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 ?
Due to technological limitation, over 70% of China's demand for optical fiber preform was imported prior to 2010.
PET converter Esterform Packaging has introduced short neck 28mm 1881 PCO neck preforms for soft drinks and water in bottles from 250m1 to 2 litres.
The present work aims to elucidate the effects of preform reheat temperature on the 1.
5m to develop and install SampJe-PreWatcher technology from Intravis GmbH for the automatic inspection of the key quality parameters of preforms.
Reduced flash and improved flow are said to be provided by preforms that are profiled to better fit the mold cavity.
The combination of the preform and molding processes mean that a preform can be produced in a matter of hours, and a composite part can be completed in a matter of days.
As a kind of raw material for optical fiber production, optical fiber preform features manufacturers are primarily concentrated in Japan, Europe and America, while other countries rely upon importing optical fiber preform to produce optical fiber and cable.
Complete report on optical fiber preform market spread across 97 pages, profiling 13 companies and supported with 128 charts is now available at http://www.
Whereas just a short while ago, a preform with a length-to-wall thickness ratio (Lit) of much more than 50 was virtually unthinkable, SIPA's Xtreme technology makes an L/t ratio of 80 a reality.
The ProShape module adds orientation and selective temperature control of the preforms to the standard Contiform operation.
But if the cycle time is too short, the preform can actually heat up again after it has been cooled, owing to the residual heat in its walls.