EP0215163A1 - Verfahren zum Vorbereiten von thermoplastischen Säcken mit flachem Boden und Systeme dafür - Google Patents

Verfahren zum Vorbereiten von thermoplastischen Säcken mit flachem Boden und Systeme dafür Download PDF

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Publication number
EP0215163A1
EP0215163A1 EP85305690A EP85305690A EP0215163A1 EP 0215163 A1 EP0215163 A1 EP 0215163A1 EP 85305690 A EP85305690 A EP 85305690A EP 85305690 A EP85305690 A EP 85305690A EP 0215163 A1 EP0215163 A1 EP 0215163A1
Authority
EP
European Patent Office
Prior art keywords
tube
forming
diagonal
gusset
seams
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.)
Granted
Application number
EP85305690A
Other languages
English (en)
French (fr)
Other versions
EP0215163B1 (de
Inventor
Gordon Leon Benoit
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.)
ExxonMobil Oil Corp
Original Assignee
Mobil Oil Corp
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
Priority to US06/746,924 priority Critical patent/US4571235A/en
Application filed by Mobil Oil Corp filed Critical Mobil Oil Corp
Priority to DE8585305690T priority patent/DE3576796D1/de
Priority to AT85305690T priority patent/ATE51360T1/de
Priority to EP85305690A priority patent/EP0215163B1/de
Publication of EP0215163A1 publication Critical patent/EP0215163A1/de
Application granted granted Critical
Publication of EP0215163B1 publication Critical patent/EP0215163B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING 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
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING 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
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B2155/00—Flexible containers made from webs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING 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
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B2155/00—Flexible containers made from webs
    • B31B2155/003—Flexible containers made from webs starting from tubular webs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING 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
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B2160/00—Shape of flexible containers
    • B31B2160/10—Shape of flexible containers rectangular and flat, i.e. without structural provision for thickness of contents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING 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
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B2160/00—Shape of flexible containers
    • B31B2160/20—Shape of flexible containers with structural provision for thickness of contents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING 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
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/26—Folding sheets, blanks or webs
    • B31B70/262—Folding sheets, blanks or webs involving longitudinally folding, i.e. along a line parallel to the direction of movement
    • B31B70/266—Folding sheets, blanks or webs involving longitudinally folding, i.e. along a line parallel to the direction of movement involving gusset-forming
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING 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
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/26—Folding sheets, blanks or webs
    • B31B70/36—Folding sheets, blanks or webs by continuously feeding them to stationary members, e.g. plates, ploughs or cores
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING 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
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/74—Auxiliary operations
    • B31B70/86—Forming integral handles or mounting separate handles
    • B31B70/874—Forming integral handles or mounting separate handles involving punching or cutting

Definitions

  • the present invention relates to methods and systems for preparing a thermoplastic sack, and, more particularly, to methods and systems for preparing such a sack having at least a substantially flat rectangular bottom.
  • One type of bag contemplated for preparation by a system and process of the present invention is more particularly defined in our copending European Patent Application No. 85303049.2.
  • the bag structure of that patent application is of a thermoplastic film material and it comprises front and rear bag walls connected by gusseted side walls.
  • the bag has an open mouth top portion, which is characterized by having handles located at opposite end regions thereof, said handles each being of two films as a result of being integral extensions of said front, rear and gusseted side walls.
  • the bag has a bottom wall planarly extensible so as to form a rectangle with at least no substantial excess film outside of the bulk volumetic capacity of the bottom region of said bag.
  • An alternative manner of describing the bottom of such a bag is that said bottom is formed from integral extensions of said front, rear and side walls and the closure thereof is 4 two-film gusset-to-­wall heat seals, when said bottom is a square, and 4 two-film gusset-­to-wall heat seals and 1 two-film front wall-to-back wall heat seals when said bottom is a rectangle.
  • the present invention also contemplates forming the same type of bag without handles.
  • the present invention is concerned with the method for preparing a handled, at least substantially flat, rectangular bottom, thermoplastic film sack comprising:
  • the present invention is also concerned with a method for preparing a handleless, at least substantially flat rectangular bottom, thermoplastic film sack comprising:
  • Another method according to the present invention involves continuously preparing a handleless, at least substantially flat, rectangular bottom, thermoplastic film sack comprising:
  • FIG. 1 there is illustrated a system and process sequence 50 for forming a handled, gusseted flat-bottomed thermoplastic sack.
  • a hollow cylinder or tube of thermoplastic film 12 is in the process of being collapsed by being passed through a combined gusset forming and gusset opening means 14.
  • This device can be of any construction which accomplishes the steps of collapsing the tube, forming oppositely disposed gussets therein and opening one fold of each gusset to the maximum so that they are spread open in a lay-flat position.
  • the gusset which normally is folded upon itself at an acute angle approaching 0°, is opened by flipping or turning one of the folds over so that the gusset lays flat at an angle approaching 180°.
  • this step can be accomplished simultaneously. If both gussets are small enough, they can be opened completely side-­by-side in a lay-flat position. As the gusset depth increases only one gusset fold can be opened at a time. As shown in Figure 1, and as suggested by the mid-fold line 16, both gussets were opened completely by the gusset forming and opening means 14.
  • gussets In a situation where the gussets are too large to be able to be opened side-by-side, they can be opened spatially sequentially. By this is meant, first one gusset will be opened as the tube progresses means 14 and at a point downstream in the system, after the first gusset returns to its closed position, the opposite gusset will be opened by an equivalent means to the lay-flat position.
  • device 14 can be a sheet-metal device which has an entrance side for receiving a flexible tube of cylindrical film. Sheet metal plates therein cause an infolding or gusset to be fashioned in the structure as the tube passes therethrough. The exit dimension progressively diminishes to present a fully collapsed gusseted tube. This device contains turning plates or rolls so that after the gusset is formed, the upper fold is progressively opened until it assumes a lay-flat, 180° position.
  • the gusset or gussets are opened so that a pair of diagonal sealed seams can be impressed in each of the four gusset folds as shown at 20.
  • the diagonal sealed seams extend over the portions of the tube width corresponding to the gussets along lines diagonal to the length of the tube. The seal-­pairs of each gusset in the lay-flat position form an angle of approximately 90° to one another.
  • a gusset closing device 22 flips or turns the open gusset and folds it back to the closed position so that the angle therebetween again approaches 0°. In this position the sealed seams 20 of each gusset are superimposed and in registration with one another.
  • Seal line 24 is a transverse sealing and severing seam which extends across and through the collapsed tube along a line which includes the inboard ends 28 of each pair of diagonal seams.
  • Transverse sealing and severing device 26 can be any suitable means which will bond and sever the collapsed tube along the defined line. This sealing and severing action will isolate sack blank 30 from the collapsed and gusseted tube. Sack blank 30 will have a seal 32 across the top thereof and the four triangular regions 34 will be bounded by seal lines 20, 24 and the side edge of the gusseted structure.
  • the sack blank structures 30 may be separately or collectively converted into bag structures by removal of the triangular regions 34 and by the formation of bag mouth opening 36 which simultaneously forms handle loops 38, each of which are formed of two layers of film by virtue of the gusseted structure. This will complete the formation of a handled sack, the bottom of which can be planarly extended so as to have a flat bottom.
  • planarly extended is meant that the bag is extended in internal volume to its utmost by expanding the gusssets fully, thereby forming a flat-­bottom, rectangular in nature, having a length larger than its width.
  • a linear low density polyethylene tubular film 12 is collapsed and simultaneously gusseted with the gussets then opened fully to approximately 180° as the tube passes through the gusset forming and opening means 14.
  • seals 20 and 24 are simultaneously formed. This action produces bottom seal 24 and top seal 30 at the same time.
  • This also isolates sack blank 30.
  • Sack blank 30 can then be removed to a station which can separately or simultaneously remove triangular sections 34, form bag mouth opening 36 and form handles 38. This can be accomplished on individual blanks or alternatively, blank 30 can be stacked in vertical registration and, through the means of a suitable cutting die mechanism, the triangular regions removed and the handle and bag mouth opening can be formed.
  • FIG. 2 For the formation of bags which do not contain a handle, the process and system is as shown in Figure 2.
  • the process and system 50a is different from that of Figure 1, beginning at the point where the bottom of the bag is sealed.
  • a bottom seal and perforating mechanism 40 is shown impressing seal-seam 42 in the flattened gusseted tube and, simultaneously therewith, perforation line 44 is formed closely adjacent and parallel to seal line 42.
  • Seal line 42 does not sever the tube, merely seals it.
  • Seal line 42 and perforation line 44 are impressed in the gusseted tube at the same time diagonal seals 20 are impressed into the opened gussets in the next succeeding gusseted tube structure.
  • each bag may be automatically separated at the perforation line and folded or stacked.
  • the sack resulting from the process and system of Figure 2 will have a rectangular bottom with a length larger than its width.
  • open mouth handleless structures can be formed by forming a severance transversely across the tube at the same time bottom seal 42 is formed. Thereafter, the corners of the sack blank corresponding to regions 46 can be severed to complete the bag structure.
  • the bag structure formed by the system and process illustrated in Figures 1 and 2 will yield a sack having a rectangular bottom when planarly extended, which bottom will have a length longer than its width.
  • the sack bottom will not be a square.
  • the process and means merely need be modified so that the gusset folds are both infolded to the maximum. That is, the collapsed tube will be gusseted to the longitudinal mid-line of the tube. In this case the center-fold of each gusset will contact the other and the angle between the thereafter formed diagonal seams will be at least about 90°.
  • the resulting sack will then have a substantially flat square bottom when planarly extended.
  • Bags of the structures described can be formed with a pair of registered tabs as integral extensions of the bag mouth opening as shown at 39 in Figure 1.
  • the bags can be stacked in registration to contain 50, 100, 150, etc, bags and the tabs 39 fastened together in some suitable manner.
  • the tabs can be ultrasonically welded together. A perforation line across the tab will form a convenient tear-off site for individual bags to be removed from the bag pack.
  • Bags of the structures described can be formed by employing any suitable thermoplastic material, for example, polyolefins.
  • polyolefins it is used generically to include all forms of the polymer species, including, for example, low density polyethylene, linear low density copolymers of ethylene and another olefin, high density polyethylene, mixtures and blends of the same, and other monomer counterparts, etc.
  • Thermoplastic coated paper stock is also contemplated.
  • the bag film can be of any gauge, for example, from about 0.3 to about 5 mils. in thickness.
  • the angle between the diagonal seal line and the bottom seal be at least approximately 135° when said bag is in its lay-flat condition. It is also preferred that the open mouth portion of the handled sacks of the present invention have stress relief curves or arcs extending from the base of the handle to a raised portion of the bag mouth. This will militate against splitting or tears occurring in the bag mouth during handle extension or when the bag is being filled with bulky material.
  • the handles and bag mouth opening can have any configuration.
  • the pertinent angles need not be precise. For example, they need not be exactly 90°, 45°, or 135°. Reasonable processing latitude should permit some deviation from these guidelines.
  • the ends thereof can be curved or angled in order to accommodate or insure good closure at all film interfaces and joints. Double or plural line seams and seals also can be employed.
EP85305690A 1984-05-02 1985-08-12 Verfahren zum Vorbereiten von thermoplastischen Säcken mit flachem Boden und Systeme dafür Expired - Lifetime EP0215163B1 (de)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US06/746,924 US4571235A (en) 1984-05-02 1985-06-19 Methods for preparing flat-bottom thermoplastic sack and systems therefore
DE8585305690T DE3576796D1 (de) 1985-08-12 1985-08-12 Verfahren zum vorbereiten von thermoplastischen saecken mit flachem boden und systeme dafuer.
AT85305690T ATE51360T1 (de) 1985-08-12 1985-08-12 Verfahren zum vorbereiten von thermoplastischen saecken mit flachem boden und systeme dafuer.
EP85305690A EP0215163B1 (de) 1985-08-12 1985-08-12 Verfahren zum Vorbereiten von thermoplastischen Säcken mit flachem Boden und Systeme dafür

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP85305690A EP0215163B1 (de) 1985-08-12 1985-08-12 Verfahren zum Vorbereiten von thermoplastischen Säcken mit flachem Boden und Systeme dafür

Publications (2)

Publication Number Publication Date
EP0215163A1 true EP0215163A1 (de) 1987-03-25
EP0215163B1 EP0215163B1 (de) 1990-03-28

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Family Applications (1)

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EP85305690A Expired - Lifetime EP0215163B1 (de) 1984-05-02 1985-08-12 Verfahren zum Vorbereiten von thermoplastischen Säcken mit flachem Boden und Systeme dafür

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EP (1) EP0215163B1 (de)
AT (1) ATE51360T1 (de)
DE (1) DE3576796D1 (de)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2320326A (en) * 1940-04-29 1943-05-25 Union Bag & Paper Corp Manufacture of heat sealed bags
GB1040439A (en) * 1963-09-12 1966-08-24 Canadian Ind Method and apparatus for making gusseted plastic bags
US3853664A (en) * 1973-08-01 1974-12-10 Square Bag It Corp Bag making machine and method
FR2242860A5 (en) * 1973-09-03 1975-03-28 Joice Richard Production of bases for thermoplastic bags - by welding double thickness film in double edge sections
DE2528709B1 (de) * 1975-06-27 1976-12-23 Lissner Gmbh Vorrichtung zum Herstellen von haubenfoermigen Gegenstaenden,insbesondere Bodenfaltenhauben
EP0021463A1 (de) * 1979-05-11 1981-01-07 Wavin B.V. Verfahren zur Herstellung einer Bahn aus mehreren miteinander verbundenen Kunststoffbeuteln
US4386924A (en) * 1980-10-23 1983-06-07 Fmc Corporation Handle bag making apparatus

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2320326A (en) * 1940-04-29 1943-05-25 Union Bag & Paper Corp Manufacture of heat sealed bags
GB1040439A (en) * 1963-09-12 1966-08-24 Canadian Ind Method and apparatus for making gusseted plastic bags
US3853664A (en) * 1973-08-01 1974-12-10 Square Bag It Corp Bag making machine and method
FR2242860A5 (en) * 1973-09-03 1975-03-28 Joice Richard Production of bases for thermoplastic bags - by welding double thickness film in double edge sections
DE2528709B1 (de) * 1975-06-27 1976-12-23 Lissner Gmbh Vorrichtung zum Herstellen von haubenfoermigen Gegenstaenden,insbesondere Bodenfaltenhauben
EP0021463A1 (de) * 1979-05-11 1981-01-07 Wavin B.V. Verfahren zur Herstellung einer Bahn aus mehreren miteinander verbundenen Kunststoffbeuteln
EP0064321A1 (de) * 1979-05-11 1982-11-10 Wavin B.V. Ein Band bestehend aus einer Mehrzahl von miteinander verbundenen Beuteln, ein von diesem Band erhaltener Beutel, ein Verfahren zum Herstellen dieses Bandes und ein Apparat zur Ausübung dieses Verfahrens
US4386924A (en) * 1980-10-23 1983-06-07 Fmc Corporation Handle bag making apparatus

Also Published As

Publication number Publication date
ATE51360T1 (de) 1990-04-15
EP0215163B1 (de) 1990-03-28
DE3576796D1 (de) 1990-05-03

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