Device for opening a tubular bag and its application

Abstract

Device for opening a tubular bag with a blade attached to an inserting tube, wherein the blade is equipped with at least one edge for lancing the tubular bag and with at least one edge for cutting the tubular bag and the shape of the blade is aligned to the inner wall of the outlet for the material contained in the bag.

Description

[0001] The invention concerns a device for the opening of a tubular bag and also for its application. BACKGROUND OF THE INVENTION [0002] In the dental field, particularly, pastes of varying consistencies are offered in tubular bags with increasing frequency. In doing so it is necessary to guarantee a simple, clean and safe application for the consumer. [0003] For this purpose the tubular bags are combined with opening mechanisms as have been described already in EP 787 655 (=U.S. Pat. No. 6,012,610), EP 1 121 195 (=U.S. Pat. No. 6.394.643), EP 1 227 049 (=US 2002 / 0113089). However, the known mechanisms have certain disadvantages depending on the consistency of the products in these tubular bags. [0004] EP 787 655 describes a device, wherein the bag stretches out under pressure beyond its original shape, before it bursts due to a device arranged behind the top plate. The disadvantage of this system, particularly in the case of multi-component paste systems, is that a paste can be hel...

AI Technical Summary

Benefits of technology

[0013] In a convenient design form one or several bars connected to a toothed wheel in the channel prevent the twisting of the tube when the bag is being pierced or is pierced. DETAILED DESCRIPTION

[0014] It proves to be advantageous that the inserting tube and the blade are made of different materials, namely, the tube is made of a sealing material and the blade is made of a sturdy material. Furthermore, it is advantageous if the blade has at least two pointed tips that are connected by a slanting or bent cutting edge. The blade preferentially creates a non-linear opening in the foil of the tubular bag by which the resistance for viscous pastes can be kept low.

[0035] However, because the part for lancing the bag must always be pointed, sharp and stiff, the risk of injury by the pointed plug can be avoided if the bag is pierced during the manufacturing process and subsequently sealed with a plug without a pointed tip, which then can be pulled off and can be disposed of safely by the user. This would shift the application of the device according to the invention at hand completely to the manufacturer's side.

Problems solved by technology

However, the known mechanisms have certain disadvantages depending on the consistency of the products in these tubular bags.

The disadvantage of this system, particularly in the case of multi-component paste systems, is that a paste can be held back temporarily until this bag bursts open under partly high pressure and the paste, particularly in the case of freely flowing pastes, spills over, until the pressure is counter-balanced.

However, in the application of pastes with very high viscosity and very poor ability to flow freely, the blade 1 (of FIG. 3) attached to the flow channel causes a disturbed flow resistance in the case of this enlarged bottle opening.

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