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US 2019/0152162 A1Published application
Thermoplastic bag produced with a back seam welder
AssigneeMiller Weldmaster Corporation
InventorBrian D. Henry
Life of this patent
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Abstract
A thermal welder is configured to weld a back seam of a bag formed of thermoplastic sheet material. The welder may include a weld heater and a compression mechanism downstream of the weld heater to compress the sheet material to form the back seam. The welder may also include a weld breaker downstream of the compression mechanism to break apart incidental welds which are formed adjacent the back seam.
Claims14
A thermoplastic bag produced by a method comprising the steps of:
- providing flexible thermoplastic sheet material having a longitudinally extending first edge segment and an opposed longitudinally extending second edge segment;
- forming an overlap region in the sheet material by placing the first edge segment over and beyond the second edge segment;
- forming the sheet material into a tubular configuration comprising first and second superimposed panels, wherein the second panel includes the overlap region, and the overlap region overlays a portion of the first panel;
- moving the sheet material downstream;
- heating the sheet material along the overlap region with a weld heater;
- compressing the first and second edge segments together with a compression mechanism downstream of the weld heater to form a longitudinally-extending welded back seam extending along the overlap region;
- and
- as the sheet material is moving downstream in the tubular configuration, breaking incidental welds extending between the welded back seam and the portion of the first panel overlaid by the welded back seam with a weld breaker which extends downstream of the compression mechanism between the welded back seam and the first panel.
5 more elements
Dependencies are inferred from the claim text.