EP0815025B1

EP0815025B1 - Packaging container

Info

Publication number: EP0815025B1
Application number: EP96909417A
Authority: EP
Inventors: Hans Linner
Original assignee: Norden Pac Development AB
Current assignee: Norden Pac Development AB
Priority date: 1995-03-31
Filing date: 1996-03-19
Publication date: 1999-02-03
Anticipated expiration: 2016-03-19
Also published as: ES2129262T3; DE69601496T2; JPH11504593A; EP0815025A1; AU5291896A; ATE176436T1; SE9501169D0; SE9501169L; DE69601496D1; SE508438C2; WO1996030272A1

Abstract

The invention relates to containers, especially to single-dosage rectal tubes. To eliminate return after squeezing with ensuing pump/suction effect, the tube body is divided into two part-walls with relatively different wall thicknesses. The part-wall with the larger thickness serves as a support for the thinner part-wall and the thickness relationship prevents return to the original shape.

Description

The invention relates to a packaging container and more particularly to a container which is emptiable by means of squeezing. The invention especially relates to a single dosage tube, suitable for rectal use amongst other things.

The state of the art in this field covers a number of particular plastic tube concepts. One such concept is based on conventional tube technology, where a tube body manufactured by extrusion is heat-sealed to an emptying spout. By making the attachment part of the emptying spout of thinner material, normally by means of injection moulding, in the area thereof which is to be fixed to the container part, which area more to the worse is only able to be reduced in thickness to a limited extent for technical reasons, an attempt is made at achieving a maximum degree of emptying. The idea is that a complete emptying (evacuation) of the product in the packaging will be achieved by squeezing the tube body and said connection portion of the emptying spout.

Another concept is based on forming the tube body semi-spherically and the "breast portion" of the emptying spout in a correspondingly complementary shape. Emptying of the product in the tube occurs by means of the container body being pressed in towards the breast portion.

In DK 156 415 there is a flexible tube design based on a specific curvature radius of the tube breast with a restriction to certain material densities.

DK 103 686 discloses a semi-rigid two piece container where the product containing space partly is defined by a flexible thin wall.

The first-mentioned solutions to the problem of emptying of the product in the tube however have the drawback that some of the tube bodies present a return tendency as soon as they cease to be forcibly held in place.

This tendency to return back to the original shape of the tube body results in the occurrence of a suction effect or pumping effect, meaning that in practice the intended purpose of achieving complete emptying of the tube cannot be solved in a satisfactory manner. Even when the tube body is completely squeezed together, a certain amount of product remains in the emptying spout. The problem however is that this remaining product is not able to flow out before the suction occurs and the remaining product is conveyed back into the tube body.

Other known solutions (for instance DK 156 514) are restricted to a limited number of tube materials in order to give deadfold characteristics. Still another solution (DK 103 686) is based on a semi-rigid container body.

The object of the present invention is to overcome the problem of the sucking-back of the product and provide a solution without the prior art restrictions.

To meet this object, a container is provided having the structure defined in claim 1.

The invention also provides a method of manufacturing containers as defined in claim 1.

The invention will now be exemplified and additionally clarified with reference to the accompanying drawings, in which:

Fig. 1: is a side view of a tube, in the present case a rectal tube, in accordance with the invention,
Fig. 2: is a view in a direction at 90° relative to that in Fig. 1,
Fig. 3: is a view from above of the tube in Fig. 1,
Fig. 4: shows the tube in Fig. 1 in a compressed state,
Fig. 5: is a side view of a second embodiment of the rectal tube,
Fig. 6: is a view from above of the tube in Fig. 5, and
Fig. 7: is a longitudinal cross-sectional view, through the central axis of the tube in Fig. 5.

The tube in Fig. 1 comprises a container body 10 and an emptying/evacuation spout 11. The container body or the tube body 10 as well as the emptying spout 11 are injection moulded as an integral unit of thermoplastic material, for example of polyethylene or polypropylene. An imaginary separation line between the spout and the body is positioned at the level indicated by the dashed line 12. The emptying spout is, in its external form, of the usual type for rectal tubes and thus has an encircling groove 13 which defines the introduction depth in certain applications. Internally, at the level 12, there is no welded transition between the body and the spout, which allows an optimal formation of the transition area.

The tube body 10 has

container body halves

14 and 15 of different wall thicknesses. The

halves

14, 15 are defined by a plane of symmetry through the central axis 16 of the container and first and second part-

walls

17, 18 respectively, of the container body.

In the embodiment according to Figs. 1 to 4, the shape of the container body is oval, in accordance with that which is shown in Fig. 3. The thickness of the part-wall 17 is considerably less than that of part-wall 18, the ratio lying in the range of about 1:2-1:6. This thickness ratio means that the part-wall 18 constitutes a fixed support wall for the thinner part-wall 17 after the part-wall 17 has been pressed into the position shown with dashed lines in Fig. 4. In a similar position, there is insufficient return tension-energy in the thinner part-wall 17 for the part-wall to return to its original shape after the pressing force has been removed.

In the shown embodiment, the

partial walls

17, 18 have individual single (constant) wall thicknesses over the whole area thereof. The injection moulding technique proposed in accordance with the invention however also allows the possibility of achieving a partial reduction in the wall thickness, e.g. in the area along the borderline 19 which separates the container body halves. In this way, it should be possible to form a reduced wall thickness presenting a hinge joint along the whole borderline 19, or parts thereof.

The bottom seal 20 of the tube in Figs. 1 - 4 can be made in different ways, for example by means of a hot air sealing technique.

In the embodiment shown in Figs. 5 - 7, reference numerals have been used corresponding to those in Figs. 1 - 4, however with the addition of an apostrophe.

The tube in Figs. 5 to 7 has a tube body 10' with a basic circular shape. Additionally, the extent of the reduced thickness wall 17' has been lengthened up into the breast area 21 of the emptying spout 11'. This is shown by the dotted line 22.

The intention of this is to achieve an even more complete emptying than that which is achieved by the embodiment in Figs. 1 - 4.

Claims

Container, comprising a container body (10) and an emptying spout (11) joined therewith, wherein the container body externally presents symmetry with respect to at least a plane through a central axis (16) of the container body, and wherein the plane of symmetry and a first part-wall (17) of the container body define a first flexible container body half (14), and the plane of symmetry (16) and a second part-wall (18) of the container body define a second flexible container body half (15), a first one of said container body halves having a homogenous wall thickness, characterized in that the second container body half has a homogenous wall thickness which is less than said homogenous wall thickness, and in that said container body half with the lesser thickness has a portion (22) which forms a part-wall of the emptying spout, such that the container body and the part-walls of the emptying spout present deadfold characteristics after emptying the container by squeezing the container body halves.
Method of manufacturing containers as in claim 1 comprising an open-ended container body to be closed after filling and an emptying spout joined therewith, whereby the container body externally presents symmetry with respect to at least a plane through a central axis of the container body, and whereby the plane of symmetry and a first part-wall of the container body define a first flexible container body half, and the plane of symmetry and a second part-wall of the container body define a second flexible container body half, characterized in that the container body and the emptying spout are injection moulded in one piece so that the part-walls have relatively different, homogeneous wall thicknesses, and so that the part-wall with the lesser thickness is given an extent such that it also forms a part-wall for the emptying-spout.