mixture of LLDPE (Linear Low Density Polyethylene) resin and an antiblocking agent, the printing layer is made of a mixture of PETG (Polyethylene Terephthalate Glycol) resin and an antiblocking agent, and the bonding layer is made of styrene block copolymer (SBC) resin. According to a preparation method, the three materials respectively pass through three extrusion and filtration systems, and the three materials respectively correspond to the three extrusion systems; three melts are gathered to a T-shaped die head to extrude a casting piece, and the die head is in a T shape for A, B and C flow channels; two-way stretching, shaping, traction and rolling processes are performed on the casting piece which is extruded and combined by the three materials, so as to prepare the heat shrinkable E-PET composite membrane. The membrane has the advantage of wide shrinkage range and is mainly used for manufacturing a heat shrinkable casing label, and an inner printing mode is adopted for the printing layer which is used as a color pattern bearing layer. The thickness of the shrinkable membrane can be adjusted as required in application, and the shrinkage rate can be adjusted within a shrinkage upper limit as required in application. The heat shrinkable E-PET composite membrane has the advantages of excellent shrinkage and printing performance, simple manufacturing process and strong overall performance.

Description

technical field [0001] The invention relates to the field of packaging materials, in particular to a heat-shrinkable E-PET composite film and a manufacturing method thereof. Background technique [0002] Heat-shrinkable sleeve label belongs to the sleeve label, which is a film label printed on heat-shrinkable plastic film or plastic tube with special ink. When the label is heated, the shrinkable label will quickly shrink along the outer contour of the container. Clings tightly to the surface of the container, creating the effect of "from head to toe" all-round packaging of the bottle. At present, the heat shrinkable films used in the packaging field mainly include polyvinyl chloride (PVC) heat shrinkable films, polyethylene (PE) heat shrinkable films, polystyrene (PS), PETG heat shrinkable films, and multi-layer co-extruded polyolefin heat shrinkable films. membrane (POF), etc. PVC heat shrinkable film has good printing performance, high transparency and good gloss, but th...

AI Technical Summary

Problems solved by technology

Biaxial stretching after tape casting ensures good and consistent shrinkage of PE layer and PETG layer, and solves the problems of wrinkling of the film surface after shrinkage and separation of film layers caused by inconsistent shrinkage of the two materials

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