Patent GB-309391-A (GB)
Title: Improvements in or relating to the production of articles substantially made of fabric coated proofed or impregnated with organic materials and the production of sheetings of organic materials
Filed: 1928-01-09
Abstract: 309,391. Dunlop Rubber Co., Ltd., and Trobridge, G. W. Jan. 9, 1928. Coating fabrics in long lengths; single coatings; treatment prior to coating.-In a process for the manufacture of fabric articles proofed or impregnated with organic materials such as rubber, and of sheets of such organic materials, in which the organic material is agglomerated from an aqueous dispersion upon the fabric which is fitted to or in contact with a porous backing, the fabric is brought into contact with liquids containing substances facilitating or causing agglomeration and is then brought into contact with the dispersion. The agglomerating liquid may be applied either directly to the fabric or to the porous backing, or to both. The fabric article may be fitted to a porous mould as described in Specification 287,946, [Class 70, Indiarubber &c.], and the process of deposition may be assisted by applying pressure or suction. The aqueous dispersion may be of rubber, natural, artificial, preserved, compounded or concentrated, and may contain inorganic materials. A compounded latex such as that described in Specification 287.946, [Class 70, Indiarubber &c.], may be used. As an example, a rubber coated fabric glove is made by fitting the fabric glove to a hollow porous former of, for example, porcelain, arranged so that its interior may be connected to a suction pump. The glove on the former is then dipped for two minutes into a solution of calcium chloride, potash alum, or formic or acetic acid, allowed to drain, and wiped with a cloth. It is dipped for one minute into the latex, and then the interior of the former is connected to the suction pump for one minute. It is then removed from the latex, inverted and drained, and while still under suction is placed in an oven at 100‹ C. for fifteen minutes. The glove may then be cured in known manner. In the making of rubber coated fabric for tyres &c. an endless piece of fabric is made to pass through a bath of compounded latex. The bath is fitted with one or more rotating porous rollers which are coated or impregnated with coagulating medium so that the latter is between the rollers and the fabric passing over them. The fabric then passes over one or more porous rollers which may or may not dip into the latex, and to the interior of which suction is applied. Drying of the fabric may be effected by heat, reduced pressure, or dehydrating substances. This last example may be modified by coating the fabric with coagulating medium and passing it over porous rollers not coated with coagulating medium, so that rubber is deposited on the fabric from the latex, the rubber coating being subsequently stripped off before or after vulcanization. Shaped articles may be made as described in Specification 287,946, [Class 70, Indiarubber &c.], the process being modified as before described. Fabric coated or impregnated with organic materials may be made by means of the apparatus shown in the Figure. The fabric is taken from a roll 1, and is either previously soaked in a coagulant or is passed through a bath 2 containing coagulant. Thence it passes under a roller 5 partly immersed in latex in a bath 4. After passing over guide rollers 6,7, the fabric passes under a porous hollow roller 8, the interior of which is connected to a suction pump. After leaving the bath the fabric is dried, and the rubber vulcanized. The process may be used with artificially prepared dispersions of vegetable or synthetic hydrocarbons or resins, such as dispersions of caoutchouc, guttapercha, balata, or condensation products of aldehydes with phenol or urea.