Ultra-high-molecular-weight polyethylene UHMWPE usually refers to linear polyethylene having a viscosity average molecular weight of more than 1.5 million. The overall performance is very good. The main performance is: high wear resistance, high impact resistance, self-lubrication, impact energy absorption, High chemical stability, high anti-adhesion, etc., have been recognized as "amazing plastics" abroad. However, due to the extremely high viscosity of the resin, the critical shear rate is very low, and the melt exhibits high-elasticity characteristics, which cannot be processed at all with conventional plastic molding processing methods and conventional equipment. For a long time, the intermittent press sintering and reciprocating plunger extrusion products limited by the low production efficiency had low efficiency, high energy consumption and a single product type, making U HMWPE raw materials produced in China have to be exported at a low price. Improving the level of its processing technology and making it more widely used has always been a difficult problem for countries in the chemical industry in the world.
This project is aimed at the characteristics of U HMWPE materials, through the special design of processing equipment, and at the same time modifying the U HMWPE material, so that it can not only have a certain degree of processing, but also maintain its original excellent performance. The technology of this project The key is: 1. The relative molecular mass and distribution range of U HMWPE materials are improved to improve their melting characteristics and processability. At the same time, the excellent characteristics of U HMWPE itself cannot be reduced, and the raw material cost is not greatly increased. Based on this, a special formula for U HMWPE single screw continuous extrusion has been developed. After testing, U HMW - PE extrusion products and the original resin of the mechanical properties of the basic indicators; 2. According to the molding characteristics of U HMWPE raw materials, a dedicated single screw extrusion system was designed, including a forced feeding system, a large thrust anti-lock shaft screw system, an efficient cooling system, and a stereotype system, which successfully achieved continuous, stable, and efficient extrusion production. Can produce traditional processing methods can not produce the pipe, bar products; 3. Through the experiments and theoretical calculation of the head, a special pipe mould with special structure was designed to solve the problem that the material adhered to the mold surface, and the slip flow state could be well formed in the mold. Due to the combination of equipment and processing technology, the requirements for flow modification in the formulation are reduced, not only the raw material components are inexpensive, but also they can be directly extruded without special granulation of raw materials, so that excellent appearance and intrinsic performance can be obtained. The natural pipe products.
The technology developed in this project has been granted national utility model patents and invention patents. Its production technology and production equipment passed the ministerial appraisal hosted by China Petroleum & Chemical Corporation in January 2001 at the pipe manufacturer. Experts agreed that the equipment is characterized by continuous, uniform, high-efficiency, stability, and high degree of automation. Its technology is mature and has independent intellectual property rights. The main technical performance of the equipment has reached the advanced level of similar international technologies, filling the gap in the domestic high-molecular-weight polyethylene pipe efficient continuous production technology.
After the research and development of this project was completed, it not only solved the key technical problems of the efficient and continuous molding of the resin, but also promoted the wide application of this high-performance engineering plastic. The existing press-sintering production of U HMWPE sheet and plunger extrusion production of bar, pipe products, due to low production efficiency, China's annual consumption of U HMWPE raw materials is only 2,000 to 3,000 tons, the extrusion technology studied in this project, a single production line The output reached 200 to 1,000 tons. According to the current market prices of industrial application pipelines, U HMWPE raw material market prices and the price level of imported similar pipeline products, the sales price of U HMWPE pipes is expected to be around RMB 40,000/ton. The project will be put into production with an annual output of 1,000 tons of pipe materials, which can achieve The output value is 40 million yuan and the profit exceeds 20 million yuan. According to the current situation of ordinary high-density polyethylene large-diameter pipes, U HMWPE large-diameter pipes have a certain degree of competitiveness, export 500 tons per year, the export price of 10,000 US dollars / ton, you can achieve annual foreign exchange of 5 million US dollars. The price of U HMWPE pipes imported from foreign countries is as high as 40,000 to 50,000 U.S. dollars. Due to the great advantages of domestic U HMWPE pipe prices, it can reduce the burden on domestic companies and save a lot of foreign exchange. Therefore, the product has high economic benefits.
This project is aimed at the characteristics of U HMWPE materials, through the special design of processing equipment, and at the same time modifying the U HMWPE material, so that it can not only have a certain degree of processing, but also maintain its original excellent performance. The technology of this project The key is: 1. The relative molecular mass and distribution range of U HMWPE materials are improved to improve their melting characteristics and processability. At the same time, the excellent characteristics of U HMWPE itself cannot be reduced, and the raw material cost is not greatly increased. Based on this, a special formula for U HMWPE single screw continuous extrusion has been developed. After testing, U HMW - PE extrusion products and the original resin of the mechanical properties of the basic indicators; 2. According to the molding characteristics of U HMWPE raw materials, a dedicated single screw extrusion system was designed, including a forced feeding system, a large thrust anti-lock shaft screw system, an efficient cooling system, and a stereotype system, which successfully achieved continuous, stable, and efficient extrusion production. Can produce traditional processing methods can not produce the pipe, bar products; 3. Through the experiments and theoretical calculation of the head, a special pipe mould with special structure was designed to solve the problem that the material adhered to the mold surface, and the slip flow state could be well formed in the mold. Due to the combination of equipment and processing technology, the requirements for flow modification in the formulation are reduced, not only the raw material components are inexpensive, but also they can be directly extruded without special granulation of raw materials, so that excellent appearance and intrinsic performance can be obtained. The natural pipe products.
The technology developed in this project has been granted national utility model patents and invention patents. Its production technology and production equipment passed the ministerial appraisal hosted by China Petroleum & Chemical Corporation in January 2001 at the pipe manufacturer. Experts agreed that the equipment is characterized by continuous, uniform, high-efficiency, stability, and high degree of automation. Its technology is mature and has independent intellectual property rights. The main technical performance of the equipment has reached the advanced level of similar international technologies, filling the gap in the domestic high-molecular-weight polyethylene pipe efficient continuous production technology.
After the research and development of this project was completed, it not only solved the key technical problems of the efficient and continuous molding of the resin, but also promoted the wide application of this high-performance engineering plastic. The existing press-sintering production of U HMWPE sheet and plunger extrusion production of bar, pipe products, due to low production efficiency, China's annual consumption of U HMWPE raw materials is only 2,000 to 3,000 tons, the extrusion technology studied in this project, a single production line The output reached 200 to 1,000 tons. According to the current market prices of industrial application pipelines, U HMWPE raw material market prices and the price level of imported similar pipeline products, the sales price of U HMWPE pipes is expected to be around RMB 40,000/ton. The project will be put into production with an annual output of 1,000 tons of pipe materials, which can achieve The output value is 40 million yuan and the profit exceeds 20 million yuan. According to the current situation of ordinary high-density polyethylene large-diameter pipes, U HMWPE large-diameter pipes have a certain degree of competitiveness, export 500 tons per year, the export price of 10,000 US dollars / ton, you can achieve annual foreign exchange of 5 million US dollars. The price of U HMWPE pipes imported from foreign countries is as high as 40,000 to 50,000 U.S. dollars. Due to the great advantages of domestic U HMWPE pipe prices, it can reduce the burden on domestic companies and save a lot of foreign exchange. Therefore, the product has high economic benefits.
There are mainly four different designs in paper bags, firstly is normal design without handle that made with kraft paper, secondly is the normal design same as the first one but with handle, mainly paper twisted rope, thirdly is the normal construction design with PP rope. And the last one is Japanese folding Paper Shopping Bag, it has different construction than the normal design and it is hand-made.
Below is the normal design Paper Bag that with no handle. It is the simplest paper bag that used in food industry.
Below normal paper bag is almost the same as above paper bag, both of them are made by machine. But this kind of paper bag glued with paper twisted rope for handle.
Below paper shopping bag is more luxury than above two kinds. It is made with artpaper and PP rope as handle. But all of them have same constructions.
The last paper shopping bag is quite different from the normal ones comparing to their constructions. It is called Japanese folding gift bag and it looks more luxury as there is no folding lines one front side and back side on the paper bags.
Paper Bag
Paper Bag,Paper Gift Bags,Small Paper Bag,Paper Shopping Bag
Dongguan Ibis Industry Co., Ltd , http://www.ibispackaging.com