PET transfer basement film and preparation method thereof

Abstract

The invention discloses a PET transfer basement film and a preparation method thereof. The PET transfer basement film comprises a core layer and surface layers, wherein the core layer is positioned in the middle of the PET transfer basement film; the surface layers are arranged on the two surfaces of the core layer; the surface layers and the core layers are integrally formed by co-extrusion and bidirectional stretching; the core layer is a PET layer; and each surface layer is a PET layer mixed with an anti-blocking agent. The preparation method comprises the following steps: polyester synthesizing, blending, co-extruding, die head casting, longitudinal stretching, transverse stretching, traction and edge cutting, rolling, slitting and finished product obtaining. The thickness is 12-20 mu m, the breadth is 8,700 mm, the heat resistance temperature exceeds 120 DEG C, the tensile strength is greater than or equal to 220 MPa, the heat shrinkage rate is less than or equal to 3.5%, and the friction coefficient of the surface of the basement film is less than or equal to 0.55. Compared with the conventional transfer basement film, the PET transfer basement film has excellent shrinkage preventing property. The transfer basement film has excellent heat stability and high tensile strength, and can meet requirements of clients. Transfer films which do not deform at high temperature, are complete in transfer and full and clear in image-texts are produced.

Description

technical field [0001] The invention relates to a PET transfer base film and a preparation method thereof. Background technique [0002] As we all know, transfer film is also called heat transfer film, which is characterized by high tensile strength, good thermal stability, low thermal shrinkage, smooth surface and good peelability. In recent years, the market has a great demand for transfer base film. Usually, the base film produced from PET raw materials is used as the carrier of vacuum aluminizing. After aluminizing by an aluminizing machine, the glue is coated with paper, and then the PET film is peeled off. , The aluminum molecular layer is transferred to the surface of the cardboard through gluing, forming the so-called aluminum-coated cardboard. The cardboard is a kind of cardboard with metallic luster, and it is a high-level novel packaging material developed in recent years. This kind of aluminized cardboard has bright color, strong metallic feeling, and bright and...

AI Technical Summary

Problems solved by technology

At present, the thermal shrinkage rate of the produced PET transfer base film is generally between 0.1% and 0.5%, which cannot fully meet the requirements of users, such as the application of laser transfer film for high-end cigarette packs.

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