Composite membrane, the phenomenon of the peel strength and low, don't know what time it is late!

Composite membrane, the phenomenon of the peel strength is low, caused by many factors, need to screen clearly. Here are some leading to the main factors of complex film peel strength problem. ( 1) The type selection of adhesive should be based on the composite film USES different kinds to choose the appropriate adhesive. Such as compound bag need after high temperature cooking ( 121 ℃ or 135 ℃) Sterilization, should choose high-temperature cooking glue adhesion agent; Need to install some spicy food or pesticide packaging, you need to choose special or pesticide resistance to medium adhesives special glue adhesion agent. In addition, because the market of adhesive production factory technical force is uneven, the quality of the products, the stability is also different, so in the choice of adhesive model, first of all, should choose to have certain technical strength of the manufacturer of the product. ( 2) Adhesive coating uniformity and solvent-free film adhesive glue amount and enough glue or uneven coating will cause all or partial product peel strength decreased. In general the gluing quantity in 1 transparent composite products. 2 g / ㎡, boiled the gluing quantity in 1 of the products. 4 g / ㎡, high-temperature cooking coating or plating aluminum composite generally in 1. More than 6 g / ㎡, when the glue quantity is less than the required experience value will affect the quality of the product, the specific amount of glue products, of course, also need to according to the actual situation of each manufacturer is slightly different. ( 3) With glue and mixing uniformity mainly for bi-component solvent free film adhesive products, when the solvent-free fumo plastic distribution of two groups of plastic ratio or mixed uneven will affect the peel strength of final product, serious sticky phenomenon occurs. ( 4) When the surface tension of the composite matrix composite substrate surface tension is lower than the required value, will seriously affect the product the peel strength after the compound, general film after corona treatment should be used as soon as possible, as the extension of time, the processed film surface tension will decrease gradually. Advised with dyne pen before starting the inspection for the surface tension of the composite materials is qualified. ( 5) Curing degree without solvent adhesive with low molecular weight of the solventless adhesives, basic no initial adhesion force; After compound need in 40 ~ 50 & deg; C crosslinking curing aging chamber for further. When curing temperature was low, short curing time or low temperature storage time is too long will affect the product's final peel strength, some reposition the cure also has no obvious effect, this part mainly isocyanate component has the reaction with water vapor. ( 6) The influence of other factors such as plastic film base material additives in additives ( Such as slip agent) Migrate to the surface of the composite material of isocyanate component with adhesives reaction, reduce product final peel strength; Can decrease the curing temperature to reduce the migration of additives in the plastic film. In addition, ink solvent residual too much ( Especially the use of alcohol solvent) Match with ink, adhesives and the composite stress factors also can affect the final product peel strength.