Molded pulp products strengths and weaknesses
Date：2017-08-16 Hits：
Modern packaging commonly used paper, plastic, glass, ceramic, metal as a packaging material, due to the cheap paper and plastic prices ease of processing, and a wide range of sources of raw materials, so the paper and plastic packaging materials in everyday life very wide range of applications. However, because it is not degradable plastic packaging materials on their own, will cause environmental pollution and other issues, the problem of white pollution is the most typical example.
With the development of society and the demands of global economic integration, green packaging is becoming the consensus of society, and become another highlight of the development of China's packaging industry. Quantitative evaluation by international experts determined that the paper is only the most promising green packaging materials. In recent years, the development of equipment Molded products very fast, and gradually mature. As the range of applications of molded pulp products continue to spread, increasing demands molded paper products, pulp molding production process and tooling design, and so need to constantly improve and improve. In this paper, the characteristics of molded pulp products, processes, analyzes the status quo of today's molded pulp products, and certain elements of pulp molding products mold design were studied.
Second, the process of analyzing a molded pulp products.
Under normal circumstances the process, the production process of pulp molding products shown in Figure 1, the production process for different product requirements may vary depending on the customer, including stock preparation, forming, pressing stereotypes, stereotypes , integer and packaging and other auxiliary processes.
2. Select the pulp molding products, raw materials source of molded pulp products are divided into: pulp, straw and reed pulp, usually bleached market pulp (for snack) or paper (for industrial packaging), in production and use of the process does not produce secondary pollution, the product has light weight, compressive shock, good cushioning properties, antistatic, breathable and good recyclability advantages. As packaging products, can replace polystyrene foam (EPS), for a one-time snack, a variety of electronic products, handicrafts, medical equipment, machinery parts, eggs, fruits, flowers, glass, ceramics and other packaging fragile products.
Molded pulp products generally divided snack category and industrial packaging, production method is basically the same, only the raw materials used for the production of snack bleached market pulp, quantitative and specifications and other indicators are more stringent, and to be sterilized, water and oil processing equipment and pipelines are mostly stainless steel and plastic material, the inner wall of the storage pool lined with tiles, for plant and operating personnel hygiene requirements are also higher.
3. Pulp Pulp production of molded pulp products first process. Pulping processes include: water power pulper crushing the pulp into fiber pulp, crushing the fiber slurry was screened Desanding purification treatment, the fibers through the refiner appropriate sub-wire broom to improve the binding force between the fibers.
In the pulping process, strictly control the molding of various pulp freeness is crucial to the process behind the product and product quality. Freeness is too high, when the product is vacuum forming, will produce water treatment difficulties, through bake drying, the product will have a greater shrinkage deformation (excluding the mold dry). If the beating is too low, the low bond strength, product stiffness and compressive strength will be greatly reduced, it will affect product performance. It should be determined according to the corresponding selected freeness pulp, the ratio between the slurry and the number of needed amount of beating.
Pulping process pulp molding products used equipment are Hydrapulper, fiber relief Desanding, conical Desanding beater (or refiner) and pulp and paper industry and other general equipment pool. For relatively simple and small-scale production process, only hydrapulper and plasma pools can also meet the general production requirements.
With the development of society and the demands of global economic integration, green packaging is becoming the consensus of society, and become another highlight of the development of China's packaging industry. Quantitative evaluation by international experts determined that the paper is only the most promising green packaging materials. In recent years, the development of equipment Molded products very fast, and gradually mature. As the range of applications of molded pulp products continue to spread, increasing demands molded paper products, pulp molding production process and tooling design, and so need to constantly improve and improve. In this paper, the characteristics of molded pulp products, processes, analyzes the status quo of today's molded pulp products, and certain elements of pulp molding products mold design were studied.
Second, the process of analyzing a molded pulp products.
Under normal circumstances the process, the production process of pulp molding products shown in Figure 1, the production process for different product requirements may vary depending on the customer, including stock preparation, forming, pressing stereotypes, stereotypes , integer and packaging and other auxiliary processes.
2. Select the pulp molding products, raw materials source of molded pulp products are divided into: pulp, straw and reed pulp, usually bleached market pulp (for snack) or paper (for industrial packaging), in production and use of the process does not produce secondary pollution, the product has light weight, compressive shock, good cushioning properties, antistatic, breathable and good recyclability advantages. As packaging products, can replace polystyrene foam (EPS), for a one-time snack, a variety of electronic products, handicrafts, medical equipment, machinery parts, eggs, fruits, flowers, glass, ceramics and other packaging fragile products.
Molded pulp products generally divided snack category and industrial packaging, production method is basically the same, only the raw materials used for the production of snack bleached market pulp, quantitative and specifications and other indicators are more stringent, and to be sterilized, water and oil processing equipment and pipelines are mostly stainless steel and plastic material, the inner wall of the storage pool lined with tiles, for plant and operating personnel hygiene requirements are also higher.
3. Pulp Pulp production of molded pulp products first process. Pulping processes include: water power pulper crushing the pulp into fiber pulp, crushing the fiber slurry was screened Desanding purification treatment, the fibers through the refiner appropriate sub-wire broom to improve the binding force between the fibers.
In the pulping process, strictly control the molding of various pulp freeness is crucial to the process behind the product and product quality. Freeness is too high, when the product is vacuum forming, will produce water treatment difficulties, through bake drying, the product will have a greater shrinkage deformation (excluding the mold dry). If the beating is too low, the low bond strength, product stiffness and compressive strength will be greatly reduced, it will affect product performance. It should be determined according to the corresponding selected freeness pulp, the ratio between the slurry and the number of needed amount of beating.
Pulping process pulp molding products used equipment are Hydrapulper, fiber relief Desanding, conical Desanding beater (or refiner) and pulp and paper industry and other general equipment pool. For relatively simple and small-scale production process, only hydrapulper and plasma pools can also meet the general production requirements.
