EP4183919A1 - Verpackungsmaterial aus cellulosefolie mit durch beschichten hergestellter transparenz - Google Patents

Verpackungsmaterial aus cellulosefolie mit durch beschichten hergestellter transparenz Download PDF

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Publication number
EP4183919A1
EP4183919A1 EP22208341.2A EP22208341A EP4183919A1 EP 4183919 A1 EP4183919 A1 EP 4183919A1 EP 22208341 A EP22208341 A EP 22208341A EP 4183919 A1 EP4183919 A1 EP 4183919A1
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EP
European Patent Office
Prior art keywords
layer
coating
cellulose
packaging material
coating layer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP22208341.2A
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English (en)
French (fr)
Inventor
Ramiz AGPINAR
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Intersac
Original Assignee
Intersac
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 Intersac filed Critical Intersac
Publication of EP4183919A1 publication Critical patent/EP4183919A1/de
Pending legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/10—Packing paper
    • 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
    • B65D5/00—Rigid or semi-rigid containers of polygonal cross-section, e.g. boxes, cartons or trays, formed by folding or erecting one or more blanks made of paper
    • B65D5/42—Details of containers or of foldable or erectable container blanks
    • B65D5/4204—Inspection openings or windows
    • 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
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/72—Coated paper characterised by the paper substrate
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes

Definitions

  • the present invention relates to the manufacture and use of sheet materials having a certain at least partially localized transparency, more particularly intended for the field of packaging, and even more specifically for the packaging of food products.
  • the paper which relates to the invention is mainly made of cellulose, the transparency then being obtained by coating.
  • the invention also relates to a corresponding coating process, a device for coating strips of paper with a view to the constitution of the materials according to the invention, as well as packaging made of said material.
  • the invention responds to a growing need expressed by the food industry, mainly mass distribution, to provide visibility to bagged food products.
  • the idea is of course that the consumer can have informative visual access to what he is buying.
  • customers as much as manufacturers want food packaging that is respectful of the environment.
  • the objective of the invention is to create a packaging material entirely in paper, therefore mono-material, with the possibility of a transparent zone on at least a fraction of the surface of the packaging.
  • Such a product therefore responds to new demands due to the renewable nature of cellulose allowing complete recyclability of the packaging.
  • it is a question of creating a cellulose-based material which is able to present total or partial transparency, over at least part of the packaging.
  • the uniqueness of the material gives the packaging an enormous added value in practice, especially but not exclusively in the food sector.
  • the coating of paper to obtain a more or less successful transparency is already known, for example described in the document CN112853816A which discloses the manufacture of a transparent paper used to manufacture food packaging bags, or to make windows to be placed on food packaging boxes, from kraft paper coated with a preferably edible oil.
  • CN203753586U discloses a crystal paper bag with a window formed by making locally transparent an area of a sheet of paper from which said bag is made. Note that the base material of the bag is already translucent, and the more transparent window is achieved by applying a coating of wax to the glassine.
  • JP19890130188 describes the coating on a specific area of an opaque or translucent base paper with an oily solvent such as paraffin or with a silicone-based solution, so as to transform this area into a transparent surface.
  • FR628956A discloses a process for manufacturing transparent papers intended in particular for the packaging of food products, process according to which the paper to be made transparent is coated with a solution of gelatin or the like. The process consists more precisely in coating the paper with a gelatin solution which, after drying, then becomes transparent. Depending on the degree of transparency required, the gelatinous solution can be applied to one or both sides of the paper.
  • glassine type paper or glassine paper for the same objectives also results from the description of GB323302 , the paper then being impregnated with a solution of castor oil or the like and a methylated spirit type solvent containing an aromatic hydrocarbon such as benzol.
  • the document FR 3 008 392 does disclose a paper consisting of a coated cellulose layer, but this invention is more particularly focused on the coating, in this case the weight of the induction layer and the fact that it comprises a vegetable oil, the characteristics put forward for the cellulose layer being limited to the proportions of long and short fibres.
  • the most important part of the sheet materials rendered transparent in the field of the invention obviously remains the layer of paper, which is the main substrate secondarily supporting the coating layer.
  • a light weight paper is certainly less strong than a heavy weight paper, but it is also less opaque.
  • the choice of grammage, with a view to the aforementioned compromise, is therefore important.
  • papers with long fibers are certainly stronger than papers with short fibers, but the ratio between long and short fibers has an impact on the opacity of the paper, and it is therefore not conceivable to do without short fibres, at the risk of sacrificing transparency in favor of solidity.
  • Machine direction and cross machine direction practically refer to the continuous web manufacture of the paper, the web then being wound into reels for storage purposes.
  • the running direction is the unwinding direction of the reel ('long grain' in English), that is to say the axial direction of the strip.
  • the cross direction refers to a perpendicular, rather transverse direction.
  • the cellulose layer should preferably have a cloudy appearance, the corresponding structure of the paper proving to be particularly suitable for obtaining transparency where the coating layer is applied.
  • the par denotes an aspect of the structure of the paper observable by transparency, well known to those skilled in the art.
  • the pair can thus be qualified as regular or melted, irregular or cloudy, according to the more or less homogeneous distribution of the fibers: the qualifier attributed to the pair is immediately recognizable for the person skilled in the art who examines it. It is cloudy when the distribution is irregular and fluffy.
  • a cloudy patch means that the internal appearance of the cellulose layer is cloudy when it is observed by transparency in front of a light source.
  • the coating layer comprises vegetable wax, or animal wax or fat, or mineral paraffin, or a mixture of at least two of them.
  • the coating is used to improve the preservation characteristics of the packaging, its essential function - within the scope of the invention - of providing transparency on all or part of said packaging .
  • the coating layer has a weight of between 1 g/m 2 and 10 g/m 2 , more preferably still of between 4 g/m 2 and 8 g/m 2 .
  • the invention also relates to a process for manufacturing sheet packaging material as presented above, that is to say consisting essentially of a layer of cellulose coated with a coating layer, the process being such that the temperature for depositing said coating layer on the cellulose layer is between 50°C and 200°C or, preferably, between 60°C and 180°C.
  • the deposition temperature depends on the nature of the coating material (wax, paraffin, grease or oil). It may vary in order to guarantee good transparency and usability of the packaging at room temperature, or even at a temperature slightly higher than normal.
  • the cellulose layer covered with the coating layer is cooled at least once between 0° C. and 10° C., preferably between 2° C. and 6°C. This cooling is carried out by means of a cooling system comprising one or more successive cooling stages, making it possible to perpetuate the bond between the coating layer and the cellulose base layer.
  • a paper web printing stage can be arranged upstream of the coating rollers.
  • the coating of the cellulose is in fact generally carried out after the printing, total or partial, of the layer of cellulose.
  • the invention also relates to bag-type packaging made of packaging material according to the characteristics described above, which comprise at least one portion covered with a coating layer forming a transparent zone.
  • the manufacture of bags can then be carried out in various forms, for example by gluing a section of the packaging material as described, that is to say in fact at least one layer of cellulose coated with the coating layer of the invention on another side of the material, coated or not, so as to form a bag, said bag naturally comprising at least one opening.
  • the packaging concerned may be a box with a cardboard frame comprising at least one wall made of sheet packaging material according to the characteristics described above, which is then such that said at least one wall comprises at least one portion covered with a coating layer forming a transparent zone.
  • the invention as described has the preponderant advantage of allowing manufacture by dispensing with supply channels for transparent paper, which leads to a significant drop in production costs.
  • the technical characteristics of the two layers forming the packaging material are moreover such that the degree of transparency achieved can exceed 60%, reach 80%, or even 90% for certain combinations of characteristics.
  • only a portion of the packaging is made transparent, that is to say that the coating of the coating layer is applied by precisely delimiting it, so as to create a window in a bag or in a packaging which otherwise remains opaque.
  • the invention as a whole eliminates the need to separate a polymer window from the cellulose fiber part for recycling. and/or the composting of bags and packaging, which greatly facilitates these operations.
  • FIG. 1 represents a schematic view of a production line for a paper packaging material comprising a layer of cellulose which is coated with an additional layer as defined above, giving it at least localized transparency allowing consumers to see the packaged product;
  • FIG. 2 shows a schematic view of a bag according to the invention, one of the faces of which is provided with a transparent window obtained according to the invention.
  • the device appearing in figure 1 comprises successive rollers which guide and drive the strip of cellulose 1 towards a tray 2 containing a coating product 3 brought to a sufficient temperature for it to be in liquid form.
  • This coating temperature varies according to the nature of the coating product, which may be of plant, animal or mineral origin and, more particularly, may consist of wax, paraffin, grease, oil, etc. As indicated by the cartridge present in tray 2, said temperature can vary between 50°C and 200°C. It is ideally between 60°C and 180°C, in order to guarantee good transparency of the two-layer material, and consequently good usability of the bags, boxes, or other packaging at room temperature or a little higher.
  • two rollers 4, 5 ensure both the laying of the coating liquid on one side of the continuous strip of cellulose 1 - since only the roller 4 dips in said coating liquid - and the guiding of said strip 1 .
  • This system is in this case composed of two cooling rollers 6, 7 brought to a temperature between 0 and 10°C (see in particular the cartridges on said rollers 6, 7) and, more particularly, at a temperature of between 2 and 6°C.
  • Entry rollers 10, 11 and exit rollers 20, 21 complete the device, and make it possible to respectively guide the cellulose strip 1 towards the tray 2 at the entrance, and the bilayer strip towards the exit and possibly other stations.
  • processing for example a station for cutting sections of paper adapted to the type of packaging to be manufactured, and/or a gluing station. It should be noted that if a printed decoration must be applied to the paper, and/or a printing of information, it is done upstream of the coating rollers 4, 5, at the level or upstream of the entry rollers 10, 11.
  • the bag 30 of the figure 2 takes the form of an expandable flattenable pouch due to the existence of lateral bellows 31, 32 and a bottom 33 of substantially the same width, folding against one of the two sides main 34, 35 forming said bag 30.
  • One of these two sections 34, 35 comprises a window 36 obtained by coating with a layer of wax or varnish according to the invention.
  • the present invention makes it possible to make visible by transparency all or part of the contents of a packaging made of a material based on 100% cellulose, such as for example a bag, or which comprises a part with such a material, or a box whose a section is made up of it.
  • a packaging made of a material based on 100% cellulose, such as for example a bag, or which comprises a part with such a material, or a box whose a section is made up of it.
  • a packaging made of a material based on 100% cellulose, such as for example a bag, or which comprises a part with such a material, or a box whose a section is made up of it.
  • a visibility approaching plastic packaging that is to say which has a degree of opacity less than 40%, which can be lowered to 20%, knowing that it is even possible to reach 10%, which moreover constitutes the preferential objective.
  • polymers are totally eliminated, which makes them easily recyclable or compostable.
  • This type of packaging leads to a reduction

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wrappers (AREA)
  • Laminated Bodies (AREA)
EP22208341.2A 2021-11-23 2022-11-18 Verpackungsmaterial aus cellulosefolie mit durch beschichten hergestellter transparenz Pending EP4183919A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
BE20215911A BE1029401B1 (fr) 2021-11-23 2021-11-23 Matériau d’emballage en feuille cellulosique à transparence obtenue par enduction

Publications (1)

Publication Number Publication Date
EP4183919A1 true EP4183919A1 (de) 2023-05-24

Family

ID=81327548

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22208341.2A Pending EP4183919A1 (de) 2021-11-23 2022-11-18 Verpackungsmaterial aus cellulosefolie mit durch beschichten hergestellter transparenz

Country Status (2)

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EP (1) EP4183919A1 (de)
BE (1) BE1029401B1 (de)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR628956A (fr) 1926-10-09 1927-11-02 Klotz Geb Procédé de fabrication de papiers transparents destinés notamment à l'emballage de produits alimentaires
GB323302A (en) 1928-10-30 1930-01-02 James Chamberlain Improvements in or relating to transparent sheet material
JPH0130188B2 (de) 1976-01-14 1989-06-16 Pitney Bowes
CN203753586U (zh) 2013-10-18 2014-08-06 卢壮兴 可透视内容物的纸袋改良结构
FR3008392A1 (fr) 2013-07-15 2015-01-16 Ace Packaging Nv Sac pour la conservation du pain.
CN112853816A (zh) 2021-01-19 2021-05-28 厦门吉宏科技股份有限公司 一种食品级超透明纸及其生产工艺、生产设备、应用

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR628956A (fr) 1926-10-09 1927-11-02 Klotz Geb Procédé de fabrication de papiers transparents destinés notamment à l'emballage de produits alimentaires
GB323302A (en) 1928-10-30 1930-01-02 James Chamberlain Improvements in or relating to transparent sheet material
JPH0130188B2 (de) 1976-01-14 1989-06-16 Pitney Bowes
FR3008392A1 (fr) 2013-07-15 2015-01-16 Ace Packaging Nv Sac pour la conservation du pain.
CN203753586U (zh) 2013-10-18 2014-08-06 卢壮兴 可透视内容物的纸袋改良结构
CN112853816A (zh) 2021-01-19 2021-05-28 厦门吉宏科技股份有限公司 一种食品级超透明纸及其生产工艺、生产设备、应用

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