EP0155100A1 - Fabrication de sacs à plis latéraux - Google Patents

Fabrication de sacs à plis latéraux Download PDF

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Publication number
EP0155100A1
EP0155100A1 EP85301157A EP85301157A EP0155100A1 EP 0155100 A1 EP0155100 A1 EP 0155100A1 EP 85301157 A EP85301157 A EP 85301157A EP 85301157 A EP85301157 A EP 85301157A EP 0155100 A1 EP0155100 A1 EP 0155100A1
Authority
EP
European Patent Office
Prior art keywords
sack
adhesive
gusseted
bottomer
applying
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.)
Withdrawn
Application number
EP85301157A
Other languages
German (de)
English (en)
Inventor
Denis Gerald Crosby
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.)
Nampak Products Ltd
Original Assignee
Nampak Products Ltd
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 Nampak Products Ltd filed Critical Nampak Products Ltd
Publication of EP0155100A1 publication Critical patent/EP0155100A1/fr
Withdrawn legal-status Critical Current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
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/60—Uniting opposed surfaces or edges; Taping
    • B31B70/62—Uniting opposed surfaces or edges; Taping by adhesives
    • 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

Definitions

  • This invention relates to the manufacture of pinch bottom gusseted sacks and also to machinery for such manufacture.
  • a method of manufacturing a pinch bottomed gusseted sack includes the step of applying temporary adhesive means to the inside faces of the gusset prior to feeding it to the feeder mechanism of a valve bottomer machine.
  • valve bottomer machine includes a station for applying an adhesive such as a liquid adhesive, to the sack at the so-called "factory end" which is then folded on itself and compressed to complete the seal.
  • an adhesive such as a liquid adhesive
  • the machine will also include a station for the application of a molten thermoplastic adhesive composition (hot melt).
  • the temporary adhesive is applied in the form of a number of spots along the inner faces of the gusset. For most applications three spots will suffice. These spots must be applied during the "tubing" operation.
  • the spots allow the gusset to be opened by the customer when desired and, in fact the spots may be unbonded during the filling operation of the sack. Preferably the spots are small so that minimal damage to the sack occurs when the gussets are opened.
  • the feeder mechanism of the valve bottomer machine preferably has a conventional suction feed device which picks up a sack along its gusset by suction.
  • the adhesive inside the folds of the gusset prevents the gusset from opening as it is picked up.
  • an apparatus for manufacturing pinch bottomed gusseted sack is shown as including a tubing machine 10 and a paper sack bottomer 12.
  • Paper is fed from rolls into the tube forming section 14 where an endless band of paper is formed as a tube having gussets disposed at either sides.
  • the tube is formed by applying an adhesive in the longitudinal seams of the paper after which pressure is applied. Spaced apart spots of adhesive 16 are applied between the folds of the gusset 17 for temporary fixing.
  • a separating section is - incorporated in the station 16 where the tube is parted into predetermined lengths.
  • the tubes are fed into a rotary double feeder 18 in which each tube is individually picked up by suction cups along the gusseted edge and a thermoplastic adhesive is applied at the station 20 in the form of a band 22 at the customer end of the sack.
  • a band 24 of a liquid adhesive is applied and the bottom is folded over to finish the manufacturing process.
  • the sacks are then fed on a delivery conveyor 26 for despatch.
  • An advantage of the invention is that temporary fixing of the folds of the gusset enables pinch bottom sacks to be- manufactured on conventional paper sack valve bottomer machines at a much higher speed than was possible in the prior art.

Landscapes

  • Bag Frames (AREA)
  • Making Paper Articles (AREA)
EP85301157A 1984-02-21 1985-02-21 Fabrication de sacs à plis latéraux Withdrawn EP0155100A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA848662 1984-02-21
ZA848662 1984-02-21

Publications (1)

Publication Number Publication Date
EP0155100A1 true EP0155100A1 (fr) 1985-09-18

Family

ID=25577587

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85301157A Withdrawn EP0155100A1 (fr) 1984-02-21 1985-02-21 Fabrication de sacs à plis latéraux

Country Status (2)

Country Link
EP (1) EP0155100A1 (fr)
AU (1) AU3903885A (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2871771A (en) * 1952-06-12 1959-02-03 Milprint Inc Art of producing side-gusseted bags
GB1239906A (en) * 1967-09-19 1971-07-21 Robinson E S & A Ltd A method of making bags of paper or like sheet material
DE3043491A1 (de) * 1980-11-18 1982-06-09 Natronag Papierproduktion Gmbh & Co, Papiersackfabriken Kg, 3380 Goslar Seitenfaltenschlauch und verfahren zum transport von seitenfaltenschlaeuchen

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2871771A (en) * 1952-06-12 1959-02-03 Milprint Inc Art of producing side-gusseted bags
GB1239906A (en) * 1967-09-19 1971-07-21 Robinson E S & A Ltd A method of making bags of paper or like sheet material
DE3043491A1 (de) * 1980-11-18 1982-06-09 Natronag Papierproduktion Gmbh & Co, Papiersackfabriken Kg, 3380 Goslar Seitenfaltenschlauch und verfahren zum transport von seitenfaltenschlaeuchen

Also Published As

Publication number Publication date
AU3903885A (en) 1985-09-05

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Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): AT BE CH DE FR GB IT LI LU NL SE

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19860521

RIN1 Information on inventor provided before grant (corrected)

Inventor name: CROSBY, DENIS GERALD