Abstract: A method for making an abrasive article is disclosed, including the steps of providing a substrate having abrasive means on one surface, and providing a plurality of hooking stems on the opposite surface thereof. Several illustrative variations of the inventive method are disclosed.

Abstract: An adhesive article for use in a microwave oven is provided having a hot-melt or heat-curable adhesive substrate, and a susceptor layer of electrically conductive or semi-conductive microwave absorbing material that is disposed on at least a portion of the substrate. The article becomes less absorbent of microwave radiation upon the melting or deformation of the substrate. This article is suitable for adhering one adherend to another by exposing said article containing a hot-melt adhesive substrate to microwave energy.

Abstract: An adhesive article for use in a microwave oven is provided having a hot-melt or heat-curable adhesive substrate, and a susceptor layer of electrically conductive or semi-conductive microwave absorbing material that is disposed on at least a portion of the substrate. The article becomes less absorbent of microwave radiation upon the melting or deformation of the substrate. This article is suitable for adhering one adherend to another by exposing said article containing a hot-melt adhesive substrate to microwave energy.

Abstract: An apparatus and method for rapidly and continuously poling a film of polymeric material exhibiting at least one of pyroelectric and piezoelectric characteristics to yield a poled film having a high coefficient of at least one of pyroelectric and piezoelectric properties, and a high degree of uniformity of polarization throughout its thickness. The method of the present invention includes applying a plurality of time-spaced electric field pulses across a portion of the film. The apparatus of the present invention includes a drive for advancing the film and a pair of electrodes that establish an electric field across the film. A hot poling roller serves as a high voltage electrode and a grounded roller contacts a conductive layer coated on the other side of the film. A voltage source and a switch coact to apply a plurality of time-spaced electric field pulses between the two electrodes.

Abstract: An apparatus and method for rapidly and continuously poling a film of polymeric material exhibiting at least one of pyroelectric and piezoelectric characteristics to yield a poled film having a high coefficient of at least one of pyroelectric and piezoelectric properties, and a high degree of uniformity of polarization throughout its thickness. The method of the present invention includes applying an electric field greater than 1000 K volts/cm across the film for less than 180 seconds. The apparatus of the present invention includes a drive for advancing the film and a pair of electrodes that establish an electric field across the film. In a first embodiment, a hot poling roller serves as a high voltage electrode and a grounded roller contacts a conductive layer coated on the other side of the film to provide the second electrode. In a second embodiment both electrodes are provided by hot poling rollers with one being connected to a high voltage potential and the other to ground potential.

Abstract: An apparatus and method for continuously poling a film of material exhibiting pyroelectric and/or piezoelectric characteristics are disclosed. The apparatus includes a drive for advancing the film, a hot poling roller, a cold fixing roller, and a pair of electrodes that establish an electric field across the film while it is heated by the hot roller. In a first embodiment, one side of the film is coated with a conductive layer that is electrically grounded to serve as a ground electrode and the poling roller serves as a high voltage electrode for establishing the electrical field across the film. In a second embodiment, the poling roller is electrically grounded and a plurality of corona charging devices are employed as the high voltage electrode. In both embodiments, the poling roller is separated from direct physical contact with the film by a resistive layer in order to avoid serious damage to the film due to electrical arcing that can occur through a defective or thinner than normal area of the film.