WO2004103841A1 - Method for producing window packaging bags and products fabricated with the method - Google Patents

Method for producing window packaging bags and products fabricated with the method Download PDF

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Publication number
WO2004103841A1
WO2004103841A1 PCT/FI2004/000300 FI2004000300W WO2004103841A1 WO 2004103841 A1 WO2004103841 A1 WO 2004103841A1 FI 2004000300 W FI2004000300 W FI 2004000300W WO 2004103841 A1 WO2004103841 A1 WO 2004103841A1
Authority
WO
WIPO (PCT)
Prior art keywords
web
bag
strip
accordance
plastic film
Prior art date
Application number
PCT/FI2004/000300
Other languages
Finnish (fi)
French (fr)
Inventor
Pauli BORÈN
Osmo HAUTAMÄKI
Kari SIRÈN
Ari-Pekka PIETILÄ
Original Assignee
Suominen Flexible Packaging 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 Suominen Flexible Packaging Ltd. filed Critical Suominen Flexible Packaging Ltd.
Publication of WO2004103841A1 publication Critical patent/WO2004103841A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/02—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by features of form at particular places, e.g. in edge regions
    • 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
    • B31B70/82—Forming or attaching windows
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/10—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of paper or cardboard
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • 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
    • B65D31/02—Bags or like containers made of paper and having structural provision for thickness of contents with laminated walls
    • 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
    • B65D33/00—Details of, or accessories for, sacks or bags
    • B65D33/04—Windows or other apertures, e.g. for viewing contents
    • 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
    • B65D33/00—Details of, or accessories for, sacks or bags
    • B65D33/14—Suspension means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/30—Properties of the layers or laminate having particular thermal properties
    • B32B2307/31—Heat sealable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2439/00—Containers; Receptacles

Definitions

  • the invention concerns a method for producing a windowed packing bag for retail sale packages of especially food products, such as bakery products.
  • the invention also concerns a prefabricated product for producing the bag and the ultimate bag itself.
  • the outside of the bag concerned consists mainly of paper, except for said window, which usually extends strip-like over one side of the bag.
  • the usual application for the packing bag concerned is a so called wicket bag, where one edge of the filling aperture is extended to a hanging strip, from which hanging position the bag can be torn off after filling.
  • Packing bags provided with a window extending over one side of the bag are known in the art.
  • the material of the bag is mainly paper, which has been prefabricated according to the packing purpose.
  • the window consists of a plastic film strip, which is joined between two edges of the paper separated from each other. A window formed in this way extends in cross-direction to the filling edge of the bag.
  • Blanks for these bags can be produced of a paper web, with a window strip made of said plastic film material being attached thereto. The edges of the web are joined in order to form a tube to be cross-cut into lengths required by respective packing bag.
  • one of the two cutting lines can be sealed, for instance by gluing the opposite portions of the web together. The other cutting line forms thereby the filling aperture of the bag, which will then be sealed in a suitable manner after filling the bag, for instance with said gluing procedure, usually, however, with an appropriate sealing clip. It is also possible that both of the cutting lines are closed only after the filling step.
  • a method for producing a windowed bag where the bag blank is punched from a paper web in cross-direction.
  • the edges of the web are turned towards each other, at a distance of the window width.
  • the edges are connected across this intermediate space by means of a plastic film strip, which is attached to the opposite edges of the web with glue.
  • One of the punched cutting edges is designed for forming the bottom part of the bag.
  • the other punched cutting edge is designed so as to form the closing flap defining the packing aperture of the bag.
  • the window extends over the package from the bottom edge to the filling edge.
  • the manufacturing technique does not prevent providing of the packing bag with several parallel window strips.
  • bag packages where the window strip extends parallel with the bottom and filling aperture of the bag across one half of the package.
  • the different strips have been formed of material strips joined with each other at their edges, like printed strips that have been joined to the transparent window strip or strips.
  • the basic strip is transparent plastic film for hot sealing, the bag blank being formed of it by folding the halves of the film strip against each other. The fold line of the halves forms the bottom fold of the bag.
  • a paper strip or a plurality of paper strips having a width narrower than the bag, at a distance from each other, are laminated to one side of the plastic strip prior to the formation steps of the bag, said side forming the outer surface of the ultimate bag, so that a portion of the plastic film strip remains uncovered.
  • the uncovered portion of the plastic strip forms the future window or windows of the bag.
  • the side edges of the bag are seamed by connecting the edges of the film strip by means of a plastic band to be attached thereto.
  • the blastic band can be made of the same material as the plastic material of the basic strip.
  • a tear-off strip is proposed to be formed to one edge of the filling apertune, said tear-off strip being formed by an uncovered edge portion of the plastic strip.
  • the tear-off strip is equipped with tear-off perforation.
  • the tear-off strip can also be used for combining the separate bags to bag bunches to be used on the packing site.
  • the window in this construction can be arranged parallel with the filling aperture, as disclosed in French patent application 2 430 362.
  • the production technique is based on single production of the bags with many working steps, the connection of the side seams with a separate connection strip is complicated as a working step.
  • the method in accordance with the present invention provides a windowed bag package, said package having a simple production technique, as a result being a package with a firm basic construction to protect the packed article well and to have a visual effect of a packing material traditionally considered to have favourable features with respect to the packed article.
  • the bag blanks are produced of a continuous web comprising at least one window strip parallel with the web, by forming in cross-direction to the web a fold overlapping at least for a substantial part thereof to form the bag blanks, and the bag planks are sealed to bags in cross-direction to the web, in accordance with the characterizing features of the invention, so that at least in the portion of the web to be folded overlapping, a uniform plastic film is used, having at least one narrower strip of another material laminated onto it, said strip extending parallel with the web, and that the web halves are folded so that the film surfaces come against each other.
  • the uniform plastic film used for forming the substantial portion of the packing bag makes the construction tensile, which is apparent among other t ings in the production process having less tearing problems.
  • the desired window for the bag can be formed of the film, said window being defined by suitable material strips laminated onto the plastic film to give a material visual effect. These strips also give stiffness of shape to the package.
  • Figure 1 shows one material web alternative for producing packing bags in accordance with the present invention
  • Figure 2 shows as a schematic drawing one embodiment of the invention as a wicket bag.
  • Figure 1 shows a schematic drawing of a continuous web for producing packin bags.
  • Web 1 is in the situation of the figure already in a condition, where the halves thereof have been folded against each other.
  • the web consists of a film of a suitable plastic material, on which paper strips 2, 2' parallel with the web, extending at a distance from each other, have been laminated by gluing technique.
  • the lower edge 3 can be a folded edge the web halves being folded around it. Thereby the upper edge 4 of the web remains open.
  • the web halves have been folded so that the plastic film surfaces of the halves are against each other.
  • the correct selection of material enables in step 5 the seaming of the bag blanks in cross-direction to the web 1 by means of hot sealing. In connection with seaming, the bag blanks can be separated from each other into separate bags by cutting them along the seam line.
  • the cutting of the bags can also be performed partially, whereby the bags remain partly connected and form a uniform chain of bags.
  • the side sealing and separation can be left totally out from the production phase.
  • the laminate produced with the method in accordance with the present invention can be rolled up and used on the filling site of the bags. On the filling site of the bags the laminate roll will be opened, sides of the bags will be seamed, the bags will be filled up and separated from each other on the packing line.
  • the strip 6 for forming the window is formed by leaving the paper layer for that part unlaminated on top of the plastic film.
  • the window can also extend on the opposite side of the packing bag, again depending on the usage, whereby the windows will be arranged on both sides of the package.
  • the upper part of the bag chain that is the edge towards the filling apertures of the bags
  • the upper part of the bag chain can be formed for instance so that after folding the laminate, the both free edges of the laminate parallel with the machine direction are folded once to inside and the edge of the fold is sealed.
  • Both edges of the bag chain can be provided with a continuous pipe-like channel parallel with the machine direction.
  • formed bag chain can be drawn at its upper edges to the two feeding bars of the packing machine so, that the feeding bars travel inside the pipe-like channel.
  • the apertures of the bags in the chain are opened for filling.
  • the filling apertures of the bags can be seamed after filling and cut below the feeding bars as desired.
  • the laminate for the packing bags produced with the method of the invention enables the machined packing in accordance with the embodiment described afore for instance in bakeries.
  • a method in accordance with the present invention a package is provided, the visual effect of which being suitable for packing the bakery products and having a basic construction sufficiently strong for machined packing.
  • wicket bags can advantageously be produced with this method, said wicket bags being described as an example in figure 2.
  • the bag is produced of a web in accordance with figure 1 so that the halves of the web are not extended exactly on top of each others, but a strip 7 is left to the open portion 4 of the web, said strip being comprised of a single web.
  • the strip will be perforated 8 with a suitable spacing for the wicket hanging.
  • the wicket strip 7 can be produced either of the basic film of the web 1, of the basic film laminated with paper or only of the paper portion of the web. The choosing depends on the article to be packed into the bag and on the suitable tearing strength chosed for the bag to be teared off from the wicket spikes.
  • plastic film to be used for the package a suitable single-layer or laminated plastic film will be used.
  • the laminated plastic film can be formed of different material layers.
  • Preferable plastic materials include hot sealed plastics like polyethylene, polypropylene, polyethyleneterephtalat etc.
  • the other material to be laminated on said film is preferably paper, but it can also be some other web material giving a desired visual effect and feel to the package. It will be laminated onto the plastic film or onto the plastic film laminate by using traditional lamination technique, whereby the lamination joint is suitably achieved by gluing.
  • the gluing can be used without problems, because the glue surface always stays in the package outside the plastic film thus causing no problems with respect to the product to be packed.
  • the packing bag can be provided with different permeation features having significantly wider modifying alternatives compared i.a. to paper.
  • the bag produced with the method of the present invention can be sealed with a clip, but the construction thereof also enables closing by hot sealing after the packing, whereby the use of different closing clips can be avoided and the sealing will be essentially more proof, if required.
  • the bag to be produced can be formed, if needed, for the part of the folded edge 3 (Figure 1) of its bottom as a multi-stage fold, or it can be formed according to some other desired design.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bag Frames (AREA)

Abstract

The invention concerns producing of windowed packaging bags. The bag blanks are produced of a continuous web comprising at least one window strip extending parallel with the web. A fold for the bag planks being overlapping at least for the substantial part thereof is formed in the cross-direction to the web, and the bag planks are defined to bags in cross-direction to the web. At least in the portion of the web to be folded overlapping, a uniform plastic film is used, at least one narrower strip of another material being laminated onto it, said strip extending parallel with the web. The web halves are folded so that the film surfaces come against each other.

Description

METHOD FOR PRODUCING WINDOW PACKAGING BAGS AND PRODUCTS FABRICATED WITH THE METHOD.
The invention concerns a method for producing a windowed packing bag for retail sale packages of especially food products, such as bakery products. The invention also concerns a prefabricated product for producing the bag and the ultimate bag itself.
The outside of the bag concerned consists mainly of paper, except for said window, which usually extends strip-like over one side of the bag. The usual application for the packing bag concerned is a so called wicket bag, where one edge of the filling aperture is extended to a hanging strip, from which hanging position the bag can be torn off after filling.
Packing bags provided with a window extending over one side of the bag are known in the art. The material of the bag is mainly paper, which has been prefabricated according to the packing purpose. The window consists of a plastic film strip, which is joined between two edges of the paper separated from each other. A window formed in this way extends in cross-direction to the filling edge of the bag.
Blanks for these bags can be produced of a paper web, with a window strip made of said plastic film material being attached thereto. The edges of the web are joined in order to form a tube to be cross-cut into lengths required by respective packing bag. For forming the bag, one of the two cutting lines can be sealed, for instance by gluing the opposite portions of the web together. The other cutting line forms thereby the filling aperture of the bag, which will then be sealed in a suitable manner after filling the bag, for instance with said gluing procedure, usually, however, with an appropriate sealing clip. It is also possible that both of the cutting lines are closed only after the filling step.
On the other hand, also a method for producing a windowed bag is known in the art, where the bag blank is punched from a paper web in cross-direction. The edges of the web are turned towards each other, at a distance of the window width. The edges are connected across this intermediate space by means of a plastic film strip, which is attached to the opposite edges of the web with glue. One of the punched cutting edges is designed for forming the bottom part of the bag. Correspondingly, the other punched cutting edge is designed so as to form the closing flap defining the packing aperture of the bag.
In these windowed packing bags, known in the art, the window extends over the package from the bottom edge to the filling edge. Usually there is one of these window strips, but the manufacturing technique does not prevent providing of the packing bag with several parallel window strips.
Also bag packages are known, where the window strip extends parallel with the bottom and filling aperture of the bag across one half of the package. There can be one strip or multiple strips parallel between the bottom and the filling aperture, and they can extend only over one side of the package or over the both sides. In these packages the different strips have been formed of material strips joined with each other at their edges, like printed strips that have been joined to the transparent window strip or strips.
These solutions known in the art are based on connecting different strips at their edges by sealing. This is of essential importance with respect to the strength and material selections of the package. For instance the hot sealing of less compatible materials often causes situations, where the seam result is not uniform, and it can fail in the use of the package. Especially with packing bags where different materials must be used, the gluing is generally the only usable jointing solution of the strips. Areas of the package treated with glue get inevitably into contact with the article packed into the bag, which especially with packages for wood articles is undesirable.
Known is also a package formed as a windowed bag, produced of strips of different materials having a width of the desired height of the bag and being cut to dimensions of the width of the bag. The basic strip is transparent plastic film for hot sealing, the bag blank being formed of it by folding the halves of the film strip against each other. The fold line of the halves forms the bottom fold of the bag. A paper strip or a plurality of paper strips having a width narrower than the bag, at a distance from each other, are laminated to one side of the plastic strip prior to the formation steps of the bag, said side forming the outer surface of the ultimate bag, so that a portion of the plastic film strip remains uncovered. The uncovered portion of the plastic strip forms the future window or windows of the bag. The side edges of the bag are seamed by connecting the edges of the film strip by means of a plastic band to be attached thereto. The blastic band can be made of the same material as the plastic material of the basic strip. A tear-off strip is proposed to be formed to one edge of the filling apertune, said tear-off strip being formed by an uncovered edge portion of the plastic strip. The tear-off strip is equipped with tear-off perforation. The tear-off strip can also be used for combining the separate bags to bag bunches to be used on the packing site. The window in this construction can be arranged parallel with the filling aperture, as disclosed in French patent application 2 430 362. The production technique is based on single production of the bags with many working steps, the connection of the side seams with a separate connection strip is complicated as a working step.
The method in accordance with the present invention provides a windowed bag package, said package having a simple production technique, as a result being a package with a firm basic construction to protect the packed article well and to have a visual effect of a packing material traditionally considered to have favourable features with respect to the packed article.
In accordance with the method of the present invention, the bag blanks are produced of a continuous web comprising at least one window strip parallel with the web, by forming in cross-direction to the web a fold overlapping at least for a substantial part thereof to form the bag blanks, and the bag planks are sealed to bags in cross-direction to the web, in accordance with the characterizing features of the invention, so that at least in the portion of the web to be folded overlapping, a uniform plastic film is used, having at least one narrower strip of another material laminated onto it, said strip extending parallel with the web, and that the web halves are folded so that the film surfaces come against each other.
The uniform plastic film used for forming the substantial portion of the packing bag makes the construction tensile, which is apparent among other t ings in the production process having less tearing problems. The desired window for the bag can be formed of the film, said window being defined by suitable material strips laminated onto the plastic film to give a material visual effect. These strips also give stiffness of shape to the package.
The invention will now be described in more detail in the following, with reference to the enclosed drawings, wherein
Figure 1 shows one material web alternative for producing packing bags in accordance with the present invention, and
Figure 2 shows as a schematic drawing one embodiment of the invention as a wicket bag.
Figure 1 shows a schematic drawing of a continuous web for producing packin bags. Web 1 is in the situation of the figure already in a condition, where the halves thereof have been folded against each other. For its essential part the web consists of a film of a suitable plastic material, on which paper strips 2, 2' parallel with the web, extending at a distance from each other, have been laminated by gluing technique. In the embodiment of the figure, the lower edge 3 can be a folded edge the web halves being folded around it. Thereby the upper edge 4 of the web remains open. The web halves have been folded so that the plastic film surfaces of the halves are against each other. The correct selection of material enables in step 5 the seaming of the bag blanks in cross-direction to the web 1 by means of hot sealing. In connection with seaming, the bag blanks can be separated from each other into separate bags by cutting them along the seam line.
The cutting of the bags can also be performed partially, whereby the bags remain partly connected and form a uniform chain of bags. Correspondingly, the side sealing and separation can be left totally out from the production phase. The laminate produced with the method in accordance with the present invention can be rolled up and used on the filling site of the bags. On the filling site of the bags the laminate roll will be opened, sides of the bags will be seamed, the bags will be filled up and separated from each other on the packing line.
The strip 6 for forming the window is formed by leaving the paper layer for that part unlaminated on top of the plastic film. There can naturally be multiple parallel window strips between the bottom 3 and the filling aperture 4, depending on the usage of the bags to be produced. Correspondingly, the window can also extend on the opposite side of the packing bag, again depending on the usage, whereby the windows will be arranged on both sides of the package.
In the embodiment of bag chain alternative, the upper part of the bag chain, that is the edge towards the filling apertures of the bags, can be formed for instance so that after folding the laminate, the both free edges of the laminate parallel with the machine direction are folded once to inside and the edge of the fold is sealed. Both edges of the bag chain can be provided with a continuous pipe-like channel parallel with the machine direction. Thus formed bag chain can be drawn at its upper edges to the two feeding bars of the packing machine so, that the feeding bars travel inside the pipe-like channel. When the feeding bars are then separated from each other, the apertures of the bags in the chain are opened for filling. The filling apertures of the bags can be seamed after filling and cut below the feeding bars as desired. The laminate for the packing bags produced with the method of the invention enables the machined packing in accordance with the embodiment described afore for instance in bakeries. With a method in accordance with the present invention a package is provided, the visual effect of which being suitable for packing the bakery products and having a basic construction sufficiently strong for machined packing.
Also the so called wicket bags can advantageously be produced with this method, said wicket bags being described as an example in figure 2. The bag is produced of a web in accordance with figure 1 so that the halves of the web are not extended exactly on top of each others, but a strip 7 is left to the open portion 4 of the web, said strip being comprised of a single web. After the sealing step 5 or in connection with the same, the strip will be perforated 8 with a suitable spacing for the wicket hanging. The wicket strip 7 can be produced either of the basic film of the web 1, of the basic film laminated with paper or only of the paper portion of the web. The choosing depends on the article to be packed into the bag and on the suitable tearing strength chosed for the bag to be teared off from the wicket spikes.
As a plastic film to be used for the package a suitable single-layer or laminated plastic film will be used. The laminated plastic film can be formed of different material layers. Preferable plastic materials include hot sealed plastics like polyethylene, polypropylene, polyethyleneterephtalat etc.
The other material to be laminated on said film is preferably paper, but it can also be some other web material giving a desired visual effect and feel to the package. It will be laminated onto the plastic film or onto the plastic film laminate by using traditional lamination technique, whereby the lamination joint is suitably achieved by gluing. The gluing can be used without problems, because the glue surface always stays in the package outside the plastic film thus causing no problems with respect to the product to be packed.
By modifying the characteristics of the film, the packing bag can be provided with different permeation features having significantly wider modifying alternatives compared i.a. to paper.
The bag produced with the method of the present invention can be sealed with a clip, but the construction thereof also enables closing by hot sealing after the packing, whereby the use of different closing clips can be avoided and the sealing will be essentially more proof, if required.
The bag to be produced can be formed, if needed, for the part of the folded edge 3 (Figure 1) of its bottom as a multi-stage fold, or it can be formed according to some other desired design.

Claims

1. A method for producing windowed packing bags, wherein the bag blanks are produced of a continuous web comprising at least one window strip parallel with the web, by forming in the cross-direction to the web a fold for the bag blanks, said fold being overlapping at least for the substantial part thereof, and the bag planks are seamed to bags in cross-direction to the web, characterized in, that at least in the portion of the web to be folded overlapping, a uniform plastic film is used having at least one narrower strip of another material laminated onto it, said strip extending parallel with the web, and that the web halves are folded so that the film surfaces come against each other.
2. A method in accordance with claim 1, characterized in, that the other material to be laminated is paper.
3. A method in accordance with claim 1, characterized in, that the web halves are fold against each other only partly overlapping in order to form the wicket strip.
4. A method in accordance with claim 1, characterized in, that the wicket strip is formed of the laminated portion of the web.
5. A method in accordance with claim 1, characterized in, that the wicket strip is formed of a non-laminated portion of the web.
6. A method in accordance with claim 1, characterized in, that the cutting lines of the bag blanks are hot seamed.
7. A method in accordance with claim 1, characterized in, that seaming of the bag planks is performed partially, and that the separation areas of the bag blanks will be equipped with a partial separation cut.
8. A paclcing bag having one open pacldng edge and at least one transparent strip (6) extending parallel with the packing edge extending substantially over one side of the bag, said bag being produced of a plastic film laminate by folding it so that the plastic film forms the inner surface of the bag, and said transparent strip being formed of a non-laminated plastic film area, characterized in, that the seams (9, 9') of the packing bag are formed by hot sealing the opposing plastic films on the inside.
9. A packing bag in accordance with claim 8, characterized in, that the plastic film is laminated with paper.
10. A packing bag in accordance with claim 8 or 9, characterized in, that one packing edge is extended to a wicket strip (7).
11. A packing bag in accordance with claim 10, characterized in, that the wicket strip is formed of the plastic film laminate.
12. A pacldng bag in accordance with claim 10, characterized in, that the wicket strip is formed of the cover material of the laminate.
13. A pacldng bag in accordance with claim 10, characterized in, that the wicket strip is formed of the plastic film of the laminate.
14. A blank product for a windowed packing bag, said blank product being produced of a continuous web by forming in the cross-direction to the web a fold for the bag blanks, said fold being overlapping at least for the substantial part thereof, wherein the portion of the web to be folded overlapping comprises a uniform plastic film having at least one narrower strip of another material laminated onto it, said strip extending parallel with the web, characterized in, that the bag blanks are defined by hot sealing in cross- direction to the web.
15. A blank product in accordance with claim 14, characterized in, that the bag blanks are partially separated by a cut exerted to the hot sealing.
16. A prefabricated packing bag comprising a continuous film web, characterized in, that at least one strip of a material different from the material of the plastic film web is laminated onto the plastic film web, said strip being narrower than the plastic film web and extending continuously and parallel with the web.
7. A plastic film web in accordance with claim 16, characterized in, that the material of the strip is paper.
PCT/FI2004/000300 2003-05-21 2004-05-19 Method for producing window packaging bags and products fabricated with the method WO2004103841A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20030762 2003-05-21
FI20030762A FI20030762A (en) 2003-05-21 2003-05-21 Window packing bag

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WO2004103841A1 true WO2004103841A1 (en) 2004-12-02

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Cited By (2)

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US11338538B2 (en) 2016-08-17 2022-05-24 Les Emballages Trium Inc. Process for manufacturing bags for packaging items, and bag produced therefrom
US11794976B2 (en) 2020-07-30 2023-10-24 The Procter And Gamble Company Recyclable absorbent article package material

Families Citing this family (1)

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Publication number Priority date Publication date Assignee Title
CN102730285B (en) * 2012-06-05 2014-06-25 四川美丰化工股份有限公司 Plastic woven packaging bag and manufacturing process thereof

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Publication number Priority date Publication date Assignee Title
US1868069A (en) * 1931-07-16 1932-07-19 Munson John Mitchell Composite bag
FR2430362A1 (en) * 1978-07-05 1980-02-01 Vauzelle Jean Marie Plastic bags partially covered with paper - used for leakproof bags with combination of weldability, stiffness, transparency and ease of marking
US5226735A (en) * 1991-08-28 1993-07-13 Daniel Beliveau Perforated plastic bag for packaging fruits or vegetables
US6033114A (en) * 1998-01-20 2000-03-07 Bagcraft Packaging, L.L.C. Window bag with polyester lining and method of forming same

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1868069A (en) * 1931-07-16 1932-07-19 Munson John Mitchell Composite bag
FR2430362A1 (en) * 1978-07-05 1980-02-01 Vauzelle Jean Marie Plastic bags partially covered with paper - used for leakproof bags with combination of weldability, stiffness, transparency and ease of marking
US5226735A (en) * 1991-08-28 1993-07-13 Daniel Beliveau Perforated plastic bag for packaging fruits or vegetables
US6033114A (en) * 1998-01-20 2000-03-07 Bagcraft Packaging, L.L.C. Window bag with polyester lining and method of forming same

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11338538B2 (en) 2016-08-17 2022-05-24 Les Emballages Trium Inc. Process for manufacturing bags for packaging items, and bag produced therefrom
US11794976B2 (en) 2020-07-30 2023-10-24 The Procter And Gamble Company Recyclable absorbent article package material

Also Published As

Publication number Publication date
FI20030762A0 (en) 2003-05-21
FI20030762A (en) 2004-11-22

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