JP2020090735A - Sheet forming device - Google Patents

Abstract

To provide a sheet forming device capable of easily forming watermark patterns having uneven shapes on a sheet.SOLUTION: The sheet forming device includes an endless mesh belt 23 traveling while holding fiber inclusions, a feeding part 19 for feeding the fiber inclusions to the mesh belt 23, and a pressing part 14 for pressing the fiber inclusions at a predetermined pressure; a watermark part 59 for forming watermark patterns is disposed on a sheet obtained by pressing the fiber inclusions in the pressing part 14; the watermark part 59 has a predetermined thickness, and watermark materials 96 having shapes of the watermark patterns are disposed on a fiber inclusion-holding face of the mesh belt 23; the pressing part 14 presses the fiber inclusions against the mesh belt 23 provided thereon with the watermark materials.SELECTED DRAWING: Figure 2

Description

The present invention relates to a sheet forming device.

Conventionally, there is known a technique of forming a watermark pattern forming portion on a paper making net in order to form a watermark pattern on paper. Patent Document 1 below discloses the use of a pattern net in which a watermark material having a stepwise change in thickness is formed on a paper net with a cylinder paper machine.

Japanese Patent No. 3198488

However, it is difficult to form a clear watermark pattern having a concavo-convex shape only by filtering the paper material with a pattern net formed with a watermark material as in the machine described in Patent Document 1 above.

The present invention solves the above-described problems, and an object of the present invention is to provide a sheet forming apparatus that can easily form a watermark pattern having an uneven shape on a sheet.

In order to achieve the above object, the sheet forming apparatus according to the present invention is an endless mesh belt that runs while holding a fiber-containing material, a supply unit that supplies the fiber-containing material to the mesh belt, and the fiber-containing material. A pressing part for pressing an object with a predetermined pressure, the sheet obtained by pressing the fiber-containing material in the pressing part is provided with a watermark part for forming a watermark pattern, and the watermark part has a predetermined thickness. And a watermark material having a shape of a watermark pattern is provided on the fiber-containing material holding surface of the mesh belt, and the pressing portion presses the fiber-containing material against the mesh belt provided with the watermark material.

Further, in the above configuration, it is possible to replace with a watermark material having a different thickness depending on the form of the watermark pattern.

Further, in each of the above configurations, the traveling speed of the mesh belt can be changed according to the form of the watermark pattern.

Further, in each of the above configurations, the pressing unit includes a pressing roller, and a plurality of the pressing rollers are installed in the traveling path of the mesh belt.

Further, in each of the above-described configurations, a suction unit that sucks the fiber-containing material via the mesh belt is provided.

Further, in each of the above configurations, the mesh belt runs at a speed of 0.1 m/min to 100 m/min.

According to the sheet forming apparatus of the present invention, the sheet obtained by pressing the fiber-containing material in the pressing section is provided with a watermark section for forming a watermark pattern, and the watermark section has a predetermined thickness. However, since a watermark material having a watermark pattern shape is provided on the fiber-containing material holding surface of the mesh belt, and the pressing portion presses the fiber-containing material against the mesh belt provided with the watermark material, unevenness is formed on the sheet. A watermark pattern having a shape can be easily formed.

In addition, depending on the form of the watermark pattern, if the watermark material can be replaced with a watermark material having a different thickness, the degree of unevenness of the watermark pattern can be adjusted appropriately.

Then, when the traveling speed of the mesh belt can be changed according to the form of the watermark pattern, the difference between the irregularities can be easily adjusted.

Further, the pressing unit includes a pressing roller, and when a plurality of the pressing rollers are installed in the traveling path of the mesh belt, a clear and beautiful watermark pattern can be formed.

Further, when a suction unit for sucking the fiber-containing material is provided through the mesh belt, the watermark pattern can be clearly formed.

Further, when the mesh belt travels at a speed of 0.1 m/min to 100 m/min, a watermark pattern can be formed more clearly than when the mesh belt travels at a high speed.

1 is a schematic configuration diagram of a paper manufacturing apparatus including a sheet forming apparatus according to an embodiment of the present invention. It is a longitudinal cross-sectional view showing a schematic configuration of the sheet forming apparatus. It is an expansion perspective view of the watermark material of the said sheet forming apparatus. FIG. 3 is a perspective view of a suction unit of the sheet forming apparatus and its periphery. FIG. 3 is a schematic configuration diagram of a suction pump of the sheet forming apparatus and its periphery. It is a longitudinal section showing a schematic structure of a sheet forming device concerning other embodiments of the present invention. It is a longitudinal cross-sectional view which shows the schematic structure of the sheet forming apparatus which concerns on other embodiment of this invention. It is an enlarged view of the watermarking material concerning other embodiments of the present invention. It is an enlarged view of the watermarking material concerning other embodiments of the present invention. It is an expansion perspective view of the suction part which concerns on other embodiment of this invention.

(First embodiment)
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic configuration diagram of a paper manufacturing apparatus including a sheet forming apparatus according to the first embodiment. The papermaking apparatus shown in FIG. 1 shows a case where the used paper recycling apparatus 100 uses wastepaper as a raw material for papermaking. In FIG. 1, a used paper recycling apparatus 100 includes a fiber-containing material manufacturing unit 1, a deinking unit 2, a papermaking unit 3, a finishing unit 4, and a control unit 8 for controlling each unit. In the present embodiment, the case where the sheet forming apparatus Q according to the present invention is used in the paper making unit 3 of the used paper recycling processing apparatus 100 that manufactures the recycled paper sheet 7 from the used paper 10 as a raw material is described, but this is not always the case. It is not limited to the above, it may be used in the papermaking section of a papermaking apparatus that uses other pulp raw materials such as wood as the papermaking raw material, and in the sheet forming section of the apparatus that forms a sheet by adding an additive such as a resin to the fiber-containing material. It doesn't matter.

The fiber-containing material manufacturing unit 1 disintegrates or defibrates the waste paper 10 to manufacture a fiber-containing material. The deinking unit 2 deinks the fiber-containing material including the fiber-containing material manufactured by the fiber-containing material manufacturing unit 1. The paper making unit 3 paper-forms the deinked fiber-containing material obtained in the deinking unit 2 to form a web W, presses the obtained web W, heats it, and dries it. The finishing 4 is finished by cutting the web W obtained in the paper making section 3 to obtain a sheet 7 of a standard size. The control unit 8 controls the overall operation of the used paper recycling processing apparatus 100. The fiber-containing material manufacturing unit 1 and the deinking unit 2 can use known fiber-containing material manufacturing apparatuses and deinking apparatuses, respectively.

FIG. 2 is a vertical cross-sectional view showing a schematic configuration of the sheet forming apparatus Q that constitutes the paper making unit 3. In the following description, the right side of the sheet forming apparatus Q shown in FIG. 2 is referred to as “front side”, the left side is referred to as “rear side”, the front side of the paper surface of FIG. 2 is referred to as “right side”, and the back side of the paper surface is referred to as “left side”. And The paper making unit 3 is configured such that the web forming unit 11, the pressing unit 14, and the heating unit 15 are housed in a housing (not shown). Inside the housing, a pair of left and right side plates (not shown) are arranged, and the side plates rotatably support most of the rollers constituting each part.

The web W is formed in the web forming unit 11. The web forming unit 11 includes a head box 12 and a wire portion 13. The head box 12 is for uniformly supplying the deinked fiber-containing material onto the mesh belt 23. The head box 12 includes a storage unit 18, a supply unit 19, and an inflow unit 20.

The storage section 18 stores the fiber-containing material. The supply unit 19 supplies the fiber-containing material stored in the storage unit 18 to the mesh belt 23. The inflow part 20 is formed at the bottom of the storage part 18. The inflow part 20 allows the fiber-containing material to flow into the storage part 18. A transport pump (not shown) is connected to the inflow section 20. The transport pump is for taking out the fiber-containing material after deinking from the deinking section 2 and sending it to the storage section 18.

The wire portion 13 includes a mesh belt 23, a tension adjusting portion 36, and a belt driving portion (not shown). The mesh belt 23 is formed in an endless shape. The mesh belt 23 runs while holding the fiber-containing material. The mesh belt 23 is stretched around a plurality of belt rollers 24. The mesh belt 23 travels upwardly at a bending portion 21 provided near the downstream end of the forward path running at an angle of about 5° to 85° with respect to the horizontal plane. The belt driving unit drives the mesh belt 23.

The tension adjusting unit 36 adjusts the tension of the mesh belt 23. Of the three belt rollers 24 installed below the supply unit 19, the tension adjusting unit 36 is provided near the widthwise ends of the belt roller 241 at the center in the vertical direction. The tension adjusting unit 36 includes a tension adjusting member 37, a shaft support member 41, and a fixing member 42. The tension adjusting member 37 is composed of, for example, a compression spring. The belt roller 241 is configured to be movable in the horizontal direction. The rotation shaft 242 of the belt roller 241 is supported by the shaft support member 41.

The fixing member 42 is fixed to a side plate (not shown) that constitutes the main body of the apparatus. The tension adjusting member 37 is installed in a compressed state between the fixing member 42 and the shaft supporting member 41. As a result, the shaft support member 41 is biased forward by the tension adjustment member 37 with respect to the fixed member 42. By moving the shaft support member 41 to the front side, the rotation shaft 242 of the belt roller 241 is biased to the front side with a predetermined pressing force, and a predetermined amount of tension is applied to the mesh belt 23.

The mesh belt 23 runs while holding the fiber-containing material supplied from the head box 12. The fiber-containing material supplied from the supply unit 19 of the head box 12 to the upper surface of the mesh belt 23 is filtered by the mesh belt 23 and formed into the web W. The web W is a wet paper which is a layer of fibers containing a predetermined amount of water.

The material of the mesh belt 23 may be metal such as bronze or stainless steel, or synthetic resin such as polyester or polyamide. A fine wire having a wire diameter of 100 to 1000 μm can be used. As the weave method, a plain weave, a long clamp weave, a monoprene weave, or the like can be used. The openings can be 4-120 mesh/inch.

A watermark portion 59 is provided on the mesh belt 23. The watermark portion 59 is for forming a watermark pattern such as characters, patterns, marks on the web W. The watermark section 59 is for forming a watermark pattern on the sheet 7. The watermark 59 is formed by attaching the watermark 96 to the fiber-containing material holding surface of the mesh belt 23. The watermark material 96 has a predetermined thickness and a watermark pattern shape.

The watermark part 59 is formed by, for example, a method of attaching a watermark material 96 made of wire, metal, resin, paper or the like to the mesh belt 23 with a fine metal wire, a method of soldering, a method of adhering with an adhesive, a paint on the mesh belt 23, or the like. A method of constructing a watermark material 96 in which a part or all of the watermark pattern is projected from the fiber-containing material holding surface of the mesh belt 23 while the mesh pattern is covered with a resin, And forming a part or all of the watermark pattern by the watermark material 96 protruding from the fiber-containing material holding surface of the mesh belt 23, and using a photosensitive resin on the fiber-containing material holding surface of the mesh belt 23. It can be provided by a method of forming with the formed watermark material 96.

The method of attaching the watermark material 96 made of resin or the like to the mesh belt 23 with an adhesive can be performed, for example, by the following procedure. First, an adhesive is applied to the back surface, and a resin sheet 93 such as a cutting sheet to which a release sheet 94 such as release paper is attached is cut into a predetermined shape using a cutting plotter or the like. FIG. 3 shows an example of the watermark material 96. In the figure, the resin sheet 93 is cut into the shape of the outline of a cherry blossom. Here, the design of the watermark pattern arranged on the resin sheet 93 may be plural as shown in FIG. By arranging a plurality of the same or different characters, figures, images, etc. at mutually separated positions on the resin sheet 93, the respective positional relationships are maintained and the arrangement order is not changed. A watermark pattern can be formed.

Next, the protective sheet 7 is attached to the surface of the cut resin sheet 93. As a result, it is possible to prevent the mutual positional relationship of the individual characters, figures, images, patterns, patterns, etc. of the resin sheet 93 from being disturbed. Then, the release sheet 94 is peeled from the back surface, and the watermark material 96 is fixed to a predetermined position of the mesh belt 23 with an adhesive. At this time, in order to improve the adhesive strength of the watermark material 96, heat treatment or replenishment of the adhesive may be performed if necessary. As a result, by cutting out only the outline of the pattern as shown in the figure, the watermark material 96 is prevented from peeling off during sheet formation even when the adhesive area of the wire watermark material 96 to the mesh belt 23 is small. Can be suppressed. After that, the protective sheet 7 covering the surface of the resin sheet 93 is peeled off.

As a material of the resin sheet 93, a vinyl chloride resin, a polyolefin resin, a polyester resin, a polyacrylate resin such as polypropylene, or the like can be used alone or in combination. The resin sheet 93 may have a surface coated with a paint having durability and water resistance such as polyurethane resin, polyacrylic acid ester resin, polyester paint, polyamide resin, epoxy resin, and silicone rubber. By this surface treatment, durability and water resistance of the watermark material can be improved. The resin sheet 93 may be made of foamed resin. Further, the resin sheet 93 may be made of a material having a water absorbing property.

The thickness of the resin sheet 93 can be set to about 0.05 mm to 0.5 mm, preferably 0.70 mm to 0.3 mm. By setting the thickness of the resin sheet 93 to be 0.05 mm or more, it is possible to more clearly form the watermark pattern of the obtained sheet 7 such as characters, figures, pictures, and images. Further, by setting the thickness of the resin sheet 93 to 0.5 mm or less, it is possible to prevent the thickness of the watermark pattern from becoming excessively thin, and prevent the sheet 7 from having holes or cracks.

Further, the watermark materials 96 having different thicknesses may be appropriately selected and replaced according to the desired watermark pattern form. Accordingly, the degree of unevenness of the watermark pattern on the obtained sheet 7 can be adjusted appropriately.

In the method using a photosensitive resin, a first photosensitive resin layer is formed on the mesh belt 23, a desired pattern is placed on the first photosensitive resin layer, exposed, and developed to form an image of the first layer. A second photosensitive resin layer is laminated on the layer image, a desired pattern smaller than the image of the first layer is placed thereon, exposed and developed to develop the image of the second layer on the image of the first layer. Is formed, and if necessary, a plurality of layers of images are sequentially formed on the image of the second layer in the same manner to form a watermark material 96 whose thickness changes stepwise on the mesh belt 23. Can be used. As the type of photosensitive resin, polyurethane, polyvinyl, polyester, polyamide, polyacryl and the like can be used.

When the papermaking apparatus is small, the operation speed of the mesh belt 23 is set slower than that of a large-sized papermaking apparatus installed in a papermaking factory. For example, the traveling speed of the mesh belt 23 is set to about 0.1 m/min to 100 m/min, preferably about 0.5 m/min to 50 m/min.

The traveling speed of the mesh belt 23 can be changed according to the form of the watermark pattern. When the traveling speed of the mesh belt 23 is low, the pressing time in the pressing portion 14 is longer than when the traveling speed is high. Therefore, the difference in the unevenness of the watermark pattern formed on the obtained sheet 7 becomes large, and a clear watermark pattern can be formed. On the other hand, when the traveling speed of the mesh belt 23 is high, the unevenness of the sheet 7 becomes smaller than when the traveling speed is low. Therefore, it is possible to intentionally form a watermark pattern with an ambiguous outline.

A plurality of draining plates 26 are arranged at predetermined intervals below the mesh belt 23 on the forward path traveling on the upper side. The draining plate 26 drains the fiber-containing material. Each draining plate 26 extends in the left-right width direction intersecting the running direction of the mesh belt 23, and is in sliding contact with the lower surface of the mesh belt 23. As a result, the draining plate 26 guides white water, which is a liquid component flowing down from the mesh of the mesh belt 23, downward.

Further, below the draining plate 26, there is provided a water receiving portion 27 that receives white water flowing directly from the draining plate 26 or from the mesh of the mesh belt 23. White water is a liquid produced by filtering a fiber-containing material with the mesh belt 23, and contains fine fibers and pulp and water. The water receiving portion 27 is connected to a white water tank 29 installed below by a pipe, a guide and the like not shown. The white water tank 29 includes a pipe and a white water circulation pump (not shown) for sending the white water contained therein to the fiber-containing material manufacturing unit 1 and the deinking unit 2, and the white water collected in the water receiving unit 27 can be reused. I am configuring.

In addition, the web forming unit 11 is provided with a suction unit 35 that sucks the fiber-containing material through the mesh belt 23. The suction unit 35 is installed below the supply unit 19. The suction unit 35 is installed at a position on the downstream side in the traveling direction of the mesh belt 23 in the supply region where the fiber-containing material is supplied from the supply unit 19 onto the mesh belt 23. The suction portion 35 is provided at a position downstream of the supply end portion 19a where the fiber-containing material is supplied from the supply portion 19 onto the mesh belt by a predetermined amount in the traveling direction of the mesh belt 23. The suction unit 35 is installed at an inner position of the mesh belt that travels around.

The suction unit 35 sucks the fiber-containing material via the mesh belt 23. The suction unit 35 includes a suction member 77. The suction member 77 is installed inside the endless mesh belt 23 with its longitudinal direction oriented along the width direction of the mesh belt 23. The suction member 77 is installed between the mesh belt 23 and the water receiving section 27. The upper surface of the suction member 77 is in sliding contact with the lower surface of the mesh belt 23 traveling above.

FIG. 4 is a perspective view of the suction member 77. The suction member 77 includes a suction box 80 formed in a long box shape. A rectangular suction port 81 extending in the width direction H of the mesh belt 23 is provided on the upper surface of the suction member 77. In the suction port 81, a cut portion 84 having a predetermined shape is formed on the upper plate 83 of the suction box 80, and a cut piece 85 formed by this cut is bent at a right angle toward the inside of the suction box 80. Is formed by. In addition, instead of the configuration in which the cut piece 85 is bent, a rectangular punch may be used.

The traveling direction of the mesh belt 23 with which the upper plate 83 is in sliding contact is the direction indicated by arrow F in the figure. The bent portion 86 formed by bending the cut piece 85 is installed at a position on the downstream side in the traveling direction F of the mesh belt 23 traveling above, while facing the folded portion 86, the mesh belt The notch 84a extending in the width direction H of the mesh belt 23 is installed at a position on the upstream side of the mesh belt 23 in the traveling direction F. The length of the suction port 81 in the width direction H is formed on the mesh belt 23 to be substantially the same as the width to which the fiber-containing material is supplied. Further, the suction base portion 33 is opened and formed on one side plate 72 of the suction box 80.

The suction member 77 is connected to a suction pipe 78 provided with a suction pump 79 at an intermediate position. FIG. 5 is a schematic view of the suction pump 79 and its periphery. As shown in the figure, one end side of the suction pipe 78 is connected to the suction base portion 33 provided in the suction member 77. The other end of the suction pipe 78 is connected to the white water tank 29. A suction pump 79 is installed in the middle of the suction pipe 78. The suction pump 79 is provided to suck the fiber-containing material through the suction port 81. The suction pump 79 is configured to be able to suck at least water and air.

In the figure, an example using a tube pump 87 as the suction pump 79 is shown. However, instead of the tube pump 87, the suction pump 79 may use, for example, a piston pump, a plunger pump, a vane pump, a squeeze pump, or the like. The tube pump 87 is preferable because it can suck at least moisture and air among these various pumps, consumes less power, and requires less installation space. The suction pump 79 can also be used in combination with a blower and a gas-liquid separator that separates a liquid component containing a sucked fine pulp or other solid content and a gas component such as air. As the blower, various blowers such as a sirocco fan, a turbo fan, and a limit road fan can be used.

The tube pump 87 includes a flexible tube 88, a casing 89, a pressing member 90, a rotor 91, and a rotor drive unit (not shown). The flexible tube 88 is supported by an arcuate guide surface 89a in the casing 89.

The pressing member 90 is composed of a pressing roller rotatably supported on the top of a rotor 91 having a substantially equilateral triangle. The pressing member 90 is rotatable along the guide surface 89a of the casing 89 with the rotation of the rotor 91, and the flexible tube 88 is crushed between the guide surface 89a and the guide surface 89a toward the discharge side. The contents of the flexible tube 88 are transferred. The rotor driving unit drives the rotor 91 to rotate.

The suction force from the suction portion 35 of the web forming portion 11 can be set to, for example, 0.01 MPa to 1 MPa, preferably 0.05 MPa to 0.5 MPa. The suction amount by the suction unit 35 of the web forming unit 11 is, for example, 0.01 L/min to 200 L/min, preferably 0.05 L/min to 100 L/min, and more preferably 0.3 L/min to 50 L/min. is there.

The pressing portion 14 shown in FIG. 2 presses the fiber-containing material with a predetermined pressure. Then, the pressing portion 14 presses the fiber-containing material against the mesh belt 23 to which the watermark material 96 is attached. The pressing unit 14 includes a pressing roller 45. The pressing roller 45 is installed on the bending portion 21. In the curved portion 21, the running direction of the mesh belt 23 is curved upward from a substantially horizontal direction. The pressing roller 45 also serves as the belt roller 24 that spans the mesh belt 23. The mesh belt 23 is arranged so as to run along the outer peripheral surface of the pressing roller 45 over a predetermined range. Within this predetermined range, the mesh belt 23 holds the web W with the pressing roller 45. FIG. 2 shows a case where the pressing roller 45 is installed so as to contact the upper surface or the rear side surface of the mesh belt 23.

A predetermined amount of tension is applied to the mesh belt 23 by the tension adjusting section 36. The pressing roller 45 comes into contact with the mesh belt 23 to which the tension is applied by the tension adjusting unit 36 at a predetermined pressure, and sandwiches the web W formed on the mesh belt 23 and presses the web W.

The pressing roller 45 is connected to the belt driving unit via a connecting mechanism. The pressing roller 45 is rotationally driven in synchronization with the other roller 24 around which the mesh belt 23 is stretched. However, instead of this, the pressing roller 45 may not be connected to the belt driving unit by the connecting mechanism. When the pressing roller 45 is not connected to the belt driving unit, the pressing roller 45 may be driven to rotate as the mesh belt 23 travels, or may be rotationally driven by a separately provided driving unit.

The material of the pressing roller 45 may be metal, resin, rubber or the like. Examples of the metal include stainless steel, iron and aluminum. Examples of the resin include urethane, nylon, polypropylene, polyethylene, polyethylene terephthalate, vinyl chloride, synthetic resin such as ABS resin and fluorine resin, or natural resin. Examples of the rubber include synthetic rubbers such as isoprene rubber, butadiene rubber, styrene butadiene rubber, styrene isoprene butadiene rubber, ethylene propylene diene rubber, chloroprene rubber, acrylonitrile butadiene rubber, butyl rubber, fluororubber, urethane rubber and silicone rubber or natural rubber. Be done. In addition, two or more of these may be used in combination, and in that case, they may be formed in layers.

Of these, by using rubber for the pressing roller 45, the pressing roller 45 is easily elastically deformed when the web W is pressed. When the pressing roller 45 elastically deforms in this way, the web W can be pressed sufficiently. Further, the peelability of the web W is improved. Further, the pressing roller 45 is surface-treated with a silicone resin or a fluorine-based resin, whereby the peelability of the web W can be further improved.

The heating unit 15 shown in FIG. 2 includes a sandwiching belt 48, a heating drum 50, a temperature sensor 66, and a scraper 55. The sandwiching belt 48 sandwiches the web W delivered from the mesh belt 23 with the heating drum 50 and runs. The holding belt 48 is formed in an endless shape and is stretched around a heating drum 50 and a plurality of belt rollers 49.

The sandwiching belt 48 is wound around a range of approximately 3/4 of the outer circumference of the heating drum 50. The sandwiching belt 48 projects and travels upward so as to face the mesh belt 23 that projects and travels upward. The mesh belt 23 and the sandwiching belt 48 are arranged apart from each other by a predetermined amount without contacting each other at the facing position. The sandwiching belt 48 is driven to travel by a sandwiching belt drive unit (not shown).

The nipping belt 48 nips and conveys the wet web W with the heating drum 50 in the range wound around the heating drum 50. The material of the holding belt 48 is not particularly limited, and for example, synthetic fibers such as metal, polyester and polyphenylene sulfide, and natural fibers such as hemp and cotton are used. The sandwiching belt 48 is preferably formed of a woven fabric in which warp yarns and weft yarns are woven in order that the heating efficiency of the web W is high.

The heating drum 50 includes a cylindrical body 58 formed in a hollow cylinder shape, and the left and right side surfaces orthogonal to the cylinder center of the cylindrical body 58 are closed by a disk-shaped lid body 59. Further, the tubular body 58 is rotatably supported by a plurality of support rollers 61. A heating means 62 is provided on the inner peripheral surface of the cylindrical body 58. The heating means 62 is soft and flexible and is composed of a heating body such as a silicon rubber heater formed in a sheet shape. The heating element is attached to the inner peripheral surface of the cylindrical body 58 over the entire circumference. The tubular body 58 is driven to rotate by the sandwiching belt 48 being driven to travel by the sandwiching belt drive unit.

As shown in FIG. 2, the temperature sensor 66 is installed in the upper rear part of the heating drum 50. The temperature sensor 66 detects the surface temperature of the cylindrical body 58. In the present embodiment, the temperature sensor 66 is configured to slidingly contact the surface of the cylindrical body 58 to detect the temperature of the cylindrical body 58, but a non-contact sensor may be used for the cylindrical body 58. The scraper 55 is installed behind the upper part of the heating drum 50 and upstream of the temperature sensor 66 in the rotation direction of the heating drum 50. The scraper 55 removes the heated web W from the heating drum 50 and guides the web W to the finish 4.

(Finishing)
The finisher 4 shown in FIG. 1 includes a cutting blade (not shown) that cuts the web W into a predetermined sheet size. The cutting blade includes a pair of left and right slitters and a cutter. The slitter is composed of a round blade. The cutter is composed of a pair of upper and lower straight blades extending along the width direction. Below the cutting blade, an end material recovery box (not shown) for recovering the end material generated by the cutting is installed.

(Control unit)
The control unit 8 includes a storage unit including a RAM and a ROM, a CPU, and the like. Various programs for operating the CPU are stored in the storage unit. The control unit 8 controls the operation of each unit according to various programs stored in the storage unit, and controls the operation of the entire used paper recycling processing apparatus 100.

The operation of the above configuration will be described below. When the operation of the papermaking device is started, the fiber-containing material production section 1 produces a fiber-containing material by subjecting waste paper as a raw material to disintegration or defibration. The obtained fiber-containing material is deinked in the deinking unit 2. The fiber-containing material after deinking is caused to flow into the storage section 18 from the inflow section 20. The fiber-containing material that has flowed into the storage portion 18 overflows from the storage portion 18 and is supplied from the supply portion 19 to the upper surface of the running mesh belt 23. The fiber-containing material is filtered by the mesh belt 23 to form a web W that is a uniform fiber layer. White water generated by filtering the fiber-containing material with the mesh belt 23 is received by the water receiving portion 27, then sent to the white water tank 29, and is stored in the white water tank 29.

Further, at this time, the control unit 9 drives the rotor driving unit to rotate the rotor 91 in the clockwise direction J in FIG. 5, and the flexible tube 88 is interposed between the pressing member 90 and the guide surface 89a of the casing 89. The pressing member 90 is rotated while being crushed. Then, the inside of the suction box 80 has a negative pressure, and the fiber-containing material on the mesh belt 23 is sucked from the suction port 81. As a result, liquid components and gas components such as air contained in the fiber-containing material are sucked and drawn into the suction box 80 through the suction port 81. In addition to water, the liquid components to be aspirated include fine fibers, calcium carbonate, sizing agents, etc., which were once contained in the raw materials of waste paper and became suspended or mixed in the fiber-containing material by the disintegration or defibration process. Additives, deinking agents added for deinking treatment, etc. are included. By this suction, the dehydration efficiency can be improved by assisting the filtration of the fiber-containing material by its own weight.

Further, the mesh belt 23 is provided with the watermark portion 59 for forming a watermark pattern on the web W, and the suction portion 35 for sucking the fiber-containing material through the mesh belt 23 is provided, so that the watermark pattern is formed more clearly. can do. When the resin sheet 93 of the watermark portion 59 is made of a water-absorbing material, the watermark portion 59 is formed flexibly as compared with the case where the upper surface of the web W is pressed by being formed of wire like a conventional dandy roll. It is possible to improve the water absorbency, and it is possible to efficiently form a watermark pattern.

Since the suction unit 35 is installed below the supply unit 19, when the fiber-containing material supplied by the supply unit 19 is filtered by the mesh belt 23 by its own weight, the watermark unit 59 efficiently increases the synergistic effect of its own weight and suction. A watermark pattern can be formed well.

Since the suction unit 35 is installed at a downstream position in the traveling direction of the mesh belt 23 in the supply region where the fiber-containing material is supplied from the supply unit 19 onto the mesh belt 23, the traveling of the mesh belt 23 in the supply region. A clearer watermark pattern can be formed as compared with the case where the watermark pattern is provided on the upstream side in the direction. In order to uniformly disperse the fibers contained in the fiber-containing material on the mesh belt 23 and to manufacture a high quality sheet, the ratio of the liquid content of the fiber-containing material supplied from the supply unit 19 onto the mesh belt 23 is set. It is preferable to set the state to a high predetermined value or more. When such a fiber-containing material having a high liquid content ratio is supplied from the supply unit 19 onto the mesh belt 23, a large amount of liquid is guided downward by its own weight at the upstream side position of the supply region, and the mesh belt 23 meshes. Pass through. As a result, the ratio of the liquid content of the fiber-containing substance decreases sharply. At the position on the downstream side of the supply region, less liquid drops due to its own weight than at the position on the upstream side. By forcibly sucking the liquid component by the suction unit 35 at the point where the ratio of the liquid component falling downward is reduced, the liquid component can be further removed from the fiber-containing material, and the dehydration can be efficiently performed.

Further, the suction unit 35 is installed at a downstream side position in the traveling direction of the mesh belt 23 in the supply region where the fiber-containing material is supplied from the supply unit 19 onto the mesh belt 23, so that the fibers on the mesh belt 23 are Can be in a state suitable for forming a clear watermark pattern. As described above, the ratio of the liquid content on the mesh belt 23 is very high at the upstream side position of the supply region. Therefore, the fiber-containing material does not try to stay for a long time in the watermark portion 59 of the mesh belt 23 in which the mesh is closed, and the mesh where the watermark 59 is not provided is released so that the liquid component can pass through the mesh. Move quickly to. For this reason, the movement of the fibers is likely to be intense at the upstream side position of the supply region. Therefore, if suction is performed at the upstream position, there is a risk that the web will be punctured. However, at the position on the downstream side of the supply region, the fibers do not move as strongly as at the position on the upstream side, and proper movement can be secured.

The suction portion 35 is included in the fiber-containing material when it is provided at a position downstream of the supply end portion 19a where the fiber-containing material is supplied from the supply portion 19 onto the mesh belt 23 by a predetermined amount in the traveling direction of the mesh belt 23. The liquid can be sucked by the suction unit 35 at a position where the ratio of the liquid content is more appropriate. Therefore, a better watermark pattern can be formed. In the case where the mesh belt 23 in the supply unit 19 is configured to run with an upward inclination, a region where fibers can stay is more likely to be formed on the upstream side of the mesh belt 23 than when the mesh belt 23 is installed horizontally. Formation is improved.

When the mesh belt 23 travels at a speed of 0.1 m/min to 100 m/min, the mesh belt 23 bends at a high speed while traveling, as in the case of a large-sized paper manufacturing apparatus installed in a paper mill. However, it is impossible to remove the liquid content from the fiber-containing material by centrifugal force. Therefore, by sucking with the suction unit 35, the liquid content can be efficiently removed from the fiber-containing material and dehydrated. Further, in a large-sized papermaking machine installed in a papermaking factory, like the conventional dandy roll, the watermark portion is formed of wire and has water permeability, so that the water content of the high-speed traveling web W is removed by centrifugal force. While the watermark pattern can be formed while the mesh belt 23 is traveling at a speed lower than that of a large-sized paper manufacturing apparatus, the watermark portion 59 is made of a water-absorbing material and attached to the mesh belt 23. , The water content of the web W can be removed. Then, the watermark pattern can be formed efficiently.

Of the rectangular opening forming the suction port 81, the portion slidingly contacting the mesh belt 23 on the downstream side in the traveling direction is the bent portion 86 formed by bending the cut piece 85, and thus the mesh belt. When the watermark portion 59 of 23 is in sliding contact with the suction member 77, it is difficult to damage the watermark portion 59.

The white water that has flowed into the suction box 80 from the suction port 81 is transferred from the suction source portion 33 to the suction pipe 78, is sent to the white water tank 29 via the suction pump 79, and is stored therein.

The web W formed on the mesh belt 23 by filtration is conveyed to the downstream side as the mesh belt 23 travels.

The control unit 8 forms the web W with a paper thickness in the leading edge region of the web W formed on the mesh belt 23 and a thickness of the leading edge region thicker than the thickness of the papermaking region set in the papermaking region following the leading edge region. Control to do so. Therefore, the control unit 8 controls the belt drive unit so that the traveling speed of the mesh belt 23 when forming the leading end region of the web W is slower than that when forming the papermaking main region. Further, instead of this, the control unit 8 starts the supply of the fiber-containing material from the head box 12 onto the mesh belt 23, and stops the running of the mesh belt 23 for a predetermined time when forming the front end region of the web W. May be controlled as follows. Further, the control unit 8 controls the driving amount of the transport pump so as to be larger when forming the front end region of the web W than when forming the papermaking main region, so that the fiber-containing substance to be flowed into the inflow unit 19 is controlled. The tip region of the web W may be thickened by increasing the amount.

After the leading end region of the web W is formed, when the leading end region reaches the pressing portion 14, the web W bends upward along the outer peripheral surface of the pressing roller 45 and the mesh belt 23 and the pressing roller. It is sandwiched between 45 and pressed. The web W on the mesh belt 23 running in the horizontal direction in FIG. 3 is pressed from above by the pressing roller 45 and is sandwiched between the web W and the mesh belt 23, so that the liquid component contained in the web W is contained in the mesh belt 23. Will be led below. Then, the pressure roller 45 is gradually pressed against the mesh belt 23 that curves and runs along the outer peripheral surface of the pressing roller 45. The web W is pressed by the tension of the mesh belt 23.

Therefore, the web W is pressed with a small pressing force as compared with the case where the web W is sandwiched by a pair of pressing rollers arranged above and below the mesh belt 23 traveling in the horizontal direction. In this case, the movement of the fibers contained in the web W is less than that in the case where the web W is forcibly pressed with a large pressing force at the nip position of the pair of pressing rollers with the high water content, and the quality of the sheet obtained after heating is improved. It can be improved.

When the location where the watermark portion 59 is provided on the mesh belt 23 reaches the pressing portion 14, the web W is pressed by the pressing roller 45 in a state where the web pattern is present. The web W on the watermark material 96 has a small amount of fibers and is formed thin. When the watermark pattern is pressed by the pressing roller 45, it is sufficiently pressed. The watermark pattern is thinner than the peripheral portion, is sufficiently compressed, and is formed as a recess. In particular, of the front and back surfaces of the web W, the watermark material 96 forms larger unevenness on the back surface in contact with the mesh belt 23. On the other hand, the surface that is in contact with the pressing roller 45 has less unevenness than the back surface. In this way, in the watermark pattern portion, the contour line is formed due to the difference in light transmittance when viewed through the watermark, and the contour line is more clearly and distinctly formed due to the unevenness.

The watermark portion 59 has a predetermined thickness, and the watermark material 96 having a watermark pattern shape is attached to the fiber-containing material holding surface of the mesh belt 23, and the pressing portion 14 is attached with the watermark material 96. Since the fiber-containing material is pressed against the mesh belt 23, the watermark pattern can be processed to be uneven. The shape of the unevenness formed on the web W is only one of the front and back surfaces of the sheet 7 that comes into contact with the fiber-containing material holding surface of the mesh belt 23 when the pressing force by the pressing roller 45 is not more than a predetermined value. Becomes At this time, the other surface of the web W is formed in a relatively smooth state in which unevenness is not seen so much. As described above, by adjusting the pressing force of the pressing portion 14 to a predetermined value or less, it is possible to make the front and back surfaces of the watermark pattern forming portion of the sheet 7 different in form.

On the other hand, when the pressing force of the pressing portion 14 exceeds the predetermined value, not only the one surface of the web W but also the other surface can be provided with the uneven shape at the watermark pattern forming position.

By appropriately selecting the thickness of the resin sheet 93 that constitutes the watermark material 96, the watermark pattern formed on the sheet 7 can be adjusted to a desired form. When the watermark material 96 is thick, the difference in the unevenness of the watermark pattern portion can be increased when the watermark material 96 is pressed by the pressing roller 45 with the same pressing force than when it is thin. Then, the outline of the watermark pattern can be made more prominent. On the other hand, when the watermark material 96 is thin, the difference in the unevenness of the watermark pattern is smaller when the watermark material 96 is pressed with the same pressing force than when it is thick. As a result, the contour of the watermark pattern can be made obscure so as not to be noticeable so that the surface of the watermark pattern on the sheet 7 can be made relatively smooth.

If necessary, the watermark material 96 having a different thickness may be exchangeable depending on the form of the watermark pattern. In this way, if the watermark material 96 is replaceable, the mesh belt 23 is detached from the sheet forming apparatus and replaced when the watermark pattern is to be changed in shape, such as when the mesh belt 23 itself is formed with a watermark pattern. This eliminates the need for large-scale work and improves workability. And, it is possible to reduce the cost for changing the watermark pattern of a different form.

Further, the traveling speed of the mesh belt 23 can be changed according to the form of the watermark pattern. When the traveling speed of the mesh belt 23 is low, the pressing time of the web W becomes longer than when the traveling speed is high, even when the mesh roller 23 is pressed by the pressing roller 45 with the same pressing force. Therefore, it is possible to further increase the difference in the unevenness of the watermark pattern. Then, the outline of the watermark pattern can be made more prominent. On the other hand, when the traveling speed of the mesh belt 23 is high, the pressing time of the pressing roller 45 is shorter than when it is low. Therefore, the outline of the watermark pattern can be ambiguous.

Further, it is possible to change the pressing force of the pressing roller 45 according to the form of the watermark pattern. When the pressing force of the pressing roller 45 is large, when the traveling speed of the mesh belt 23 is the same as when the pressing force of the pressing roller 45 is small, and the pressing time of the web W by the pressing roller 45 is the same, the difference in unevenness of the watermark pattern can be further increased. .. Then, the outline of the watermark pattern can be made more prominent. On the other hand, when the pressing force of the pressing roller 45 is large, when the traveling speed of the mesh belt 23 is the same as when the pressing force is small, the contour of the watermark pattern portion can be made vague.

The web W on the mesh belt 23 is sandwiched between the pressure roller 45 and the web W, and is pressed and then conveyed as the mesh belt 23 travels. Then, as shown in FIG. 2, the front end region of the web W is conveyed obliquely upward. The front end region of the web W is formed thick, and the web W has a certain amount of elasticity by being pressed by the pressing portion 14. When the leading end region G of the web W reaches the conversion position T of the mesh belt 23 where the belt roller 24 is installed at the highest position, the web W is peeled off from the mesh belt 23 and diagonally upward right as shown by the solid line in FIG. Independently transported to.

When the length of the leading end region G of the web W extending upward from the mesh belt 23 reaches a predetermined length, the leading end region G of the web W buckles due to its own weight, as indicated by the alternate long and short dash line. Then, it is supported by a sandwiching belt 48 facing the mesh belt 23. The leading end region G of the web W enters between the sandwiching belt 48 and the heating drum 50, and is sandwiched and conveyed between the sandwiching belt 48 and the heating drum 50 at the abutting portions thereof.

The web W is brought into contact with the heating drum 50 heated by the heating means 62. As a result, the wet web W is heated to obtain a strip-shaped sheet before finishing. The temperature of the heating drum 50 is detected by the temperature sensor 66 and is maintained at a predetermined temperature.

The strip-shaped sheet before finishing obtained in the heating section 15 is peeled from the heating belt 47 by the scraper 55 and sent to the finishing section 4. The strip-shaped sheet sent to the finisher 4 is cut into a predetermined sheet size by a cutting blade to complete the sheet 7. At that time, the slitter cuts both end portions in the width direction of the strip-shaped sheet along the longitudinal direction. In the cutter, the upper straight blade moves up and down with respect to the lower straight blade to cut the sheet along the width direction. The end material of the sheet 7 cut by the cutting blade is collected in the end material collection box. The scrap material in the scrap material recovery box is returned to the fiber-containing material manufacturing unit 1 as shown in FIG. 1 and used again as a raw material for waste paper for manufacturing the sheet 7.

When the tube pump 87 is used as the suction pump 79, the tube pump 87 is smaller than a vacuum pump or the like and can be installed in a small installation space. Further, the tube pump 87 consumes less power than the vacuum pump, and it is possible to reduce the cost.

(Second embodiment)
FIG. 6 is a vertical sectional view showing a schematic configuration of the sheet forming apparatus Qa according to the second embodiment. In the above-described first embodiment, the pressing portion 14 is composed of one pressing roller 45, but in the second embodiment, the pressing portion 14a includes a pair of pressing rollers 45a facing each other via the mesh belt 23a. Equipped with. The pressing roller 45a holds and presses the web Wa formed on the mesh belt 23a.

The pair of pressing rollers 45a includes a first pressing roller 67 and a second pressing roller 68. The first pressing roller 67 can sandwich the web W with the mesh belt 23a. The second pressing roller 68 is arranged to face the first pressing roller 67 via the mesh belt 23a. The first pressing roller 67 is installed outside the mesh belt 23a running around. The second pressing roller 68 is installed inside the mesh belt 23a.

As the material of the first pressing roller 67 and the second pressing roller 68, the same material as the pressing roller 45 of the first embodiment can be used. Further, the second pressing roller 68 may be configured to absorb water. Examples of the water-absorbing structure include sponges, foams, porous bodies, cloths, knitted fabrics, and non-woven fabrics.

The first pressing roller 67 is rotatably supported by a side plate that constitutes the main body of the apparatus. The second pressing roller 68 is rotatably supported by the side plate while being movable in a direction in which the second pressing roller 68 approaches the first pressing roller 67. As shown in the figure, both widthwise end portions of the rotating shaft 681 of the second pressing roller 68 are connected to the rotating shaft 671 of the first pressing roller 67 by a pressing force applying member 69. The pressing force applying member 69 is composed of a tension spring. The urging force of the pressing force imparting member 69 urges the second pressing roller 68 in the direction of approaching the first pressing roller 67.

While being in contact with the mesh belt 23a, the first pressing roller 67 continuously holds and presses the web W with the mesh belt 23a. At the nip portion N between the first pressing roller 67 and the second pressing roller 68, the web W is sandwiched between the rollers 67 and 68, pressed, and dehydrated. The liquid component generated by the dehydration passes through the mesh of the mesh belt 23 and is guided downward. Then, this liquid component propagates downward along the rear peripheral surface of the second pressing roller 68.

Therefore, as compared with the case where the second pressing roller 68 is not installed as in the first embodiment, the web W can be sandwiched and pressed by the pair of pressing rollers 45a in the nip portion N, and a larger amount of liquid can be collected. It can be removed from the web W. Further, since the liquid component that has passed through the mesh is properly guided downward by the second pressing roller 68, the water content can be removed more efficiently.

When the second pressing roller 68 is configured to absorb water, a larger amount of liquid can be quickly removed from the web W. By removing a larger amount of liquid from the web W in a short time by the water absorbing force of the second pressing roller 68, a more beautiful watermark pattern can be formed at the installation position of the watermark material 96 on the mesh belt 23. ..

Further, when the first pressing roller 67 is made of rubber, the liquid component generated from the web W in the nip portion N is pressed by the first pressing roller 67 having almost no water absorption. In this case, the adhesion of the fibers to the first pressing roller 67 can be suppressed, and the winding of the web W around the first pressing roller 67 due to this can be suppressed. When the second pressing roller 68 has water absorbency, the liquid component can be guided more efficiently to the lower side where the second pressing roller 68 is installed, and the liquid can be dehydrated.

In the region downstream of the nip portion N between the first pressing roller 67 and the first pressing roller 68, the web W is pressed toward the mesh belt 23a by the first pressing roller 67, so that the liquid component contained in the web W is reduced. Are guided to the lower side of the mesh belt 23a and pass through the mesh.

(Third Embodiment)
FIG. 7 is a vertical sectional view showing a schematic configuration of the sheet forming apparatus Qb according to the third embodiment. In the mesh belt 23b shown in the figure, the inclination of the traveling path on the downstream side of the pressing portion 14b is gentler than that of the mesh belts 23, 23a shown in FIGS. A plurality of pressing roller pairs 71 that oppose each other via the mesh belt 23b are installed at the gently inclined positions. Each pressing roller pair 71 includes a first pressing roller 67b, a second pressing roller 68b, and a pressing force applying member 69b, as in the second embodiment. The plurality of pressing roller pairs 71 sequentially nip and press the web Wb conveyed by the mesh belt 23b.

The pressing roller pair 71d on the downstream side in the traveling direction of the mesh belt 23b is set so as to press the web W with a stronger pressing force than the pressing roller pair 71u on the upstream side. By installing a plurality of pressing roller pairs 71, a clearer and more beautiful watermark pattern can be formed.

(Fourth Embodiment)
FIG. 8 shows a watermark material 96c according to the fourth embodiment. The figure (a) is a top view and the figure (b) is a sectional view. The watermark material 96c is installed by stacking a plurality of resin sheets 93c on the fiber-containing material holding surface of the mesh belt 23c. The lower resin sheet 93L is formed to have a larger area that closes the mesh belt 23c than the upper resin sheet 93h. Further, the upper and lower resin sheets 93h and 93L have different thicknesses. The upper resin sheet 93h is thicker than the lower resin sheet 93L. As a result, the unevenness of the watermark pattern can be formed stepwise, and a three-dimensional watermark pattern can be formed.

(Fifth Embodiment)
FIG. 9 shows a watermark material 96d according to the fifth embodiment. The figure (a) is a top view and the figure (b) is a sectional view. As for the watermark material 96d, the thickness of one resin sheet 93d is not uniform. Resin sheet 93d formed in an elliptical shape. Is formed thinner than the outside. As a result, the outer contour of the watermark pattern can be made clear, and the difference between the irregularities can be emphasized. On the other hand, the inner contour is unclear and can be formed in a vague shape.

Although the deinking process is performed by the deinking device in the paper manufacturing apparatus in the above embodiment, the deinking process can be omitted. Further, although the head box 12 is shown as an overflow type, the fiber-containing material in the reservoir is discharged from the lower part of the reservoir installed above the mesh belt to the lower mesh belt by natural fall or the like. It may be one.

Further, although the suction unit 35 is provided, the suction unit may not be provided. Although the suction unit 35 is installed below the supply unit 19, the suction unit may be installed at the same height as the supply unit. For example, when the mesh belt is installed so as to run obliquely, the installation height of the supply end and the installation height of the suction port can be the same. Further, the suction unit may be installed at a position higher than the supply unit. Therefore, the mesh belt may be installed so as to be inclined at a predetermined angle or more from the horizontal plane.

Further, although the suction unit 35 is installed at the downstream position in the running direction of the mesh belt in the supply region where the fiber-containing material is supplied from the supply unit onto the mesh belt, it is installed at the upstream position in the running direction of the mesh belt. It is also possible to do so. Further, the suction part 35 is provided at a position downstream of the supply end part 19a where the fiber-containing material is supplied from the supply part 19 onto the mesh belt 23 by a predetermined amount in the traveling direction of the mesh belt 23. It may be provided directly below the supply end or may be provided adjacent to the supply end.

Further, the suction member 77 includes a long box-shaped suction box 80, but the suction box has a substantially elliptic tubular shape shown in FIG. 10A, or a trapezoidal tubular shape shown in FIG. 10B. Other shapes such as a ring shape, a triangular tube shape (not shown), a polygonal tube shape, a rod shape, and a spherical shape may be used. The suction port 81 has a bent portion 86 and is formed in a rectangular shape and extends in the width direction H. However, the suction port 81 is punched out like the suction ports 81a and 81b shown in FIGS. 10(a) and (b). It may be formed, and the shape may be an elliptical shape shown in FIG. 3A or a perfect circular shape shown in FIG. 2B, or a triangular shape, a quadrangular shape, a polygonal shape, an irregular shape, or a combination thereof which is not shown. It may be. Further, as shown in FIGS. 9A and 9B, the suction ports 81a and 81b may be divided and provided in plural. The suction base 33 is provided on one side plate 72 of the suction box 80, but may be provided on any other side surface, and the suction base 33a is opened on the bottom surface as shown in FIG. May be provided. Moreover, you may replace with one suction source part 33 and may provide two or more. The bent portion 86 is installed at a position on the downstream side in the traveling direction F of the mesh belt 23 traveling upward, and the cut portion 84a facing the folded portion 86 is on the upstream side in the traveling direction F of the mesh belt 23. Although it is installed in a position, other arrangements different from this may be adopted.

Further, the pressing portion 14 is composed of the pressing roller portion 43, but in addition to this, a pressing belt may be provided. For the pressing belt, a felt, a blanket, or the like that is endlessly formed and has water absorbability can be used. The pressing belt is installed between the mesh belt and the heating drum. The pressing belt is configured to convey the web transferred from the mesh belt and transfer it to the heating drum.

Further, although the paper manufacturing apparatus recycles used paper with water, it may be regenerated without water or with little water to prepare a sheet. In this case, it is possible to prepare a sheet by defibrating waste paper, adding a necessary additive, and heating with a heating unit.

Further, the watermark pattern is shown in the shape of a cherry blossom, a circle, or an ellipse, but the watermark pattern is not limited to this.

Q, Qa, Qb Sheet forming device, 14, 14a, 14b Pressing part, 19 Supplying part, 23, 23a, 23b, 23c, 23d Mesh belt, 35 Suction part, 45, 45a, 45b Pressing roller, 59 Watermarking part, 96 , 96c, 96d watermark material

Claims (6)

An endless mesh belt that runs while holding a fiber-containing material,
A supply unit for supplying a fiber-containing material to the mesh belt,
A pressing portion for pressing the fiber-containing material at a predetermined pressure,
The sheet obtained by pressing the fiber-containing material in the pressing portion, a watermark portion for forming a watermark pattern is provided,
The watermark portion has a predetermined thickness, a watermark material having a watermark pattern shape is provided on the fiber-containing material holding surface of the mesh belt,
The pressing unit is a sheet forming apparatus that presses a fiber-containing material against a mesh belt provided with a watermark material. The sheet forming apparatus according to claim 1, wherein the watermark material can be replaced with a watermark material having a different thickness according to the form of the watermark pattern. The sheet forming apparatus according to claim 1, wherein the traveling speed of the mesh belt can be changed according to the form of the watermark pattern. The pressing unit includes a pressing roller,
The sheet forming apparatus according to any one of claims 1 to 3, wherein a plurality of the pressing rollers are installed in a traveling path of the mesh belt. The sheet forming apparatus according to claim 1, further comprising a suction unit that sucks the fiber-containing material via a mesh belt. The sheet forming apparatus according to any one of claims 1 to 5, wherein the mesh belt runs at a speed of 0.1 m/min to 100 m/min.

Images