FR2878266A3 - Paper suitable for magnetic attraction incorporates painted surface containing magnetically attractive element - Google Patents

Abstract

The paper consists of a paper substrate (1) with at least one coat of an interface paint (2) on one surface, and at least one coat of a paint (3) that can be magnetically attracted on the outer surface of the interface paint. The magnetically attractive paint contains at least one element selected from the following: barium, strontium, rubidium, cobalt and boron, or a ferrous material that can be magnetised after application. It can also be doped with a spreading agent with anti-foaming, anti-sedimentation, gelatinisation or moistening properties.

Description

2878266 PAPER STRUCTURE THAT CAN BE MAGNETICALLY ATTRACTED

  The present invention relates to a paper structure that can be magnetically attracted, and more particularly to a paper structure that can be magnetically attracted that is flexible, lightweight and thin.

  It is common to note that a magnet is attracted by a surface made of iron. For example, a magnet may be drawn to a white board or refrigerator liner to fix a note or mark a position. The magnet may be a body constituting a block or a body constituting a plate having a certain thickness. This magnet is not flexible so that the application of the magnet is quite limited.

  FIG. 1 shows a magnetic structure comprising an element 10 and a magnetic sheet 30 bonded to one face of the element 10. The element 10 can be rigid or flexible and constituted in a predetermined form. The magnetic sheet may consist essentially of barium, strontium, rubidium, cobalt or boron. The magnetic sheet 30 is magnetically and magnetized, so that the substrate 10 has a magnetic attraction force.

  A conventional paper sheet generally has a small thickness, good flexibility, as well as a high capacity for moisture absorption and breakage. In the case where a magnetic sheet 30 is directly glued or placed on the surface of the paper sheet, the thickness and flexibility of the paper sheet is greatly affected. This therefore limits the application of the sheet of paper.

  Furthermore, it is known that a sheet of paper quickly absorbs a liquid present in its fibers, which causes said paper to wavy. In the case where a magnetic solution is applied to the surface of the paper, the solvent of the solution is fully absorbed in the paper. Therefore, even in a dry state, the magnetic material can hardly be fully connected to the paper surface. As a result, the magnetic material tends to become detached from the paper.

  In addition, a magnetic material may be added to a texture so that the texture is directly absorbed in a magnetically attractable material (magnetic powder or ferrous material powder) coated with a wetting agent. Once the magnetically attractable material has infiltrated into the texture fibers, the texture is rolled up to remove the excess magnetically attractable material and then compressed into a thin sheet. The thin sheet is then magnetized as necessary to form a product whose texture can be magnetically attracted. However, this approach does not apply to paper materials with a high water absorption capacity.

  It is an object of the present invention to overcome these disadvantages by providing a magnetically attractable paper structure comprising a paper substrate.

  More specifically, the present invention provides a magnetically attractable paper structure comprising: - a paper substrate, - at least one interface paint layer disposed on at least one surface of the paper substrate, and - at least one a magnetically attractable paint layer of a magnetically attractable material painted on an outer face of the interface paint layer.

  Thus, the interface paint layer serves as a protective film to reduce the solvent absorption capacity of the paper substrate. As a result, the paint layer of the magnetically attractable material can be more easily and securely bonded to the paper substrate. In addition, the interface paint layer also serves to improve the strength of the paper substrate and to prevent the paper substrate from waving.

  Advantageously, the material that can be magnetically attracted consists of at least one element chosen from barium, strontium, rubidium, cobalt and boron, the layer of paint that can be magnetically attracted is magnetically ordered and magnetized. to have magnetic attraction after being deposited on the paper substrate.

  Thus, the paper has a very thin and flexible.

  Preferably, the magnetically attractable material is ferrous material which can be magnetically attracted.

  In another aspect of the present invention, the magnetically attractable paint layer is formed of a magnetically attractable material doped with a spreading agent.

  Preferably, the interface paint layer is made of an impermeable material such as a PVA, UV-resistant or polymolecular paint, which is applied to the surface of the paper substrate.

  Advantageously, the spreading agent consists of at least one agent selected from an antifoaming agent, an anti-sedimentation agent, a gelatinizing agent, a wetting agent and a coloring agent.

  Other features, details and advantages of the invention will emerge on reading the description made with reference to the accompanying drawings given by way of example, which respectively represent: FIG. 1, a sectional view of a conventional magnetic sheet Fig. 2 is a perspective view of a magnetically attractable paper according to the present invention, and Fig. 2-1 is a sectional view of the magnetically attractable paper according to the present invention.

  Referring to Fig. 2, the present invention comprises a paper substrate 1, an interfacial paint layer 2, and a paint layer of magnetically attractable material 3 (e.g., a magnetic powder solution or a solution of ferrous material). The interface paint layer 2 is an impermeable material such as a PVA paint, UV resistant or polymolecular.

  The interface paint 2 is disposed on at least one surface of the paper substrate 1 by means of a paint application, a coating or a roller pressure to reduce the moisture absorption capacity. of the paper substrate 1 and to improve the resistance thereof.

  The magnetically attractable paint is made of a magnetic material such as barium, strontium, rubidium, cobalt or boron or a ferrous material coated with a spreading agent (such as an anti-corrosive agent). foam, an anti-settling agent, a gelatinizing agent, a wetting agent or a coloring agent).

  The magnetically attractable paint is applied to the surface of the interface paint layer 2 to form the paint layer of magnetically attractable material 3.

  The paint layer spreader of magnetically attractable material 3 is not absorbed by the paper substrate 1, so that the paint layer of the magnetically attractable material 3 can be more easily and more easily absorbed. securely bonded to the paper substrate 1. In addition, the paper substrate 1 does not flake.

  Depending on the characteristics of the material and as desired, the magnetically attractable material paint layer 3 is magnetically ordered and magnetized to possess magnetic attraction. Thus, the design of the paper that can be magnetically attracted is complete.

  In the aforementioned structure, the paper substrate 1 itself is light and thin and the layer of material paint which can be magnetically attracted to the outer surface of the substrate paper 1 is very thin. As a result, the material consumption is reduced and the paper product has its initial flexibility and can be easily rolled up, folded and cut into a desired shape. In addition, the surface of the paper product can be printed with desired images and characters. The application of the paper product is expanded.

  It should be understood, however, that these examples are given solely by way of illustration of the subject of the invention, of which they in no way constitute a limitation.

Claims (6)

  A paper structure that can be magnetically attracted characterized in that it comprises: - a paper substrate (1); at least one interface paint layer (2) disposed on at least one surface of the paper substrate (1); and at least one magnetically attractable paint layer (3) of a magnetically attractable material painted on an outer face of the interface paint layer (2).   A magnetically attractable paper structure according to claim 1, characterized in that the magnetically attractable material is at least one member selected from barium, strontium, rubidium, cobalt and boron, after have been deposited on the paper substrate (1), the magnetically attractable layer of paint (3) being magnetically ordered and magnetized to possess a magnetic attraction.   A magnetically attractable paper structure according to claim 1, characterized in that the magnetically attractable material is magnetically attractable ferrous material.   A magnetically attractable paper structure according to claim 1, 2 or 3, characterized in that the magnetically attractable paint layer (3) is formed of a magnetically attractable material doped with a spreading agent. .   A magnetically attractable paper structure according to any one of the preceding claims, characterized in that the interface paint layer (2) is made of an impermeable material such as a UV-resistant PVA paint. or polymolecular, which is applied to the surface of the paper substrate (1).   A magnetically attractable paper structure according to claim 4 or 5, characterized in that the spreading agent is at least one agent selected from an antifoaming agent, an anti-sedimentation agent, a gelatinizing agent. , a wetting agent and a coloring agent.