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GAMA玻璃PVB準備程序

合片前的準備:伸展與裁切 Preparation: Stretch and Cutting

1.伸展 Stretch

中間膜需按擋風玻璃的形狀, 做伸展加工, 一般是加熱中間膜使其成為扇形。 而為了避免殘存應力,使中間膜伸展 後 有 縮 回 現 象 , 建 議 中 間 膜 應 在25℃以下貯存。若是平板玻璃則不需伸展加工。
PVB film is stretched and heated to become fan-shaped to accord with windshield glass. To prevent the residual stress causing contraction after stretch process, PVB film should be stored up below 25C. If laminating with flat glass, stretch process is not needed.

2.裁切 Cutting

考慮中間膜在夾層程序時的收縮率, 裁切後中間膜之尺寸應略比玻璃大。
Take the contraction of PVB film into account , the size after cutting should be slightly larger than glass.

3.含水率控制 Moisture Control

中間膜含水率對夾層玻璃的接著及耐貫穿性有決定性的影響。為了得到適宜的接著及好的耐貫穿阻力,中間膜含水率的控制是必須的,一般含水率範圍0.3~0.6wt% 。但含水率易受外在環境影響,而偏離此範圍。當中間膜貯存在2 0 相對濕度23% 的條件之下,其平衡含水率約0.4%。
The moisture content of PVB film is key factor for adhesion and penetration resistance of laminated glass. The moisture content should be controlled in the range from 0.3 to 0.6wt%. However, it varies with environmental Condition easily. When PVB film is stored at 20 ℃ and RH 23 %,the equilibrium moisture content should be around 0.4%.


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