Fabric (woven – knitted – or nonwoven textile or cloth – etc.) – Nonwoven fabric – Nonwoven fabric with a preformed polymeric film or sheet
Patent
1997-09-24
2000-05-02
Pezzuto, Helen L.
Fabric (woven, knitted, or nonwoven textile or cloth, etc.)
Nonwoven fabric
Nonwoven fabric with a preformed polymeric film or sheet
442183, 442184, 442286, 442287, 442290, 442291, 442293, 442304, 442329, 442395, 442398, 442399, 442401, B32B 2734
Patent
active
060572558
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a strip material comprising a support which, at least on one side, has a plastics layer, plane on the outside, traversed by throughflow passages. The strip material is particularly suitable for the manufacture of paper machine belts for the forming, pressing and drying region thereof, and of filter media, in this context, particularly of belt filter media.
A strip material of the aforesaid type for employment in a paper machine is described in EP-B-0 196 045. It comprises a support in the form of a liquid pervious fabric onto which a layer, 1,3 to 5 mm thick, of an elastomeric polymer resin has been applied. The plastics layer comprises throughflow passages which pass from the otherwise smooth and plane outside down to the support and which, in the paper machine, serve as dewatering passages.
The production of the throughflow passages is brought about in that textile fibres are homogeneously dispersed in the polymer resin, prior to the mixture of textile fibres and polymer resin being applied onto the support. As an alternative to the aforegoing, a fibre fleece may first be applied onto the support, whereafter the coating of polymer resin is applied. In both cases the textile fibres are composed of an organic material which can be dissolved by the application of a solvent, the plastics layer being resistant to this solvent. The leaching out of the textile fibres is carried out after the application of the polymer resin by the application of the solvent such that the throughflow passages are formed the configuration and orientation of which corresponds to the leached out textile fibres.
In a less preferred embodiment particulate corpuscles are proposed instead of the textile fibres which are distributed homogeneously in the polymer resin. Inorganic salts or their hydrates or oxides are proposed as the material for those corpuscles. By appropriate solvents they can be leached out of the polymer resin in the same manner as the textile fibres and in the course thereof leave behind pore cavities.
The manufacture of the above described paper machine belt involves difficulties because polymer resins are inclined, after curing, to form a closed surface which inhibits the dissolving out of the soluble textile fibres or corpuscles contained in the polymer resin. In order to solve this problem, it has been proposed in EP-B-EPO 273 613 to so grind down the surface of the plastics layer, that a communication is formed to the soluble fibres and in addition a smooth surface is generated. Such a grinding procedure, however, is very time consuming. Moreover, it is first necessary to apply an appropriate excess of plastics material and during the grinding procedure dust is formed which must be sucked off and be either disposed of or be processed for reuse. Moreover, a smooth surface is formed which inhibits a release of the paper strip from the paper machine belt. The reason is that paper strips are inclined to become firmly drawn against smooth surfaces.
Apart from the aforegoing disadvantages, paper machine belts of this genus are claimed to have a number of advantages as compared with known felt materials, according to the batt-on-base principle, more particularly an increased resistance against permanent deformation and thereby a longer operating life and resulting therefrom reduced maintenance costs, improved abrasion resistance and higher structural strength, lower affinity for contaminating substances as well as more uniform pressure distribution and thus improved de-watering charateristics.
The aforedescribed development was preceded by a proposal to embed in the fibres of a paper machine felt fibres or particles which can be leached out by means of a solvent in relation to which the remaining fibres and the support of the paper machine belt are solvent resistant, i.e. stable (DE-C-34 19 7 or 8). The manufacture proceeds such that a non-woven fibre web of insoluble fibres and soluble components is formed and is needle-bonded onto the support and that thereafter the paper machine belt is comp
Conrad Munzinger & Cie AG
Pezzuto Helen L.
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