- n. 焊料預成型（preform 復數）
- v. 預先形成（preform 的第三人稱單數）
1.The final yarn structures in composites have changed comparing with those in the preforms after which are impregnated with matrix and consolidated into the final shape.
2.The series could handle 1-litre mineral water bottle preforms from 16 to 48 cavities.
3.This paper introduces the fabrication technology for knitted preforms. In-plane and out-of-plane Mechanical properties are studied which are compared with those of woven composites.
4.The results indicated that by HIPing porosities in the preforms can be closed and the densities can be increased, then the strength and ductility can be improved.
5.The production of three dimentional spherical reinforced preforms by means of one-side-sewing technology is presented.
6.In this paper, densification laws of rotary forging powder sintered preforms and the property of components have been investigated with orthogonal experiment method.
7.Injection moulding of bottle CAPS is distinctly different from that of preforms in that it is thin-wall moulding.
8.On the simultaneity, the actual shape of the yarns in performs was observed, which will be beneficial to the foundation of the cell modal in preforms.
9.Some problems of design for powder hot forging die have been discussed around the characteristics of forging deformation of powder preforms.