Laminated packaging material, comprising a cardboard base coated with an anti-abrasive paper coating

Abstract

Title: Laminated packaging material, comprising a cardboard base coated with an anti-abrasive paper coating. The invention relates to a laminated packaging material, comprising at least one cardboard base (10) coated on at least one of its faces with an anti-abrasive coating, characterized in that the anti-abrasive coating is a sheet of paper (11) comprising a maximum of five mineral-type grains with a diameter between 100 and 150 microns per square meter of paper, one face (110) of the paper sheet being applied to the cardboard base, the other face (111) of the paper sheet being coated with a coating comprising a wax. Figure for the abstract: Fig. 1

Description

Title of the invention: Laminated packaging material, comprising a cardboard base coated with an anti-abrasive paper coating

[0001] The field of the invention is that of the design and manufacture of cardboard packaging materials, in particular but not exclusively for the production of dividers delimiting spaces intended to receive bottles or other containers.

[0002] In the field of the invention, the use of cardboard to make packaging has long been widespread.

[0003] In a particular application, cardboard strips are shaped with regularly spaced slits so that they can overlap another identical cardboard strip by extending perpendicularly to each other. According to this principle, with an appropriate number of cardboard strips, dividers can be made to fit inside a cardboard box, such that the dividers extend over the entire surface of the bottom of the cardboard box.

[0004] Thus, such crossbars delimit spaces for bottles, for example, and in particular glass bottles containing perfume, cosmetic products...

[0005] However, some players in the perfume or cosmetics industry who use cartons with dividers for shipping their bottles require special care to be taken with their bottles. In particular, they need assurance that the bottles and / or their labels are not damaged in any way during shipping, especially regarding potential scratches caused by the bottle or its label rubbing against the dividers.

[0006] Indeed, a cardboard material is by nature more or less abrasive and can cause such scratches.

[0007] Also, to avoid scratches due to friction against the cardboard, a prior art solution consists of applying a plastic coating to the side of the cardboard that may come into contact with the transported products.

[0008] In this way, a smooth, non-abrasive surface is obtained, which allows the transported products to remain intact.

[0009] That being said, cardboard coated with a plastic film becomes more difficult to recycle and, in general, the use of plastic material becomes a means to be avoided for reasons of environment and sustainable development.

[0010] The invention aims in particular to overcome this drawback of the prior art.

[0011] More specifically, the invention aims to provide a laminated packaging material comprising a cardboard base layer, preferably made from fibers recycled or regenerated, which has anti-abrasive properties, without resorting to a plastic-type coating.

[0012] The invention also aims to provide such a packaging material which can be manufactured simply and cheaply.

[0013] These objectives, as well as others which will appear subsequently, are achieved thanks to the invention which relates to a laminated packaging material, comprising at least one base cardboard coated on at least one of its faces with an anti-abrasive coating, characterized in that the anti-abrasive coating is a sheet of paper including a maximum of five mineral-type grains with a diameter between 100 and 150 microns per square meter of paper, one face of the sheet of paper being applied to the base cardboard, the other face of the sheet of paper being coated with a coating comprising a wax.

[0014] In this way, the laminated packaging material having a "cardboard" base layer is given anti-abrasive properties, by replacing the prior art anti-abrasive plastic film with a paper coating specially designed for its anti-abrasive properties.

[0015] Thus, we obtain a material that respects environmental and sustainable development considerations, the material obtained being fully biodegradable.

[0016] According to an advantageous embodiment, the coating represents between 6% and 7.5% by mass of the sheet of paper which also comprises between 91% and 95% of a cellulose fiber pulp.

[0017] Preferably, the sheet of paper comprises by mass: - 92.4% of a cellulose fiber pulp - 6.8% plaster - 0.8% of a binding agent additive

[0018] According to an advantageous solution, the sheet of paper has a thickness between 48 pm and 60 pm, and preferably a thickness of 54 pm.

[0019] According to an advantageous embodiment, the sheet of paper has a tensile strength of about 4 kN / m2 on its coated face.

[0020] According to a particular embodiment, the material comprises three layers of recycled or regenerated fibers joined together to form the basic cardboard, and in particular to form a basic flat cardboard.

[0021] Other features and advantages of the invention will become more apparent upon reading the following description of a preferred embodiment of the invention, given by way of simple illustrative and non-limiting example, and the accompanying drawings, among which:

[0022] [Fig-1] ; [Fig.1] schematically illustrates a laminated packaging material according to a particular embodiment of the invention;

[0023] [Fig.2] ; [Fig.2] schematically illustrates an installation for the manufacture of a laminated packaging material according to the invention.

[0024] With reference to [Fig.1], a laminated packaging material 1 is described below, comprising at least a base cardboard 10, coated on at least one of its faces with an anti-abrasive coating.

[0025] According to the invention, the anti-abrasive coating is a sheet of paper 11 including a maximum of five mineral-type grains with a diameter between 100 and 150 pm per square meter of paper.

[0026] This sheet of paper 11 has one face 110 applied to the cardboard base layer 10, the other face 111, opposite the face 110 of the sheet of paper, is coated with a coating comprising a wax.

[0027] Preferably, the wax of the coating is a natural wax.

[0028] According to the embodiment illustrated in [Fig.1], the base cardboard 10 of the laminated packaging material consists of three layers of recycled or regenerated fibers 100 bonded to each other.

[0029] As illustrated by [Fig.1], the base cardboard 10 is sandwiched between two sheets of paper 11, each with one face applied to the base cardboard and the other face 111 coated with a coating comprising a natural wax.

[0030] According to advantageous features of the invention, the coating represents between 6% and 7.5% by mass of the paper sheet, which is otherwise made up of a cellulosic fiber pulp representing 91% to 94% by mass of the paper sheet.

[0031] According to an advantageous embodiment, the sheet of paper comprises: - 92.4% of a cellulose fibre pulp - 6.8% plaster - 0.8% of a binding agent additive

[0032] Furthermore, the sheet of paper 11, or each sheet of paper 11, has a thickness between 48 pm and 60 pm, and preferably a thickness of 54 pm.

[0033] In addition, the sheet of paper 11, or each sheet of paper 11, has a tensile strength of about 4 kN / m2 on its coated face 111.

[0034] Furthermore, the sheet of paper 11, or each sheet of paper 11, may also have the following characteristics: - it has a weight of 45 g / m2; - it has a humidity level of 4 to 5%, and preferably 4.5%, before glued onto the cardboard base layer; - it has a whiteness level of 80 CIE, D65 / 10 degrees; - it has, on each of its faces, a Cobb index between 20 g / m2 and 30 g / m2.

[0035] A laminated packaging material according to the invention can be obtained with an ins- online installation described below with reference to [Fig.2].

[0036] Three headboxes T1, T2, and T3 each contain paper pulp from which three layers are formed. These layers are then fed into a press 3, where they are bonded together to form the base board. These three layers of fibers are then fed into a press P, and subsequently into a dryer S, which laminates and dries the fiber layers to produce a fibrous mat (the base board).

[0037] After passing through a surface treatment station T, the base board is taken to a laminating station C in which a sheet of paper 11 according to the invention is unwound from an upper reel and another sheet of paper 11 is unwound from a lower reel, so that each face of the base board is coated with a sheet of paper 11.

[0038] The assembly thus obtained is brought into a second dryer S2, at the exit of which the product is wound onto a winder E.

[0039] The rolled laminated packaging material can then be cut into sheets or strips to make crossbars intended to form compartments, for example for bottles, once placed at the bottom of a cardboard box.

Claims

Demands

1. Laminated packaging material, comprising at least one base board (10) coated on at least one of its faces with an anti-abrasive coating, characterized in that the anti-abrasive coating is a sheet of paper (11) including a maximum of five mineral-type grains of diameter between 100 and 150 microns per square meter of paper, one face (110) of the sheet of paper being applied to the base board, the other face (111) of the sheet of paper being coated with a coating comprising a wax.

2. Laminated packaging material according to claim 1, characterized in that the coating represents between 6% and 7.5% by mass of the paper sheet (11) which otherwise comprises between 91% and 94% of a pulp of cellulosic fibres.

3. Laminated packaging material according to claim 2, characterized in that the paper sheet (11) comprises by mass: - 92.4% of a cellulose fibre pulp - 6.8% of coating - 0.8% of a cohesion-forming additive.

4. Laminated packaging material according to any one of the preceding claims, characterized in that the paper sheet (11) has a thickness of between 48 pm and 60 pm.

5. Laminated packaging material according to the preceding claim, characterized in that the paper sheet (11) has a thickness of 54 pm.

6. Laminated packaging material according to any one of the preceding claims, characterized in that the paper sheet (l 1) has a tensile strength of about 4 kN / m2 on its coated face.

7. Laminated packaging material according to any one of the preceding claims, characterized in that it comprises three layers of recycled or regenerated fibers bonded together to form the base board.

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