Coating processes – Solid particles or fibers applied – Fluidized bed utilized
Patent
1987-03-16
1989-06-13
Beck, Shrive
Coating processes
Solid particles or fibers applied
Fluidized bed utilized
427195, 118308, 118312, 118316, 118325, B05D 110, B05D 122
Patent
active
048391999
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a process and a device for treating threads, slivers or the like consisting of various filaments and optionally processed in a tissue or knitwear with a treating agent, a separation between the filaments being effected in order to have the agent better penetrate into the structure of filaments.
Similar processed and devices are generally known, in particular for the production of composed materials consisting of thermoplastic or thermosetting substances, wherein filaments function as reinforcing material. For instance in Dutch patent application No. 70 01623 a process is described, wherein the threads of slivers consisting of a great number of filaments are separated before a synthetic resin in powder form is applied thereon, whereupon this resin is molten in result of which a coherent product is obtained. The spreading of the filaments in the slivers is for instance effected according to the Dutch patent application by giving to the filaments an electrostatic charge with the same sign. According to another embodiment the slivers are passed through a venturi, which in the same direction is passed by a fluid at a high velocity. The spreading of the filaments occurs then under the influence of the relaxation of the fluid on leaving the venturi.
The invention provides for a process as mentioned in the preamble, which is characterized in that the treating agent is suspended in one or more gas or liquid streams which are then directed to the material to be treated under controllable pressure.
It has turned out that in this way a very efficient spreading of the filaments is effected, as a result of which impregnating material suspended in the streams of fluid penetrates well between the filaments and impregnate same very homogeneously. This results in the final product, for instance a sheet of plastic material reinforced by filaments, being of a very homogenous composition.
The process according to the invention is applicable no matter what the nature of the filiments or the nature of the impregnating agent is.
For instance, powdery cermic products and metal products are considered as impregnating materials in addition to thermoplastic or thermosetting materials.
The process according to the invention is also feasible for the application of layers of impregnating material of various thicknesses on various sides of the material to be impregnated. For instance a tissue or knitwear which is applied internally or externally to a lightweight core can be impregnated by application of the invention.
As treating agent a grinding material can also be used, which makes the material treated with it rough, in result of which it is made better suitable for the adherence to it of a sizing and the like.
It is preferred to direct the gas streams wherein the treating material is suspended with applications of the venturi principle to the material to be treated.
The treating material can be suspended in a gas stream in various ways, for instance by atomizing it in the gas stream as a melt or liquid. It is also possible to dose a powdery treating material directly into a gas or liquid stream from a container. It is also possible to suspend the treating material in a fluidized bed in a gas and to withdraw the gas streams to be directed to the material to be treated from the fluidized bed by suction power. Per se the application of a fluidized bed for the impregnation of bundles of filaments is known, for instance from Dutch patent specification 151 928. In this known method, however, the material to be impregnated is passed through the fluidized bed of impregnating material.
If , however, in the process according to the invention a fluidized bed is applied, the actual impregnation occurs outside this bed.
The invention also relates to a device for carrying out the invented process with a space wherein via a perforated bottom a gas can be fed and a supply-pipe for powdery treating agent, said device being characterized in that the said space is provided with one or more suction pipings, which on the discharg
REFERENCES:
patent: 3027869 (1962-04-01), Ball
patent: 3172777 (1965-03-01), Pano et al.
patent: 3189506 (1965-06-01), Cobb et al.
patent: 3339357 (1967-09-01), Marzocchi et al.
patent: 3390039 (1968-06-01), Caughman et al.
patent: 3439649 (1969-04-01), Probst et al.
patent: 3589333 (1971-06-01), Quackenbush
patent: 3830638 (1974-08-01), Jumentier et al.
patent: 4263871 (1981-04-01), Gibson
patent: 4472224 (1984-09-01), Pryor
patent: 4640219 (1987-02-01), Anderson et al.
Beck Shrive
Flexline Services Ltd.
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