Discussion on Production Process of Environmentally Friendly Waterproof Corrugated Box
Corrugated boxes have wider and wider use range due to their light weight, good cushioning performance, low cost and easy logistics. However, corrugated boxes are easy to absorb moisture and get wet, and the physical properties of the corrugated boxes will drop sharply after water contact. Seriously affect commodity logistics. Therefore, for some products with higher humidity, the corrugated box used for packaging must have a certain moisture-proof and waterproof function (as shown in Figure 1). However, the conventional production processes of waterproof corrugated boxes circulating on the market currently have some defects and are not easily accepted by Western countries. In order to enhance the competitiveness of China's corrugated box products in the international market, our company successfully realized the industrialized production of environmentally friendly waterproof corrugated boxes through technology research and development and process innovation, which greatly promoted the development of China's corrugated box manufacturing industry. Defects in the conventional production process of waterproof corrugated boxes At present, the common waterproof corrugated cardboard boxes on the market mainly achieve water-proof function by coating water-repellent, laminating, dipping wax or directly using calcium plastic carton on the surface of corrugated cardboard, but these processes have more or less defects. . The best way to achieve the water-repellent coating process is to use special coating equipment, which is currently used in wire rod coaters, knife coaters and spray coaters, but due to the utilization of such equipment. Not high, so most corrugated box manufacturers will not be equipped, but instead use a simple coating tank on the corrugated board production line to replace, but because the corrugated board production line is not a professional coating equipment, it is easy to appear coating The phenomenon of the average. However, either way will face a critical problem - poor printability, even if the coating is very small, there will be dragged ink printing, crowded side of the phenomenon, in order to achieve the waterproof coating level, printing is even more difficult. Although the waterproofing method such as laminating, dipping wax or calcium plastic carton is particularly good, but the production efficiency is low, and it is not conducive to environmental protection, it is rejected by Western countries. Waterproof corrugated box performance requirements Water absorption is an important technical index for evaluating the waterproof performance of corrugated boxes. The smaller the water absorption, the better the waterproof performance. According to the national standard GB/T 13024-2003 "box cardboard", the frontal water absorption of kraft boxboard is ≤35g/m2 is superior, and ≤40g/m2 is first-class. The water absorption test can be carried out according to the national standard GB/T 1540-2002 "Determination of the water absorption of Paper and paperboard", the water immersion time is generally 2min. The quality of the corrugated cardboard box is mainly determined by the quality of the coating and the thickness and uniformity of the coating. According to the different protection grades of various types of packaging materials, our company generally requires that the coating amount of moisture-proof corrugated boxes is ≤3g/m2, and the coating amount of waterproof corrugated boxes is ≥15g/m2. After testing, the environmentally friendly waterproof corrugated carton developed by our company has a water-based waterproof oil coating amount of ≥12g/m2, and the water absorption measured by the Bob method is only 0.2g/m2, which is far lower than the water absorption of 10g/m2 in the same industry. It has excellent waterproof effect. Environmentally friendly waterproof corrugated box production process characteristics The innovation of the environmentally-friendly waterproof corrugated carton developed by our company is that the gravure pre-printing process is applied to the water-based waterproof oil coating, which solves the problems that the conventional production process is not environmentally friendly, low in efficiency, difficult to print, etc., and through special structural design, Corrugated cardboard can be folded into a box after die cutting. The specific features are as follows: Soft Paper,Soft Tissue Paper,Softest Toilet Paper,Ultra Soft Toilet Paper ShanDong YongFang Sanitary Products Co.,Ltd , https://www.sdyongfang.com