Making grill shrimp, vegetables, and diced meat more easier and delicious. The professional manufacturing in the barbeque set, our grill top rack are accepted by the world wide market,it can "NET" your color life.Our bbq grill basket have so many type for your necessary that including hamburger grill rack,non-stick painting grill top rack,large capacity bbq grill basket. Certainly, customized is accepted. Bbq Grill Basket,Grill Basket,Fish Grill Basket,Vegetable Grill Basket MEO DEMO CO., LTD. , https://www.meodemo.com
Exposure of the formulation of gravure ink for high temperature resistant cooking bags
1. Selection of ink connecting materials for cooking bags
There are only two types of ink resins suitable for machine printing on gravure: high temperature resistant polyurethane resins for gravure inks and ternary chlorinated vinegar resins with high chlorine content and medium viscosity.
High temperature resistant polyurethane resin for gravure ink, chemical name polyurethane plastic resin, English abbreviation code is PU. It is a liquid resin obtained by reacting polyurethane monomer resin liquid with polyether polyol or polyester polyol through a catalyst and other additives. According to the composition of these liquid resin raw materials, it is divided into polyether type and polyester type. Species, and there are soft and hard points. When selecting the polyurethane resin liquid for ink, we require that the ink made has excellent adhesion to the plastic film, the ink film has good heat resistance and boiling resistance, good solvent release, less residual amount, and wetting of the pigment Good wettability, high gloss and other properties. Most of the polyurethane resin liquids for inks currently on the market are polyurethane compounds, isopropyl alcohol, methyl ethyl ketone, toluene, etc. The appearance is colorless or light yellow transparent viscous liquid with a solid content of generally 25 -35%, the amount added in the ink formula is usually 35-45%.
The high-chlorine content vinegar resin used in high-temperature inks is actually a copolymer of vinyl chloride (VC) and vinyl acetate (VAC), which is essentially a dry paint base. After the volatile organic solvent contained in the ink system evaporates quickly on the surface of the plastic film in ink printing, the ternary chlorinated vinegar resin with high chlorine content can be combined with other system compatible resins to form an ultra-thin ink film. In the gravure compound high-temperature cooking bag ink formula, we generally choose the film with high toughness, long-term flexibility, wear resistance, low water swelling, low permeability, high temperature cooking resistance and other characteristics. Chlorine vinegar resin.
2. Selection of high-temperature composite cooking-resistant toner and pigment
The composite high-temperature retort bag ink for gravure printing has a series of special requirements for its toner and pigments: bright colors, good gloss, and a colorful world to be decorated with dazzling colors; high tinting power, which is measured Conditions for the use and economic value of pigments; transparency and hiding power are better. According to different uses of inks, there are different requirements for the transparency and hiding power of pigments; the amount of oil absorption should be small, so that the ink concentration can be easily improved and the ink properties Easy to adjust; wetting and dispersing properties are better, and the ability of pigments to disperse in the ink binder directly affects the success or failure of ink making. Other physicochemical properties, such as light resistance, heat resistance, solvent resistance, acid and alkali resistance, migration resistance, etc., have few pigments, and only select suitable varieties according to the special requirements of the application.
The pigment used in the compound high-temperature retort bag ink used for gravure printing must first be resistant to solvents, and secondly must have high-temperature retort resistance, which can withstand high temperatures above 120 ° C without decomposition and discoloration. According to the standard of retort bag ink, the black pigments used in the ink should all be channel carbon black; most of the white pigments use rutile titanium dioxide modified by silica, and some are modified by alumina, but their temperature resistance turns yellow Slightly poor; color inks should be selected for ink-jetting tests conditionally, such as phthalocyanine blue and phthalocyanine green, resin-treated surface of pigment particles, benzimidazolone azo, condensed azo, etc., according to the test They can withstand high temperatures above 180 ° C without discoloration.
3. Selection of wetting and dispersing agent for gravure ink system
The wetting and dispersion of high-temperature-resistant toner and pigment is an important part of the manufacturing technology of high-temperature retort gravure plastic composite ink. It crushes the ink vehicle and pigment into fine particles, so that they are evenly distributed in the ink mixture. In order to expect a stable suspension mixing medium viscosity system. The wetting and dispersing agent is essentially a special surfactant, which has both wetting and dispersing functions for the pigment. Its wetting and dispersing effect is to reduce the surface tension of the substance, so that the molecules of the surfactant are adsorbed on the surface of the pigment, thereby generating charge repulsion or steric hindrance, preventing harmful flocculation of the pigment, and making the dispersion system in a stable suspension state .
The dispersant for composite high-temperature resistant retort bag ink for gravure printing is generally anionic surfactant. Its main component is carbonate or special metal aluminum chromium compound, light yellow or yellow-brown liquid, which is oil-soluble dispersion. It can improve the dispersion performance of pigments in inks, prevent the overflow and discoloration of pigments in inks, improve color density and color development, and enhance the adhesion and compound fastness of ink films and plastic films.
4. Selection of special wax powder for high temperature resistant cooking bag ink
Special high temperature resistant wax powder is usually added to the compound high temperature retort bag ink formulation for gravure printing, which can provide excellent anti-wear and scratch resistance for the high temperature resistant ink film of the printed product, prevent adhesion and increase the ink on the machine Liquidity, improve printability and improve post-processing performance.
Most of the formula design of compound high temperature resistant retort bag ink for gravure printing is to choose molecular linear synthetic polyethylene wax with high melting point and strong hardness. There are two ways of adding before and after adding in the ink production process. 0.5-1.0% of the total weight of the ink. Normally, it is added before the ink coarse material is grinded, which is beneficial to dispersion and improve fluidity; however, it should be noted that the grinding temperature should not be too high, so as not to deform and agglomerate these wax powder particles, which affects their performance. There are also pastes made of ink system resins and organic solvents to make pastes—wax pastes, which are added during the viscosity adjustment and color matching stage of ink making; however, doing so should prevent certain organic solvents with strong penetrating power from dissolving the wax powder particles. Recrystallization occurs and returns to coarseness, and the performance of the special wax powder is lost.
5. Selection of high-speed printing antistatic agent
During high-speed printing of gravure plastic ink, the accumulation of static electricity will cause problems such as offset, blur, spots, beards, edge repulsion, etc. In severe cases, even vicious events such as fire and explosion may occur. Therefore, the purpose of adding an antistatic agent to the ink is to reduce the surface resistance of the plastic film during the printing process and eliminate static electricity to solve the above problems that occur during printing. Anionic antistatic agents are generally used in plastics and inks, including higher fatty acid salts, alkyl phosphate ester salts, alkyl sulfate ester salts, and sulfonate ester salts. This type of compound is soluble in water, ketones, and alcohols. Organic solvents, such as benzenes and benzenes, are sold as aqueous solutions of organic solvents containing active substances ranging from 30 to 60%. The compound high-temperature retort bag ink used in gravure printing mainly uses isopropyl alcohol solution of ethyl phosphate as the antistatic agent, and the added amount accounts for 0.1-0.4% of the total amount of ink, without any adverse effect on the ink properties.
6. Adhesion promotes the selection of resin and fumed silica powder
In the ink system of polyurethane and chlorinated vinegar resin in compound high-temperature retort bag ink for gravure printing, due to the insufficient flexibility of chlorinated vinegar resin itself, it is necessary to use adhesion promoting resin to improve its flexibility; High-temperature retort-resistant bag ink formulations need to add some modified chlorinated polypropylene resin liquid, the solid content is generally about 15-25%, to improve the adhesion of polyurethane ink on plastic film, enhance the dispersion effect and fluidity.
Fumed silica powder, also called matte powder, generally undergoes organic surface treatment and is easy to disperse. Its role in composite high-temperature retort bag inks for gravure printing: A. Prevent pigment settling and maintain long-term rheological properties and fineness of ink; B. Improve ink film sag performance when printing on machine, prevent The generation of water ripples; C, like wax powder, is beneficial to the uniform coating of the adhesive and improves the composite fastness.
7. Selection of organic solvents for gravure-resistant high-temperature cooking bag ink system
Plastic gravure ink is mainly formed by drying the solvent to form a film. When the ink is printed on the surface of the substrate, the thickness of the ink film decreases and shrinks due to the volatilization of the solvent. Ink solvent volatilization film formation is mainly divided into two stages: the first is the "wet stage", controlled by the surface layer; the second is the "dry stage", the solvent evaporation rate is controlled by the diffusion of the solvent in the overall ink film. When there is a true solvent, ensure that the resin and other polymers are fully extended and interact, and the leveling is good. If the true solvent volatilizes too fast and the residual solvent is only a co-solvent, the polymer molecules tend to form tight curls or even precipitate out. Especially important is that solvent evaporation causes endothermic cooling and polymer concentration to increase, so that the surface tension of the ink film increases, and the resulting solution flows from the low surface tension area to the high surface tension area. This is the peak flow, which is easy to produce "orange peel" And floating color phenomenon, so maintaining the necessary amount of true solvent is an important condition to ensure ink film leveling.
For the ink systems of polyurethane and chlorinated vinegar resin, toluene, xylene, ethyl acetate, methyl ethyl ketone, and isopropyl alcohol are commonly used solvents. In addition, acetone, methyl isobutyl ketone, ethylene glycol monobutyl ether, Propylene glycol methyl ether and other special organic solvents. Among them, benzenes and alcohols are only co-solvents for polyurethane and chlorinated vinegar resins. Although ketones and esters are true solvents, the volatilization rate is too fast. Therefore, special solvents such as methyl isobutyl ketone, ethylene glycol monobutyl ether, and propylene glycol methyl ether should be used to adjust the volatilization rate and solubility, enhance the dispersion power of the mixed solvent, improve the dissolution parameters, and make the ink always show a good fluid. State to ensure the smooth progress of the printing work.