Brief introduction of production technology and quality requirements of paper tableware

Like other tableware, paper tableware must meet the physics and chemistry requirements of GB11680 "Standards for Raw Materials for Food Packaging". It must not contain fluorescent whitening agents and other toxic and hazardous substances. The second must meet the use process. The performance requirements and general technical specifications in the product, that is, the waterproof and oil-repellent performance of the product, should ensure that the liquid does not permeate at a certain temperature and within a certain period of time. No serious deformation occurs under a certain number of stacks, and there are also Microbiological tests and toxicological tests must meet the requirements.

According to the quality requirements of paper cutlery, the structure of white cardboard coating PE can be divided into two types: paper jam type and sandwich jam type.

The paperboard base paper is usually made from 100% imported bleached wood pulp, which is characterized by not only the appearance of the paperboard is beautiful and comfortable, but also the use performance is good.

The paper sandwich type paper base structure is based on China's being a big country in agriculture, with few forest resources and lack of wood propellers. It is mainly due to the redesign of the basic national conditions of high foreign import prices. Imported bleached wood pulp is used on the upper and lower layers of the paper (top layer and bottom layer) to ensure that the paper has a certain degree of whiteness and a comfortable appearance without the use of fluorescent whitening agents. The middle layer (core layer) of cardboard can be replaced with a part of low-priced domestic materials. In this way, under the condition that the paper quality meets the hygienic standards and other quality requirements for the food packaging base paper, it can not only greatly reduce the use of imported bleached wood pulp, but also significantly reduce the production cost of the product.

It is the most common method to use the non-toxic and harmless PE coating on the surface of paper to achieve the waterproof oil performance of cardboard and the ability of liquid penetration. PE not only provides cardboard with a reliable waterproof performance, but also serves as an indispensable adhesive in the box making process, which greatly simplifies the box making process. In addition, the use of PE coating method, the base paper and PE film can be used, are now used in foreign countries in the form of white paper surface PE coating (double-sided coating PE).

Whether it is the method of laminating PE on the surface of the paper sheet or the method of applying the water repellent agent, only one side of the paper sheet needs to be filmed or coated. Because the inner layer of the lunch box is in direct contact with the food, pigment coating can be used to achieve certain waterproof and oil-repellent properties. Because the pigment coating cost is lower than that of the lamination film PE, and the pigment coating can be completed at the same time in the process of operating the base paper, the production process flow is greatly simplified, and in particular, the pigment-coated paper generally has good printability. Compared with the special process technology required for printing on PE film, its popularity and versatility are stronger. In this way, not only the production cost is reduced, but also the printing operation is facilitated, and the printing of the paper tableware is its greatest advantage.

The prerequisite for the quality of special cardboard products is that they must meet the hygienic standards for raw paper for food packaging, and the detection of fluorescent substances must be qualified. This does not seem to be a very difficult problem, as long as it pays attention to the fact that fluorescent substances such as optical brighteners are not added during production.

There are many varieties of paper sheet reinforcing agents, and the issues that require special attention are also requirements for food hygiene. They must be non-toxic and harmless. There are also many methods for reinforcement, which can be added in the slurry or can be sprayed on the paper machine; it can be added in one type of slurry, or it can be added in several different types of slurry simultaneously; it can be used alone. Agents can also use several additives at the same time. In short, the principle of adding auxiliaries is to ensure that the stiffness of the paperboard is significantly improved under the premise of ensuring that food hygiene standards are met, but it does not affect the operation of the paper machine to ensure normal production.

The waterproof and oil-repellent properties of paperboard can't ignore the anti-liquid penetration ability of the paper sheet except for the front and back surfaces of the paper sheet.

The most basic requirement for laminating a layer of PE on the surface of the paperboard or applying a layer of water repellent is lamination or coating.

Generally, after taking various technical measures, the quality and internal quality of the special paperboards for fast food boxes produced, as well as the box-making performance and performance, can reach and approach the level of imported paper.

In the long run, environmental protection is a long-term basic national policy of China. Therefore, replacing plastic tableware with paper cutlery is a general trend. It is just around the corner. Its market potential is very large, and its promotion and application prospects must be very broad.