NL2019405B1

NL2019405B1 - Labelled sack

Info

Publication number: NL2019405B1
Application number: NL2019405A
Authority: NL
Inventors: Christiaan Van Fraassen Boudewijn; Allen Macro Richard
Original assignee: Lc Packaging Int B V
Priority date: 2017-08-08
Filing date: 2017-08-08
Publication date: 2019-02-21

Abstract

The invention. relates to a sack intended. to be filled with bulk goods, such as potatoes and onions, comprising‘ a first woven. wall and. a second. woven. wall, which. walls at a top edge of the sack leave a filling opening open and which have been attached to each other or merge into each other along two longitudinal edges and a bottom edge of the sack, wherein the walls have been formed with. weft threads and. warp threads extending transverse thereto while keeping a distance between the adjacently extending weft threads and adjacently extending warp threads in order to keep airing openings open in between them, wherein the sack is provided with a strip along the top edge, wherein the strip comprises a first layer of added material attached to at least one of the walls, a second layer of added material attached to the first layer, and an ink layer on the second layer, wherein at least the ink of the ink layer has been partially removed to create a label on the strip of the sack.

Description

Labelled sack

BACKGROUND

The invention relates to a sack, in particular a sack which is intended to be filled with bulk goods, such as onions, potatoes or their seedlings.

Such sacks are usually made of a woven material having an open structure to allow air passing in and out the sack. The type of product contained by the sack requires that details thereof, such as the production date, filling date, client identifying numbers, production location, batch number, class, size and quantity, are added to the sack.

It is customary to either sew a preprinted dedicated ribbon onto the sack when the filling opening is closed, or to manually add separate labels that identify the content of the sacks. Both methods require that for each batch of products a supply of labels needs to be prepared. Sewing dedicated ribbons onto the sacks furthermore requires the exchange of the ribbons and reconfiguration of the production line between batches which is time consuming. Adding labels to the sacks by hand is labor intensive and prone to human error.

It is an object of the invention to provide a sack which is used in a filling and packaging line for bulk goods to reduce time and costs.

It is another object of the invention to provide a sack which is used in a filling and packaging line for bulk goods to increase flexibility and to provide a higher accuracy and efficiency.

SUMMARY OF THE INVENTION

The invention provides a sack intended to be filled with bulk goods, such as potatoes and onions, comprising a first woven wall and a second woven wall, which walls at a top edge of the sack leave a filling opening open and which have been attached to each other or merge into each other along two longitudinal edges and a bottom edge of the sack, wherein the walls have been formed with weft threads and warp threads extending transverse thereto while keeping a distance between the adjacently extending weft threads and adjacently extending warp threads in order to keep airing openings open in between them, wherein the sack is provided with a strip along the top edge, wherein the strip comprises a first layer of added material attached to at least one of the walls, a second layer of added material attached to the first layer, and an ink layer on the second layer, wherein at least the ink of the ink layer has been partially removed to create label on the strip of the sack.

The sack according to the invention allows for the possibility to provide the required details of the bulk good contained by the sack to be labelled onto the label on the sack by removing a specific part of the ink of the ink layer, for example by means of a laser. When another batch of bulk good to be filled into the sack is processed, the required details of the respective bulk good can be entered or selected in a control system of the laser. Subsequently, the control system controls the laser to remove a specific part of the ink of the ink layer corresponding to the required details. These printing instructions can be entered and, optionally, saved directly into the control system by an operator or via an online connection with a back office. Once saved, these instructions can be readily accessed for future use. A packaging station using these sacks can thus almost instantly change between batches of products, therewith reducing the time needed for adjusting, exchanging or providing the labels for the sacks to a minimum. An advantage thereof is that the accuracy and efficiency of the packaging station is increased, while adjusting the labels to the bulk good is more flexible.

Thus, a label on the strip of the sack with the afore mentioned required details can be provided by partially removing the ink of the ink layer and the sack can therefore be used for each new and separate batch of bulk goods. It is therefore no longer necessary to prepare a supply of labels, to sew the dedicated ribbons or labels onto the sack, or to add labels into the sack by hand. Since the sack can be used for each batch of bulk good, the sack according to the invention reduces time and costs during use in a filling and packaging line for bulk goods.

Further, the known labels and ribbons are printed in a conventional manner. Bulk goods, such as potatoes and onions, are usually handled in dusty environments, such that the conventional manner of providing, such as printing, the required details onto the labels and ribbons is fault-sensitive since printing errors may occur due to the dust or through clogging of print nozzles. The sack according to the invention has an advantage in that partially removing the ink of the ink layer in order to create the label is virtually error proof. Even when there is dust on the strip of the sack, it is still possible to partially remove the ink of the ink layer.

It is noted that in the context of the present application, the term 'thread'’ can be replaced by or has to be understood to have the same meaning as one of the terms "tape" or "yarn".

In an embodiment the first layer is made of polyethylene or polypropylene forming a film. In a further embodiment the first layer is made of a non-polar polypropylene copolymer. Polypropylene is a flexible and tough material, and is further reasonably economical. Additionally, polypropylene has a good fatigue resistance. For example during transport of the filled sack, the sack clashes with or abutting against other sacks or with other environmental elements, due to which external forces will be applied to inter alia the strip of the sack. These external forces lead to partial deformation or flexing of the strip. Polypropylene is able to withstand such partial deformation or flexing, such that the label remains readable and/or the integrity thereof is maintained.

Additionally, parts made from polypropylene can be recycled multiple times before incineration is necessary. When it is necessary to incinerate the polypropylene parts, it is possible to recover more energy from polypropylene during incineration than from any other comparable plastic.

In an embodiment the first layer contains a color agent. In a further embodiment the ink layer is of a color that contrasts with the color of the first layer. The first layer is visible through the openings in the ink layer, which are provided by partially removing the ink from the ink layer. The contrasting colors of the ink layer and the first layer, contribute to the readability and, optionally, the scan-ability of the label and thus also to the details provided to the label by the removal of a part of the ink from the ink layer.

In an embodiment the second layer is made of biaxially oriented polypropylene (BOPP) forming a film. Ink is applied to the BOPP film which is then laminated to the first layer of the strip of the sack. Due to the intrinsic nature of BOPP this is an excellent medium on which various client-specific colors can be applied. Prior to the production of the sacks the ink colors can be pre-applied to rolls of BOPP. The rolls of BOPP with the applied ink(s) can subsequently be held on stock prior to application to the first layer, which leads to increased production flexibility and speed. Further, if the first layer of the strip is made of polypropylene, BOPP forms a secure and tamper proof label, when applied to the (molten) polypropylene of the first layer. This can lead to reduction in fraud.

Additionally, BOPP also allows for the possibility of and flexibility in future printing developments and variations which can lead to additional client specific printing designs. The used laser requires additional power and illumination duration to penetrate the BOPP layer, therefore the BOPP layer in itself forms a barrier, protecting the first layer from laser penetration.

In an embodiment the second layer is transparent. Due to the second layer being transparent, it is possible to see the first layer of the strip through the openings in the ink layer which are created by removing a part of the ink from the ink layer. In particular, when the first layer has a color contrasting with the color of the ink of the ink layer, the second layer being transparent contributes to the readability and, optionally, scan-ability of the label on the strip.

In an embodiment the strip comprise a metal or metalized layer between the second layer and the ink layer. In a further embodiment the metal or metalized layer is an aluminum layer. The metal or metalized layer is visible through the marks etched through the ink layer by the strategic removal of the ink from the ink layer. The metal or metalized layer has a color, such as the color of aluminum, which color is intended to be contrasting with the color of the ink layer. Hence, the metal or metalized layer in and of itself provides the contrasting color, therewith contributing to the visibility through the removed parts of the ink from the ink layer and thus to the readability of the label.

In an alternative embodiment the second layer is metalized, preferably by aluminum.

In an embodiment the ink layer is formed by a first ink layer with a first color and a second ink layer with a second color that contrasts with the first color. The first ink layer is provided between the second layer and the second ink layer. It is possible to remove only a part of the second ink layer, such that the underlying part of the first ink layer remains intact. The contrasting colors of the first ink layer and the second ink layer provide good readability of the label on the strip.

Furthermore, it is possible to remove parts of solely the second ink layer and to remove corresponding parts of the first ink layer and the second ink layer. The label created on the strip of the sack can, therefore, be provided with different colors, namely the color of the first ink layer and the color of the first layer or the second layer in combination with the color of the second ink layer. Due to the different colors, it is possible to emphasize determined parts of the label.

In an embodiment both the ink of the inklayer, and the second layer have been partially removed synchronously to create the label on the strip of the sack.

In an embodiment the walls have been formed with weft threads and pairs of warp threads extending transverse thereto, wherein the pairs of warp threads successively alternately pass over the weft threads and under the weft threads and twist with respect to one another between consecutive weft threads while keeping a distance between the adjacently extending weft threads and pairs of warp threads in order to keep the airing openings open in between them. An advantage of this embodiment is that the airing openings are kept open by the pairs of twisted warp threads, such that the bulk good, such as potatoes or onions, remains in touch with the external atmosphere encountered during the various stages of packaging and transportation. Fresh air being able to enter the sack through the airing openings can contributes up to a certain point to maintaining the quality or freshness of the bulk good contained in the sack.

In an embodiment the walls have been formed with weft threads and warp threads extending transverse thereto, wherein the warp threads successively alternately pass over the weft threads and under the weft threads while keeping a distance between the adjacently extending weft threads and warp threads in order to keep the airing openings open in between them.

In an embodiment the weft threads and warp threads are polypropylene threads. Polypropylene is a flexible and tough material, and additionally is reasonably economical. By using polypropylene threads, the sack is expected to have a long lifetime, since it is able to withstand forces applied to the sack during the lifetime thereof. The sack formed by polypropylene weft threads and polypropylene warp threads is thus a durable sack.

In an embodiment the weft threads and warp threads are jute threads. An advantage of a sack with walls formed with jute warp threads and jute weft threads, is that the sack is biodegradable or, optionally can be incinerated while realizing a relative high caloric energy for example due to the BOPP layer and the polypropylene.

In an embodiment the weft threads and warp threads are cotton threads.

In an embodiment the strip is corrugated, having its tops straight above the weft threads and/or warp threads. By providing the tops of the corrugations straight above the weft threads and the warp threads, the dales of the corrugations can be provided between the weft threads and the warp threads. The strip and the weft threads and the warp threads thus form an intertwined structure. Due to the intertwined structure, the strip, weft threads and warp threads are brought into engagement with each other and it is therefore virtually impossible to remove the strip from the sack without leaving evidence of tampering.

In an embodiment the woven walls have a reinforcement along the top edge that is fully covered by the strip. In a further embodiment the strip has a width that is at least twice the width of the reinforcement. In practice, the top edge of the sack is the location where the sack is suspended during filling thereof, or is gripped during processing or transporting of the sack. By providing the reinforcement along the top edge, the sack is able to withstand forces applied thereto during suspending and/or gripping and the sack is prevented from rupturing. Furthermore, by covering the reinforcement by the strip, the reinforcement is withdrawn from sight and the sack has a uniform appearance

In an embodiment the reinforcement comprises a multiple of, in particular double, the amount of weft threads or warp threads with respect to the remainder of the woven wall. Providing the reinforcement by means of doubling the amount of weft threads or warp threads is a relatively simple manner of manufacturing the sack with the reinforcement along the top edge, since the sack and the reinforcement are produced in the same and single production process.

In an embodiment the sack comprises a pair of suspension openings through the strip and the woven walls. Due to the suspension openings, several empty sacks can be slid over parallel straight suspension pins. The sacks then hang down parallel against each other in order to form a supply that can be (mechanically) pulled off from the suspension pins.

In an embodiment the suspension openings are located aside and adjacent to the reinforcement. It is conceivable that during filling of the sack with bulk good, forces will be applied to the edge of the suspension openings due to bulk good being dropped into the sack. By providing the suspension openings aside and adjacent to the reinforcement, the forces will be divided over the two suspension openings while the edge of the sack is prevented from rupturing.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention will be elucidated on the basis of a exemplary embodiments shown in the attached drawings, in which:

Figures 1A and IB show an isometric view and a side view of a sack with a laser printed strip according to a first embodiment of the invention;

Figures 2A-2C show details of the fabric and strip of the sack according to figures 1A and IB;

Figure 3 shows a method for manufacturing the sack with its strip; and

Figures 4A and 4B show a method for applying labels to the strip of the sack.

DETAILED DESCRIPTION OF THE INVENTION

Figures 1A and IB show a first embodiment of a sack 1 which is intended to be filled with bulk goods, such as onions, potatoes or their seedlings. The sack 1 comprises a front wall 2 and a rear wall 3 which in the empty condition of the sack 1 define a rectangular outer contour. The sack 1 then has a straight left longitudinal edge 5, a straight right longitudinal edge 6, a straight bottom edge 7 and a straight top edge 8.

The walls 2, 3 of the sack 1 are made of a fabric 20 that is described hereafter in detail under reference to Figure 2A. In this example at the left longitudinal edge 5 the fabric 20 of the sack 1 merges from the one side to the other due to folding down, and has been attached to each other along the bottom edge 7 and the right longitudinal edge 6 by means of a stitching 10, or by means of heat sealing, tacking or gluing. The top edge 8 of the fabric 20 defines a filling opening 12 of the sack 1.

The fabric 20 as shown in detail in figure 2A contains weft yarn or weft threads 30 which in this example extend over the full length A of the sack 1 and pairs of twisted warp yarns or warp threads 31, 32. The warp threads 31, 32 opposite each other consecutively pass over the weft threads 30 and under the weft threads 30 and twist with respect to one another between the consecutive weft threads 30. The weft threads 30 extend adjacent to each other and have a specific distance dl between them, and the pairs of warp threads 31, 32 extend adjacent to each other and have a specific distance d2 between them. As a result, airing openings 33 having a rectangular contour are kept open within the fabric 20. Their width and length are at least twice, preferably at least three times as large as the average thickness of the weft threads 30 and warp threads 31, 32. The threads 30, 31, 32 are made of polypropylene or predominantly polypropylene.

The sack 1 has along the top edge 8 a reinforced area 21 forming a band in its fabric 20. Within this reinforced area 21 the distance d3 between adjacent pairs of warp threads 31, 32 is substantially smaller than the distance d2 between adjacent pairs of warp threads 31, 32 in the main area of the fabric 20.

The sack 1 has along the top edge 8 a band or strip 40 of added material layers is arranged on the exterior of the front wall 2 and the rear wall 3. The strip 40 covers the reinforced area 21 and an adjacent zone of the main area of the fabric 20.

As best shown in figure 2B the strip 40 comprises a first layer 41 which is made of a synthetic material, in particular a polyolefin, such as polypropylene (PP) or Polyethylene (PE) . In this example the first layer 41 is a (non-polar) polypropylene lamination copolymer having a thickness of less than 50 pm, preferably about 30 pm. The first layer 41 has a color agent added to it, in this example the first layer 41 is white. The first layer 41 has been attached to the fabric 20 or has been formed in a laminating or coating process. The first layer 41 may be attached to the fabric 20 while being a viscous, soft, plastic, after which the first layer 41 cools rapidly. A contact area of the abutting surface of the first layer 41 will thus be fused and adhered to the weft threads 30 and warp threads 31, 32.

The strip 40 is provided with a second layer 42 which is made of a synthetic material, in particular a polyolefin, such as polypropylene. In this example the second layer 42 is made of biaxially oriented polypropylene (BOPP). The second layer 42 is in this example transparent. The second layer 42 has a thickness of less than 50 pm, preferably about 20 pm. To the second layer 42 a paint layer or ink layer 43 is applied. This ink layer 43 is shown schematically as a separate layer in figure 2B but is in fact already applied to the second layer 42. The color of the ink layer 43 contrasts with the color of the first layer 41. In this example the ink layer 43 is dark blue. The second layer 42 has been attached to the first layer 41 or has been formed in a laminating or coating process. The abutting surface will thus be fused and adhered to the surface of the first layer 41. As best shown in figure 2C the strip 40 has a corrugated surface. This is due to the discontinuous, corrugated structure of the fabric 20 of the sack 1. The underlying weft threads 30 and warp threads 31, 32 cause bulges in the surface of the strip 40.

The strip 40 encompasses a label section 44 which, after laser printing details about the bulk good to be filled into the sack 1, will contain information about the sack and/or content thereof. The label section 44 on the strip 40 may cover the reinforced area 21 and/or the adjacent zone of the main area of the fabric 20. The label section 44 has the same corrugated surface as the strip 1.

The label section 44 has been formed by removing, by laser, marks from the second layer 42, including parts of the ink layer 43. The underlying first layer 41 has not been affected by the laser. Since the color of the first layer 41 is contrasting to the color of the ink layer 43 the label section 44 is clearly readable. The ink layer 43 can be removed with for example a carbon dioxide laser with an output power within the range of 30-60 W.

The sack 1 is provided with two pairs of suspension openings 45 that both at the front wall 2 and the rear wall 3 extend through the strip 40 and the fabric 20. The pairs of suspension openings 45 are in the middle of the strips 40 directly below the reinforced area 21 and have been aligned with each other. As a result, several empty sacks 1 can be slid over parallel straight suspension pins that have not been shown. The sacks 1 then hang down parallel against each other in order to form a supply that can be mechanically pulled off from the suspension pins. Taking them off takes place by means of suction cups that engage onto the air-impermeable strip 40 and then move away from the supply parallel to the suspension pins. In that case each time the front sack 1 will be opened at the filling opening 12 and subsequently be taken from the supply.

Figure 3 schematically shows a manufacturing process for the sack 1. It shows a weaving machine 100 with which a continuous web 101 of the fabric 20 is formed. The continuous web 101 leaves the weaving machine 100 in direction D, wherein the continuous reinforced area 21 has been provided extending in longitudinal direction or discharge direction D. After leaving the weaving machine 100 the first layer 41 of the strip 40 is applied in direction E along one side edge by means of a schematically indicated first lamination or coating device, where after the first layer 41 is pressed onto the continuous web 101 by means of a schematically shown pressure roll. It is noted that for applying the first layer 41 onto the continuous web 101, for example a mixture of polypropylene with the added color agent, in a molten state, is supplied to a non-shown die, for example a funnel. Subsequently, the mixture is applied onto the continuous web 101 in the molten state, such that first layer 41 gets fused and adhered to the weft threads and warp threads of the continuous web 101. Applying the mixture occurs at a temperature between about 180°C - 200°C.

Subsequently the second layer 42, with the ink layer 43 applied on it, is fed against the first layer 41 in direction H by means of a schematically indicated second lamination or coating device, where after the second layer 42 is pressed onto the first layer 41 by means of a schematically shown pressure roll. It is noted that, after equaling the tension of the fabric and the tension of the second layer, the second layer 42 is married to the first layer 41, while the first layer 41 is still in its viscous soft, molten state. Subsequently both layers are press rolled so that the first layer 41 is fused to both the underlying fabric of the sack 1 as well as fused to the second layer 42, after which the first and second layer cool down rapidly, forming a fused bond between the first layer 41 and the second layer 42.

Each time an end part 102 of the continuous web 101 is folded down backwards in direction F towards the continuous web 101 and a same consecutive part 103 is separated from the continuous web 101 in direction G. The folded edge then forms the left longitudinal edge 5 of the sack 1, the end part 102 forms the rear wall 3 and the consecutive part 103 onto which the end part is folded down forms the front wall 2. They are subsequently provided with the stitching 10 along the bottom edge 7 and the right longitudinal edge 6. Finally, the pairs of suspension openings 45 are formed by not shown means of punching or perforation.

Figures 4A and 4B schematically show an example of a process for labeling the sack 1 by a labelling arrangement 200 which is disposed along a transportation line T for sacks 1. The transportation line T may be part of a filling and packaging line for bulk goods. The strip 40 of the sack 1 is fed in direction K along the transportation line T into the labeling arrangement 200. The area of the strip 40 which is to be labeled is positioned in front of a frame 201 and a linear actuator 202 moves a backing plate 203 with the strip 40 in direction L. The backing plate 203 pushes the corrugated strip 40 flush against the frame 201 providing a substantially flat surface of the strip 40 within the frame 201, whereby the strip 40 is immobilized during labelling. Subsequently a light source or laser source 204 forms a label by removing the ink and creating marks forming the label section 44 from the second layer 42 within the frame 201. When the label is written or printed, the backing plate 203 is retracted by the linear actuator 202 and the strip 40 is released from the labelling arrangement 200 and transported further along the transportation line T in direction K. The process of removing the ink and creating the readable marks with the laser takes, depending on the size and amount of the text/marks, between 0.5 and 3.2 seconds .

In an alternative second embodiment of the sack 1, the first layer 41 is made of a synthetic material, in particular a polyolefin, such as polypropylene (PP) . In this example the first layer 41 is a (non-polar) polypropylene lamination copolymer having a thickness of less than 50 pm, preferably about 30 pm. The first layer 41 has no color agent added to it. In the second embodiment, the second layer 42 is made of a metallized synthetic material, in particular a polyolefin, such as polypropylene. In this example the second layer 42 is made of biaxially oriented polypropylene (BOPP) on which a layer of aluminum has been vaporized. The second layer 42 has a thickness of less than 50 pm, preferably about 20 pm, wherein the layer of aluminum has a thickness of 40-60 nm. To the layer of aluminum two layers of solvent based, nonpolar polyamide-ink has been applied in contrasting colors.

In an alternative third embodiment of the sack 1, the first layer 41 is made of a synthetic material, in particular a polyolefin, such as polypropylene (PP) . In this example the first layer 41 is a (non-polar) polypropylene lamination copolymer having a thickness of less than 50 pm, preferably about 30 pm. The first layer 41 has no color agent added to it. In the third embodiment, the second layer 42 is made of a metallized synthetic material, in particular a polyolefin, such as polypropylene. In this example the second layer 42 is made of biaxially oriented polypropylene (BOPP) on which a layer of aluminum has been vaporized. The second layer 42 has a thickness of less than 50 pm, preferably about 20 pm, wherein the layer of aluminum has a thickness of 40-60 nm. To the layer of aluminum a layer of solvent based, nonpolar polyamide-ink has been applied in contrasting color with respect to the aluminum layer.

In abovementioned embodiments, the fabric 20 comprises polypropylene threads 30, 31, 32. Alternatively, the fabric 20 is a woven jute fabric or woven cotton.

It is to be understood that the above description is included to illustrate the operation of the preferred embodiments and is not meant to limit the scope of the invention. From the above discussion, many variations will be apparent to one skilled in the art that would yet be encompassed by the scope of the present invention.

Claims

1. Zak bestemd om gevuld te worden met stortgoederen, zoals aardappelen en uien, omvattend een eerste gewoven wand en een tweede gewoven wand, welke wanden aan een bovenrand van de zak een vulopening vrijlaten en langs twee langsranden en een bodemrand van de zak aan elkaar bevestigd zijn danwel in elkaar overgaan, waarbij de wanden zijn gevormd met kettingdraden en zich dwars daarop uitstrekkende inslagdraden met behoud van een afstand tussen de zich naast elkaar uitstrekkende kettingdraden en de zich naast elkaar inslagdraden om daartussen luchtopeningen vrij te houden, waarbij de zak langs de bovenrand is voorzien van een strip, waarbij de strip is voorzien van een eerste laag toegevoegd materiaal die aan ten minste één van de wanden is bevestigd, een tweede laag van toegevoegd materiaal die is bevestigd op de eerste laag, en een inktlaag op de tweede laag, waarbij ten minste de inkt van de inktlaag ten minste gedeeltelijk is verwijderd om op de strip een label te vormen.A bag intended to be filled with bulk goods, such as potatoes and onions, comprising a first woven wall and a second woven wall, which walls leave a filling opening at an upper edge of the bag and together along two longitudinal edges and a bottom edge of the bag are fixed or merge with one another, the walls being formed with warp threads and weft threads extending transversely thereto while maintaining a distance between the warp threads extending next to each other and the weft threads next to each other to keep air openings free between them, the bag along the upper edge is provided with a strip, wherein the strip is provided with a first layer of added material attached to at least one of the walls, a second layer of added material attached to the first layer, and an ink layer to the second layer wherein at least the ink is at least partially removed from the ink layer to form a label on the strip.

2. Zak volgens conclusie 1, waarbij de eerste laag is vervaardigd van polyethyleen of polypropyleen dat een film vormt.The bag of claim 1, wherein the first layer is made of polyethylene or polypropylene that forms a film.

3. Zak volgens conclusie 2, waarbij de eerste laag is vervaardigd van een niet-polair polypropyleen copolymeer.The bag of claim 2, wherein the first layer is made of a non-polar polypropylene copolymer.

4. Zak volgens een der voorgaande conclusies, waarbij de eerste laag een kleurstof omvat.A bag according to any one of the preceding claims, wherein the first layer comprises a colorant.

5. Zak volgens conclusie 4, waarbij de inktlaag een kleur bezit die contrasteert met de kleur van de eerste laag.The bag of claim 4, wherein the ink layer has a color that contrasts with the color of the first layer.

6. Zak volgens een der voorgaande conclusies, waarbij de tweede laag is vervaardigd van biaxiaal georiënteerd polypropyleen (BOPP) dat een film vormt.A bag according to any one of the preceding claims, wherein the second layer is made from biaxially oriented polypropylene (BOPP) that forms a film.

7. Zak volgens conclusie 6, waarbij de tweede laag transparant is.The bag of claim 6, wherein the second layer is transparent.

8. Zak volgens een der voorgaande conclusies, waarbij de strip een metalen of gemetalliseerde laag omvat tussen de tweede laag en de inktlaag.A bag according to any one of the preceding claims, wherein the strip comprises a metal or metallized layer between the second layer and the ink layer.

9. Zak volgens conclusie 8, waarbij de metalen of gemetalliseerde laag een aluminium laag is.The bag of claim 8, wherein the metal or metallized layer is an aluminum layer.

10. Zak volgens een der conclusies 1-6, waarbij de tweede laag is gemetalliseerd, bij voorkeur door aluminium.A bag according to any one of claims 1-6, wherein the second layer is metallized, preferably by aluminum.

11. Zak volgens een der voorgaande conclusies, waarbij de inktlaag is gevormd door een eerste inktlaag met een eerste kleur en een tweede inktlaag met een tweede kleur die contrasteert met de eerste kleur.A bag according to any one of the preceding claims, wherein the ink layer is formed by a first ink layer with a first color and a second ink layer with a second color that contrasts with the first color.

12. Zak volgens een der voorgaande conclusies, waarbij zowel de inkt van de inktlaag, als de tweede laag op synchrone wijze ten minste gedeeltelijk zijn verwijderd om op de strip van de zak het label te vormen.A bag according to any one of the preceding claims, wherein both the ink from the ink layer and the second layer are at least partially removed synchronously to form the label on the strip of the bag.

13. Zak volgens een der voorgaande conclusies, waarbij de wanden zijn gevormd met kettingdraden en zich dwars daarop uitstrekkende paren inslagdraden, waarbij de paren inslagdraden opeenvolgend om en om over de kettingdraden heen en onder de kettingdraden door gaan en tussen de opeenvolgende kettingdraden ten opzichte van elkaar gedraaid zijn met behoud van een afstand tussen de zich naast elkaar uitstrekkende kettingdraden en paren inslagdraden om daartussen luchtopeningen vrij te houden.A bag according to any one of the preceding claims, wherein the walls are formed with warp threads and pairs of weft threads extending transversely thereto, the pairs of weft threads successively passing over and around the warp threads and between the warp threads and between the successive warp threads relative to are twisted together while maintaining a distance between adjacent warp threads and pairs of weft threads to keep air openings free between them.

14. Zak volgens een der conclusies 1-12, waarbij de wanden zijn gevormd met kettingfdraden en zich dwars daarop uitstrekkende inslagdraden, waarbij de inslagdraden opeenvolgend om en om over de kettingdraden heen en onder de kettingdraden door gaan met behoud van een afstand tussen de zich naast elkaar uitstrekkende kettingdraden en inslagdraden om daartussen luchtopeningen vrij te houden.14. Bag as claimed in any of the claims 1-12, wherein the walls are formed with warp threads and weft threads extending transversely thereto, the weft threads successively passing over and around the warp threads and under the warp threads while maintaining a distance between the side-by-side warp threads and weft threads to keep air openings free between them.

15. Zak volgens een der voorgaande conclusies, waarbij de kettingdraden en inslagdraden polypropyleendraden zijn.A bag according to any one of the preceding claims, wherein the warp threads and weft threads are polypropylene threads.

16. Zak volgens een der conclusies 1-14, waarbij de kettingdraden en inslagdraden jute draden zijn.A bag according to any one of claims 1-14, wherein the warp threads and weft threads are jute threads.

17. Zak volgens een der conclusie 1-14, waarbij de kettingdraden en inslagdraden katoenen draden zijn.A bag according to any one of claims 1-14, wherein the warp threads and weft threads are cotton threads.

18. Zak volgens een der voorgaande conclusies, waarbij de strip gegolfd is, met zijn toppen recht boven de kettingdraden en/of inslagdraden.A bag according to any one of the preceding claims, wherein the strip is corrugated, with its tips straight above the warp threads and / or weft threads.

19. Zak volgens een der voorgaande conclusies, waarbij de gewoven wanden langs de bovenrand een versterking bezitten die volledig is bedekt door de strip.A bag according to any one of the preceding claims, wherein the woven walls along the top edge have a reinforcement completely covered by the strip.

20. Zak volgens conclusie 19, waarbij de strip een breedte bezit die ten minste twee maal de breedte van de versterking bedraagt.The bag of claim 19, wherein the strip has a width that is at least twice the width of the reinforcement.

21. Zak volgens conclusie 19 of 20, waarbij de versterking ten opzichte van de rest van de gewoven wand een veelvoud, in het bijzonder het tweevoud van het aantal kettingdraden of inslagdraden omvat.A bag according to claim 19 or 20, wherein the reinforcement with respect to the rest of the woven wall comprises a multiple, in particular twice the number of warp threads or weft threads.

22. Zak volgens een der voorgaande conclusies, omvattend een paar ophangopeningen door de strip en de gewoven wanden.A bag according to any one of the preceding claims, comprising a pair of suspension openings through the strip and the woven walls.

23. Zak volgens conclusies 19 en 22, waarbij de ophangopeningen naast en grenzend aan de versterking zijn gelegen.A bag according to claims 19 and 22, wherein the suspension openings are located adjacent to and adjacent to the reinforcement.