US3590698A - Method for manufacturing a plastic block bag - Google Patents

Method for manufacturing a plastic block bag Download PDF

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Publication number
US3590698A
US3590698A US866427A US3590698DA US3590698A US 3590698 A US3590698 A US 3590698A US 866427 A US866427 A US 866427A US 3590698D A US3590698D A US 3590698DA US 3590698 A US3590698 A US 3590698A
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US
United States
Prior art keywords
flap
tubular foil
incision
longitudinal
folding
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
US866427A
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English (en)
Inventor
Vries J R J H De
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.)
Industriele Onderneming Wavin NV
Wavin BV
Original Assignee
Wavin BV
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 claimed from NL6814532A external-priority patent/NL6814532A/xx
Priority claimed from NL6905187A external-priority patent/NL6905187A/xx
Application filed by Wavin BV filed Critical Wavin BV
Application granted granted Critical
Publication of US3590698A publication Critical patent/US3590698A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • B65D31/00—Bags or like containers made of paper and having structural provision for thickness of contents
    • B65D31/14—Valve bags, i.e. with valves for filling
    • 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
    • B65D31/00—Bags or like containers made of paper and having structural provision for thickness of contents
    • B65D31/08—Bags or like containers made of paper and having structural provision for thickness of contents with block bottoms
    • 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
    • B65D31/00—Bags or like containers made of paper and having structural provision for thickness of contents
    • B65D31/14—Valve bags, i.e. with valves for filling
    • B65D31/142—Valve bags, i.e. with valves for filling the filling port being formed by folding a flap connected to a side, e.g. block bottoms

Definitions

  • the bottom flaps are inwards folded about a cross folding line situated between the folding line and the line extending perpendicularly to the longitudinal edges of the tubular foil.
  • the foils are sealed together by applying heat to both sides of the stack of foils to be connected.
  • the seals are discontinuous a layer impermeable for solid substances and letting a gas through is. provided.
  • a V formed part may be removed from the part forming the valve flap.
  • the part forming the valve flap may be subjected to stretching and/or provided with superfcial incision resulting into a better flexibility of the treated part.
  • the invention relates to a method for manufacturing a plastic bag, whether or not provided with a filling valve, from a tubular foil by making from one end of the tubular foil at least one incision whilst formirig a first corner flap between the longitudinal incision and the longitudinal edge of the tubular foil which is nearest thereto, whereupon the bottom flap portion situated on the other side beside the longitudinal incision are folded outwards about a folding line extending in the tubular foil portion next to the point of incision, and folding inwards the bottom flaps about a transverse folding line situated between the folding line and the line extending perpendicularly to the longitudinal edges of the tubular foil and through the end point of the longitudinal incision and making connec tions in order to connect the bottom flap portions.
  • the starting point is a tubular foil wherein the end edges of the bottom flap portions situated beside the incision extend, at least from the incision, partially aslant with respect to the longitudinal edges of the tubular foil, and the bottom flap portions are inwards folded about a crossfolding line situated between the folding line and the line extending perpendicularly to the longitudinal edges of the tubular foil through the end point of the longitudinal incision whilst folding back triangular portions of the second corner flap, situated beside the crossfolding line, under the remaining portion of the comer flap, preferably the seals are obtained by applying heat to both sides of the seals of the bottom to be formed.
  • FIG. I is a flattened part of a tubular foil used for manufacturing a bag
  • FIG. 2 is a tubular foil according to FIG. ll after folding the comer flaps;
  • FIG. 3 shows a sealed bottom of a bag obtained from a tubular foil portion according to FIG. i;
  • FIG. 4 shows a modified embodiment of the sealed bottom of the bag according to FIG. 1;
  • FIG. 5 shows a flattened part of a tubular foil provided with two longitudinal incisions
  • FIG. 6 shows a part of a tubular foil according to FIG. 5 in the unfolded position
  • FIG. 7 shows a bottom of a bag obtained after making seals in the bottom of the back formed from the tubular foil according to FIGS. 5 and 6;
  • FIG. 8 shows the way in which a tubular foil according to FIG. 5 is cut from a very long tubular foil
  • FIG. 9 shows a flattened tubular foil portion with two longitudinal incisions and two comer flaps of dissimilar length, the end edges of the bottom flaps extending aslant with respect to the longitudinal edges of the tubular foil;
  • FIG. 10 shows a part of the tubular foil according to FIG. 9 in an unfolded situation
  • FIG. 11 shows a sealed bottom of a bag of a tubular foil portion according to FIG. 9 obtained after folding the bottom flaps and providing the sealed connections,
  • FIG. 12a and 12b sections of the bottom of a plastic bag and a stretched or superficially incised valve, before and after filling the bag;
  • FIG. 33 a device for stretching a valve
  • FIG. M a sealing and separating device as used for forming a bottom.
  • FIG. I a flattened tubular foil portion 1 with longitudinal edges 2 and 3, a front wall 4 and a backwall 5 is represented.
  • the end edges 6 and 7 of the front and backwall 4 and 5 extend aslant with respect to the longitudinal edges 2 and 3 of the tubular foil.
  • a longitudinal incision 8 is provided in the walls d and 5 of the tubular foil 1, the incision terminating in the end point 9 of the incision.
  • the part 1 of the tubular foil is unfolded by folding the front and backwall t and 5 about a folding line 16) which extends in the portion of the tubular foil situated outside of the longitudinal incision d.
  • a valve 11 On folding the foil a valve 11 is formed which on the longitudinal edge 3 ends in an intersection 10! while on the other side of the tubular foil a triangular face 12 is formed. Also the bottom flaps Ma, Mb are formed.
  • the aforementioned bag may be manufactured in an inexpensive way since on blanking out already a tubular foil portion with aslant extending end edges 6 and 7 may be directly obtained without the formation of waste, the material being completely converted into a bag. Due to the inclined edges 6 and '7 a very strong sealed bottom is obtained with less material than in case of straight edges.
  • An important embodiment is distinguished in that instead of continuous sealed joints 22, 23 same are discontinuous, while also second likewise discontinuous sealed joints 22a and 23a are provided. In this way a proper deaeration is always possible since the air in the bag can easily escape between the sealed joints. If desired a foam plastic or nonwoven material 24 can be provided between the sealed joints 22 and 22a, 23 and 230, or 220 and 23a, respectively in order to prevent solid substance from disappearing through these openings.
  • FIGS. 5 to 8 is likewise started from a tubular foil portion I with slanting end edges 6 and 7, a front and backwall 4 and 5 and an incision 8 with end point 9 whilst forming a first corner flap Ill, but on the other hand at some distance from the longitudinal edge 2 is also provided an incision ending in the point 26, the connecting line 27 between the end points 9 and 26 of the incisions extending almost perpendicularly to the longitudinal edges 2 and 3 of the tubular foil. Unfolding is here likewise effected about the folding line it) situated in the area of the tubular foil portion next to the connecting line 27 whereby corner flaps ll, 29, and bottom flaps 114a, Mb are formed.
  • bottom flaps Ma Mb are folded together with a portion of the comer flaps 11 and 29, about the line 13a, 13b extending in the area next to the connecting line 27 and at a short distance thereof.
  • the end edges 29a, 2% come to lie under the corner flaps.
  • This bag is very suitable for the purpose of manufacturing plastic bags whilst using small quantities of material, the
  • the desired bag fitted with a valve is obtained due to the provision of the welded joints 33, 34 according to the end edges 6 and 7, and the sealed joint 32 in the vicinity of the end edges 25a, 25b and the edges 84, 8b of the incisions 8.
  • a triangular portion 30 of the corner flap 29' beside the incision 25 can be efficiently removed whilst forming a corner flap edge 35.
  • the corner flap 11" of the bag is longer than the corner flap 29', while the bottom flaps Ma", Mb" are shorter than the corner flap 11", but longer than the corner flap 29'.
  • valves having right ends are not preferable in case of filling said bags with coarse hard materials, involving the use of short filling tubes of the filling machines, it is recommended to remove a part 42 from valve 11". This will result in a valve having a V form.
  • the part serving as a filling valve in the bag has difficulty in adapting itself to the bottom so that no desired adequate closure is guaranteed.
  • This drawback may be removed by subjecting part 11' to a cross stretching action and/or is provided with superficial lines of incision 36. As a result thereof the valve part ll' becomes more flexible. It is specially advisable to subject the end part 36 of the flap 11" to a cross-stretching treatment so that said end part 36 becomes thinner and adapts itself better to the bottom 37, while moreover when filling material presses against the flap part 36 channels 38 remain between part 36 and bottom 37, connecting the mouth of the valve and the interior of the bag.
  • the stretching and or the provision with superficial incision lines may be effected by means of a member consisting of clamping members 39 and two parts provided with toothing 40 and 41. On moving the toothings toward one the other the plastic material of valve portion 36 will be stretched.
  • the toothing may for instance have a sharp edge, however in such a way that exclusively superficial incisions are formed and the material is not cut through.
  • the superficial incisions of the surface of the foil may also be provided by means of cutters, which only very superficially touch the surface of the foil.
  • the sealed joints 32, 33 and 34 (and all other joints if necessary) are obtained by means of a separating member 44 (with sealing bars 44a, 44b and 44c (FIG. 14) and a sealing member 43 (with sealing bars 43a, 43b and 430).
  • Sealing member 43 and sealing member 44 are hingedly connected. After providing the separating member between the valve and the bottom flaps situated thereabove, or between the bottom flaps together with corner flaps and the walls of the bag. By heating sealing bars 43a-c and sealing bars 44ac heat is supplied to both sides of the layers forming the bottom resulting into excellent seals e.g. 32, 33, 34.
  • a method for manufacturing a plastic bag, whether or not provided with a filling valve, from a tubular foil by making from one end of the tubular foil at least one incision whilst forming a first corner flap between the longitudinal incision and the longitudinal edge of the tubular foil which is nearest thereto, whereupon the bottom flap portions situated on the other side beside the longitudinal incision are folded outwards about a folding line extending in the tubular foil portion next to the point of incision, and folding inwards the bottom flaps about a transverse folding line situated between the folding line and the line extending perpendicularly to the longitudinal edges of the tubular foil and through the end point of the longitudinal incision, and making connections in order to connect the bottom flap portions wherein the starting point is a tubular foil wherein the end edges of the bottom flap portions situated beside the incision extend, at least from the incision, partially aslant with respect to the longitudinal edges of the tubular foil, and the bottom flap portions are inwards folded about a crossfolding line situated between the folding line and the line
  • the starting point is a tubular foil provided with two longitudinal incisions in the vicinity of the one, the second longitudinal edge of the tubular foil, respectively the end edges of the bottom flaps extending aslant at least between the longitudinal incisions.
  • welded or glued joints which may consist of one or more partially interrupted sealed joints obtained by applying heat to both sides of the stack of foil layers to be connected.
  • a method according to claim ll wherein a layer impermeable for solid substances and letting a gas through is provided between the discontinuous sealed joints.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Making Paper Articles (AREA)
  • Bag Frames (AREA)
US866427A 1968-10-10 1969-10-07 Method for manufacturing a plastic block bag Expired - Lifetime US3590698A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL6814532A NL6814532A (en) 1968-10-10 1968-10-10 Block-shaped plastic bags prodn.
NL6905187A NL6905187A (en) 1969-04-02 1969-04-02 Block-shaped plastic bags prodn.

Publications (1)

Publication Number Publication Date
US3590698A true US3590698A (en) 1971-07-06

Family

ID=26644361

Family Applications (1)

Application Number Title Priority Date Filing Date
US866427A Expired - Lifetime US3590698A (en) 1968-10-10 1969-10-07 Method for manufacturing a plastic block bag

Country Status (7)

Country Link
US (1) US3590698A (fr)
BE (1) BE740034A (fr)
DE (1) DE1950889B2 (fr)
FR (1) FR2020342A1 (fr)
GB (1) GB1292038A (fr)
IE (1) IE33932B1 (fr)
SE (1) SE373330B (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3785547A (en) * 1970-06-17 1974-01-15 Wavin Bv Plastic block bag with a valve
US5152735A (en) * 1990-02-15 1992-10-06 Podd Jr Victor I Bracing system for a liner for a cargo container

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3248042A (en) * 1962-12-26 1966-04-26 Union Carbide Corp Thermoplastic bag

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3248042A (en) * 1962-12-26 1966-04-26 Union Carbide Corp Thermoplastic bag

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3785547A (en) * 1970-06-17 1974-01-15 Wavin Bv Plastic block bag with a valve
US5152735A (en) * 1990-02-15 1992-10-06 Podd Jr Victor I Bracing system for a liner for a cargo container

Also Published As

Publication number Publication date
FR2020342A1 (fr) 1970-07-10
DE1950889B2 (de) 1973-11-08
SE373330B (sv) 1975-02-03
DE1950889C3 (fr) 1974-05-30
IE33932B1 (en) 1974-12-11
GB1292038A (en) 1972-10-11
BE740034A (fr) 1970-03-16
DE1950889A1 (de) 1970-09-17
IE33932L (en) 1970-04-10

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