DE10237228A1 - Paper web for printing advertising panels has top surface of paper or plastic over a paste layer containing magnetic particles - Google Patents

Abstract

A web of material (1) has a top layer of paper or plastic (3) on a base layer of paste material containing magnetic particles over an anti-slip layer (4). The web provides a surface on which images or legends are printed by a plotter, copying machine, printing machine or similar. The web is preferably 600 mm wide or more. The upper layer is 0.1-0.2 mm thick.

Description

general Background Art Field of the Invention

The present invention relates to a magnetic sheet or a magnetically adhesive strip Sheet or a magnetically adhering billboard for display purposes and a process for its manufacture. The magnetic sheet can be magnetically attached to a magnetic surface attached, on which the printing of desired letters, drawings, Painting, Photographs etc. using a printing machine such as a plotter, a copier, a laser printer, an inkjet printer, one Allow thermal printer with ribbon and a matrix printer and effective for producing a large-area display element such as an advertising poster can be used.

State of the art

The display devices available so far use magnetic sheets, which, due to their properties, can be magnetically removed from any surface have it attached as far as this surface becomes a magnetic element heard or magnetically attracts the magnetic sheet. In doing so, these display articles including silk printing, which can be printed on one on one Magnetic sheet applied white Vinyl chloride surface is used, whereby for each color needs a plate will or by provisional Production of a display sheet produced by printing with a printer and subsequent Applying the display sheet to a magnetic sheet is produced. The display devices are accordingly expensive and their type and display contents are inevitably specified precisely. Under these circumstances, generally in homes and offices, can be combined in one if desired shop only purchase an existing magnetic sheet for display purposes Display content was previously made by printing. So must on a magnetic sheet for Display purposes with the desired ones Ad content is waived if it is not available in any store.

5 shows a method according to the prior art for producing a magnetic sheet for display purposes. As shown, a mixed paste 101 rolled from plastic material and magnetic particles by going through so many calender roll stages 102 is guided until its thickness on a paste sheet 103 has been reduced with the desired final strength. Then a printed sheet consisting of paper or plastic film is laminated onto the paste sheet. The laminate thus produced is then subjected to a magnetization process with the aid of a magnetization yoke. In this way, the above-mentioned magnetic sheet is produced for display purposes.

A process in which the paste is guided through several calender roller stages with one calender machine, however brings restrictions in terms of latitude and longitude of the magnetic sheet for Display purposes with itself. Typically, the width is determined by the Roll width determined. About that addition is the percentage by weight of the magnetic particles in the paste sheet that is made up Plastic material and magnetic particles are made up of 90% or more. In comparison with pure plastic material, these are specific Weight is high and viscosity is low. That's why the paste sheet brittle and is prone to breakage and pitting. Basically, achieve a paste sheet only up to A4 or A3 size, and it is heavy, a magnetic sheet for display purposes to get the wide, long, for printing using a copier, printer, or the like Printing machine is suitable and excellent magnetization performance having. The uses of the paste sheet are therefore limited, and it has not been possible until now great Display element, such as. B. to produce a wide and long advertising poster.

In the known method of sheet production using calender rolls inevitably requires a complicated device can be used because the paste is made of plastic material and magnetic particles is passed through a series of calender roll stages to gradually increase the desired Strength to achieve. About that out is not a big one dimensional stability expected and the thickness accuracy of the sheet that is manufactured can be amounts to at best about 0.1 mm. It is therefore impossible to have a wide and long, i.e. large-scale, Magnetic sheet for Display purposes of constant thickness in a range of thicknesses from 0.1 to 0.2 mm without the possibility breakage and hole formation and, as indicated above the attainable sheet size is at best the format A4 to A3.

The present invention lies consequently based on the technical problem, a freely configurable, inexpensive Specify magnetic sheet of any size and an associated manufacturing process.

This task is due to the characteristics the independent Expectations 1 and 2 solved, being the claims 3 to 5 relate to advantageous designs.

As a step to fundamentally eliminate the above disadvantages, a magnetic sheet for display purposes was developed according to the invention, which can be printed on by a printer, such as a copier. For this purpose, a printing sheet made of paper, for example high-quality paper, coated paper, etc., synthetic paper or plastic film with a thickness of 0.05 to 0.15 mm is applied to a surface of a magnetic sheet. The magnetic bow consists of a mixture of plastic material and magnetic particles, so that a kind of bow ent stands, which has a thickness of 0.05 to 0.15 mm and the other surface is magnetized multi-pole alternately to the N and S poles, so that the magnetic sheet for display purposes (including printed sheet) a total thickness of 0.15 to Reached 0.3 mm.

This magnetic sheet for display purposes allowed instead of buying an existing magnetic sheet for display purposes the quick and easy display of the desired display content with With the help of a copier, a printer or a similar printing machine, as usual at home or in the office is used. The printed magnetic sheet can be used for display purposes removable on the magnetic surface of a steel plate, a white board etc. can be magnetized.

Summary the invention

As stated, the object of the invention is to provide it a magnetic sheet for Display purposes which, although it is wider and longer than the A4 format A3 is a consistent desired Thickness without breaking or pitting has, with the aid of a plotter, a copier or the like Printing machine can be easily printed, excellent magnetization properties owns and produces a magnetically adhesive large advertising poster allows like it could not be produced before.

To accomplish this task developed an epoch-making process in which a paste sheet made of magnetic particles and plastic material with a predetermined desired Width and the desired Thickness approximating thickness is produced without relying on a rolling system to fall back on with multiple roller stages, but by the paste sheet using an extrusion process is made quickly and easily while using the thickness in the next step Adjusting rollers to the desired one Value is brought. This makes it quick and easy a magnetic sheet for Achieve display purposes easily using a copier, one Printer or the like Printing machine can be printed and excellent magnetic Has adhesive properties.

Summary of the drawings

1 is a sectional view of a magnetic sheet according to the invention for display purposes;

2 is a schematic diagram for describing a method for producing a magnetic sheet according to the invention for display purposes;

3 is an illustration of an extrusion machine, such as is used for the production of magnetic sheets according to the invention for display purposes;

4 is a representation for describing adjusting rollers, as they are used in the method for producing magnetic sheets according to the invention for display purposes and

5 Fig. 11 is an illustration for describing a prior art manufacturing method based on calender rolls.

detailed Description of the preferred embodiments

1 shows a first embodiment of the magnetic sheet according to the invention for display purposes. In the figure, the reference number denotes 1 a magnetic sheet for display purposes with a width of approx. 600 mm or more and a length of your choice. Of course, other widths are also conceivable and are included. reference count 2 denotes a magnetic sheet or paste sheet which is formed by producing a sheet-like or sheet-like or strip-like mixture with a thickness of approx. 0.1 to 0.2 mm from a plastic material and magnetic particles and at least one surface optionally as N or S -Pole is magnetized. reference count 3 is a printing sheet or printing strip, which consists for example of paper, e.g. B. high quality paper, coated paper, etc., synthetic paper or a synthetic resin film of about 0.1 to 0.2 mm thickness and on a surface of the magnetic sheet 2 is laminated.

The reference number 4 denotes an anti-slip material with which a surface of the magnetic sheet 2 is coated. With one application of the magnetic arc 1 for display purposes, a desired display such as a painting, letters, drawings, photographs, etc. is printed on the surface of the print sheet using a plotter, copier, printer or similar printing machine 3 printed, the printed magnetic sheet magnetically adheres to a display device which has a magnetic body, so that a large-sized display element, such as. B. an advertising poster.

The following is a method of making the magnetic sheet 1 described for display purposes. How 2 shows a plastic material and magnetic particles in a funnel 6 an extrusion machine 5 given. It applies to the mixing ratio between the plastic material and the magnetic particles that the magnetic adhesive effect is insufficient if there are insufficient magnetic particles. If, on the other hand, there are too many magnetic particles, the plastic material used as a binder is sufficient to form the paste sheet 2 not from.

In the exemplary embodiment, the weight fraction of the magnetic particles in the paste is set at approximately 85 to 95%. The plastic material and the magnetic particles in the funnel 6 are in an extrusion press 7 with an internal screw 7a filled where they melted thermally, kneaded and ge presses and then extruded into a nozzle 8th with a wide outlet opening 8a (Width approx. 600 to 1000 mm). The exit opening 8a has a width corresponding to the desired width of the paste sheet 2 for display purposes and a thickness that corresponds to the desired thickness of the magnetic sheet or paste sheet 2 for display purposes.

How 3 shows the nozzle 8th a cavity shaped like a hanger, the width of which suddenly or quickly increases when you step away from the inlet opening of the extruder 7 in the direction of the paste feed to the outlet opening 8a emotional. A heavy, highly viscous paste made of melted plastic material and magnetic particles can evenly flow to the wide outlet opening 8a to get promoted. In this way, a paste sheet can be made without irregularities and largely with the desired thickness 2 respectively. 9 Extrude in the desired width and of uniform thickness (e.g. 0.2 to 0.5 mm).

The nozzle shape mentioned above maintains the mechanical strength of the nozzle 8th and also leads the paste evenly to the outlet opening. The paste, consisting of the melted plastic material and magnetic particles, has a high proportion of magnetic particles, and its specific weight is very high in comparison with pure plastic material. Therefore the nozzle 8th can be broken (or opened in the case of an upper punch) by the great force exerted by the pressed paste. To eliminate this problem, you need the top and bottom halves of the nozzle 8th be secured on the widest possible area with strong stud screws and the area of the cavity on which no stud screw can be used must be as small as possible. If the nozzle 8th As described above, a shape which is essentially reminiscent of a hanger is given, it can be made shorter, so that a nozzle can be provided which can withstand high pressure in a suitable form.

How 4 shows, the paste sheet 2 respectively. 9 , which has been given the desired width and a constant thickness close to the desired value by extrusion, between two rolls 11 . 12 performed as adjustment rolls 10 near the exit opening 8a the nozzle 8th are attached and rolled when pulled out. This creates a thin sheet with a desired thickness of approx. 0.1 to 0.2 mm.

A feature of the exemplary embodiment is that in the calender rolls according to the prior art, the two opposite rolls are both driven by the sheet running between them, while by the adjusting rolls 10 in the embodiment according to the invention only those in 4 shown lower roller 11 a driven roller 11 for transporting the paste sheet 9 is, whereas the top roller 12 opposite the driven roller 11 a free roller 12 is that does not perform a driven rotary movement, but is rotated by a driving force that is caused by the progressively solid paste sheet 9 is transmitted.

Become both opposing rollers 11 . 12 driven, the following problems arise. The first problem is that the rolled sheet can be stressed and deformed because it adheres not only to the lower but also to the upper roller. Another problem is that between the two rollers 11 . 12 inserted sheet, if it has small irregularities in thickness, is inserted into the rollers with extremely compressed points and is pulled out of these.

Therefore take the thicker parts of the bow, the stronger have been pressed together than the rest of the parts, after issue the arch back to its original Condition. The thickness irregularities are therefore not eliminated.

In contrast, the adjustment rollers 10 of the embodiment of the invention, the free roller 12 no own drive. The retracted sheet does not stick to it, but is always guided downward along the driven roller 11, so that a constant quality is achieved. The free roller 12 does not overly compress the unevenly thick sheet. Rather, the free roller works 12 braking of the sheet so that thicker sheet parts are in front of the roll areas that are just before the forced contact or the roll gap. In this way, the thickness irregularities of the sheet and the thickness of the paste sheet are eliminated 9 is evenly adjusted to a desired thickness of approx. 0.1 to 0.2 mm, which means the gap or roll gap between the driven roll 11 and the free roller 12 corresponds to that like the adjusting rollers 10 are set.

The one between the adjusting rollers 10 protruding paste sheets 9 is still hot and easily deformable. Accordingly, it is located directly under the adjustment rollers 10 a chill roll 13 to cool down the paste sheet 9 with suitable means such as air cooling or water cooling to a temperature close to normal temperature (see 2 ). The cooled paste sheet 9 is printed on a synthetic resin sheet 3 laminated and then with laminating rollers 14 glue applied. The reference number 15 denotes a roller coater for evenly applying the adhesive to a surface of the printing sheet 3 , namely the one that the paste sheet 9 is facing.

For the press sheet 3 is properly paper in sheets of cellulose fibers, glossy paper or coated paper made by surface treatment of the paper sheets, synthetic Pa pier from a thin plastic film, which was obtained by adding "White Earth" to plastic material or producing porous material, plastic film etc. The printing technology used, the intended use, the costs, etc. are taken into account in this case , high quality paper for copier printing and coated paper as well as art paper for printing with an inkjet printer or the like.

The paste sheet 9 with the laminated printed sheet 3 after the described union in the next step of a multi-pole magnetization in a magnetization device 16 on one surface (or both surfaces) of the magnetic sheet 2 subjected, alternately as N and S pole. The magnetic bow 2 is magnetized with a magnetizing force that is ten times or more the weight of the magnetic arc 1 matters for display purposes. Thus the magnetic sheet sticks 1 for display purposes reliably magnetic even on a vertical magnetic surface without being able to fall off.

The next step is an anti-slip material 4 which is a sticking of the magnetic sheet 2 with the magnetically adhesive surface should prevent, with a coating machine 17 applied to the magnetic adhesive surface in a thickness of approx. several μm and with a dryer 18 dried. A large-format magnetic sheet for display purposes is produced with a thickness of approx. 0.2 mm, a width of approx. 600 to 1000 mm and a length that can be set as desired. This magnetic bow 1 comes as a sheet roll of appropriate length or after cutting with the help of a divider 19 and / or a cutting machine 20 on the market in suitable formats. The product provided in this way is used by a desired motif, e.g. B. a painting, letters, drawings and photographs, with a plotter, a copier, a printer or a similar printing machine on the surface of the sheet 3 is printed.

In another example of the above adjustment rollers 10 is the bottom roller 11 a main drive roller and the top roller 12 a power take-off roller which is driven at a lower rotational speed than that of the main drive roller. In this case too, the power take-off roller shows essentially the same function and the same effects as the non-driven free roller 12 in the above embodiment. In particular, it is not possible for the protruding paste sheet 2 respectively. 9 adheres to the power take-off roller and unevenly thick parts of the paste sheet 2 or 9 are braked. In this way, an even paste sheet 2 respectively. 9 be produced without thickness irregularities.

In the above embodiment, the printing sheet 3 on a surface of the magnetic sheet or paste sheet 2 laminated. However, even if not shown, spreadsheets are also possible 3 on both surfaces of the magnetic sheet 2 laminate.

As described above, the magnetic arc 1 made for display purposes according to the invention by a press sheet 3 made of paper or plastic film with a width of approx. 600 mm or more, a length to be defined as desired and a thickness of approx. 0.1 to 0.2 mm on one surface or both surfaces of a paste sheet 2 is laminated on, which can be magnetically attached to a magnetic surface and allows the production of a large-sized display article, such as. B. a wide and long advertising poster, which can be easily printed and has an excellent magnetic adhesiveness, by displaying on the sheet surface of the magnetic sheet using a plotter, a copier, a printer or a similar printing machine such. B. a painting, letters, drawings and photographs is printed.

As for the method of making the magnetic sheet 1 For display purposes according to the invention, a method has been devised to insert a plastic material and magnetic particles into an extruder of an extrusion press 5 to fill, knead it in, the paste thus formed in a nozzle 8th to give up in the extrusion press 5 and a wide outlet opening 8a has a thin, foil-like paste sheet 2 respectively. 9 the plastic material and the magnetic particles in the desired width and with a thickness close to the desired thickness from the nozzle 8th to win this paste sheet 2 respectively. 9 between two adjustment rollers arranged as the next stage 10 let pass through, so that a thin, sheet-like sheet with the desired thickness is created, followed by a printed sheet in the next step 3 from paper or plastic film, on which a painting, letters, drawings, photographs etc. can be printed with a plotter, a copier, a printer or a similar printing machine, on the paste sheet 2 respectively. 9 laminated and the paste sheet 2 respectively. 9 is magnetized in the subsequent step.

This eliminates all of the disadvantages associated with the prior art calender machine that can cause breakage or pitting in a wide and long sheet, making it inevitable that the sheet size of the product be A4 to A3 to limit. Only the invention enables the production of a thin, wide and long sheet of a magnetic particle / synthetic resin mixture of uniform thickness. Thus, a previously unavailable large format magnetic sheet for display purposes can be produced, which enables simple printing and an excellent magnetic Has adherence.

It should be emphasized here that the epoch-making invention made a paste sheet quickly and easily 2 respectively. 9 which has a predetermined desired width and a thickness close to the desired thickness, not in a multiple rolling system, but by using an extrusion machine and at the next stage by making a paste sheet 2 respectively. 9 the desired thickness using adjustment rollers 10 , offers the ability to quickly and easily obtain a thin and large magnetic sheet for display purposes, which can be easily printed on with a copier, printer or similar printing machine and which also has excellent magnetic adhesion. This means that large-format advertising posters with excellent advertising impact can be efficiently produced for advertising purposes.

The adjustment rollers 10 for the production of the paste sheet 2 or 9 in the desired thickness consist of an exaggerated roller 11 rotating the paste sheet 2 respectively. 9 made of synthetic plastic material and magnetic particles and a free roller 12 opposite the driven roller 11 that not by self-rotation, but only by the paste sheet transported by 2 respectively. 9 transmitted driving force is driven. Thus there is no possibility that the on the driven roller 11 adhesive paste sheets guided by it 2 respectively. 9 because of sticking to the free roller 12 can be stressed and deformed. In addition, the paste sheet 2 respectively. 9 not output unevenly from the thickness control rollers, but can always be precisely controlled in thickness by a step in which it is braked.

The one for making the paste sheet 2 respectively. 9 in the desired thickness serving adjustment rollers 10 can also from a main drive roller that rotates itself around the paste sheet 2 respectively. 9 Transport from plastic material and magnetic particles and consist of a secondary drive roller opposite the main drive roller, which rotates at a lower rotational speed than the rotational speed of the main drive roller itself. It is therefore not possible for the paste sheet sticking to and guided by the driven main drive roller 2 respectively. 9 is stressed and deformed due to sticking to the power take-off roller. In addition, the paste sheet is not discharged unevenly from the power take-off roller, but can always be precisely controlled in its thickness by a step in which it is braked.

It also has the nozzle 8th the extrusion machine 5 essentially the shape of a hanger, so that its width from the entry opening towards the exit opening 8a is increasing rapidly. Thus, the paste can flow evenly to the wide outlet 8a be guided while reducing the length of the cavity to the mechanical strength of the nozzle 8th to obtain.

Claims (12)

Magnetic sheet ( 1 ) for display purposes, consisting essentially of a paste sheet ( 2 respectively. 9 ) with a specified width and a length and thickness that can be set as desired, and a printed sheet made of paper or a plastic film, the paste sheet ( 2 respectively. 9 ) and thus the magnetic sheet ( 1 ) can magnetically adhere to a magnetic surface, and wherein the printed sheet of paper or the plastic film on one surface or both surfaces of the paste sheet ( 2 respectively. 9 ) is laminated on and has a representation applied with the aid of a printing press. Magnetic sheet ( 1 ) according to claim 1, characterized in that the paste sheet ( 2 respectively. 9 ) is formed as an extrudate from melted plastic material with embedded magnetic particles. Magnetic sheet ( 1 ) according to claim 1 or 2, characterized in that it has a width of about 600 mm or more. Magnetic sheet ( 1 ) according to one of claims 1 to 3, characterized in that the printed sheet ( 3 ) has a thickness of approx. 0.05 to 0.15 mm. Magnetic sheet ( 1 ) according to one of claims 1 to 4, characterized in that the paste sheet ( 2 respectively. 9 ) has a thickness of approximately 0.05 mm to 0.15 mm. Magnetic sheet ( 1 ) according to one of claims 1 to 5, characterized in that it has a total thickness of about 0.1 to 0.3 mm. Method of making a magnetic sheet ( 1 ) for display purposes, with the following steps: 7.1.) a plastic material together with magnetic particles is extruded using an extrusion machine ( 5 ) into a thin, foil-like paste sheet ( 2 respectively. 9 ) extruded from the plastic material and the magnetic particles; 7.2) the extruded paste sheet ( 2 respectively. 9 ) has a thickness that comes close to and slightly exceeds the desired thickness; 7.3) the extruded paste sheet ( 2 respectively. 9 ) is used as an adjustment roller between two ( 10 ) trained rollers ( 11 . 12 ) into a thin, foil-like paste sheet ( 2 or 9) rolled in the desired thickness; 7.4) a printed sheet ( 3 ) made of paper or a plastic film is placed on the paste sheet ( 2 respectively. 9 ) lami ned; 7.5) the paste sheet ( 2 respectively. 9 ) is magnetized. A method according to claim 7, characterized in that the plastic material with the magnetic particle in the extruder is kneaded and melted together and the extrusion machine ( 5 ) through a nozzle provided next to the extruder ( 8th ) with a wide outlet opening ( 8a ) is extruded. A method according to claim 7 or 8, characterized in that on the printed sheet ( 3 ) a painting, letters, drawings, photographs etc. are printed with the help of a printing machine, a plotter and / or a copier. Method according to one of claims 7 to 9, characterized in that the adjusting rollers ( 10 ) for the production of the paste sheet ( 2 respectively. 9 ) a drive roller in the desired thickness ( 11 ) and a free roller ( 12 ) compared to the driven roller ( 11 ), the drive roller ( 11 ) itself turns around the paste sheet ( 2 respectively. 9 ) made of plastic material and magnetic particles, and the free roller ( 12 ) cannot rotate itself, but is only rotated by a driving force which is caused by the transported paste sheet ( 2 respectively. 9 ) is transmitted. Method according to one of claims 7 to 10, characterized in that the adjusting rollers ( 10 ) for the production of the paste sheet ( 2 respectively. 9 ) consist of a main drive roller and a secondary drive roller opposite the main drive roller, the main drive roller rotating itself around the paste sheet ( 2 respectively. 9 ) to transport plastic material and magnetic particles and the auxiliary drive roller rotates at a lower rotational speed than the rotational speed of the main drive roller itself. Method according to one of claims 7 to 11, characterized in that the nozzle ( 8th ) the extrusion machine ( 5 ) essentially has the shape of a clothes hanger and is rapidly increasing in width from the inlet opening in the feed direction of the paste.