Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
  • B65H43/00—Use of control, checking, or safety devices, e.g. automatic devices comprising an element for sensing a variable
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
  • B65H18/00—Winding webs
  • B65H18/08—Web-winding mechanisms
  • B65H18/26—Mechanisms for controlling contact pressure on winding-web package, e.g. for regulating the quantity of air between web layers
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
  • B65H2511/00—Dimensions; Position; Numbers; Identification; Occurrences
  • B65H2511/10—Size; Dimensions
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
  • B65H2515/00—Physical entities not provided for in groups B65H2511/00 or B65H2513/00
  • B65H2515/12—Density
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
  • B65H2515/00—Physical entities not provided for in groups B65H2511/00 or B65H2513/00
  • B65H2515/30—Forces; Stresses
  • B65H2515/31—Tensile forces
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
  • B65H2515/00—Physical entities not provided for in groups B65H2511/00 or B65H2513/00
  • B65H2515/30—Forces; Stresses
  • B65H2515/31—Tensile forces
  • B65H2515/314—Tension profile, i.e. distribution of tension, e.g. across the material feeding direction or along diameter of web roll
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
  • B65H2515/00—Physical entities not provided for in groups B65H2511/00 or B65H2513/00
  • B65H2515/81—Rigidity; Stiffness; Elasticity
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
  • B65H2515/00—Physical entities not provided for in groups B65H2511/00 or B65H2513/00
  • B65H2515/84—Quality; Condition, e.g. degree of wear
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
  • B65H2553/00—Sensing or detecting means
  • B65H2553/30—Sensing or detecting means using acoustic or ultrasonic elements
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
  • B65H2553/00—Sensing or detecting means
  • B65H2553/40—Sensing or detecting means using optical, e.g. photographic, elements
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
  • B65H2553/00—Sensing or detecting means
  • B65H2553/40—Sensing or detecting means using optical, e.g. photographic, elements
  • B65H2553/41—Photoelectric detectors

Definitions

• the present invention relates to a method for determining the winding quality of a film roll of a film on a winding roll and a monitoring device for monitoring the winding quality of a film roll of a film on a winding roll.
• the winding quality is monitored.
• the winding density is monitored. This is usually done by calculating or balancing the current winding process. Such a method is z. As described in DE 41 16 081 A1. Disadvantageous in the determination of the winding density, however, is the high computational control effort and the multiplicity of different operating parameters which must be continuously monitored. From this indirect calculation of the winding density follows a total of a higher inaccuracy in the determination of the winding quality. In addition to the winding density, it is also known that the winding hardness makes a statement about the winding quality of the film roll. So z. B.
• the winding hardness can be determined as a measure of the winding quality. Disadvantage of the recent determination of the winding hardness, however, is that this can be done only after completion of the winding process.
• a measure of the winding hardness can be made by measuring the force on withdrawal of these individual pieces of paper. At this time, however, the take-up is already completed. Possibly too hard or too soft winding and therefore poor winding quality outside the default values is thus recognized only at a time when no rules or no intervention in the winding more is possible.
• this winding has a poor quality and can only be supplied to the processing at reduced prices or not at all.
• the total profile control for film rolls from DE 36 31 503 is known to produce a uniform winding quality across the width of the film roll.
• the regulation described therein does not take into account the balancing properties of the air layers between the film layers, so that the film profile is unnecessarily strongly influenced.
• An inventive method is used to determine the winding quality of a film roll of a film on a winding roll.
• Such a method according to the invention comprises the following steps:
• the winding hardness As a measure of the winding quality so the winding hardness is used in the context of the present invention.
• Core idea of the present invention is the monitoring of the winding hardness and the corresponding determination of the winding hardness already during the Winding.
• the actual winding quality can already be determined in this way during the winding process and, accordingly, a prediction can be made on the winding quality to be achieved after completion of the winding process. If the determined winding hardness changes out of the desired specification range, that is to say if it exceeds one or more preset values, then control technology can intervene. This can be a simple stop of the rewinder and manual readjustment by the operator.
• the winding quality of a film roll is to be seen in particular with respect to self-adjusting defects. Possible reductions in winding quality are z. B. too soft winding, which can lead to the so-called telescoping of the film roll. This means that if the foil rolls are too soft, the individual layers can be shifted against each other. In the axial direction of the film roll so that a telescopic moving and pulling apart of the individual film layers can be done. This is absolutely necessary to avoid, since otherwise further processing of the film roll by unwinding this film roll only makes it difficult or even impossible.
• Winding pox are essentially punctiform air inclusions between the individual layers of the film, which are reflected in local overstretching or locally increased stress situations within the film. This can lead to damage or even destruction of the film at the respective position.
• Piston rings result in particular by different film thicknesses.
• the piston rings can also be monitored or even avoided by a corresponding accurate knowledge of the winding hardness and, accordingly, the adjusting winding quality.
• other measures such as z.
• determining the winding hardness of the film roll is preferably carried out a continuous monitoring during the entire winding process.
• completely the entire winding hardness can be monitored starting from the winding roll to the outermost film layer of the film roll.
• it is simpler and less expensive if only the outermost layers, in particular the outermost two layers of the film of the film roll, are monitored for the winding hardness. If this occurs at discrete time intervals or even continuously or semicontinuously, a conclusion can also be drawn about film layers lying further inside and the air layers in between. This can be created in a cost effective and simple manner a substantially complete profile of the winding hardness over the entire radial cross section of the film roll.
• Even complex winding hardness profiles, ie non-constant winding hardness over the radial course of the film roll are thus determinable or even controllable when used for the control of operating parameters.
• the determination of the winding hardness in particular in a direct manner to the film roll.
• This direct determination of the winding hardness according to the invention can be simplified to the effect that the determination of the winding hardness takes place only for the outer layers of the film roll, in particular only for the outermost two layers. This reduces the effort of monitoring and the complexity of the sensors. The speed of the determination is also increased, so that the monitoring can take place during the ongoing winding operation.
• the outermost layers of the film roll are related to the respective time in the winding process. This means that it is at the outermost layers for which the determination of the winding hardness is carried out is not about explicit sections of the film roll, but rather is the respective outer layers of the film roll. The outermost layers of the film roll are thus the radially outermost at the time most distant layers of the film roll.
• Another core idea of the present invention is the implementation of the method already during winding. This can be taken as an additional part of the process influencing the winding parameters of the winding process or the winding process can even be stopped altogether.
• a control loop with the winding hardness of the film roll can be provided as an input value to this invention, so to speak, as will be explained later.
• a method according to the invention is particularly useful in films, for. B. plastic films used. It can, for. B. when winding at the end of a so-called film extrusion line, in particular a blown film extrusion line, are used. Of course, a method according to the invention, however, also in other applications, eg. B. when winding film-like or paper-like printed products use.
• a method according to the invention is in particular executable by a monitoring device. This can be provided with a control device which executes the method according to the invention in a corresponding monitoring device.
• a method according to the invention can be further developed such that at least the step of determining the winding hardness of the film roll, in particular also the further steps of the process, takes place continuously or substantially continuously.
• the step of determining the winding hardness can thus be carried out in a more cost-effective manner. It is therefore sufficient that the outermost layers of film of the film roll, at least the two outermost layers of film, are monitored with regard to the winding hardness. This results in the circumferential direction over the course of a continuous or substantially continuous monitoring, in a simple and cost-effective manner to a radial course of the winding hardness over the radial extent the film wrap can be converted. This can cost and simple sensors are used.
• the continuous or essentially continuous determination further serves to facilitate the usability of the particular film quality for a regulation of the entire apparatus.
• a controlled system which uses the deviation or the specific winding quality as the input variable for the regulation of operating parameters of a take-up device. This can be done not only a warning in worsening winding quality, but even an intervention in the winding process. The aim of this intervention is to bring the winding quality back into the default range, ie into the desired correlation to at least one default value.
• the step of determining the winding hardness of the film roll during the winding is carried out without contact.
• a non-contact measurement brings decisive advantages, since the sensor can be arranged small and spaced from the surface of the outermost layer of film of the film roll. Also, a non-contact measuring method will reduce the influence of the film to a minimum. Friction or abrasion between a sensor device for determining the winding hardness and the respective film surface can be substantially completely avoided in this way. Also, the non-contact measurement may preferably allow a smaller dependence on the distance between the associated sensor device and the surface of the film.
• the step of determining the winding hardness of the film roll during the winding is carried out by means of at least one of the following methods:
• measuring methods which can perform the determination of the winding hardness without contact.
• this is an ultrasonic measurement, which can perform a determination of the winding hardness by determining the feedback of an ultrasonic signal.
• the use of laser measurement technology can also generate a corresponding determination of the winding hardness by way of the quality and / or quantity of the feedback of the laser signal. Radar measurement can be performed in the same way without contact.
• a contact roller is also a particularly cost-effective way to carry out a method according to the invention with regard to the determination of the winding hardness.
• a touching method is provided, which is significantly cheaper to carry out compared to non-contact method.
• At least two default values define a default range as the upper default value and as the lower default value.
• the winding hardness gets provided as a reference for the winding quality a target range.
• the winding hardness should be in order to achieve a winding quality of the film roll in an also associated default range.
• the winding quality should not be too hard and not too soft. Too hard winding quality could lead to damage of the film when winding up, for example, by piston rings or winding pox. Too soft winding quality could lead to the already described problems of telescoping or other winding defects.
• Deviations from the default range are used in particular for the regulation of operating parameters when winding the film. It goes without saying that a default mean value can also be defined in a default range, with deviations from the default mean value already allowing a control which allows an effect even before it leaves the default range. This can be counteracted that the value for the winding hardness does not leave the defined default range at all.
• a step for the input of at least one operating parameter is carried out, which influences the winding quality.
• these operating parameters are formed in particular in a specific manner based on the dimensions of the film of the film roll.
• the input of operating parameters allows in manual, semi-automatic or even as a controlled system fully automatic way, a change in the specifications for the winding. This change in the specifications allows an influence and thus a change in the winding hardness to be determined.
• this input of the operating parameters takes place in a specific manner. This is to be understood as referring to geometric dimensions of the film. For example, webs are no longer indicated by a contact roller or the winding roll on the film in an absolute manner, ie as a force in N, but in a specific manner based on the cross-sectional area of the film, ie in N / mm 2 .
• a pressing force of the contact roller is no longer input absolutely as a force in N, but as a pressing force in a specific manner in N / mm based on the width of the film.
• the use of specific operating parameters makes it possible to specify them once and thus to use them continuously for a wide variety of film inserts.
• the unique specification of specific operating parameters can accordingly be understood as a semi-automated adjustment of the winding process.
• an associated control device can use these specific operating parameters to set the actual absolute values for contact force and web tension in the take-up device.
• the specific winding quality and / or the specific deviation is used as the input variable for the control of at least one operating parameter which influences the winding quality.
• these are at least one of the following operating parameters:
• the contact roller is used in a winding device for generating a contact pressure during the winding operation against the outermost film layer of the film roll.
• the web tension within the film is provided by the two rollers, so the contact roller on the one hand and the winding roller on the other.
• Each of these two webs together creates the entire web tension in the film, so that two different operating parameters, namely the web tension through the contact roller and the web tension through the winding roller can be adjusted for the web tension of the film.
• specific parameters are used here in order to further reduce the regulatory effort, as has been explained in the preceding paragraph.
• a desired winding quality can be achieved with high reliability. Deviations are recognized in good time and reduced again by automatic readjustment, so that as a result of the winding process, a film roll with a winding quality results in the defined default range.
• a further advantage is achieved if, in the case of a method according to the invention, the radial pressure profile that occurs during the winding of the film roll is taken into account in the regulation of the at least one operating parameter.
• the outer film layers further influence the inner film layers. This is to be compared with rubber bands that are placed one above the other around a winding roll.
• the outermost layers of film exert an additional force on the innermost layers of film. This causes air cushion between the inner layers of film over the course of Aufwickeins reduce, since the applied pressure force from the outside air is forced out of these air cushions.
• the final winding hardness in the interior of the film roll differs from the winding hardness, as it has been determined at the respective Aufwickelzeittician these inner layers.
• the inner layers were still the outermost layer of the film roll.
• a consideration of the pressure curve that results is preferably stored, which takes into account the film weight, the film diameter or other parameters.
• the consideration of the pressure curve can thus be used for the control to an exact radial pressure curve or an exact radial course of the winding hardness to adjust over the film wrap.
• a method according to the invention in a direction transverse to the winding direction of the film, at least two-fold section-wise determination of the winding hardness of the film roll takes place during the winding of the winding roll.
• the section-wise detection can be provided by high-resolution sensors, which are distributed over this transverse direction.
• a mechanical movement of the sensor in a traversing manner is conceivable in the sense of this embodiment and the invention.
• An axial resolution of the winding hardness brings particular advantages in terms of avoiding the problem of piston rings.
• a method according to the invention can be further developed in order to be able to ensure the security of compliance with the winding quality over the axial course of the film roll.
• the winding hardness and / or a manufacturing profile of the film by the control of at least one operating parameter is kept constant or substantially constant.
• the width direction ie substantially parallel to the axis of rotation of the film roll
• a homogenization of the winding quality is achieved.
• a substantially uniform winding profile can thus be produced.
• a method according to the invention can also be developed in such a way that, based on a specific winding quality and / or the determined deviation, a change in a production profile of the films is carried out a preceding production process.
• This is in particular an extrusion process of a film, preferably a blown film extrusion process.
• a reversing of the film can be dispensed with.
• such an embodiment of the method takes place in combination with the sectional monitoring in the axial direction, so that an associated control of the defined sections of Slide profile is possible.
• Another object of the present invention is a monitoring device for monitoring the winding quality of a film roll of a film on a winding roll, comprising at least one sensor device.
• This at least one sensor device is designed for determining the winding hardness of the film roll during the winding of the film on the winding roll.
• a monitoring device according to the invention has a control device which is designed to determine a deviation of the determined winding hardness of the film roll from at least one standard value for the winding hardness of the film roll.
• a control device for determining the winding quality of the film roll is formed based on the determined deviation. It is advantageous if a monitoring device according to the invention is provided with a control device which is designed for carrying out a method according to the invention. Accordingly, a monitoring device according to the invention brings the same advantages as have been explained in detail with reference to a method according to the invention.
• the inventive method can be used to simplify the complex operation of today's winding machines.
• the previous manual specification of the winding parameters is supplemented by a semi-automatic and / or fully automatic control option.
• the control device is preferably designed so that the semi-automatic and the fully automatic process during all production phases can be easily activated and deactivated directly by the operator.
• Fig. 5 is an illustration of a time course of the determination of the winding hardness
• Fig. 6 is a schematic representation of the intervention variables of the operating parameters on the film.
• FIG. 1 shows schematically a winding device with a winding roll 20, on which a film roll 10 is generated.
• the winding roll 20 is rotated and a film 30 wound on her.
• a contact roller 40 is provided, which exerts a corresponding contact pressure AD on the film roll.
• a monitoring device 100 is provided. This is equipped with a sensor device 1 10 and a control device 120.
• This sensor device 110 is designed to determine the winding hardness in the course of the winding process, at least in the uppermost layers of the film 30. This determination is carried out in particular contactless, z. B. by ultrasonic measurement.
• the control device 120 may be designed to control the operating parameters. This is represented by the dotted connecting lines between the control device 120 and the winding roller 20 and the contact roller 40.
• FIG. 2 shows a first embodiment of a film roll 10, wherein the film layers 30 have relatively small air gaps 60 between them exhibit. This corresponds to a relatively hard embodiment with regard to the winding hardness WH of the film roll 10.
• FIG. 3 shows larger air gaps 60 between the individual foils 30, so that a softer winding hardness WH of the corresponding film roll 10 also sets accordingly.
• the influencing variables, which lead to different winding hardnesses WH, will be explained in more detail later with reference to FIG.
• FIG. 4 schematically shows that the course of the winding hardness WH in the radial direction of the film roll 10 does not necessarily have to be constant. Rather, it is possible that the winding hardness WH in the interior of the film roll 10, ie at the radial region around the winding roll 20 around, is significantly greater than in the outermost film layer region of the film roll 10. This can be influenced on the subsequent processing or on the adjusting pressure curve in the radial direction of the film roll 10th
• FIG. 5 shows a schematic representation of how the determined winding hardness WH represents over the course of time.
• two default values V1 and V2 can be seen in this schematic diagram representation, which define a default range VB as upper limit and lower limit.
• V1 and V2 can be seen in this schematic diagram representation, which define a default range VB as upper limit and lower limit.
• V2 the default range
• V2 the upper specified value
• a control intervention will take place at the latest in order to reach the desired default range VB again.
• a control of operating parameters can take place, as will be described below with reference to FIG.
• the film 30 is shown schematically. It has a width from bottom left to top right and a corresponding film cross section, which can be seen at the right end.
• the so-called train BZ is directed.
• This web tension BZ is generated by corresponding winding speeds of the winding roll 20 and the contact roll 40.
• a web tension BZ results for the film 30, which is directed in the winding-up direction 50.
• This can be designed specifically and in particular be related to the film cross-section in N / mm 2 .
• the so-called contact pressure AD of the contact roller 40 acts. Also this can be formed in a specific manner and refer to the width, ie in N / mm, the film 30.
• V1 first default value

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• Winding Of Webs (AREA)
• Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)

Applications Claiming Priority (2)

Publications (1)

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Family Applications (1)

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• 2012
  • 2012-11-09 DE DE102012110790.4A patent/DE102012110790B4/de not_active Expired - Fee Related
• 2013
  • 2013-09-26 EP EP13771440.8A patent/EP2917140A1/de not_active Ceased
  • 2013-09-26 US US14/441,889 patent/US9731929B2/en not_active Expired - Fee Related
  • 2013-09-26 IN IN3724DEN2015 patent/IN2015DN03724A/en unknown
  • 2013-09-26 CN CN201380054252.6A patent/CN105008257B/zh not_active Expired - Fee Related
  • 2013-09-26 WO PCT/EP2013/070058 patent/WO2014072122A1/de active Application Filing

Non-Patent Citations (2)

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