JP6414153B2 - Sheet manufacturing apparatus and sheet manufacturing method - Google Patents

Description

  The present invention relates to a sheet manufacturing apparatus and a sheet manufacturing method.

2. Description of the Related Art Conventionally, in a sheet manufacturing apparatus, a so-called wet method is adopted in which a raw material containing fibers is put into water, disaggregated mainly by a mechanical action, and re-made. Such a wet type sheet manufacturing apparatus requires a large amount of water, and the apparatus becomes large. Furthermore, it takes time and effort to maintain the water treatment facility, and energy related to the drying process increases.

Thus, for the purpose of downsizing and energy saving, a dry sheet manufacturing apparatus that uses water as little as possible has been proposed (see, for example, Patent Document 1).

In Patent Document 1, a piece of paper is defibrated in a dry defibrating machine, the fiber is deinked in a cyclone, and the deinked fiber is passed through a small hole screen on the surface of the forming drum, on a mesh belt. And forming a paper.

JP 2012-144819 A

However, in the paper manufacturing apparatus described in Patent Document 1, some fibers adhere to the small hole screen on the surface of the forming drum, causing clogging. Since the fibers do not pass through the clogged small holes and the fibers pass through the clogged small holes, it may be difficult to uniformly disperse the defibrated material on the mesh belt. If the paper is molded in this state, the paper becomes non-uniform in density and thickness. Therefore, the strength may be insufficient or the desired texture of the paper may not be obtained.

SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following aspects or application examples.

SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following aspects or application examples.
One aspect of the sheet manufacturing apparatus according to the present invention, a sorting unit for sorting the defibrated material that has been defibrated,
A loosening part for loosening the defibrated material sorted by the sorting part,
The sorting unit has a first mesh portion having a plurality of opened first openings ,
The loosening portion has a second mesh portion having a plurality of second openings opened at a size equal to or larger than the size of the first opening ,
A mesh size of the first mesh portion and the second mesh portion is 300 μm or more and 5 mm or less.
One aspect of the sheet manufacturing apparatus according to the present invention, a sorting unit for sorting the defibrated material that has been defibrated,
A loosening part for loosening the defibrated material sorted by the sorting part,
The sorting unit includes a cylindrical first net having a plurality of first openings opened in an outer periphery, and the defibrated material is sorted by rotating the first net and the defibrated material. Centrifugal force acts on
The loosening portion has a cylindrical second mesh portion having a plurality of second openings that are open to an outer peripheral portion and have a size equal to or larger than the size of the first opening , and the second mesh portion rotates. The defibrated material is loosened and a centrifugal force acts on the defibrated material.
In the sheet manufacturing apparatus according to the present invention, the sorting unit may pass the defibrated material inside the first mesh unit through the first opening as the first mesh unit rotates. And a residue that does not pass through the first opening,
It is preferable that the loosening portion loosens the passing material inside the second mesh portion and allows the second opening to pass through when the second mesh portion rotates.
In the sheet manufacturing apparatus according to the present invention, the sorting unit is provided on one end side of the first mesh unit, and the first introduction port for introducing the defibrated material into the first mesh unit; It is preferable to have a discharge port that is provided on the other end side of the first net portion and discharges the residue from the inside of the first net portion.
In the sheet manufacturing apparatus according to the present invention, it is preferable that the first net part of the sorting unit and the second net part of the loosening unit are independently rotatable.
In the sheet manufacturing apparatus according to the present invention, it is preferable that the sorting unit rotates faster than the loosening unit.
One aspect of the method for producing a sheet according to the present invention is a sorting step of sorting the defibrated material that has been defibrated,
A step of unraveling the defibrated material sorted by the sorting step,
In the sorting step , using a first net portion having a plurality of opened first openings ,
In the unraveling step , using a second mesh portion having a plurality of second openings opened with a size equal to or larger than the size of the first opening ,
A mesh size of the first mesh portion and the second mesh portion is 300 μm or more and 5 mm or less.

In such a sheet manufacturing apparatus, the defibrated material passes through the first opening of the sorting unit. At this time, a part of the first opening may be in a state where the defibrated material that has passed through the sorting portion is deposited unevenly, for example, due to clogging or the like. Therefore, the defibrated material that has passed through the sorting section is further passed through the second opening. Since the second opening is larger than the size of the first opening, the defibrated material passes through without clogging. Therefore, it can deposit uniformly. In addition, when the defibrated material that has passed through the sorting unit is further sent to the loosening unit, the defibrated material may stick together and become a lump, but the defibrated material that has become a lump by passing through the second opening is loosened. be able to. As a result, the loosening part can deposit the defibrated material with good uniformity on the accumulation part, and such a sheet manufacturing apparatus can manufacture a sheet having strength and good texture.

In the sheet manufacturing apparatus according to the present invention,
The size of the second opening may be larger than the size of the first opening.

In such a sheet manufacturing apparatus, it is possible to reduce the possibility that the defibrated material that has passed through the first opening of the sorting unit remains in the loosening unit. Therefore, in such a sheet manufacturing apparatus, the second
It is possible to prevent the loosening portion from being clogged by a defibrated material that does not pass through the opening (for example, entangled defibrated material).

In the sheet manufacturing apparatus according to the present invention,
A plurality of the second openings of the loosening portion are provided,
The plurality of second openings may have the same size.

In such a sheet manufacturing apparatus, since the plurality of second openings have the same size, they can be uniformly deposited on the deposition portion by passing through the second openings.

In the sheet manufacturing apparatus according to the present invention,
A plurality of the first openings of the sorting unit are provided,
The plurality of first openings may have the same size.

In such a sheet manufacturing apparatus, since the size of the plurality of first openings is the same, the size of the defibrated material that passes through the first opening of the sorting unit can be set to a certain range.

In the sheet manufacturing apparatus according to the present invention,
The sorting section is movable;
The loosening portion is movable;
The sorting unit may move faster than the unwinding unit.

In such a sheet manufacturing apparatus, the sorting unit is more easily clogged than the loosening unit. For this reason, the fiber having a size passing through the first opening may be caught by the clogged portion and may not pass. However, by making the moving speed of the sorting part larger than the loosening part, the centrifugal force increases,
The first opening can be passed. Moreover, it can suppress that the quantity per unit time of the defibrated material which passes 1st opening by clogging reduces.

In the sheet manufacturing apparatus according to the present invention,
The sorting section is movable;
The sorting unit may move faster than the unwinding unit.

In such a sheet manufacturing apparatus, the sorting unit is more easily clogged than the loosening unit. For this reason, the fiber having a size passing through the first opening may be caught by the clogged portion and may not pass. However, by making the moving speed of the sorting part larger than the loosening part, the centrifugal force increases,
The first opening can be passed. In addition, the loosening portion can pass the fiber from the inside of the second opening using an airflow or the like without moving.

In the sheet manufacturing apparatus according to the present invention,
You may provide the supply part which supplies resin which bind | concludes the said defibrated material between the said selection part and the said loosening part.

When supplying the resin to the transport unit connected to the sorting unit on the upstream side in the transport direction of the defibrated material, the resin is applied to the unsorted product (residue that has not passed through the first opening) that has not been sorted in the sorting unit. May adhere. Then, the resin adhering to the unsorted material is not used for the subsequent production of the sheet, and the amount of the resin is wasted. Moreover, even if it supplies resin to the defibrated material after passing through the loosening part, it does not mix uniformly. By supplying the resin between the sorting unit and the unwinding unit, it becomes possible to mix the fiber and the resin in the middle of conveying to the unwinding unit or at the unwinding unit, and the resin is not discarded.

In the sheet manufacturing apparatus according to the present invention,
A defibrating unit for defibrating an object to be defibrated;
And a return channel that returns the defibrated material that has not passed through the sorting unit to the defibrating unit.

In such a sheet manufacturing apparatus, a residue that has not passed through the sorting unit (for example, a residue including undefibrated pieces and a defibrated material larger than the opening of the sorting unit) is defibrated in the defibrating unit. Can be processed. That is, undefibrated pieces can be used for sheet production without being discarded.

In the sheet manufacturing apparatus according to the present invention,
A sorting section that sorts the defibrated material that has been defibrated through the first opening;
A loosening part for loosening the defibrated material that has passed through the sorting part;
A depositing portion on which the defibrated material that has passed through the loosening portion is deposited.

In such a sheet manufacturing apparatus, the defibrated material passes through the first opening of the sorting unit. At this time, a part of the first opening is in a state in which the defibrated material that has passed through the sorting unit is deposited unevenly, for example, due to clogging or the like. Therefore, the defibrated material can be leveled and made uniform by disposing the defibrated material that has passed through the sorting unit. As a result, a sheet having strength and good texture can be produced.

One aspect of the sheet manufacturing method according to the present invention is as follows.
Selecting the defibrated material that has been defibrated by the first opening;
Passing the defibrated material that has passed through the first opening through the second opening having a size equal to or larger than the size of the first opening;
And a step of depositing the defibrated material that has passed through the second opening.

  With such a sheet manufacturing method, a sheet with good texture can be manufactured.

One aspect of the sheet manufacturing method according to the present invention is as follows.
There are a plurality of the first openings and the second openings,
The plurality of first openings have the same size.
The plurality of second openings may have the same size.

One aspect of the sheet manufacturing method according to the present invention is as follows.
The sorting portion having the first opening and the loosening portion having the second opening are movable,
The sorting unit may be moved faster than the unwinding unit.

One aspect of the sheet manufacturing method according to the present invention is as follows.
The step of selecting the defibrated material that has been defibrated by the first opening and the first opening in the second opening
A step of supplying a resin for binding the defibrated material may be provided between the step of passing the defibrated material that has passed through the opening.

One aspect of the sheet manufacturing method according to the present invention is as follows.
You may provide the process of returning the defibrated material which did not pass the said 1st opening to the defibrating part which defibrated the to-be-defibrated material.

The figure which shows typically the sheet manufacturing apparatus which concerns on this embodiment. The figure which shows a defibrated material typically. The figure which shows a defibrated material typically. The figure which shows a non-defibrated piece typically. The perspective view which shows typically the selection part of the sheet manufacturing apparatus which concerns on this embodiment. The top view which expand | deployed the net | network part of the selection part of the sheet manufacturing apparatus which concerns on this embodiment. The perspective view which shows typically the loosening part of the sheet manufacturing apparatus which concerns on this embodiment. The figure which shows typically the sheet manufacturing apparatus which concerns on this embodiment.

DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. The embodiments described below do not unduly limit the contents of the present invention described in the claims. In addition, not all of the configurations described below are essential constituent requirements of the present invention.

1. Sheet Manufacturing Apparatus First, a sheet manufacturing apparatus according to the present embodiment will be described with reference to the drawings. FIG.
These are figures which show typically the sheet manufacturing apparatus 100 which concerns on this embodiment. For convenience, in FIG. 1, the sorting unit 40 and the unwinding unit 60 are simplified.

As shown in FIG. 1, the sheet manufacturing apparatus 100 includes a crushing unit 10, a defibrating unit 20, and a classifying unit 3.
0, a sorting unit 40, a resin supply unit 50, a loosening unit 60, and a sheet forming unit 70.

The crushing part 10 cuts raw materials, such as a pulp sheet and a thrown sheet (for example, A4-size waste paper), in the air into pieces. Although the shape and size of the strip are not particularly limited, for example, it is a strip of several cm square. In the illustrated example, the crushing unit 10 has a crushing blade 11, and the crushing blade 1
1, the charged raw material can be cut. The crushing unit 10 may be provided with an automatic input unit (not shown) for continuously supplying raw materials.

The strips cut by the crushing unit 10 are received by the hopper 5 and then conveyed to the defibrating unit 20 via the first conveying unit 81. The first transport unit 81 communicates with the introduction port 21 of the defibrating unit 20. The shape of the 1st conveyance part 81 and the 2nd-6th conveyance parts 82-86 mentioned later is a tubular shape, for example.

The defibrating unit 20 performs a defibrating process on a strip (a material to be defibrated). The defibrating unit 20 generates the fibers 2 that have been unraveled into a fibrous shape by defibrating the strip. Here, FIG. 2 and FIG. 3 are diagrams schematically showing the unraveled fiber 2.

Here, the “defibration treatment” refers to unraveling a strip formed by binding a plurality of fibers into one fiber. What has passed through the defibrating unit 20 is referred to as “defibrated material”. In the “defibrated material”, in addition to the unraveled fibers 2, resin (resin for binding multiple fibers) separated from the fibers when unraveling the fibers, ink, toner, and bleeding prevention It may also contain ink particles such as materials. In the following description, the “defibrated material” is at least a part of what has passed through the defibrating unit 20, and what is added after passing through the defibrating unit 20 may be mixed. Among those that have been defibrated by the defibrating unit 20, those that are supplied to the sorting unit 40 described later are referred to as “defibrated material that has been defibrated”. The shape of the unraveled fiber 2 is a string shape or a ribbon shape. However, the unraveled fiber 2 exists in an untangled state (independent state) with other unraveled fibers as shown in FIG. 2, but other unraveling fibers as shown in FIG. Entangled with the fibers 2 formed into a lump (so-called “
It may exist in a state of forming a “dama”. The length of the unraveled fiber 2 (the length in the longitudinal direction of the unraveled fiber 2, hereinafter also referred to as “fiber length”) is, for example, 50 μm.
It is 10 mm or less. The “fiber length” is a distance between both ends of a single independent fiber that is pulled as necessary without breaking, and placed in a substantially linear state in that state. The cross-sectional shape of the unraveled fiber 2 is not particularly limited, and may be polygonal, circular, or elliptical. Hereinafter, the description of “fiber” mainly refers to the unraveled fiber.

The “defibrated material” may include “undefibrated pieces”. As shown schematically in FIG. 4, the “undefibrated pieces” are pieces that are not defibrated in a fibrous form and are broken into pieces introduced into the defibrating unit 20. That is, the undefibrated pieces 4 are fine pieces that have been defibrated in the defibrating unit 20 but have not been defibrated. The shape of the undefined piece 4 is not particularly limited, and the size of the undefined piece 4 is, for example, 1 mm or more and 10 mm or less when represented by an opening of a test sieve measured by a sieving method. In addition, “defibrating treatment” means introducing and discharging the defibrated material (strips) into the defibrating unit 20 that is being driven. Defibered pieces 4
Including the case of generating

The defibrating unit 20 separates resin particles adhering to the fine pieces and ink particles such as ink, toner, and a bleeding preventing material from the fibers. The resin particles and the ink particles are discharged from the discharge port 22 together with the defibrated material.

The defibrating unit 20 performs a defibrating process on the strip introduced from the introduction port 21 with a rotary blade. The defibrating unit 20 performs defibration in a dry manner in the air.

The rotational speed of the defibrating unit 20 is 3000 rpm or more and 10,000 rpm or less. Rotational speed is 3
If it is less than 000 rpm, the proportion of the undefined pieces 4 may increase. Rotational speed is 1
If it is greater than 0000 rpm, the proportion of relatively short fibers may increase, causing a reduction in the strength of the manufactured sheet.

The defibrating unit 20 preferably has a mechanism for generating an airflow. In this case, the defibrating unit 20 can suck the fine pieces together with the airflow from the introduction port 21 by the airflow generated by itself, perform the defibrating process, and convey the strip to the discharge port 22. The defibrated material discharged from the discharge port 22 is introduced into the classification unit 30 via the second transport unit 82 as shown in FIG. In addition, when using the defibrating part 20 which does not have an airflow generation mechanism, you may provide the mechanism which generate | occur | produces the airflow which guides a strip to the inlet 21 by external attachment.

The classification unit 30 separates and removes resin particles and ink particles from the defibrated material. As the classification unit 30, an airflow classifier is used. The airflow classifier generates a swirling airflow and separates it by centrifugal force and the size and density of what is classified, and the classification point can be adjusted by adjusting the speed of the airflow and the centrifugal force. Specifically, a cyclone, an elbow jet, an eddy classifier, or the like is used as the classification unit 30. In particular, since the structure of the cyclone is simple, it can be suitably used as the classification unit 30. Below, the case where a cyclone is used as the classification part 30 is demonstrated.

The classification unit 30 includes an inlet 31, a cylindrical part 32 to which the inlet 31 is connected, an inverted conical part 33 located below the cylindrical part 32 and continuing to the cylindrical part 32, and a lower part of the inverted conical part 33. A lower discharge port 34 provided at the center and an upper discharge port 35 provided at the upper center of the cylindrical portion 32 are provided.

In the classifying unit 30, the airflow on which the defibrated material introduced from the inlet 31 is placed has an outer diameter of 100 m.
It changes into a circumferential motion at the cylindrical portion 32 of about m or more and 300 mm or less. Thereby, centrifugal force is applied to the introduced defibrated material, and the first classified material (fiber 2 and undefibrated piece 4) and the second classified material (resin that is smaller than the first classified material and has a lower density). Grains, ink grains). The first classified product is discharged from the lower discharge port 34 and is introduced to the introduction port 46 of the sorting unit 40 through the third transport unit 83. On the other hand, the second classified product is discharged from the upper discharge port 35 to the outside of the classification unit 30 through the fourth transport unit 84. Thus, since the resin particles are discharged to the outside by the classification unit 30,
Even if the resin is supplied by a resin supply unit 50 described later, it is possible to prevent the resin from becoming excessive with respect to the defibrated material.

In addition, although it described that it isolate | separates into a 1st classified product and a 2nd classified product by the classification part 30, it cannot necessarily completely separate. A relatively small or low density of the first classified product may be discharged to the outside together with the second classified product. Among the second classified products, those having a relatively high density and those entangled with the first classified product may be introduced into the sorting unit 40 together with the first classified product. Further, when the raw material is not waste paper but a pulp sheet, since the material corresponding to the second classified product is not included, the classification unit 30 may not be provided as a sheet manufacturing apparatus. Therefore, what is introduced into the sorting unit 40 is not limited to what is classified by the classifying unit 30. Therefore, in this application, what has passed through the defibrating unit 20 and is introduced into the sorting unit 40 is referred to as a “defibrated material that has been defibrated”, and the fibers 2 and the defibrated pieces 4 that have been unwound In addition, a small amount of resin particles or ink particles may be contained.

The sorting unit 40 sorts the defibrated material that has been defibrated in the air into a “passage” that passes through the first opening 42 of the sorting unit 40 and a “residue” that does not pass through the first opening 42. . Hereinafter, the sorting unit 40
Will be described more specifically.

As the sorting unit 40, a sieve is used. Here, FIG. 5 is a perspective view schematically showing the selection unit 40. FIG. 6 is a plan view (development view) in which the mesh portion 41 of the sorting unit 40 is developed.
As shown in FIG. 5, the sorting unit 40 includes a net part 41, disk parts 44 and 45, an introduction port 46, and a discharge port 47. The sorting unit 40 is a rotary sieve in which the mesh unit 41 is rotated around the rotation axis Q by a motor (not shown). When the mesh part 41 rotates, the defibrated material in the mesh part 41 passes through the first opening 42 and does not pass through the first opening 42.

The net 41 of the sorting unit 40 has a plurality of first openings 42. The mesh part 41 is composed of a wire mesh such as a plain weave wire mesh or a welded wire mesh. The net part 41 is a metal net formed in a cylindrical shape, and the inside of the cylinder is hollow. In addition, since it is difficult to make a perfect circle with a cylindrical shape, it is not an accurate circle but includes an ellipse and a polygon.

In addition, in the selection part 40, instead of the net part 41 composed of a metal net, an expanded metal obtained by extending a cut metal plate may be used, or a punching metal in which a hole is formed in the metal plate by a press machine or the like. May be used. In the case of using expanded metal, the first opening 42 is a hole formed by extending a cut formed in a metal plate. When using a punching metal, the 1st opening 42 is a hole formed in the metal plate with the press. Further, the member having the first opening 42 may be made of a material other than metal.

The first opening 42 provided in the net 41 of the sorting unit 40 is the mesh of the net 41. As shown in FIG. 6, the net part 41 has a plurality of linear line parts 43 made of metal, and the first opening 42 is a part surrounded by the line parts 43. The shape of the first opening 42 is not particularly limited as long as the sorting unit 40 functions as a sieve, and may be a polygon, a circle, an ellipse, or the like, but in the example shown in FIG. 6, it is a square. The shapes and sizes of the plurality of first openings 42 are preferably the same. Multiple first
The openings 42 are preferably arranged with good uniformity.

The “shape of the first opening” refers to the planar shape of the first opening 42 when the net 41 is cylindrical, when the net 41 is developed. The above description regarding the first opening is the same for the “second opening” described later.

The mesh opening of the mesh part 41 of the sorting part 40 is preferably 300 μm or more and 2000 μm or less. When the mesh opening is smaller than 300 μm, the fiber length is short, so that the number of intersections between the fibers increases. Since the number of fibers that bind the fibers to each other is limited, there may be places where the fibers are not bound to each other, and the strength of the manufactured sheet may be reduced. If the mesh opening is larger than 2000 μm, there is a high possibility that undefibrated pieces 4 that have not been defibrated pass through the first opening 42, and the texture of the manufactured sheet may deteriorate.

In addition, as shown in FIG. 6, “mesh” is a size A between adjacent line portions 43 when the net portion 41 is expanded. When the shape of the first opening 42 is a square, the mesh opening is the length of one side of the square.

The disc parts 44 and 45 of the sorting part 40 are arranged in two openings formed at the end parts by making the net part 41 cylindrical. The disc portion 44 is provided with an inlet 46 for introducing the defibrated material, and the disc portion 45 is provided with an outlet 47 for discharging the residue. When the sorting unit 40 rotates, the mesh unit 41 rotates, and the disk units 44 and 45, the introduction port 46, and the discharge port 47 do not rotate. The disc parts 44 and 45 are in contact with the end part of the net part 41 so that the net part 41 can rotate. The disc parts 44 and 45 and the net part 41 are in contact with each other without any gap, thereby preventing the defibrated material in the net part 41 from leaking outside. The positions of the introduction port 46 and the discharge port 47 are not particularly limited, but in the example shown in FIG. 5, the introduction port 46 and the discharge port 47 are provided at positions shifted from the rotation axis Q of the sorting unit 40. In particular,
In the example shown in FIG. 5, the introduction port 46 is provided vertically above the rotation axis Q and below the uppermost vertical portion of the net 41. The discharge port 47 is provided below the rotation axis Q in the vertical direction and above the lowermost part of the net 41 in the vertical direction. A first opening 42 is formed inside the net 41.
There are defibrated material that does not pass through. Since the introduction port 46 is positioned vertically above the rotation axis Q, the defibrated material can be supplied to the space where the defibrated material is not accumulated, so that the defibrated material does not stagnate at the introduction port 46. . In addition, the defibrated material that cannot pass through the first opening 42 accumulates in the lower part in the vertical direction, so that it is easy to discharge by providing the outlet 47 below the rotation axis Q in the vertical direction. The diameters of the introduction port 46 and the discharge port 47 are smaller than the radius of the cylinder of the net part 41. Thereby, there is not too much defibrated material supplied from the inlet 46, and the inside of the net part 41 is not filled with the defibrated material. In addition, the defibrated material is also prevented from being discharged from the discharge port 47 without being sufficiently selected.

The net 41 of the sorting unit 40 is movable. In FIG. 5, the net 41 can rotate around the rotation axis Q. As the net portion 41 rotates, the first opening 42 also rotates. The rotation speed of the net part 41 is, for example, 50 rpm or more and 800 rpm or less. The moving speed of the web portion 41 of the sorting section 40 is greater than the moving speed of the web portion 61 of the loosening portion 60 is preferred. That is, the net 41 of the sorting unit 40 rotates faster than the net 61 of the loosening unit 60. Here, “movement speed” can be rephrased as the rotation speed (rotation speed) of the net portions 41 and 61 when the net portions 41 and 61 rotate. That is, the rotation speed (rotation speed) of the mesh section 41 of the sorting section 40 is larger than the rotation speed (rotation speed) of the mesh section 61 of the loosening section 60. In addition, the net | network part 41 may move not only in rotation but in a horizontal direction or a vertical direction. Therefore, “movement” includes rotation, linear movement, pendulum-like reciprocation, and the like, and “movement speed” includes movement speed, frequency, and frequency in each direction. The description regarding “movement” is the same for “second opening” described later.

In a state where the sorting unit 40 rotates about the rotation axis Q, the defibrated material that has been defibrated is introduced into the sorting unit 40 from the introduction port 46. And the 1st opening 4 is obtained by the net | network part 41 rotating.
What passed 2 is discharged out of the sorting section as a passing material (sorted material). As a passing thing,
Fibers shorter than the size of the opening of the first opening 42 are mainly used. Moreover, what did not pass the 1st opening 42 is discharged | emitted from the discharge port 47, without passing through the 1st opening 42 as a residue (non-sorting thing). The residue is a fiber having a length that cannot pass through the first opening 42, an undefined piece 4, or a dama. In this way, the sorting unit 40 can sort fibers (passed material) shorter than a certain length from the defibrated material that has been defibrated by the mesh unit 41 having the first opening 42.

As shown in FIG. 1, the residue that has not passed through the first opening 42 of the sorting unit 40 is discharged from the outlet 47.
Is then transported to the hopper 5 via the fifth transport unit 85 as a return flow path and returned to the defibrating unit 20 again.

The passing material that has passed through the first opening 42 of the sorting unit 40 is received by the hopper 5 and then the sixth transport unit 8.
6 is conveyed to the introduction port 66 of the loosening unit 60. The sixth transport unit 86 is provided with a supply port 51 for supplying a resin that binds fibers (bonds defibrated materials).

The resin supply unit 50 supplies resin in the air from the supply port 51 to the sixth transport unit 86. That is, the resin supply unit 50 supplies the resin to the path (from between the selection unit 40 and the loosening unit 60) where the passing material that has passed through the first opening 42 travels from the selection unit 40 to the loosening unit 60. Resin supply unit 50
Although it will not specifically limit if resin can be supplied to the 6th conveyance part 86, A screw feeder, a circle feeder, etc. are used.

The mechanism for mixing the defibrated material and the resin is not limited to the turbo blower, and may be agitated by a blade rotating at high speed like a juicer mixer, or the container may be rotated like a V-type mixer. It may be used.

The resin supplied from the resin supply unit 50 is a resin for binding a plurality of fibers. When the resin is supplied to the sixth transport unit 86, the plurality of fibers are not bound. The resin is cured when passing through a sheet forming portion 70 described later, and binds a plurality of fibers.

The resin supplied from the resin supply unit 50 is a thermoplastic resin or a thermosetting resin, and is an AS resin, ABS resin, polypropylene, polyethylene, polyvinyl chloride, polystyrene, acrylic resin, polyester resin, polyethylene terephthalate, polyphenylene ether, Examples include polybutylene terephthalate, nylon, polyamide, polycarbonate, polyacetal, polyphenylene sulfide, and polyetheretherketone. These resins may be used alone or in combination.

The resin supplied from the resin supply unit 50 may be fibrous or powdery. When the resin is fibrous, the fiber length of the resin is preferably equal to or less than the fiber length of the fiber 2. Specifically, the fiber length of the resin is 3 mm or less, more preferably 2 mm or less. If the fiber length of the resin is greater than 3 mm, it may not pass through the second opening 62 of the loosening part 60,
Moreover, it may be difficult to mix with the fibers 2 with good uniformity. When the resin is powdery, the particle size of the resin is 1 μm or more and 50 μm or less, more preferably 2 μm or more and 20 μm or less.
When the particle size of the resin is smaller than 1 μm, the binding force for binding the fibers 2 may be reduced. If the particle size of the resin is larger than 20 μm, it may be difficult to mix with the fibers 2 with good uniformity, and the adhesion to the fibers 2 may be reduced and the fibers 2 may be separated.

The amount of resin supplied from the resin supply unit 50 is appropriately set according to the type of sheet to be manufactured. In addition to the resin that binds the fibers 2, a colorant for coloring the fibers 2 and an aggregation preventing material for preventing the aggregation of the fibers 2 are supplied according to the type of sheet to be produced. Also good. The supplied resin is mixed with the passing material that has passed through the first opening 42 by a mixing unit (not shown) provided in the sixth transport unit 86. The mixing unit generates an air flow for conveying the passing material and the resin to the loosening unit 60 while mixing the passing material and the resin. When the passing material passes through the sixth transport unit 86, it may be entangled with each other as shown in FIG.

The loosening unit 60 loosens tangled passing objects. Further, the loosening unit 60 is connected to the resin supply unit 5.
When the resin supplied from 0 is fibrous, the intertwined resin is loosened. In addition, loosening part 6
0 deposits the passing material and resin uniformly on the depositing section 72 described later. In other words, the term “unwind” includes the action of breaking up intertwined things and the action of depositing them uniformly. If there is no entanglement, the film is uniformly deposited.

As the loosening part 60, a sieve is used. Here, FIG. 7 is a perspective view schematically showing the loosening portion 60. As shown in FIG. 7, the loosening unit 60 is a rotary sieve that can be rotated by a motor (not shown). Here, the “sieving” used as the loosening unit 60 may not have a function of selecting a specific object. That is, the “sieving” used as the loosening part 60 means that the mesh part 61 having a plurality of second openings 62 is provided. The loosening part 60 is a defibrated material introduced into the loosening part 60. All of the resin and the second opening 6
2 may be discharged to the outside.

The loosening part 60 includes a net part 61, disk parts 64 and 65, and an introduction port 66. The difference in configuration between the loosening unit 60 and the sorting unit 40 is that it does not have a discharge port (a portion corresponding to the discharge port 47 of the sorting unit 40). Hereinafter, in the description of the loosening unit 60, the description of the portion having the same shape as the sorting unit 40 is omitted.

The mesh part 61 of the loosening part 60 has a plurality of second openings 62. The size of the second opening 62 is greater than or equal to the size of the first opening 42. That is, the size of the second opening 62 is equal to the first opening 4.
It is the same as the size of 2 or larger than the size of the first opening 42. However, the upper limit of the size of the second opening 62 is 5 mm. By setting the size of the second opening 62 to 5 mm or less, it is possible to loosen and allow the fibers to get entangled without passing them.

Since the passing material that has passed through the first opening 42 can pass through the second opening 62, the second opening 62 is not clogged. In addition, even if there are fibers or resin entangled in the sixth transport unit 86 after passing through the first opening 42, they are loosened when passing through the second opening 62. Therefore, the fibers and the resin that have passed through the second opening 62 are deposited on the deposition section 72 described later with a uniform thickness and density. When the first opening 42 and the second opening 62 have the same size, the net 41 and the net 6
1 can use the same thing. When the second opening 62 is made larger than the first opening 42, the possibility of clogging at the second opening 62 can be reduced. Since all or most of the passing material introduced into the loosening portion 60 passes through the second opening 62, there is almost no residue remaining in the loosening portion 60 without passing through the second opening 62. Therefore, the loosening part 60 does not have a portion corresponding to the discharge port 47 of the sorting part 40 and does not have a flow path for returning the defibrated material that does not pass through the loosening part 60 to the defibrating part 20. That is, it does not have a flow path which connects the loosening part 60 and the defibrating part 20.

The “size of the opening” is the area of the opening in a state in which the nets 41 and 61 are unfolded when the nets 41 and 61 are cylindrical as shown in FIGS. Specifically, when the net part 41 is formed of a wire mesh (more specifically, when the shapes of the openings 42 and 62 are square).
“The size of the opening” may be an opening of the mesh portions 41 and 61. Also, the opening 42,
When the shape of 62 is circular, the “size of the opening” may be the diameter of the openings 42 and 62. In the case of other than a square or circle, the dimension of the largest dimension may be used. In addition,
“More than the size of the opening” means that the size of the opening is the same or larger.

The net part 61 of the loosening part 60 is movable. Specifically, the net 61 is cylindrical as shown in FIG. 7 and rotates about the rotation axis Q. As the net 61 rotates, the second
The opening 62 also rotates. The rotation speed (rotation speed) of the net 61 is, for example, 30 rpm or more and 600 r
pm or less. That is, the rotation speed (movement speed) of the mesh unit 41 is higher than the rotation speed (movement speed) of the mesh unit 61. Since the net | network part 41 contains the defibrated material larger than the magnitude | size of an opening, the passage of the defibrated material smaller than the magnitude | size of an opening may be inhibited. Therefore, it is easier for the mesh portion 41 to pass through the first opening 42 when the rotation speed is higher. On the other hand, since the size of the opening of the mesh portion 61 is equal to or larger than the size of the opening of the mesh portion 41, the defibrated material easily passes through the second opening 62 even if the rotational speed is slower than that of the mesh portion 41.

In a state where the loosening part 60 rotates about the rotation axis Q, the mixture of the passing material (fiber) and the resin that has passed through the sorting part 40 is introduced into the loosening part 60 from the introduction port 66. Loosening part 6
The mixture introduced into 0 moves to the mesh part 61 side by centrifugal force. As described above, the mixture introduced into the loosening part 60 may contain entangled fibers and resin, and the entangled fibers and resin are loosened in the air by the rotating mesh part 61. Then, the loosened fiber or resin passes through the second opening 62. The fibers and resin that have passed through the second opening 62 are:
Passing through the air, it is uniformly deposited on the deposition part 72 described later.

Note that “untangling the entangled fibers” means a case where the entangled fibers are completely unraveled (when all the fibers are unraveled) and an entangled fiber that can pass through the second opening 62. To loosen a part of The same applies to the meaning of “releasing entangled resin”. In addition, if it is the magnitude | size of the opening of the 2nd opening 62, even if the defibrated material which passes through it is intertwined, it does not become a problem as a texture. Further, “uniformly deposited” refers to a state in which deposited deposits are deposited with the same thickness and the same density. However, since not all the deposits are manufactured as a sheet, it is sufficient that the portion to be a sheet is uniform. “Non-uniform deposition” refers to a state in which deposition is not uniform.

The defibrated material and the resin that have passed through the second opening 62 of the loosening part 60 are deposited on the deposition part 72 of the sheet forming part 70. As shown in FIG. 1, the sheet forming unit 70 includes a stacking unit 72, a stretching roller 74, a heater roller 76, a tension roller 77, and a winding roller 7.
8. The sheet forming unit 70 forms a sheet using the defibrated material and the resin that have passed through the loosening unit 60. Hereinafter, the sheet forming unit 70 will be specifically described.

The depositing portion 72 of the sheet forming portion 70 receives and deposits the defibrated material and the resin that have passed through the second opening 62 of the loosening portion 60. The deposition part 72 is located below the loosening part 60. The accumulation part 72 receives the defibrated material and the resin that have passed through the second opening 62, and is, for example, a mesh belt. A mesh stretched by a stretch roller 74 is formed on the mesh belt. The deposition unit 72 moves as the stretching roller 74 rotates. As the deposit 72 moves continuously, the defibrated material and the resin continuously fall from the loosening portion 60, thereby forming a web having a uniform thickness on the deposit 72.

Although not shown in the figure, a suction device may be provided that is located below the unwinding unit 60 via the deposition unit 72 and generates a downward airflow (an airflow from the unwinding unit 60 toward the deposition unit 72). . As a result, the defibrated material and the resin dispersed in the air can be sucked, and the discharging speed from the loosening unit 60 can be increased. As a result, the sheet manufacturing apparatus 1
The productivity of 00 can be increased. Further, the suction device can form a downflow in the defibrated material and the resin dropping path, and can prevent the defibrated material and the resin from being entangled during the dropping.

The material of the mesh belt used as the accumulation part 72 of the sheet forming part 70 is a metal, a resin, a nonwoven fabric, or the like. The hole diameter (diameter) of the mesh belt is, for example, 60 μm or more and 250 μm
m or less. If the hole diameter of the mesh belt is smaller than 60 μm, it may be difficult to form a stable airflow by the suction device. Mesh belt hole diameter is 250
When it is larger than μm, the fibers may enter between the meshes, and the unevenness of the surface of the manufactured sheet may become large.

The defibrated material and the resin deposited on the deposition unit 72 of the sheet forming unit 70 are heated and pressurized by passing through the heater roller 76 as the deposition unit 72 moves. By heating, the resin functions as a binder to bind the fibers together, is thinned by pressurization, and further passes through a calendar roller (not shown) to smooth the surface, whereby the sheet P is formed. In the illustrated example, the sheet P is wound up by a winding roller 78.

  Thus, the sheet P can be manufactured.

  The sheet manufacturing apparatus 100 has the following effects.

When the defibrated material passes through the first opening 42 of the sorting unit 40, the defibrated material that cannot pass through the first opening 42 is sorted. Then, the defibrated material having a size passing through the first opening 42 is arranged. However, since the first opening 42 is clogged and cannot pass therethrough, the defibrated material that has passed through has a thickness,
The density is deposited unevenly. Therefore, the second opening 62 of the loosening part 60 is passed. Since the opening size of the second opening 62 is equal to or larger than the opening size of the first opening 42, the defibrated material that has passed through the first opening 42 is not clogged by the second opening 62. Therefore, the defibrated material that has passed through the second opening 62 can be deposited on the deposition portion 72 with a uniform thickness and density. Further, the defibrated material gathered in the process of being conveyed from the sorting unit 40 to the loosening unit 60 can be loosened by passing through the second opening 62. As a result, the sheet manufacturing apparatus 100 can manufacture a sheet having high strength and good texture. In addition, the effect of this application becomes a particularly favorable effect in the paper mentioned later. In the conventional paper manufacturing apparatus, it is impossible to deposit with a uniform thickness and density, and thus it has been impossible to manufacture a thin and high-strength molded product required for paper. In the present application, in the case of paper, it is thin, has high strength, can be satisfactorily produced, and solves an unsolved problem in a dry paper production apparatus. The effect is exhibited in paper, but the non-woven fabric described later is not easily torn off, but has a good appearance.

Here, Patent Document 1 has only one of the sorting unit 40 or the loosening unit 60 of the present application.
If there is only one, it is in a state of passing through the sorting section 40 of the present application, and non-uniform deposition occurs due to clogging of the openings. Therefore, a sheet having a better configuration can be manufactured. In Patent Document 1, there are two forming drums, but those that pass through one opening are not sent to the other, and each does not have a function of a sorting part and a loosening part.

In addition, it is assumed that two sorting units 40 are used and the downstream opening of the sorting unit is smaller than the upstream opening in the conveyance direction of the defibrated material. In this case, the clogging of the openings still occurs in the downstream selection section, resulting in uneven deposition. Therefore, even if two sorting parts are provided, there is no effect, and a loosening part having an effect of loosening and depositing uniformly is required on the downstream side.

The “texture” refers to the geology of the sheet. Specifically, as shown in the following experimental example, the degree (degree) of the shade difference seen when light is applied from the back of the sheet. That means. That is, the “sheet with good texture” refers to a sheet having a small difference in shading.

Here, it is also conceivable to increase the rotational speed of the defibrating unit to reduce the ratio of the undefibrated pieces 4. However, increasing the rotational speed of the defibrating unit increases the energy consumed in the defibrating unit (defibrating energy), which is not preferable from the viewpoint of energy saving. Further, when the rotational speed of the defibrating part is increased, the proportion of short fibers increases, the bond strength of the defibrated material becomes weak, and the strength of the sheet may decrease. In the sheet manufacturing apparatus 100, it is possible to prevent a decrease in sheet strength due to short fibers while suppressing defibration energy.

The “sheet strength” is the tensile strength of the sheet, and specifically, the strength evaluated using a tensile strength tester as shown in the following experimental examples.

In the sheet manufacturing apparatus 100, since the size of the second opening 62 is larger than the size of the first opening 42, the possibility of remaining in the loosening unit 60 can be reduced. Therefore, the loosening portion 60 can be prevented from being clogged and deposited with a uniform thickness and density.

In the sheet manufacturing apparatus 100, the plurality of first openings 42 have the same size, and the plurality of second openings 62 have the same size. When the plurality of first openings 42 have the same size, the first openings 4
Since the passing material passing through 2 is selected under the same conditions, the size of the passing material is less varied. It is desirable that the shapes of the plurality of first openings 42 be the same, but they may be the same size even if they are different. By making the size of the plurality of second openings 62 the same, fibers and resins passing through the second openings 62 can be uniformly deposited on the deposition portion 72. If the plurality of second openings 62 are arranged at equal intervals, they can be deposited more uniformly.

In the sheet manufacturing apparatus 100, the moving speed of the sorting unit 40 is higher than the moving speed of the loosening unit 60. The amount of defibrated material discharged through the first opening 42 of the sorting unit 40 per unit time and the amount of defibrated material discharged through the second opening 62 of the loosening unit 60 per unit time In order to make the discharge amount the same (closer), it is preferable to increase the processing speed of the sorting unit 40 by increasing the moving speed of the sorting unit 40. In particular, the size of the second opening 62 is the first opening 4.
When the size is larger than 2, it is more preferable to make the moving speed of the sorting unit 40 larger than the moving speed of the loosening unit 60. The sorting unit 40 can be easily sorted by moving. On the other hand, the loosening portion 60 is intended to loosen or deposit uniformly by allowing the fibers to pass therethrough, and does not need to move. In that case, the fiber passes through the second opening 62 using, for example, an air flow.

The sheet manufacturing apparatus 100 includes a resin supply unit 50 that supplies resin to a sixth transport unit 86 that connects the sorting unit 40 and the loosening unit 60. Therefore, even if the defibrated material and the resin are entangled in the sixth transport unit 86, the defibrated material and the resin entangled by the unraveling unit 60 can be loosened, and the defibrated material and the resin are uniformly distributed on the deposition unit 72. It can be deposited with good quality. In addition, when the resin is supplied to the third transport unit 83 upstream of the sorting unit 40, the resin adhering to the residue that has not passed through the first opening 42 in the sorting unit 40 is not used for manufacturing the sheet. Therefore, not only is the resin wasted, but the amount of resin used for manufacturing the sheet is reduced and the strength of the sheet is insufficient.

In the sheet manufacturing apparatus 100, a defibrating unit 20 that defibrates the material to be defibrated, a fifth transport unit (return channel) 85 that returns the residue that has not passed through the sorting unit 40 to the defibrating unit 20, It has. Accordingly, the defibrated material that has not passed through the first opening 42 in the sorting unit 40 can be defibrated in the defibrating unit 20. That is, the residue can be used for sheet production without being discarded.

Note that the sheet manufacturing apparatus 100 may not have the flow path 85 for returning the defibrated material that does not pass through the loosening unit 60 to the defibrating unit 20. In such a sheet manufacturing apparatus 100, the loosening unit 60
Since there is almost no defibrated material that does not pass through, the flow path returning to the defibrating unit 20 can be eliminated, and the sheet manufacturing apparatus 100 can be downsized.

2. Experimental Example An experimental example is shown below to describe the present invention more specifically. The present invention is not limited by the following experimental examples.

2. Preparation of sample Example 1
As the raw material, A4-size PPC (Plain Paper Copier) paper was used. As the sheet manufacturing apparatus, a sheet manufacturing apparatus 100 as shown in FIG. 1 was used.

Before putting the PPC paper into the defibrating unit 20, 6 m in the crushing unit (shredder) 10
Cut into m × 14 mm pieces of paper. As the defibrating unit 20, an impeller mill 250 (manufactured by Seishin Enterprise Co., Ltd.) was used. The rotational speed of the impeller mill 250 was set to 5000 rpm, and the cut paper piece was defibrated to generate a defibrated material. The defibrated material is classified into a classification unit (cyclone) 30.
Then, it is conveyed to the sorting unit 40.

As the selection unit 40, a rotary sieve was used. As the mesh part 41 of the sorting part 40, the mesh opening was 970 μm, the wire diameter was 300 μm, the outer diameter was 220 mm, and the rotation speed was 220 rpm.

Resin was added to the material that passed through the first opening 42 of the sorting unit 40. Specifically, a material 1 in which a powdery resin (polyester) having an average particle diameter D50 = 8.2 μm is passed through the first opening 42.
15 parts by weight was added to 00 parts by weight. The material that passed through the first opening 42 and the resin were mixed by a turbo fan blower provided in the sixth transport unit 86.

As the loosening part 60, a rotary sieve having the same shape and size as the sieve used as the sorting part 40 was used except that the discharge port 47 was not provided. That is, the mesh part 61 of the loosening part 60.
As an example, the aperture was 970 μm, the wire diameter was 300 μm, and the outer diameter was 220 mm. The rotation speed was 150 rpm.

The defibrated material and the resin that passed through the loosening unit 60 and were deposited on the deposition unit 72 were heated and pressed by the heater roller 76 to form a thin layer sheet (paper). Heater roller 76
The temperature of the paper after passing through was 140 ° C., and the pressure applied by the heater roller 76 was about 30 kgf / cm ² . The thickness of the formed paper was about 90 μm.

2.1.2. Example 2
Paper was manufactured in the same process as in Example 1 (with the same sheet manufacturing apparatus) except that the paper manufactured in Example 1 was used as a raw material.

2.1.3. Comparative Example 1
Paper was manufactured using a sheet manufacturing apparatus that does not include the sorting unit 40. The other parts (except that the selection unit 40 is not provided) are the same as those in the sheet manufacturing apparatus used in Example 1.

2. Comparative Example 2
Paper was manufactured in the same process as Comparative Example 1 (with the same sheet manufacturing apparatus) except that the rotational speed of the defibrating unit 20 was set to 12000 rpm.

2.2. Evaluation Results The texture and tensile strength of the papers of Examples 1 and 2 and Comparative Examples 1 and 2 were evaluated. The texture is
The difference in shading seen when light was applied from the back of the paper was visually evaluated. Tensile strength was measured using a tensile strength tester so that a test piece (paper piece) having a length of 150 mm and a width of 15 mm had a span length of 100 mm. The evaluation results of the texture and tensile strength are shown in Table 1. Furthermore, the defibrating unit 20
Table 1 shows the energy (defibration energy) consumed in the defibrating process.

As shown in Table 1, the papers of Examples 1 and 2 were found to have a substantially uniform density and good texture in the texture evaluation. Moreover, the tensile strength of the paper of Examples 1 and 2 is 4
It was 5 MPa or more and was found to have high strength. In Examples 1 and 2,
The clogging of the net portion 61 of the loosening portion 60 did not occur. From the results of Example 2, the paper made from the paper produced by this sheet manufacturing apparatus also satisfies the performance as paper. Therefore, the paper created by this apparatus can be used repeatedly without using commercially available paper.

In Comparative Example 1, as the apparatus continues to operate, undefibrated pieces that have not been defibrated in the defibrating unit and entangled defibrated material stay in the loosening unit, and clogging occurs. did. As a result, paper could not be produced continuously for a long time. The paper produced in the early days of operation
Although the paper had almost the same texture as that of Example 1, the paper produced after clogging was confirmed to deteriorate in the texture.

Also in Comparative Example 2, clogging occurred in the loosening part while the operation of the apparatus was continued. However, the degree of clogging was lighter than that of Comparative Example 1. Similar to Comparative Example 1, it was confirmed that paper produced after clogging was deteriorated in texture. However, the degree of shading unevenness was better than that of Comparative Example 1.

The tensile strength of the paper of Comparative Example 2 was as low as 11 MPa. This is considered to be because in Comparative Example 2, the rate at which the defibrated portion was high and the defibrated material with a short fiber length was generated increased. Here, Table 2 shows the fiber length distribution of the defibrated material after passing through the defibrating part and before being introduced into the loosening part. Specifically, Table 2 shows the fiber length distribution of 20,000 defibrated material having a fiber length of 50 μm or more, as measured by Fiber Tester (L & W).
From Table 2, it was found that in Comparative Example 2, the fiber length of the defibrated material was shorter than that in Example 1.

The present invention includes configurations that are substantially the same as the configurations described in the embodiments (configurations that have the same functions, methods, and results, or configurations that have the same objects and effects). In addition, the invention includes a configuration in which a non-essential part of the configuration described in the embodiment is replaced. In addition, the present invention includes a configuration that exhibits the same operational effects as the configuration described in the embodiment or a configuration that can achieve the same object. Further, the invention includes a configuration in which a known technique is added to the configuration described in the embodiment.

In addition, the sheet manufactured by the sheet manufacturing apparatus 100 mainly indicates a sheet shape. However, it is not limited to a sheet shape, and may be a board shape or a web shape. The sheet in this specification is divided into paper and non-woven fabric. Paper includes pulp and waste paper as a raw material, and is formed into a thin sheet. Recording paper for the purpose of writing and printing, wallpaper, wrapping paper, colored paper,
Including drawing paper and Kent paper. Nonwoven fabric is thicker than paper or low in strength, and includes general nonwoven fabric, fiber board, tissue paper, kitchen paper, cleaner, filter, liquid absorbent material, sound absorber, cushioning material, mat, and the like. As raw materials, plant fibers such as cellulose, PET (polyethylene terephthalate), chemical fibers such as polyester, wool,
Animal fibers such as silk may be used.

Although the net part 41 of the sorting part 40 and the net part 61 of the loosening part 60 are cylindrical, they may be planar. A plurality of openings may be opened on the flat plate, or a planar mesh may be used.

In addition, although not shown, a moisture sprayer for spraying and adding moisture to the deposit deposited in the deposition unit 72 may be provided. Thereby, the intensity | strength of the hydrogen bond at the time of shape | molding the sheet | seat P can be made high. The spray addition of moisture is performed on the deposit before passing through the heater roller 76. Starch, PVA (polyvinyl alcohol), or the like may be added to the moisture sprayed by the moisture sprayer. Thereby, the strength of the sheet P can be further increased.

In the above example, the form in which the sheet P is taken up by the take-up roller 78 has been described. However, the sheet P may be cut into a desired size by a cutting machine (not shown) and stacked on a stacker or the like.

The sheet manufacturing apparatus 100 may not include the crushing unit 10 as shown in FIG. For example,
If the raw material is roughly crushed with an existing shredder or the like, the crushing portion 10 is not necessary.

As shown in FIG. 8, the sheet manufacturing apparatus 100 may not include the crushing unit 10 and the defibrating unit 20. If a defibrated material that has been defibrated by a defibrating device different from the sheet manufacturing apparatus 100 is used as a raw material, the crushing unit 10 and the defibrating unit 20 are not necessary. Therefore, the “defibrated material subjected to the defibrating process” includes a defibrated material processed in a defibrating unit that is not mounted on the sheet manufacturing apparatus 100.

The 5th conveyance part 85 as a return channel may not be. The residue may be collected and discarded without returning to the defibrating unit 20. Further, if the defibrating unit 20 has a performance such that no residue is produced, the fifth transport unit 85 may be omitted.

In the present application, terms such as “uniform”, “same”, “equally spaced”, etc. mean that the density, distance, dimensions, etc. are equal. Although it is desirable that these are equal, it is difficult to make them completely equal. Therefore, it is assumed that the values do not become equal due to accumulation of errors and variations.

Here, when used paper is a material, a defibrating unit for defibrating the used paper, a sorting unit having a first opening for sorting the defibrated material that has been defibrated by the defibrating unit, and the first opening A second opening having a size greater than or equal to the size of the defibrated material that passes through the defibrated material and loosens the defibrated material, and a deposited portion on which the defibrated material that has passed through the deflated material is deposited The used paper recycling apparatus is provided. Note that the waste paper mainly refers to printed paper, but may include paper that has not been printed but has passed through a printing apparatus.

2 ... fiber, 4 ... undefibrated pieces, 5,6 ... hopper, 10 ... crushing part, 11 ... crushing blade, 20 ... defibration part, 21 ... introduction port, 22 ... discharge port, 30 ... classification part, 31 ... Introduction port, 32 ... Cylindrical part, 33 ...
Inverted conical portion, 34 ... lower discharge port, 35 ... upper discharge port, 40 ... sorting portion, 41 ... mesh portion, 42 ... first opening, 43 ... line portion, 44, 45 ... disc portion, 46 ... introduction port, 47 ... discharge port, 50 ... resin supply part, 51 ... supply port, 60 ... loosening part, 61 ... net part, 62 ... second opening, 64, 65 ... disc part, 66 ... introduction port, 70 ... sheet molding part 72: Deposition unit, 74: Stretching roller, 76 ... Heater roller, 77 ... Tension roller, 78 ... Winding roller, 81 ... First transport unit, 82 ... Second transport unit, 83 ... Third transport unit, 84 ... 4th conveyance part, 85 ... 5th conveyance part, 86
... Sixth transport unit, 100 ... Sheet manufacturing apparatus

Claims (7)

A sorting section for sorting the defibrated material that has been defibrated;
A loosening part for loosening the defibrated material sorted by the sorting part,
The sorting unit has a first mesh portion having a plurality of opened first openings ,
The loosening portion has a second mesh portion having a plurality of second openings opened at a size equal to or larger than the size of the first opening ,
The sheet manufacturing apparatus according to claim 1, wherein the first mesh portion and the second mesh portion have openings of 300 μm or more and 5 mm or less. A sorting section for sorting the defibrated material that has been defibrated;
A loosening part for loosening the defibrated material sorted by the sorting part,
The sorting unit includes a cylindrical first net having a plurality of first openings opened in an outer periphery, and the defibrated material is sorted by rotating the first net and the defibrated material. Centrifugal force acts on
The loosening portion has a cylindrical second mesh portion having a plurality of second openings that are open to an outer peripheral portion and have a size equal to or larger than the size of the first opening , and the second mesh portion rotates. A sheet manufacturing apparatus, wherein the defibrated material is loosened and a centrifugal force acts on the defibrated material. The sorting section passes through the defibrated material inside the first mesh section through the first opening and the defibrated material inside the first mesh section as the first mesh section rotates. Sorting into residues that do not
3. The sheet manufacturing apparatus according to claim 2, wherein the loosening portion loosens the passing material inside the second mesh portion and allows the second opening to pass through the second opening when the second mesh portion rotates.   The sorting section is provided on one end side of the first mesh section, and is provided on a first introduction port for introducing the defibrated material into the first mesh section and on the other end side of the first mesh section. The sheet manufacturing apparatus according to claim 3, further comprising a discharge port that is provided and discharges the residue from the inside of the first net portion.   The sheet manufacturing apparatus according to any one of claims 2 to 4, wherein the first mesh portion of the sorting portion and the second mesh portion of the loosening portion are independently rotatable.   The sheet manufacturing apparatus according to claim 1, wherein the sorting unit rotates faster than the loosening unit. A sorting process for sorting the defibrated material that has been defibrated;
A step of unraveling the defibrated material sorted by the sorting step,
In the sorting step , using a first net portion having a plurality of opened first openings ,
In the unraveling step , using a second mesh portion having a plurality of second openings opened with a size equal to or larger than the size of the first opening ,
A method for manufacturing a sheet, wherein the mesh openings of the first mesh portion and the second mesh portion are 300 μm or more and 5 mm or less.