Online-coated ultralow-release force release type polyester film and preparation method thereof

Abstract

The invention provides an online-coated ultralow-release force release type polyester film. The polyester film comprises a silicone coating layer, an upper polyester matte layer, a core layer and a lower polyester matte layer, wherein the upper polyester matte layer is arranged below the silicone coating layer, and the core layer is arranged below the upper polyester matte layer; and the lower polyester matte layer is arranged below the core layer, and the total thickness of the film is 36-40 microns. According to the online-coated ultralow-release force release type polyester film provided bythe invention, the necessary strength and elasticity are provided through the combination of a four-layer structure; and by adding a low release force adjusting agent on the original basis, the release force is reduced, so that the problem that the online coating release force is slightly high is solved, and the problems that partial labels fall and are not separated due to the fluctuation of therelease force of the release film in the high-speed labeling production are solved.

Description

technical field [0001] The invention relates to the field of film technology, in particular to an online coating release polyester film and a preparation method thereof. Background technique [0002] At present, high-speed labeling machines are widely used in packaging and labeling of self-adhesive labels, electronic supervision codes, barcodes, etc. in food, medicine, electronics, daily chemicals, toys and other industries. It is characterized by fast production speed and high production efficiency. Save a lot of labor costs. As a supporting high-speed labeling machine, the polyester-coated silicon-coated release film requires low peeling force, stable peeling force, and small fluctuations in order to adapt to the stringent requirements of high-speed production of the labeling machine. [0003] The traditional release film adopts the off-line coating method, but the off-line coating has the problem of low coating residual adhesion rate, and part of the silicon coating mate...

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Problems solved by technology

[0003] The traditional release film adopts the off-line coating method, but the off-line coating has the problem of low coating residual adhesion rate, and part of the silicon coating material will be detached and adhered to the film printing surface layer in contact with it, affecting the printing ink. Adhesion, resulting in the problem of poor quality of subsequent printing, and the online coated polyester silicon-coated release film can solve this problem, the traditional off-line coated polyester silicon-coated release film has a residual adhesion rate of only 87%, while the online Coated polyester-coated silicon-coated release film has a residual adhesion rate of over 95%. Since there is basically no silicon coating detachment, the label printing quality is good, but online coating has the problem of higher peeling force than offline coating. Meet the requirements of high-speed labeling

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