软包装无溶剂复合工艺及牢度规律研究

目的 研究软包装无溶剂复合膜制品的生产条件，通过剥离强度分析复合牢度规律，从而优化生产工艺、提高产品质量。方法 通过控制无溶剂复合过程中工艺条件，分别制备干轻包装BOPP/CPP组合、水煮包装PET/PE组合、蒸煮包装BOPA/RCPP组合无溶剂复合膜，研究胶黏剂涂布量与复合速度对样品剥离强度的影响规律。结果 在实验条件范围内，所制备无溶剂复合膜样品的剥离强度随涂布量的增加而逐渐增大，分别在涂布量为1.0、1.2和1.6 g/m²时，剥离强度能够达到国标要求；而复合速度对强度的影响较小，复合速度为450 m/min时的剥离强度与复合速度为100 m/min时的剥离强度相比，降低率在20%以内，远低于涂布量的影响。耐热性与耐高温介质性实验结果说明，通过回归计算，水煮包装PET/PE组合与蒸煮包装BOPA/RCPP组合分别在涂布量达到1.19 g/m²和1.73 g/m²后，高温加热能够进一步促进胶黏剂固化反应，从而使剥离强度反高于水煮或蒸煮之前。结论 针对上述3种复合软包装类型，无溶剂复合工艺能够在一定涂布量与复合速度范围...

Solventless Laminating Technology and Fastness Laws of Flexible Packaging

The work aims to study the production conditions of solventless laminating film used for flexible packaging and analyze the fastness laws by peeling strength, so as to optimize the production process and improve the product quality. By controlling the technological conditions of solventless laminating process, different types of solventless laminating films were prepared separately (dry and light packaging BOPP/CPP combination, boiled packaging PET/PE combination and retorted packaging BOPA/RCPP combination) and the effect of adhesive coating weight and laminating speed on the peeling strength of films was analyzed. Under the experimental conditions, the peeling strength of solventless laminating film samples gradually enhanced as the coating weight increased and met Chinese national standard requirements when the coating weight was 1.0 g/m2, 1.2 g/m2 or 1.6 g/m2. The effect of laminating speed was considerably less noticeable compared to that of the coating weight. The peeling strength at a laminating speed of 450 m/min was only 20% less than that at 100 m/min. Regression analysis on results obtained from tests of heat resistance and high-temperature resistance indicated that heating at high temperature facilitated the curing reaction of adhesive when the coating weight reached 1.19 g/m2 or 1.73 g/m2, resulting in greater peeling strength compared to that before boiling or retorting. In conclusion, with respect to the aforementioned types of laminating flexible packaging, solventless laminating products can meet the Chinese national standards on product strength when coating weight and laminating speed are set within a specific range. Altogether with the lower consumption of energy and less emission of pollutants, solventless laminating becomes a highly viable and much more environmentally friendly substitute for dry laminating process.