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Method for impregnating a fibrous base material with a substantially air-free varnish
| Details |
Inventors: Hayashi, Shigetoshi; Mino, Takeyasu; Yagi, Yasuhiro; Harada, Mitsuaki;
Assignee: Takuma Co., Ltd. (Osaka, JP)
Primary Examiner: Lusignan; Michael
Assistant Examiner: Dudash; Diana L.
Attorney, Agent or Firm: Griffin Branigan & Butler
A method and apparatus for impregnating a fibrous base material with a varnish liquid, wherein the so-impregnated base material is substantially air free. A base material is passed under the surface of and through a supply of low-viscosity liquid such as to impregnate the base material with the low-viscosity liquid and displace air from the base material so as to provide a substantially air-free base material. The air-free base material is passed through an entrance for and into a syphon. An inert gas is supplied to the syphon so as to maintain an inert gas atmosphere therein sufficient to maintain the air-free condition of the base material. The air-free base material is then passed through an exit of the syphon and under the surface of and through a supply of varnish liquid sufficiently to displace the low-viscosity liquid from the air-free base material and impregnate the air-free base material with the varnish liquid. |
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DETAILED DESCRIPTION OF THE INVENTION As noted above, as the base material passes through the low-viscosity liquid, the air trapped in the base material will be displaced by the low-viscosity liquid and eliminated.
The base material impregnated with the low-viscosity liquid in then transferred to the syphon filled with an inert gas.
Preferably, the base material is pinched so that the amount of the low-viscosity liquid contained therein is reduced to that amount required only for solution of the inert gas disposed around and about fiber bundles of the base material, as explained in more detail below.
Subsequently, the base material carrying that small amount of the low-viscosity liquid together with the inert gas which is dissolved in the low-viscosity liquid is conveyed to the ordinary varnish liquid.
In other words, the base material, which contains a small amount of the low-viscosity liquid in which the inert gas is dissolved, is substantially free from air prior to being conveyed to the varnish liquid, and the syphon prevents air from entering the air-free base material during the transition from the low-viscosity liquid supply to the varnish liquid supply.
Accordingly, the impregnated base material will be substantially air free.
As the base material is brought into the varnish liquid, the low-viscosity liquid, in which the inert gas is dissolved, is dissipated into the varnish liquid.
Consequently, the low-viscosity liquid in the base material is replaced by the varnish liquid, and, thus, the base material will be uniformly impregnated with the varnish liquid.
The amount of the low-viscosity liquid dissipated into the varnish liquid is not great and, in any event, is less than that contained in the varnish liquid carried out of the supply of varnish liquid by the impregnated base material and, hence, causes no substantial dilution of the varnish liquid.
The base material is preferably pinched at both the entrance and the exit of the syphon by a pinching means which will largely contain the inert gas in the syphon such that the inert gas is largely prevented from flowing out of the syphon and, especially, into the low-viscosity liquid and also into the varnish liquid
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