US 4,289,569 AGranted

Manufacture of sealed-end tubular thermoplastic net bagging

OwnerKenneth H. Rabeneck, Jerry R. Kantlehner +1inventors

InventorsKenneth H. Rabeneck, Jerry R. Kantlehner, David E. Gallaher

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Abstract

A tube of thermoplastic netting is drawn through a work station in a radially collapsed, condensed condition. At the work station, the netting is angularly twisted to rope-like form, to increase its bulk density and, in such condition, is drawn between the die and platen of an ultrasonic welding horn. Periodically, the die and platen momentarily bear against a succeeding short length of the twisted, condensed rope-like form making a fused seal nugget integrating all strands of the netting at that site. The resulting product may be a long length of such tubing, having such a seal every so often, or a plurality of bags formed from the intermediate product by making one transverse cut through the netting tube beside each seal nugget.

Claims11

Dependent claims

Apparatus for manufacturing sealed end tubular thermoplastic net bagging from a continuous rope-like feedstock of tubular thermoplastic net bagging material, comprising:

(a) a twisting station;
(b) a sealing station in the vicinity of said twisting station;
(c) means for intermittently axially advancing said feedstock through said twisting station and said sealing station, then pausing;
(d) the twisting station including means for gripping and angularly twisting said feedstock at said twisting station, sufficiently to substantially fully radially condense said feedstock in the vicinity of said twisting station;
(e) the sealing station including melting means for melting an axially short segment of said radially condensed feedstock into a single, massive integral seal nugget incorporating substantially all strands of said feedstock within said segment, said melting means including a support fixture for temporarily supporting said short segment of feedstock during said melting, said support fixture comprising a bar having a slot formed externally therein, part way through the depth and thickness thereof so as to create two outstanding flanges respectively upstream and downstream of said slot, and means providing coaxial openings through both flanges, which openings are disposed to have said feedstock threaded therethrough, so that said segment thereof lies between said flanges;
thereby producing a converted feedstock of tubular thermoplastic net bagging having a respective said seal nugget incorporated therein every so often.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 06/079,526Filed 27 Sep 1979 · division
Priority: 22 Sep 1978
Granted: 15 Sep 1981
Term ends: Not estimatedThe source records don’t support an estimate.

Classification14 codes

B29C 65/08
By heating, with or without pressure: using ultrasonic vibrations
B29C 66/1122
Single lapped joints: single lap to lap joints, i.e. overlap joints
B29C 66/5261
Joining bars: for forming coaxial connections, i.e. the bars to be joined forming a zero angle relative to each other
B29C 66/73921
Characterised by the material of at least one of the parts being a thermoplastic: characterised by the materials of both parts being thermoplastics