EP3643634B1 - Papier, sac à pain et methode pour sa fabrication - Google Patents
Papier, sac à pain et methode pour sa fabrication Download PDFInfo
- Publication number
- EP3643634B1 EP3643634B1 EP19201224.3A EP19201224A EP3643634B1 EP 3643634 B1 EP3643634 B1 EP 3643634B1 EP 19201224 A EP19201224 A EP 19201224A EP 3643634 B1 EP3643634 B1 EP 3643634B1
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- EP
- European Patent Office
- Prior art keywords
- layer
- paper
- cellulose
- coating layer
- paper according
- Prior art date
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Links
- 235000008429 bread Nutrition 0.000 title claims description 47
- 238000000034 method Methods 0.000 title description 9
- 238000004519 manufacturing process Methods 0.000 title description 7
- 239000010410 layer Substances 0.000 claims description 163
- 239000001913 cellulose Substances 0.000 claims description 69
- 229920002678 cellulose Polymers 0.000 claims description 69
- 239000011247 coating layer Substances 0.000 claims description 66
- 230000000873 masking effect Effects 0.000 claims description 63
- 239000000463 material Substances 0.000 claims description 18
- 230000003252 repetitive effect Effects 0.000 claims description 12
- 239000011230 binding agent Substances 0.000 claims description 11
- 230000035699 permeability Effects 0.000 claims description 11
- 239000000203 mixture Substances 0.000 claims description 9
- 235000015112 vegetable and seed oil Nutrition 0.000 claims description 9
- 239000008158 vegetable oil Substances 0.000 claims description 9
- 239000000835 fiber Substances 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 235000013399 edible fruits Nutrition 0.000 claims description 6
- 238000004806 packaging method and process Methods 0.000 claims description 6
- 235000013311 vegetables Nutrition 0.000 claims description 6
- 235000013351 cheese Nutrition 0.000 claims description 5
- 235000013372 meat Nutrition 0.000 claims description 5
- 230000004888 barrier function Effects 0.000 claims description 2
- 239000001023 inorganic pigment Substances 0.000 claims description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 16
- 239000003921 oil Substances 0.000 description 11
- 235000019198 oils Nutrition 0.000 description 11
- 229910000019 calcium carbonate Inorganic materials 0.000 description 8
- 239000012466 permeate Substances 0.000 description 7
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 239000002480 mineral oil Substances 0.000 description 4
- 235000010446 mineral oil Nutrition 0.000 description 4
- 239000000049 pigment Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 3
- 238000003490 calendering Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000945 filler Substances 0.000 description 3
- 230000035515 penetration Effects 0.000 description 3
- 238000007639 printing Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 230000003746 surface roughness Effects 0.000 description 3
- 239000001993 wax Substances 0.000 description 3
- 235000019482 Palm oil Nutrition 0.000 description 2
- 239000004952 Polyamide Substances 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 2
- 229920001577 copolymer Polymers 0.000 description 2
- 235000014113 dietary fatty acids Nutrition 0.000 description 2
- 150000002148 esters Chemical class 0.000 description 2
- 239000000194 fatty acid Substances 0.000 description 2
- 229930195729 fatty acid Natural products 0.000 description 2
- 150000004665 fatty acids Chemical class 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 238000007647 flexography Methods 0.000 description 2
- 239000002540 palm oil Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 229920002647 polyamide Polymers 0.000 description 2
- 229920002689 polyvinyl acetate Polymers 0.000 description 2
- 239000011118 polyvinyl acetate Substances 0.000 description 2
- 239000003549 soybean oil Substances 0.000 description 2
- 235000012424 soybean oil Nutrition 0.000 description 2
- 239000002966 varnish Substances 0.000 description 2
- 235000019489 Almond oil Nutrition 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- 239000005662 Paraffin oil Substances 0.000 description 1
- 235000019486 Sunflower oil Nutrition 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000008168 almond oil Substances 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000007900 aqueous suspension Substances 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000000828 canola oil Substances 0.000 description 1
- 235000019519 canola oil Nutrition 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 235000005687 corn oil Nutrition 0.000 description 1
- 239000002285 corn oil Substances 0.000 description 1
- 238000002845 discoloration Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000002657 fibrous material Substances 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 235000013312 flour Nutrition 0.000 description 1
- 125000005456 glyceride group Chemical group 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 230000003760 hair shine Effects 0.000 description 1
- 239000011121 hardwood Substances 0.000 description 1
- 229920005610 lignin Polymers 0.000 description 1
- 239000000944 linseed oil Substances 0.000 description 1
- 235000021388 linseed oil Nutrition 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000004006 olive oil Substances 0.000 description 1
- 235000008390 olive oil Nutrition 0.000 description 1
- 239000005022 packaging material Substances 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 229920000058 polyacrylate Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 230000001846 repelling effect Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000011122 softwood Substances 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- -1 spreads out too much Substances 0.000 description 1
- 239000002600 sunflower oil Substances 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D31/00—Bags or like containers made of paper and having structural provision for thickness of contents
- B65D31/02—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
- B65D31/00—Bags or like containers made of paper and having structural provision for thickness of contents
- B65D31/10—Bags or like containers made of paper and having structural provision for thickness of contents with gusseted sides
-
- 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
- B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
- B65D65/38—Packaging materials of special type or form
- B65D65/42—Applications of coated or impregnated materials
-
- 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
- B65D85/00—Containers, packaging elements or packages, specially adapted for particular articles or materials
- B65D85/30—Containers, packaging elements or packages, specially adapted for particular articles or materials for articles particularly sensitive to damage by shock or pressure
- B65D85/36—Containers, packaging elements or packages, specially adapted for particular articles or materials for articles particularly sensitive to damage by shock or pressure for bakery products, e.g. biscuits
Definitions
- the invention relates to paper of combined layers comprising a cellulose layer and a coating layer for setting the moisture permeability, wherein the coating layer is situated on a first side of the cellulose layer.
- the invention likewise relates to a bread bag on the basis of said paper.
- the invention further relates to a method for manufacturing a bread bag, comprising the steps of:
- Such a bread bag is known from BE 1022151 .
- This relates to a bread bag of paper which has been treated and thereby consists of combined layers.
- the known bread bag is provided with a coating layer of vegetable oil, such as a modified vegetable oil. With this green coating layer the bread bag meets the requirements of recyclability and can meet the requirements of compostability.
- the coating is particularly applied on the outer side. When an imprint is desired, it is arranged under the coating.
- Another example for a bag is known from FR3008392 .
- paper is for this purpose provided which is suitable for manufacturing bread bags, which paper comprises different layers, including a cellulose layer and a coating layer, such as for setting the moisture permeability, wherein the coating layer is situated on a first side of the cellulose layer and a masking layer is present on a second side of the cellulose layer, which masking layer is provided with a predetermined pattern and comprises a binder material which impregnates the cellulose layer, and wherein the masking layer has penetrated through the cellulose layer to the first side, wherein the cellulose layer has a specific weight of at most 60 g/m 2 and a Gurley (ISO5636-5) air resistance of at most 100 seconds.
- a coating layer such as for setting the moisture permeability
- a bread bag of combined layers which comprises a cellulose layer and a coating layer for setting the moisture permeability, wherein the coating layer is situated on a first side of the cellulose layer.
- the coating layer is here situated on an inner side of the bread bag and the cellulose layer has a specific weight of at most 60 g/m 2 and a Gurley (ISO5636-5) air resistance of at most 100 seconds.
- a masking layer is moreover present on a second side of the cellulose layer, which masking layer is provided with a predetermined pattern and comprises a binder material which impregnates the cellulose layer locally, and wherein the masking layer has penetrated through the cellulose layer to the first side.
- a method for manufacturing a bread bag comprising the steps of: (1) providing a cellulose layer with a first side and a second side, wherein the cellulose layer has a specific weight of at most 60 g/m 2 and a Gurley (ISO5636-5) air resistance of at most 100 seconds; (2) applying a masking layer to the second side in accordance with a predetermined pattern, this masking layer comprising a binder material which impregnates the cellulose layer and wherein the masking layer permeates the cellulose layer to the first side; (3) applying a coating layer to the first side of the cellulose layer; (4) forming bread bags from the combined layers.
- the paper according to the invention is used to package sliced meats and/or cheese and/or to package vegetables and/or fruit.
- a bread bag which is aesthetically attractive, has a desired moisture permeability and, at least in determined embodiments, is moreover recyclable and may also be compostable in accordance with set standards.
- the per se transparent or white masking layer appears to become opaque in combination with the coating layer. This effect is based on the fact that the masking layer obstructs the oily material of the coating layer and that the paper retains its original colour at the position of the masking layer.
- the partial penetration of the oily material of the coating layer into the cellulose layer has been found to produce an increase in the transparency of the paper in a uniformly distributed manner, and particular at positions where there is no masking layer.
- the masking layer here affects the coating layer, despite the two layers being arranged on opposite sides of the paper, when paper is used with a relatively low specific weight, which is comparatively porous.
- Particularly suitable are types of paper which are open or semi-open.
- the porosity of paper is measured with the Gurley air resistance.
- Semi-open paper has a (Gurley) air resistance of at most 100 seconds and open paper has an air resistance of at most 20 seconds.
- the air resistance according to the invention is preferably at most 60 seconds, and more preferably at most 40 seconds. More preferably, the paper is furthermore light, with a specific weight of at most 50 g/m 2 , still more preferably at most 40 g/m 2 .
- the masking layer which is applied as aqueous layer and which permeates the cellulose layer has a repelling effect on the previous non-polar coating layer. It can be of influence here that the coating layer, which is applied at a temperature higher than room temperature so as to ensure good spreading, cools more quickly because of the contact with the aqueous masking layer, whereby the viscosity increases more quickly than in the absence of the - aqueous - masking layer. It is noted here that the masking layer is applied in accordance with a predetermined pattern, which appears to enlarge the boundary surface between masking layer and coating layer.
- the masking layer comprises here a binder material which penetrates the paper.
- binder material chosen from the group of polyvinyl acetate, acrylate (co)polymers, polyamide, polyurethane, lignin resin and/or combinations thereof and copolymers therewith. It is an additional advantage of this type of binder material that it is dispersible or even (partially) soluble in water, so that the masking layer can be applied as an aqueous solution. At least one of a polyacrylate and a polyvinyl acetate is preferably present.
- the masking layer preferably also comprises a resin and/or a wax, for instance a wax on the basis of polyester, epoxy, polyamide, polysulfonic acid and the like.
- the amount of resin and wax is preferably at most 20% by weight on the basis of the dry substance content of the composition of the masking layer.
- the amount of binder material can be up to 90% by weight. In the case that a dye is present, this amount is generally smaller.
- the masking layer is more preferably arranged as a composition with 40-60% by weight water of the whole composition (so 80-120% by weight relative to the dry substance content, including optionally present dye or pigment). The water content is more preferably greater than the dry substance content.
- the coating layer preferably comprises a vegetable oil. This allows recycling of the paper. There is moreover no risk of mineral oil coming into contact with the bread or possible other foodstuff in the bag.
- vegetable oils are, among others, palm oil, soybean oil, sunflower oil, olive oil, almond oil, canola oil, linseed oil, corn oil.
- the oil is preferably applied as an ester of the fatty acid, for instance as a glyceride of the fatty acid, as is known to the skilled person.
- the coating layer is more preferably applied at an increased temperature, such as a temperature above 100°C. This results in a reduction of the viscosity of the vegetable oil. It is moreover suspected that at the increased temperature the oil also mixes at least partially with the masking layer or at least a top layer thereof. This is advantageous for the bonding. It is not precluded that this mixing further reduces the permeation of the oil toward the cellulose layer.
- the coating layer is preferably applied in an amount of more than 3 g/m 2 , such as 4-15 g/m 2 .
- the amount of coating layer is more preferably more than 6 g/m 2
- the amount of coating layer more preferably lies in the range of 4-8 g/m 2 . It has been found that the amount of coating layer can be limited owing to the combination of the masking layer and the coating layer. With an increase in the amount of binder material in the masking layer the amount of coating layer appears to decrease more strongly.
- a coating layer of for instance 9 g/m 2 provides for a lower moisture permeability than that of 7 g/m 2 . Without masking layer, a minimum in the moisture permeability is already reached at a lower amount.
- the masking layer comprises a dye.
- An advantageous dye is a dye on the basis of inorganic pigment, such as a white dye comprising for instance calcium carbonate particles and/or titanium dioxide. This has been found to be particularly advantageous for open paper. The dye particles are found to help in reducing penetration of the oily material of the coating layer through the paper, and thereby in reducing the necessary thickness of the coating layer in order to obtain a desired moisture permeability.
- the cellulose layer comprises a mixture of long fibre and short fibre, with at least 40% long fibres.
- Paper with a relatively large proportion of long fibres is highly suitable as packaging material for foodstuffs, such as bread, more preferably at least 50% or even at least 70%. It has been found that paper with a very high percentage of long fibres, such as 70% or even 80%, is very useful in obtaining thin and open or semi-open paper, i.e. for instance paper with a specific weight of less than 50 g/m 2 or even 40 g/m 2 and a Gurley air resistance of less than 50 seconds.
- 'short fibre' refers to cellulose originating from for instance hardwood or recycled paper and having a length in the order of 0.5-3 mm, more specifically 0.7-2.5 mm, and a diameter of for instance 20-30 ⁇ m.
- 'Long fibre' refers to cellulose primarily originating from softwood and more particularly having a length in the order of 2.5-5.0 mm, more specifically 2.7-4.5 mm, and a diameter of for instance 30-45 ⁇ m.
- the cellulose layer has a more closed structure on a first side than on an opposite second side.
- the masking layer is here applied to the more matt or open side, which in a bread bag is preferably situated on the outer side.
- the closed structure is for instance obtained in that the cellulose layer further comprises a sub-layer on the first side, which gives the paper a more closed structure on this side.
- the sub-layer comprises a filler material or a fibrous material in addition to cellulose.
- the sub-layer comprises calcium carbonate in addition to cellulose, resulting in a calcium carbonate layer.
- the more closed structure is obtained by processing the cellulose layer, for instance by subjecting it to additional calendering or providing it with a machine glazing. Combinations and/or further constituents are not precluded.
- a cellulose layer is applied which is open to the same extent on the first and the second side. This is for instance achieved by treating the cellulose layer on both sides so that a sub-layer results, for instance with machine glazing. This is also an advantageous option for thin paper, for instance with a specific weight of at most 50 g/m 2 , such as 35-50 g/m 2 .
- the surface of the paper has on the first side a surface roughness of at most 100 ml/min in accordance with ISO 8791-2 and on the second side a surface roughness of at least 100 ml/min in accordance with ISO 8791-2.
- the second side is hereby highly suitable for arranging an imprint, while the first side is suitable for application of the coating layer.
- the masking layer is preferably applied in a repetitive configuration. It has been found that the masking layer preferably covers 10-70% of the surface area of the cellulose layer.
- the pattern of the masking layer preferably comprises repetitive elements.
- the repetitive elements preferably have a zero-dimensional or one-dimensional form, such as dots, lines, circles. It is further possible for the repetitive elements to have other forms, such as zigzag lines, stepped forms, sine shapes, rectangles, squares, triangles.
- the repetitive elements more preferably have a fixed width.
- the repetitive elements are still more preferably situated at a uniform mutual distance, whereby a pattern of lines and intermediate spaces results.
- the perpendicular distance between the repetitive elements is more preferably at least 4 times greater than the width of the repetitive elements.
- the perpendicular distance is still more preferably a maximum of 3 times or even a maximum of 2 times the width of the repetitive elements.
- a watermark can also be arranged in this way. Although the watermark formally lies on the paper, it shines through the paper and appears to be located in the paper.
- the watermark can comprise an image or structure chosen as desired.
- the effective amount of pigment is relatively low (for instance up to 30% by weight on the basis of the dry substance content, preferably at most 10% or even without pigment), or the pigment is chosen with a fine particle size distribution (for instance 90% by weight smaller than 10 micron or even 80% by weight smaller than 5 micron).
- aqueous composition of the masking layer with a printing process.
- Use is particularly made here of a printing process wherein a pattern is transferred with one or more rolls. Examples thereof are rotogravure and flexography (abbreviated to flexo) printing.
- flexo rotogravure and flexography
- the masking layer thereby permeates even further into the cellulose layer. This achieves that the cellulose layer has a reduced porosity underneath the masking layer as well, and becomes substantially impermeable to the oily coating layer.
- an imprint is present on the second, preferably more open side of the cellulose layer, which is situated on an outer side of the bread bag. Arranging of the imprint on the outer side is commercially desirable and has been found to be effective, despite the fact that the second side is more open.
- the imprint is preferably arranged before the coating layer is applied.
- Paper comprising a cellulose layer and optionally further layers, such as a calcium carbonate layer, is generally used as a starting point.
- the paper can here be provided on the first side with a more closed structure than on the second side.
- the masking layer and, if applicable, the imprint are then applied to the paper. This is followed by the coating layer.
- This coating layer is preferably applied using a roller, as further elucidated in the application BE1022151 , at a temperature above 100°C.
- the masking layer is more preferably applied prior to an optional imprint.
- the paper with imprint, masking layer and coating layer is complete, it is processed into bread bags. If desired, a strip of plastic can be adhered to a strip of paper beforehand. This makes it possible to manufacture window bags.
- the process for manufacturing bread bags from paper is per se known. Bread bags are distinguished from other bags, such as bags for flour, by the shape of the bag and/or the properties of the paper.
- the paper of combined layers according to the invention including a masking layer and a coating layer is also suitable for other applications.
- An example is the use as packaging paper for vegetables and fruit, sliced meats and/or cheese, for instance in the form of sheets of paper.
- This invention can also serve for vegetable and fruit bags; the coating layer here provides for a water barrier for the wet vegetables and fruit. It is here also advantageous for the coating layer to be situated on the inner side of the bag.
- a first coating layer can be present on the first side and a second coating layer on the second side.
- This provides for an even better resistance to grease.
- Applying two coating layers makes it possible to apply a greater amount of coating layer to the paper, preferably more than 8 g/m 2 , more preferably more than 10 g/m 2 , more than 11 g/m 2 or even more than 12 g/m 2 , such as 12-20 g/m 2 .
- the current packaging paper for cheese and sliced meats which is provided with a layer of plastic, can hereby be replaced with paper which is recyclable and/or compostable.
- Fig. 1A shows a bread bag 10 in a first embodiment.
- Fig. 1B shows the same bread bag 10 in a slightly opened position.
- the bread bag is made of paper with a first side 11 and a second side 12.
- the first side 11 is here situated on the inner side of bread bag 10.
- On second side 12 an imprint 15 has been arranged on the paper, here in the form of a letter B.
- Bread bag 10 is provided with a lower edge 21 and an upper edge 22, a front side 24 and a rear side (not numbered). Side flaps 23 are present between front side 24 and the rear side.
- Bread bag 10 is made by providing a sheet of paper with folds in suitable manner and then glueing a first side edge to a second side edge, thus forming a sleeve. After separating a strip of paper into individual units, a part of front side 24 is folded along lower edge 21 and glued on the rear side.
- the type of bread bag with an upper edge 22 which rises from front side to rear side in two
- Imprint 15 is generally arranged on the first side and covered with a coating layer.
- the coating layer traditionally comprises a mineral oil, although good results have also been achieved with a vegetable oil. After application, the oil soaks into the paper. Owing to the oil, the water vapour permeability is set, such that bread maintains a crispy crust without drying out too quickly.
- Fig. 2 shows the paper which is applied in the bread bag 10 according to the invention.
- This paper is also referred to as a package of combined layers.
- the primary layer thereof is the cellulose layer 13, which in the shown embodiment is provided on one side with a smoother, less open, treated sub-layer 14.
- this sub-layer 14 is obtained by adding calcium carbonate on that side and/or by extra calendering and/or by filling with filler materials and/or refining fibres.
- This sub-layer 14 is for instance a layer which is filled with calcium carbonate (i.e. a cellulose layer comprising calcium carbonate, calcium carbonate layer for short).
- sub-layer 14 is obtained by extra addition of short fibres and filler materials and additional calendering of paper.
- Cellulose layer 13 is chosen such that it is suitable for packaging foodstuff and is normally supplied including sub-layer 14 by a paper manufacturer.
- the cellulose layer is open to the same extent on the first and on the second side (for instance with a tolerance of a maximum of 10%). This is for instance achieved by treating the paper on both sides, for instance as machine-glazed paper.
- sub-layer 14, if present, is situated on first side 11, i.e. the side which will be situated on the inner side of bread bag 10 after folding and glueing.
- the imprint is arranged on second side 12, which will later serve as outer side.
- second side 12 with a more open structure than first side 11 or with a structure which is open to the same extent on first side 11 and second side 12.
- a masking layer 16 is arranged on second side 12, particularly as a water-based layer of technical varnish. In the illustrated embodiment the varnish is free of dye concentrate. Addition of a dye is however not absolutely precluded.
- Masking layer 16 is preferably applied by means of flexography.
- a coating layer 17 which comprises an oily material such as paraffin or vegetable oil. The use of palm oil or soybean oil or mixtures thereof is favourable. The oils are in particular modified in usual manner, i.e. into esters, for instance with glycerol.
- Coating layer 17 is preferably applied by having a roller run through a bath of melted oil and transferring the coating layer from the roller to the paper.
- masking layer 16 which has penetrated to the first side, makes the paper less accessible to the oil of coating layer 17 on the first side. This has the result that less oil permeates the cellulose layer and that surprisingly good properties are obtained.
- the water vapour permeability lies in the same order of magnitude, even though less coating layer permeates into the cellulose layer at the positions where the masking layer has previously permeated into the cellulose layer of the bread bag. The aesthetic properties improve. It is suspected that when applied as aqueous suspension, masking layer 16 permeates partially into cellulose layer 13, 14 and there further closes pores of the cellulose layer 14.
- Fig. 3 shows schematically a detail of bread bag 10 as shown in Fig. 1A .
- This shows the pattern which results from the use of the combination of masking layer 16 and coating layer 17.
- masking layer 16 is applied in a pattern of parallel lines.
- On the inner side 11 of bread bag 10 the pattern is visible as dark lines 121 alternated with light lines. Dark lines 121 correspond to the positions where coating layer 17 is in contact with the cellulose layer. The light lines correspond to the positions where masking layer 16 is in contact with the cellulose layer.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Wrappers (AREA)
- Paper (AREA)
- Laminated Bodies (AREA)
Claims (15)
- Papier, lequel papier comprend différentes couches, comprenant une couche de cellulose (13) et une couche de revêtement (17), par exemple pour définir la perméabilité à l'humidité, dans lequel la couche de revêtement est située sur un premier côté (11) de la couche de cellulose et une couche de masquage (16) est présente sur un second côté (12) de la couche de cellulose, laquelle couche de masquage est dotée d'un motif prédéterminé et comprend un matériau liant qui imprègne la couche de cellulose, dans lequel la couche de cellulose a un poids spécifique de 60 g/m2 au maximum et une perméabilité à l'air Gurley (IS05636-5) de 100 secondes au maximum, dans lequel la couche de masquage a pénétré à travers la couche de cellulose vers le premier côté.
- Papier selon la revendication 1, dans lequel une première couche de revêtement est présente sur le premier côté et une seconde couche de revêtement sur le second côté.
- Papier selon la revendication 1 ou 2, caractérisé en ce que le motif de la couche de masquage est une configuration répétitive et comprend des éléments répétitifs, tels que par exemple une ligne comme élément répétitif.
- Papier selon les revendications 1 à 3, dans lequel la couche de masquage comprend en outre une encre sur la base d'un pigment inorganique, par exemple une encre blanche.
- Papier selon les revendications 1 à 4, dans lequel la couche de revêtement comprend une huile végétale.
- Papier selon les revendications 1 à 5, dans lequel la couche de revêtement a un poids de 3 à 25 g/m2, de préférence 4 à 15 g/m2.
- Papier selon les revendications 1 à 6, dans lequel la couche de cellulose comprend un mélange de fibre longue et de fibre courte, avec au moins 40 % de fibres longues, de manière davantage préférée au moins 50 % ou même au moins 70 %.
- Papier selon les revendications 1 à 7, dans lequel la couche de cellulose a une perméabilité à l'air Gurley de 60 secondes au maximum, de manière davantage préférée 40 secondes au maximum.
- Papier selon les revendications 1 à 8, dans lequel la couche de cellulose a un poids spécifique de 50 g/m2 au maximum, de manière davantage préférée 40 g/m2 au maximum.
- Papier selon la revendication 7, dans lequel la couche de cellulose comprend un mélange de fibre longue et de fibre courte, avec au moins 70 % de fibres longues, dans lequel la couche de cellulose a une perméabilité à l'air Gurley de moins de 50 secondes et un poids spécifique de moins de 50 g/m2.
- Papier selon l'une quelconque des revendications précédentes, dans lequel la couche de cellulose est ouverte dans la même mesure sur le premier et sur le second côté, de préférence en ce que la couche de cellulose est traitée sur les deux côtés, formant ainsi une sous-couche, par exemple avec un apprêt sur machine.
- Utilisation du papier selon l'une quelconque des revendications précédentes comme papier d'emballage pour des viandes tranchées et/ou du fromage, dans laquelle le papier est de préférence utilisé sous la forme de feuilles de papier.
- Sac à pain (10) de couches combinées, comprenant une couche de cellulose et une couche de revêtement pour définir la perméabilité à l'humidité, dans lequel la couche de revêtement est située sur le premier côté de la couche de cellulose, lequel sac à pain comprend le papier selon l'une quelconque des revendications précédentes 1 à 11, caractérisé en ce que- la couche de revêtement est située sur un côté intérieur du sac à pain ;- la couche de cellulose a un poids spécifique de 60 g/m2 au maximum et une perméabilité à l'air Gurley (IS05636-5) de 100 secondes au maximum ;- une couche de masquage est présente sur un second côté de la couche de cellulose, laquelle couche de masquage est dotée d'un motif prédéterminé et comprend un matériau liant qui imprègne la couche de cellulose localement, dans lequel la couche de masquage a pénétré à travers la couche de cellulose vers le premier côté.
- Sac pour des légumes et/ou des fruits, comprenant le papier selon l'une quelconque des revendications 1 à 11, dans lequel la couche de revêtement est configurée comme une barrière à l'eau, dans lequel la couche de revêtement est de préférence située sur le côté intérieur du sac.
- Utilisation du papier selon l'une quelconque des revendications 1 à 11 et/ou du sac selon la revendication 14 pour emballer des légumes et/ou des fruits.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BE20185680A BE1026680B1 (nl) | 2018-10-04 | 2018-10-04 | Broodzak en werkwijze voor het vervaardigen ervan |
Publications (2)
Publication Number | Publication Date |
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EP3643634A1 EP3643634A1 (fr) | 2020-04-29 |
EP3643634B1 true EP3643634B1 (fr) | 2021-07-14 |
Family
ID=63857654
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP19201224.3A Active EP3643634B1 (fr) | 2018-10-04 | 2019-10-03 | Papier, sac à pain et methode pour sa fabrication |
Country Status (2)
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EP (1) | EP3643634B1 (fr) |
BE (1) | BE1026680B1 (fr) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11794976B2 (en) | 2020-07-30 | 2023-10-24 | The Procter And Gamble Company | Recyclable absorbent article package material |
US12076221B2 (en) | 2020-07-30 | 2024-09-03 | The Procter & Gamble Company | Natural fiber-containing packages for absorbent articles |
US12090034B2 (en) | 2020-07-30 | 2024-09-17 | The Procter & Gamble Company | Recyclable absorbent article package material |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA253627A (fr) | 1925-09-15 | Frisch Emile | Papier cire d'emballage | |
EP0298003A1 (fr) | 1987-06-26 | 1989-01-04 | Raymond Morin, S.A. | Emballage en particulier pour fromage à pâte molle, à croûte fleurie entier |
US20030152724A1 (en) | 1997-02-26 | 2003-08-14 | Fort James Corporation | Coated paperboards and paperboard containers having improved tactile and bulk insulation properties |
FR3008392A1 (fr) | 2013-07-15 | 2015-01-16 | Ace Packaging Nv | Sac pour la conservation du pain. |
EP3396065A1 (fr) | 2017-03-24 | 2018-10-31 | Ace Packaging NV | Sac a pain et sa methode de fabrication |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4798574A (en) * | 1987-12-09 | 1989-01-17 | Bagcraft Corporation Of America | Method of making a bag with a barrier material |
DE102016117907B3 (de) * | 2016-09-22 | 2018-01-04 | Wihuri Packaging Oy | Strukturiert bedruckte Verpackungsfolie |
-
2018
- 2018-10-04 BE BE20185680A patent/BE1026680B1/nl not_active IP Right Cessation
-
2019
- 2019-10-03 EP EP19201224.3A patent/EP3643634B1/fr active Active
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA253627A (fr) | 1925-09-15 | Frisch Emile | Papier cire d'emballage | |
EP0298003A1 (fr) | 1987-06-26 | 1989-01-04 | Raymond Morin, S.A. | Emballage en particulier pour fromage à pâte molle, à croûte fleurie entier |
US20030152724A1 (en) | 1997-02-26 | 2003-08-14 | Fort James Corporation | Coated paperboards and paperboard containers having improved tactile and bulk insulation properties |
FR3008392A1 (fr) | 2013-07-15 | 2015-01-16 | Ace Packaging Nv | Sac pour la conservation du pain. |
EP3396065A1 (fr) | 2017-03-24 | 2018-10-31 | Ace Packaging NV | Sac a pain et sa methode de fabrication |
EP3702529A1 (fr) | 2017-03-24 | 2020-09-02 | Ace Packaging NV | Sac à pain et son procédé de fabrication |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11794976B2 (en) | 2020-07-30 | 2023-10-24 | The Procter And Gamble Company | Recyclable absorbent article package material |
US12076221B2 (en) | 2020-07-30 | 2024-09-03 | The Procter & Gamble Company | Natural fiber-containing packages for absorbent articles |
US12090034B2 (en) | 2020-07-30 | 2024-09-17 | The Procter & Gamble Company | Recyclable absorbent article package material |
Also Published As
Publication number | Publication date |
---|---|
EP3643634A1 (fr) | 2020-04-29 |
BE1026680A1 (nl) | 2020-04-30 |
BE1026680B1 (nl) | 2020-05-07 |
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