Abstract: A form, fill and seal machine packages products in a thermoplastic material which is formed into a tube and sealed with a measured amount of the product within. The transverse seals in the tube are formed in a cyclic operation by a pair of cooperating sealing heads. The heads clamp the tube walls together above and below a line of severance between two sequentially formed packages and weld the tube walls together along transverse sealing areas at each side of the line of severance. To heat the material to a fusing temperature, the one sealing head has a chamber from which hot gas is directed onto one side of a sealing area, and the other sealing head has an electrical heater for applying a thermal impulse of heat to the other side of the sealing area. The hot gas presses the thermoplastic material against the electrical heater and provides a "free form" clamp for uniform sealing pressure.

Abstract: In a bagging machine for producing industrial bags, an improvement comprising a sealing head compartmented on the back side, and included is a plate valve to block at least certain of the compartments during the initial part of the sealing cycle. During the sealing cycle, a heated air stream exiting from the sealing head is controllably channeled to occur at defined regions, e.g., opposite the bag gussets and lap seam, and then by opening the valve, the channeling is terminated and heat is applied uniformly to complete the bag end sealing.

Abstract: In a bagging machine for producing industrial bags, an improvement comprising a sealing head compartmented on the back side, and included is a plate valve to block at least certain of the compartments during the initial part of the sealing cycle. During the sealing cycle, a heated air stream exiting from the sealing head is controllably channeled to occur at defined regions, e.g., opposite the bag gussets and lap seam, and then by opening the valve, the channeling is terminated and heat is applied uniformly to complete the bag end sealing.

Abstract: Side gusseted industrial bags are continuously (or intermittently) formed from continuous web materials, and simultaneously filled and sealed in one fast operation by the method and apparatus of this invention.

Abstract: A resealable sealing assembly for inspection port holes cut through the insulation of insulated surfaces is provided by the method and apparatus of this invention. The resealable sealing assembly is comprised of a rigid sleeve permanently installed in the insulation port hole and a removable plug made of compressible elastomeric material which, when inserted in the rigid sleeve, forms weatherproof seals at two separate surface areas between the plug and the sleeve. The resealable sealing assembly is applicable for use in a wide variety of textures of insulation from very soft and flimsy to hard.

Abstract: Side gusseted industrial bags are continuously (or intermittently) formed from continuous web materials, and simultaneously filled and sealed in one fast operation by the method and apparatus of this invention.