• The process by which paper absorbs ink
    The process by which paper absorbs ink

    2024-05-23

    Paper ink absorption is not only related to the degree of porosity and capillary state of the paper, but also related to the surface properties of the paper fiber, the content of fillers, pigments, adhesives, ink composition and characteristics, printing methods, printing pressure and other factors. In actual printing, the absorption of ink by paper can be divided into two stages. The first stage is the printing press stamping moment, relying on the role of printing pressure to transfer part of the ink to the surface of the paper into the larger pores of the paper, that is, the ink as a whole (including the pigment in the ink) into the paper pores, this process is generally called pressure penetration stage. At this stage, the paper's absorption of ink mainly depends on factors such as the size of the printing pressure, the structure of the paper and the viscosity of the ink. If the printing pressure is large or the structure of the paper is loose, the absorption capacity of the paper to the ink will also be strong. In general, the printing structure of loose paper, such as newsprint, letterpress paper and other non-coated paper, the printing pressure should be smaller, the ink viscosity should also be lower. And paper with tight printing structure, such as coating paper, the printing pressure can be appropriately large, and the ink viscosity can be slightly higher. The second stage is from the paper to leave the imprint area until the ink is completely dry, this stage mainly relies on the capillary action of the paper to absorb the ink, called the free penetration stage. At this stage, the binder is separated from the ink as a whole and enters the inside of the paper at a fairly slow speed through small pores and the rough surface of the paper fibers. Therefore, this process is actually the process of migration of the binder from the ink to the pores of the paper, because the binder is separated from the ink as a whole, it will change the conjunctival nature of the ink film retained on the paper, and the fixation and drying of the ink stain will also be completed in this process. At this stage, the absorption rate of the paper to the ink determines the gloss of the print, and whether it will occur through printing, powder and other phenomena. When the ink is transferred to the paper, over time, the low molecular binder (solvent) will begin to penetrate into the paper layer, so that the solvent content in the ink layer on the paper will decrease, the ink viscosity will increase, and the ink layer will condense. The ink absorption of paper depends on the number of paper capillaries and the size of the capillary diameter. Paper is a porous material, and there are many gaps of varying sizes between fibers and fibers, between fibers and fillers, and between pigment particles inside the paper. These gaps are equivalent to many capillaries. Under the action of these capillaries, the binders in the ink can be absorbed, and the thicker the diameter of th...

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  • Water-based UV base oil for high adhesion paper products
    Water-based UV base oil for high adhesion paper products

    2024-05-22

    Enhance the adhesion of UV ink and UV varnish on paper products! The tape won't come off Fast drying speed to meet the needs of production line Good affinity with UV varnish and UV ink Excellent strength and toughness Water-based UV base oil for high adhesion paper products Anhui Sinograce Chemical waterborne UV primer for high adhesion paper products is a high-performance waterborne coating developed by using the latest environmentally friendly coating technology, which is specially used to increase the printing effect of UV ink and UV varnish on paper substrates. UV curing glazing coatings and UV inks have been rapidly developed in recent years because of their environmental protection and excellent wear resistance and water and oil resistance. However, in the curing of UV photocurable coatings and UV inks, the internal components are cross-linked and polymerized, and the instantaneous change in volume produces a large internal stress, which affects the adhesion of UV ink and UV varnish to the substrate material. Anhui Sinograce Chemical Chemical Co., LTD. 's waterborne UV base oil for high adhesion paper products is a product specially designed for paper, for post printing or UV glazing using waterborne base oil products. Water-based UV base oil for high adhesion paper products is carefully formulated with special functional groups and wetting agents, which can effectively combine with polar groups on the surface of various paper substrates and quickly form a transparent film with high adhesion on the surface of the substrate. On the surface of the substrate with water-based UV primer for high adhesion paper products, UV varnish and UV ink can achieve the ideal adhesion effect, and will not be torn off with tape. In addition, water-based UV base oil for high-adhesion paper products also has the advantages of good film formation transparency and fast drying speed, which plays a role in promoting the development of environmental protection and efficiency in the printing industry. Product Use It is suitable for coating white cardstock, white cow card with grey background, kraft paper and copperplate smooth paper, and color printing UV primer. Product Feature Excellent adhesion, tape does not tear off: The polymer structure of water-based UV base oil for high-adhesion paper products from Anhui Sinograce Chemical contributes to the flow and wettability of molecular chains on the surface of the substrate, making the coating and the substrate molecules in close contact to achieve high adhesion. It won't come off with tape. Anhui Sinograce Chemical high adhesion paper products with water-based UV base oil can play an excellent role in post-sequence printing or UV glazing. Fast drying speed to meet the needs of production line: Anhui Sinograce Chemical high-adhesion paper products with water-based UV base oil drying speed, to meet the requirements of industrial production. Good affinity with UV varnish and ink: Anhui Sinograce Chemical high-adhesion pa...

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  • OPP, PET card film, plastic sealing film primer | primer | adhesive | viscosifier
    OPP, PET card film, plastic sealing film primer | primer | adhesive | viscosifier

    2023-05-16

    The OPP,PET film substrate | is an environmentally friendly coating using advanced material technology, which can significantly enhance the adhesion of EVA on difficult PET substrates and improve the product quality of PE card film. Card film, also known as plastic film, is a plastic film product coated with adhesive and OPP and PET as the substrate, which is widely used in the storage and protection of identity cards, driving licenses, and other flake items. After plastic sealing, it has the advantages of waterproof, anti-smear, anti-moth, anti-mildew, anti-corrosion, easy to clean, clear and transparent, neat and beautiful. However, the surface polarity of OPP and PET materials is low, and the adhesive is a polar material, when the two are combined, the adhesion is not ideal. For a long time, in the production of OPP and PET card film, how to solve the adhesion of EVA on the plastic film substrate such as OPP and PET has been a technical problem. The OPP and PET film substrate | of Sinograce Chemical Company has been carefully designed with special functional groups, which can effectively combine with the polarity group after corona treatment on the surface of PP and PET films to produce a coating with high adhesive force, which plays a good role in the foundation of EVA on OPP and PET film substrates. The OPP and PET coating agent | of Sinograce Chemical Company successfully solves the problem that the surface of PP, PE and PET plastic film is difficult to adhere, and provides an efficient solution for the development of high quality and environmental protection of card film products. Product feature Effectively improve the adhesion of pressure sensitive adhesives and OPP and PET substrates: Because OPP and PET plastic films are weakly polar materials, and EVA adhesives are polar materials, EVA adhesives are difficult to attach directly to the surface of OPP and PET plastic films. The OPP, PET film primer | adhesive of Sinograce Chemical Co., Ltd. has special functional groups, which can effectively bond with the polar groups treated by corona on the surface of OPP and PET films to produce a coating with high bonding force, which plays a good role in laying EVA adhesive on the substrate of PET tape. Prevent pressure sensitive adhesive from penetrating into the substrate and improve the coating quality: The OPP, PET coating agent | of Sinograce Chemical Company adopts self-crosslinked resin to provide a physical barrier between the body film and the adhesive, which can prevent the low molecular weight substances in EVA adhesive from penetrating into the film, which is conducive to the long-term stability of the substrate film. Outstanding high temperature resistance: Sinograce Chemical Company's OPP, PET card film substrate | high temperature performance is excellent, will not yellow at high temperature, affect the quality of plastic sealing products. Fast drying speed to meet the needs of production line: Sinograce Chemical Company's OPP, PET ...

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  • PET label primer
    PET label primer

    2024-05-15

    PET label primer Cost-effectively improve the printability of PET labels Excellent adhesion with PET label substrate Good affinity with all kinds of ink Good weather resistance, no yellowing Easy to use, safe and environmentally friendly PET label primer is a water-based coating designed to improve the printability of PET label paper with advanced material technology and formulation technology. Due to the excellent dielectric properties of PET, and good anti-fouling, anti-scratch, high temperature resistance and other properties, PET labels are widely used in food packaging, electronic appliances, medical and other fields. However, for a long time, the adhesion of ink on the surface of PET substrate has been a technical problem. The PET label base coating agent of sinograce Chemical Company has been carefully designed and has special functional groups, which can be effectively combined with the polar groups on the PET surface to quickly form a transparent film with high gloss and excellent adsorption for all kinds of inks, and improve the printability of PET substrates. On the basis of high adhesion, PET label base coating has good weather resistance and does not yellow. The PET label base coating of Sinograce Chemical Company has successfully solved the problem of printability of PET surface, providing an efficient solution for the printing of plastic label surfaces on PET substrates. Product feature Cost-effectively improve the printability of PET substrates: Since PET is a weakly polar material, printing directly on the PET surface will cause the printability of the ink to decrease. PET label primer successfully improves the printability of the ink on the PET surface by undercoating, without special equipment or processes. Excellent adhesion with PET substrate: The polymer structure of PET label primer has special functional groups, which help the molecular chain flow and wettability on the PET substrate surface, so that the coating and the substrate molecules are in close contact to achieve high adhesion. It has excellent absorbability for all kinds of inks: PET label base coating is carefully prepared, and the ink has a certain penetration effect on the PET label base coating, which improves the wetting ability of PET to UV ink, increases the firmness of UV ink, and eliminates the insufficient adhesion of UV ink on the PET substrate. Good weather resistance, no yellowing: PET label primer has excellent weather resistance and can be widely used in various occasions. Easy to use, safe and environmental protection: PET label base coating is a single-component product with water as a dispersing medium, does not contain heavy metals, environmental protection, non-toxic, no combustion and explosion risk, and can meet the environmental protection requirements of the European Union.

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