Discussion on technological innovation of the hott

2022-08-18
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Discussion on technological innovation of gas in plastic processing

industrial gas can be used in many ways in the field of plastic processing. Firstly, they are used to manufacture foaming products in injection molding, extrusion and polyurethane technology. Secondly, they are used as cooling medium and replacement medium in injection molding technology. The results are also different: the most important advantages are weight reduction, cycle time reduction, material consumption reduction and quality improvement. In the production of foam, the use of industrial gas can produce lighter foam, which is more environmentally friendly. This paper discusses the existing innovative technology

gas injection technology

by injecting nitrogen into the injection mold under high pressure, plastic parts with hollow sections or grooves are produced, which are only partially filled with melt. This has produced a lot of advantages: the basic is to improve product quality, reduce the weight of plastic parts, save raw material costs, and shorten cycle time. The correct transmission of high-pressure nitrogen can really reduce the cost of processors. The desy 300/100 compression system shown in Figure 1 compresses liquid nitrogen to 300bar. The main advantage of the system is that the energy demand is extremely low, and the gas impact value displays the maximum value and locks up. It is absolutely pure and completely oil-free

internal cooling gas injection technology

the new internal cooling technology developed by Linde company can improve the efficiency and quality of tubular plastic containing airway, such as various types of handles. Internal cooling uses high-pressure nitrogen available to users. The controlled flow of nitrogen through the existing airway dissipates heat from the inside

increasing the normal consumption of nitrogen from 100% to 300% can shorten the cycle time by 30%. Incidental functions include better dimensional accuracy and a smoother internal surface of the hollow space (Figure 2)

spot cooling of CO2 in injection mold

cooling of long, thin core layer, or places that can't be reached in the injection mold will cause problems in application. In addition to traditional water cooling, spot cooling of these hot areas with CO2 is also implemented, and only in these places in the mold, no other type of cooling can be effectively applied. CO2 point cooling was developed by Linde and isk. It transports liquid CO2 from the soft capillary to the action position at a pressure of about 60bar. The CO2 at the pipe end expands, producing a very high basic local cooling effect. As a result, the cooling time is actually shortened, and the cycle time is shortened by more than half

microcellular foaming

in the microcellular foaming of injection molded parts, the foaming agent is CO2 or nitrogen. The compactor can start gas during the operation of environmental experimental equipment. The foaming part has a porous inner core and a dense outer surface layer. Fine bubbles and uniform cellular structures produce mechanical properties superior to those of traditional foam

the main advantages are that the plastic parts are lighter, the material consumption is reduced by about 30%, the deformation is small, and the shrinkage marks are avoided

extrusion foaming

using physical foaming agent to produce extruded foamed plastics will generally increase the foaming degree, that is, reduce the density (Fig. 4). Products can be widely used in packaging, construction, automotive, electrical and other fields, such as PS material insulation board and PE material cable insulation layer

co2 and nitrogen under certain conditions are environmentally friendly and cheap foam blowing agents. The key to the successful utilization of CO2 lies in whether several important process parameters are observed

dsd500 high pressure measuring device is specially developed for CO2, which is particularly difficult to operate. It can accurately measure CO2 in the extruder or nitrogen in the company under variable melting high pressure (Fig. 5)

polyurethane foaming

co2 is a substitute for continuous and discontinuous production methods of low-density polyurethane (PU) foam. In the continuous thick plate method, liquid CO2 is added at a constant rate under high pressure. In the discontinuous method, CO2 is injected in different ways. Liquid CO2 needs to be measured and added with good accuracy. The high-pressure transmission system and metering device developed by Linde in close cooperation with industrial partners are extremely efficient and meet the latest technical needs

the high-pressure transmission system and metering device developed by Linde company in close cooperation with industry partners have high benefits and can meet the latest technical requirements

co2 compression pump can also be used in PU foam and extrusion foaming. A wide variety of pump systems ensure that CO2 is delivered without foaming at the required flow rate and pressure

industrial gases such as nitrogen and carbon dioxide have various applications in injection molding, extrusion and polyurethane technology. Applications range from foaming, cooling to material replacement

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