US1935380A - Method of making a multi-ply bag - Google Patents

Description

Nov. 14, 1933. H. SMITHWICK METHOD'OF MAKING A MULTI-PLY BAG Filed Nov. 1, 1950 2 Sheets-Sheet 1 BY ATTORNEY I INVENTOR MM Nov. 14,1933. H. SMITHWICK METHOD OF MAKING A MULTI-PLY BAG Filed Nov. 1, 1930 2 Sheets- Sheet 2 INVENTQR W Patented Nov. 14, 1933 PATENT OFFICE.

1,935,380" METHOD or MAKING A MULTI-PLY BAG Harold Smithwick,

Continental Paper Scarsdale, N. Y., assignor to & Bag Corporation, New

York, N. Y., a corporation of Delaware Application November 1, 1930. Serial No. 492,705

'7 Claim.

This invention relates to an improved method of making a bag consisting of several layers of material such as an outer relatively tough piece of paper and an inner lining material adapted to protect and preserve the contents of the bag.

In the packaging of certain commodities, particularly food substances, it has been found ,desirable to employ lined bags which permit the use of a strong, tough, and durable material for the exterior of the bag so as to permit it to withstand the necessary handling, while at the same time the interior surface which comes in contact with the food stuff may be formed of a material not sufiiciently durable to withstand the strains in itself but admirably suited to the protection and preservation of the contents. The interior or lining member may, for example, be formed of a relatively thin, waxed, water-proof paper. In the ordinary course of producing a lined bag of this sort the two materials will be glued or otherwise fastened together adjacent the two ends of the tubular member of which the bag is formed. When the bottom of the bag is formed by the usual creasing, cutting and pasting operations, certain folded edges or corners of the two layer material are ordinarily left free on the interior of the bag and are not fastened by glued or otherwise to the bottom wall of'the finished bag. If the bag is employed in this condition for the packaging of granular or powdered substances such as coffee, sugar, flour or the like, it has been found that a portion of the contents works its way under the corners of these folds and out of the bag at a point where the bottom is not completely pasted.

It has been a particular object of the present invention to prevent the leakage of the granular contents of a lined or multi ply bag and toward this end to provide a simple and effective means of securing the folded edges appearing on the inner side of the bottom of the bag to the bottom wall. A further object has been to provide a simple method of producing bags of this sort which may be conducted on a continuous basis. The completed bag may be formedby the present process at a rapid rate from sheet material taken,

for example, from large rolls of the same.

Other objects and advantages of the invention will appear from the detailed description of the same which will now be given in conjunction with the accompanying drawings, in which:

Figure 1 is a diagrammatic view illustrating parts of a machine adapted to carry out a method of forming the improved bag.

Figure 2 is a detail view in plan of a portion of the machine and is taken along the line 2-2' of- Figure 1.

Figure 3 is a detail view of a portion of the lining material.

Figure 4 is a perspective view partly in section of the bottom portion of a bag.

Figure 5 is a bottom view of the completed bag. Figure 6 is a sectional view through the bottom of the bag taken along the line 66 of Figure 4. 5

Figure 7 is a sectional view through the bottom of the bag taken along the line 7-'1 of Figure 4, and

Figure 8 is a view of the bottom of the bag after it has been partially folded but before it has been completely closed. Referring now to the drawings, the bag may be conveniently formed of two separate sheets of material including an outer, relatively tough and durable sheet 10, of paper or the like, and an inner sheet 11 of waxed paper or similar material adapted to preserve and protect the contents of the bag. The two sheets of material are pasted or glued together simply at spaced points, falling at the top and bottom ofeach bag, as will be more fully explained hereinafter, and they are so folded as to form a suitable closed tube of the appropriate length. Preferably the lining material will be offset laterally with reference to the outer bag material so that the two pasted, longitudinal seams which are formed in the production of the tubular element of which the bag is formed are offset with; reference to each other. For example, the lining material may be provided with an overlapping portion 12 constituting a longitudinal, pasted seam adjacent the center of the backwall of the bag while the outer material may have an overlapping portion 13 (Fig. 4) constituting a longitudinal, pasted seam which in the completed bag falls adjacent one corner of the bag.

In the formation of the bag with a bottom'of rectangular shape, the sides of the tube are folded inwardly to provide two portions 14 and 15 which substantially but do not quite meet at the center of the bag to practically close off the bottom. The lower end of the back wall of the bag is folded over along a line 160 (Figure 8) in the form of a flap 16 while the lower end of the front wall of the bag is similarly folded over along a line 1'70 to form a flap 17. The four portions 14, 15, 16 and 17 thus constitute a complete closure for the bottom of the bag. In the normal course of forming the bottom of the bag,

paste is. ordinarilyapplied to an area indicated is provided for each of the other corners.

by the shaded portion 171 in Figure 8. It will be seen that with this arrangement of the paste when the flaps 16 and 17 are subsequently folded over, they will adhere to the'portions 14 and 15 along the lines of the paste. However, the four corners 18, 19, 20 and 21 (Figure 4) provided by the folds of the material which join the portions '14 and 15 of the bottom with the portions 16 and 17 thereof, will not be held by the paste 171 against the bottom wall of the bag constituted by the outer portions 162 and 172 of the flaps 16 and 1'7. These corners in the actual use of the bag have a tendency to lift away from the bottom walls 162 and 172 and permit the passage of the granular material, such as coffee, sugar, flour or the like, into the folds at the bottom and in some instances these granules gradually work their way out of the bag.

The present invention contemplates the provision of suitable means for definitely securing the corners 18, 19, 20 and 21 to the outer walls 162 and 172 of the portions 16 and 17 at the bottom of the bag. For this purpose the lining material 11 at those portions of the bottom walls 162 and 172 of the flaps 16 and 1'7 of the bag which fall directly beneath the corners 18, 19, 20 and 21, or along the side edges 160 and 1'70 of the folds forming these' corners, is perforated or provided with four groups or series of openings 22. Adjacent these openings there is provided a small deposit of paste, glue or similar adhesive material between the lining and outer material of the walls 162 and 1'72 of flaps 16 and 17 of the bag. This adhesive substance in the course of manufacture of the bag is squeezed between the lining and outer material and is exuded from the openings 22 so as to come in contact with the under surface of. the folds forming the several corners 18, 19, 20 and 21. The arrrangement of the openings and deposit of glue is clearly shown in Figure 4 with relation to the one corner 21. It will be understood that a similar constructign T e squeezing of the adhesive material through the openings 22 and against the under surfaces of the folds takes place as an incident to the normal folding and forming operations as carried out on the ordinary types of bag-forming machines now in common use.

It will be understood that in the course of producing the bags the usual crease lines 24 will be formed and the bag will be folded in such a way as to make it lie flat and enable it to be readily packed in bundles for shipment.

In Figures 1, 2 and 3 there is shown in a diagrammatic way a suitable arrangement of apparatus for the continuous production of bags of the type just described. The lining material 11 may be supplied in the form of a continuous sheet of proper width, say 12 inches wide, for a given size of a bag, from a roll 25. This material may be fed around a guide roller 26 and over a suitable rotary paste-applying member 2'7. This member may be provided with a pair of bars extending completely across the width of the lining material and adapted to apply paste at intervals corresponding to the length of the tubes from which the bags are to be formed. The purpose of this paste is to join the lining material to the outer material of the bag at points adjacent the two ends of the tube from which each bag is formed. It is only at these ends that the two separate materials are normally secured together. The paste bars carried by the member 27 may suitably co-operate with a paste-applying roller 28 adapted to be rotated in a bath of paste 29. Upon each rotation of the member 27 the paste bars will be brought into contact with the roller 28 and receive a suitable quantity of paste or other adhesive to be transferred to the under surface of the lining material 11.

After receiving paste along two transverse lines on either side of the line along which the continuous sheet material will be later severed in the production of the separate bags, .the lining material will be fed between a pair of rollers 30 and 31 which are suitably adapted to punch the series of holes 22 which in the completed bag fall in the portions formed by the flaps 16 and 17 but in the flattened sheet are located in a straight line across the sheet as best shown in Figure 2. The punching of the openings through the lining material may conveniently be effected by means of pins 300 carried by the roller 30 cooperating with openings or recesses 310 provided in the lower roller 31. These pins and openings should be so located as to provide four groups of holes in the lining material, one group falling adjacent each edge of the material and two groups falling adjacent the center line of the material. Successive groups of the openings should be spaced at intervals corresponding with the length of the tube from which each bag is formed.

Beyond the rollers 30 and 31 the lining material may be brought into cooperation with another paste-applying member 32 having a series of paste bars or projections 33 spaced transversely across the sheet along an element of the cylinder which forms the member 32. The projections 33, as best shown in Figure 2, should be placed directly in line with the groups of pins 300 which form the series of openings 22. Upon rotation of the member 32 these projections will apply small patches of paste 23 to the under surface of the .31 and the member 32 in accordance with the effective radii of these parts. Paste may be trans-- ferred to the bars 33 by means of a drum 34 rotatably mounted in a bath of paste 35.

Beyond the paste-applying member 32 the lining material may be passed around a suitable guide roller 36. At this point the lining material may be brought into contact with the outer material, which may conveniently be fed continuously from a supply roller 250 in such a way as to be oifset slightly from the lining material indicated in Figure 2. The purpose of this olfset relation between the outer material 10 and the lining material 11 is to place the longitudinal seams of these two materials at different points of the bag tube in the formation of the bag. As previously explained, the lining material in the finished bag is preferably provided with a seam ,passed over a guide roller 37 and then into contact with a paste-applying roller or pair of rollers 38 which are rotatably mounted in a bath of paste 39. The roller 38 is adapted to apply a continuous, longitudinal band of paste adjacent one ers may be provided for this purpose.

and hold the two sheets against the paste-applying roller. 7

From the roller 40 the material may be led downwardly around a suitable form 41 which, in the manner well known in the art, will serve to form a continuous tubular member out of the sheets of material. Rollers 42 may be provided in conjunction with the forming dies to draw the paper tightly around the dies. A pair of draw rolls 43 may be applied in the usual way for assist ing in the feeding of the tube tothe cutting and bottom-forming devices of the machine. Any of the conventional or known forms of cutting and bottom-forming mechanisms may be provided. For example a plurality of chains 44 arranged side by side and adapted to carry a striker bar 440 may be employed in cooperation with a suitable cutting blade for severing the tube, after it has been formed, into lengths appropriate for the production of bags of the desired size. The striker bar 440 for this purpose will act in the usual way against the cutting blade, not shown. If desired, this form of severing mechanism may be replaced by a pair of rotating drums, one of which carries a cutting blade and the other a recess adapted to cooperate with the cutting blade to .thus sever the tube at the desired periodic intervals. Suitable gripping and forwarding rollers 45 adapted to advance the bags through themachine and feed them to the bottom-forming and pasting devices may be provided beyond the severing mechanism.

In the formation of the bottom of the bag, paste may be applied in a band 171 (Figure 8) to the cooperating faces of the portions 14, 15 and 17 by means of any conventional devices, such as the sector 46, which is rotatably 'mounted and adapted to receive paste from a paste pot, not shown. A folder or presser bar 47 carried by a pair of adjacent chains 4'11 may cooperate with the bottom of the bag after the paste has been applied to fold the portions 14, 15;1dand 1'7 in the usual manner and thusr, use the bottom.

In the course of folding arid forming the bottom of the bag, the adhesive material constituting the patches 23 will be squeezed from between the lining member and the outer material of the bag through the groups of holes 22 and will serve to hold the four corners 18, 19, 20 and 21 of the bag against the bottom walls 162 and 172' in the manner previously explained. There is thus provided a continuous process for the production of lined bags having the folds or corners on the inside of the bottom of each bag secured by paste, or other adhesive material, to the outer I bottom wall. of the bag.

While a particular form of bag and a particular method andapparatus for producing the bag have been set forth in some detail, it will be understood that all of the phases of the inven tion aresubject to various modifications without departing from the general spirit and scope of the invention.

What I claim is: j

' 1. A methodof making mined intervals, applying punching holes in v a lined bag which com prises feeding a sheet of outer material and a sheet of lining material from storage rolls past seam pasting and tube vices, applying paste to one of said sheets at intervals representing the beginning and end of a tube which is to constitute a single bag, punching holes in one of said sheets adjacent the bottom end of such substance to one of said sheets adjacent said holes and subsequently bringing the surfaces of said sheets into engagement.

2. A method of making a lined bag which comprises feeding a sheet of outer material and a and bottom forming dea tube, applying an adhesive sheet of lining material from storage rolls around a guide roller in super-imposed relation, punching a series of holes in one of said sheets at predeteran adhesive substance to one of said sheets adjacent said openings, and subsequently forming said sheets into a tube, severing the tube into sections of appropriate lengths adjacent said holes and forming the end of each section carrying the holes into a bag bottom.

3. A method of prises feeding a continuous sheet of outer material and a continuous sheet of lining material in super-imposed relation into cooperation with a longitudinal-seam paste-applying device, punchingholes'in the termined intervals at a point in advance of said device, forming said materials into a continuous tube, severing the tube adjacent said holes into sections of appropriate lengths, forming the end of the tube sections carrying the holes into a bag bottom, applying paste to said bottom, and folding the bottom to seal the same. i

4. A method of making a lined bag which comprises feeding a continuous sheet of outer material and a continuous sheet of lining material in super-imposed relation into cooperation with a longitudinal-seam paste-applying device, forming said materials into a continuous tube, severing the same into sections of appropriate length, punching holes in the lining material at points which will fall adjacent one end of each section prior to formation of the tube; providing paste adjacent said end of each section adapted to pass through said holes, and folding said end of each section to produce a sealed bottom.

5. A method of making a lined bag which comprises feeding a continuous sheet of outer material and a continuous sheet of lining material in super-imposed relation into cooperation with a longitudinal-seam paste-applying device, the lining material prior to reaching said device at predetermined intervals, applying paste to said lining material adjacent said holes, forming said sheets into a continuous tube, severing the tube into sections adjacent said holes and forming the end of each section which carries said holes .into a bag'bottom.

6. T'he method of making multi-ply bags which comprises: perforating one ply of a multi-ply sheet at spaced points; applying an adhesive substance between the plies adjacent to the. perforations; and forming bags from the multi-ply material in such manner as to bring the perforated portions of the one ply into the bag bottoms.

applying pressure to the bag bottoms to squeeze the adhesive through the openings.

HAROLD sm'rnwrcx.

lining material at prede-

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