The present invention relates to a process of using steam to achieve simultaneous impregnation and drying of lignocellulosic material to improve the strength of lignocellulosic material and to reduce the number of serial processing steps. The steam may be either indigenously generated by way of a heated press or heated nip, or the steam may be externally applied.

A continuous method of impregnating food material such as vegetables, fruit, meat, eggs, and fish wherein pieces of the food material are immersed in a concentrated solution, such as brine, syrup, meat curing solutions, humectant solutions and mixtures thereof, said pieces being initially buoyant in said solution and being passed together with said solution along a flow path to a separation zone wherein the impregnating solution flows downwards at a rate greater than the rate of flow of the food...

A mixture of wood chips and impregnation liquor is continuously passed through an impregnation zone, the mixture is agitated throughout said impregnation zone to maintain the consistency of the mixture constant and the residence time of the chips uniform throughout said impregnation zone, the mixture is withdrawn from said impregnation zone, excess liquor is removed from the chips and said chips are then digested in a cooking zone.

The invention involves a fluid treatment device to solution or melt impregnate a resin or polymer or any combination thereof into a reinforcement which can be utilized to fabricate composite materials for laminates, circuit boards, structural/aerospace materials, automotive components, etc. The invention offers significant advantages and benefits over existing methods and equipment and allows the impregnation process to be performed at lower cost and higher efficiency with increased environmenta...

A method of producing a low cost impregnated and coated fiber useful in forming pump, valve, expansion joint, hydraulic cylinder and similar packings capable of resisting high caustic concentrations is provided. In accordance with this method a relatively low cost yarn, such as rayon, is simultaneously subjected to a spreading operation and passed through a highly alkaline colloidal tetrafluoroethylene (TFE) solution. As the yarn fibers are spread from a fiber bundle to a flat ribbon-like array ...

Strand immersion means include vertically aligned and spaced-apart funnels disposed within a vacuum system. Strand supply and heating means are disposed within the vacuum system.

A process and system for vacuum impregnation of a fiber reinforcement, such as carbon cloth, with a resin to produce a resin-fiber composite. Liquid resin enters in arrangement or system comprising a fiber reinforcement layer on a tool or mold and is directed via a system of flow paths to impregnate the fiber reinforcement layer uniformly across the width thereof and along the length of the fiber reinforcement layer. According to one embodiment, a fiber reinforcement layer, e.g., carbon cloth, i...

A process for expanding tobacco is provided which employs carbon dioxide gas. Tobacco temperature and OV content are adjusted prior to contacting the tobacco with carbon dioxide gas. A thermodynamic path is followed during impregnation which allows a controlled amount of the carbon dioxide gas to condense on the tobacco. This liquid carbon dioxide evaporates during depressurization helping to cool the tobacco bed uniformly. After impregnation, the tobacco may be expanded immediately or kept at o...

A process is disclosed wherein two co-reactive resin streams are mixed immediately adjacent the entrance of an impregnation die used to make products by the pultrusion process. The mixing occurs immediately adjacent the fibers as they are pulled into the central duct opening of the die. The resin streams are delivered to the entrance of the impregnation die by use of a resin feed head positioned at the inlet of the impregnation die. An ultrasonic driver coupled to the resin feed head vibrates an...

Two co-reactive resin stream are mixed immediately adjacent the entrance of an impregnation die used to make products by the pultrusion process. The mixing occurs immediately adjacent the fibers as they are pulled into the central duct opening of the die. The resin streams are delivered to the entrance of the impregnation die by use of a resin feed head positioned at the inlet of the impregnation die. An ultrasonic driver coupled to the resin feed head vibrates and agitates the resin streams imp...