News

QingDao Keshengda plastic machinery Co., Ltd is located in Jiaozhou city, Shandong province, which is professional manufacturer and exporter of plastic machinery, the main products include PE/PP/PVC wood plastic composite profile extrusion line, PPR cold/hot water supply pipe extrusion line, PE large diameter gas/water supply pipe extrusion line, center hollow winding pipe line, PVC transparent sheet extrusion line, and WPC sheet extrusion line, etc. The company always obeys the principle of [credit is the basis, quality is the life, innovation is the pursue , service is the main " , keeps the quality promise for customers, focuses on introducing and cultivating talent, cooperates with many science and research institutes, has strong technology power and perfect testing means, integrates advanced technology advantages and rigid equipments and has introduced many technologists with working experience in research and development and fabrication of plastics processing whole equipments, and understanding and experience accumulation in plastics process and plastics machinery design matching; all of these have ensured high quality and excellent performance of our fabrication of plastics machinery equipments.

The Working Principle of Extruder The extruder can turn solid plastic into a uniform melt through the heating, pressure and shear then the melt is conveyed to the next process. The melt includes mixing masterbatch and other additives, blending resin, and then smash in the production process. The finished melt must be homogeneous on the concentration and temperature. The pressure must be large enough to viscous polymer extrusion. Extruder completes all of the above process through the barrel with a spiral track and a screw. The plastic pellets through a hopper at one end of the barrel into the barrel, and then transmitted to the other end of the barrel by the screw. The thread depth of screw starts to decrease with the increase distance of the hopper to ensure sufficient pressure. External heating and the internal heat generated by friction in the plastic and the screw make plastic soften and melt. Different polymers and applications have various design requirements of the extruder. Many options are related with the outlet, upper feed port, etc. The extrusion machine is normally composed by at least three segments. The first paragraph is feeding zone near the hopper. This part can push the material into the extruder at a relatively steady rate, which will maintain relatively low temperature to avoid clogging of the feeding channel. The second part is divided into the compression zone which forms a melt and increases the pressure. The transition can be sudden or gradually (gentle) from the feed zone to the compression section. The last part is the metering zone close to the outlet of the extruder. The main function is to maintain uniform material from the outflow of the extruder. And the material should have a sufficient residence time to ensure the uniformity of the composition and temperature. Another important part is the drive mechanism of the extruder. And the drive mechanism controls the rotational speed of the screw which determines the output of the extruder. The required power is determined by the viscosity of the polymer (flow resistance) which depends on the temperature and the flow rate. (End)

The identification method and process of PVC plastic pipe production line The process of PVC plastic pipe production line: raw materials + additives the mixing loading material Forced Feeding conical twin-screw extruder extrusion mould the sizing sets spray vacuum calibration tank soak cooling water tank printing inker caterpillar tractor cutting machine pipe stacking frame testing and packaging PVC is widely used and produced by a growth rate of 4% in the worldwide, especially in Southeast Asia where they have pressing needs of infrastructure construction. PVC is the most suitable material in the three-dimensional surface film. And PVC can be divided into soft PVC and rigid PVC. Soft PVC is generally used for floors, ceilings and leather surface. The soft PVC is easily brittle and difficult to preserve because of oftener (which is the difference between soft PVC and rigid PVC, so its use has been limited. However Hard PVC has the good flexibility, easy to shape, not brittlement, non-toxic and non-polluting, preserved for a long time. Therefore the hard PVC has great application value. PVC is essentially a vacuum plastic film for the packaging of various types of panel surface, which is also known as the decorative film and coating film used in building materials, packaging, pharmaceutical and many other industries. Building materials industry accounts for the largest proportion, 60%, followed by packaging industry. How to distinguish the good or bad PVC pipe: 1, you look at the smoothness and whiteness on the surface firstly. 2, cast samples. The pipe is easy to break, which generally contains high calcium. Of course, it is suitable for me to meet you the price. 3, step on the edge of the pipe to see whether it is cracking elongation at break or not. (Generally go to trial and you have to keep good relationship with sellers. Otherwise they can not let you step on) 4, the weather is very troublesome. You can place pipes in the high temperature and highlight for a few days to see the changing rate on the surface surf, but it is a waste of time. (end )

Similarity and Differences in Parallel and Conical Twin screw Extruder Users are often confused with Parallel twin-screw extruder or conical twin-screw extruder, which is the better? The twin-screw extruder classification is following: The rotation direction of the twin-screw: same direction and different direction. The same direction extruder refers to two screw work in the same direction while different direction extruder refers to two screw work in opposite directions. Parallel to the axis line of the twin-screw: parallel axis line and intersecting axis line. The twin screw extruder is parallel axis line; the axis line the conical twin screw extruder is intersecting axis line. Parallel and conical twin-screw extruder in common: plastic conveyor mechanism forced forward, good mixture of plasticizing capacity and dehydration, the same adaptability of materials and plastic molding process. The difference of the parallel and conical twin-screw extruder 1, diameter: parallel twin-screw extruder with the same diameter; conical twin screw extruder with different diameters in the large end and the small end. 2, concentric distance: the same center distance in twin-screw extruder; conical twin-screw with the angle changing in the size of the center distance. 3, screw ratio (L/D): parallel double-screw (L/D) means ratio of the effective screw length and the screw cylindrical; conical twin-screw (L / D) means average ratio of the effective length of the screw and the large end and a small end diameter. From the above, we clearly see the most significant difference in parallel and conical twin screw extruder. Namely they have different geometry of the screw barrel which causes many various structure and performance owning their respective advantages.

Overlooking China`s Plastic machinery After making the first production line in 1950s, China`s plastic machinery manufacturing industry takes on the stable and rapid development especially since reform and opening up. Now plastic machinery industry have various ranges, owning a complete industry system with a large scale and specializing production lines. Meanwhile its main technical and economic indicators closes to or reaching the international advanced level. In additional, the products not only meet the domestic market demand basically, but also increase export capacity rapidly. From the analysis of the number of plastic machinery products, 55,000 units, 75,000 units were in 2000 and 2005 respectively; 10 million units were expected in 2010 where Injection molding machines account for about 35%, the extruders 25%, blow molding machines approximately 5%, 35% of the others. From the analysis of the market of plastic products, the domestic market capacity in China`s plastic machinery products grows at the average annual rate of 6%. With the development of the quality of our products and the increase of various plastic machinery products, the domestic and oversea market share will also increase. Therefore China`s total industry output value of plastic machinery products is expected to reach 16 million yuan in 2012. General equipments of plastics in China can meet domestic demand, the number of equipment exports increasing year by year. China`s plastic machinery exports are the fastest-growing period in the history at present.

Analyzing Development Trend of Plastic Machinery In recent years, plastic machinery industry is to upgrade the main line, adhering to independent innovation, saving energy and environmental protection, high-end development path, accelerating research cooperation. Now plastic machinery industry has been developed and produced a large number of highly efficient energy-saving products. For example, according to the article geometry and product size, the launched [servo energy-saving plastic injection molding machine" achieves energy -saving rate of 40% to 80% which reaches the international advanced level and is recognized and welcomed by the market. Let me introduce main three types of plastic machinery to you. First, the injection molding machine The great characteristic is to apply molten plastic injected into the mold. After cooled, it becomes product. The injection molding machine can product directly, it is also important equipment for injection stretch blow process. The injection molding machine control system features: adopting advanced computer control; Self-diagnosis fault function; directly inputting pressure, speed, time, trip, and temperature data; pressure the coupling oil line to save power; mold cooling water regulating means; high-precision electronic ruler stroke control accuracy of up to 0.1mm, etc. Second, Extruder The basic mechanism of screw is simple - a screw in the cylinder rotates and puts the plastic to move forward. Molten plastic is squeeze out by extruder under screw through a fixed shape extrusion then cut after water-cooling setting under the role of the tractor. Extruders are mainly used for the variety of the same cross-section of the products of continuous production, such as tubes, rods, different profiles, etc. and can also be used for plastic modification granulation. Third, the blow molding machine The blow is a common method for manufacturing hollow thermoplastic products; the blow can also combine with injection molding process and extrusion process which are capable of producing abundant products widely used in food, pharmaceutical and cosmetics industries. From a global perspective, three main categories of the plastic machinery is injection molding machine, extruder / extrusion lines and blow molding machines which account for more than 80% of the total output value in plastic machinery fields, International Mould & Metal & Plastic Industry Suppliers Association official Luo Baihui said. Therefore plastic machinery industry market has great potential.

HDPE hollowness wall winding pipe has been widely used for drainage projects now and replace cerement pipes. Actually the research and production of plastic pipe goes through a tortuous development process. The development of plastic pipes started with UPVC bellows as a large-caliber drainage pipe in the domestic. However, compared with winding pipes, UPVC bellows have properties of high investment, lower compressive strength and other disadvantages. Although the earliest winding pipe with strip overlap, it was bad in interface strength, influenced by terrain. HDPE (as raw materials) hollowness wall winding pipes has following advantages in recent years: 1, chemically stable, Anti-acid and anti-alkali, anti-sewage and chemical corrosion resistance, no rust. 2, impact. the pipe wall with "H" structure, good adaptability in any foundation. 3, anti-aging. pipe can withstand direct solar ray in storage and construction process. 4, wide range of temperature. no cracking and expansion leakage within -80 to 60 5, light weight. It only takes up 1/8 the weight of cement pipes without no large-scale construction equipment. 6 easy connection. Pipe can be connected firstly then pushed the construction sites which can reduce construction time and cost. 7, superior abrasion resistance. Longer service life (up to 50 years) than cement pipe and steel pipe. 8, large water volume. Smooth wall increasing by 40% water volume. 9, the low price of raw materials. low construction, management, maintenance costs , good environmental protection. HDPE with non-toxic is harmless to the land and can be used repeatedly, known as environmentally friendly green products. HDPE hollowness wall winding pipe production line adopts extrusion and winding pipe methods, connected by extrusion melt adhesive, and can produce a series of specifications from 200 to 3000 mm in diameter winding pipe. The experts said that the production line adopts advanced PLC computer control system and high efficiency extruder from foreign technology, composite nose, combined dual feed, spiral rotation molding, special molding process and pipe connection. Meanwhile its technical performance has reached the international advanced level, overcoming the drawbacks of traditional pipes causing groundwater pollution due to leakage.