JP2000328479A - Apparatus for recoverying broke - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve problem such that, up to now, broke generated at a paper- making machine in a paper mill is fed to a pulper and regenerated to pulp which is a raw material for paper, but a large amount of man power are required to gather the broke and feed the broke to a pulper when a large amount of the broke is generated, as the broke generated at the dryer part is bulky and scatter in a wide range. SOLUTION: Spoilage is carried to a pulper by installing a canvas conveyor on the whole surface of the pit bottom of a base where a dryer part of a paper making machine is installed, winders W1 and W2 of the canvas conveyor at the entrance and exit of the dryer part and reciprocally running the canvas conveyor by the winders W1 and W2. Thus, the broke is recovered by a conveyor and man powers are not required. In addition, the maintenance cost of the device for recovering broke is remarkably inexpensive, as the canvas which is periodically exchanged and disposed can be reused as the conveyor as it is.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for collecting waste paper generated in a dryer part of a paper machine in a paper mill.

[0002]

2. Description of the Related Art In a paper mill, in the case of starting a paper machine at the start of operation of a paper machine, switching varieties, or generating defective products during operation, the paper is milled until a paper of a desired quality flows stably. The paper is collected as broke without being wound at the exit of the paper machine. The recovered broke is recycled into pulp, which is a raw material for paper, and sent back to the paper machine.

[0003] Paper is finished from suspension pulp through three steps of a wire part, a press part, and a dryer part. At the start of operation, the paper from the wire part to the dry part is passed at a time with a predetermined product width. Since it is difficult to make paper due to the facility mechanism, usually, a narrow tail paper is first passed through to the next process, and when the paper is completely passed through to the next process, the width is changed to a predetermined product width. During this time, the wide portion other than the tail paper passed through to the next process, even if the desired quality is ensured, is dropped into the waste paper collection device directly below, collected as waste paper, and recycled into pulp. . Also, when a large amount of nonstandard products are generated due to troubles during operation, they are similarly collected as waste paper. Therefore, the paper machine is provided with facilities for collecting waste paper at various places.

[0004]

SUMMARY OF THE INVENTION As mentioned above,
In the prior art, broke is recovered at various points directly below the paper machine and is recycled to pulp on the spot or sent to a pulp to be recycled into pulp. However, since the waste paper generated in the dryer part has been considerably squeezed and dewatered in the previous process, it has a low water content and a large shape-retaining power, so that it becomes bulkier. Therefore, if the generation of waste paper continues for a long time, the stock place becomes full, which not only hinders the operation of the paper machine, but also requires a lot of labor to process the deposited paper waste.

[0005]

SUMMARY OF THE INVENTION The present invention is to solve the above problems by the following means. The present invention will be described with reference to the drawings. FIG. 1 and FIG.
It is an explanatory view of a waste paper collection device by the present invention. Figure 2
FIG. 4 is a partial cross-sectional view of the waste paper collecting device of FIG. 1 or FIG. 3. The apparatus of the present invention is provided immediately below the dryer part of the paper machine, drops the waste paper unwound from the damaged part of the dryer part of the paper machine into the pit of the paper machine installation foundation,
This is received by a take-up type canvas conveyor, and is to be transported to a waste paper receiving device such as a pulper.

In FIGS. 1 and 3, the waste paper receiving device is illustrated as a pulpper. However, when the pulpper is installed in another place, the waste paper receiving device conveys the waste paper to the pulpper. It becomes a transport device such as a conveyor or a temporary storage space therefor. In any case, since the waste paper is ultimately received by the pulper, the waste paper receiving device is hereinafter generically referred to as a pulper.

[0007] The machine base on which the dryer of the paper machine is installed usually has a width slightly larger than the papermaking width.
A pit is provided from the entrance to the exit of the paper machine, and waste paper is dropped into the pit. In the present invention, in the pit of the dryer part, a canvas conveyor M having a width slightly smaller than the pit width is installed on the pit floor surface, and runs on the floor surface. A chute plate S which is inclined downward from the pit top toward the pit bottom along the left and right pit walls of the paper machine is provided on the canvas conveyor so that the waste paper dropped from the upper part surely falls on the canvas conveyor M. M is installed so as to cover both ends in the width direction of M. The winding machines W1 and W2 alternately rotate in the winding direction or the rewinding direction. Therefore, the canvas conveyor M is alternately wound by the winding machines W1 and W2, and reciprocates in the pit.

[0008] A pulper is provided downstream of the canvas conveyor M. Broken paper generated in the paper machine is guided by the chute plate S and dropped by its own weight onto the canvas conveyor M below the paper machine. However, when the canvas conveyor M is running in the downstream direction, it is dropped. The waste sheet is transported by the canvas conveyor M in the direction of the waste sheet receiving device downstream and dropped into the pulper. Since the dried waste paper falls under its own weight without sticking to the canvas conveyor M, even the apparatus shown in FIG.
It is easily dropped into the pulper.

However, the waste paper generated near the entrance of the dryer part of the paper machine has a high water content, and thus may be stuck to the canvas conveyor M and not fall. In such a case, if the collecting device is a device as shown in FIG. 1, the waste paper stuck on the canvas conveyor M will be a doctor blade D
1 is scraped off from the canvas conveyor M and forcibly dropped into the pulper. Broken paper that does not fall into the pulper is taken up together with the canvas conveyor M, or falls and scatters around the take-up machine W1, which takes time to process. Therefore, the device shown in FIG. 1 is more preferable than the device shown in FIG.

[0010] When the canvas conveyor M is wound by the winder W1 by a predetermined amount, the winder W1 stops and reversely rotates in the rewinding direction or is separated from the rotary drive source and freely rotates. Then, the winding machine W2, which has been driven or rotated freely in the rewind direction, rotates in the winding direction, and starts winding the canvas conveyor M. At this time, the waste sheet on the canvas conveyor M is separated from the canvas conveyor M by the doctor blade D2, and stays on the canvas conveyor M downstream of the doctor blade D2. When the winding by the winding machine W2 is completed, the winding machine W2 stops and reversely rotates in the rewinding direction or is separated from the rotation drive source and freely rotates. Then, the winding machine W1 starts winding again, and the canvas conveyor M runs in the direction of the pulper, and sends the waste paper to the pulper.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the prior art, waste paper generated in a dryer part of a paper machine is dropped into a pit immediately below it, and is temporarily deposited there. When the pit becomes full, it is manually collected. Was transported to the pulper. Therefore, when a large amount of waste paper is generated, the processing takes a lot of labor. In the present invention, waste paper generated in the dryer part is dropped onto one canvas conveyor M covering the paper making width of the entire lower part of the dryer, and is transported to the waste paper receiving device such as a pulper by the canvas conveyor M. It is characterized by. The material of the conveyor M may be any material used for general belt conveyors, such as metal, rubber, plastic, etc.
In the present invention, as described later, it is most preferable to use a waste canvas conveyor generated in a paper machine.

[0012] A canvas conveyor is always used in a paper machine. A canvas used in a paper machine is made by weaving synthetic fibers into a coarse weave, and plays a role of circling along a heating roll surface and pressing paper against a heating roll in a dryer part of the paper machine. Moisture in the paper is heated by the heating roll, and evaporates and diffuses from the opposite surface via the canvas. Therefore, the canvas conveyor used for the paper machine has a moderate air permeability. And it is replaced regularly due to wear and deterioration.

The used canvas conveyor is usually discarded as it is. However, although these canvases are partially degraded and damaged, they can be used without any trouble to transport waste paper, satisfying favorable conditions such as elasticity, durability, air permeability, etc. Since it is slightly larger than the papermaking width, it can be sufficiently applied for carrying out waste paper. Therefore, in the practice of the present invention, it is the most economical to reuse the one that has been discarded by the dryer part of the paper machine as the canvas conveyor.

FIG. 1 shows an embodiment of the present invention, in which a canvas conveyor M is provided with a winder W1 at a dryer part outlet side.
Is supported from below by the rolls R1 and R2 and is inclined upward in the downstream direction. In the figure, K is a height limiting means, such as a bar or a roll, provided to limit the height of the waste sheet provided as needed. That is, since the waste paper is bulky when it is piled up, if it is carried out to the pulper in the same piled shape, the entrance may be blocked, or sometimes it may come into contact with the paper machine main body installed at the top. Height limiting means K such as a bar or a roll
The height of the mountain is leveled so as not to exceed a predetermined height. Therefore, one or more rolls R2 and one or more height limiters K are provided as necessary. G is a guide plate for preventing the canvas conveyor M from becoming loose, and is required when the distance between the rolls R1 and R2 is large. When the height limiting means K is a roll, it may be connected to a driving device for driving, or may be free to rotate without connecting to the driving device.

If the depth of the pit is made sufficiently deep, the height limiting means K is not necessary. However, in general, to make the pit deep only for carrying out the waste paper, the height limiting means must be provided. Pit construction costs are higher than installation costs and are not economical. The rolls R1 and R2 are provided for the same reason as described above. That is, before the dryer part exit, the canvas conveyor M is inclined upward in the downstream direction to increase the position where the waste paper is dropped, thereby increasing the installation position of the pulper, reducing the installation cost of the pulper, and simultaneously reducing the pulper installation cost. It is intended to facilitate maintenance management. If the position of the pulper is not raised, it is necessary to deepen the pit in which the pulper is installed, which not only increases the installation cost of the pulper, but also requires time and effort for maintenance and management. The roll R1 also has a role to secure a space for cleaning the canvas conveyor M by the doctor blade D1 or the air jet or water jet nozzle F in front of the winder W1, as described later.

E denotes a water shower or water jet nozzle, which showers or jets water toward the broke to absorb water into the broke, thereby reducing the bulk of the broke and increasing the weight. , And help the waste paper fall toward the pulper. Therefore, when the waste paper is not bulky, the waste paper is selectively installed in the same manner as the height limiting means K, and is not necessarily required for implementing the present invention. Further, when the air injection is more effective or the air injection is more effective than the water shower or the water injection, for example, when the paper to be made is a paper that hardly absorbs water, E may be the air injection nozzle.

The doctor blade D1 is for scraping off the damaged paper stuck to the canvas conveyor M, but is not always necessary when the damaged paper is less stuck. The air jet or water jet nozzle F is for jetting air or water from the back side of the canvas conveyor M to separate the waste paper stuck to the canvas conveyor M from the canvas conveyor. Although the doctor blade D1 is also installed for the same purpose, the doctor blade D1 alone cannot sufficiently scrape off the pulp fiber residue and the pigment added to the paper that have entered the texture of the canvas.

On the other hand, air jet or water jet chisels F
Is effective for cleaning the texture of the canvas conveyor M. If the pulp fiber lees, pigments, and the like that have entered the texture of the canvas conveyor M are left as they are, the pulp fiber lees and pigment dissipate in the pits, and the pits must be periodically cleaned. Therefore, the air jet or water jet nozzle F is not indispensable for the practice of the present invention, but it is desirable to install it. When the doctor blade D1 and the air jet or water jet nozzle F are not required, as shown in FIG. 3 described above, the winder W1 is installed at the position R1, and the canvas conveyor M is directly moved without the roll R1. It may be wound up.

H is a waste sheet shooter for dropping waste paper into a pulper, and is rotatable about a horizontal axis. At the time of waste paper processing, it is open as shown in FIG. Can be rotated in the direction of. In the case of FIG. 1, the waste sheet shooter H also serves as a support means for the doctor blade D1, and also has a role of sealing the dryer. The dryer is sealed with a hood so as not to escape the energy used for drying the paper, but the broke shooter H can also seal this part. Therefore, considering the cost of providing other sealing means for sealing this portion, the broke shooter H can be installed at a low facility cost, and thus it is desirable to provide the broke shooter H as much as possible.

The winding machines W1 and W2 may be continuously rotated alternately in the winding direction or the rewinding direction at regular time intervals during the operation of the paper machine. It may be driven. The traveling speed of the canvas conveyor M is not particularly limited, but is generally about 60
１２０120 m / min.

[0021]

According to the prior art, the waste paper generated in the dryer part of the paper machine is dropped into the pit immediately below, collected by human power, and transported to the pulper. Over the entire length,
A roll-up type canvas conveyor is provided, and waste paper generated in various parts of the dryer part is carried out to the pulp machine. Recently installed paper machines are becoming larger and larger, for example, those having a width of 10 m and a length from the wire part to the dryer part of 110 m.
If an attempt is made to provide a waste paper unloading device over the entire width and the entire length of such a large paper machine in a usual manner, a large amount of cost is required.

For example, if a rubber belt widely used for conveyance is used, the weight of the belt itself is heavy and the weight of waste paper is further added. A belt supporting means such as a supporting roll is required. In the present invention, a lightweight canvas conveyor M is laid directly on the floor inside the pit over the entire width and the entire length in the pit of the installation base of the paper machine, and is run, thereby making the waste paper unloading device inexpensive. In addition, as a conveyor, used in the dryer part of the paper machine,
By using a canvas conveyor that is periodically replaced and disposed of, the maintenance cost of the waste paper unloading device can be reduced.

[Brief description of the drawings]

FIG. 1 is an explanatory view of an apparatus of the present invention.

FIG. 2 is a partial cross-sectional view of the device of the present invention.

FIG. 3 is an explanatory view of the device of the present invention.

[Explanation of symbols]

 B Pit floor of paper machine base D1 Winding machine D2 Winding machine E Nozzle F Nozzle G Guide plate H Broke shooter K Height limiting means M Canvas conveyor P Paper machine base plate R1 Roll R2 Roll S Chute plate W1 Winding machine W2 winder

Claims (7)

[Claims] An apparatus for dropping waste paper generated in a dryer part of a paper machine onto a conveyor and collecting the waste paper in a waste paper receiving device by a conveyor, comprising: 1. A pit wider than the paper making width is provided on the machine base of the dryer part of the paper machine. 2. Install a canvas conveyor (M) with a width slightly smaller than the pit width inside the pit; 3. A chute plate (S) inclined downward from the pit top toward the pit bottom is installed along the pit wall so as to cover both ends in the width direction of the canvas conveyor (M). The lengthwise ends of the canvas conveyor (M) are
4. connected to the winders (W1) and (W2) installed on the dryer part exit side and the dryer part entrance side, respectively; In front of the winder (W2) on the entrance side of the dryer part, a doctor blade (D2) that abuts on the canvas conveyor (M) in a reverse direction to the direction in which the canvas conveyor (M) is wound by the winder (W2). ), And 6). By operating the winders (W1) and (W2) alternately, the canvas conveyor (M) is reciprocated between the dryer part entrance and the dryer part exit to carry out the waste paper to the waste paper receiving device. A waste paper collecting device characterized by the above-mentioned. 2. A winder (W) at the dryer part outlet side.
Rolls (R1) and (R2) that support the canvas conveyor (M) from below under the canvas conveyor (M) and tilt the canvas conveyor (M) in the ascending direction just before 1), and furthermore, an upstream roll (R2)
2. A waste paper collecting apparatus according to claim 1, further comprising a height restricting means (K) for restricting the height of the waste paper above the paper. 3. A nozzle (F) for jetting air or water from a back surface of a canvas conveyor (M) running between a roll (R1) and a winder (W1). A waste paper collecting device according to item 1. 4. A surface of a canvas conveyor (M) running between a roll (R1) and a winder (W1),
The doctor blade (D1) according to claim 2 or 3, further comprising a doctor blade (D1) that abuts on the canvas conveyor (M) in a non-return direction with respect to a direction wound by the winder (W1). Broken paper collection device. 5. A waste paper shooter (H) that rotates and opens and closes about a horizontal axis at a waste paper waste receiving opening of the waste paper waste receiving device. Paper collection device. 6. The waste paper collecting apparatus according to claim 5, wherein a doctor blade (D1) is attached to a leading end of the waste paper shooter (H). 7. A nozzle for spraying air or water or a nozzle for showering water is provided above the roll (R1) to assist in dropping waste paper.
7. The waste paper collection device according to 6.