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In terms of quality control elements, there are many differences between solvent-free composite and dry composite (see table below)
Difference of control points between solvent free and dry composite process

Items or indicators	Solventless compounding	Dry lamination
Glue amount	0.8～2.0g/m2 Paper plastic composite： 1.0～3.0 g/m2	Dry glue1.2～5 g/m2
curing temperature	40～45℃，Depending on composite substrate	45～55℃
Curing time	24～48hour，Depending on the composite substrate and subsequent process	24～48hour
Compound pressure	less	more
Belt tension	Less impact on quality	Less impact on quality
drying temperature	No need to dryMulti stage independent temperature control	，65～95℃
Coating roller temperature	45～55℃	normal atmospheric temperature
Compound roller temperature	45～55℃	55～85℃
Cooling roller	Only one component adhesive needs to be cooled	Independent cooling cycle
Winding uniformity	When the amount of glue is too large, the winding is not neat	It has nothing to do with the amount of glue

In practice, solventless compounding usually emphasizes the following factors:
Tension control. Due to the low initial viscosity of solvent-free composite, the matching of tape tension is required to be higher. Note: many people think that solvent-free lamination requires a higher tension system, which is not accurate. In fact, it is a higher control of the tensile rate of the two-layer composite tape. Under the current control technology conditions, the control accuracy of tension system can easily meet the requirements of solvent-free composite, but the matching requirement of tensile property is higher than that of dry lamination.
Glue amount. Because the amount of solvent-free composite coating is usually only 1 / 2-1 / 3 of that of dry composite, and the size of coating may also affect the composite quality and winding uniformity, therefore, the control requirements of coating amount are usually more strict.
Curing conditions. Because the curing conditions may affect the composite fastness, the transfer of aluminum coating, the friction coefficient of heat sealing layer, etc., and it is often ignored in practical operation, so it is more important for the quality of solvent-free composite than for dry composite.
Dongguan Beite packaging materials Co., Ltd. - located in Dongguan City, the world's manufacturing city, is a subsidiary of Beite packaging (China) Co., Ltd., with a plant area of 6000 square meters. It is a flexible packaging enterprise integrating R & D, production and sales. It has a complete set of domestic advanced production equipment, a scientific and humanized management system and a group of experienced technical personnel For backing, to provide customers with quality products and first-class service.
The company produces composite bags, roll film, fruit bags, aluminum foil bags, suction mouth bags, self-supporting bags, zipper bags, anti-static bags, special-shaped bags, etc., which are suitable for the internal and external packaging of food, daily chemicals, electronics, toys, medicine, cosmetics, industrial products and other industries.
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