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
  • B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
  • B65D65/02—Wrappers or flexible covers
  • B65D65/16—Wrappers or flexible covers with provision for excluding or admitting light
  • B65D65/18—Wrappers or flexible covers with provision for excluding or admitting light with some areas transparent and others opaque
• • 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
  • B65D65/02—Wrappers or flexible covers
  • B65D65/16—Wrappers or flexible covers with provision for excluding or admitting light
• • 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
  • B65D85/34—Containers, packaging elements or packages, specially adapted for particular articles or materials for articles particularly sensitive to damage by shock or pressure for fruit, e.g. apples, oranges or tomatoes

Definitions

• the present invention relates to the field of flexible paper packaging for automatic machines, in particular flexible transparent paper packaging.
• food packaging such as fruit and vegetable packaging is made of plastic material, usually polypropylene.
• Polypropylene is typically supplied to packers in the form of bags or rolls of film. Depending on the areas of activity, the conditioning activity material may be different.
• polypropylene is especially preferred by users of manufactured bags which will then be closed.
• Gas exchange oxygen/CO 2
• permeability to water vapor are often required for the preservation of these products.
• perforating the packaging with laser or hot needles or macro-perforating to optimize conservation according to the products packaged.
• the present invention relates to a paper packaging having a moisture permeability of less than or equal to 10 g H 2 O/m 2 /24h, said packaging being capable of sealing on itself, said packaging comprising at least one transparent paper.
• the paper wrapper is free of plastic polymer.
• said transparent paper comprises at least one layer of sealing varnish.
• said transparent paper comprises from 1 to 12 g/m 2 of dry extract of sealing varnish.
• said transparent paper comprises at least one layer of hydrophobic varnish, said hydrophobic varnish preferably being microwaveable.
• said transparent paper comprises 2 to 10 g/m 2 of dry extract of hydrophobic varnish.
• the sealing varnish is identical to the hydrophobic varnish.
• the paper packaging is completely transparent, possibly with one or more printed areas.
• the paper packaging comprises at least one transparent part and at least one opaque part, said opaque part being for example made of kraft paper, such as brown kraft.
• the paper packaging has an oxygen permeability less than or equal to 500 cm 3 /m 2 /24h, preferably less than or equal to 300 cm 3 /m 2 /24h, even more preferably less than or equal to 200 cm 3 /m 2 /24h, or even less than or equal to 150 cm 3 /m 2 /24h.
• the paper packaging is in the form of a reel of film, a reel of bags or preformed bags.
• the method according to the invention comprises a step in which opaque paper, such as kraft paper is combined on a part of the transparent paper before step b).
• the present invention thus proposes a plastic polymer-free food packaging that is particularly useful for fruit and vegetable producers who do not have currently no solution to continue to operate their packaging workshops given the new restrictions (AGEC law in France).
• the food packaging according to the invention has barrier properties (Humidity and optionally oxygen/CO 2 ) equivalent to the plastic products traditionally used for food packaging.
• the packaging according to the invention makes it possible to keep the conservation of food products in order to respect the best-before dates (DLUO) that are usual today for packaged foods.
• DLUO best-before dates
• the packaging according to the invention makes it possible to have a recyclable packaging
• the packaging according to the invention makes it possible to have a transparent packaging, and this without the use of a transparent plastic film.
• the invention makes it possible to provide a sealing package operating on different automatic packaging machines.
• the invention makes it possible to provide a transparent packaging for preservation, oven cooking and/or microwave.
• the packaging according to the invention can be printed using different techniques, in Flexography/Heliography/Offset/Digital.
• the print quality on the paper packaging according to the invention is as good and simple to implement as on the plastic films.
• the present invention relates to a paper packaging having a moisture permeability of less than or equal to 10 g H 2 O/m 2 /24h, said packaging being capable of sealing itself, said packaging comprising at least one transparent paper.
• the paper packaging according to the invention is a packaging intended to be implemented in automatic machines, typically machines for packaging foodstuffs, such as fruits and vegetables.
• Moisture permeability can be measured according to ASTM F 1249, typically at 37.8°C and 100% relative humidity.
• the moisture permeability of the paper packaging according to the invention ranges from 3 to 10 g H 2 O/m 2 /24 h, more preferably from 3 to 8 g H 2 O/m 2 /24 h.
• the packaging according to the invention is a paper-based packaging and will thus typically be free of plastic polymers, for example free of plastic film.
• paper packaging in its final form
• having a transparent window comprises a transparent film.
• the paper packaging according to the invention comprises at least one transparent paper.
• the transparent paper can be of the glassine or crystal type.
• the paper packaging according to the invention can also comprise a non-transparent paper on a part of the paper packaging according to the invention, so that the final packaging comprises at least one transparent part.
• the transparent part will make it possible to visualize the contents of the packaging once the packaging has been packaged, we will then speak of “final packaging”.
• the contents of the final package will typically be a foodstuff, such as fruits or vegetables.
• a paper has two sides. The side of the paper will be called external when it is not intended to be in contact with foodstuffs and the side of the paper will be called internal when it is intended to be in contact with foodstuffs.
• the packaging according to the invention is capable of sealing on itself, it is then called “sealing”.
• the packaging according to the invention may comprise one or more layers of sealing varnish in order to obtain sealability.
• the sealing varnish may be aqueous or organic based.
• the sealing varnish comprises at least one acrylic polymer or copolymer emulsion and at least one wax, said wax possibly being chosen from a paraffin wax, a grafted paraffin wax, a crystalline wax, a polyethylene wax, a wax high density polyethylene.
• sealing varnish By way of non-limiting example of sealing varnish, mention may be made of the varnish SunStar® SPEF854 from the company SunChemical.
• the sealing varnish can thus be present at a rate of 1 to 12 g/m 2 of dry extract, preferably from 3 to 11 g/m 2 of dry extract, more preferably from 5 to 10 g/m 2 on the paper .
• the sealing varnish can be applied directly to the paper or else to the paper previously coated with a layer, for example another layer of varnish, lacquer or ink.
• the sealing varnish is applied directly to the paper (before any other layer of varnish).
• the sealing varnish is applied in several layers.
• the sealing varnish is present on the internal face of the paper and advantageously only on the internal face of the paper.
• the sealing varnish can be used to define a sealing zone.
• the packaging according to the invention will comprise a sealing zone in which the sealing varnish will be "free", that is to say the sealing varnish will be the upper layer in the case where the paper packaging comprises in some places several coats of different varnishes.
• the sealing zone corresponds to the zone where the paper packaging will be sealed on itself during the final use of the food packaging.
• the packaging according to the invention comprises, in addition to a transparent paper, also an opaque paper, then preferably, the sealing zone will be at the level of the opaque paper, so that the paper packaging can be sealed, after insertion of foodstuff food(s) at the level of the opaque paper and in this case, the final packaging will include a visible part thanks to the transparent paper.
• the packaging according to the invention comprises areas printed, generally with ink, then preferably the sealing area will be chosen outside the printed areas so as not to interfere with the graphics of the prints.
• the packaging according to the invention may comprise one or more layers of hydrophobic varnish in order to obtain the permeability to humidity less than or equal to 10 g H 2 O/m 2 /24h or even less than or equal to 8 g H 2 O /m 2 /24h.
• the hydrophobic varnish may be aqueous or organic based.
• a varnish in the form of an acrylic dispersion for example the varnish LOCTITE LIOFOL HS 59-605® from the company Loctite.
• the hydrophobic varnish can thus be present at a rate of 2 to 10 g/m 2 of dry extract, preferably from 3 to 9 g/m 2 of dry extract on the paper.
• the hydrophobic varnish can be applied directly to the paper or else to the paper previously coated with a layer, for example another layer of varnish, lacquer or ink.
• the hydrophobic varnish is present on both sides of the paper.
• the hydrophobic varnish is applied on one side to the paper coated with one or more layers of sealing varnish and on the other side directly to the paper.
• the hydrophobic varnish is applied in several layers, and this if necessary on each side of the paper.
• the hydrophobic varnish is a microwaveable varnish. This will make it possible to bring the microwaveable property to the packaging according to the invention.
• a microwaveable varnish is a varnish that can go in the microwave.
• the packaging according to the invention will comprise at least two different varnishes.
• the packaging according to the invention may have an oxygen permeability of less than or equal to 1000 cm 3 /m 2 /24h.
• Oxygen permeability can be measured according to ASTM D3985, typically at 23°C and 50% relative humidity.
• the paper packaging has an oxygen permeability less than or equal to 500 cm 3 /m 2 /24h, preferably less than or equal to 300 cm 3 /m 2 /24h, even more preferably less than or equal to 200 cm 3 /m 2 /24h, or even less than or equal to 150 cm 3 /m 2 /24h.
• the oxygen permeability can be chosen according to the foodstuffs intended to be packaged in the paper packaging according to the invention.
• the packaging according to the invention may optionally comprise one or more layers of another varnish, different from the sealing varnish and different from the hydrophobic varnish, in order to obtain oxygen permeability of less than or equal to 500 cm 3 /m 2 /24h, preferably less than or equal to 300 cm 3 /m 2 /24h, more preferably less than or equal to 200 cm 3 /m 2 /24h, or even less than or equal to 150 cm 3 /m 2 /24h.
• Said “oxygen barrier” varnish may be aqueous or organic based.
• a varnish providing additional oxygen barrier properties By way of non-limiting example of a varnish providing additional oxygen barrier properties, mention may be made of the AEROBLOC ENHANCE® varnish from the company SunChemical.
• the “oxygen barrier” varnish can thus be present at a rate of 0.5 to 7 g/m 2 of dry extract, preferably from 1 to 5 g/m 2 of dry extract on the paper.
• the “oxygen barrier” varnish can be applied directly to the paper or else to the paper previously coated with a layer, for example another layer of varnish, lacquer or ink.
• the “oxygen barrier” varnish is present on both sides of the paper.
• the “oxygen barrier” varnish is applied on one side to the paper coated with one or more layers of sealing varnish and on the other side directly to the paper.
• the “oxygen barrier” varnish is applied in several layers, and this if necessary on each side of the paper.
• the paper packaging according to the invention may optionally include perforations.
• perforations are implemented, for example, in the case of foodstuffs loaded with moisture, these perforations can have a size ranging from 80 ⁇ m to 10 mm, preferably ranging from 80 ⁇ m to 2 mm.
• the perforations are not always necessary in the case of the paper packaging according to the invention. Indeed, the oxygen permeability is sometimes sufficient in the absence of perforations for the paper packaging according to the invention. According to one embodiment, the paper packaging does not include perforations.
• the varnish(es) used in the invention is (are) typically varnishes suitable for food contact (“Food Direct Contact”) and in accordance with Regulation (EC) No. 2023/2006.
• the paper packaging is entirely transparent, based on transparent paper.
• the paper packaging according to the invention comprises a transparent part and an opaque part.
• the packaging according to the invention can comprise an opaque paper, for example kraft, associated with a transparent paper, the association making it possible to leave a transparent part for the final packaging.
• the paper packaging according to the invention can optionally be printed.
• Printing can be implemented using various known techniques: flexography, heliography, offset and digital.
• Water-based or organic-based inks can be used for printing.
• impressions can be made before or after the application of the layers of varnish, preferably before the application of the layers of varnish.
• the packaging according to the invention can be in the form of a reel of film, a reel of bags or preformed bags.
• the paper packaging comprises two or three layers including a layer of sealing varnish and a layer of hydrophobic varnish, the third layer being chosen from a layer of sealing varnish, a layer of hydrophobic varnish and a layer of "barrier to oxygen".
• the paper packaging comprises at least three layers including at least one layer of sealing varnish and at least one layer of hydrophobic varnish, a third layer being chosen from a layer of varnish sealant, a layer of hydrophobic varnish and a layer of "barrier to oxygen" varnish.
• the sealing varnish is located outside the packaging to allow the sealability of said packaging.
• the invention also relates to a process for preparing the packaging according to the invention.
• varnish(es) defined in the context of the method of the invention may have the characteristics defined in the context of the packaging according to the invention.
• the paper defined in the context of the method of the invention may have the characteristics defined in the context of the packaging according to the invention.
• Application zones can be delimited according to the desired printing zones and/or sealing zones.
• said layers can be implemented with the same varnish and/or with different varnishes and said layers can be of the same thickness or of different thickness.
• the paper packaging comprises one or more printings, then preferably, the printing step or steps are carried out before the varnish application step or steps.
• the preparation process will include a drying step, for example in a drying box in which an air exchange may take place, with air injection and air suction.
• the preparation process will preferably include drying, for example by passing through a tunnel. This is particularly useful when the packaging according to the invention is put in the form of a reel, in order to avoid transfers of varnish.
• the possibly microwavable hydrophobic varnish may be identical to or different from the sealing varnish.
• the hydrophobic varnish will be applied in such a way as to leave a sealing zone with “free” sealing varnish (without hydrophobic varnish).
• the preparation process according to the invention may also comprise a step of shaping the paper packaging, for example in the form of a reel or in the form of bags.
• the packaging according to the invention can be recycled.
• the packaging according to the invention is in the form of preformed bags, manufacture is very simple.
• a sealing machine equipped with a sealing clamp can be used to close the bag.
• the packaging according to the invention is in the form of a reel of film, then automatic machines of the bagging type, vertical or horizontal, can be used to form the bag.
• micro 80 ⁇ m to 1 mm
• macro 8-10 mm
• the packaging in the form of a reel thus obtained has barrier functions to oxygen and to humidity.
• the paper wrap according to this example is a microwaveable wrap that can be sealed and has good moisture barrier properties.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Wrappers (AREA)
• Laminated Bodies (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=76523183

Family Applications (1)

Country Status (2)

Citations (3)

• 2021
  • 2021-05-27 FR FR2105557A patent/FR3123331B1/fr active Active
• 2022
  • 2022-05-24 EP EP22175238.9A patent/EP4095065A1/de active Pending

Patent Citations (3)

Also Published As

Similar Documents

Legal Events