초록 ▼

A method for applying a closing tape to an extruded foam article is disclosed. The tape is applied immediately after the article is extruded and while the article is still subject to shrinkage, which is common with extruded foamed products. The tape is prestressed and is of a material to alleviate t

A method for applying a closing tape to an extruded foam article is disclosed. The tape is applied immediately after the article is extruded and while the article is still subject to shrinkage, which is common with extruded foamed products. The tape is prestressed and is of a material to alleviate the problems associated with shrinkage. This method is particularly appropriate for applying a closing tape to an extruded polyethylene pipe insulation product which has been longitudinally slit to allow the pipe to be located interior to the insulation. The tape has one side attached to one side of the slit with the other portion of the tape being positioned for closing the slit by engaging the opposite side of the slit. A pressure sensitive adhesive is provided on the tape and a release liner protects the adhesive on the other portion of the tape.

대표청구항 ▼

An in-line method of producing pipe insulation having a longitudinal slit therein with a pressure sensitive adhesive tape secured to one side of said slit and a free edge of said tape overhanging said slit for engaging the pipe insulation to the other side of said slit whereby the slit can be held c

An in-line method of producing pipe insulation having a longitudinal slit therein with a pressure sensitive adhesive tape secured to one side of said slit and a free edge of said tape overhanging said slit for engaging the pipe insulation to the other side of said slit whereby the slit can be held closed by said tape adhesively engaging said pipe insulation either side of said slit, said method comprising extruding the pipe insulation which includes a foaming agent for forming cells in said pipe insulation with said extruded pipe insulation having a continuous outer skin, cooling said extruded pipe insulation, slitting said extruded pipe insulation to form said slit, and adhesively securing, in a prestressed state, said tape to said pipe insulation immediately adjacent said slit while said pipe insulation is still subject to substantial post extrusion shrinkage, said tape prior to being adhesively secured to said pipe insulation is prestressed longitudinally to cause elongation thereof generally corresponding to the post extrusion shrinkage of said pipe insulation whereby after manufacture, the post extrusion shrinkage of said pipe insulation relieves the prestress of said tape.