Protective film of photosensitive dry film

Abstract

The invention relates to a protective film of a photosensitive dry film. The protective film includes a film body, and the film body comprises a matt layer with a matt surface and a glossy layer with a glossy surface. The glossy layer has roughness Ra of 0-0.15 micrometer, surface energy of 0-25 dyne / cm, and a release force of 0-2000g; the matt layer has roughness Ra of greater than micrometer, surface energy of greater than 0-25 dyne / cm, and a release force of greater than 0-2000g. The film body also includes at least one intermediate layer, and the intermediate layer is disposed between the matt layer and the glossy layer to connect the matt layer and the glossy layer. According to the invention, through improvement of the existing technology, the film body has the matt surface and the glossy surface, wherein the glossy surface is compounded with a photosensitive layer, moderate release force ensures that the protective film and the photosensitive layer are attached together, and also guarantees that the protective film is easily separated at a film press link. The matt layer provides appropriate friction force, prevents untidy roll-up caused by interlayer slipping and offset of the dry film layer during roll-up and transportation, and enhances the product quality.

Description

technical field [0001] The invention relates to a protective film, in particular to a protective film attached to a photosensitive dry film. Background technique [0002] With the improvement of people's health awareness, more and more attention is paid to the requirements of the working environment. As we all know, in the production process of printed circuit boards, a photosensitive dry film is used to form a circuit pattern, and the photosensitive dry film includes a supporting base film, a photosensitive resin and a protective film. The protective film is used as a protective layer for the photosensitive dry film to protect the photosensitive dry film. The protective film is usually torn off before laminating to ensure the normal production of the circuit board. The current protective film of photosensitive dry film is usually PE protective film or PP protective film, that is, a protective film completely made of PE material or a protective film completely made of PP ma...

AI Technical Summary

Problems solved by technology

[0003] PE protective film: 1), it is relatively soft, and when it is attached to the photosensitive layer of the photosensitive dry film and wound in the equipment, it is prone to the problem of bamboo-shaped ring-shaped protrusions

2) Insufficient rigidity, because there is a tendency to shrink after stretching, it is easy to cause the photosensitive layer to be squeezed and flow glue; and the memory stretch of the protective film leads to loosening after winding, and the protective film and the photosensitive layer are prone to appear during subsequent transportation and use. Dry film misalignment problem

3) Insufficient tensile strength, especially when the internal temperature of the laminator is higher than 40 degrees, the photosensitive dry film travels on the laminator that relies on the protective film to pull, and the PE protective film becomes longer due to heat stretching, resulting in the photosensitive dry film. Synchronous travel, resulting in lamination failure

4) Insufficient rigidity, prone to oblique wrinkles in the lamination, slitting and laminating stages

6) The manufacturing method adopts the blown film process, and the production efficiency is low

Due to the inherent defects of PP protective film being gradually eliminated by the market, the use of PE material to make protective film has become the mainstream, but PE protective film can only be produced by blown film process, the width and speed of production are limited, and the efficiency is low

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