Piercing blade temperature control
AssigneeUnion Carbide Corporation
InventorWalter V. Marbach
Life of this patent
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Abstract
A sheet piercing blade used to form perforate separation lines across continuous strip partible flattened tubular plastic film packaging bags is maintained a preselected optimum operating temperature by a heat transfer fluid medium circulating through a duct in substantially contiguous contact with the blade, a heat exchanger, and conduits connecting the duct and the heat exchanger.
Claims1
In an apparatus for forming continuous strip separable packaging bags with a heat seal bar to form bag bottom seals, a heated bag material piercing blade, and a heat source to provide heat for said blade, the improvement of blade temperature lowering and stabilization apparatus comprising, in combination, a fluid-tight duct mounted in heat transfer relationship contiguously with said blade, heat exchanger means independent and separate of the heat source which provides heat for said blade adapted to conduct heat from said blade and said duct, conduit means operably connecting said duct and said heat exchanger means, a fluid heat transfer medium in the duct and the heat exchanger means, and pump means arranged and disposed to continuously circulate said fluid heat transfer medium through the duct, the conduit means, and the heat exchanger means,
- whereby the piercing blade is maintained substantially at a preselected bag material annealing temperature.
Dependencies are inferred from the claim text.