Roller and guide roller for printing the influence of the composite membrane

Composite roller, guide roller and roller plays an important role in the composite film printing, roller inequality will cause the glue spots, guide roller, the composite roll imbalance caused by composite membrane wrinkling. 1, the composite film peel strength is not enough in the following situations: glue curing incomplete, separating them when in the glue water and viscosity. Reasons: 1) An insufficient adhesive proportion of errors, the proportion of curing agent curing incomplete. In the preparation of adhesive to as stipulated in the adhesive manufacturers matching parameters configuration; 2) Of solvent purity is not enough, is contained in water or alcohol solvent paint, water or alcohol reacts with the glue of curing agent and reducing the proportion of curing agent, leading to incomplete glue solidification. Used in dry compound solvent is ethyl ester, ethyl so when into the factory every batch of sampling, cannot be used when purity found enough; 3) Printing ink residue solvent in the membrane of high cause of glue solidification was not enough. Ink ( Especially the PET ink) Part of residual solvents have will react with curing agent of glue, which consumes curing agent in curing glue is not enough. Countermeasures: (1) thin film is best not to immediately after printing compound, if time permits can be placed first 1 & ndash; After 2 days and then to compound; (2) the printing film off the plane after testing residual solvents, such as high residual solvents, in the composite can be appropriately increase the proportion of curing agent; Choose a fast curing glue. 4) Composite membrane low curing temperature, curing time is not enough, appear inadequate crosslinking, curing incomplete. Countermeasures: improve the curing temperature or with fast curing glue. 2, the apparent problem 1) that the composite film Ink dots. 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 connect the layer formation, is likely to happen. 2) Gray points. Appear gray point there are two possibilities, one is roll caused by uneven glue spots, 2 it is caused by the uneven ink printing ink without compacting spots. Two possibilities are associated and process can be solved by adjusting the process, improve the thickness of the gluing quantity. 3) White dots. Generally prone to ink discoloration on the surface of the case. Appeared in the composite aluminum plating film. For two reasons: one is the ink color covering power is not strong or cover uneven, especially white ink, make the color of aluminum 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. 4) 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, it is also possible because no clean machine. 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. 5) A small scar. Is mainly due to the uneven film activation treatment of membrane, also appeared in the process of printing the same scar, of course, may be because the activation time is too long. 6) Wavy lines. 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. 7) The influence of film on the surface quality. Because of the thin film surface is smooth, uniform degree of a variety of reasons, 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 very small spots on the film, wave amplification, many situations to look carefully to find problems. 3, composite film composite tunnel phenomenon due to the shrinkage film, edges or central part like earthworms shape layer, called composite film tunnel. Appear this kind of phenomenon the reason mainly has the following several aspects: 1) From bad tension control in the process of composite in composite matrix and contraction after composite proportion is large, the damaged composite film adhesive glue layer, produce tunneling solution is in the compound should be set according to the tensile properties of different composite matrix suitable tension. 2) Membrane wrinkling, uneven thickness, when in a composite in order not to make the composite membrane wrinkling, increase the tension of composite leading to composite film tunnel. Solution is to check when composite film in a roll of the state, such as membrane wrinkling, shaking the phenomenon such as do not use.