摘要:
The present invention includes novel barrier webs that have certain desirable physical qualities such as water resistance, increased durability, improved barrier qualities and the like. The present invention further comprises a barrier web comprising a web that has been treated with a curable shear thinned thixotropic polymer composition, the fabric being adapted to be substantially impermeable to liquids, permeable to gases and impermeable to microorganisms. The barrier webs of the present invention are either impermeable to all microorganisms or are impermeable to microorganisms of certain sizes. The present invention also includes fabrics that are capable of either selective binding certain microorganisms, particles or molecules depending upon what binding partners are incorporated into the polymer before application to the fabric.
摘要:
The present invention relates to methods for the controlled placement of a curable, shear thinnable polymer composition into a porous web. The controlled placement is performed by applying tension to the porous web. The polymer composition is applied onto a surface of the web. The composition is shear thinned sufficiently to reduce its viscosity and selectively place it into the tensioned web to encapsulate at least some of the structural elements of the web, leaving most of the interstitial spaces of the porous web open. The invention also relates to methods for selectively placing the polymer composition in a substantially continuous region extending through the web so that the polymer composition fills the interstitial spaces and adheres adjacent structural elements in the region. In the areas in the web above and below the filled region, at least some of the structural elements are encapsulated and most of the interstitial spaces are open. The invention also relates to methods for the controlled placement of a polymer composition into a tensioned porous substrate having a matrix of open cells by applying a localized shear force to selectively distribute a curable, shear thinnable polymer composition within the substrate, at least partially individually lining the cell walls of at least some of the cells, and leaving most of the cells open.
摘要:
Products and methods for controlling the porosity and permeation of a web are provided using a curable thixotropic shear thinnable polymer composition that preferably encapsulates a plurality of fibers of the web and/or forms an internal layer within the web. Webs suitable for several different uses are featured, for example medical garments resistant to permeation by a virus or bacteria. The effective pore size of the web is controlled by regulating various factors such as the thickness of the polymer composition encapsulating the fibers and the thickness and placement of the internal polymer layer. Other factors include the polymer density, structure, and crosslinking orientation, as well as the diffusion, permeation and sorption of the polymer.
摘要:
A continuous process for treating a web of material by the wet-in-wet application of two serially arranged treatment baths includes the steps of: applying a first treatment bath to the web; squeezing off excess moisture from the web to a specified moisture content; applying a second treatment bath to the web while it is still wet from the first treatment bath such that the web is in contact with a quantity of the second bath that is no greater than that quantity that can be continually absorbed by the web; replenishing the second treatment bath; and reducing the moisture content of the web to a specified moisture content immediately after application of the second treatment bath.
摘要:
A method and apparatus for the continuous treatment of a textile web is disclosed. The apparatus comprises a foulard in which the textile web is provided with a first treatment bath and squeezed off to a moisture content of 60 to 100%. The web then is conducted to a gore applicator in which the web is provided with a second bath application of 40 to 100%. The second application occurs in an upright vat in which the textile web is always in contact with only a very small quantity of continually replenished treatment bath. The vat is sealed at a bottom gap by two mutually opposing inflatable hoses with one hose disposed on each side of the textile web. The hoses sealingly abut against the web and wipe off treatment bath entrained by the web to a predetermined total moisture content. In the dyeing process, the web subsequently runs into a steam apparatus and then into a washing apparatus.
摘要:
A yarn with a smooth coating is produced by coating a yarn with a thermoplastic material in the melt state, drawing the coated yarn through a heated dye, and cooling the coating.
摘要:
Coating a porous substratum with a viscous substance is performed by means of a rotatable cylindrical sieve (plain-mesh screen), comprising an internal squeegee for pressing said substance through the perforations of the screen. The substratum are passed in contact with the screen and is supported at the contact zone by a roller. Although the peripheral speeds of the screen and the substratum is substantially equal, the rotational speed of the support roller is such, that its peripheral speed is either smaller or greater than that of the substratum to an extent of at least 5%. This avoids the occurrence of the phenomenon of pinhole formation in the coated substratum.
摘要:
Impregnated or coated linear material, for example, coated glass fibers, are dried in one or more calibrated spaces which control the percentage of impregnate or coating. A sweeping device moves the material laterally assuring complete sweeping and hence self-cleaning of the calibrated spaces.
摘要:
A device for coating a travelling web constituted by the combination of two elements: an apparatus for uniformly applying a coating substance upon the web and a thin flexible doctor blade resting with little pressure upon the substance applied on the web.
摘要:
A pair of specially configured scraper blades mounted for rotating into and out of compressive wiping engagement with a fabric, previously dipped in a liquid coating, to remove excess liquid from the fabric. An air cylinder, or spring, is utilized to maintain curved lips of the scraper blades in predetermined compressive relation with the moving fabric.