THE FEASIBLE STEMWARE PRODUCTION PROCESSES ARE:
A – Bowl on Stem process
The line is composed by a Press machine, producing the Stems, and by a Blowing machine, to blow the Bowls on the Stems themselves, obtaining the ﬁnished Stemware. This process allows the production of medium high quality stemware, either in lead crystal, barium or sodalime glass, with thin-walled bowls (min. 0.7 mm) and good sealing point.
This line has a typical production speed of 30-35 ﬁnished stemware per minute or 45-50 for high-speed lines.
B – Stem on Bowl process
The line is composed by a Press and Blow or a Blow Blow machine producing the bowls, and a special Press machine, working in double gob operation, which loads the bowls on its table and press the stem on each bowl. These are high speed lines, that allows the production of medium quality stemware, mainly in sodalime or barium glass.
This line has a min – max production speed of 30 – 70 fi nished stemware per minute
The stemware produced by this process are typically in sodalime glass and are intended for markets such as HORECA or Large Retailers.
This process can be also used to produce articles with shaped or colored stems, pressed on flint bowls.
C – “One-pieces” stretching process
This process allows the production of finished stemware at high speed but with a limitation in the variety of final shapes, just using one forming machine , one stretching machine and one burn-off machine ( so only one forehearth) . This is a medium/high speed line, that allows the production of medium quality stemware mainly in sodalime glass.
Olivotto Glass Technologies has also developed an innovative combo machine ( Stretching/Burn-off) for this process in substitution of stretching and burn-off machines with the main goal of improving the final quality of the stretched wares and increasing the total line efficiency (reducing the number of ware transfers from three to two machines).
This line has a typical production speed that can vary from 30 to 75 finished stretched stemware per minute
D – Welding and welding / stretching processes
This process allows the production of higher quality stemware, in Lead Crystal, Barium and even in Sodalime glass. Are composed by a bowl forming machine producing the bowls (a O.90 press & blow or a E series blow & blow machine), a press machine for the stem production and a Welding or Welding/Stretching machine, with 60 or 48 sections, for the welding of the stem to the bowl and, if necessary, the final stretching operation in order to obtain long neck stemware and “flûtes”.
This line has a typical production speed of 40 or 60 finished stemware per minute
The stemware produced by this process are typically in Cristaline glass and, because of the wares high quality and their special shapes, are intended for high-end markets.