US2987858A - Method of closing bag tube ends - Google Patents

Method of closing bag tube ends Download PDF

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Publication number
US2987858A
US2987858A US810072A US81007259A US2987858A US 2987858 A US2987858 A US 2987858A US 810072 A US810072 A US 810072A US 81007259 A US81007259 A US 81007259A US 2987858 A US2987858 A US 2987858A
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United States
Prior art keywords
bag
tape
heat
over
lip
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Expired - Lifetime
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US810072A
Inventor
William C Kerker
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Union Bag and Paper Corp
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Union Bag and Paper Corp
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Priority to US810072A priority Critical patent/US2987858A/en
Priority to FR40384A priority patent/FR1255292A/en
Priority to BE590151A priority patent/BE590151A/en
Application granted granted Critical
Publication of US2987858A publication Critical patent/US2987858A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D33/00—Details of, or accessories for, sacks or bags
    • B65D33/16—End- or aperture-closing arrangements or devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B1/00—Packaging fluent solid material, e.g. powders, granular or loose fibrous material, loose masses of small articles, in individual containers or receptacles, e.g. bags, sacks, boxes, cartons, cans, or jars
    • B65B1/20—Reducing volume of filled material
    • B65B1/24—Reducing volume of filled material by mechanical compression
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B51/00—Devices for, or methods of, sealing or securing package folds or closures; Devices for gathering or twisting wrappers, or necks of bags
    • B65B51/04—Applying separate sealing or securing members, e.g. clips
    • B65B51/06—Applying adhesive tape
    • B65B51/065—Applying adhesive tape to the necks of bags
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B7/00—Closing containers or receptacles after filling
    • B65B7/02—Closing containers or receptacles deformed by, or taking-up shape, of, contents, e.g. bags, sacks
    • B65B7/06—Closing containers or receptacles deformed by, or taking-up shape, of, contents, e.g. bags, sacks by collapsing mouth portion, e.g. to form a single flap
    • B65B7/08—Closing containers or receptacles deformed by, or taking-up shape, of, contents, e.g. bags, sacks by collapsing mouth portion, e.g. to form a single flap and folding

Definitions

  • the invention relates to improvements in methods of closing and sealing the ends of bag tubes. More particularly it pertains to the heat sealing and closing of multiwall paper bags to form a liquid and air-tight closure. This method is particularly well suited to close the bag disclosed in the pending application of Thomas M. Mc- Curry, Serial No. 810,079, filed April 30, 1959.
  • the invention accordingly comprises the several steps and the relation of one or more of such steps with respect to each of the others thereof, which will be exemplified in the method hereinafter disclosed, and the scope of the invention will be indicated in the claims.
  • FIGURE 1 is a schematic view showing successive steps in the method of the present invention.
  • FIGURE 2 is a sectional view taken along the line 22 of FIGURE 1;
  • FIGURE 3 is a sectional view taken along the line 33 of FIGURE 1;
  • FIGURE 4 is a sectional view taken along the line 44 of FIGURE 1;
  • FIGURE 5 is a sectional view taken along the line 55 of FIGURE 1;
  • FIGURE 6 is a sectional view similar to FIGURE 5 showing the lip of the bag folded against the face.
  • FIGURES 7 to 12, inclusive illustrate stages in the formation of the closure by means of the method of the present invention.
  • FIGURE 1 a multiwall paper bag 20 having a heat sealable inner ply.
  • the bag illustrated shows the top end stepped so that the outer ply or plies 20a of the long face of the bag extend beyond the inner ply 20b which in turn extends beyond the outer ply or plies 200 of the short face.
  • the advantages of such construction are fully set forth in the copending application referred to above.
  • FIGURE 7 pressure is applied to the faces over an area above the filled material. This can be done by pressure plates 21, as shown in FIGURES 1 and 2, which plates are adapted to be moved together or apart.
  • the application of pressure to the bag faces of the filled bag serves to squeeze a certain amount of air out of the bag and to bring the faces into superimposed position for the heat sealing step.
  • FIGURE 8 illustrates the bag after completion of this step.
  • a jaw 23b is moveable and cooperates with a jaw 23a for Patented June 13, 1961 the application of heat and pressure to the upper lip of the bag.
  • the jaw 23b contains a heating element 24 which supplies a line of heat to the bag through the bar 25a afiixed to the jaw.
  • the jaw 23a has a groove 25b which mates with the bar 25a during the heat sealing operation.
  • Below the heat sealing jaws and insulated therefrom is another pair of jaws 26a and 26b.
  • the jaw 26b is moveab-le and has a scoring bar 260 which mates with the groove 26d in the jaw 26a and scores the bag below the heat sealline.
  • the heat seal is made along a line 27 running across the top edge of the heat sealable inner ply while the score line 28 is made across the heat sealable inner ply just above the top edge of the short face of. the outer ply (FIGURE 9).
  • This score l-ine facilitates the folding of the lip as hereinafter described. It will be understood that the heat seal line and the score line can be positioned to suit the particular needs of the bag to which this method is being applied.
  • the bag Upon completion of the heat sealing of the inner ply the bag is passed over a blade which turns the extended lip over along the score line 28 so that it is substantially at right angles to the faces of the bag. While in such angular position the extended lip is fed between the tape roll 29 and the paste roll 30a.
  • the tape roll applies a strip of tape 31 to the extended lipof the bag. Such tape is cut off by the knives 32 and is of sufiicient length and width to project beyond the lip on,the three edges.
  • the pan 33 contains water which is fed by rolls 34a and 34b to the tape. If ungummed tape is employed the pan 33 is filled with paste similarly fed to the tape.
  • the paste roll 30 picks up paste from the roll 30b running through the paste in pan 35 and applies it in a band to the edge of the extended outer ply.
  • FIGURE 10 shows the bag at this stage.
  • the bag is now mode so that the extended lip is positioned under a folding plate 36, shown in FIGURES 1 and 5, which plate is actuated to fold over the extended lip along the score line 28 against the short face of the bag (FIGURE 6).
  • the paste on the extended edge of the outer ply will hold the extended lip in folded position whereas the pasted tape will reinforce the closure and cover the edge of the lip, t-hus insuring a neat and tight closure.
  • the pasted turned down lip will provide a sufiicient and effective closure without the use of the tape and this step may be omitted.
  • the ends of the tape are preferably turned over the side edges of the bag and secured to the opposite face, as shown in FIGURE 12. If the bottom of the bag has been closed in a similar manner, it will be apparent that both ends of the bag will have the same neat, attractive appearance (FIGURES 11 and 12).
  • a suitable horizontal conveyor may be employed to move the bag through the various stages illustrated in FIGURE 1.
  • this particular method has been described in conjunction with a particular type of bag, it will be evident that the method can also be used in providing a similar closure for other types of multiwall paper bags having a heat sealable inner ply.
  • the method of closing and sealing the open end of a filled multiwall bag having a stepped end with an exposed heat sealable inner ply of the type described which comprises the steps of applying pressure to the bag faces over an area above the filled material to evacuate air and align the faces, heat sealing the exposed inner ply to close the bag, folding over the end of the bag along a line below the heat seal band, adhesively securing a tape over the edge of the folded portion and securing such folded over portion and tape to the face of the bag.
  • the method of closing and sealing the open end of a filled multiwall bag having a stepped end with an exposed heat sealable inner ply of the type described which comprises the following steps while the bag is in an upright position: applying pressure to the bag faces over an area above the filled material to evacuate air and align the faces, heat sealing the exposed inner ply to close the bag, partially folding over the end of the bag along a line below the heat seal band to a plane angularly disposed to the faces of the bag, adhesively applying a tape along the outer side of the folded over portion while in such angularly disposed position with the tape extended over the lateral edge of such portion, applying adhesive to the inner side of such portion, completing the folding over and adhesively securing such portion and tape against the face of the bag.

Description

June 13, 1961 w..c. KERKER METHOD OF CLOSING BAG TUBE ENDS 2 Sheets-Sheet Filed April 50, 1959 INVENTOR. I V/LL/AM G. KER/(ER June 13, 1961 I w. c. KERKER 2,987,358
METHOD OF CLOSING BAG TUBE ENDS Filed April 50, 1959 2 Sheets-Sheet 2 United States Patent ginia Filed Apr. 30, 1959, Ser. No. 810,072 6 Claims. (Cl. 53-27) The invention relates to improvements in methods of closing and sealing the ends of bag tubes. More particularly it pertains to the heat sealing and closing of multiwall paper bags to form a liquid and air-tight closure. This method is particularly well suited to close the bag disclosed in the pending application of Thomas M. Mc- Curry, Serial No. 810,079, filed April 30, 1959.
It is an object of the present invention to provide a method which heat seals a multiwall bag, pastes the lip above the heat seal line, applies tape to such lip, and folds and secures such lip to the face of the bag, resulting in a tight, neat closure.
It is a further object of the invention to provide a method which will form the closure described at a fast rate, which can be performed in -a limited area of operating space, which is simple to carry out, and which operates in an effective manner.
Other objects of the invention will in part be obvious and will in part appear hereinafter.
The invention accordingly comprises the several steps and the relation of one or more of such steps with respect to each of the others thereof, which will be exemplified in the method hereinafter disclosed, and the scope of the invention will be indicated in the claims.
For a fuller understanding of the nature and objects of the invention, reference should be had to the following detailed description taken in connection with the accom panying drawing, in which:
FIGURE 1 is a schematic view showing successive steps in the method of the present invention;
FIGURE 2 is a sectional view taken along the line 22 of FIGURE 1;
FIGURE 3 is a sectional view taken along the line 33 of FIGURE 1;
FIGURE 4 is a sectional view taken along the line 44 of FIGURE 1;
FIGURE 5 is a sectional view taken along the line 55 of FIGURE 1;
FIGURE 6 is a sectional view similar to FIGURE 5 showing the lip of the bag folded against the face.
FIGURES 7 to 12, inclusive, illustrate stages in the formation of the closure by means of the method of the present invention.
Referring more particularly to the drawings there is shown in FIGURE 1 a multiwall paper bag 20 having a heat sealable inner ply. The bag illustrated shows the top end stepped so that the outer ply or plies 20a of the long face of the bag extend beyond the inner ply 20b which in turn extends beyond the outer ply or plies 200 of the short face. The advantages of such construction are fully set forth in the copending application referred to above.
After the bag has been filled, FIGURE 7, pressure is applied to the faces over an area above the filled material. This can be done by pressure plates 21, as shown in FIGURES 1 and 2, which plates are adapted to be moved together or apart. The application of pressure to the bag faces of the filled bag serves to squeeze a certain amount of air out of the bag and to bring the faces into superimposed position for the heat sealing step. FIGURE 8 illustrates the bag after completion of this step.
The bag is then passed between a pair of guide rails 22 to a heat sealing station shown in FIGURES 1 and 3. A jaw 23b is moveable and cooperates with a jaw 23a for Patented June 13, 1961 the application of heat and pressure to the upper lip of the bag. The jaw 23b contains a heating element 24 which supplies a line of heat to the bag through the bar 25a afiixed to the jaw. The jaw 23a has a groove 25b which mates with the bar 25a during the heat sealing operation. Below the heat sealing jaws and insulated therefrom is another pair of jaws 26a and 26b. The jaw 26b is moveab-le and has a scoring bar 260 which mates with the groove 26d in the jaw 26a and scores the bag below the heat sealline. In the particular bag shown, the heat seal is made along a line 27 running across the top edge of the heat sealable inner ply while the score line 28 is made across the heat sealable inner ply just above the top edge of the short face of. the outer ply (FIGURE 9). This score l-ine facilitates the folding of the lip as hereinafter described. It will be understood that the heat seal line and the score line can be positioned to suit the particular needs of the bag to which this method is being applied.
Upon completion of the heat sealing of the inner ply the bag is passed over a blade which turns the extended lip over along the score line 28 so that it is substantially at right angles to the faces of the bag. While in such angular position the extended lip is fed between the tape roll 29 and the paste roll 30a. The tape roll applies a strip of tape 31 to the extended lipof the bag. Such tape is cut off by the knives 32 and is of sufiicient length and width to project beyond the lip on,the three edges. If gummed tape is used the pan 33 contains water which is fed by rolls 34a and 34b to the tape. If ungummed tape is employed the pan 33 is filled with paste similarly fed to the tape. The paste roll 30:: picks up paste from the roll 30b running through the paste in pan 35 and applies it in a band to the edge of the extended outer ply. FIGURE 10 shows the bag at this stage.
The bag is now mode so that the extended lip is positioned under a folding plate 36, shown in FIGURES 1 and 5, which plate is actuated to fold over the extended lip along the score line 28 against the short face of the bag (FIGURE 6). The paste on the extended edge of the outer ply will hold the extended lip in folded position whereas the pasted tape will reinforce the closure and cover the edge of the lip, t-hus insuring a neat and tight closure. In some cases where there are few plies or they are of light weight, the pasted turned down lip will provide a sufiicient and effective closure without the use of the tape and this step may be omitted. The ends of the tape are preferably turned over the side edges of the bag and secured to the opposite face, as shown in FIGURE 12. If the bottom of the bag has been closed in a similar manner, it will be apparent that both ends of the bag will have the same neat, attractive appearance (FIGURES 11 and 12).
It should be further noted that the entire extended lip consisting of the outer ply and the heat sealed inner ply is folded over along the top edge of the short face and secured thereto. Consequently, any pressure from the contents of the bag will be exerted against the fold line rather than against the heat seal. This is partciularly important in the packaging of granular materials which have a tendency to work into the heat seal and eventually break such seal causing leakage.
In carrying out this method a suitable horizontal conveyor may be employed to move the bag through the various stages illustrated in FIGURE 1. Although this particular method has been described in conjunction with a particular type of bag, it will be evident that the method can also be used in providing a similar closure for other types of multiwall paper bags having a heat sealable inner ply.
Since certain changes may be made in carrying out the above method without departing from the scope of the invention, it is intended that all matter contained in the above description shall be interpreted as illustrative and not in a limiting sense.
It is also to be understood that the following claims are intended to cover all of the generic and specific features of the invention herein described, and all statements of the scope of the invention which, as a matter of language, might be said to fall therebetween.
Having described my invention, what I claim as new and desire to secure by Letters Patent is:
1. The method of closing and sealing the open end of a filled multiwall bag having a stepped end with an exposed heat sealable inner ply of the type described which comprises the steps of applying pressure to the bag faces over an area above the filled material to evacuate air and align the faces, heat sealing the exposed inner ply to close the bag, folding over the end of the bag along a line below the heat seal band, adhesively securing a tape over the edge of the folded portion and securing such folded over portion and tape to the face of the bag.
2. The method of closing and sealing the open end of a filled multiwall bag having a stepped end with an exposed heat sealable inner ply of the type described which comprises the steps of applying pressure to the bag faces over an area above the filled material to evacuate air and align the faces, heat sealing the exposed inner ply to close the bag, scoring the bag along a line below the heat seal band, adhesively securing a tape over the edge of the folded portion and securing such folded over portion andltape to the face of the bag.
3. The method of claim 2 in which the steps of heat sealing and scoring are performed simultaneously.
4. The method of claim 2 which includes the step of applying and adhesively securing a tape over the edge of the folded portion and the face of the bag.
5. The method of closing and sealing the open end of a filled multiwall bag having a stepped end with an exposed heat sealable inner ply of the type described which comprises the following steps while the bag is in an upright position: applying pressure to the bag faces over an area above the filled material to evacuate air and align the faces, heat sealing the exposed inner ply to close the bag, partially folding over the end of the bag along a line below the heat seal band to a plane angularly disposed to the faces of the bag, adhesively applying a tape along the outer side of the folded over portion while in such angularly disposed position with the tape extended over the lateral edge of such portion, applying adhesive to the inner side of such portion, completing the folding over and adhesively securing such portion and tape against the face of the bag.
6. The method of claim 2 in which the steps of scoring and folding are carried out together.
References Cited in the file of this patent UNITED STATES PATENTS 2,015,199 Sparks et al. Sept. 24, 1935 2,356,472 Rothaug Aug. 22, 1944 2,404,337 Williams et al. July 16, 1946 2,409,621 Geimer et al. Oct. 22, 1946 2,571,103 Belcher et al. Oct. 16, 1951 2,729,928 Willbrandt Jan. 10, 1956
US810072A 1959-04-30 1959-04-30 Method of closing bag tube ends Expired - Lifetime US2987858A (en)

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US810072A US2987858A (en) 1959-04-30 1959-04-30 Method of closing bag tube ends
FR40384A FR1255292A (en) 1959-04-30 1960-04-25 Method of closing the end of tubular bags
BE590151A BE590151A (en) 1959-04-30 1960-04-26 Method of closing the ends of tubular bags.

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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3124297A (en) * 1964-03-10 vergobbi
US3439470A (en) * 1964-02-04 1969-04-22 Windmoeller & Hoelscher Machine for closing bags
US4490960A (en) * 1980-07-25 1985-01-01 Doboy Packaging Machinery, Inc. Apparatus and method for closing reclosable bags
US4722166A (en) * 1980-03-13 1988-02-02 Dieckow Klaus Peter Packaging
US5493842A (en) * 1993-07-13 1996-02-27 Concetti S.P.A. Apparatus for the formation and application of a sealing flap to seal the mouth of a filled sack, starting from a continuous strip of heat-sealable material
US6347499B1 (en) * 1999-02-17 2002-02-19 Mcgregor James Bag sealing mechanism
US20100158418A1 (en) * 2008-12-22 2010-06-24 Jansen Mark E Heat activated adhesives for bag closures
US20100154362A1 (en) * 2008-12-22 2010-06-24 Jansen Mark E Method and Apparatus for Bag Closure and Sealing
US20100189380A1 (en) * 2008-12-22 2010-07-29 Gary Sargin Heat Activated Adhesives for Bag Closures
US20100192520A1 (en) * 2008-12-22 2010-08-05 Jansen Mark E Heat activated adhesives for bag closures
US20100293897A1 (en) * 2009-05-21 2010-11-25 Jansen Mark E Heat Activated Adhesives for Bag Closures
US20110019944A1 (en) * 2008-12-22 2011-01-27 Gary Sargin Method and system for folding and sealing bags

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2015199A (en) * 1933-06-05 1935-09-24 Lucien D Sparks Tobacco container
US2356472A (en) * 1941-02-04 1944-08-22 Rothaug Clarence Wells Container sealing machine
US2404337A (en) * 1944-04-13 1946-07-16 Bemis Bro Bag Co Bag closure means and method
US2409621A (en) * 1942-07-27 1946-10-22 Bemis Bro Bag Co Method of closing bag tube ends
US2571103A (en) * 1948-10-29 1951-10-16 Bemis Bro Bag Co Bag sealing machine
US2729928A (en) * 1953-01-15 1956-01-10 Battle Creek Packaging Machine Machine for folding and closing liner bags in cartons

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2015199A (en) * 1933-06-05 1935-09-24 Lucien D Sparks Tobacco container
US2356472A (en) * 1941-02-04 1944-08-22 Rothaug Clarence Wells Container sealing machine
US2409621A (en) * 1942-07-27 1946-10-22 Bemis Bro Bag Co Method of closing bag tube ends
US2404337A (en) * 1944-04-13 1946-07-16 Bemis Bro Bag Co Bag closure means and method
US2571103A (en) * 1948-10-29 1951-10-16 Bemis Bro Bag Co Bag sealing machine
US2729928A (en) * 1953-01-15 1956-01-10 Battle Creek Packaging Machine Machine for folding and closing liner bags in cartons

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3124297A (en) * 1964-03-10 vergobbi
US3439470A (en) * 1964-02-04 1969-04-22 Windmoeller & Hoelscher Machine for closing bags
US4722166A (en) * 1980-03-13 1988-02-02 Dieckow Klaus Peter Packaging
US4490960A (en) * 1980-07-25 1985-01-01 Doboy Packaging Machinery, Inc. Apparatus and method for closing reclosable bags
US5493842A (en) * 1993-07-13 1996-02-27 Concetti S.P.A. Apparatus for the formation and application of a sealing flap to seal the mouth of a filled sack, starting from a continuous strip of heat-sealable material
US6347499B1 (en) * 1999-02-17 2002-02-19 Mcgregor James Bag sealing mechanism
US20100189380A1 (en) * 2008-12-22 2010-07-29 Gary Sargin Heat Activated Adhesives for Bag Closures
US20100154362A1 (en) * 2008-12-22 2010-06-24 Jansen Mark E Method and Apparatus for Bag Closure and Sealing
US20100158418A1 (en) * 2008-12-22 2010-06-24 Jansen Mark E Heat activated adhesives for bag closures
US20100192520A1 (en) * 2008-12-22 2010-08-05 Jansen Mark E Heat activated adhesives for bag closures
US20110019944A1 (en) * 2008-12-22 2011-01-27 Gary Sargin Method and system for folding and sealing bags
US8241193B2 (en) 2008-12-22 2012-08-14 Coating Excellence International Llc Method and apparatus for bag closure and sealing
US8240915B2 (en) 2008-12-22 2012-08-14 Coating Excellence International Llc Heat activated adhesives for bag closures
US8297840B2 (en) 2008-12-22 2012-10-30 Coating Excellence International Llc Heat activated adhesives for bag closures
US8443578B2 (en) 2008-12-22 2013-05-21 Coating Excellence International Llc Apparatus for bag closure and sealing using heated air
US8475046B2 (en) 2008-12-22 2013-07-02 Coating Excellence International Llc Heat activated adhesives for bag closures
US9233502B2 (en) 2008-12-22 2016-01-12 Coating Excellence International Llc Method and apparatus for bag closure and sealing
US20100293897A1 (en) * 2009-05-21 2010-11-25 Jansen Mark E Heat Activated Adhesives for Bag Closures
WO2011016965A1 (en) * 2009-08-04 2011-02-10 Coating Excellence International Llc Method and apparatus for bag closure and sealing

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Publication number Publication date
BE590151A (en) 1960-08-16
FR1255292A (en) 1961-03-03

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