Online Google Dictionary

preform 中文解釋 wordnet sense Collocation Usage Collins Definition
Verb
/ˈprēˈfôrm/,
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preformed, past participle; preforms, 3rd person singular present; preforming, present participle; preformed, past tense;
  1. Form (something) beforehand
    • - a preformed pool
  1. form into a shape resembling the final, desired one
  2. form or shape beforehand or determine the shape of beforehand
  3. A preform is material that has undergone preliminary shaping but is not yet in its final form.
  4. (preforming) (1) The initial pressing of a metal powder to form a compact that is to be subjected to a subsequent pressing operation other than coining or sizing. (2) Preliminary forming operations, especially for impression-die forging.
  5. (Preforms) A tamper evident band that is opened and formed. It is ready to be placed on top of a container. It is not flat & has a preformed lip that lays over the shape of the container (usually a lid).
  6. (Preforms) Term referring to the medium used to attach 2 materials together – examples of performs: glass, ceramic, copper, copper silver-BT, Au/SN, Au/GE, Sn/Pb, and many others.
  7. (1) The forging operation in which stock is preformed or shaped to a predetermined size and contour prior to subsequent die forging operations. ...
  8. the compressed cylinder of PTFE resin that is used to extrude into raw tubing. Also called a billet.
  9. Used in Blow Molding processes. Heat-softened polymer is formed into a shape similar to a thick test tube with neck threads. This tube is subsequently inflated while inside a Blow Mold to create the shape of the desired article.
  10. The glass rod from which optical fiber is drawn.
  11. The starting form of glass or silica that is used to generate fiber or capillary by heating and drawing to produce the final smaller product size.
  12. an early preliminary stage in the reduction-manufacture of a flaked stone artifact.
  13. A plastic test tube shaped part produced by injection molding systems in the first step of a two-stage injection molding and blow molding process used to produce PET bottles or containers. ...
  14. Brazing filler metal fabricated in a shape or form for a specific application.
  15. An assembly of dry fabric and/or fibers which has been prepared for a matrix addition process. A preform is usually stitched or otherwise stabilized in some way to maintain its shape before final processing.
  16. The preshaped, uncured material placed in a mold for vulcanization. Preshaping is done to facilitate mold flow, control weight accuracy, etc.
  17. Injection moulded test-tube-like component which is re-heated and blown into a PET bottle.
  18. A micro container resemble a wide test-tube, made of transparent plastic (usually clear but sometimes tinted), with a screw-on cap. Preforms are actually the “blanks” which are heated and blown into a form to create soda bottles. ...
  19. a stone that has a shape cut into it before it is polished. This gives some control over the final outcome, for instance, a stone can be cut into a rough tear drop shape and then polished to perfection.
  20. A preshaped fibrous reinforcement formed by distribution of chopped fibers by air, water flotation, or vacuum over the surface of a perforated screen to the approximate contour and thickness desired in the finished part. ...
  21. The piece of glass from which the optical fiber waveguide is drawn. The shape of the preform differs depending upon the application the finished product is intended for.
  22. a rough prepared biface from which a point was made.
  23. shaped or formed before being used.
  24. Compressed molding compound.
  25. Perform an action just before Oracle Forms navigates to the form from “outside” the form, such as at form startup.