Injection molding Compounder technology is the combination of the twin screw extrusion and plunger type of injection molding operations. The machine configuration is such a way that, continuous fiber roving fed in to the last zone of extrusion section, due to this actually it possible to achieve the longer glass fiber at the component level. Eventually longer fiber length at component level is possible using IMC than by using LFT graduals available in market.
As the process is combined process of continuous and non-continuous process the buffer pot facilities to store the melt during batch process of injection molding. Feeding of continuous roving in last zone of extrusion barrel, pot type of injection molding operation all help to process the glass contained melt with minimum crushing of glass. Important is to design the mold with bit larger size of runner, gate system and less number of sharp cornered flow path which facilitate melt to carry fibers of longer length to mold cavity.
Influence of fiber length on mechanical properties:
As the length of the fiber in plastic melt increases the mechanical properties like stiffness, strength and impact of the material increases. With around 1 mm glass length the stiffness of thermoplastic material increases up to 95 % level, at the same length of glass fiber the strength reaches to around 35% level and impact about 1.4 %. Whereas when glass fiber length in melt reaches 10 mm to 40 mm it is possible achieve best and up to 95 % level of stiffness, strength and impact properties of thermoplastic material.
Where better strength to weight ratio, better impact properties are desired from product, the IMC is one of the ideal technology to utilize. Also IMC is one of the best technologies to convert metal structural part to plastic structural parts. Worldwide there are various automotive and non-automotive products are being manufactured using IMC technology.