Back to results
US 4,511,426 AGranted
Hot gas sealing device
AssigneeNorden Packaging Machinery AB
InventorHans Linner
Life of this patent
Estimating the term…
Abstract
A device for hot air welding, comprising a nozzle for activation of a sealing area around an opening at the inside of a hollow body. The nozzle has a slot device for directing a flow of air out through the opening for activating the sealing area when the nozzle is in the operative position thereof. Means are arranged for cooling the hollow body externally around the sealing area. There are also provided means for recirculation of the gas.
Claims5
A device for hot gas welding, preferably hot air sealing, comprising:
- a nozzle for activating a sealing area around an opening at the inside of a hollow body, for instance a tube,
- a slot device in said nozzle arranged for directing a flow of gas out through the opening and activating said sealing area when the nozzle is in the operative position thereof,
- means at the opening of the hollow body for recirculation of the flow of gas,
- means for cooling the hollow body externally around the sealing area comprising a loop containing a cooling medium, and
- a gas guiding element of a heat insulating material, acting as a heat shield for the goods within the hollow body.
2 more elements
A device for hot gas welding a tube by forming a transversal seal at one end of the tube, comprising:
- a nozzle for activating a sealing area at the inside of the tube opening at said one tube end,
- a slot device in said nozzle for directing a flow of gas out through the opening and activating said sealing area when the nozzle is in the operative position thereof,
- means for cooling the tube externally around the sealing area comprising a loop containing a cooling medium,
- a gas guiding element of heat insulating material acting as a heat shield for the goods within the hollow body, and
- press jaws compressing the tube end after the nozzle has been withdrawn.
2 more elements
Dependencies are inferred from the claim text.