Foam

Abstract

Foam comprises a release film, back gum, foam gum, a protective film and a window protective film. The back gum is arranged on the front face of the release film; the foam gum is arranged between the back gum and the protective film; and a gap is formed in the surface of the protective film. When the foam and a complete machine shell are assembled, the protective film is torn from a top corner, external force F generated by tearing can be decomposed into force F1 and force F2 in the directions parallel to the two edges of the top corner correspondingly, as the gap is formed in the surface of the protective film, part of the force F1 perpendicularly acting in the length direction of the foam gum is released through the gap, part of the force F2 perpendicularly acting in the width direction of the foam gum is released through the gap, and the risk of foam layering can be effectively lowered. Because of the existence of the window protecting film, even though the gap is formed in the surface of the protective film, dust can be effectively prevented from entering, and the protective effect on a touch screen window is still ensured.

Description

technical field [0001] The invention relates to the technical field of touch screen auxiliary materials, in particular to foam. Background technique [0002] With the development of technology, touch screens, as a convenient and quick way of man-machine interaction, are more and more applied to handheld terminals, such as mobile phones, PDAs, and tablet computers. At present, in the production and application of handheld terminals such as mobile phones, most of them use the frame sticker method. In the frame-mounting method, foam is needed, which is usually located between the touch screen of the mobile phone and the casing of the mobile phone to play a supporting and buffering role. Therefore, foam is an important component in the frame-mounting method. [0003] Traditional foam usually includes upper protective film, window protective film, foam glue, back glue and lower release film. When it is applied to the touch screen, the lower release film is first torn off and the...

AI Technical Summary

Problems solved by technology

However, when tearing from the top corner of the upper protective film, the edge of the foam is subjected to vertical force, and the force perpendicular to the length direction of the narrow side of the product is likely to cause delamination of the foam, which in turn damages the use of the entire touch screen. Carry out reverse work operations, resulting in human and financial losses

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