Debaler system of a finishing apparatus of a fibrous web production line

Abstract

The present case relates to a broke system of a finishing device of a fibrous web line, the finishing device being configured to process a fibrous web, the finishing device comprising two trimming devices at edge regions of the fibrous web, each trimming device being configured to cut an edge strip from a respective edge of the fibrous web, the finishing device further comprising at least one roll and the broke system. The broke system consists of two broke, each broke being arranged in connection with the finishing device at a region below the trimming devices such that each broke is configured to receive the edge strips separately, each broke having a width in a transverse direction relative to a main running direction of the fibrous web which is less than half of a width of the finishing device in the transverse direction relative to the main running direction of the fibrous web, the width of the broke being measured at a widest / longest distance between inner surfaces of the broke, the width of the finishing device being measured as a length of a longest roll of the finishing device on its main cylindrical surface, excluding shaft ends, bearings or corresponding elements.

Description

Technical Field

[0001] In general, this utility model relates to the production of fiber webs in a fiber web production line. More specifically, this utility model relates to a pulping system of a finishing device in a fiber web production line. Background Technology

[0002] Fiber webs (such as paper or paperboard webs) are produced in a fiber web production system (typically in a fiber web production line) by fiber web production methods. As known in the art, fiber web production methods and systems typically include an assembly formed by multiple devices arranged sequentially on a fiber web production line. A typical fiber web production and processing line includes a headbox, wire section, and press section, as well as subsequent drying section and winding machine. The production and processing line may also include other devices and / or sections for finishing the fiber web, such as a pre-calender, sizing machine, final calender, coating section, and at least one slitter-winder for forming customer rolls, as well as roll packaging equipment.

[0003] As is well known, fiber web production lines can be hundreds of meters long. Modern fiber web production lines can produce more than 450,000 tons of fiber webs per year. The speed of fiber web production lines can exceed 2,000 meters per minute, and the width of the fiber webs on the production line can exceed 11 meters.

[0004] On the fiber web production line, fiber web production is a continuous process. The fiber webs produced on the fiber web production line are wound into master rolls by a paper reel around a winding shaft (i.e., a reel). These master rolls can have a diameter exceeding 5 meters and a weight exceeding 160 tons. The purpose of winding is to transform the flattened fiber webs into a more easily processed form. At the paper reel located on the fiber web production line, the continuous process is first interrupted, and the operation transitions to a periodic operation.

[0005] The master rolls of fiber web produced on the fiber web production line are full-width, often exceeding 100 kilometers in length. Therefore, before being delivered from the fiber web factory, they are slit into portions of fiber web (partial fiber web) with suitable widths and lengths for the fiber web factory's customers and wound around the core into so-called customer rolls (partial fiber web rolls). It is known that the slitting and winding of the fiber web is carried out in a suitable separate machine (i.e., a slitting and rewinding machine).

[0006] On a slitting and rewinding machine, the master roll is unwound in the unwinding section, and the wide web is slit into narrower sections in the slitting section. These sections are then wound around a core (such as a spool) in the winding section to form a customer roll. Once the customer roll is complete, the slitting and rewinding machine stops, and the wound roll (i.e., a set of rolls) is removed from the machine. A new core for the new section of fiber web for the next set of rolls is transported to the winding station to wind the new section of fiber web for the next set of rolls. The process then continues on the slitting and rewinding machine to wind the new set of rolls. These steps are repeated periodically until the fiber web of the master roll is used up, at which point the master roll is replaced, and the operation restarts with the unwinding of the next new master roll.

[0007] As is known from existing technology, in order to obtain clean / high-quality fiber web edges, the width of the full-width fiber web is trimmed before winding by cutting edge strips along the longitudinal direction (i.e., by water jet cutting to remove trim strips from the wide fiber web) to provide the required trimmed width for the fiber web to be wound onto the master roll. Edge trimming devices are typically based on water jet cutting or rotary blade cutting. After cutting, the trim strips are usually guided to repulping via a pipe-like removal device, which typically generates negative pressure using a jet, shredder blower, or negative pressure fan. Alternatively, suction, air blowing, water jetting, etc., are used to guide the trim strips to repulping, directly to the pulper, or via a waste conveyor to a waste treatment unit or pulper.

[0008] As is known from the prior art, a sliver slitting and removal device associated with a finishing apparatus (typically a slitting and rewinding machine or a calender) is provided for slitting sliver strips from a fiber web. For example, in a multi-station rewinding type slitting and rewinding machine, the sliver strip is slitted at two points / stages when necessary: ​​first, in a so-called pre-slitting section, the sliver strip is slitted immediately after unwinding and before slitting a portion of the web; second, the sliver strip is actually slitted in a slitting section associated with the slitting of the portion of the web. If pre-slitting is not required, the irregular edges of the fiber web are removed in the actual slitting section of the portion of the web. The sliver strips produced in the slitting of the sliver strips are typically conveyed to a pulper via an sliver strip conveying system, which is a designated sliver strip pulper. Patent application publication number WO2008062096A1 discloses a slitting and rewinding machine, which includes an unwinding station, a slitting section, and a winding section. A pulper is provided below the unwinding station. An edge trimming device is provided on the web running path between the unwinding station and the slitting section of the slitting and rewinding machine. The edge trimming device is located close to the unwinding station so that the trimmed edge trim can be guided to the pulper of the unwinding station.

[0009] Pulperies known in the prior art for receiving edge slivers extend substantially below the full width of the finishing unit, and thus are essentially the same width as the fiber web, i.e., extending laterally relative to the main running direction of the fiber web. The pulper is located below the finishing unit, typically in a basement area below the plant floor. The pulper has a vat in which the waste paper (i.e., edge slivers) is re-pulped. The volume of the vat is related to its width and length, resulting in a situation where, due to the full width of the pulper, the vat volume is larger than the volume required for edge sliver production. Therefore, energy consumption is higher, and additional power is required for proper slushing. Consequently, the pulper is larger than the required edge sliver production. Furthermore, a larger electric motor is needed for proper mixing. And, in some cases, a pit needs to be dug in the basement to provide sufficient space for the pulper. Utility Model Content

[0010] The purpose of this invention is to design a pulping system for a finishing device in a fiber web production line, wherein the disadvantages and problems of the prior art are eliminated or at least minimized.

[0011] The purpose of this invention is also to design a pulper system for a finishing device of a fiber web production line, wherein the disadvantages and problems of the prior art, particularly those related to the space requirements and energy consumption of the pulper, are eliminated or at least minimized.

[0012] To achieve the above objectives, the main features of the pulping system of the finishing device for the fiber web production line according to this utility model are described below.

[0013] The advantages, implementation methods and features are described below.

[0014] According to an advantageous aspect of this invention, the pulping system of the finishing device in a fiber web production line comprises two pulpers, each pulper being connected to the finishing device and positioned in an area below an edge trimming device for separately cutting the longitudinal sides of the fiber web, such that each pulper receives edge strips cut by the edge trimming device. The width of each pulper in the transverse direction relative to the main running direction of the fiber web is less than half the width of the finishing device, advantageously less than one-third the width of the finishing device. The width of the pulper is measured at the widest / longest distance between the inner surfaces of the pulper in the transverse direction relative to the main running direction of the fiber web, while the width of the finishing device is measured as the length of the longest roller of the finishing device on its main cylindrical surface, excluding shaft ends, bearings, or corresponding components.

[0015] According to an advantageous aspect of the present invention, the pulping system of the finishing device of the fiber web production line includes two pulpers, each pulper having a width less than half the width of the finishing device, advantageously less than one-third the width of the finishing device, and each pulper including: an edge material channel for receiving and guiding edge edge material strips from a corresponding trimming device of the finishing device; a chute structure connected to the edge material channel, the chute structure advantageously including means to facilitate the advance of the edge edge material strips; and a trough connected to the chute structure and configured to re-pulpify the edge edge material strips.

[0016] This invention and its advantageous features offer numerous benefits: Because the total width of the pulper is smaller than its full width, it significantly saves space. The reduced width also decreases the need for vertical space, allowing the pulper to be placed on the basement floor without the need for digging a pit. Furthermore, the smaller size of the pulper requires less power, resulting in significant energy savings.

[0017] The exemplary embodiments of the present invention given in this patent application should not be construed as limiting the scope of protection of the appended claims. In this patent application, the verb "comprising" and its derivatives are used as an open-ended limitation, not excluding the presence of features not listed. Unless otherwise expressly stated, the features described below can be freely combined with each other. Attached Figure Description

[0018] The present invention will be described in detail below with reference to the accompanying drawings, but the present invention is not narrowly limited to the drawings, wherein:

[0019] Figure 1 An advantageous example of a pulper system for the finishing unit of a fiber web production line is illustrated schematically. Detailed Implementation

[0020] In the following description, the same numbers and symbols will be used to identify the same elements according to the views used to illustrate the present invention and its advantageous examples. For clarity, some repeated reference numerals have been omitted from the figures.

[0021] exist Figure 1The example shown illustrates a pulper system 15 of a finishing device 10 for a fiber web production line. The finishing device 10 is, for example, a slitting and rewinding machine 10 of a fiber production line. The finishing device 10 includes at least one roller 20 along which the fiber web W to be finished runs. The finishing device 10 also includes trimming devices 21A and 21B for slitting (i.e., cutting longitudinally, that is, along the main running direction of the fiber web W) the edges of the fiber web W, thereby separating edge strips E1 and E2 from the fiber web W. Trimming devices 21A and 21B can be known trimming devices, such as waterjet cutting devices or blade cutting devices. In the example of this figure, the main running direction of the fiber web W is the depth direction of the drawing, and the transverse direction CD refers to the direction perpendicular to the main running direction of the fiber web W, as shown. After slitting, the edge strips E1 and E2 are guided to edge channels 12A and 12B, respectively. The edge channels 12A and 12B further guide the edge strips E1 and E2 to chute structures 13A and 13B, which are advantageously equipped with respective grooves 14A and 14B for guiding the edge strips E1 and E2 to pulpers 15A and 15B. Therefore, the pulper system 15 consists of two pulpers 15A and 15B, each connected to the finishing device 10 and positioned below the trimming devices 21A and 21B for slitting the longitudinal sides of the fiber web, such that each pulper 15A and 15B receives the edge strips E1 and E2 cut by the trimming devices 21A and 21B. In the pulper system 15, each pulper 15A, 15B includes: edge material channels 12A, 12B for receiving and guiding edge edge material strips E1, E2 from corresponding trimming devices 21A, 21B of the finishing device 10; and chute structures 13A, 13B connected to the edge material channels 12A, 12B, the chute structures advantageously including equipment to facilitate the advance of the edge edge material strips E1, E2, such as air blowing devices, water spraying and / or suction devices. Each pulper 15A, 15B also includes troughs 14A, 14B connected to the chute structures 13A, 13B and configured to re-pulpify the edge edge material strips E1, E2. The finishing device 10 is located on the floor 25 of the plant 45, and the chute structures 13A, 13B are arranged to pass through openings in the floor 25 to reach a basement space 40 of the plant 45 located below the floor 25. The pulpers 15A and 15B of the pulper system 15 are supported on the floor 30 of the basement space 40, such that the troughs 14A and 14B are supported on the floor 30 of the basement space 40, and the chute structures 13A and 13B extend upward from the troughs 14A and 14B through the floor 25 of the plant 45 to the edge material channels 12A and 12B, which in turn extend upward to receive edge material strips E1 and E2 from the edge trimming devices 21A and 21B.

[0022] The widths W15A and W15B of each pulper 15A and 15B in the transverse direction (CD) relative to the main running direction of the fiber web W are less than half, and advantageously less than one-third, of the width L20 of the finishing device 10 in the transverse direction (CD) relative to the main running direction of the fiber web W. The widths W15A and W15B of the pulpers 15A and 15B are measured at the widest / longest distance W15A and W15B between the inner surfaces of the pulpers 15A and 15B in the transverse direction (CD) relative to the main running direction of the fiber web W, while the width L20 of the finishing device 10 is measured as the length L20 of the longest roller 20 of the finishing device 10 on its main cylindrical surface, excluding shaft ends, bearings, or corresponding components. Therefore, the total width of the pulpers 15A and 15B is less than the width of the finishing device 10, advantageously less than two-thirds of the width of the finishing device 10.

[0023] In the above description, although some features and examples have been described with reference to certain characteristics and examples, these features may also be implemented by other features and examples, whether described or not. Similarly, although some features have been described with reference to certain examples, these features may also exist in other examples, whether described or not.

[0024] The above describes only some advantageous examples of the present invention. The present invention is not narrowly limited to these examples, and many modifications and variations can be made within the scope of the present invention.

Claims

1. A pulper system for a finishing device in a fiber web production line, the finishing device (10) being configured to process fiber webs (W), the finishing device (10) comprising two trimming devices (21A, 21B) located at the edge region of the fiber web (W), each of the trimming devices (21A, 21B) being configured to cut edge strips (E1, E2) from the corresponding edge of the fiber web (W), the finishing device (10) further comprising at least one roller (20) and the pulper system (15), characterized in that, The pulping system (15) consists of two pulpers (15A, 15B), each pulper being connected to the finishing device (10) and positioned in the area below the trimming device (21A, 21B), such that each pulper (15A, 15B) is configured to receive the edge strips (E1, E2) respectively, and the width (W15A, W15B) of each pulper (15A, 15B) in the transverse (CD) direction relative to the main running direction of the fiber web (W) is smaller than that of the finishing device (10) relative to the edge strips (E1, E2). The width (L20) of the fiber web (W) in the transverse (CD) direction of the main running direction is half of the width (L20), and the width (W15A, W15B) of the pulper (15A, 15B) is measured at the widest / longest distance (W15A, W15B) between the inner surfaces of the pulper (15A, 15B), and the width (L20) of the finishing device (10) is measured as the length (L20) of the longest roller (20) of the finishing device (10) on its main cylindrical surface, excluding shaft ends, bearings or corresponding components.

2. The pulper system according to claim 1, characterized in that, The width (W15A, W15B) of the pulper (15A, 15B) in the transverse (CD) direction relative to the main running direction of the fiber web (W) is less than one-third of the width (L20) of the finishing device (10) in the transverse (CD) direction relative to the main running direction of the fiber web (W).

3. The pulper system according to claim 1, characterized in that, Each pulper (15A, 15B) includes: a sapwood channel (12A, 12B) for receiving and guiding the edge sapwood strips (E1, E2) from the corresponding trimming devices (21A, 21B); a chute structure (13A, 13B) connected to the sapwood channel (12A, 12B); and each pulper (15A, 15B) further includes a trough (14A, 14B) connected to the chute structure (13A, 13B) and configured to re-pulpify the edge sapwood strips (E1, E2).

4. The pulper system according to claim 3, characterized in that, The finishing device (10) is located on the floor (25) of the factory building (45), the chute structure (13A, 13B) is arranged to pass through the opening in the floor (25) to reach the basement space (40) located below the floor (25) of the factory building (45), and the pulpers (15A, 15B) of the pulper system (15) are supported on the floor (30) of the basement space (40).

5. The pulper system according to claim 4, characterized in that, The troughs (14A, 14B) of the pulpers (15A, 15B) are supported on the floor (30) of the basement space (40).

6. The pulper system according to claim 4, characterized in that, The chute structures (13A, 13B) extend upward from the grooves (14A, 14B) through the floor (25) of the plant (45) to the edge material channels (12A, 12B), which extend upward to receive the edge material strips (E1, E2) from the trimming devices (21A, 21B).

7. The pulper system according to any one of claims 3 to 6, characterized in that, The chute structures (13A, 13B) include equipment to facilitate the advancement of the edge strips (E1, E2).

8. The pulper system according to any one of claims 3 to 6, characterized in that, The trimming devices (21A, 21B) are waterjet cutting devices or blade cutting devices.

9. The pulper system according to any one of claims 3 to 6, characterized in that, The finishing device (10) is a slitting and rewinding machine or a calender.

10. The pulper system according to any one of claims 3 to 6, characterized in that, The chute structure (13A, 13B) includes an air blowing device, a water spray and / or a suction device.

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