GB2052952A

GB2052952A - Foldable baking tins and other containers

Info

Publication number: GB2052952A
Application number: GB8015706A
Authority: GB
Original assignee: Huggle & Meurer KG
Current assignee: Huggle & Meurer KG
Priority date: 1979-05-10
Filing date: 1980-05-12
Publication date: 1981-02-04
Also published as: EP0019783A3; DE2918814A1; DE2918814C2; EP0019783B1; GB2052952B; EP0019783A2; ATE10570T1

Abstract

A foldable baking tin with a bottom (2) and side (3) and end (4) walls extending from it, which is cut from a web of cardboard with a coating of aluminium foil facing towards the interior of the tin. Outside the interior of the baking tin a folding tongue (6) of the bottom is folded up against the outer surface of the adjoining flaps, and the folding tongue consists of a central portion (9) with a gripping tab (8), and lobes (10) present on each side of the central portion and separable from it, which latter are connected with the flaps (5) by zones of opposed tear lines (14, 18) enclosing an angle. <IMAGE>

Description

1 GB2052952A 1

SPECIFICATION

Foldable baking tins and other containers The invention relates principally to foldable baking tins with a bottom and also side and end walls extending from it, which is cut from a web of material having, facing towards the interior of the tin, a layer for contact with the baked product, especially of a cardboard with a coating of aluminium foil, and the material web in turn is folded at predetermined lines. The end walls may include flaps of the side walls connected together.

Baking tins of this kind are usual in commerce and are possibly associated with sales packages of prepared baking mixturesfolded into a flat transportable piece in order to facilitate baking for the housewife. For this purpose the baking tin is unfolded, filled with the baking material which may still require to be mixed, and put into the oven. In order then to be able to remove the cake from the baking tin when ready, the walls must be at least partially released. People have tried this by employing an adhesive between its flaps and a flange bent around their upper edge, which is released by the heat of the baking process. According to experiments the adhesive releases too soon-the baking tin fails apart in the oven, or not all, which greatly hinders the opening of the baking tin.

Furthermore, the manufacture of such baking tins is relatively complicated.

There is to be considered as a further 100 drawback, that edge strips which are present on the side wall of this baking tin and can be bent along a perforation, which are bent from the side walls in the ready-for-use condition and should enhance their stiffness, revert un der the influence of heat from the bent posi tion into the plane of the side wall and thus permit their bulging.

In view of these circumstances the inventor has set himself the target to provide a baking tin of the kind mentioned initially, which reli ably maintains its shape during the baking process and at the end of it can be easily released from the baking material. In addition this tin should be able to be manufactured in a simple manner and thus a particularly economical one.

What leads to solution of this object is that outside the interior of the baking tin a folding tongue of the bottom is folded up against the outer surface of the adjoining flaps, and the folding tongue consists of a central portion with a gripping tab, and lobes present on each side of the central portion and separable from it, which latter are connected with the flaps which form the interior wall of the baking tin.

Preferably the central portion of the folding tongue, which contracts upwards towards the gripping tab extending beyond the upper edges of the flaps and of the wings, should be so separable from the lobes by opposed tear lines, that on each of the parts to be separated a strip remains corresponding to the spacing of the tear lines.

Thanks to these measures, the end wall of the baking tin remains closed throughout the entire baking process; the opening of the end wall occurs exclusively by the deliberate sep- aration of central portion and lobes in the zone of the so-called opposite tear lines. The lobes are connected with the flaps of the side walls-possibly indeed by an adhesive over a large surface area-and this is independent of the ruling temperature. Naturally other possibilities of connection can be employed here, which would be entirely unthinkable with the baking tin described above and usual in commerce.

Since during experiments with baking tins according to the invention it has been shown that the opening system for an entire container wall by means of a gripping tab and socalled opposed tear lines extending from both sides of it and enclosing an angle between them-thus defining a tapered area-is quite generally very advantageous, separate protection is requested for this, viz. a container with a multi-layer wall which is to be subdivided or separated from other container parts, characterised in that its surface has a separating tongue or the like, possibly tapered, which is connected at each side with the remaining wall parts by zones of so-called opposed tear lines enclosing an angle.

Preferably each zone of opposed tear lines is produced by two tear lines running substantially parallel and spaced apart, each of which is introduced with slight depth of impresion in a different surface of the tongue-like flap or wall.

It has appeared particularly favourable that each lobe has an outer edge extending from the bottom of the baking tin and roughly parallel to its tear lines, which passes through a transition at a weakened place into an upper outer edge facing the side, which terminates about at the upper edge of the neighbouring side wall. This permits the largest possible area of connection of the parts of the material web producing the end wall and overlapping each other. These however, thanks to the construction according to the invention, can be separated easily so far from one another that the baking tin walls are able to be folded apart.

In order, with side walls with edge strips which can fold around, to resist their reversion under influence of baking heat, a tear line is provided, in a particularly advantageous manner, in the side walls, extending roughly parallel to the bottom, near or at the upper edge of the side wall, which cuts through the contact layer, that is in particular an aluminium foil.

Further advantages, features, and details of GB2052952A 2 the invention appears from the following description of a preferred embodiment and with reference to the drawing; this shows in: Figure 1 an oblique view of a baking tin. 5 Figure 2 a section through Fig. 1 on its line

Figure 3 a detailed section through the baking tin roughly corresponding to the line 111-111 in Fig. 2.

Figure 4 an oblique view of a part of the baking tin in altered condition.

Figure 5 the plan of a half of the blank for manufacture of a baking tin.

A baking tin 1 according to the embodi- ment shown in Fig. 1 consists of a bottom 2 of length a of for example 250 mm and of breadth b 70 mm, two side walls extending inclined to one another at an angle w, of height h of about 75 mm, and also two end walls 4. The plane of symmetry for the shape is determined by the centre lines M, N of the baking tin 1.

Each end wall 4 is constituted by two flaps 5 each of which is connected with a side wall 4 along a fold line 20, and a tongue-like flap 6, which joins on to the bottom 2 along a fold line 21. This tongue 6 extends by a dimension i beyond the upper edge 7 of the side wall 4 as a gripping tab 8. This tongue 6 consists of a central portion 9 tapering upwards towards the gripping tab 8 and two lobes 10 joining on at each side. Each lobe has a constriction 11 at about half its height k (Fig. 2), up to which---considered from the bottom 2-its outer edge 12 extends roughly parallel to the external tear line 14 defining each central portion 9, and from there upwards the upper edge portion 13 is directed outwards to the upper edge 15 of the side of the baking tin. Along each of these one can see two narrow edge strips 16, 17. The fold line between these two is indicated at 22.

All components described are cut out unitarily from a web of material, which consists of a layer 29 of cardboard with rolled-on aluminium foil 30. The latter forms the contact layer directed towards the interior (2 of the tin, which shapes the baking material, not shown.

As can be seen from Figs. 2, 3 and 4, the external tear line 14 described between the 2. A container according to claim 1, in the central portion 9 and the lobes 10 of the form of a foldable baking tin for a baking tongue 6 is impressed in the card layer 29, material with a bottom and also side and end and thus does not damage the aluminium foil walls extending from it, which is cut from a 30. An internal tear line 18 made in the latter 120 web of material having, facing towards the extends parallel thereto at a spacing e to form interior of the tin, a layer for contact with the an opposed tear line. baked product, especially of a cardboard with If now one pulls on the gripping tab 8 of a coating of aluminium foil, and the material the central portion 9 in the direction of the web in turn is folded at predetermined lines arrow x, the latter, according to Fig. 4, is so 125 characterised in that outside the interior of the separated from the lobes 1 0-totally adhered baking tin a folding tongue of the bottom is (area F) with the flaps 5-that a strip 19 of folded up against the outer surface of the aluminium foil 10 and a thin layer of the adjoining flaps, and the folding tongue con cardboard 29 remain on them. The two strips sists of a central portion with a gripping tab 19 extend over the entire height of the end 130 and lobes present on each side of the central wall 4.

Fig. 5 shows one half of a blank up to the line of symmetry 23 of the blank. In addition to the fold lines 15, 20, 21, 22 already described, there are here also to be seen fold lines 24 and 25 extending from the baking tin corners E-running diagonally into the side walls 3 over the peripheral strips 16, 17, and which terminate in the outer edge strip 17 at different distances m, n from the line of symmetry 23, which also is a fold line.

The fold lines 23 to 25-in contrast to the fold lines 15, 20 or 22--servenot for manufacture of the baking tin 1, but for folding it up into an article for shipping. For this purpose the edge strips 16, 17 are folded back into the plane of the side wall 3, and the wall portions of the erected baking tin 1 defined by the diagonal fold lines 24 or 25 are folded in a direction y. The remaining parts of the side walls 3, with the end walls 4 attached to them, then fold together in the direction of the arrow z Thereafter both the halves of the tin-hinged around the line of symmetry 23---can be folded together.

This flat article for shipping is then before its use unfolded in the reverse manner, whereby there is formed a baking tin 1 ready for use. To improve the wall stiffness, the edge strips 16, 17 are folded through at least 90' to 18.0 out of the plane of the side wall 3.

In order to resist a reversion of the edge strips 16, 17, under the influence of the baking temperature and a tension in the aluminium foil 30 caused thereby, a tear R is incorporated in the aluminium foil in each case near the edge or fold line 15 at the upper end of the side wall 3, cutting through the said foil.

Claims

1. A container witha multi-layer wall which is to be subdivided or separated from other container parts, characterised in that its surface has a separating tongue or the like, possibly tapered, which is connected at each side with the remaining wall parts by zones of so-called opposed tear lines enclosing an an- ale.

W 3 GB2052952A 3 1 15 portion and separable from it, which latter are connected with the flaps which form the interior wall of the baking tin.

3. A container according to claim 2, characterised in that the end walls may include flaps of the side walls connected together.

4. A container according to claim 2 or claim 3, characterised by a central portion of the folding tongue, attached to the bottom of the baking tin, which contracts upwards towards the gripping tab extending beyond the upper edges of the flaps and of the wings, and is so separable from the lobes by opposed tear lines, that on each of the parts to be separated a strip remains corresponding to the spacing of the tear lines.

5. Container according to any of claims 1 to 4, characterised in that two tear lines running substantially parallel and spaced apart serve as opposed tear line, each of which is introduced with slight depth of impression in a different surface of the tongue-like flap or wall. -

6. Container according to any of claims 1 to 5, characterised in that the lobes of the folding tongue are permanently adhered over a large surface area to the adjoining flaps of the side walls.

7. Container according to any of claims 1 to 6, characterised in that each lobe has an outer edge extending from the bottom of the baking tin and roughly parallel to its tear lines, which passes through a transition at a weakened place into an upper outer edge facing the side, which terminates about at the upper edge of the neighbouring side wall.

8. Container according to any of claims 1 to 7, with edge strips which can fold round, joined on to the side walls at their upper edge, characterised in that a tear line is provided in the side walls, extending roughly parallel to the bottom, near or at the upper edge of the side wall, which cuts through the aluminium foil or other corresponding contact layer.

Printed for Her Majesty's Stationery Office by Burgess & Son (Abingdon) Ltd.-1 98 1. Published at The Patent Office, 25 Southampton Buildings, London, WC2A 1AY, from which copies may be obtained.