Compression Technology for plastic closures - Sacmi
Compression Technology for plastic closures - Sacmi
Compression Technology for plastic closures - Sacmi
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
Why <strong>Compression</strong> Moulding is better than Injection?<br />
EN<br />
SHORTER CYCLE time and there<strong>for</strong>e higher<br />
productivity. The lower extrusion temperature allows<br />
the cap to be cooled in the mould more quickly: this<br />
has shortened cycle times, which have, in the case of<br />
lightweight caps, been cut to around 2 seconds.<br />
LESS ENERGY CONSUMPTION. Lower extrusion<br />
temperatures mean less energy is needed to bring the<br />
<strong>plastic</strong> to extrusion temperature and, since the <strong>plastic</strong><br />
is colder, less energy to cool it is needed. Overall<br />
energy savings per cap produced can be as high as<br />
45%.<br />
HIGH SPECIFIC DENSITY. Moulding pressure being<br />
equal, lower temperatures allow attainment of a higher<br />
specific density; moreover, the injection point, which<br />
puts added strain on the molten <strong>plastic</strong>, is absent. This<br />
technological condition provides mechanical properties<br />
and a consistency that would be unattainable with<br />
injection.<br />
Q [t°]<br />
Q [170° C]<br />
Q [30° C]<br />
CONSISTENCY has become a major issue in the<br />
beverage bottling where production lines are ever<br />
faster and more sophisticated and where cap-related<br />
plant stoppages can no longer be tolerated.<br />
MAINTENANCE-FREE MOLDS that last decades.<br />
The vertical and axial movement of the compression<br />
mould ensures - unlike the injection mould, burdened<br />
by its own weight - the moulds are protected from all<br />
kinds of wear. <strong>Compression</strong> moulding allows to its<br />
moulds no wear <strong>for</strong> their entire working lives.<br />
QUICK COLOR CHANGEOVERS. These can be<br />
completed quickly without having to clean a hot<br />
chamber, which is absent in the compression process.<br />
LESS WASTE = lower costs.