Steel strip for manufacturing flexible circuit board and method for manufacturing the same

Abstract

The invention discloses a steel band of a steel sheet for manufacturing a flexible printed circuit board and a method for manufacturing the steel band, wherein a viscose glue layer is directly sprayed onto the surface of the steel band with broad width. The manufacturing cost of the steel band is reduced, in a using process of a flexible printed circuit board factory, the utilization rate of the steel band is improved, and capital investment of the factory to equipment required by cutting the steel band is effectively reduced. The method comprises the following steps of coating the naked broad-width steel band with at least 52cm of width and 0.05 to 0.5mm of thickness with an adhesive layer by a spraying technology, and after the adhesive layer is dried by air and cured, sticking a releasing layer on the outer surface of the adhesive layer. As before the steel band is provided to the flexible printed circuit board factory, the naked steel band is coated with the adhesive layer, the investment of the flexible printed circuit board factory to equipment is greatly reduced, the utilization rate of the steel band can also be effectively improved, meanwhile, production links are reduced, the production efficiency is improved, and the reinforced steel sheet with stable size and very strong adhesion strength between the adhesive layer and the steel band can also be obtained.

Description

technical field [0001] The invention relates to an accessory used for a flexible circuit board, in particular to a steel strip for manufacturing a reinforced steel sheet for improving the local bearing capacity of the flexible circuit board. Background technique [0002] The biggest advantage of flexible circuit boards is that they are flexible and can be bent, wound and folded freely. They can be arranged arbitrarily according to the requirements of space layout, and can be moved and stretched in three-dimensional space, so as to achieve the integration of component assembly and wire connection; However, there are deficiencies in the bearing capacity of components. Therefore, in order to improve the rigidity of the flexible circuit board where the mounted connector or IC chip is located, usually, the back of the connector or IC chip is hot-pressed to enhance the position. The reinforcing steel sheet for the load-carrying capacity of the flexible circuit board is fixed on th...

AI Technical Summary

Problems solved by technology

[0005] 1) A large amount of steel strip waste will be generated when each roll of steel strip is attached to the film strip or the conductive film strip

[0006] In the process of pressing and rolling several lengths of film strips or conductive film strips and steel bars, when the tension of the winding equipment is not adjusted to the best state, the film strips or conductive film strips in some sections are due to Deviation will cause misalignment with the steel strip in the width direction. If the width of the film strip or conductive film strip is cut to be the same as the width of the steel strip, then the misplaced section of the film strip or conductive film strip will be Dangling waste

Usually, the price of the film strip or conductive film strip is much more expensive than the price of the steel strip. Therefore, when designing the width of the two, the width of the steel strip is cut slightly wider than the film strip or the conductive film strip. (that is, a certain width margin must be reserved on both sides of each steel bar), so as to ensure that the adhesive film strip or conductive adhesive film strip will not hang in the air. After hot pressing, it is cut into the final reinforced steel sheet At the same time, the excess steel sheet is partially cut off, resulting in a lot of waste of steel

[0007] 2) For manufacturers of flexible circuit boards, the hot pressing of adhesive film strips or conductive adhesive film strips and steel bars is an auxiliary process. In order to reduce equipment investment, manufacturers are usually reluctant to invest too much in laminating hot pressing equipment Therefore, it is a non-assembly line operation, that is, there are many factors of manual work, which can easily lead to high scrap rate and low production efficiency, and it is difficult to guarantee product quality

Therefore, in order to ensure quality, enterprises must invest a large cost to purchase more expensive and better-performing presses.

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