Abstract: The invention relates to a plastic part having at least one thin wall, and designed to be slidably mounted on a support by its thin wall and having, in this thin wall: an elongate through-opening, having two lengthwise edges that are substantially parallel at least over part of their length; a spacer whose thickness is greater than that of the thin wall, able to slide in the opening between the two lengthwise edges thereof; and means of holding the spacer to the support while keeping the spacer inside the opening. Spacer can be connected to thin wall by deformable or breakable links.

Abstract: A method and apparatus for treatment of relatively moving substrate materials and the novel products produced thereby created by precise application of high temperature pressurized streams of fluid against the surface of the materials to melt and remove material which imparts a recessed channel to the materials that facilitates separation of the materials. The apparatus includes an elongate manifold for receiving heated pressurized fluid, such as air, disposed across the width of the relatively moving material and having a single slit the full width of the substrate for directing the fluid into the surface of the material. The substrate material is treated with an acrylic resin to eliminate jagged or frayed edges either prior to or after the melting and removal process by means of the high temperature pressurized fluid streams.

Abstract: A surface modified continuous filament yarn and method for producing same is provided wherein a continuous filament twisted yarn is stretched and, while in its stretched or elongated state, contacted with an effective amount of a swelling agent for a period of time effectively to substantially rupture fibers on the surface of the elongated yarn without effecting interior fibers of the yarn, thereafter quenching the swelling agent and recovering a modified continuous filament yarn.