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6.1. SDD 1 SGM
The SDD 1 SGM is a syn chro nized, dig i tal dos ing sys tem de signed to pre cisely dose plas tic ad di -
tives (ei ther in pel let or pow der form) on any plas tics pro cess ing ma chine, whether in jec tion mold -
ing, blow mold ing, or all ex tru sion ap pli ca tions.
The prcise dos ing of ad di tives is ac com plished us ing a cor rectly sized dos ing disc in com bi na tion
with a spe cial DC drive mo tor and our easy to op er ate con trol. This com bi na tion al lows for ad di -
tives to be dosed in synch with the pro cess ing ma chine and the flow of the main com po nent ma te -
rial. When the ad di tive and main ma te rial hit the pro cess ing screw, they will be mixed at ex actly
the right pro por tion, ac cord ing to your inputted rec ipe. The SDD 1 SGM con trol lers are connected
to the pro cess ma chine and mon i tor the screw re cov ery time for in jec tion, in jec tion blowmolding
and the screw speed of an ex trud er. Ster ling guar an tees de liv ery of a ho mo ge neous mix ev ery
time with out risk of de-mix ing even with the use of mi cro-batch (or mi cro pel lets).
Our de sign makes ma te rial change over al most ef fort less. Sim ply lift two quick dis con nects and
lift off the ad di tive sta tion. By the use of a spare sta tion, change over is im me di ate. If you elect not
to pur chase a spare sta tion, clean up and ma te rial change oc curs off the ma chine in min utes, re -
duc ing down time and risk of in jury. Ad di tive may also be au to mat i cally loaded by the use of one of
Ster ling’s hop per load ers.
The SDD 1 SGM is mounted di rectly in the throat of the pro cess ing ma chine. We have var i ous
sizes and adapt ers to ac com mo date ma chine sizes and hop per loader con fig u ra tions.
6.2. Con trol Unit S 150
The Ster ling S150 con trol ler is a mi cro pro ces sor based con trol ler to op er ate the SDD 1 SGM au -
to matic dos ing sta tion for in jec tion mold ing ap pli ca tions.
To con trol the vari able speed AC mo tors, we uti lize pulse width mod u la tion tech nol ogy. This tech -
nol ogy keeps the mo tor torque con stant over the en tire con trol range of op er a tion. The drive op -
er ates with a built-in quartz cy cle, dig i tal con trol cir cuit, di rectly tied into the im pulse speed trans -
mit ter in the dos ing mo tor. This holds the inputted mo tor speed at an ac cu racy level of 1 min ute. A
sturdy key pad al lows op er a tional in puts. Op er ating con di tions are dis played by sym bols.
The ad di tive is dosed syn chro nously to the main com po nent and plasticization time of the in jec -
tion mold ing ma chine. The dos ing mo tor speed is mon i tored con tin u ously and, if nec es sary, ad -
justed in a fully au to matic way.
176-1MS
SDD 1 SGM
Functio nal des crip ti on 6-2