reazzjoni Injezzjoni

X'inhu RIM

RIM huwa mod ġdid proċess għall-produzzjoni daqs kbir u prodotti kwantità enormi malajr. proċess RIM hija monomeru jew pre-polimeru (materjali PU) fi stat likwidu bi proporzjon ċerta li jitkejlu mill-pompa taħlit kejl fil taħlit kap ta 'moffa. Wara t-taħlita tiġi injettat fil-moffa taħt f'ambjent b'livell baxx temperatura tal-pressjoni / kamra, tibqa rispons rapidu u cross-linking tqaddid. Wara għaxar minuti aktar, se jkun solidifikat, u mbagħad tirrilaxxa mis-moffa, dik il-parti hija prodott RIM. Dan il-proċess jista 'jiġi ssimplifikat bħala: ħażna, il-kejl, ibridi, moffa mili u tqaddid, demould u post-ipproċessar.

Il-proċess ta 'molding injezzjoni Reazzjoni

1) Ħażna
Żewġ materjal likwidu prima użata fil-proċess RIM kienu maħżuna fi tnejn ġibjun f'ċerti f'temperaturi, ġibjun huwa komunement tank taħt pressjoni. Fil-iffurmar, stoste normalment fi 0.2 ~ 0.3 MPa pressjoni baxxa fil-ġibjun, u jiċċirkolaw kontinwament fil-ġibjun, skambjaturi tas-sħana u t-taħlit ras. Fir-rigward tal-polyurethane, it-temperatura medja ta 'stoste hija 20 ~ 40 ℃, il-preċiżjoni kontroll tat-temperatura hija ± 1 ℃.
2)Measurement
Measurement will be finished by the metering pump , and requirements for measuring accuracy is at least be ± 1.5%, and the best control should at ± 1%.
3) Hybrid
In RIM process , product quality is largely depend on the quality of mixture in the mixing head , so does the production capacity . The normal pressure is about 10 Mpa in order to get the better effect .
4) Mold falling
The characteristic of RIM process is the material flow rate is very high .Then stoste’s viscosity can not be very high .Such as the viscosity of polyurethane mixture is about 0.1 Pa s.and flow rate control at 600 g/s in mold falling .
5) Curing.
Polyurethane two-component mixture have very high reactivity after injected in the mold ,so it complete curing in ten more minutes .But plastic’s conductivity is not good , so most heat can not release from a large chemical reaction condition , so that the outside temperature are higher than inside, so the curing development is from inside to outside .
6) Demold 
Demold also means we need release the cured part from the mold , and that part is the RIM product . And more quantity can be produced as the above process .
7) Post-Process 
It is according to customers’requirements . 

Materjal għall RIM

Raża ġenerali komuni: raża tal-polyurethane, ester tal-vinil, amide reżina ester, reżina mhux saturati, reżina epoxy u materjal kompost tradizzjonali, eċċ 
materjal Normalment: HD-PU4210, DCP-RIM, AXSON-RIM 875, eċċ.

PS: Il-ħin fejqan ta 'proċess RIM huwa prinċipalment mid-deċiżjoni formulazzjoni materjal iffurmar u d-daqs tal-prodott. Barra minn hekk, il-prodotti RIM bżonn għaddej it-tieni vulkanizzar wara l-ħelsien mill-moffa. U kif il-proċess RIM huwa mgħaġġel (15-30 minuti / biċċa) u ta 'preċiżjoni għolja, huwa xieraq li tipproduċi kwantità kbira u prodotti ta' daqs enormi, u d-daqs ta 'parti ikkastjar akbar huwa 2000mmX1200mmX1000mm, għal 10kg.

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