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The principle of bubble generation in automatic laminating machine
Nov 13, 2018

We have observed the above bubble phenomenon, we want to eliminate one thing must know the principle of this thing happening. The so-called confidante knows each other and fights. Let's first take a look at the principle of bubble generation in automatic laminating machines:

(A), three major elements of defoaming: time, temperature, pressure.

Temperature heating: can increase the viscosity of the glue, accelerate the fluidity of the glue, increase the degree of moisture

Pressure pressurization: it can accelerate the flow of glue, increase the degree of moisture, and apply pressure to remove bubbles.

Time: can make the glue continue to flow, catalyze the dissolution phenomenon to remove bubbles

(B), the principle of bubble generation

The surface of LCM and TP is not completely flat, no tolerance, plus the difference of ink on the TP, so at the edge of the ink, the residual film at the edge of the TP VA area is inevitable; in addition, in the G+G full fit, A small amount of bubbles will be produced. The three major factors of defoaming, time, temperature and pressure, are mainly to increase the fluidity and moisturization of the glue and generate appropriate extrusion pressure. The catalytic air is dissolved to remove the mass of air, and the air quality will not be eliminated or disappeared. It only spreads to the OCA surface and is integrated into the OCA. Proper defoaming temperature, pressure, time, avoiding the edge of the glue to absorb too much air.

We know that after bonding with a vacuum laminator, the bonding surface is easy to leave bubbles, most of which can be removed by defoaming, but the probability of 20% will leave small bubbles at a single point. We call this small bubble There are two types as follows:

1, poor defoaming

2, Delay Bubble

The small bubbles left after a defoaming are difficult to take off again, because the bubbles shrink and the OCA under the relative area becomes larger, and the wall effect is formed, that is, the pressure cannot be effectively transmitted to the small area of the bubbles, resulting in failure. Once the defoaming is complete, a single point pressure defoaming can be used to solve this problem.