Abstract:
There is provided a fastener for engaging with a loop fabric, comprising a base having a front surface with a multiplicity of engaging projections. At least some of the engaging projections having a top surface end and an attached end. The at least some engaging projections top surface ends form an edge angle surrounding the projections. A mantle surface extending from the top surface end edge to the attached end. Generally at least one contour line of a side view of the mantle surface is strictly convex from the top surface edge to the attached end. The attached end can be fused to the front surface of the base and the top surface forming an edge at least partially surrounding the projection. There is also provided a first method for forming a fastener, comprising: . providing a multiplicity of suitable polymer particles; . providing a base with a front surface; . providing a contact release surface of a suitable surface energy; . dispersing, on the contact release surface, the multiplicity of polymer particles thereby forming separate preform projections sitting on and projecting from the release surface to corresponding terminal ends; . transforming the polymer particles, dispersed on the contact release surface, into an at least semiliquid state of a suitable viscosity, at least some of said particles being in contact with the contact release surface for a time sufficient to transform into preform projections having contact edges influenced by the surface energies of the polymer particles and of the contact release surface; . contacting and fixing the front surface of the base with the terminal ends of at least some of the preform projections; . removing the base, thereby separating the preform projections fixed thereto, from the release surface; and . thereby forming engaging projections projecting from the front surface of the base. There is also provided a second method for forming a fastener, comprising: . providing a multiplicity of suitable thermoplastic particles; . providing a base with a front surface; . randomly dispersing and adhering, on the base front surface, the multiplicity of polymer particles thereby forming separate projections attached and projecting from the base front surface to corresponding terminal ends; . providing a deformation means having a contact surface ; . contacting the terminal ends of the projections with the contact surface of the deformation means to deform the terminal ends so that they form a rim comprising an acute edge angle( the process of transforming the polymer to form a acute contact angle is also termed sharpening) thereby forming engaging projections
Abstract:
The invention relates to preformed pipe insulating jackets that can be easily and quickly fixed around pipes to be insulated. More specifically, the invention relates to very cheap and light, flexible and elastic, thin, multilayer jackets, their application and manufacture. The jacket has an inherent curvature with a radius (111) perpendicular to the longitudinal direction of the jacket and it comprises several substantive layers (127) secured to each other. The jacket may comprise paper (121) and plastic (122) layers.
Abstract:
There is provided a fastener for engaging with a loop fabric, comprising a base having a front surface with a multiplicity of engaging projections. At least some of the engaging projections having a top surface end and an attached end. The at least some engaging projections top surface ends form an edge angle surrounding the projections. A mantle surface extending from the top surface end edge to the attached end. Generally at least one contour line of a side view of the mantle surface is strictly convex from the top surface edge to the attached end. The attached end can be fused to the front surface of the base and the top surface forming an edge at least partially surrounding the projection. There is also provided a first method for forming a fastener, comprising: . providing a multiplicity of suitable polymer particles; . providing a base with a front surface; . providing a contact release surface of a suitable surface energy; . dispersing, on the contact release surface, the multiplicity of polymer particles thereby forming separate preform projections sitting on and projecting from the release surface to corresponding terminal ends; . transforming the polymer particles, dispersed on the contact release surface, into an at least semiliquid state of a suitable viscosity, at least some of said particles being in contact with the contact release surface for a time sufficient to transform into preform projections having contact edges influenced by the surface energies of the polymer particles and of the contact release surface; . contacting and fixing the front surface of the base with the terminal ends of at least some of the preform projections; . removing the base, thereby separating the preform projections fixed thereto, from the release surface; and . thereby forming engaging projections projecting from the front surface of the base. There is also provided a second method for forming a fastener, comprising: . providing a multiplicity of suitable thermoplastic particles; . providing a base with a front surface; . randomly dispersing and adhering, on the base front surface, the multiplicity of polymer particles thereby forming separate projections attached and projecting from the base front surface to corresponding terminal ends; . providing a deformation means having a contact surface ; . contacting the terminal ends of the projections with the contact surface of the deformation means to deform the terminal ends so that they form a rim comprising an acute edge angle( the process of transforming the polymer to form a acute contact angle is also termed sharpening) thereby forming engaging projections
Abstract:
The invention relates to process for roughening thermoplastic films and roughed films. The invention further relates to process for preventing thermoplastic packaging films from slipping on each other and a suitable system for such purpose. The essence of the roughening process is that practicles consisting of the same polymer as that of the film and/or other plastic material being able to weld together with that, and having suitable size and/or abrasion resistance, are brought to the surface to be roughened of semi-finished product having sufficient reserved heat content to maintain condition appropriate for welding said particles on said thermoplastic film surface to be roughened or on one or on both film surfaces being re-heated to such temperature and are dispersed in suitable closeness and configuration and that condition of the roughened surface is maintained until desired welding process is completed. Process for preventing thermoplastic packaging films from slipping on each other characterised in that a system comprising films to be stacked - at least one of which is roughed - and has protrusions of suitable closeness on its surface; a binding element having a loose fibrous structure and stability is placed on the film or on its specified parts, on the entire surface or on surface part(s); said binding element comprises fibres of such closeness and layer thickness that between the fibres of the binding element and the protrusions of the roughed film a mechanical joint is formed.