HOW TO CHOOSE PVB THICKNESS?

Function of PVB film Laminated glass is a product made by placing one or more layers of polyvinyl butyral film (referred to as PVB film) between two or more pieces of glass through high temperature and high pressure processing. PVB film has the characteristics of good weather resistance, strong elasticity, and firm bonding with glass. After being processed into laminated glass, the glass has good impact resistance and penetration resistance. After the glass is broken, the fragments still adhere to the film and remain intact. characteristic. The thickness of the PVB film in the middle layer has a buffering effect on the impact force. The thicker the middle layer is, the greater the buffering effect is, which is more conducive to reducing the destructive force of the impact object on the laminated glass and improving the impact resistance of the laminated glass. The thickness of the middle layer is doubled, and the impact resistance can be improved by 2 to 3 times. The thicker the PVB film is, the better it is to fill the gaps caused by the poor fit between the glass, to ensure the adhesion between the glass and the film, to avoid air bubbles and degumming, to improve the yield of production, and to ensure that the glass can avoid deformation and rebound after installation and use. Bubbles and degumming occur due to external factors such as changes in cold and heat, prolonging the service life of the glass. The thickness of PVB film is closely related to the quality of laminated glass.

The difference in the thickness of a single piece of floor laminated glass should not be greater than 3mm, and the thickness of the interlayer film should not be less than 0.76mm. The "Technical Specifications for Architectural Glass Applications" ft specifies the film thickness requirements based on the use of glass to ensure that the use requirements for specific purposes are met, and to prevent damage and fall due to the impact resistance of PVB films that are too thin after glass breakage. This specification does not make special requirements on the film thickness of conventional products, but stipulates the maximum allowable area of safety glass in clause 7.1, which limits the use of thinner PVB film for glass with different thicknesses and infinite panels to a certain extent. In order to meet the sufficient adhesion between glass and film, it is generally required that the thickness of PVB film with ordinary laminated glass below 6mm is not less than 0.38mm, and the thickness of PVB film with glass above 8mm is not less than 0.76mm; The thickness of PVB film with tempered laminated glass below 6mm is not less than 0.76, and the thickness of PVB film with tempered glass above 8mm is not less than 1.14mm. In the case of larger boards, the thickness of the film should be increased considering the processing capacity and safety of use. To ensure that the corresponding thickness of the glass and the thickness of the film match, one is to ensure sufficient adhesion between the glass and the film to ensure the safety of the glass bonding; the other is to avoid bubbles and degumming of the glass during production to ensure the yield; three. It is to reduce the bubbles and degumming caused by the rebound of the glass itself during the use of the glass, so as to ensure that the glass meets the expected use requirements.

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