The advent of water repellents
In the 90s of last century, it was the fastest time for the development of cartons in China. However, at the same time, the company is facing the requirement of the customer to put forward the moistureproof performance of the carton, because there is no better way to solve it at one time. Therefore, they had to use traditional tung oil, flaring water, water glass, etc. for painting. Although they can achieve a certain degree of moisture protection, they do not fully meet the requirements of environmental protection. Even some carton manufacturers have to pay foreign exchange high prices to meet the requirements of customers in terms of safety and health, but also meet the environmental requirements of carton moisture-proof coatings to solve this problem. Faced with this situation, the domestic carton industry is eagerly looking forward to the development of a carton moisture-proof paint that meets the requirements of safety, hygiene and environmental protection. The new carton anti-moisture paint water repellent was successfully developed in Chengdu in 1992. Since it was launched on the market, it has been favored and praised by carton manufacturers.
The advantages of water repellent
â– Low cost. The water repellent is super-concentrated
The paint can be used by diluting 1 ton of tap water with about 15 tons. Not only greatly reduce the transportation costs, but also increase the cost of 1 to several cents per square meter of carton surface (due to paper differences, consumption is not the same, the required cost is also different).
â– Simple and convenient operation. Can be synchronized in the automatic production line of Corrugated Board, cardboard before the compound water repellent with the conveyor belt automatically coated on the cardboard surface, after the composite process into the automatic drying area immediately dry, you can complete the moisture-proof treatment, and There is no impact on the printing of the subsequent process. At the same time, the surface color of the coated corrugated board remains unchanged, and the strength increases.
â– Good moisture proof effect. After the water repellent is applied, the formed carton will not be deformed due to moisture, and the compressive strength, punching force and storage time of the carton will be greatly improved (the moisture content of the paperboard will increase by 1%, and the compressive strength will decrease. 3%), and stable performance.
â– Significant moisture resistance features. After the water repellent was applied, the surface of the paper product did not adhere to the water, and the fluidity was good. The surface of the carton was smooth, the pH value was neutral, and the water stayed on the surface for about 3 hours without infiltration. Because the water repellent is a non-toxic, odorless, non-corrosive, non-flammable, non-explosive, non-hazardous, safe and hygienic environment-friendly green environmental protection moisture-proof coating, it has been used and compared by users of carton manufacturers for many years. It proves that this product is completely comparable to similar foreign products, and is an ideal moisture-proof coating that replaces imported moisture-proofing agents and uses traditional tung oil, flaring water, water glass and other harmful solvents.
■easy to store. In the storage state can not afford any changes in quality, suitable for storage above 0 °C, the normal storage period of up to 2 years.
Water repellent performance and cost analysis
Because of the high quality and low price of this product, the Chengdu City Center for Product Quality Supervision and Inspection (China Center for Quality Testing of Packaging Products in Chengdu) tests all indicators better than the relevant national standards (refer to "Compound Food Packaging Bag Standard GB9683-88"). ).
The price of water repellent: 10,000 yuan/ton, but the actual cost is:
â– Diverted to 1:20, approximately RMB 476/ton
â– Divided into water at a ratio of 1:15, approximately 625 yuan/ton
â– Divided into water at a ratio of 1:10, approximately 900 yuan/ton
The price of the traditional tung oil moisture-proof agent is 6,000 yuan/ton; the glazing moisture-proof agent is 4,000 yuan/ton; and it cannot be used with water.
Problems that should be paid attention to in the application of water repellent
From the development, production, and sales of water repellents, in the course of more than 10 years, it also triggered other ideas, and it has a positive meaning to this day.
â– Application issues in the paper industry. Some paper mills, after learning of the information of this water-repellent agent, have initiated positive thoughts about whether it can be applied in the production process of papermaking in order to provide paperboard manufacturers with moisture-proof performance paper. In this regard, after investigation and analysis, on the one hand due to the variety of carton manufacturers, specifications, quantity, price, supply channels and many other factors, it is inconvenient to arrange production and sales; on the other hand, carton manufacturers have the same problem Affected, paper mills are difficult to meet their wishes. Nevertheless, with the large-scale development of the carton industry, these good wishes will be realized sooner or later.
â– Carton application problems. Some carton manufacturers may temporarily fail to achieve scale. It is difficult to reach an agreement with the papermaking companies at one time. However, there should be some solutions. For example, carton manufacturers can take the road to union. First, a number of carton manufacturers signed a purchase contract; the second is that paper companies can understand how many quantities need to be treated with moisture-proof agents in order to organize production according to the same variety, specifications, price, etc. ordered by each carton manufacturer. Meet the needs.
â– Other carton application issues. Since the carton is treated with a moisture-proof agent, the performance and quality of the packaged product can be effectively improved, so the application range should be increased. If it can be expanded to cartons, paper bags, paper drums, honeycomb cardboard cartons and other manufacturing enterprises, so that they can be inspired from the carton packaging applications, and actively adopt, in order to improve the moisture resistance of their products, as well as expand the field of packaging applications, will be large There are benefits. At the same time, some cartons can replace some paper-plastic composite bags after using moisture-proof agents, which can reduce the cost of enterprises and help reduce the generation of garbage.
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