The technical characteristics and versatility of the film material make it possible for the machine to produce products with non-paper based materials.
The technical characteristics and versatility of the film material make it possible for the machine to produce products with non-paper based materials.
The physical, thermodynamic and surface properties (PE, PP, PVC, etc.) of the plastic film determine the production process and end use of the film. Regardless of the requirements of the production process and end use, the film must first be manufacturable so that it does not permanently deform or be destroyed after undergoing a difficult transportation process. The tensile strength, yield point and modulus of the film are critical and must be sufficient to maintain the elongation of the film below the permanent deformation point and also to withstand the tension of the film as it passes through the converter.
In order to prevent deformation, it is important to not exceed 10% of the yield point during transportation. At the same time, when winding is required, the lower load can avoid over-tightening, the web structure of the film being stretched or becoming loose. Most of the mesh structures undergo periodic (short cycle) frequent start and stop processes in the converter. The film must be impact resistant and reduce the risk of damage to the mesh structure caused by sudden acceleration. Make sure that the structure of the film can face these problems even if the operator does not operate well. Not all films are the same, they have their own characteristics. Taking oriented polypropylene (OPP) as an example, OPP has high strength and good dimensional stability, and is also suitable for applications requiring permeability. In addition, OPP can provide obstacle resistance. The complex and multi-layered structure makes OPP very strong and is therefore widely used in food, non-food, and industrial applications. However, unlike polyethylene, OPP can be pierced, causing process defects and structural damage. Gravel and gravel appear on any rotating surface and cause surface damage, so the runner cannot be used if the material is likely to be damaged.
Polyolefins such as polypropylene have good tensile properties, strength and modulus. From a machine point of view, just pay attention to it, be careful, and it will be ready to complete production at any time.
PP has become the most widely used film material because of its diversity. The biaxially oriented PP (BOPP) film can be stretched in both the longitudinal and transverse network structures. It has rigidity and standing and can be used in the production of plastic bags and bags.
PP, OPP and BOPP are both extensible, so when they become hot during processing, the properties tend to be elastomers. Tension and temperature are closely related. For example, high temperatures and high tensile forces will make the film more elastic. In order to avoid production-related problems: for example, when printing, the level of tension is generally kept low, and stretching is minimized, especially when the film is hot.
The tension of the mesh structure affects the accuracy and consistency of the coating or coating thickness, the axial dimensional stability of the network structure, the printability, the quality of the coating and the overall quality.
Although the production, printing and conversion of polymer films are already very conventional and common, there are still many challenges in the innovation of printing machines and conversion machines, or in ink manufacturing. On the one hand, the relatively inert nature of most polymer surfaces makes them difficult to wet with inks, adhesives and other coating materials. Surface energy is a measure of the intermolecular forces in a polymeric substrate; these forces are polar and dispersive forces, respectively.
Polar forces are produced by intermolecular interactions or within molecules, and their ends have different electrical properties, which creates a dipole effect, like the north and south poles of a magnet.
To achieve the desired print results, strong surface polarity is critical. Non-polar forces do not promote wetting and adhesion to the printed surface. Film manufacturing machines, printers and printers can improve wetting and adhesion by surface corona discharge and flame shock treatment. On the other hand, the dynamic surface tension of the coating liquid can be lowered to improve the wetting property.
When the newly manufactured film leaves the calender or extruder at a high speed, and in a semi-molten state, the film can improve the surface energy and form a strong polar bond, because this effect will decrease with time, so the printer Or the transfer machine needs to be surface treated to raise the film to its original level. This reprocessing also removes the migration of impurities and the surface of the cleaning film.
On the other hand, quality control and product development equipment such as RK printing and coating equipment Rotary Koater and VCM (Universal Printing Tester) are often used in thin film applications with corona processors and explosion-proof functions.
Rotary Koater Coating Press
There are many challenges in the manufacture of inks. Developing a product requires not only the end use of the print, but also the various transfer or completion processes that will be carried out. This is true for all end-user production applications, especially film-based products.
Plastic film-based materials allow designers to apply versatile and durable labels and flexible packaging to their products, as well as create unique looks that no other material can't. Because of this, ink and film manufacturing Merchants are so attached to their printing presses and transfer machines.
Appropriate design of the film allows the transfer machine to produce patterned packages that withstand extreme temperatures during freezing or pasteurization and withstand wear on the production line. The new OPP film exhibits versatility in the surface treatment of water-based inks, adhesives, cold sealants, heat-activated sealants and coatings. The two sides of the OPP film are convertible: this allows them to be printed (mainly flexo and gravure), laminated, or metallized to produce cost-effective packaging products with excellent barrier properties.
For ink manufacturers, polypropylene is probably the most promising film for antioxidants, stabilizers, and slip compounds. Each user needs to ensure the quality and reliability of the ink product; resolve the contradiction in the shortest possible time; the production requirements of flexible packaging continue to stimulate the further development of the film substrate, which means that process monitoring and product development tools are widely accepted and regarded as indispensable.
RK printing coater color AC system and trial printing / coating / laminating proofing system, Rotary Koater and high-tech custom system VCM are popular with ink manufacturers, transfer machines, substrate manufacturers for many film-related applications. Our favor. For example: determining ink/substrate interactions; production of small-scale high-end composites/products; color matching and determining suitability for printing/coating/lamination/drying/curing processes.
Like the Rotary Koater system, it offers two main types of printing/coating technology, as well as hot air, infrared and UV curing. On the other hand, VCM can customize the system according to the needs of customers.
FlexiProof 100 Flexo Proofing Machine
For color communication equipment, the award-winning FlexiProof is available in three models: FlexiProof 100, FlexiProof UV and FlexiProof UV/LED, which are aimed at manufacturers who use or produce flexo inks. Because these institutions have different printing processes, K Printing Proofer is a high quality proofing machine for gravure, gravure and flexo inks. At the same time, this equipment also allows dry or wet lamination.
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