Plastic closure device for tubular bags

Abstract

A plastic closure device (1) with a lower part (2) is disclosed which can be fastened in a non-releasable and integrally bonded manner by means of ultrasonic welding to a plastic film or a plastic patch. A flange (20) of the lower part (2) is connected by an underside thereof to the plastic layer in an integrally bonded manner by means of introducing ultrasonic energy of a sonotrode into the flange (20). An energy-introducing arrangement, comprising a plurality of energy-introducing ribs (23), is used to introduce the ultrasonic energy into the flange (20), as a result of which the weld parts are welded under the action of a static joining force. Owing to the design according to the invention of the energy-introducing arrangement, a desired connection can be achieved in spite of a reduced static joining force, a reduced ultrasonic energy and, in general, with the use of a reduced welding power by comparison with prior art methods.

Description

BACKGROUND OF THE INVENTION[0001]The present invention describes a plastic closure device for tubular bags, having a bottom part, comprising a discharge outlet and a flange having a flange bottom side on which there is disposed an energy-introducing arrangement which can be connected to a plastic layer by means of ultrasonic welding.[0002]Plastic closure devices for tubular bags, which in technical language are generally referred to as pouches, are known in different embodiments.[0003]The plastic closure devices generally comprise a bottom part, fastened directly on the tubular bag, and a screw cap, releasably fastenable on the bottom part, for closing off a discharge outlet in the bottom part. For the fastening of the plastic closure device, a flange of the bottom part is fastened on the plastic film material of the tubular bag in a non-releasable, integral manner by ultrasonic welding. This welded joint is realized either directly between the flange bottom side and the plastic fil...

AI Technical Summary

Benefits of technology

The present invention provides a plastic closure device that can be fastened on tubular bags with lower static joining forces, amplitudes, welding energies, and overall welding powers. This leads to a more cost-effective fastening of each individual device, resulting in billions of dollars of savings worldwide.

Problems solved by technology

Depending on the application and loading of the tubular bag, this achievable strength is insufficient.

The drawback of a structured anvil is the possibility that bacteria will hide in the structured surface, or that the structure of the anvil will damage the plastic film of the tubular bag, including next to the welding point.

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