FOLDING METHOD AND APPARATUS FOR BASKET-STYLE ARTICLE CARRIERS

Abstract: A method of forming a basket-style carrier in which a securing strip (16d) provided at a free end portion of a base panel (16) of the carrier is inserted into a space (42) created between a side wall (14a) and partition panels (14d) associated therewith so that the securing strip is secured to an inner face of that side wall internally of the carrier.

Description: This invention relates to a method and apparatus for folding an article carrier of the so-called basket type by which an edge portion of the base panel of such a carrier is secured to an internal face of a side wall of the carrier. Normally a basket-type article carrier has a base panel which includes an edge portion comprising a securing strip of material hinged to an adjacent part of the base panel and to which glue is applied. During folding of the carrier blank to form the article carrier in collapsed condition the base panel is folded about a central fold line and the securing strip brought into overlapping relationship and secured to the external surface of a side wall of the carrier. Thus, the securing strip is exposed to view, interrupts the continuous external surface of the side wall and therefore can detract from the printed appearance of the carrier side wall. Such an article carrier is disclosed in European Patent No 0,017,430 the disclosure of which is hereby incorporated by reference. The present invention seeks to improve the appearance of a basket-style article carrier by a modified folding and gluing process in which the securing strip is secured to an internal face of a carrier side wall and hidden from view. The invention provides a method of forming a basket-style article carrier from a partially formed carrier in collapsed condition which includes a first carrier part comprising one side wall of the carrier and internal partition panels associated therewith and a second carrier part comprising an opposite side wall of the carrier and internal partition panels, associated therewith, the carrier further including a base panel and a securing strip provided by the base panel associated with the first carrier part which method is characterised by moving the partially formed carrier along a feed path in which the first and second carrier parts initially are disposed substantially in the plane of the feed path, folding said second carrier part across said feed path towards said first carrier part and folding said base panel together with said securing strip in an opposite direction across said feed path towards said second carrier part and manipulating said second carrier to move into superposed relationship with said first carrier part and so that a space is created between said opposite side wall and the internal partition panels associated therewith, causing the securing strip to be inserted into said space while said securing strip and said second carrier part are in a raised attitude and thereafter causing the securing strip to be adhered to an inner face of said opposite wall while the completed carrier is in flat collapsed condition. An embodiment of the invention will now be described, by way of example, with reference to the accompanying drawings, in which:- FIGURE 1 shows schematically components in a feed path of a folding and gluing machine for effecting an initial folding operation of a part-formed article carrier; and FIGURE 2 shows schematically further components of the machine in the feed path for effecting further folding operations on the part-formed carrier. In Figures 1 and 2, a partially formed carton blank 'B' for forming a carton of the basket-type is conveyed along a feed path 'F' and subjected to sequential operations in a continuous folding and gluing process. For the purpose of this description only those parts of the carton relevent to the fabricating process of this invention are identified and described. In Figure 1, the partially formed carton blank is shown already formed into a condition in which it comprises a pair of similar parts relative to a central fold line 10 of the blank. For simplicity, these parts will be referred to as lower part 12 and upper part 14. The lower part carries a base panel 16 of the carrier which constitutes the major difference between the upper and lower parts. Lower part 12 comprises a side wall panel 12a to which is hinged an end wall panel 12b of one end of the carton about a fold line 12c. Likewise, upper part 14 comprises the opposite side wall panel 14a of the carton to which is hinged an end wall panel 14b of the same one end of the carton about fold line 14c. Superimposed upon the side and end wall panels of the lower part 12 are a number of further carton panels which include transverse and medial partition panels generally depicted by reference numeral 12d, handle structure 12e and an end wall panel 12f of the opposite end of the carton. Similarly, superimposed upon the side and end wall panels of the upper part 14 are a number of carton panels which include transverse and medial partition panels generally depicted by reference numeral 14d, handle structure 14e and an end wall panel 14f of the said opposite end of the carton. The base panel 16 comprises panel portions 16a and 16b integrally hinged about an intermediate fold line 16c and a securing strip panel 16d hinged integrally to base panel portion 16b about fold line 16e. Referring now specifically to Figure 1, the part-formed carton blank 'B' is shown schematically in position 1 at which all the panels are lying substantially flat in a horizontal plane, the blank being conveyed in the direction of feed path 'F'. Within the feed path between positions 1 and 2, a flat elongate guide strip 18 is disposed such that it overrides the base panel portion 16b but is clear of the securing strip 16d of the carton. A folding bar 20 is provided alongside guide strip 18 so that the securing strip of the base panel is directed between guide strip 18 and folding bar 20. The folding bar 20 is shaped so as to fold the securing strip upwardly about fold line 16e out of the plane of the remainder of the base panel during forward movement of the blank. This initial folding step raises the securing strip to an extent such that an obtuse angle is subtended between the securing strip 16d and base panel portion 16b which facilitates a subsequent folding operation described later. The blank has now moved through positions 1 and 2 of Figure 1. Referring now specifically to Figure 2, feed path 'F' is flanked by a pair of movable parallel endless belts 22, 24 respectively, which move in synchronism with a carton in the feed path. Intermediate the parallel belts are a flat elongate guide strip 18a (which can be an extension of strip 18) adjacent belt 22 and a pair of fixed folding bars 26, 28 respectively, adjacent belt 24. Immediately prior to position 3 illustrated, the upper part 14 of the carton enters the space between the folding bars while in a horizontal plane. The folding bars are shaped so that by the time the carton reaches position 3, the upper part 14 progressively has been raised by folding about central fold line 10 into an upright altitude relative to lower part 12. Guide strip 18a is positioned so as to bear against base panel portion 16a while base panel portion 16b is disposed between strip 18a and belt 22. At each of the upstream and downstream ends of position 3 a roller 30 and 32, respectively is located which bear against belt 22. Roller 30 is set with its axis of rotation horizontal whereas the axis of rotation of roller 32 is vertical thereby to maintain a twist in the belt from a horizontal to a vertical plane between positions 3 and 4. Thus, as the base panel portion 16b moves along the space between guide strip 18a and belt 22 it is folded upwardly about fold line 16c into an upright altitude at position 4. The opposing belt 24 however is in an upright attitude through position 3 and located against upper part 14 of the carton adjacent fold line 10. Also between positions 3 and 4, folding bars 26 and 28 extend downwardly and transversely of the feed path while also gradually becoming more closely spaced together. At position 3 an application of glue is made to specific areas of the panels 12d, 12e, and 12f, as is well known in the art. The orientation of the folding bars causes the upper part 14 of the carton to fold downwardly about fold line 10 towards the horizontally disposed lower part 12 as the carton moves from position 3 to position 4. Belt 24 is twisted out of a vertical plane at position 3 into a horizontal plane at positions 4 and 5, the twist being maintained by a set of in-line rollers 34 at position 5. The rollers of set 34 all have their axes of rotation in a horizontal plane with the rollers bearing downwardly onto belt 24. As a result of the twist, induced by roller set 34, belt 24 remains in a similar position in relation to the upper portion 14 of the carton even though the upper portion is folded downwardly during transfer from position 3 to position 4 because the belt 24 is caused to adopt a more horizontal position between positions 3 and 4. Thus belt 24 applies pressure in a direction towards the feed path onto the fold line 10 which tends to move apart the side wall 14a and end wall 14b from the adjacent internal partition panels 14d provided that the upper carrier part 14 is supported by folding bar 28 at a location spaced from the free end of the carton part 14 so that a space 42 is created between side wall 14a and the adjacent internal partition panels 14d. If necessary, an appropriate folding element (not shown) may be introduced between side wall 14a and the adjacent internal partition panels 14d to prise those panels apart and encourage the creation of space 42. Belt 22 is maintained vertical throughout position 4 by the cooperation of roller 32 and a further roller 36 disposed at the downstream end of position 4 at which location the guide strip 18a terminates. Thereafter, belt 22 again is twisted progressively into a horizontal plane through position 5 by spaced rollers 38 and 40 the former having its axis of rotation inclined to the horizontal while the latter has its axis of rotation disposed in a horizontal plane. This second twist in belt 22 causes base panel portion 16b together with integral securing strip 16d to be folded downwardly and inwardly relative to the feed path between positions 4 and 5. The downward and inward folding of base panel portion 16b is accompanied by like folding of the upper part 14 of the carton. This is achieved by the continuous convergence and transverse deflection of the folding bars 26, 28 until the folding bars are almost in superposed relationship centrally of the feed path at position 5. Here fold bar 28 extends beneath the folded over upper part 14 of the carton while fold bar 28 extends above upper carton part 14. Fold bar 28 terminates at the downstream end of position 5. An application of glue is made to the outer exposed face of the securing strip during its passage through position 4. Thereafter, as the upper part 14 and the securing strip are folded downwarly towards one another their folding paths interfere such that securing strip 16b is inserted into the space 42 present between the adjacent edge of side wall 14a and the underlying transverse and medial partition panels 14d. This occurs during transference of the carton from position 4 to position 5. Insertion of the securing strip 16b is facilitated first in that the pre-folding earlier referred to puts the securing strip into substantially co-plannar relationship with side wall 14a immediately prior to insertion of the strip into space 42 and secondly in that the leading edge of the securing strip is backwardly raked to avoid snaring of the panels. It will be seen that throughout position 5, the fold line 10 at the handle area of the carton and fold line 16c at the base panel of the carton run beneath roller sets 34 and 38/40. These rollers momentarily hold upper part 14 and base panel 16b in a mutually elevated attitude by virtue of a piercer-like effect which is created by the downward force of the roller sets. As the carton passes through position 5, upper part 14 and base panel 16b are lowered together and in so doing move towards one another so that securing strip is fully and smootly inserted into the space 42. The carton subsequently passes through compression rollers so that all the glued areas are firmly adhered including the adhesion of the securing strip 16d to the inner face of side wall 14a.

Claims: A method of forming a basket-style article carrier from a partially formed carrier (B) in collapsed condition which includes a first carrier part (12) comprising one side wall of the carrier and internal partition panels associated therewith and a second carrier part (14) comprising an opposite side wall of the carrier and internal partition panels associated therewith, the carrier further including a base panel (16) and a securing strip (16d) provided by the base panel associated with the first carrier part (12) which method is characterised by moving the partially formed carrier along a feed path (F) in which the first and second carrier parts initially are disposed substantially in the plane of the feed path, folding said second carrier part (14) across said feed path towards said first carrier part (12) and folding said base panel (16) together with said securing strip (16d) in an opposite direction across said feed path (F) towards said second carrier part (14) and manipulating said second carrier (14) to move into superposed relationship with said first carrier part (12) and so that a space is created between said opposite side wall and the internal partition panels associated therewith, causing the securing strip (16d) to be inserted into said space while said securing strip (16d) and said second carrier part (14) are in a raised attitude and thereafter causing the securing strip (16d) to be adhered to an inner face of said opposite wall while the completed carrier is in flat collapsed condition. A method according to claim 1, further characterised by applying pressure in a direction towards the feed path (F) onto a folded connection between said first and second carton parts (12,14), so as to create said space between said opposite side wall and the partition panels associated therewith to receive said securing strip (16d) and to maintain the second carton part (14) and said base panel portion in said raised attitude to facilitate insertion of the securing strip (16d) into said space. A method according to claim 1, further characterised by bringing said second carton part (14) and said base panel portion having the securing strip (16d) into an upright attitude relative to said first carton part prior to said folding of said second carton and said securing strip and applying an adhesive to selected areas of said first carton part and to said securing strip. A method according to claim 1, further characterised in that said securing strip (16d) initially is folded relative to the base panel portion to which it is hinged so that an obtuse angle is subtended between said securing strip and that base panel portion.

Inventors: BAKX, MARTINUS
Applicants: THE MEAD CORPORATION
Application year: 1987
Main classification: B31B5
IPC codes: B31B3, B31B1, B31B5