GB2161448A - Packing articles, such as packages of rolls of paper, in bags - Google Patents

Abstract

A pack comprises a bag (1) of thermoplastic film, such as polyethylene, containing individual packages (13) of rolls of paper, such as packages of four rolls of toilet tissue, and a closure panel (35) inserted in the bag to engage the contents; the bag having a marginal lip (15a, 15b, 15c) at its mouth folded over on the outside face of the closure panel and heat-sealed thereto to close the bag. A method of making such packs involves inserting the contents and the closure panel into the bag through its mouth, and folding over the lip and heat-sealing it to the panel. For use in the method a ram (39) is provided for pushing the contents and closure panel into the bag while the latter is supported in a frame (25) and has its mouth held open by an expansible horn (21, 23). Pivoted to the frame are folding bars (43, 44) for turning in the marginal lip of the bag against the closure panel. Heated sealing members act on said marginal lip through notches in the folding bars. <IMAGE>

Description

SPECIFICATION Packing articles, such as packages of rolls of paper This invention relates to the packing or bundling of articles for storage and shipment, and more particularly to the packing or bundling of articles such as packages of rolls of paper, e.g., packages comprising four rolls of toilet tissue wrapped in plastic film, or rolls of paper toweling.

The assignee of this invention has for some years supplied to the paper industry in Europe machinery for accumulating a number of rolls of toilet tissue or household paper toweling and overwrapping the rolls in a wrapper of polyethylene film, as an economic alternative to packing the rolls in cartons or cases of corrugated paperboard.

The stated overwrap method is not a viable method for the USA, however, because US producers of rolls of toilet tissue and paper toweling require that the wrapped bundle have an identical configuration to the existing corrugated case, that it be printed on all four sides, and that it be able to go through existing handling systems, including automatic palletizing and automatic warehousing and d-warehousing which require the use of optical scanners to read pre- printed pre-positioned codes. The U.S. carton configuration is substantially larger than that in Europe, and is close to being a cube. This has made modification of the assignee's existing overwrapping equipment to meet the requirements of the U.S. paper industry well-nigh impossible.

Among the several objects of this invention may be noted the provision of a mode of packaging rolls of paper in plastic film instead of in corrugated cases which meets the requirements of the US paper industry; the provision of a package or bundle or rolls utilizing a plastic bag, e.g., a polyethylene bag, in which the rolls are tightly bundled; and the provision of such a package or bundle which is adapted for stacking of packages or bundles one on top of another, and which is slip-resistant for maintenance of the packages or bundles in stacks.

In general a package or bundle of this invention comprises a bag of flexible packaging material which is heat- sealable at least on the inside, product in the bag, a closure panel in the bag on the product at the mouth of the bag, the panel being heat-sealable at least on its outside face, the bag having a marginal portion or lip at the bag mouth all around the bag projecting beyond the panel and folded over on the outside face of the panel and heat sealed thereto.The method of the invention generally involves loading the bag with product through the mouth of the bag and inserting the closure panel with its other face on the inside and lying against the product and its heat-sealable face facing the outside and with said marginal portion or lip of the bag projecting beyond the panel, folding said marginal portion or lip over on the heatsealable face of the panel and heat sealing it thereto.

Other objects and features will be in part appar ent and in part pointed out hereinafter.

Figure 1 is a view showing a bag used in the in vention separated from a continuous series of bags; Figure 2 is a view in section showing product comprising a collation of packages and an end clo sure panel in position for being entered in a bag through a horn which has spread the bag open at its mouth; Figure 3 is a view similar to Figure 2 showing the packages and end closure panel entered in the bag; Figure 4 is a view on line 4-4 of Figure 3; Figure 5 is a view similar to Figure 3 showing the horn withdrawn from within the bag and a marginal portion or lip of the bag at its mouth projecting beyond the end closure panel folded over on the outside face of the panel, this view also being generally in section on line 5-5 of Figure 7; Figure 6 is a view in section on line 5-5 of Figure 5;; Figure 7 is a view similar to Figure 4, showing the folding over of the marginal portion or lip of the bag at the bag mouth on the outside of the end closure panel; Figure 8 is a view similar to Figure 7 showing the folded-over marginal portion or lip of the bag being heat-sealed at intervals to the outside face of the end closure panel; Figure 9 is an enlarged section on line 9-9 of Figure 8; Figure 10 is a perspective of the package or bundle comprising the bag, product and end closure panel with the stated marginal portion or lip of the bag folded over on and heat-sealed at intervals to the panel; and Figure 11 is a view similar to Figure 10 showing the sealing completed to be continuous all around the folded-over marginal portion or lip.

Corresponding reference characters indicate corresponding parts throughout the several views of the drawings.

Referring to the drawings, there is indicated at 1 a bag of flexible packaging material which is heatsealable at least on the inside, and which in general is a polyethylene bag comprising a length of gussetted polyethylene tubing closed at one end constituting its bottom end by a heat seal as indicated at 3 extending completely across the bag and open at its other end constituting its mouth end 5. The gussets of the bag, which are indicated at 7, are relatively deep so that the bag, when packed as will appear, approaches the shape of a cube.It is contemplated that the bags will be supplied in a continuous series, formed by providing the bag bottom heat seals 3 across continuous gusseted polyethylene tubing T at bag length intervals (see Figure 1), with lines of weakness 9, e.g., lines of perforations, extending transversely across the tubing adjacent each bag bottom heat seal 3 for tearing each bag away from the tubing, the open mouth of each bag occurring at the end of the torn-off bag opposite the heat-sealed bottom end.

Product indicated generally at 11 in Figures 2-6 is packed in the bag in a manner to be described. As herein illustrated, the product 11 comprises a set or collation of twenty-four packages 13 of rolls R of toilet tissue, each of these twenty-four packages comprising four rolls of toilet tissue arranged in two side-by-side rows of two rolls each, with the two rolls in each row arranged end-to-end, the four rolls being wrapped in polyethylene. Such four-roll packages of toilet tissue, which are widely sold in the U.S.A., generally measure nine inches long, nine inches wide (at the widest) and four and onehalf inches deep (each roll R generally being of four and one-half inch diameter and being four and one-half inches wide).The twenty-four packages are arranged as illustrated in Figures 2-5 in four layers, each layer comprising six packages arranged in three side-by-side rows with two packages arranged end-to-end in each row. Thus, the stack 11 of the twenty-four packages in section transverse to the bag is generally rectangular, and measures generally eighteen inches endwise, twenty-seven inches widthwise and eighteen inches heightwise. Its girth, indicated at G in Figure 4, is generally eighty-five inches. The bag 1 has a girth corresponding to the girth of the stack for a tight fit of the stack in the bag, and has a length, (in its Figure 1 unpacked condition) of about thirty inches, which provides for a marginal portion or lip 15 of the bag at the bag mouth projecting about three inches beyond the end of the stack at the bag mouth when the stack is fully inserted in the bag.

Referring to Figure 2, the bag 1 is shown as having been opened for loading the stack 11 of packages 13 in the bag by applying the mouth end 5 of the bag to means indicated generally at 17 for spreading the bag open at its mouth and gripping it to enable pushing or ramming the stack into the bag. As illustrated, this means 17 includes an expansible and contractible horn comprising top and bottom plates or platens 19 and 21 and side plates or platens each designated 23 adapted to be moved between a contracted position for slipping the bag over the platens and an expanded position for spreading the bag open at its mouth, and a surrounding rectangular frame structure generally designated 25 against which the bag is gripped by the expanded horn platens.The horn platens, when expanded, may stretch the bag slightly thereby fully to open it, and may have flared entrance edges as indicated at 27 to guide the stack into the bag. The frame structure 25 is shown as having a top 29, a bottom 31, sides each designated 33 and an end 34, the latter being engageable by the bottom of the bag when the stack is inserted in the bag.

With the bag applied to the horn platens 19, 21, 23 and with these platens spread outwardly and gripping the bag against the top 29, bottom 31 and sides 33 of the frame structure 25, the stack 11 of packages 13 together with a closure panel 35 are inserted in the bag through the spread-open mouth 5 of the bag. As shown, the closure panel comprises a piece of relatively thin sheet material, such as heavy paper (40-80 pounds per ream) or linerboard (100-140 pounds per ream) having generally the same shape as the shape of the end of the stack, i.e., generally rectangular with arcuate corners, and measuring about 27 inches wide and eighteen inches high for the stack of twenty-four package as herein described, with a coating 37 of heat-sealable material, e.g., polyethylene, on one face of the panel constituting its outside face.The closure panel is applied flat against the outer end of the stack with its heat-sealable face 37 on the outside, and the stack and the panel are pushed or rammed into the bag through the loading horn arrangement formed by the platens 19, 21, 23 to the point where the leading end of the stack engages and spreads out the bottom of the bag, and the trailing end of the stack with the closure panel 35 flat against it are spaced inwardly from the mouth end of the bag the distance, e.g., three inches, provided for by use of a bag long enough for this purpose relative to the length of the stack. With the closure panel 35 thus spaced inwardly from the mouth end of the bag, the bag has the marginal portion or lip at its mouth as indicated at 15 projecting beyond the panel as shown in Figure 3.

The stack 11 and panel 35 are pushed into the bag 1 by means of a ram 39 having a head 41 of sufficiently smaller outline than the panel 35 to allow the top portion 15a, the bottom portion 15b and the side portions 15c of the lip 15 of the bag to be folded over into face-to-face engagement with the outside heat-sealable face 37 of the closure panel. Thus, for example, the head 41 of the ram may be of rectangular form measuring about twenty inches wide and eleven inches high, allowing about three and one-half inches all around the head for the folding over of the three inch top, bottom and side portions 15a, 15b, 15c of the projecting three-inch lip 15 of the bag.

To facilitate the bag loading operation, the bag may be expanded by blowing air into it. As the stack is pushed into the bag, with the bag spread and gripped by the horn platens 19,21 and 23 at its mouth, the stack expands the bag to some extent so that the stack is tightly confined in the bag. The stack engages the bottom of the bag which in turn engages the end 34 of the frame structure 25 for some compression of the stack by the head 41 of the ram against the end 34 of the frame structure.

While maintaining the ram head 41 pressing against the end closure panel 35 and maintaining the stack under some compression in the bag, as illustrated in Figure 5, the horn platens 19, 21, 23 are withdrawn from within the bag to allow the portion of the bag which had been spread out by the horn platens to contract into engagement with the stack (and the peripheral edge of the end closure panel 35) and to allow for the folding over of the top, bottom and side portions 15a, 15b, 15c of the projecting three-inch lip 15 of the bag at its mouth. These marginal portions 15a, 15b, 15c are then folded over around the top, bottom and side edges of the closure panel 35 into face-to-face engagement with its outside heat-sealable face 37.

The folding is by means of folding members at the top, bottom and sides of the mouth end of the frame structure 25, these members being illustrated as bars pivoted at the mouth ends of the top, bottom and sides 29, 31 and 33 of the frame structure 25, the top folding bar being designated 43, the bottom folding bar being designated 45 and each of the side folding bars being designated 47.

Each of the folding bars 43,45 and 47 is formed with notches as indicated at 49 for entry of heated sealing members designated 51 for pressing the folded-over margins 15a,15b,15c of the bag against the heat-sealable outside face 37 of the end closure panel and heat-sealing the margins thereto at spaced intervals around the panel 35 adjacent its periphery. The sealing is in the nature of spot sealing, the sealing members 51 being shaped to form elongate spots 53 (e.g., four inches long and an inch wide). The sealing is carried out with the ram head 41 pressing against the end closure panel 35 and maintaining the product 11 in the bag under some compression, whereby the closure of the bag by the sealed-in-place end closure panel is completed to form the package indicated at P in Figure 10 with the product tightly encompassed by the bag and the end closure.The package P, comprising the bag, product and end closure panel, may also be referred to as a bundle or bale; the bag may be referred to as a baler bag.

Following the spot sealing operation, the spot sealing members 51 are withdrawn, the folding bars 43,45 and 47 are retracted, the ram head 41 is retracted, and the package, bundle or bale P completed to the point where the margins 15a, 15b, 1 sic of the bag at the mouth of the bag are folded over and heat-sealed to the heat-sealable outside face 37 of the end closure panel by the spot seals 53 is removed from the frame structure 25. The discontinuous seal formed by the spot seals 53 may then be made continuous throughout the folded-over margins 15a, 15b, 15c as shown in Figure 11, where the continuous seal is designated 55, in a separate heat-sealing operation, thereby completely to seal the package P to protect its contents.

The coating 37 on the outside face of the end closure panel 35 may cover the outside face completely and may be made such as to have anti-slip characteristics (e.g., made somewhat rough) so that bundles stacked one on another with the nonslip coating 37 of the panel 35 of one bundle engaging another bundle will resist slipping relative to one another. It is also contemplated that, if desirable, the coating 37 may be made with a slip characteristic so that bundles may slide easily relative to one another. If neither of these characteristics is wanted, the coating need not cover the entire face of the end panel 35, but may be limited to a band around the panel adjacent its periphery.

In view of the above, it will be seen that the several objects of the invention are achieved and other advantageous results attained.

As various changes could be made in the above constructions and methods without departing from the scope of the invention, it is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.

Claims (15)

1. A package comprising a bag of flexible packaging material which is heat-sealable at least on the inside, product in the bag, a closure panel in the bag on the product at the mouth of the bag, said panel being heat-sealable at least on its outside face, said bag having a lip at the bag mouth all around the bag projecting beyond said panel and folded over on the outside face of the panel and heat sealed thereto.

2. A package as set forth in claim 1 wherein the bag is a heat-sealable plastic bag and the closure panel comprises a piece of material having a coating of heat-sealable plastic on its outside face.

3. A package as set forth in claim 2 wherein the product comprises a plurality of rolls of paper.

4. A package as set forth in claim 2 wherein the product comprises a plurality of packages of rolls of toilet tissue.

5. A package as set forth in claim 2 wherein the product in section transverse to the bag and the panel are generally rectangular, the bag is relatively tight around the product, and has four marginal portions folded over around the four sides of the panel on the outside face of the panel, each of the four marginal portions being heat sealed to the coating on said outside face of the panel.

6. A package as set forth in claim 5 wherein the heat sealing is continuous throughout the said four folded-over marginal portions to seal the package.

7. A package as set forth in claim 2 wherein the coating generally covers the entire outside face of the panel and has a non-slip characteristic for nonslip of packages in a stack.

8. A package as set fourth in claim 2 wherein the coating generally covers the entire outside face of the panel and has a slip characteristic for facilitating sliding of the package.

9. The method of packaging comprising loading a bag of flexible packaging material which is heatsealable at least on the inside with product through the mouth of the bag and inserting a closure panel which is heat-sealable on one face thereof in the bag through the mouth of the bag with its other face on the inside and lying against the product and its said heat-sealable facing the outside with the bag having a lip projecting beyond the panel, and folding said lip over on the said heat-sealable face of the panel and heat sealing it thereto.

10. The method of claim 9 in which the bag is a heat-sealable plastic bag and the closure panel comprises a piece of sheet material having a coating of heat-sealable plastic on its outside face, the lip of the bag being heat-sealed to said coating.

11. The method of claim 10 wherein the bag is spread open at its mouth, and the product and the end closure panel are simultaneously pushed into the bag through its mouth, compression being maintained on the panel and the product while the lip of the bag is folded over on the outside face of the panel and heat sealed to the coating on said face.

12. The method of claim 11 wherein the product in section transverses to the bag and the panel are generally rectangular, the product and bag are dimensioned for a relatively tight fit of the product in the bag, the lip comprises four marginal portions of the bag which are folded over around the four sides of the panel on the outside face of the panel, and each of the four marginal portions is heat sealed to the coating on said outside face of the panel.

13. The method of claim 12 wherein the four marginal portions are heat-sealed to the panel at intervals while compression is maintained on the panel and product.

14. The method of claim 13 wherein the folding over of the marginal portions is effected by folding members having gaps therein and the heat sealing is effected by entering heat sealing members in the gaps.

15. The method of claim 13 wherein the sealing of the margins to the outside face of the panel is subsequently made continuous throughout the marginal portions.