parison


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parison

(ˈpærɪsən)
n
(Ceramics) an unshaped mass of glass before it is moulded into its final form
[C19: from French paraison, from parer to prepare]
References in classic literature ?
Whereas, I in com- parison, felt myself a mere bird of passage in that port.
This appeared to him so awfully mysterious, and impressed him so immensely, that what he saw and heard after he got on deck were mere trifles in com- parison.
The hot parison is then inflated with compressed air and forced against the interior walls of the mold cavity, which sets all of the exterior part dimensions, surface texture and printing.
Tip 2: Allow setup personnel time to properly adjust parison length when warranted, and have them tighten up thick sections in the extrusion program.
As illustrated in Figure 1, the blow molding process consists of four main phases: parison extrusion, inflation, part solidification and mold release.
A low cost parison control system is being sold by Eurotherm in the USA as an upgrade on existing machinery and as a replacement package for outdated Moog, Hunkar, and other systems.
In the extrusion blow molding process, the first step in the molding cycle is the parison formation.
The parison is usually extruded directly into the cavity of a blow mold where it is then internally pressurized by air at about 60 psi; this pressurization inflates the parison and forces its outer surface against the blow mold cavity.
Air must rapidly inflate the parison upon mold closing.
Product cooling time strongly dictates the cycle time in EBM, and minimizing the extrudate temperature (just enough to get the parison to form properly) will minimize the cooling time and the load on the cooling system.
The parison is captured on both ends, between the preceding mould and the head, and so is always the same length.
The blow molding process consists of four stages: parison extrusion, mold clamping, parison inflation, and part solidification.