WO2002083506A1

WO2002083506A1 - An apparatus for opening and closing packages

Info

Publication number: WO2002083506A1
Application number: PCT/SE2002/000661
Authority: WO
Inventors: Jan Jostler; Ingemar Brodén
Original assignee: Joker System Ab
Priority date: 2001-04-06
Filing date: 2002-04-04
Publication date: 2002-10-24
Also published as: EP1379436A1; EP1379436B9; EP1379436B1; DE60203792D1; SE0101261L; SE518917C2; DE60203792T2; ATE293567T1; SE0101261D0

Abstract

An apparatus for opening and closing packaging blanks (pockets) disposed in a web in sequence after one another. The apparatus has mechanical retainer means (33a, b) which are disposed, on the displacement of a flexible web (20) along said mechanical retainer means, to guide retainer means (13a, b; 43a, b; 53a, b) disposed at said web. The same includes at least one part where the mechanical retainer means (33a, b) are disposed in spaced apart relationship from one another in order to keep the packaging blanks open. Moreover, the apparatus includes mechanical guide means (35, 36) which guide the opposing edge portions (24a, b) of the web (20) on their displacement to and from that part of the apparatus where the packaging blanks are moved open. The guide means (35) are disposed in order, in said part, to position the edge portions (24a, b) of the web (20) in relation to one another so that the packaging blanks are opened and closed, respectively. The mechanical guide means (35, 36) are flexible either in a first plane with the aid of the mechanical retainer means (33a, b) or in a plane which is parallel to the first plane, the guide means (35, 36) being substantially inflexible in a plane which is at right angles to said first plane.

Description

AN APPARATUS FOR OPENING AND CLOSING PACKAGES

The present invention relates to an apparatus and a method for opening and closing packaging blanks (pockets) disposed in sequence after one another in a web, according to the preambles to the independent claims.

There is a need in the art for an apparatus and a method for opening pockets (packaging blanks) disposed in a web in sequence after one another in order to supply contents to the pockets and to close them after the filling.

Patent specification EP 0 958 193 describes a web comprising packaging blanks disposed in sequence after one another and an apparatus for opening and closing the packaging blanks. The web has longitudinal first and second edges and a first wall opposing a second wall. Transverse slots are provided between the side closures of the packaging blanks. Each respective wall is provided along the above-mentioned second edge, with retainer means for co-operation with mechanical devices which guide edge portions of the web when this is moved along the mechanical devices. In each packaging blank, each one of the walls is provided with a longitudinal slot, the slot of the first wall departing from the transverse slot at the one side closure of the packaging blank and the slot of the second wall departing from the transverse slot at the second side closure of the packaging blank.

The apparatus includes those mechanical devices which are disposed in spaced apart relationship from one another in that part of the apparatus where the packaging blanks are moved opened and are disposed adjacent one another where the packaging blanks are moved closed.

The apparatus shown in EP 0 958 193 employs mechanical guide means which displace the edge portions of the web in relation to one another in the longitudinal direction of the web in order to open and close the packaging blanks. The technique illustrated in the patent specification entails that there is required a certain adaptation between the dimensions of the mechanical guide means and the extent of the blanks in the longitudinal direction of the web in order that the desired opening and closing of the blanks may take place without problems occurring. This requirement on adaptation of the dimensions entails that the mechanical guide means must, as a rule, be replaced by other guide means of other dimensions before the apparatus can be employed for a web with blanks of a different size in the longitudinal direction of the web. It is therefore obvious that there is a need in the art for a technique which does not require such adaptation. There is also a need to be able simply to adapt the configuration of the openings of the opened packaging blanks (the pockets) depending upon the requirements which are placed by the contents which are to be supplied to the pockets.

The present invention relates to a web and an apparatus for supplying contents to packaging blanks included in the web, where the above-outlined drawbacks have been obviated and the above-disclosed needs/wishes have been satisfied. This is attained by the technique which is disclosed in the characterising clauses of the independent claims.

The subclaims relate to expedient embodiments of the present invention.

The present invention will be described in greater detail hereinbelow with reference to a number of figures, in which:

Fig. 1 is a perspective view of a portion of a web according to the present invention with the retainer means of the web designed as material thickened portions; Fig. la shows the section A-A in Fig. 1 ;

Fig. lb shows the section B-B in Fig. 1;

Fig. lc shows the section C-C in Fig. 1;

Fig. 2 is a side elevation of a portion of the web according to Fig. 1 with both walls of the web abutting against each other; Fig. 2a-c are the sections A-A, B-B and C-C in Fig. 2; Fig. 3a is a section corresponding to the section B-B in Fig. 1 with a different design of the thickened portions of the web;

Fig. 3b is a section corresponding to the section B-B in Fig. 1 with a third retainer means disposed along the web; Fig. 3c is a section corresponding to the section B-B of Fig. 1 with an inwardly folded bottom of the web;

Fig. 4 is a schematic view in perspective of a filling device and a web located in the filling device;

Fig. 4a is the section A-A in Fig. 4; Fig. 4b is the section B-B in Fig. 4;

Fig. 5 is a view in perspective of one embodiment of the filling device and the web according to Fig. 1;

Fig. 6 is a view in perspective of a guide chain including a mechanical guide member; Fig. 6a is a magnified detailed view of the guide chain in Fig. 6;

Fig. 6b is a cross section through a linkage in the guide chain in Fig. 6;

Fig. 7 is a view in perspective of a chain-like device including a mechanical guide member;

Fig. 7a is a magnified detailed view of the chain-like device of Fig. 7; Fig. 7b is a view in perspective of a linkage in the chain-like device in Fig. 7;

Fig. 7c is a detailed view of a linkage in the guide chain in Fig. 7;

Fig. 8, 8a show in perspective a row of mechanical retainer means in one embodiment of a mechanical guide member; and

Fig. 8b is a side elevation of a linkage in the mechanical guide member according to Fig. 8.

Figs. 1 - 3 show embodiments of a continuous web 20 of flexible material, as a rule plastic material or similar material. The term "similar material" is taken to signify any material whatever of such properties that a web of the material is suitable to be employed in the application of the invention described herein. The web displays two opposing walls 21a,b, hereafter also referred to as first wall 21a and second wall 21b and first (lower) and second (upper) edges 22, 23, respectively located in the longitudinal direction of the web, the web further including a number of packaging blanks or pockets 26 disposed in sequence after one another. The pockets each have a bottom portion 15 at the above mentioned lower edge 22 and two connection zones or joints 25a,b, transversely directed in relation to the longitudinal direction of the web and occasionally referred to as transverse zones 25 or transverse joints 25 which form the side closures 25a,b of the pockets.

In the figures, the web is generally shown in embodiments where the opposing walls 21a,b directly merge into one another in that the walls are double-folded in the bottom portions 15 of the pockets in order to form the bottom of the pockets. It will be obvious that, in other embodiments, both walls of the pockets form, as illustrated in Fig. 3c, an inwardly folded bottom in order to widen it, or are connected to one another for example by a weld joint which also forms the lower edge 22 of the web. Between the joints of two adjacent pockets 26, there is a transverse slot 27 which defines the pockets from one another.

Each respective wall 21a,b includes two opposing edge portions 24a,b which extend in the longitudinal direction of the web at its above mentioned upper edge 23. Each one of the edge portions includes a continuous retainer means 13a,b; 43a,b, hereafter generally designated the retainer means 13a,b; 43a,b of the edge portion. The retainer means 13a,b; 43a,b of the edge portions co-operate with mechanical retainer means 33a,b (cf. Fig. 4a and 4b) for guiding the edge portions 24a,b on displacement of the web 20 into a device 3 for supplying contents to the pockets 26. In the embodiments illustrated in Figs. 1, lb, lc, 2, 2a-c and 3a-c, the retainer means of the edge portions are designed as thickened material portions 13a,b; 43a,b, while in other embodiments they may be designed as tunnels. The mechanical retainer means are in such instance designed so as to be located inside the tunnels when the web passes through the filler device. Figs. 3a,b show one embodiment of the material thickened portions of the web where the material thickened portion 43a of the one wall 21a is provided with a groove 72 oriented in the longitudinal direction of the web, and the material thickened portion 43 b of the second wall 21b is provided with a bead 71 oriented in the longitudinal direction of the web. The bead and the groove form a male and female part which fit tightly in one another and are preferably of a form which realises a snap connection. Figs. 3a,b also show an embodiment where the web is provided with belt-like wall portions 14a,b above the thickened portions 43a,b.

Fig. 3b also shows an embodiment of the web where a second retainer means 44 is disposed in the region of the first edge 22 of the web. The second retainer means is principally intended to be employed for retaining the package formed from the packaging blank in connection with its emptying.

Fig. 3c shows one embodiment where the bottom portions 15 of the pockets 20 form an inwardly folded fold (bottom fold) 12 directed towards the openings of the pockets.

In its end region located most proximal the retainer means 13a,b; 43a,b, the transverse slot 27 merges in a longitudinal slot 29a in the first wall 21a directed to the right in the figures and in the second wall 21b in a longitudinal slot 29b directed to the left. The longitudinal slots are located under the retainer means 13a,b; 43a,b of the edge portions.

Reference numerals 28a,b relate to those material portions of the web in which the opposing walls of the web are connected to one another for closing the filled packaging blanks, e.g. by welded joints. In certain applications, the connection of the walls takes place in a region beneath the slots 29a,b, while in other applications the fusion together takes place in the region of the slots 29a,b. On fusion of the slots, a satisfactory and tight connection is obtained because of the fact that, at each slot, the wall which is opposed to the slot is whole (lacks a slot). A satisfactory and tight fusion together takes place close to the second (upper) edge of the web, whereby material consumption for each package which is filled and closed is reduced to a minimum.

Figs. 4 - 5 show one embodiment of a filling device 3 (Fig. 4) in which a web is displaced in the direction of the arrow A along the mechanical retainer means 33 of the filler device. Fig. 4 shows how the pockets of the web are opened and closed when the web passes through the filler station 3. It will be apparent from Fig. 4 that mechanical guide members 35, 36 are provided for leading (guiding) the opposing walls of the web from each other in order to open the pockets and then guide back the walls to a position adjacent one another for closing the opened pockets once the contents has been supplied to the pockets. The guide members are shown in simplified form in figure 4.

Fig. 4a shows a packaging blank (pocket) 26 which is suspended in mechanical retainer means 33 with a channel 31 in which the retainer means 13a,b of the edge portion of the web are located. The lower side of the channel is provided with a gap 34 with a gap width which prevents the retainer means 33 of the edge portion from passing but which permits both walls of the web to pass. The pocket 26 is shown in the unopened state.

In Fig. 4b, the pocket 26 is opened and the retainer means of each respective edge portion are inserted in separate channels 3 la,b of mechanical retainer means 33a,b which are located in spaced apart relationship from each other. Each respective wall 21a,b of the web passes through a gap 34 in the lower region of the mechanical retainer means. The gap has a gap width which prevents the retainer means of the edge portion from passing. As a rule, the mechanical means are oriented such that the web depends down through the gaps 34 of the mechanical means 33 during movement along them. Another orientation of the mechanical means and of the web is employed in other practical applications of the present invention. Fig. 5 shows in perspective an apparatus including the first mechanical retainer means 33a and the second mechanical retainer means 33b. These means are disposed parallel with each other. In the illustrated embodiment, the second mechanical retainer means 33b is fixed to the frame of the apparatus, while the first mechanical retainer means 33a is moveable in relation to the second mechanical retainer means while retaining parallel orientation.

Fig. 5 shows one embodiment in which the first mechanical retainer means is provided with two arms 37 located in spaced apart relationship from one another and oriented substantially at right angles to the longitudinal directions of the means. The arms each one in their groove 38 which are disposed in means which are rigidly connected to the frame of the apparatus. The arms are provided with fixing devices for locking the arms in set positions in the grooves. By movement of the arms, the distance between the mechanical retainer means is adjusted. As a rule, the arms are moveable in relation to the first mechanical retainer means 33a in order to modify the position of the first mechanical retainer means in the longitudinal direction of the apparatus in relation to the position of the second mechanical retainer means in the longitudinal direction of the apparatus. The arms are also provided with fixing devices for locking the positions of the arms on the first mechanical retainer means 33a.

It will be apparent from the figures that, on entry into the filling device 3, the mechanical guide means 35 guides the retainer means 13a, 43a of the edge portion of the first wall 21a of the web so as to travel a longer distance than the retainer means 13b, 43b of the edge portion of the second wall 21b of the web. At the same time, the retainer means of the edge portions are displaced away from one another to a greater distance which is determined by the distance between the mechanical retainer means 33a,b, the pockets being opened. The openings which are formed between the edges of the opening consist of rectangles, as a rule parallelograms. The angles which are formed between the edges of the opening of each pocket are determined by the distance between the mechanical retainer means of the filler device, the size of the longer distance which the edge portion had been moved and any possible displacement of the first mechanical retainer means 33a in relation to the second mechanical retainer means 33b in the longitudinal direction of the apparatus.

On exit from the filler device, the retainer means 13b, 43b of the edge portion of the second wall 21b is guided by the mechanical guide means 36 to travel a longer distance than the retainer means 13a, 43a of the edge portion of the first wall 21a of the web. The longer distance the retainer means 13a, 43a, 53a of the front wall 21a is displaced during the entry into the filler device is compensated for by the shorter distance which the retainer means of the front wall is displaced on exit. This implies that both walls 21a,b of the web after exit of the web from the filler device assume the same relative positions in the longitudinal direction of the web as before entry into the filler device. As a result, the sought-for effect will be achieved that the opposing walls of the pockets, after exit from the filler device, assume positions where they are no longer displaced in relation to one another in the longitudinal direction of the web. As a result, on the displacement out of the filler device, the walls 21a,b of the web 20 are moved to positions adjacent one another, i.e. to positions in which a reliable and unobjectionable closure of the pockets takes place in that the walls 21a,b are connected in the material portions 28a,b.

It will be obvious that the size of the openings of the packaging blanks may readily be adapted to pertinent needs by displacement of the mechanical retainer means 33a,b away or towards one another, the distance being adapted to the length of the longitudinal slits of the web and the configuration which it is desired that the openings of the packaging blanks will have on supply of the contents. The alteration of the distance need not take place in one step but may be selected and adjusted to an optional value within the range in which the apparatus is dimensioned to operate. The design of the mechanical guide means 35, 36 entails that the above desirable effects are attained since the length of the mechanical guide means is maintained unchanged on adjustment of the distance between the mechanical retainer means. The relative displacement of the mechanical retainer means in the longitudinal direction of the apparatus also afford a possibility of influencing the configuration of the openings.

Figs. 6, 6a-b show a second embodiment of the mechanical guide means 35, 36 where they are included in guide chains 133 including mechanical retainer means 33 for the web, while Figs. 7, 7a-c show a third embodiment of the mechanical guide means 35, 36 where the mechanical guide means 35, 36 are included in a chain-like device 233. The chain-like device is provided with linkages 200 which are supported and united by a belt 201 which is rigid in the vertical direction but flexible in the horizontal direction and which passes along the entire length of the chain-like device through holes 202 which are provided in the linkages 200.

As will be apparent from Fig. 6a and 6b, the mechanical retainer means 33 of the guide chain have through-going holes 130 which are oriented in the longitudinal direction of the guide chain. A rope-like solid device of elastic material e.g. rubber passes through the holes throughout the entire length of the chain. The rope-like device directs the mechanical retainer devices so that, for each mechanical retainer device between two surrounding mechanical retainer devices, the channel 31 and the gap 34 disposed in the lower region of the retainer device are kept directed towards the channel 31 and the gap 34 of the two surrounding mechanical retainer devices. As a result, a reliable passage for the web 20 will be ensured with the packaging blanks also when the disposition of the guide chain is altered.

In a simple variation of the guide chain according to Fig. 6, 6a,b, the guide chain 133a is formed solely by the mechanical retainer means 33 and the rope-like device 131.

Figs. 8, 8a-b show one embodiment of the apparatus where the mechanical guide means 35, 36 are formed by a row 333 of mechanical retainer means 33 disposed with relative short spacing between one another. The retainer means are connected with one another by means of a relatively thin and flexible material portion 301. The distance between the retainer means, the dimensioning of the flexible material portion and the material in it are selected such that the row of retainer means may be bent in the horizontal direction but not bent in the vertical direction. As a result, the desired effect will be attained that the mechanical guide means 35, 36 are to be flexible in a first plane with an orientation which substantially corresponds to the plane through the mechanical retainer devices 33a,b or in a plane substantially parallel with said first plane, and that the guide means are substantially inflexible in a plane at right angles to said first plane.

Figs. 8a-b illustrate the possibility of producing the row 333 of retainer means in two steps. In the first step, that part of the row which is shown in Fig. 8a is formed, and in the second step the remaining part is formed which, after the formation, is united with the first part. In an alternative manufacturing cycle, the remaining parts of each retainer means are formed as separate parts which, after the formation, one by one are fixed to the part illustrated in Fig. 8a.

A further advantage with the novel technique is that the embodiment of the filler device illustrated in the figures makes it possible to continuously adapt the distance between the straight edges and also continuously adapt the relative positions of the straight edges in the longitudinal direction of the apparatus. As a result, the apparatus is capable of opening and closing the packaging blanks in the web when the length of the blanks in the longitudinal direction is very short and also when it is very long, and in addition the apparatus is adjustable to open and close all blanks of length within the range between the short and the long length. In other words, the design of the apparatus entails that it may be dimensioned so as to be able to open and close pockets of a web regardless of their size, and that only practical grounds determine the limits of the sizes of the pockets of the web which a special apparatus is to be able to open and close.

In the foregoing description, the designations upper, lower, right, left, vertical, horizontal, etc. have occasionally been employed. These designations have merely been employed to facilitate the presentation of the invention. It will be obvious to a person skilled in the art that the described technique generally permits any optional orientation of the web in space.

The foregoing detailed description has referred to but a limited number of embodiments of the present invention, but it will be readily perceived by a person skilled in the art that the present invention encompasses a large number of embodiments without departing from the scope of the appended claims.

Claims

1. An apparatus (3) provided with mechanical retainer means (33a,b), where the mechanical retainer means (33a,b) is disposed, on the displacement of a flexible web (20) along said mechanical retainer means, to guide retainer means (13a,b; 43a,b; 53a,b) disposed at the web, where the apparatus includes at least one part where the mechanical retainer means (33a,b) are disposed in spaced apart relationship from one another in order to keep the packaging blanks open, where the apparatus includes mechanical guide means (35, 36) which guide the opposing edge portions (24a,b) of the web (20) on their displacement to and from that part of the apparatus where the packaging blanks are displaced open, where said guide means (35) is disposed, in said part, to position the edge portions (24a,b) of the web (20) displaced in relation to one another in the longitudinal direction of the web, and where said guide means (36) is disposed, on displacement of the edge portions (24a,b) to positions adjacent one another, to eliminate said displacement, characterised in that the mechanical guide means (35, 36) are flexible in the first plane through the mechanical retainer means (33a, b) or in a plane parallel with said first plane; and that said guide means (35, 36) are substantially inflexible in a plane at right angles to said first plane.

2. The apparatus as claimed in claim 1, characterised in that the mechanical guide means (35, 36) are formed from a chain; and that the links of the chain are provided with passages through which the web is displaced.

3. The apparatus as claimed in claim 1, characterised in that the mechanical guide means (35, 36) are formed from a row of mechanical retainer means (133a) which are disposed in spaced apart relationship from one another; and that said retainer means are interconnected with one another by means of a rope-like solid device (131) of elastic material, e.g. rubber which permits a certain flexibility of the device.

4. The apparatus as claimed in claim 3, characterised in that each mechanical retainer means (133a) is provided with abutment surfaces turned to face towards adjacent retainer means; and that abutment surfaces on two adjacent lead disposed retainer means in an unflexed guide means, are disposed in spaced apart relationship from one another which entails that the bending of the mechanical guide means (35, 36) in the plane at right angles to said first plane is restricted to a predetermined maximum flexing.

5. The apparatus as claimed in claim 1, characterised in that the mechanical guide means (35, 36) are formed from a row of mechanical retainer means (133b) which are disposed in spaced apart relationship from one another; and that said retainer means are interconnected with one another by means of a relatively thin belt which permits said flexibility and said inflexibility.