Modern people can't live without cards, except for bank cards, social security cards, bus cards, and fuel cards. Since these cards are mostly made of PVC material, they are collectively referred to as PVC cards in the industry. Ordinary PVC card consists of two layers of base and two layers of transparent film, mostly UV Offset printing Printing , the card presents delicate lines and rich layers. However, the large application of UV offset inks will also bring many negative effects. For example, if the ink layer is too thick and the dot area ratio is too large, the peel strength of the PVC card will be lowered. In this regard, card manufacturers generally use a film with a film to improve the situation. The adhesive film is a PVC mask coated with a polyurethane adhesive layer, and the NCO active group decomposed in the adhesive layer can be chemically crosslinked with the PVC card to improve the peel strength of the PVC card and improve the insufficient adhesion of the PVC card.
In this paper, the lamination experiment of PVC tape film and PVC field test substrate is used to simulate the actual situation in production. By adjusting the lamination time and lamination temperature, the lamination temperature and lamination time of PVC card peel strength and appearance quality are studied. Impact.
Experimental part
Experimental equipment
Four-color UV offset printing machine, laminating machine, die-cutting machine, tensile machine, PVC white film base, PVC tape film, UV offset black ink.
2. The production of PVC field test base
In the field printing, the experimental environment temperature is (23 ± 3) ° C, and the relative humidity is 40% to 60%.
Cut the PVC white base into a size of 140mm × 140mm, open the four-color UV offset press, check its performance to ensure that it is in normal working condition, and ensure that the UV lamp matches the wavelength of the UV ink. Prepare the experimental materials and sandwich several PVC white bases into the PVC pressure film base. Note that the printed surface of the PVC white base should face up. Fix the PS plate and wipe with a dampening solution, then apply ink to the ink roller. Then turn on the UV lamp, start the test, and use the densitometer to check the density of the field and pay attention to the curing of the ink layer. After the solid density reaches the requirement, a certain amount of PVC field test substrate is printed.
3. Lamination experiment
(1) PVC laminated film parameters
In the lamination experiment, three process parameters were set according to the characteristics of the lamination process, namely lamination temperature, lamination pressure, and lamination time. Experiments were carried out by fixing two process parameters, changing the other process parameters, and obtaining experimental data. The experimental data obtained from the experimental data are compared and analyzed with the experimental data obtained, and the actual process parameters are obtained.
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