Apparatus is provided for carrying out a varnish impregnation method wherein a sheet-like base material is sequentially passed through a low-viscosity liquid storage region storing a low-viscosity liquid such as a solvent, a thermal syphon region, and a varnish storage region storing a varnish, the thermal syphon region being positioned between the low-viscosity liquid storage region and varnish storage region and communicating with both regions at air tight seals closed by liquid surfaces, and ...

An improved grout impregnation method which uses an injection tube for contacting and mixing different kinds of materials supplied thereinto separately to prepare a grout and impregnates the grout into the earth through an injecting opening provided at a tip end of the tube. In this method, a first pressure-holding valve is provided within a higher-pressure path for one of the materials which is supplied under a higher pressure, a mixing section is provided downstream the first pressure-holding ...

A method of ultrasonically treating a fibrous strand for subsequent use in high speed filament winding operations. The strand, composed of a multiplicity of filaments such as glass or carbon, is initially coated with a silane-type binder which is dried onto the surface of the filaments. The strand is then passed at a high speed through a bath of thermosetting resin, and while submerged in the resin is subjected to ultrasonic energy. The ultrasonic energy increases the rate of interaction of the ...

An embodiment assembly for the impregnation of a continuous length of fibers comprises a convex surface and a non-convex surface over which the length of fibers is drawn under tension. The pressure of impingement on the surfaces alternately separates and consolidates the fibers in sequence during their impregnation with the resin, to obtain a complete and homogeneous impregnation.

Solvent-free alkyl trialkoxy-silanes whose alkyl groups have 2 to 8 carbon atoms and whose alkoxy groups have 1 or 2 carbon atoms are used for the in-depth hydrophobic impregnation of concrete. Propyl and isobutyl trialkoxy-silanes display an especially deeply penetrating hydrophobizing action which is greater than that of solutions of these silanes.

Process for producing a resin-fiber composite which comprises applying a "B" stage resin film to a mold surface, placing a fiber reinforcement layer over the "B" stage film, applying a porous parting film over the fiber reinforcement layer, applying a bleeder layer over the fiber reinforcement layer and placing a non-porous material over the bleeder layer. A bag is placed over the materials and sealed to or around the mold. A vacuum is applied to the mold and then the assembly is heated to a tem...

Impregnation of graphite with uranyl nitrate dihydrate in tertiary butyl alcohol solution.

A method of impregnating a porous article with impregnant to seal the pores thereof, which comprises placing the article in a vessel, evacuating the vessel to withdraw air from the pores, releasing the vacuum with the pores beneath the surface of a liquid impregnant in the vessel, removing excess impregnant from the vessel, washing excess impregnant from the surface of the article by supplying washing fluid to the vessel, removing the fluid from the vessel, heating the article while still within...

The invention described in this specification concerns the impregnation and/or coating of a body of graphite or carbon with ruthenium metal or a ruthenium compound or both. The method comprises removing gaseous fluid from the carbon or graphite body, contacting the body with a solution or suspension of the ruthenium metal or ruthenium compound and evaporating or allowing to evaporate the solvent or suspending medium so as to leave the ruthenium metal or ruthenium compound in contact with the bod...

Apparatus for the repair of a concrete section comprising an impregnation device to impose a slight vacuum over the affected area and probes to inject a monomer mixture which polymerizes in situ to produce a repaired section which can be returned to normal service.