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US 2016/0214313 A1Published application
Back seam welder and method of operation
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.
Claims20
A method comprising the steps of:
- providing flexible thermoplastic sheet material in a tubular configuration comprising first and second superimposed panels, wherein the second panel includes a first segment and a second segment overlapping the first segment along an overlap region;
- moving the sheet material downstream in the tubular configuration;
- heating the sheet material along the overlap region with a weld heater;
- compressing the first and second panel segments together with a compression mechanism downstream of the weld heater to form a 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 first panel with a weld breaker which extends downstream of the compression mechanism between the welded back seam and the first panel.
3 more elements
Dependencies are inferred from the claim text.