US3094905A - Process for making bags - Google Patents

Process for making bags Download PDF

Info

Publication number
US3094905A
US3094905A US41701A US4170160A US3094905A US 3094905 A US3094905 A US 3094905A US 41701 A US41701 A US 41701A US 4170160 A US4170160 A US 4170160A US 3094905 A US3094905 A US 3094905A
Authority
US
United States
Prior art keywords
bag
adhesive
sealing
bags
sheet material
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US41701A
Inventor
Robert L Haslacher
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to US41701A priority Critical patent/US3094905A/en
Application granted granted Critical
Publication of US3094905A publication Critical patent/US3094905A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B31MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31BMAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00Making flexible containers, e.g. envelopes or bags
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B31MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31BMAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00Making flexible containers, e.g. envelopes or bags
    • B31B70/60Uniting opposed surfaces or edges; Taping
    • B31B70/62Uniting opposed surfaces or edges; Taping by adhesives
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B31MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31BMAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B2150/00Flexible containers made from sheets or blanks, e.g. from flattened tubes
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B31MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31BMAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B2150/00Flexible containers made from sheets or blanks, e.g. from flattened tubes
    • B31B2150/001Flexible containers made from sheets or blanks, e.g. from flattened tubes with square or cross bottom
    • B31B2150/0016Flexible containers made from sheets or blanks, e.g. from flattened tubes with square or cross bottom made from already formed bags
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B31MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31BMAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B2155/00Flexible containers made from webs
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B31MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31BMAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B2155/00Flexible containers made from webs
    • B31B2155/001Flexible containers made from webs by folding webs longitudinally
    • B31B2155/0012Flexible containers made from webs by folding webs longitudinally having their openings facing in the direction of movement
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B31MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31BMAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B2160/00Shape of flexible containers
    • B31B2160/10Shape of flexible containers rectangular and flat, i.e. without structural provision for thickness of contents
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B31MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31BMAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B2160/00Shape of flexible containers
    • B31B2160/20Shape of flexible containers with structural provision for thickness of contents
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S493/00Manufacturing container or tube from paper; or other manufacturing from a sheet or web
    • Y10S493/916Pliable container
    • Y10S493/936Square bottom

Definitions

  • This invention relates generally to improvements in the art of producing bags -of the gusseted type with certain modifications and refinements.
  • the invention is directed more particularly to the continuous production of completely formed, folded and properly sealed bags from a continuous source of sheet material normally supplied in roll configuration.
  • a primary object of this invention is to provide means for commercially producing an improved, superior gusseted bag utilizing an eicient method of inexpensively forming a rectangular or squared bottom in conjunction with the sealing of the transverse or 'bottom terminal ap.
  • the chief aim of the present invention is to enable the economical manufacture of large quantities of bags incorporating the best features of both -t-he automatic and gusseted type bags with special apparatus providing for the forming of a rectangular bottom substantially with the bag bottom or terminal flap sealing operation.
  • This procedure obviates the possibility of leakage at the flap upon completion of the forming and sealing operation, and also precludes the necessity for utilizing the usual staggered die-cutting and special folding and handling of the bottom portion.
  • FIG. l is a diagrammatic view illustrating generally the sequence of operations utilized -to produce a bag
  • IFIG. 2 is a side view of the bag ap sealing mechanism with the bottom shaping ram shown in the inoperative position;
  • FIG. 3 is similar to FIG. 2 but with the apparatus in the operative or extended position;
  • FIG. 4 is a top view of the expansible ram in closed position
  • FIG. 5 is an end view of the ram in open or bottom forming position
  • IFIG. 6 is a side view of a partially folded bag
  • FIGS. 7, 8 and 9 are sequential views of a bag yduring various stages of the bottom for-ming operation
  • FIG. 10 is an exaggerated cross-section of a sealed terminal flap
  • IFIG. 11 is a view of the adhesive applying bar
  • FIG. 12 is a partial view of the sheet material showing the placement of adhesive thereon.
  • FIG. 1 the major parts and mechanisms required to complete the forming, shaping and sealing operations are shown diagrammatically in FIG. 1 to illustrate the sequence of the manufacturing operation.
  • a web of flat sheet material 10 - is supplied from a rotatably supported roll 11, is guided around a tension control mechanism 12 and roller supports 13 to receive a continuous stripe of adhesive along one margin from applicator 14 to provide for the longitudinal seam -to be completed later.
  • a second applicator device 15 provides a special transverse band of adhesive at the proper predetermined longitudinal intervals for the subsequent terminal flap sealing operation. Scoring of the sheet for later folding may also be accomplished at this point utilizing the usual methods.
  • the sheet material is next formed into a generally open tubular configuration with reentrant flaps folded inwardly by a tube forming unit 16, passing around the support- -ing leg of the reciprocating ram framework 17 to the longitudinal seaming unit 18.
  • the completed tube then moves over the expansible forming mechanism 19 at the extremity of ram framework 17 to the transverse or terminal flap sealing unit 21-where the bottom is shaped to the desired rectangular or squared conformation while the terminal flap is being sealed.
  • FIGS. 2 and 3 The functions of the reciprocating drive mechanism and the expansible ram for shaping the bag bottom against the transverse sealing xture are best shown in FIGS. 2 and 3.
  • the web of sheet material 10 is fed around the upright supporting leg 22 of the reciprocating ram framework 17 in the form of an uncompleted tube open at its top.
  • a fluid operated cylinder 23 is mounted on leg 22 and functions through bell crank lever 24 against the pull of spring 25 to move the sliding ram element 26 horizontally in the grooved guide members 27 of the ram framework 17.
  • Spring 25 may be omitted if the drive cylinder 23 is of the double-acting type or positively driven in both directions.
  • lever arms 29 and 31 Pivotally connected to the projecting end 28 of reciproeating element 26 are two sets of connecting lever arms 29 and 31. (Also see FIGS. 4 and 5.) The opposite ends of levers 29 and 31 are hingedly pinned by means of integral upstanding lugs 32 to bottom shaping plates 33 and 34. 'I'hese plates are also pivotally supported at their inner ends on extensions 35 of grooved guide members 27 by means of shaft 36.
  • longitudinal movement of slider element 26 with reference to guide members 27 will cause plates 33 and 34 to rotate outwardly about the shaft 36 until mating edges 37 engage each other so that the plates form a continuous unbroken at surface.
  • Opposite edges 38 of plates 33 and 34 are preferably slightly bent radially to prevent tearing of the material during the bottom shaping operation.
  • the transverse terminal flap sealing unit 21 comprises a pair of spaced, cooperating rotatable elements 41 and 42 each of which 4is made up of supporting arms 43 pivotally mounted as at 44.
  • Generally ilat plates 4S are attached to the forward ends of arms 43 to which are also attached the transverse sealing bars 46. Plates 45 and sealing bars 46 serve together to form a smooth surface against which the bag material is pressed during the shaping procedure.
  • Sealing bars 46 may be of the electrically heated type if desired for the simultaneous application of heat and pressure for the sealing of thermoplastic sheet material or the like.
  • sealing bars 46 may be provided with relieved portions 1n the working face to accommodate the increased thickness of the material lat the seam and gussets,
  • a cutoi knife 47 and cooperating shearing jaw 48 may be attached to elements 41 and 42 to provide for severing the continuous tube simultaneously with the sealing operation.
  • a generally claw-shaped assembly 51 comprising an arcuate plate 52 and supporting arms 53 is pivotally supported at fulcrum points 54 and is adapted to be rotatably operated (by means not shown) in a counterclockwise direction immediately after retraction of the bottom shaping plates to their closed position.
  • Edge 55 of plate 52 is adapted to contact the top side of the squared bag to induce folding of the material along the previously applied score line 56 so the bag will attain the configuration shown in FIG. 6.
  • the terminal flap may be folded over by any known mechanism and adhesively secured if deemed essential.
  • pivoted tucking fingers 61 may be provided for initiating the infolding of the triangularly shaped portions 62 of the guests during the collapsing or flattening of the squared bag bottom, score lines 63 having previously been applied in the proper location.
  • Fingers 61 are rotatably mounted on rod supports 64 and are operated simultaneously with the actuation of bottom shaping assembly.
  • Springs 65 are provided to bias the ngers against actuating rods 64 but permit the fingers to move out of the way as the bag progresses past the shaping assembly and between the two parts of the terminal ap sealing mechanism to the finished bag stacking trays (not shown).
  • FIGS. 7, 8 and 9 The sequence of the squared bottom bag shaping and folding operation is best illustrated in FIGS. 7, 8 and 9; wherein FIG. 7 shows the generally tubular end portion 66 as it appears after the transverse bottom sealing operation of terminal ap ,67 has been completed, the longitudinal overlap seal 68 having been previously accomplished by unit 18. Sealing bars are omitted for clarity.
  • FIG. 8 shows the end portion 66 after the squaring operation has been completed by actuation of the reciprocating ram, and consequent pressure of the shaping plates against the iap sealing unit.
  • the folding score line is indicated at 56 and the triangularly shaped infold portion is located at 62 with score lines 63.
  • FIG. 9 the end has been severed and the resulting bag is illustrated in the completely atened position ready for stacking and packing.
  • FIG. l is an exaggerted transverse cross section ⁇ through the terminal flap 67 at the bottom of a bag which has been sealed in accordance with one embodiment of this invention.
  • adhesive is applied in suiicient volume on speciiic areas of the sheet material prior to the flap sealing in a manner to be explained.
  • An adhesive applying bar 76 shown in FIG. 1-1, is
  • Bar 76 is fabricated with the required number of slots or indentations 77 to provide for transfer of additional adhesive at predetermined spots.
  • the slots 77 are appropriately spaced in accordance with the dimensions of the bag being fabricated. It will be readily apparent that by having an increased amount of adhesive applied to the sheet material at speciic areas of the transverse band 78, this surplus can be utilized to advantage to prevent voids from occurring in the completed terminal ap seal.
  • Slot 77a is properly located to take care of the over-lap at 73 While a pair of slots 77b cooperates to supply additional adhesive to accommodate the usual void at the inner end 71 of one re-entrant ilap and similarly pair 77c the opposite ap.
  • the placement of these heavier quantities of adhesive on the sheet material prior to the folding operation can best be Seen in FIG. l2, wherein the darker shaded areas indicate the surplus applied for obviating the voids which result from the usual manufacture of terminal flap seals.
  • the adhesive is of heat sealing nature in order that a siftproof bag be produced.

Landscapes

  • Making Paper Articles (AREA)

Description

June 25, 1963 A. B. HASLACHER 3,094,905
PROCESS FOR MAKING BAGS Filed July 8, 1960 2 Sheets-Sheet 1 BY M "Y A 7mm/16 June 25, 1963 A. B. HAsLAcl-IER 3,094,905
PROCESS FOR MAKING BAGS Filed July 8, 19,60 2 Sheets-Sheet 2 61 o @t 65A Il F65 il," 6l 5 1 I 54- 53 l 54 35 af 27 v 29 (31 f I j 27 9 32 z? E [Il z5 .I E' 3l 36 I 6 2e d 32' ,@IV 3a l 27 Z9 Z235 m37 IN V EN TOR.'
A TTRNKS United States Patent Office Patented June 25, 1963 3,094,905 PROCESS FOR MAKING BAGS Alfred B. Haslacher, deceased, late of San Francisco, Calif., by Robert L. Haslacher, administrator, 817 Greenwich Place, Palo Alto, Calif.
Filed July 8, 1960, Ser. No. 41,701 1 Claim. (Cl. 93--35) This invention relates generally to improvements in the art of producing bags -of the gusseted type with certain modifications and refinements. The invention is directed more particularly to the continuous production of completely formed, folded and properly sealed bags from a continuous source of sheet material normally supplied in roll configuration.
A primary object of this invention is to provide means for commercially producing an improved, superior gusseted bag utilizing an eicient method of inexpensively forming a rectangular or squared bottom in conjunction with the sealing of the transverse or 'bottom terminal ap.
It is well known in the packaging industry to fabricate bags of the type commonly called automatic or squarebottomed in which the bag-opening motion will result i-n the bottom -portion assuming a transverse position so the bag will stand in an upright position to Afacilitate lling. However, this type of bag has previously been expensive to manufacture because of the various slitting, trimming and pasting operations which must be performed on the bottom.
The ordinary type of side gusseted bag is cheaper to produce but is considered less acceptable for commercial use since it is more difficult to open and does not provide other desirable handling advantages of the above-mentioned automatic bags. In addition, this type of bag normally is not properly sealed against seepage therethrough of liquids or fine-grained materials.
The chief aim of the present invention is to enable the economical manufacture of large quantities of bags incorporating the best features of both -t-he automatic and gusseted type bags with special apparatus providing for the forming of a rectangular bottom substantially with the bag bottom or terminal flap sealing operation.
More particularly, it is the primary object of this invention to facilitate the manufacture of reliable bags by utilizing a mechanism including a reciprocating expansible ram during the manufacturing process to transform the ordinary gusseted bag into one having the generally dcsirable handling characteristics and features of that type known in the art as an automatic bag.
It is a further object of the present invention to enable the expeditious production of goperly sealed bags by the addition of extra adhesive material in a particular manner to completely fill the voids at the terminal ap occasioned by the material folding and over-lapping process. This procedure obviates the possibility of leakage at the flap upon completion of the forming and sealing operation, and also precludes the necessity for utilizing the usual staggered die-cutting and special folding and handling of the bottom portion.
Other objects and advantages of the invention will become apparent from the following detailed description of the attached drawing wherein:
FIG. l is a diagrammatic view illustrating generally the sequence of operations utilized -to produce a bag;
IFIG. 2 is a side view of the bag ap sealing mechanism with the bottom shaping ram shown in the inoperative position;
FIG. 3 is similar to FIG. 2 but with the apparatus in the operative or extended position;
FIG. 4 is a top view of the expansible ram in closed position;
FIG. 5 is an end view of the ram in open or bottom forming position;
IFIG. 6 is a side view of a partially folded bag;
FIGS. 7, 8 and 9 are sequential views of a bag yduring various stages of the bottom for-ming operation;
FIG. 10 is an exaggerated cross-section of a sealed terminal flap;
IFIG. 11 is a view of the adhesive applying bar;
FIG. 12 is a partial view of the sheet material showing the placement of adhesive thereon.
Referring now to the drawings, the major parts and mechanisms required to complete the forming, shaping and sealing operations are shown diagrammatically in FIG. 1 to illustrate the sequence of the manufacturing operation. A web of flat sheet material 10 -is supplied from a rotatably supported roll 11, is guided around a tension control mechanism 12 and roller supports 13 to receive a continuous stripe of adhesive along one margin from applicator 14 to provide for the longitudinal seam -to be completed later. A second applicator device 15 provides a special transverse band of adhesive at the proper predetermined longitudinal intervals for the subsequent terminal flap sealing operation. Scoring of the sheet for later folding may also be accomplished at this point utilizing the usual methods.
The sheet material is next formed into a generally open tubular configuration with reentrant flaps folded inwardly by a tube forming unit 16, passing around the support- -ing leg of the reciprocating ram framework 17 to the longitudinal seaming unit 18. The completed tube then moves over the expansible forming mechanism 19 at the extremity of ram framework 17 to the transverse or terminal flap sealing unit 21-where the bottom is shaped to the desired rectangular or squared conformation while the terminal flap is being sealed.
The functions of the reciprocating drive mechanism and the expansible ram for shaping the bag bottom against the transverse sealing xture are best shown in FIGS. 2 and 3. As previously stated, the web of sheet material 10 is fed around the upright supporting leg 22 of the reciprocating ram framework 17 in the form of an uncompleted tube open at its top. A fluid operated cylinder 23 is mounted on leg 22 and functions through bell crank lever 24 against the pull of spring 25 to move the sliding ram element 26 horizontally in the grooved guide members 27 of the ram framework 17. Spring 25 may be omitted if the drive cylinder 23 is of the double-acting type or positively driven in both directions.
Pivotally connected to the projecting end 28 of reciproeating element 26 are two sets of connecting lever arms 29 and 31. (Also see FIGS. 4 and 5.) The opposite ends of levers 29 and 31 are hingedly pinned by means of integral upstanding lugs 32 to bottom shaping plates 33 and 34. 'I'hese plates are also pivotally supported at their inner ends on extensions 35 of grooved guide members 27 by means of shaft 36. Thus, longitudinal movement of slider element 26 with reference to guide members 27 will cause plates 33 and 34 to rotate outwardly about the shaft 36 until mating edges 37 engage each other so that the plates form a continuous unbroken at surface. Opposite edges 38 of plates 33 and 34 are preferably slightly bent radially to prevent tearing of the material during the bottom shaping operation.
The transverse terminal flap sealing unit 21 comprises a pair of spaced, cooperating rotatable elements 41 and 42 each of which 4is made up of supporting arms 43 pivotally mounted as at 44. Generally ilat plates 4S are attached to the forward ends of arms 43 to which are also attached the transverse sealing bars 46. Plates 45 and sealing bars 46 serve together to form a smooth surface against which the bag material is pressed during the shaping procedure. Sealing bars 46 may be of the electrically heated type if desired for the simultaneous application of heat and pressure for the sealing of thermoplastic sheet material or the like. Either one or both of the sealing bars 46 may be provided with relieved portions 1n the working face to accommodate the increased thickness of the material lat the seam and gussets, A cutoi knife 47 and cooperating shearing jaw 48 may be attached to elements 41 and 42 to provide for severing the continuous tube simultaneously with the sealing operation.
A generally claw-shaped assembly 51, comprising an arcuate plate 52 and supporting arms 53 is pivotally supported at fulcrum points 54 and is adapted to be rotatably operated (by means not shown) in a counterclockwise direction immediately after retraction of the bottom shaping plates to their closed position. Edge 55 of plate 52 is adapted to contact the top side of the squared bag to induce folding of the material along the previously applied score line 56 so the bag will attain the configuration shown in FIG. 6. The terminal flap may be folded over by any known mechanism and adhesively secured if deemed essential.
If it is found to be necessary for expeditious operations, pivoted tucking fingers 61 may be provided for initiating the infolding of the triangularly shaped portions 62 of the guests during the collapsing or flattening of the squared bag bottom, score lines 63 having previously been applied in the proper location. Fingers 61 are rotatably mounted on rod supports 64 and are operated simultaneously with the actuation of bottom shaping assembly. Springs 65 are provided to bias the ngers against actuating rods 64 but permit the fingers to move out of the way as the bag progresses past the shaping assembly and between the two parts of the terminal ap sealing mechanism to the finished bag stacking trays (not shown).
The sequence of the squared bottom bag shaping and folding operation is best illustrated in FIGS. 7, 8 and 9; wherein FIG. 7 shows the generally tubular end portion 66 as it appears after the transverse bottom sealing operation of terminal ap ,67 has been completed, the longitudinal overlap seal 68 having been previously accomplished by unit 18. Sealing bars are omitted for clarity. FIG. 8 shows the end portion 66 after the squaring operation has been completed by actuation of the reciprocating ram, and consequent pressure of the shaping plates against the iap sealing unit. The folding score line is indicated at 56 and the triangularly shaped infold portion is located at 62 with score lines 63. In FIG. 9 the end has been severed and the resulting bag is illustrated in the completely atened position ready for stacking and packing.
FIG. l is an exaggerted transverse cross section` through the terminal flap 67 at the bottom of a bag which has been sealed in accordance with one embodiment of this invention. At the extremities 71 of the inner folds of the reentrant iiaps 72 and at the inner end 73 of overlap 68 there normally exist areas which are devoid of sealant by virtue of the ifset of the sheet material at these points. In order to satisfactorily fill and seal these voids, adhesive is applied in suiicient volume on speciiic areas of the sheet material prior to the flap sealing in a manner to be explained.
An adhesive applying bar 76, shown in FIG. 1-1, is
.4 a part of the applicator device 15 previously mentioned. Bar 76 is fabricated with the required number of slots or indentations 77 to provide for transfer of additional adhesive at predetermined spots. The slots 77 are appropriately spaced in accordance with the dimensions of the bag being fabricated. It will be readily apparent that by having an increased amount of adhesive applied to the sheet material at speciic areas of the transverse band 78, this surplus can be utilized to advantage to prevent voids from occurring in the completed terminal ap seal. Slot 77a is properly located to take care of the over-lap at 73 While a pair of slots 77b cooperates to supply additional adhesive to accommodate the usual void at the inner end 71 of one re-entrant ilap and similarly pair 77c the opposite ap.
The placement of these heavier quantities of adhesive on the sheet material prior to the folding operation can best be Seen in FIG. l2, wherein the darker shaded areas indicate the surplus applied for obviating the voids which result from the usual manufacture of terminal flap seals. Preferably, the adhesive is of heat sealing nature in order that a siftproof bag be produced.
What I claim is:
'I'he process of producing bags from sheet material comprising:
(a) continuously advancing a continuous web of sheet material;
(b) applying a continuous adhesive stripe to one 1ongituslinal margin of the continuously advancing materi (c) applying transverse bands of adhesive at right angles to said stripe of adhesive material said bands .being applied at predetermined spaced intervals along the length of the material and said band of adhesive being applied in varying amounts across the width of the material with the greatest amount of adhesive being applied at points corresponding to offsets on the finished bags;
(d) thereafter folding the sheet material to form a generally flattened tube having inwardly disposed gussets, the outer edges of the material being overlapped and united along the line of the adhesive stripe;
(e) pressing an end of the generally flattened tube together to form a transverse, face-to-face seal;
(f) expanding the thus sealed end of the bag to form la rectangular bottom by exerting force from inside the -bag against the bottom of the bag;
(g) folding said bottom against |a sidewall of said bag; and
(h) severing the material to form the completed bag detached from the web of material.
References Cited in the file of this patent UNITED STATES PATENTS Appel Aug. 28, 1888 v
US41701A 1960-07-08 1960-07-08 Process for making bags Expired - Lifetime US3094905A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US41701A US3094905A (en) 1960-07-08 1960-07-08 Process for making bags

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US41701A US3094905A (en) 1960-07-08 1960-07-08 Process for making bags

Publications (1)

Publication Number Publication Date
US3094905A true US3094905A (en) 1963-06-25

Family

ID=21917879

Family Applications (1)

Application Number Title Priority Date Filing Date
US41701A Expired - Lifetime US3094905A (en) 1960-07-08 1960-07-08 Process for making bags

Country Status (1)

Country Link
US (1) US3094905A (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3774509A (en) * 1971-09-01 1973-11-27 Sig Schweiz Industrieges Device for making bags
US3886850A (en) * 1973-05-23 1975-06-03 Midland Ross Corp Method of forming flat bottoms on bags of creasable material
US3896709A (en) * 1972-11-14 1975-07-29 Windmoeller & Hoelscher Process and apparatus for manufacturing block bottom bags from heat-sealable material
US3896714A (en) * 1972-11-20 1975-07-29 Windmoeller & Hoelscher Process of manufacturing block bottom bags
US3916770A (en) * 1973-07-03 1975-11-04 Violet M Hanson Method of making a flat bottom bag
US3924521A (en) * 1974-05-22 1975-12-09 Violet M Hanson Method for forming flat bottom plastic bags
US3988970A (en) * 1974-05-22 1976-11-02 Violet M. Hanson Apparatus for forming flat bottom plastic bags
FR2420423A1 (en) * 1978-03-24 1979-10-19 Union Carbide Corp PROCESS FOR PRODUCING A PLASTIC BAG WITH A FLAT BOTTOM
US4230030A (en) * 1978-08-11 1980-10-28 Violet M. Hanson Machine and method for manufacturing square or flat bottom bags having movable positions or stations including the use of a mandrel
WO2023280528A1 (en) * 2021-07-06 2023-01-12 Rovema Gmbh Block-bottom bag, tubular bag machine, and method for producing a block-bottom bag

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US388612A (en) * 1888-08-28 Art of making paper bags
US2125306A (en) * 1933-05-05 1938-08-02 Smithe Machine Co Inc F L Manufacture of satchel bottom bags
US2244282A (en) * 1938-12-19 1941-06-03 Bergstein Robert Morris Art of making liquid-tight containers
US2256506A (en) * 1940-03-19 1941-09-23 Thomas M Royal & Company Method and apparatus for making bags
US2297946A (en) * 1939-10-23 1942-10-06 Henry H Doering Carton liner for molded edibles and method of folding
US2353746A (en) * 1940-07-13 1944-07-18 Shellmar Products Co Packaging process

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US388612A (en) * 1888-08-28 Art of making paper bags
US2125306A (en) * 1933-05-05 1938-08-02 Smithe Machine Co Inc F L Manufacture of satchel bottom bags
US2244282A (en) * 1938-12-19 1941-06-03 Bergstein Robert Morris Art of making liquid-tight containers
US2297946A (en) * 1939-10-23 1942-10-06 Henry H Doering Carton liner for molded edibles and method of folding
US2256506A (en) * 1940-03-19 1941-09-23 Thomas M Royal & Company Method and apparatus for making bags
US2353746A (en) * 1940-07-13 1944-07-18 Shellmar Products Co Packaging process

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3774509A (en) * 1971-09-01 1973-11-27 Sig Schweiz Industrieges Device for making bags
US3896709A (en) * 1972-11-14 1975-07-29 Windmoeller & Hoelscher Process and apparatus for manufacturing block bottom bags from heat-sealable material
US3896714A (en) * 1972-11-20 1975-07-29 Windmoeller & Hoelscher Process of manufacturing block bottom bags
US3886850A (en) * 1973-05-23 1975-06-03 Midland Ross Corp Method of forming flat bottoms on bags of creasable material
US3916770A (en) * 1973-07-03 1975-11-04 Violet M Hanson Method of making a flat bottom bag
US3924521A (en) * 1974-05-22 1975-12-09 Violet M Hanson Method for forming flat bottom plastic bags
US3988970A (en) * 1974-05-22 1976-11-02 Violet M. Hanson Apparatus for forming flat bottom plastic bags
FR2420423A1 (en) * 1978-03-24 1979-10-19 Union Carbide Corp PROCESS FOR PRODUCING A PLASTIC BAG WITH A FLAT BOTTOM
US4230030A (en) * 1978-08-11 1980-10-28 Violet M. Hanson Machine and method for manufacturing square or flat bottom bags having movable positions or stations including the use of a mandrel
WO2023280528A1 (en) * 2021-07-06 2023-01-12 Rovema Gmbh Block-bottom bag, tubular bag machine, and method for producing a block-bottom bag

Similar Documents

Publication Publication Date Title
US2196666A (en) Method and means of making containers
US3257915A (en) Bag forming machine
US3027695A (en) Method and apparatus for packaging
US3988970A (en) Apparatus for forming flat bottom plastic bags
US3543467A (en) Method and apparatus for packaging with a movable mandrel
US4532754A (en) Tube former apparatus
US3094905A (en) Process for making bags
US2648263A (en) Method of making bags
US3314210A (en) Process and a device for manufacturing packages
US3548563A (en) Method and apparatus for packaging with a movable mandrel and platen top sealing jaws
US2606412A (en) Method of making sealed packages
US3353327A (en) Gusset apparatus for bag form and fill machine and method
US4169344A (en) Apparatus for fabricating cushioning and insulating material
US3552278A (en) Method and apparatus for making interconnected bags having closure flaps and bottom gussets
US3973474A (en) Apparatus for making bags
US3924521A (en) Method for forming flat bottom plastic bags
US3552081A (en) Method and apparatus for packaging with a movable mandrel and movable sealing jaws
US2229864A (en) Method and means for making containers
US3646856A (en) Method of making a valve bag
US2277289A (en) Rotatable packaging machine and method
US2741956A (en) Machines for making bags, envelopes or similar containers
US4562691A (en) Vertical packaging machine for bags with erectable self-supporting tensile structure with flat bottom
US3605570A (en) Method of making a plastic bag with handle
US3464181A (en) Apparatus for making and filling rectangular containers
US3348458A (en) Pleater for sheet material and means for tying and cutting casings