Abstract: The open edge of a plasticboard is moved into a heating and sealing unit having a metal form with a U-shaped cross-section. A spacing tape and a release tape line the metal form. An induction or resistance heater is coupled to the metal form to raise the temperature thereof and heat the open edge to form a molten plastic edge wall, with the outer edges of the edge wall in sealing engagement with the form. The molten plastic fills the cavity between the form and the edge wall and forms a solid, continuous end wall upon cooling of the molten plastic. A batch sealing unit has a form moved directly into engagement with the edge wall to be sealed. A continuous sealing unit has an elongated form. A conveyor moves the plasticboard through the form in a continuous flow path with the form inclined to the path of the edge board to establish relative lateral movement. A cooling unit cools the end wall as the board moves from the form.

Abstract: A preformed flock lined rubber-like glove has its cuff folded back to expose the flocked lining and is mounted in a rotating support. A spray nozzle deposits a band of the hot-melt adhesive on the flocked lining of the exposed and rotating cuff. The hot-melt adhesive is a combination of a hot-melt adhesive resin and a uniform dispersion of small particles which create heat in the presence of a high frequency magnetic field. The hot-melt adhesive is allowed to solidify to a solid mass. The glove is telescoped downwardly onto a polyethylene sleeve supported on a rigid form and the cuff is unfolded to place the adhesive into engagement with the sleeve. A high frequency unit includes a high frequency coil having a pair of conducting bars at least one of which is movable. The glove and sleeve subassembly is clamped between the conducting bars and the coil is energized from a high frequency source. The fine particles are activated to heat the hot-melt band simultaneously with application of pressure.

Abstract: A multiple part assembly includes an enclosure for a moist pad member. The assembly included a cup-shaped container within which the pad member is located. A heat seal secures the outer edge of the pad member to the container. A support is secured encircling the container and includes an annular backing member encircling the open end thereof. The backing member is adhesively affixed and peelable for the support. A plastic film cover overlies the pad member and adjacent portion of the backing member. An encircling fusion seal joining the plastic film cover to the backing member for removal of the cover with the backing member. A plastic heating tool includes an annular or circular tool element formed of appropriate material which is responsive to an inductive field for self-generation of heat within the tool for attaching the pad to the container.

Abstract: A plastic heating tool unit is provided for cutting, sealing and like working of a relatively thin or film-like plastic element. The tool unit may function to sever a plastic element from a web and create firm thermal attachment thereof to another member. The tool unit includes an appropriately shaped annular or circular tool element formed of appropriate material which is responsive to an inductive field for self-generation of heat within the material. An annular radio frequency induction coil unit is coupled to the tool element. A heat transfer member is secured to the tool element and to a forced cooled heat sink which cools the transfer member and thereby the tool element. The transfer member creates a selected retarded cooling rate of the tool element to provide an improved interaction of the tool member and the plastic element and for more effective heating and cooling thereof.