FI97531B - Disc material - Google Patents

Description

1 97531

SHEET MATERIALS TECHNICAL FIELD

The invention relates to a paper-based sheet material, to a method for its production and to products made therefrom.

TECHNICAL BACKGROUND

Paper-based board materials have previously been made from cardboard, cardboard, corrugated board, or kraft cardboard.

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GENERAL DESCRIPTION OF THE INVENTION

The invention and some of its applications are defined in the claims.

15 DETAILED DESCRIPTION OF THE INVENTION

Description of the drawings

In the accompanying drawings: Fig. 1 shows a sheet manufacturing process, Figs. 2 and 2a show the inner end sheet of a paper roll, Figs. 3 and 3a show a wrapping material, Fig. 4 shows a second wrapping material, Fig. 5 shows a third wrapping material and Fig. 6 shows a building board.

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Plate manufacturing

The board consists of a soft or semi-hard middle layer of shredded paper and on both sides • i. ··. ·. surface layers of purple. The surface layers are also the 30 best paper-based materials. The surface layer may be of another suitably soft or thin and flexible material.

The board is normally made by spreading paper waste to the desired particle size, adding glue to the chip, applying the chip to a uniform layer of the desired thickness, placing the desired adhesive surface layers on the top and bottom surface of the '35 chip and pressing time. If necessary, the pressure plates are heated.

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The sheets can be made either one sheet at a time, continuously or in steps from continuous.

The density, porosity, softness and elasticity of the middle layer can be adjusted by changing the particle size of the shred, the gluing 5 (quantity and quality of the glue) and the compression pressure of the sheets.

The shredder is comminuted into particles ranging in size from a single fiber to about 20 x 20 mm. The typical size is about 5 x 5 mm.

io The density of the middle layer is about 0.1 to 0.8 kg / dm 3, preferably about 0.2 to 0.5 kg / dm 3 and most preferably about 0.2 to 0.4 kg / dm 3. In order to achieve a sufficiently low density, it may be advantageous to wrinkle the shredded paper particles.

The thickness of the plate is about 2-20 mm.

As the adhesive, for example, urea-formaldehyde resin adhesive can be used. The adhesive is used relatively little. A suitable amount is about 2 to 10% by weight of the shred. Also, for example, starch glue, polyethylene or a similar plastic is suitable for the purpose.

20 According to one application, fusible plastic waste among paper waste can be used as an adhesive. In this case, the adhesive sheets are heated so much that the adhesive melts. The plastic that solidifies on cooling then binds the shredding together and the surface layers into the shredding. In order to make the plate as thick as possible and as even as possible, it is also best to cool it between the plates. For example, about 10 to 25% by weight (preferably about ... to 14 to 20% by weight) of polyethylene among the shredder is sufficient for gluing.

If there is not enough plastic, the plastic content can be • adjusted to suit by adding more shredded plastic or waste plastic, for example. The use of plastic gluing avoids the addition of glue. In addition, conventional plastics are more environmentally friendly than the actual adhesives.

Most preferably, the raw materials of the board are recycled.

The paper surface layer is typically kraft paper (ne-35 basis weight e.g. about 60 - 300 g / m2). The surface layer can also be laminated paper. For example, a plastic layer (e.g. polyethylene 10-30 g / m2) can be laminated to the paper to achieve moisture resistance. Newsprint, etc. also becomes a surface material.

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The desired additives can also be used in the paper. The surfaces of the plate can also be treated after pressing with suitable additives (e.g. preservatives).

Between the press plates, the desired pattern can be easily printed on either or both sides of the plate. Interchangeable patterning members such as yarns or nets on the surface of the press plate are best used for this purpose. An online or offline calender or a home calender can also be used.

io The plate manufacturing process is schematically illustrated in Figure 1.

The waste paper transported to the mill by the carriage 1 is stored in a silo 2. From the silo, the paper is taken to a crusher 4 by means of a conveyor 3. The crushed paper is blown into a cyclone separator 15 5, where the finest material is separated. The remaining shredder is lifted by means of a feeder 6 to a fan 7, by which the shredder is further blown into the spreading unit 8. The desired amount of glue is also dispensed into the spreading unit.

It is preferable to further wrinkle the pieces of paper before sprinkling. This can be done, for example, by forcing the shredder through a tapered screw conveyor, between two belts rotating at different speeds, or between two plates rotating relative to each other. Crimping is best performed so that the paper particles curl.

25 In the spreading unit 8, the shredder and the glue mixed therein are lifted into a uniform layer of the desired thickness on the bottom web 9. The top paper web 10 is passed over the shredding layer, after which the papers and shredder are pressed to the desired thickness in a heated press 11. The web of sheet material 30 is cut into sheets if desired and stacked with a cutter 12, kept in an intermediate storage 13 if necessary, and cut into pieces of the desired shape with a cutter 14 (e.g. a flat punch).

• · · 35 End flap

The paper rolls are usually packed at a paper mill by placing inner end flaps at the ends of the roll, wrapping a wrap extending over the roll ends around the roll wrapper, folding the wrap portion over the end evenly against the end, and gluing an outer end flap over the 97531 4. The purpose of the inner end tag is above all to protect the end of the roller from shocks and dents caused by hard particles.

Figures 2 and 2a show an inner end flap of a paper roll 5 according to the invention, which has a middle layer 15 made of paper shred, an inner surface layer 16 and an outer surface layer 17.

The density of the middle layer is preferably about 0.2 to 0.5 g / cm 3, most preferably about 0.2 to 0.4 g / cm 3. The thickness of the sheet is selected according to the weight of the paper roll. For the smallest rolls (less than 1 t) 10 up to 3 mm is sufficient, for large rolls (3 to 5 t) a suitable thickness is, for example, 7 mm and for extra large rolls up to 15 mm thick patches can be used. Thicker patches are also used when particularly good protection is desired.

The surface layers are preferably made of Kraft Paper (e.g. approx. 15 60 - 120 g / m2).

It is a good idea to make at least one of the surface layers moisture-proof, for example by using a polyethylene film (e.g. about 15-25 g / m 2) as a moisture barrier in the paper, either separately or pressed onto the paper. The polyethylene film best fits against the middle layer, whereby the layers seal well.

Moisture barrier is not required in both surface layers. Preferably, it is made in the inner surface layer 16, whereby it is best protected against breakage. An additional advantage in this case is that a porous, moisture-absorbing ..... layer 15 is left between the tight wrapper folded over the end of the roll and the moisture barrier ..... This prevents water between the wrapper and the patch from passing to the edge of the end, e.g. '. stationary.

• · • · 30 A mesh-like or lattice-like groove 18 is printed on the second surface layer of the patch. After all, the cloth is often inserted automatically in wrapping machines by means of suction cup grippers. The adhesion. From the point of view of the grooves, it may be certain to make a groove in the inner surface layer 16. The groove also increases the stiffness of the patch.

The grooving is made, for example, by placing suitable wires between the press plate and the surface layer before pressing.

Compared to the currently used inner end tags made of cardboard, cardboard, corrugated cardboard or kraft cardboard, the end tag according to the invention has e.g. the following advantageous features: 1) It is easy to make end patches of different thicknesses, so that you can always choose the 5 most optimal patches according to the weight of the roll and the need for protection.

2) The end flap is rigid and the stiffness is the same in all directions. This makes the tags easy to machine.

3) The air tightness is good, so the end patches can be handled well with suction cup grippers.

10 4) The flatness of the end flaps is very good, which makes it easy to get the packaging tight enough.

5) The absorbency of hard particles is very good due to the softness of the middle layer. Hard particles smaller than the thickness of the patch, such as sand grains on the floor, sink well into the patch without causing a wider deflection at the end of the roll. The patch also very effectively prevents the vibrations of the wrap from causing depressions on the end.

6) Water absorption is very good. Conventional moisture stresses (short-term transfer in rain, condensation, minor puddles on the substrate) do not cause moisture damage to the roller.

7) The duration of transport stresses is good. Normal humidity, vibration or overweight do not significantly affect the protective properties of the patch. For example, even if the roll is lowered to the substrate in a slightly oblique position, the edge of the patch will not be irreversibly flattened and thus pose a risk of skew in the stacks.

• · - Wrapping material 1 30 When the surface of the plate is grooved with transverse parallel grooves, a flexible wrapping material is obtained. The grooving can be done in the pressing step using suitable yarns or the like, as described above. Another option is to work on careers. This can be done before or after the joining of the surface layers 35. Such a material is particularly suitable as a packaging or protective material for elongated cylindrical objects of cross-section. Typical applications are, for example, packaging for steel bars, rolls and steel coils. The material is also well suited for lifting protection. The surface 97531 6 layer can be reinforced with a suitable mesh or covered with, for example, aluminum foil, if desired. Suitable substances for protecting the product to be wrapped, for example anti-corrosion agents, can also be used.

5 The material has very good protection properties compared to, for example, corrugated board. However, thanks to the grooving, the material can also be delivered in rolls.

Figures 3 and 3a show such a wrapping material. The material has an inner surface layer 19, a transversely grooved 20 ul-10 copy layer 21 and a shredding layer 22 between them.

The material can also be grooved in the longitudinal direction of the roll, in which case very long wrappers are obtained.

In addition, if a diagonal groove is made in the material, a material suitable for rotation in several limit-25 full layers is obtained around long round objects.

Figure 4 shows such material wrapped around a rod. The material has both transverse grooves 20 and diagonal grooves 23 in the outer surface layer.

If desired, a corrosion inhibitor, for example, can be added to the surface layers or to the entire material. The substance can be used to glue.

Wrapping material 2 The wrapping material can also be made in such a way that the middle layer of the plate 25 consists of separate parallel shredding strips. This results in an even more flexible material, which ..... is also very suitable for wrapping objects with an angular cross-section.

• «

Figure 5 shows such an application. It has strips 24 cut from shredders, which are placed side by side apart. A paper-based surface layer 25 and 26 is attached to the top and bottom of the strips. The surface layer can be, for example, mesh-reinforced or laminated ..! * (E.g. plastic or aluminum foil laminate), as required.

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building board

The board material is also suitable for construction purposes for such special parts where softness or flexibility in a certain direction is required of the board. An additional advantage, for example, compared to the 97531 7 corrugated board is the better sound insulation and acoustic properties.

A typical application is a parquet floor washer.

Figure 6 shows a reticulated surface-patterned 27 building board.

It is often advantageous for building boards to have fire resistance. This can be obtained by adding suitable flame retardants or by using suitable surface layer materials such as glass cloth, mineral fiber mesh, aluminum foil or paper treated with fire retardant.

• · »· 4% · t 4 * · 9% · 1 I« f f · •

Claims (19)

1. Disc material, which exhibits a middle layer (15/22/24) with pressed and Saininani-fused chops and on one side an inner surface layer (16/19/26) and on the other side an outer surface layer (17/21/25) , characterized in that the slab material is soft or semi-hard, that the chopping is a paper-based chopping and that the density of the middle layer is about 0.1 - 0.8 kg / m3. Disc material according to claim 1, characterized in that the inner surface layer, the outer surface layer or both are of paper-based material. 3. A material according to claim 1 or 2, characterized in that the density of the middle layer is about 0.1 - 0.5 kg / dm3, preferably about 0.2 - 0.5 kg / dm3 and most preferably about 0.2 - 0.4 kg / dm3, and that the thickness of the disc is about 2 - 20 mm. Material according to any of claims 1-3, characterized in that at least one of the surface layers is moisture resistant. Material according to any one of claims 1-4, characterized in that at the at least one side of the sheet material or at the middle layer there are provided 25 (18/20/23/27). 6. Material according to any of claims 1-5, ·; ··; characterized by the fact that the hacking is crumpled hacking, most preferably crumpled hacking. 7. A process for manufacturing a sheet material in accordance with any of claims 1-6, characterized in. by adding to the paper-based chopping • glue about 2 - 25% of the weight of the chopping, the chopping is spread to a smooth chopping layer, at one side of the chopping layer is placed an internal surface layer and on the other side an outer surface layer and the chopping layer and the surface layer are pressed together so that the chopping is glued together to a middle layer and the surface layer fixed to the middle layer. Process according to claim 7, characterized in that the adhesive is a urea-formaldehyde or starch adhesive, polyethylene or the corresponding plastic, and that about 2-10% of the weight of the chop is used. 9. A method of manufacturing a sheet material according to any one of claims 1-6, characterized in that the paper-based chopping containing plastic is formed into a uniform chopping layer, an inner surface layer is placed on one side of the chopping layer and on the other hand, an outer surface layer, the chopping layer and the surface layers are pressed into the saranan, so that the plastic in the chopping process is melted or cooled, so that the cooling plastic binds the chopping saranan to a middle layer and the surface layer at the middle layer. Method according to claim 9, characterized in that the chopping contains plastic about 10-25% of the weight of the chopping. 15 Method according to any of claims 7-10 for the manufacture of a material according to claim 5, wherein at least at one side of the disc there are arranged hazards, characterized in that the chopping and surface layers are pressed between the press discs and trees forming the hazards. formerly placed between the press plate and the surface layer. Method according to any of claims 7-11 for the manufacture of a material according to claim 6, characterized in that the paper-based chopping is wrinkled before the smooth chopping layer is formed by forcing the chopping through a tapered screw conveyor, two rotating at different speeds. straps or two in relation. rotating discs. * · 13. Internal end flap of a paper roll, characterized in that it is manufactured from a material according to 9 of any of claims 1-6. 14. End plate according to claim 13, characterized in that the density of the middle layer is about 0.2 - V '0.5 kg / dm3 and preferably about 0.2 - 0. , 4 kg / dm3, and the thickness of the disc is about 3 - 15 mm. 35 End cap according to claim 13 or 14, characterized in that one surface layer, preferably the inner surface layer, is moisture resistant. 97531 Endplate according to any of claims 13-15, characterized in that on one side dangers (18) are pressed into mesh formation. Wrapping material, characterized in that it is made of a material according to claim 5, and that the dangers (20) are parallel. A wrapping material, characterized in that it is made of a material according to any of claims 1-6 and that the middle layer is formed of free-standing parallel parallel to each other, hackle strips (24). 19. A building board, characterized in that it is of a material according to any of claims 1-6. 1 II • · · · • «I • (.» I> • · ·