Low-pressure structure is epispastic Injection Molding technology

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Use occasionally nitrogen amine of 2 armour acyl (Azodicarbonamide) epispastic photograph of as auxiliary as gas technology is united in wedlock, in the product that the unit weight intensity that applies extensively at acoustics date canister to wait for pair of products and acoustic quality effect have individual demand. Article key introduces low-pressure structure of epispastic craft shape characteristic, and common flaw and eliminate a method. Shape as high polymer the development of engineering technology, the structure is epispastic note model and gas to assist note model two shape craft is added more perfect, applied domain expands ceaselessly. But, as people living standard rise with each passing day, raised taller requirement to a lot of products, in domain of acoustics date canister for instance everybody pays close attention to effect of the durable sex of acoustic quality effect and product, exterior to wait a moment more and more. Note model traditionally to had satisfied these model very hard demand, low-pressure structure is epispastic the birth that notes model fill the blank of the traditional technique that note model. Brief introduction of the epispastic development that note model is epispastic the technical origin that notes model is ages ago. The earliest it is 20 centuries the bubble bakelite of 20 time initial stage, use the honest legal system of similar production cellular rubber to take; Foam of polyurethane of 30 time occurrence horniness and polystyrene bubble; 40 time have bubble of polyethylene, pvc, epoxy resin, phenolic aldehyde; 50 time have can send a gender polystyrene bubble and foam of soft qualitative polyurethane. Now, basically all plastic, include thermoplastic with hot solid sex OK and epispastic. The preparation method on industry has: Crowded bubble setting out, note model moulding is epispastic, epispastic, pressure delayed action bubble, powder is epispastic with spray epispastic etc. Among them, note model epispastic it is the most important shape one of methods, also be low-pressure structure epispastic the predecessor that notes model. Epispastic principle is in low-pressure structure plastic before having injection, infiltrate low-pressure gas restrains foaming agent instant inside the modular antrum that through nitrogen auxiliary equipment Xiang Mi seals epispastic, achieve when pressure 0.

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Begin to shoot glue stuff mould when 0MPa, at the same time the nitrogen inside the mould passes steam vent slow eduction, and foaming agent is in plastic interior is epispastic form small hole. Epispastic reaction type: C2H4N2O2+N2N of C2H4N4O2 　 　 .

+ N.

=N2 name: Occasionally nitrogen amine of 2 armour acyl; Structural formula: C2H4N4O2; Molecular quantity: 116. Content changes character: Flaxen crystallization is pulverous, below normal circumstance very stable; Avirulent, without sex of smelly, free from contamination; Easy dissolve Yu Erjia base inferior amine of vitriol, 2 methylic acyl and solution of hydrogenous oxidation natrium; Not dissolve is mixed at acerbity, mellow, ketone, benzene, benzine water. The characteristic structure with epispastic structure is epispastic (Structural Foam Molding) belongs to chemical foaming, withheld traditional inject to shape a lot of advantages of craft, avoided latter partial flaw again, like product strength too long, moulding leads cycle of insufficient, production low. Use a structure epispastic technology is OK moulding is large and complex goods, use antrum of low cost mould, much model to be able to be operated at the same time, reduce goods to produce cost thereby. Structure epispastic goods is have compact surface layer one kind join system epispastic material, intensity of its unit weight and stiffness are compared akin not epispastic stuff is expensive 3 ～ 4 times. Low pressure of NtentText Onmousedown=PopRightsMsg(); Align=center>ntentText Onmousedown=PopRightsMsg();> is epispastic note model and common the modular antrum pressure that the distinction that notes model has in Yu Jimo is inferior, make an appointment with 2 ～ 7MPa, and common note model to be between 30 ～ 60MPa. Low pressure is epispastic note model to be used commonly owe note a way, be about to measure certainly (not flood model antrum) plastic fuse-element (contain foaming agent) infuse model antrum, foaming agent decomposes the gas that come out to make plastic expand and fill modular cavity. In common low pressure has on the machine that note model epispastic note model, it is will chemical commonly foaming agent and plastic mix, inside machine canister model is changed, must use from the lock type shoots the mouth. When inject, as a result of gas diffuse rate is very rapid, the appearance that can create product is coarse, because this fixes the inject rate of model machine,want enough fast. Use supercharger to raise inject speed and shot commonly, make inject movement is finished in the instant. Technological process (1) the data that uses us normally if: ABS, HIPS, PP (the attention must be to shape what epispastic temperature approachs temperature and AC foaming agent is plastic) , it is certain to undertake with AC proportional mix, normally scale is 0.

5%-5% . (2) mix even material to be mixed in all through noting model machine screw, right now the valve of nozzle is shut. (3) auxiliary equipment carry turns to gas infiltrate inside sealed mould low-pressure nitrogen, restrain foaming agent to be in the instant is epispastic. (4) achieve when modular antrum pressure 0.

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When 0MPA, open from valve of the nozzle that lock up type begin injection, melt is plastic heat through what the thermal current inside the mould, let foaming agent reach epispastic temperature. (5) plastic be about to when cram model antrum (control in 90%-95% normally) , gas assists equipment to begin exhaust, meanwhile plastic an interior is sufficient also undertake epispastic, add accent of full whole pattern finally. Common flaw and settle way (1) note model shrink: As a result of fill regular meeting of too saturated classics is caused epispastic inadequate, cause veins that stand out under the skin consequently with column shrink. Means of settlement: Reduce shot, reduce the time that pour vital energy, reduce the pressure that pour vital energy, raise nozzle temperature. (2) note model owe note: Because pour model amount,insufficient classics regular meeting has owe note a phenomenon. Means of settlement: Increase the amount that note model appropriately. (3) mark of fuse-element burst, gas: Because fill up inhomogenous epispastic perhaps opportunity is incorrect, noting model the surface can have blemish of tangerine skin condition to perhaps have the drawback that is similar to frit lapping defect. Means of settlement: Adjust note model fill up evenly, lower rate of runner position fill appropriately, reduce aeriform pressure, the slope that raises gas to discharge appropriately, drop makings canal temperature, avoid material to shift to an earlier date in makings canal epispastic. Other blemish handle method and tradition to note model to be close to quite, repeat a specification no longer here. Basically be the pressure that assists equipment to adjust mould interior through gas, control the opportunity with epispastic vesicant then. Conclusion (1) low pressure is epispastic noting model is assist the new-style technology noting model with control AC epispastic vesicant by gas. (2) low pressure is epispastic the large wall that notes model to be able to solve a tradition, column, muscle shrink problem, still have economic data at the same time, improve the function such as effect of product acoustic quality, apply extensively at each industries in. CNC Milling CNC Machining