JPH10133585A - Information bulletin sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely fix a rear surface and to hold a bulletin paper, etc., by the magnetic attraction of small magnets to a front surface by elastically deforming the projecting parts and recessed parts of a sheet-like magnet having flexibility to generate a negative pressure in these recesses, thereby attracting the magnet to a surface to be held. SOLUTION: If the other surface of the sheet-like magnet 2 is provided with a layer to be printed, the printing and writing on the information bulletin sheet itself are possible. A material having flexibility and tacky adhesiveness when dry is applied on the surface of the projections 3 formed by embossing the sheet-like magnet surface having a specified thickness and the coating is dried, by which the tacky adhesive parts 5 are formed. The projections 3 and the recesses 4 may be disposed on the magnetic attraction surface of the sheet-like magnet and are more preferably disposed on the non-magnetic attraction surface. The one surface of the information bulletin sheet 1 is pressed to the holding surface of a nonmagnetic material, such as glass or resin, in contact therewith. When the depression is released, the bulletin sheet is surely attracted and fixed by the negative attraction by the recesses and tacky adhesive force and, therefore the holding of the bulletin paper, etc., by the small circular magnets, etc., is possible.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information bulletin sheet to be held by various articles for information bulletin or interior decoration.

[0002]

2. Description of the Related Art Conventionally, as a sheet-shaped magnet used as an information display sheet, an adhesive or a tape with an adhesive is laminated on the back side of the sheet-shaped magnet, and the adhesive layer is formed. There has been a sheet which is adhered to a mating surface to form a sheet-like magnet layer on which the display paper or the like is sandwiched by a small circular magnet or the like (for example, Japanese Utility Model Application Laid-Open No. 58-97134). But,
These adhesives have the drawback that, when repeatedly adhered, the adhesive strength of the pressure-sensitive adhesive decreases, and when the mating surface has poor smoothness or there is even a slight amount of water or oil film, the adhesive strength is extremely reduced.

[0003]

SUMMARY OF THE INVENTION The present invention is intended to solve the above-mentioned problem, that is, the mating surface is a non-magnetic material or a magnetic material, and some water or oil film is formed. Even if it arrives or the degree of smoothness is somewhat poor, the back surface of the sheet magnet is firmly fixed, and a bulletin board or the like can be sandwiched on the surface by the magnetic attraction of a small magnet, and it can be repeatedly fixed. It is another object of the present invention to provide an information bulletin sheet which does not decrease the suction power.

[0004]

SUMMARY OF THE INVENTION According to the present invention, an information posting sheet is surrounded on at least one surface of a flexible sheet-like magnet by continuous or discontinuous projections. The concave portion is formed so as to be elastically deformable, and at least the protrusion surface is used as an adhesive portion, and the concave portion opening and the protrusion surface are brought into contact with the held surface and pressed to release the pressing, thereby elastically deforming the protrusion and the concave portion. The above problem was solved by a configuration in which the inside of the concave portion was set to a negative pressure to attract the sheet magnet to the surface to be held.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, if a printed layer is formed on the other surface of a sheet-like magnet and subjected to easy printing, printing or writing can be performed on the information posting sheet itself. The protrusions and recesses according to the present invention can be made flexible by embossing a sheet-like magnet having a certain thickness as shown in FIGS. An adhesive part (for example, silicone rubber) may be applied and dried to form an adhesive part. Alternatively, as shown in FIG. 4, the substance may be applied to a fixed thickness magnet itself and dried to form a protrusion and an adhesive part. The coating is often performed by screen printing, XY plotter, or the like. Further, as the material forming the adhesive portion or the projection and the adhesive portion, silicon rubber, urethane rubber, elastomer, epoxy, vinyl chloride, acrylic, or the like can be used.

The projections and recesses may be provided on the magnetized surface of the sheet magnet. However, it is easier to use the posting surface as the magnetized surface, and at least the projecting portion and the concave portion are provided on the non-magnetized surface. It is more preferable to use a protrusion and a concave portion. Further, the protrusion and the concave portion may be provided on one or both surfaces by magnetizing both surfaces. In this case, the bulletin board or the like can be sandwiched by an iron piece instead of a small magnet.
Thick magsheets can be used, but the thickness is 0.5
When the thickness is less than mm, the elastic deformation is liable to occur, so that a synergistic effect of the negative pressure attracting force and the magnetic force attracting force works, so that a thin magnet having a weak magnetic force can be more preferably used.

As the sheet magnet used in the present invention, all magnets obtained by dispersing magnetic particles in a flexible substance such as plastic or rubber can be used. However, barium ferrite or strontium ferrite in a thermoplastic resin can be used. It is possible to use a fermented powder obtained by dispersing a ferromagnetic powder in a sheet form.

The planar shape of the projection according to the present invention may be a pattern consisting of a straight line connecting a circle and a circle vertically and horizontally, a pattern having only a circle, a combination pattern of a circle and a center projection, and a square continuous pattern. , A continuous pattern of hexagons, a combination pattern of concentric circles and radiation traversing it, and the like.

The printing layer used in the present invention can sufficiently cover a sheet-like magnet having a dark color, and
It is preferable that the thickness is as thin as possible.For example, if an opaque layer formed by vacuum-depositing aluminum or the like is provided, the color of the deposited metal can be used as a base color, or even if an opaque synthetic resin film that is entirely colored is used, Good. The layer to be printed may be laminated on the sheet magnet by a normal laminating method. In addition to laminating using a bonding agent such as an adhesive or an adhesive, depending on the material of both layers, laminating directly is performed only by heat and pressure bonding. You can also.

When the information bulletin sheet of the present invention comes in contact with one surface thereof and presses it against a holding surface of a non-magnetic material such as glass or resin and releases the pressure, the concave portion is positively attracted by the negative pressure and the adhesive force of the adhesive. Since the sheet is adsorbed and fixed, the bulletin board or the like can be held by the small circular magnet or the like as described above. Also, when the magnetic material such as a steel cabinet is brought into contact with the surface to be held and pressed and released, the magnetic attraction by the magnet is further applied to increase the attraction force, and the mating surface of the cabinet or the like is somewhat uneven or slightly uneven. Even if rust, water, oil, etc. are attached, it can be firmly absorbed and fixed.

A bulletin board or the like is applied to the outer surface of the information bulletin sheet thus attracted and fixed, and the bulletin board or the like can be held by magnetically attracting the bulletin board with a small circular magnet or iron piece from above.
Moreover, even if it is repeatedly peeled off or adsorbed, the adsorbing power does not decrease. Here, the negative pressure suction by the concave portion will be described with reference to FIG. When the information bulletin sheet is pressed against the held surface in the direction of the arrow, the adhesive portion on the surface of the projection strongly presses against the held surface, elastically deforming the projection and elastically deforming the bottom of the recess, thereby forming the recess. The interior volume is reduced to create a closed room. Next, when the pressing is released in that state, the protrusion and the concave portion try to return to the original state by elasticity. However, since the inside of the concave portion is in a closed chamber state, it can be estimated that the suction pressure is further increased by applying a negative pressure to the inside of the concave portion.

[0012]

Next, the information bulletin sheet of the present invention will be clarified by Examples and Comparative Examples shown in Table 1. FIG. 1 is a cross-sectional view showing one embodiment of the present invention, FIG. 2 is a cross-sectional view showing the suction action of a concave portion of the embodiment, FIGS. 3 and 4 are cross-sectional views showing another embodiment, FIGS. 1 is a perspective view showing a use state of an embodiment of the present invention, wherein 1 is an information bulletin sheet, and 2 is a sheet.
A magnet 3, a projection 4, a recess 4 surrounded by the projection 3, a flexible adhesive portion 5 applied to the surface of the projection 3, and a printed layer 6.

Example 1 88 parts by weight of barium ferrite magnetic powder and 12 parts by weight of a chlorinated polyethylene resin were used.
The mixture was mixed by a roll and rolled to form a flexible sheet-like magnet having a thickness of 0.4 mm. An adhesive is applied to the back surface of this flexible sheet, and a white polyester film or vinyl chloride film having a thickness of 0.1 mm is laminated thereon, and the back surface of the sheet is multipolar magnetized. Thus, a sheet having the layer 6 to be printed was obtained. The sheet was applied to a printer to obtain a good print on the print-receiving layer 6.

The front side (non-magnetized surface) of this sheet is embossed, and circular mountain-shaped protrusions 3 having a cross-sectional outer diameter of 7 mm as shown in FIG. 1 are arranged at a pitch of 7 mm in length and width. Each circular chevron projection 3 was formed by connecting with a linear projection 3 having a line width of 1 mm. Further, silicone rubber was applied to the surface of the projection 3 at a thickness of 0.1 mm and dried to obtain an information bulletin sheet 1 as a flexible adhesive portion 5. The magnetic flux density of the information bulletin sheet 1 was 280G.

When the surface of the information posting sheet 1 is brought into contact with the glass surface 7 which is the held surface and the side surface 8 of the cabinet to which a little water adheres and is pressed and released, the information posting sheet is released.
In the test 1, the magnetized surface (printed surface) was positioned outside, and was surely attracted.
Moreover, even if it was repeatedly peeled off or adsorbed, the adsorbing power did not decrease. It should be noted that the information posting sheet 1 is not printed on the print-receiving layer 6 but is left on a white background, and
The same applies to the case where the bulletin paper 9 is applied to the outer magnetized surface (printing surface), and magnetically attracted by a small circular color magnet 10 or the like from above, and the bulletin paper 9 is pinched. did. Alternatively, the user may directly write on the print-receiving layer 6 with a pen or the like.

The information bulletin sheet 1 was formed into a 50.times.100 mm square piece, the end of which was held by a clamp jig, which was pulled with a spring to measure the maximum static friction force in the tangential direction. Table 1 shows the results.

[0017]

[Table 1]

(Embodiment 2) The same information bulletin board as in Embodiment 1 except that the thickness of the sheet magnet is changed to 0.8 mm.
And the same measurements were made. The results are shown in Table 1.

(Examples 3 and 4) The same thicknesses as in Examples 1 and 2 of 0.4 mm and 0.8 m, except that embossing and application of silicone rubber were performed on the magnetized surface of the sheet magnet.
An m information bulletin sheet 1 was prepared and the same measurements were made. The results are shown in Table 1.

(Examples 5 and 6) Examples 1 and 6 were repeated except that silicon rubber was directly applied to the non-magnetized surface without embossing.
0.4mm and 0.8mm thickness information bulletin sheet same as 2
And the same measurements were made. The results are shown in Table 1.

(Examples 7 and 8) Examples 1 and 2 were repeated except that silicon rubber was directly applied to the magnetized surface without embossing.
An information bulletin sheet 1 having the same thickness of 0.4 mm and 0.8 mm was prepared, and the same measurement was performed. The results are shown in Table 1.

(Comparative Examples 1 and 2) (Comparative Example) A flat information posting sheet without embossing or silicone rubber coating on a sheet-like magnet, and thus without forming any protrusions and recesses is used. The measurement was performed and the results are shown in Table 1. As shown in Table 1, the sheet-shaped magnets formed with protrusions and recesses by embossing or applying silicone rubber all have a large maximum static frictional force, and can reliably hold the sheet. In particular, the effect is remarkable in a thin one having a thickness of 0.4 mm.

[0023]

The information bulletin sheet of the present invention can be used even if the mating surface is a non-magnetic material, or even if some water or oil film is attached or the smoothness is somewhat poor. The back surface of the g-shaped magnet can be securely fixed, and the display paper or the like can be sandwiched by the magnetic attraction of a small magnet or the like on the surface, and the attraction force does not decrease even when repeatedly fixed.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing an adsorption action of the embodiment.

FIG. 3 is a sectional view showing another embodiment of the present invention.

FIG. 4 is a sectional view showing another embodiment of the present invention.

FIG. 5 is a perspective view showing a use state of the present invention.

FIG. 6 is a perspective view showing a use state of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Information bulletin sheet 2 Sheet magnet 3 Projection 4 Depression 5 Adhesive part 6 Printed layer 7 Holding surface

Claims (3)

[Claims] A continuous or discontinuous projection and a recess surrounded by the projection are formed on at least one surface of a flexible sheet-like magnet so as to be elastically deformable. The surface of the recess is used as an adhesive portion, the opening of the recess and the surface of the projection are brought into contact with the surface to be held and pressed to release the pressure. An information bulletin sheet characterized by adsorbing a toroidal magnet on a surface to be held. 2. The information bulletin sheet according to claim 1, wherein said sheet-like magnet has a layer to be printed laminated on the other side. 3. The information bulletin sheet according to claim 1, wherein at least one of the projecting portion and the concave portion of the sheet-like magnet is integrally formed by embossing.