1. Surface tension test
The surface tension test of the film is very necessary. For polar materials such as PET or BOPA, the film surface itself has a high surface tension, so even without corona treatment, it can achieve better composite strength, but such as the BOPP film itself. It is a non-polar material, and the surface tension cannot meet the requirements of compounding, so the compound surface must be corona treated.
In addition, the surface tension will gradually decay with the change of time and environment. Therefore, the surface tension must be checked before use for non-polar materials, especially when using materials with long storage time.
2. Reasonably control the glue setting
The control of the sizing amount is more important in the composite process. Generally speaking, the sizing amount in the actual production process is generally controlled on the index of the lower value of the theoretical requirement due to the production cost. Unchanged, it needs to be adjusted according to the film type and thickness. Generally, the general composite material is controlled at 2.0g / m2 ～ 2.5g / m2. For thin aluminum composite products, the amount of glue should be controlled above 3.5g / m2. For heat sealing For materials with a layer thickness of more than 60μ, especially when the amount of opening slip agent is high, it is necessary to appropriately increase the amount of sizing, which is usually controlled at 3.0g / m2.
In addition, for the materials that need to be cooked, since the peel strength is required to be 5N / 15mm or more, the amount of glue needs to be controlled at 4.5g / m2. the above.
3. Choose a stable supplier
Whether it is a film substrate, ink, or adhesive, some well-known domestic and foreign suppliers should be selected, because these manufacturers have advanced production equipment, testing equipment, stable production technology and strong technical support, and the product quality is relatively partial Smaller manufacturers are more reliable.
4. Compound process control of aluminized products
(1) Control the amount of glue
Under the premise of ensuring the composite appearance effect, the amount of sizing should not be too high, generally controlled between 2.0g / m2 ~ 2.5g / m2, because too high coating amount will cause the composite film to become hard and make the aluminum coating layer occur Transfer.
(2) Select special aluminum-plated composite adhesive
Adhesive manufacturers have specially developed specific adhesives for the characteristics of aluminized films. These adhesives have a small molecular weight and can produce a high level between the aluminized layer and the film through the pinholes in the aluminized layer The binding force.
5. Control the curing temperature and time
Due to the shrinkage of the inner layer material and the destruction of the aluminum coating layer, the curing temperature is lower than that of the general products when the curing process is formulated. The curing time needs to be strictly controlled. The general curing temperature is controlled at about 40 ℃, and the curing time is controlled at At 36 hours, when the ambient temperature is high, ripening at room temperature can be considered.
6. Control the amount of curing agent
Under the premise of sufficient testing, the proportion of glue curing agent can be appropriately reduced, generally 5% less, but this method is not recommended for films printed with full-page polyurethane ink. The hydroxyl group in the ink will consume the curing agent, so it will produce If the glue does not solidify, it will produce uneven end faces or glue extrusion after slitting, which will seriously affect the quality of the product.
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