preform


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preform

[prē′fȯrm]
(engineering)
A preshaped fibrous reinforcement.
A compact mass of premixed plastic material that has been prepared for convenient handling and control of uniformity during the mold loading process.
(engineering acoustics)
The small slab of record stock material that is loaded into a press to be formed into a disk recording. Also known as biscuit (deprecated usage).
References in periodicals archive ?
- Global optical fiber preform market (supply & demand, regional distribution, price, competitive pattern, and development trend)
In one-step injection stretch-blow molding (ISBM), injection and cooling of the preforms in the first station of the machine always requires the longest time and therefore determines the overall cycle time, according to Nissei ASB.
SGT has been a specialist for more than 30 years in the production of preforms in PET and of bottlenecks and caps in HDPE.
31 August 2017 - Las Vegas, US-based optical fiber technology company Ameritek VentureS (OTC: ATVK) has agreed to an asset purchase with the chairman and CEO of Ameritek to acquire intellectual property needed to manufacture new optical fibre preforms, the company said.
JP Grosfilley SAS of Martignat, France, showed a three-station, rotary injection blow mold for bottles that molds preforms in the first station; blows them in the second; and ejects them freefalling in the third.
The 1.5-Step PF moulding process is based on the principle that it takes around three times longer to injection mould and cool a preform than it does to blow the bottle.
The 22.3g preform is designed for lightweight 750m1 bottles and is the best when it comes to material economy.
The present work aims to elucidate the effects of preform reheat temperature on the 1.5-1 CSD bottle properties in a two-stage ISBM process.
Manufacturer of PET preforms, APPE, has invested [euro]1.5m to develop and install SampJe-PreWatcher technology from Intravis GmbH for the automatic inspection of the key quality parameters of preforms.
Because preform size has an impact on the ratio of fiber cost to processing cost, the relative costs to manufacture short-fiber preforms were estimated for small, medium and large preforms.
A variable speed cutter is located in the head of the machine, and the extrudate is cut at the die face so variations in die swell do not affect the volumetric accuracy of the preforms.
The bottles are produced in two steps--the first operation is the injection molding of the preform, second is blow molding the preform into the final shape.