| 释义 |
pre-ˈimpregnate, v.
[pre- A. 1.]
trans. To impregnate (a material) with something prior to mechanical processing. So pre-ˈimpregnated ppl. a., spec. (a) of paper insulation: impregnated with oil and resin before use in electric cables; of a cable: containing such insulation; (b) of reinforcing material for plastics: impregnated with synthetic resin before fabrication; pre-impregˈnation.
1933Jrnl. Inst. Electr. Engin. LXXIII. 353/2 The design conditions are extremely simple as the dielectric depends solely on the use of the pre-impregnated paper, the selection of gas-space dimensions, and the pressure of the gas. 1937Ibid. LXXXI. 634/1 With proper attention to the physical properties of the impregnating medium, this pre-impregnation ensures the absolute definition of the gas spaces up to the maximum working temperature of the cable. 1958Times 1 Dec. 2/5 Aeroplastics Limited..have commenced production of their new process of preimpregnating glass fabric. 1958D. J. Duffin Laminated Plastics iv. 73 Either a dry or preimpregnated glass reinforcement is now laid in the mold. 1960Jrnl. Inst. Electr. Engin. VI. 694/1 The pre-impregnated cable does not suffer from this kind of trouble because the paper is dried and impregnated in sheet form before application to the cable. 1965Mod. Plastics Encycl. 1966 628/1 A preimpregnation step is frequently used, in which the reinforcing web is passed through a resin bath before lay-up. 1970Materials & Technol. III. xii. 871 Mats or fabrics are pre-impregnated with resin by passing through baths containing a solution of the resin. The solvents are removed by drying and the material is worked into mouldings. 1971Nature 30 July 305/2 These preimpregnated layers are then moulded together in the normal way under heat and pressure, and cured. |