OCA optical adhesive is mainly used for material bonding on touch screens. So what are the causes of common problems such as overflowing glue bubbles in the OCA optical adhesive process? Let's analyze it together.
In general, the common problems of OCA optical adhesive process include light leakage, creases, indentations, glue overflow, white spots, foreign bodies, pinholes, depressions, bubbles, glue wrinkles, scratches, etc., let's talk about the causes of these problems and how to solve them.
1. Light leakage problem, light leakage is generally a problem caused when the product is shipped to the customer for fitting.
Solution:
(1) The customer's own design size is the lower limit plus the lower limit of the production size, resulting in a small mold size design, and the customer should be communicated in advance to understand the actual size of the customer's product.
(2) If there is a deviation between the measurement size of the company and the customer, the size difference between the two sides can be compared to make a unified size standard.
(3) Finally, the temperature of the processing environment, storage environment and transportation environment can be controlled, and the problems of shrinkage can be controlled.
2. Creases, indentations, glue wrinkles, scratches and other problems
Solution:
(1) If the core is too small and causes wrinkles and other defects in the parts close to the core, you can use a large core instead.
(2) If the raw material is placed on the pallet, the self-weight of the raw material will indentate the material, and the fixture will be used to suspend the material.
(3) The knife mold is not sharp enough or the foam is not suitable to cause indentation, and the knife adopts a high-quality mirror knife (imported from Japan) wooden knife mold. The thickness of the planks is required to be 21 - 22mm, which is 2 mm thicker than the average. The foam is made of low-density and high-elasticity pad knife foam. Generally, the density is 45° and the elasticity is 70%.
(4) When the raw material is slitting, the surface of the material is scratched and indented, and the raw material needs to be effectively protected by a light release film to avoid surface scarring. In addition, when slitting, pay attention to the material tension to minimize the phenomenon of glue wrinkling.
(5) Problems caused by die-cutting, reduce the pressure of compounding, die-cutting and material to avoid direct contact with metal or other fixed non-rotating animal products, and increase protection devices.
3. Glue overflow
Solution:
(1) The knife mold is not sharp enough or the foam is not suitable to cause indentation, and the knife adopts a high-quality mirror knife (imported from Japan) wooden knife mold. The thickness of the planks is required to be 21 - 22mm, which is 2 mm thicker than the average. The foam is made of low-density and high-elasticity pad knife foam. Generally, the density is 45° and the elasticity is 70%.
(2) Glue the mold, inject release agent into the knife and the side of the foam to prevent the mold from sticking.
(3) Waste discharge causes glue overflow, change the waste discharge angle, speed up die-cutting, and reduce downtime.
(4) Manual packaging causes poor extrusion, strengthen the proficiency of the technique and correct the wrong technique.
4. White spots and foreign bodies
Solution:
(1) In die-cutting, the material generates static electricity during operation, which will absorb dust and foreign matter in the air, and an ionizer is added to the exposed position of the glue, and there is a filter behind the ionizing fan;
(2) Influence of environmental factors, reduce the frequency of workers walking in front of the machine, and increase or replace FFU (high-efficiency filter) in the clean room.
5. Pinholes and depressions
Solution:
(1) Caused by dust and foreign matter during processing, an ionizing fan is added to the exposed position of the glue, and there is a filter behind the ionizing fan, and a dust-free baffle is added to the exposed position of the glue for isolation protection.
(2) There are dust and foreign substances adsorbed on the laminating wheel, which causes the light release film to be dented when laminating and changing the light release film, and affects the product colloid at the same time, and the ionization fan is added, and the cleaning frequency of the laminating roller is increased.
(3) If the product is indented due to excessive force, pay attention to handling it gently when packing.
6. Bubble problem
Solution:
(1) Peel off the low mucosity film at the bottom during packaging to cause bubbles, and strengthen the accuracy and proficiency of the technique of peeling off the low mucous film.
(2) If there are bubbles in the raw materials, feedback to the supplier and ask for improvement.
(3) Die-cutting produces bubbles, and the cushion knife foam is made of low-density and high-elasticity cushion knife foam, generally using a density of 45 degrees and an elastic force of 70%.
(4) If bubbles are found in die-cutting, use a high-pressure degassing machine to degasses.
End: The common problems of OCA optical adhesive process in the die-cutting process are analyzed here, if there are errors or omissions, please leave a message to supplement ~ more about die-cutting related knowledge to exchange and learn together.
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