How the compounding of the pre-coating film creates favorable conditions for the following processes (including indentation, bronzing, and wireless binding on the cover, etc.) is also one of the important factors worth considering in the process of using the pre-coating film for the laminating operation.
When the pre-coated film is combined with the paper print, the lower limit is 80 ° C and the upper limit is 100 ° C. Intuitively based on the high brightness, no fogging, good flatness and no blistering after the composite body is detached from the hot-pressing roller, in this temperature range, the hot melt adhesive can fully receive the heat from the outside to the deep inside Function, the modification of the various raw materials in the colloid can be fully exerted, and the entire adhesive layer is completely melted, resulting in a true and strong bond, rather than the surface, shallow layer, and must not be bent or The phenomenon of shelling and blistering after reheating.
When the lower limit temperature is slightly downward, the brightness of the composite product will decrease. When the upper limit temperature rises slightly, bubbles that are not smooth and have different shapes will be scalded on the surface of the film. (This phenomenon is particularly obvious in the electronic laminating machine) It is just right to control the critical working area of ​​the coating temperature, which not only has a good composite effect, but also makes the hot-melt colloid close to the hot spot of the cross-linking reaction. The curing of the colloid is almost hard, so that when it recurs When heated, it will not soften easily. The correct temperature control method for coating operation is to precisely grasp the coating temperature which is very close to the crosslinking reaction temperature.
When using a pre-coated film to cover the cover and then bind it for wireless binding, it is found that most of the bound binding skins that have been divided after winding up have spine detachment and blistering, which leaves the cover film. After the heat source, the method of water cooling and immediate automatic segmentation do not have this phenomenon. (If the equipment is equipped with water cooling system, automatic segmentation system and winding system for selection) The curing time of the hot melt adhesive for laminating is about 10-15s, and the time required for natural cooling at normal temperature in the production environment is greater than this standard Time, especially if the semi-finished products are stacked and wound before being divided, the temperature accumulation between them is difficult to radiate, so that natural cooling and solidification is prolonged. Usually the natural temperature is slowly reduced and solidified, which will gradually form crystals in the hot melt adhesive.
The formation of crystals improves the sensitivity of the colloid to temperature, which may cause the hot melt adhesive to soften again, weakening the high temperature coating operation to make it approximate the heat resistance function of the cross-linking reaction. Therefore, we use water cooling and immediate automatic segmentation to prevent heat accumulation, and create a low-temperature quenching and curing zone for the coated product immediately after leaving the heat source, allowing it to quickly cool down, so that the viscosity of the hot melt adhesive in the molten state increases rapidly. This will prevent the film-covered product from melting and softening when it is heated again, and the wireless binding will ensure that the spine will not leave the shell and blisters when it is heated again. In order to ensure the suitability of wireless perfect binding, it has created good conditions and made the quality of perfect binding and laminating products more guaranteed.
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