Study on Green Packaging of Paper Products (II)

4. Convenient storage and transportation

Paper containers are lightweight, foldable, and easy to load and bundle. They are also easier to handle and store.

5. Easy to shape and decorate

Paper products can be designed in various types of boxes and boxes based on different products. Paper and paperboard have a good performance of absorbing ink and paint, printing performance is good, the printed characters are clear, the patterns are clear, firm and exquisite, and the function of packaging promotion can be well displayed.

6. Does not contaminate the contents

The paper is hygienic, non-toxic and odorless. The carton can be completely sealed, so it will not contaminate the contents. The paper can also meet the storage conditions of respiration products.

7. Good recycling

The paper can be directly recycled or reused in waste paper to produce no pollution to the environment. Paper product packaging is environmentally friendly packaging.

1.3 Environmental Performance of Paper Packaging

With a large amount of paper packaging, in the countries with advanced packaging in the world, paper packaging accounts for half of the total packaging volume and plays a decisive role in the packaging industry.

Due to the characteristics of non-toxic, odorless, breathable, etc., paper packaging can not only pollute the inner packaging, but also maintain the respiration of the inner packaging and achieve better storage conditions; at the same time, the paper packaging is easy to recycle and is easy to use in nature. Decomposition, does not pollute the environment; paper packaging production of raw materials also comes from renewable wood and plant stems, so from a general perspective, the green performance of paper packaging is good, is an environmentally friendly packaging, is sustainable development Industry. With the increasing emphasis on environmental protection and the recycling of resources in the world today, paper packaging has shown its vitality due to its advantages of easy degradation, easy recycling, and easy regeneration. Paper, wood, and paper-based plastic packaging products continue to emerge. The amount of paper on the packaging is also increasing.

Second, the paper product packaging production and waste paper recycling green analysis

2.1 The main sources of pollution in paper production and the main links in cleaner production

The most important pollution in paper production is generated during the pulping process. Pulping can generally be divided into three methods: chemical pulping, mechanical pulping, and chemical mechanical pulping. China's papermaking industry mostly uses chemical pulping. There are three main types of processes: bleaching alkali wheat straw pulping, natural kraft wood pulp, and bleached kraft wood pulp. There are three main sources of pollution in the pulp and paper process.

(1) The black liquor from the pulping section (ie, pulping) and the red liquor from the acid-cooked pulp are used in the cooking section. At present, only some paper mills in China use alkaline pulping. The black liquor discharged is mainly lignin and Carbohydrate degradation products, while the degradation products of carbohydrates are in the state of meta-sugar acid, which is the main contaminant that causes high BOD value in the waste liquor. The contaminants in the acid-cooking waste liquor are also lignin and carbohydrates. Degradation products are the main reason for high COD and BOD.

(2) Chlorine-containing bleaching waste liquid The most serious pollution in paper mills is the discharge of chlorine-containing bleaching waste liquids. Thousands of bleached pulps are produced by paper mills in China. Chlorine-based bleaching technologies such as chlorinated bleaching are used in individual paper mills. Hypochlorite bleaching, etc., hypochlorite bleaching mainly produces chloroform, waste liquid also contains more than 40 kinds of organic chlorides, of which the most chlorinated phenols, such as dichlorophenol, trichlorophenol .

(3) Wastewater from the pulping and papermaking process Other wastes from the pulp and papermaking process, such as paper machine whitewater, are called mid-stream wastewater. They also contain various pollutants. If these wastewaters are not treated, they will also cause environmental pollution. However, these wastewaters are generally suitable. Physical processing can be achieved. In addition, a semi-closed circulation system can be used. The previous process can use the wastewater of the next process as much as possible to reduce the discharge of waste water.

(to be continued)