JP2020501942A - Paper log manufacturing plant - Google Patents

Abstract

A plurality of operating units (A) configured to produce a log of paper material starting from a web (W) of paper material unwound from one or more corresponding reels (1) and controlled by a control unit (2). , B, C), wherein the control unit (2) manufactures a paper log in which each operating unit (A, B, C) is configured to operate at a predetermined production speed in turn. For plants. The control unit (2) according to the data contained in the database (5D) individually associated with each reel (1) and the predicted classifications (I, II, III, IV) based on the influence of defects in the production of logs. The programmed representative defects (10-21) and the representative locations of the defects on the web unwound from the reel are programmed. Said control unit (2) receives position data on the instantaneous diameter of the reel by means of the corresponding detection means (3; 4). The control unit (2) is programmed to modify the production speed as a function of the instantaneous location and type (I, II, III, IV) of each of the defects (10-21). [Selection diagram] Fig. 1

Description

  The present invention relates to a plant for producing paper logs.

  During the production of paper webs, between the Yankee dryer and the rewind of the paper machine, optical devices are usually used to detect the presence of defects, locate the defects and record their shape in the corresponding photographic image Provided. A data file associated with the particular reel where the defect location is stored is also created. The data in the file corresponds to the intended position of the defect as the number of defects per unit area, and in some cases also to the density.

  If the reels are used in a paper conversion plant, for example to produce logs where toilet paper rolls or kitchen paper rolls are produced, the operator is associated with the reel in use and recorded in the respective file. Depending on the defect data, adjust the speed of the processing machines or stop them.

  Knowing that there is a defect that could jeopardize the production of logs at a given diameter of the reel in use, the operator can slow down the machine or stop production when this diameter is reached Let it. However, this procedure is inefficient because it relies heavily on operator experience and attention.

  The main object of the present invention is to overcome the aforementioned disadvantages.

  This effect has been achieved according to the present invention by employing the idea of implementing a plant having the features set forth in claim 1. Another feature of the invention is the subject of the dependent claims.

  With the present invention, the degree of automation of log production can be increased to a significant extent, making the level of operator experience independent of the efficiency of the process. In this way, the quality of the final product can be improved by reducing waste, since the paper used is subject to regulated stresses based on previously detected defects. Work safety has also increased due to the significant increase in production automation that reduces operator intervention.

  These and further advantages and features of the present invention will be better understood by those skilled in the art from the following description and accompanying drawings, which are provided by way of example and not by way of limitation. Not to be considered.

FIG. 2 is a schematic simplified view of a paper log manufacturing plant from above. 2 schematically shows a series of possible defects of the web used in the plant of FIG.

  According to the present invention, it is considered that a data file specifying the position and type of a defect detected in the manufacturing step of the same parent reel (1) is associated with each parent reel (1). The type of defect is determined on the basis of a predetermined criterion that takes into account the possible adverse effects of the defect during use of the reel (1) in a paper processing plant.

  The data file is input to a program-controllable unit (2), which processes the data file and, based on the type and location of each defect, one or more operating units (A) of the plant. , B, C). In practice, depending on the type and position of each defect, the control unit (2) controls the operating units (A, B, C) such that the operating units (A, B, C) are decelerated or possibly stopped. Activate

  For example, referring to FIG. 1, the operation units are an unwinding machine (A), an embossing machine (B), and a rewinding machine (C) which are sequentially arranged along the paper feeding direction (FW).

  The unwinding machine (A) is a machine configured to support at least one reel (1) and enable it to be unwound.

  The embossing machine (B) is a machine arranged downstream of the unwinding machine (A), where the paper is embossed.

  The rewinding machine (C) is a machine in which the paper web exiting from the embossing machine (B) is rewound, and is a machine that produces rolls or logs smaller in diameter than the parent reel (1).

  Otherwise, the operating unit may simply be an unwinding machine (A) and a rewinding machine (C) arranged one after another along the direction (FW).

  In both cases, the unit is known per se and does not require any mechanical or structural changes for the actual implementation of the invention. It will be appreciated that the number of operating units that make up the paper processing plant is not a limiting factor of the invention disclosed herein.

  As mentioned earlier, the type of defect presented by the parent reel (1) is defined according to the possible adverse effects of using the paper in a paper processing plant. For example, the number of defect types (I, II, III, IV) is four, and the adverse effects of using the paper in the paper processing plant become increasingly less important.

  For example, a possible classification of a defect in relation to the position of the defect can be defined by the following table

In the example table above, it is as if the plant was shut down due to a Type I defect. For example, a defect of type I corresponds to a discontinuity (10) of the paper web (W) of any shape supplied by the reel (1) and of an area larger than 70 cm ² , or Corresponds to a discontinuity (11) oriented substantially along the transverse direction (T) and having a length (h11) equal to at least 20% of the width (LW) of the web (W), or It corresponds to a series of discontinuities (12) having individually reduced widths but included in the area (A12), whereby the sum of the areas of the individual discontinuities associated with the area (A12) is 0.2 ( ΣAi / A12 ≧ 0.2, where Ai is a single discontinuous area, and A12 is a reference area).

Similarly, for example, a type II defect may be present in the discontinuity (13) of the paper web (1) in any shape supplied by the reel (1) and in the area comprised between 70 cm ² and 50 cm ^2. A corresponding or oriented length (h14) of the web (W14) oriented along a substantially orthogonal direction (T) and comprised between 20% and 10% of the width (LW) of the web (W). Corresponding to a series of discontinuities (15) included in a region (A15) having an individually reduced extension or corresponding to the region (A15). The sum of the areas of the individual discontinuities is between 0.2 and 0.1 (0.2> ΣAi / A15 ≧ 0.1, where Ai is the area of a single discontinuity and A15 is This is a reference area).

Similarly, for example, a type III defect may be present in the discontinuity (16) of the paper web (1) in any shape supplied by the reel (1) and in the area comprised between 50 cm ² and 30 cm ^2. The length (h17) corresponding or oriented along the direction substantially transverse to the web (T) and comprised between 10% and 5% of the width (LW) of the web (W) Corresponding to a series of discontinuities (18) having an individually reduced extension but included in the area (A18), thereby relating to the area (A18) The sum of the individual discontinuous regions is between 0.1 and 0.05 (0.1> ΣAi / A18 ≧ 0.05, where Ai is a single discontinuous region and A18 Is a reference area).

Finally, for example, a defect of the type IV is a discontinuity (19) of the paper web (1) in any shape supplied by the reel (1) and in the area comprised between 30 cm ² and 10 cm ^2. Corresponding or discontinuous with the web oriented along a substantially orthogonal direction (T) and having a length comprised between 5% and 2% of the width (LW) of the web (W) Corresponding to section (20) or to a series of discontinuities (21) with individually reduced extensions, whereby the sum of the areas of the individual discontinuities associated with area (A21) is It is between 0.05 and 0.03 (0.05> ΣAi / A21 ≧ 0.03, where Ai is a single discontinuous area and A21 is a reference area).

  In practice, for defects (12, 15, 18, 21), the classification criteria are based on their surface density. It is understood that web (W) defects can be classified according to any other criteria.

  Similarly, the programmed operation can be different depending on the desired quality of the finished product and the type of paper. In other words, the values presented above by way of example and the corresponding programmed actions may vary depending on the structural properties of the paper and / or on the desired effect on the quality of the finished product.

  In practice, the plants according to the invention cooperate with each other to produce logs of paper material at a predetermined production operating speed using at least one paper web (W) supplied by the parent reel (1). Includes several operating units (A, B, C), where said units (A, B, C) stop themselves or are presented by web (W) and used by control unit (2) Controlled by a control unit (2) programmed to reduce the speed of their operation according to the location and type of defects (10-21) recorded in the database to be processed, and thereby each defect (10-21) Controlling the operating speed of said units (A, B, C) according to a predetermined control criterion relating to the corresponding operating mode of the controlled unit; .

  The database of defects presented by the web (W) is obtained in the production stage of the parent reel (1) and used in the subsequent use stage.

  The control unit (2) synchronizes the units (A, B, C) constituting the log production line with each other on the basis of the position and type of the defect of the web (W) acquired during the production of the web (W). Drive.

  In practice, web (W) defects are detected, located and recorded during web production by means of optical inspection systems commonly used to control the quality of the product in the paper machine.

  The classification of the defects detected and localized in this way is, according to the invention, according to the invention, as described above, according to the criteria that adversely affect the various types of defects in the production phase of the increasingly smaller real logs. Stipulated.

  For example, referring to the illustrative table above, a Type I defect can define a tear or breakage of the web during the manufacture of the log, even in the event of a slowdown of the units (B, C) that use it.

  Or, for example, a defect of type II or class III does not reduce the production speed of the unit (B, C) by 50% or 30%, but in each case the quality of the log is reduced due to the defects present. If they hinder their commercialization, they can cause the web to tear or break.

  Alternatively, if, for example, the production speed of the units (B, C) does not decrease by 30%, but the quality of the produced logs is still sufficient to enable its commercialization, a defect of type IV can cause web defects. May cause tearing.

  For example, the normal production speed, ie, the production speed without classified defects, is 650 meters per minute of web.

  The location of each defect on the web (W) has a direct correlation with the instantaneous diameter of the reel (1). The instantaneous diameter of the reel (1) can be determined, for example, based on the unwind speed of the web, by an encoder (3) connected on the axis of the same reel, or by a photocell (4) arranged in front of the reel end. ) Or equivalent optics.

  The output of the encoder (3) or the photocell (4) is connected to the input of the control unit (2). For the sake of simplicity, the connection between the photocell (4) and the control unit (2) is not shown in FIG.

  The defect database is stored in, for example, a server (5) connected to the control device (2). The server (5) has a memory for storing a defect database of each reel arranged on the unwinder (A). Alternatively, the same control unit (2) has a memory for storing a defect database of each reel arranged on the unwinder (A).

  Thus, the control unit (2) continuously receives data on the instantaneous diameter of the reel (1), ie on the "length" of the unwound web, and may correspond to the instantaneous diameter of the reel itself. In response to the defect, the operation programmed in the unit (A, B, C) is started.

  In FIG. 1, the "2P" block indicates a software program residing in the control unit (2), which processes the input data relating to the instantaneous diameter of the reel (1) and the data contained in the defect database and performs corresponding operations A command is issued to the control unit (2) to perform the operation described above based on the execution algorithm. The control unit (2) is connected to the drivers (AA, AB, AC) of the units (A, B, C) controlled by it.

  The “5D” block indicates a defect database stored in the server (5).

  If the paper material wound up on the rewind (C) consists of several plies supplied by more than one parent reel, the control unit (2) uses the defect database of each web and programs it. Intervene to initiate the programmed action independent of the particular ply presenting the type of defect corresponding to the action performed.

  In other words, even if only one ply has a given type of defect, the control unit (2) commands the activation of the corresponding programmed operation, even if the other ply does not show a defect. I do.

  In other words, the web (W) used to manufacture the logs can be formed from multiple plies, each ply being executed by a corresponding reel, and each reel being associated with a corresponding database of defects according to the above. .

  In this case, the control unit (2) activates the above-mentioned programmed operation based on the individual database. For example, the plies can be joined together in an embossing machine (B) according to methods known to those skilled in the art.

  Thus, more generally speaking, a plant for producing logs of paper material is configured to produce logs of paper material starting from a paper web (W) supplied by one or more corresponding reels (1). , A plurality of operating units (A, B, C) controlled by a control unit (2), such that each operating unit operates in turn with a predetermined production speed. The control unit (2) further comprises a predictive classification (I, II, II) based on the data contained in the database (5D) individually associated with each reel (1) and the effect of the defects themselves in the production of logs. III, IV) to process the representative defects (10-21) and the representative positions of the defects on the web unwound from the reel. The control unit (2) further receives position data correlating to the instantaneous diameter of the reel by means of the corresponding detection means (3; 4), and the control unit (2) receives the respective defects. It is programmed to modify the production rate as a function of (10-21) instantaneous position and type (I, II, III, IV).

  Therefore, according to the present invention, the system (A, B, C) is used according to an automatic procedure for managing programmed operation using data relating to defects of the web (W) unwound from the reel (1). Can be driven synchronously, reducing possible adverse effects of defects in the production of paper logs.

  Until the predetermined production speed reaches a second speed that is lower than the production speed (i.e., reaches a speed value corresponding to programmed operation and corresponding to unwinding of the web defect from reel (1)). It is also possible to program the control unit (2) to be changed according to a predetermined deceleration ramp and then to reach a starting production value according to a predetermined acceleration ramp.

  In other words, the programmed actions are appropriate for passing through defective portions of the paper web, taking into account inertia and delays in the execution of actions connected to the actuators used to drive the units that make up the plant. Is predictable.

  For example, the defect database may provide a barcode applied to the reels in such a way as to create a unique association between the barcode and the defects forming the database of reel defects categorized as described above. Can be associated with a specific reel. The barcode can be read by a barcode reader used by the operator when loading the reel into the unwinder.

  Alternatively, the defect database may have an unambiguous association between the location of the reels in the warehouse and the defects forming a database of reel defects classified as described above, or a link between the database and the trolley in use. It can be associated with a location occupied by a reel in an automated warehouse (eg, an automated warehouse with one or more conveyor elevators possibly served by an LGV trolley) to form a clear association.

  In any case, it will be appreciated that the method of associating the single reel defect database may vary according to the particular characteristics of the plant.

  In practice, equivalent details may be made with respect to the individual elements described and illustrated without departing from the spirit of the solution adopted, and thus without departing from the scope of protection afforded by this patent. Can be changed with.

  1: reel, 2: control unit, 2P: software program, 3: detecting means, encoder, 4: detecting means, photocell, 5: server, 5D: database, 10 to 21: defect, discontinuity, A: operation Unit, unwinder, A12, A15, A18, A21: area, AA, AB, AC: driver, B: operation unit, embossing machine, C: operation unit, rewinding machine, FW: paper feed direction, h11, h14 , H17: length, LW: width of web, T: direction, W: web.

Claims (6)

A plurality of operating units (A) configured to produce a log of paper material starting from a web (W) of paper material unwound from one or more corresponding reels (1) and controlled by a control unit (2). , B, C), comprising:
The control unit (2) is configured such that each operation unit (A, B, C) operates in sequence with a predetermined production speed,
The control unit (2) performs a predictive classification (I, II, III, IV) based on the data contained in the database (5D) individually associated with each reel (1) and the effect of defects on the production of logs; Programmed to process representative defects (10-21) classified according to and representative positions of the defects on the web unwound from the reel;
Said control unit (2) receives position data relating to the instantaneous diameter of the reel by means of corresponding detection means (3; 4);
The control unit (2) is programmed to modify the production rate as a function of the instantaneous position and type (I, II, III, IV) of each of the defects (10-21);
The modification of the production speed is temporally predicted with respect to the passage of a part of the web (W) exhibiting defects (10-21), the predetermined production speed reaching a second speed lower than the production speed A paper log manufacturing plant, wherein correction is performed according to a predetermined deceleration ramp until then, and then correction is performed by a predetermined acceleration ramp until the production speed at the start is restored.   The plant according to claim 1, wherein the operation units are an unwinder (A), an embossing machine (B), and a rewinding machine (C).   Wherein said control unit (2) is programmed to reduce said production rate as a function of the instantaneous location and type (I, II, III, IV) of each of said defects (10-21). The plant according to claim 1, characterized in that:   The control unit (2) is programmed to make the production rate equal to zero as a function of the instantaneous location and type (I, II, III, IV) of each of the defects (10-21). The plant according to claim 1, wherein:   The control unit (2) instructs the control unit (2) to execute the processing by using data included in the database (5D) and to change the production speed as necessary. Plant according to claim 1, characterized in that the software program (2P) is resident.   The plant according to claim 1, wherein the database (5D) is recorded on a server (5) having a data output connected to a data input of the control unit (2).

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