Questions about dry type composite membrane surface quality

1. The surface of the composite film quality issue form is varied, the cause of formation are also different, we think about the surface of the composite film quality identification standard should have the following three points: a, after double membrane to keep printing ink color as much as possible. Due to the effect of aluminium coated membrane have different degrees of change color mostly, this depends on how to get as close as possible to color, good ink and glue plays a role of the respective cover should be. B, look at the surface of the degree of light are both the ink, and glue, attention should be paid to identify; C, if there is a small point. 2. The forms and reasons of surface quality problem analysis, a little ink. Immediately after general membrane appear less likely, unless it is muddy impurities such as slag. Membrane after a period of aluminum plating film could appear this kind of phenomenon, the reason is because ink on corrosion of aluminum, when the ink to present certain acidic or alkaline, and the gluing quantity is small, can't form a continuous layer, is likely to happen. B, gray points ( The small firm point) 。 Appear gray point there are two possibilities, one is the roller caused by uneven glue spots, the other is caused by the uneven ink printing ink without compacting spots. Two possibilities and process is concerned, can be solved by adjusting the process, which increase the thickness of the gluing quantity. C, white dots. Under the condition of general surface printing ink color easy to appear. Appeared in the composite aluminum plating film. Appear white dots for two reasons: one is the ink color covering power is not strong or cover uneven, especially white ink, the color of the aluminium infiltration, not aluminum color penetration of this white dots; Secondly, the process, drying temperature ( Especially the primary drying tunnel) Too high or the gluing quantity is too thick, leading to the surface of the rubber is within the primary drying tunnel, ethyl ester in the secondary and tertiary bake dishes, coming out of the crowded up the glue, ink color. The solution is to improve the ink covering power, or the first, second and tertiary bake, adjust the suitable temperature, heating up step by step. Avoid level temperature is too high. D, small crystal points. Small crystal point occurred in more transparent membrane, which has two kinds of concave and convex, causes different: stick out most of the small crystal point is with glue, if not in the correct order (with glue To add thinner, first add curing agent) First, curing agent, diluent, usually after 10 hours will appear small crystal point, but there are also may be because the machine use for a long time, but I did not clean. Elimination of small crystal point must be in strict accordance with the correct match gum method with glue, the machine must be cleaned after use; Small dents crystal point, use a magnifying glass look carefully, you will find there are small bubbles, this is mainly because too much water, to pay attention to the moisture content of diluent should not exceed 0. 2%, half a bucket of curing agent must not use up cover, to avoid moisture to enter. E, small scar. Small scar is smaller than the above points, around the middle convex concave point, is mainly due to the membrane of non-uniform membrane activation treatment, also appeared in the process of printing the same scar, of course, may be because the activation time is too long. F, wavy grain. Wavy lines easy to occur on the white film, mainly because the adhesive molecular weight is not neat, after baking hot, hot roller, shrinkage, elastic polymer chain molecules of different molecular weight in contraction, this caused by uneven contraction in wavy lines. The reasons for this kind of circumstance should consider to glue. G, the influence of the film on the surface quality. Because of the thin film surface is smooth, even degree, may be the cause of the above six phenomenon similar phenomenon. Difference is the cause of the film or the above six kinds of circumstances, can be no fumo film with a magnifying glass observation carefully, because of the transparent glue between the two layers of film, together with two layers of film forming composite membrane, use a magnifying glass, will originally small spots on the film, such as wave amplification, many situations to look carefully to find problems.