Introduction to Pulp Molding Knowledge Questions and Answers

Question 1. What are molded pulp products?

Pulp molding products are a kind of three-dimensional pulp products made of plant fiber pulp (wood, bamboo, reed, reed, grass, etc.) or recycled pulp of waste paper products as raw materials, plus professional technology and additives, and vacuum adsorption molding on a special shaped forming mold (also called water mold or net mold).

question 2. what are the scope of application of paper lotus molded products?

Food (medicine) hardware tools, electronic products, ceramics, glass, communication equipment, computer accessories, food, medicine, cosmetics, agricultural products, instruments and meters, all kinds of small household appliances, mobile phones and accessories and other packaging materials,Agricultural products packaging, such as eggs, fruits, vegetables, meat, etc., tableware, lunch boxes, spoons, knives and forks, etc., cultural and creative products, furniture and household goods, gifts, holiday supplies, etc.

Question 3. What are the product characteristics of molded pulp products?

The source of raw materials is not easily restricted, which meets the national environmental protection requirements and industrial development needs. In particular, it is the best choice to replace EPS foam materials and PVC blister packaging materials; pulp molded products can be added and used, can be degraded, and after adding special processes, it has good waterproof and oil-proof properties, and can completely replace foamed plastic products. Can effectively eliminate "white pollution.

Question: 4. is the thickness and weight of pulp molded products manufactured? Is there any relationship with strength?

With the existing technological level, the thickness of paper molded products is roughly between 1mm and 5mm, and the thickness of general products is mostly kept at about 2mm. Judging from the current quality and application of paper mold packaging products, its maximum load-bearing load can reach 200kg, its bearing shape is not too complicated, and the product lining packaging with a weight of less than 50kg is the best choice; the cushioning effect of paper mold packaging is mainly achieved by using its paper wall to be elastically deformed when it is impacted, thereby slowing down the offset external force. The elasticity of the paper mold material itself is not high, mainly depends on the product's support rib design and the formation of the buffer cavity, the design of the support rib plays a vital role in the elastic deformation of the paper mold packaging products, that is, the buffer capacity, and the basic basis of the design of the support rib is the shape and use of the product itself.

Question What are the special properties of 5. paper mold packaging products? 

1. Water resistance (moisture resistance) performance

2. Oil-proof (heat insulation) performance

3. Anti-static performance

4. Anti-radiation performance.

Paper molded products mold production is made of what material? How much is the production cost? Pulp products mold production of aluminum alloy material, the formation of paper molded products is produced by two sets of mold (suction mold, hot pressure mold); each set of mold manufacturing costs about 12000 yuan (to a template calculation).

Question 6. What is the basis for the quotation of paper mouldings? How does it compare with the cost of foam packaging? 

paper molded products quotation is based on:

1. The shape, structure, volume and weight of the product; Products below 50g are calculated as 50g.

2, the use of raw materials: the requirements of the manufacturing process;

4, product output level. Table of comparison of paper mold and foam packaging costs:

Specifications: paper mold = foam unit price (yuan/g): paper mold = foam

Weight: Paper mold> Foam 7

E:} Package volume: paper mold

Characteristics of 1. pulp molded products　

1. Environmental protection:

Pulp molded products are the use of waste newspapers, carton paper as the main raw materials, after a certain ratio of additives for pulping, through a special mold for dehydration molding, and then through drying, heat treatment, shaping and other series of processes. Pulp molded products can be used, biodegradable, after adding a special process, has a good waterproof, oil-proof performance, can completely replace the foamed plastic products, can effectively eliminate the "white pollution", products environmental protection is good. Pulp molded products are the world's environmental protection department recommend environmental protection products, in its production process of environmental protection work attaches great importance to the impact of its three wastes on environmental protection, in the whole production process, from the use of the main raw materials to the end of the whole production process, its environmental awareness is very strong. The raw material is waste paper, and in the production and processing process, it is mainly physical reaction, only a small amount of chemical products are added as waterproof agent, and these chemical materials are basically all retained in the finished product after the product is dried, and no environmental pollution is caused by discharge. The water used in the production line is closed and recycled, but water vapor is generated to volatilize into the space when the product is dried, and no supplementary water is needed in the production process, so the water consumption.

2. Cost economy:

After several years of development and innovation, the equipment performance has been continuously improved, the production process has gradually matured, and the production cost of the product has stabilized. At present, the production cost of domestic paper tray products has been basically the same as that of foam plastic products, and the cost of some paper tray products has been significantly lower than that of foam plastic products. Paper products instead of foam shock-proof products, in the use of performance, production costs are feasible, coupled with its environmental advantages, pulp molded products instead of foam products has become an inevitable trend.

Pulping Process of 2. Pulp Molded Products　

The use of raw pulp cardboard, waste paper, cartons, etc. as raw materials, through the pulp, refining and other processes, the paper into fiber, suspended in the water to form pulp. According to the characteristics of the required products, the fiber length and pulp concentration can be properly controlled to meet the needs of the products. Adding special additives to the pulp can make the product waterproof and oil-proof. Add the appropriate pigment, can make the product with a variety of colors.

Molding Process of 3. Pulp Molded Products　

At present, there are two categories of molding types of foreign pulp molding production equipment: vacuum molding and grouting molding.

1. Vacuum pulp forming method is the most popular method of paper and plastic products. According to its different structure, there are three ways: drum type, flip type, reciprocating lift type

Drum type: continuous rotation production, high production efficiency, large mold investment, high mold processing accuracy, high technical requirements for equipment processing accuracy, one set of concave mold with eight sets of convex mold, need to use CNC center processing mold, long processing cycle, large investment. Because it is continuous production, it is suitable for the production of large quantities of stereotyped products, such as plates, dinner plates, wine trays and egg trays. For industrial molding production due to non-standard, small quantity, batch, mold investment is not applicable.

Turning type: turning type production is lower than drum type production efficiency, suitable for industrial molding medium batch and non-standard production, but because it is a set of concave mold with two sets of convex mold, need to use numerical control center processing mold, mold investment is large, long cycle.

Round-trip lifting type: the production efficiency is lower than that of the drum type, and it is not much different from the round-trip type. it is a commonly used equipment at present. because the equipment only needs a set of concave dies and a set of convex dies, it does not need numerical control center processing, and is especially suitable for non-standard, small batch and fast cycle industrial packaging products (the production cycle of industrial packaging products is usually within 10 days).

2. Grouting method

Grouting molding method is based on different pulp packaging products, calculate the required amount of slurry (material) and quantitative injection molding cavity, adsorption molding. This molding method is suitable for standard products with little change and stereotypes. It is commonly used in tableware molding products. Because it is difficult to master the stereotypes calculation, this molding method is not used in non-standard paper-plastic packaging (industrial packaging).

Drying Process of 4. Pulp Molded Products　

Pulp products after pulping, molding, generally contain high moisture, need to go through the drying process. The drying process uses fuel (gas), electricity or steam, hot oil or other media as heat source to heat the air, and the molded pulp products are dried in hot air (180~220 ℃), and the water evaporated by the fan is extracted to achieve the effect of rapid drying.

Shaping Process of 5. Pulp Molded Products　　

After forming and drying, the pulp products are basically shaped, and then pressed with high temperature and high pressure to make their appearance neat and beautiful, achieve better toughness, and have better shockproof performance. The shaping process generally uses electric heating plate or other thermal media (such as heat transfer oil) to heat the heating plate, so that the pulp product mold has a higher temperature and achieves a rapid shaping effect.