GB2076736A - Manufacture of plastics bags - Google Patents

Manufacture of plastics bags Download PDF

Info

Publication number
GB2076736A
GB2076736A GB8017612A GB8017612A GB2076736A GB 2076736 A GB2076736 A GB 2076736A GB 8017612 A GB8017612 A GB 8017612A GB 8017612 A GB8017612 A GB 8017612A GB 2076736 A GB2076736 A GB 2076736A
Authority
GB
United Kingdom
Prior art keywords
plastics
strip
web
plastics material
header section
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Withdrawn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
GB8017612A
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.)
Coles Walter & Co Ltd
Original Assignee
Coles Walter & Co 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 Coles Walter & Co Ltd filed Critical Coles Walter & Co Ltd
Priority to GB8017612A priority Critical patent/GB2076736A/en
Publication of GB2076736A publication Critical patent/GB2076736A/en
Withdrawn legal-status Critical Current

Links

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
    • B31B70/26—Folding sheets, blanks or 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
    • 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
    • B31B2155/001—Flexible containers made from webs by folding webs longitudinally
    • 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
    • B31B2155/001—Flexible containers made from webs by folding webs longitudinally
    • B31B2155/0014—Flexible containers made from webs by folding webs longitudinally having their openings facing transversally to the direction of movement
    • 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
    • B31B2160/10—Shape of flexible containers rectangular and flat, i.e. without structural provision for thickness of contents
    • B31B2160/106—Shape of flexible containers rectangular and flat, i.e. without structural provision for thickness of contents obtained from sheets cut from larger sheets or webs before finishing the bag forming operations
    • 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
    • B31B70/14—Cutting, e.g. perforating, punching, slitting or trimming
    • B31B70/20—Cutting sheets or blanks
    • 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
    • B31B70/61—Uniting opposed surfaces or edges; Taping by applying or securing strips or tape
    • 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
    • B31B70/81—Forming or attaching accessories, e.g. opening devices, closures or tear strings
    • B31B70/812—Applying patches, strips or strings on sheets or webs
    • B31B70/8123—Applying strips

Landscapes

  • Making Paper Articles (AREA)

Abstract

A method for the manufacture of plastics bags having a header section, comprises feeding a web 1 of a plastics material from a supply means 2 to a folding frame 3, feeding a continuous strip 4 of a plastics material from a supply means to the said folding frame 3, centre folding the web 1 around the strip 4, passing the composite folded web to a sealing station 7, sealing the composite folded web along spaced seal lines extending transversely of the direction of movement to form a plurality of open-ended bags 12 each having a header section formed from the strip 4. <IMAGE>

Description

SPECIFICATION Method for the manufacture of plastics bags The present invention relates to a method for the manufacture of plastics bags which include a header section, and to plastics bags made thereby.
Plastics bags having a so-called "header" section are known. The header section usually serves the purpose of identifying the content of the bag and it may also be provided with a hole or slit, or with a tab extending from the edge thereof, which can be used to suspend the bag on display.
In the known bags of this type the header section is generally either formed from a cardboard strip which is stapled or otherwise attached to the plastics bag, or is formed from a section of stronger material which extends from one wall of the bag and which is heat sealed to the opposite wall of the bag over the edge of which it is folded.
The manufacture of such bags invoives several steps which are concerned solely with the production of the header section and there is thus a need for a simple and efficient method for the production of plastics bags which include a header section.
Accordingly, the present invention provides a method for the manufacture of plastics bags having a header section, which method comprises feeding a web of a plastics material from a first supply means to a folding frame, feeding a continuous strip of a plastics material from a second supply means to the said folding frame center folding the web of plastics material around the strip of plastics material, passing the composite folded web to a sealing station, sealing the composite folded web along spaced seal lines extending transversely of the direction of movement to form a plurality of open-ended bags each having a header section formed from the said strip of plastics material.
The continuous strip of plastics material may be fed to the folding frame either in a manner such that a single thickness is enclosed by the plastics web, or in a manner such that the strip is itself folded by the folding frame so that a double thickness is enclosed by the plastics web. A plurality of continuous strips may, if desired, be fed to the folding frame although for cost reasons the use of a single strip is usually preferred. It will be understood that the strip of plastics may either be plain or may be printed, for example with information concerning the article to be placed inside the bag.
The web of plastics material and the continuous strip of plastics material are preferably both formed from a thermoplastict material such as polyethylene or polypropylene having a film thickness in the range of from 0.02 to 0.25 microns. The width of the web of plastics material will vary according to the size of the plastics bag being manufactured an 800 millimitre wide web providing bags 400 millimetres in depth. The width of the strip which forms the header section will partly depend upon whether or not the strip is folded but generally will be in the range of from 25 to 100 millimetres.
In carrying out the method of the invention the transverse seals are formed by any method known in the art, such as the hot knife method or side seal method.
Preferably, a longitudinal seal is also formed adjacent the strip of plastics material which forms the header section and in this case an additional sealing station is required either positioned before or after the sealing station for forming the transverse seals. Furthermore, it may also be desired to form one or more holes in the header section and this is achieved by means of a suitably positioned hole puncher.
It may also be desirable to provide perforations in the body portion of the bag so that air can escape therefrom and such preparations may be introduced by known methods.
The present invention also includes within its scope a plastics bag whenever prepared by the method.
The present invention will be further described with reference to the accompanying drawings, in which: Figure 1 is a plan view, in schematic form, showing apparatus for carrying out the method of the invention; and Figure 2 is a plan view of a bag prepared in accordance with the invention.
Referring to Figure 1, a single thickness plastics sheet 1 is fed from a supply means 2 to a folding frame 3. A continuous strip 4 of a single thickness plastics material is also fed to the folding frame 3.
The plastics sheet 1 and continuous strip 4 are both centre folded by the folding frame 3 to form a centre folded sheet 5 which is folded about the centre folded header strip 6. The composite folded sheet is then passed first to a sealing station 7 where a longitudinal seal 8 is formed adjacent the header strip 6 and after to a hole punching station 9 where holes 10 are punched. The composite folded web is then passed to a sealing station 11 where transverse seals are formed using a hot knife which at the same time severs the bags one from another. The open-ended bags 1 2 are than passed to a stacking station 1 3 where they are stacked.
Referring to Figure 2, an open-ended bag 1 5 has side walls 16 and 17 and an open end 18. The side walls are sealed to one another at the edges thereof. The header section 1 9 of the bag has a strip of plastics material inserted in between the side wall sheets. A seal 20 is formed adjacent the header section and the header section is provided with a hole 21.
1. A method for the manufacture of plastics bags having header section, which method comprises feeding a web of a plastics material from a supply means to a folding frame, feeding a continuous strip of a plastics material from a second supply means to the said folding frame, centre
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (12)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Method for the manufacture of plastics bags The present invention relates to a method for the manufacture of plastics bags which include a header section, and to plastics bags made thereby. Plastics bags having a so-called "header" section are known. The header section usually serves the purpose of identifying the content of the bag and it may also be provided with a hole or slit, or with a tab extending from the edge thereof, which can be used to suspend the bag on display. In the known bags of this type the header section is generally either formed from a cardboard strip which is stapled or otherwise attached to the plastics bag, or is formed from a section of stronger material which extends from one wall of the bag and which is heat sealed to the opposite wall of the bag over the edge of which it is folded. The manufacture of such bags invoives several steps which are concerned solely with the production of the header section and there is thus a need for a simple and efficient method for the production of plastics bags which include a header section. Accordingly, the present invention provides a method for the manufacture of plastics bags having a header section, which method comprises feeding a web of a plastics material from a first supply means to a folding frame, feeding a continuous strip of a plastics material from a second supply means to the said folding frame center folding the web of plastics material around the strip of plastics material, passing the composite folded web to a sealing station, sealing the composite folded web along spaced seal lines extending transversely of the direction of movement to form a plurality of open-ended bags each having a header section formed from the said strip of plastics material. The continuous strip of plastics material may be fed to the folding frame either in a manner such that a single thickness is enclosed by the plastics web, or in a manner such that the strip is itself folded by the folding frame so that a double thickness is enclosed by the plastics web. A plurality of continuous strips may, if desired, be fed to the folding frame although for cost reasons the use of a single strip is usually preferred. It will be understood that the strip of plastics may either be plain or may be printed, for example with information concerning the article to be placed inside the bag. The web of plastics material and the continuous strip of plastics material are preferably both formed from a thermoplastict material such as polyethylene or polypropylene having a film thickness in the range of from 0.02 to 0.25 microns. The width of the web of plastics material will vary according to the size of the plastics bag being manufactured an 800 millimitre wide web providing bags 400 millimetres in depth. The width of the strip which forms the header section will partly depend upon whether or not the strip is folded but generally will be in the range of from 25 to 100 millimetres. In carrying out the method of the invention the transverse seals are formed by any method known in the art, such as the hot knife method or side seal method. Preferably, a longitudinal seal is also formed adjacent the strip of plastics material which forms the header section and in this case an additional sealing station is required either positioned before or after the sealing station for forming the transverse seals. Furthermore, it may also be desired to form one or more holes in the header section and this is achieved by means of a suitably positioned hole puncher. It may also be desirable to provide perforations in the body portion of the bag so that air can escape therefrom and such preparations may be introduced by known methods. The present invention also includes within its scope a plastics bag whenever prepared by the method. The present invention will be further described with reference to the accompanying drawings, in which: Figure 1 is a plan view, in schematic form, showing apparatus for carrying out the method of the invention; and Figure 2 is a plan view of a bag prepared in accordance with the invention. Referring to Figure 1, a single thickness plastics sheet 1 is fed from a supply means 2 to a folding frame 3. A continuous strip 4 of a single thickness plastics material is also fed to the folding frame 3. The plastics sheet 1 and continuous strip 4 are both centre folded by the folding frame 3 to form a centre folded sheet 5 which is folded about the centre folded header strip 6. The composite folded sheet is then passed first to a sealing station 7 where a longitudinal seal 8 is formed adjacent the header strip 6 and after to a hole punching station 9 where holes 10 are punched. The composite folded web is then passed to a sealing station 11 where transverse seals are formed using a hot knife which at the same time severs the bags one from another. The open-ended bags 1 2 are than passed to a stacking station 1 3 where they are stacked. Referring to Figure 2, an open-ended bag 1 5 has side walls 16 and 17 and an open end 18. The side walls are sealed to one another at the edges thereof. The header section 1 9 of the bag has a strip of plastics material inserted in between the side wall sheets. A seal 20 is formed adjacent the header section and the header section is provided with a hole 21. CLAIMS
1. A method for the manufacture of plastics bags having header section, which method comprises feeding a web of a plastics material from a supply means to a folding frame, feeding a continuous strip of a plastics material from a second supply means to the said folding frame, centre folding the web of plastics material around the strip of plastics material, passing the composite folded web to a sealing station, sealing the composite folded web along spaced seal lines extending transversely of the direction of movement to form a plurality of open-ended bags each having a header section formed from the said strip of plastics material.
2. A method as claimed in claim 1 wherein the continuous strip of plastics material is fed to the folding frame in such a manner that a single thickness is enclosed by the plastics web.
3. A method as claimed in claim 1 wherein the continuous strip of plastics material is fed to the folding frame in such a manner that the strip is folded by the folding frame and a double thickness is enclosed by the plastics web.
4. A method as claimed in any one of the preceding claims wherein the strip is a printed strip.
5. A method as claimed in any one of the preceding claims wherein the web of plastics material is made of polyethylene or polypropylene film.
6. A method as claimed in any one of the preceding claims wherein the continuous strip of plastics material is made of polyethylene or polypropylene film.
7. A method as claimed in claim 5 or claim 6 wherein the film has a thickness in the range of from 0.02 to 0.25 microns.
8. A method as claimed in any one of the preceding claims wherein the transverse seals are formed by the hot knife method or the side seal method.
9. A method as claimed in any one of the proceding claims wherein a longitudinal seal is formed adjacent the header section.
1 0. A method as claimed in any one of the preceding claims wherein one or more holes are formed in the header section.
11. A method as claimed in any one of the preceding claims wherein perforations are provided in the body portion of the bag.
12. A method as claimed in claim 1 substantially as hereinbefore described with reference to and as illustrated in Figure 1 of the accompanying drawings.
1 3. A plastic bag whenever produced by a method as claimed in any one of the preceding claims.
GB8017612A 1980-05-29 1980-05-29 Manufacture of plastics bags Withdrawn GB2076736A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8017612A GB2076736A (en) 1980-05-29 1980-05-29 Manufacture of plastics bags

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8017612A GB2076736A (en) 1980-05-29 1980-05-29 Manufacture of plastics bags

Publications (1)

Publication Number Publication Date
GB2076736A true GB2076736A (en) 1981-12-09

Family

ID=10513710

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8017612A Withdrawn GB2076736A (en) 1980-05-29 1980-05-29 Manufacture of plastics bags

Country Status (1)

Country Link
GB (1) GB2076736A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3622968A1 (en) * 1986-07-09 1988-02-04 Lehmacher & Sohn Masch Process and device for the continuous production of packaging bags
DE3644618A1 (en) * 1986-12-29 1988-07-07 Mildenberger & Willing Verpack Portable packaging bag made of plastic film with an integrally moulded-on handle part
GB2212476A (en) * 1987-11-19 1989-07-26 Stonehaven Packaging Products Bag

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3622968A1 (en) * 1986-07-09 1988-02-04 Lehmacher & Sohn Masch Process and device for the continuous production of packaging bags
DE3644618A1 (en) * 1986-12-29 1988-07-07 Mildenberger & Willing Verpack Portable packaging bag made of plastic film with an integrally moulded-on handle part
GB2212476A (en) * 1987-11-19 1989-07-26 Stonehaven Packaging Products Bag

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)