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Dry Compound, Bond Stretch Well How To Deal With?
Nov 25, 2016

Dry compound, bond stretch well how to deal with?

A: adhesive variety, quality and composite substrate does not fit. Must consist of base materials and complexes of the end use to select the appropriate adhesive. For example, when there is no participation of aluminum foil compound, optional universal adhesive if the aluminum foil and end use packaging containing liquid, hot and sour foods such as mustard, pickled cabbage, fruit juice and other foods, on the usage of hot and sour special adhesive for aluminum foil. Another example: composite bags require high temperature steam sterilization is used high steam-resistant adhesives, and also to distinguish between adaptive foil heat-resistant adhesive and adapt to high temperature resistant adhesive for plastic only, can't use the adhesive in General.

B: composite steel rollers surface when the temperature is too low, resulting in poor adhesive activation, when the viscosity of high infiltration of a second substrate is not good and bad adhesion, resulting in two not very good contact between substrate and affect bond stretch. This will normally process requirements, composite steel roll surface temperature was maintained at 75~85du.

C: insufficient amount of glue. Over the pursuit of lower costs, too little amount of glue, often lose, resulting in defective junk. The causes of insufficient amount of glue, in addition to the dot density and adhesive note concentration factors, mostly related to net roller cleaning NET, dot plug. Because every time you wipe with solvent cleaning, Kai, is a dot inside the remaining glue cannot be thoroughly washed. A small amount of adhesive to curing that is not washed, accumulating more points gradually to shallow depths, result in reduced amount of glue, for which efficient washing liquid for cleaning has been blocked on cots.

D: poor adhesive penetration of network roll, float on the surface of ink, ink fastness with the substrate is not good, stripping when ink is pulled down by adhesive, in place of ink, especially color, ink is thick bond stretch of bad ink transfer. You should choose low-viscosity adhesives and overestimate their content, slow drying, allow time for glue to penetrate and reach the surface of the substrate, as well as to appropriate the amount of glue. Of course, the appropriate ink, improve the substrate's surface tension, adhesion of printing inks fastnesses is one way to solve the problem.

E: bad films Corona treated, surface tension is less than 38mN/m, resulted in printing and composite bond stretch is good. Should carefully test substrate surface tension must be increased to 38mN/m per cent.

F: residual solvents is too high, after the evaporation caused many tiny bubbles, make two kinds of substrate layer detachment. Can increase the oven temperature or slow the speed of complex operation, you can also avoid using high boiling solvent.

G: composite good, curing is not complete, has not yet reached the viscosity of the final stretch. One is aging low and the other is the curing time is too short. In General, when the composite should be cured as soon as possible to the 50~60du environment for more than 48 hours. Composite is completed as soon as possible into the curing Chamber is also important, if more than 10 hours before you put them into ripening, the effect will be very large.

H: purity of the diluent is not high, contain active substances such as water, alcohol, consumed part of the stabilizer, adhesive main agent and curing agent caused the actual percentage of inadequate bonding force decreases. So when the solvent, pay strict attention to quality, strict prevention water immersion.