WO2016130435A1 - Method for wrapping plastic film on a load and wrapping machine - Google Patents

Method for wrapping plastic film on a load and wrapping machine Download PDF

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Publication number
WO2016130435A1
WO2016130435A1 PCT/US2016/016825 US2016016825W WO2016130435A1 WO 2016130435 A1 WO2016130435 A1 WO 2016130435A1 US 2016016825 W US2016016825 W US 2016016825W WO 2016130435 A1 WO2016130435 A1 WO 2016130435A1
Authority
WO
WIPO (PCT)
Prior art keywords
wrapping
load
plastic film
film web
wrapped
Prior art date
Application number
PCT/US2016/016825
Other languages
French (fr)
Inventor
Janne HURME
Janne Koskela
Original Assignee
Signode Industrial Group Llc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Signode Industrial Group Llc filed Critical Signode Industrial Group Llc
Priority to US15/543,447 priority Critical patent/US20180050832A1/en
Priority to EP16705680.3A priority patent/EP3256390A1/en
Publication of WO2016130435A1 publication Critical patent/WO2016130435A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B57/00—Automatic control, checking, warning, or safety devices
    • B65B57/10—Automatic control, checking, warning, or safety devices responsive to absence, presence, abnormal feed, or misplacement of articles or materials to be packaged
    • B65B57/12—Automatic control, checking, warning, or safety devices responsive to absence, presence, abnormal feed, or misplacement of articles or materials to be packaged and operating to control, or stop, the feed of wrapping materials, containers, or packages
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B11/00—Wrapping, e.g. partially or wholly enclosing, articles or quantities of material, in strips, sheets or blanks, of flexible material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B11/00—Wrapping, e.g. partially or wholly enclosing, articles or quantities of material, in strips, sheets or blanks, of flexible material
    • B65B11/02—Wrapping articles or quantities of material, without changing their position during the wrapping operation, e.g. in moulds with hinged folders
    • B65B11/025—Wrapping articles or quantities of material, without changing their position during the wrapping operation, e.g. in moulds with hinged folders by webs revolving around stationary articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B11/00—Wrapping, e.g. partially or wholly enclosing, articles or quantities of material, in strips, sheets or blanks, of flexible material
    • B65B11/58—Applying two or more wrappers, e.g. in succession
    • B65B11/585—Applying two or more wrappers, e.g. in succession to stacked articles, e.g. pallettised loads
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B41/00—Supplying or feeding container-forming sheets or wrapping material
    • B65B41/12—Feeding webs from rolls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B57/00—Automatic control, checking, warning, or safety devices
    • B65B57/02—Automatic control, checking, warning, or safety devices responsive to absence, presence, abnormal feed, or misplacement of binding or wrapping material, containers, or packages
    • B65B57/04—Automatic control, checking, warning, or safety devices responsive to absence, presence, abnormal feed, or misplacement of binding or wrapping material, containers, or packages and operating to control, or to stop, the feed of such material, containers, or packages
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B59/00—Arrangements to enable machines to handle articles of different sizes, to produce packages of different sizes, to vary the contents of packages, to handle different types of packaging material, or to give access for cleaning or maintenance purposes
    • B65B59/001—Arrangements to enable adjustments related to the product to be packaged
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B59/00—Arrangements to enable machines to handle articles of different sizes, to produce packages of different sizes, to vary the contents of packages, to handle different types of packaging material, or to give access for cleaning or maintenance purposes
    • B65B59/003—Arrangements to enable adjustments related to the packaging material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B59/00—Arrangements to enable machines to handle articles of different sizes, to produce packages of different sizes, to vary the contents of packages, to handle different types of packaging material, or to give access for cleaning or maintenance purposes
    • B65B59/02—Arrangements to enable adjustments to be made while the machine is running
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B2210/00—Specific aspects of the packaging machine
    • B65B2210/04—Customised on demand packaging by determining a specific characteristic, e.g. shape or height, of articles or material to be packaged and selecting, creating or adapting a packaging accordingly, e.g. making a carton starting from web material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B2210/00—Specific aspects of the packaging machine
    • B65B2210/14—Details of wrapping machines with web dispensers for application of a continuous web in layers onto the articles
    • B65B2210/16—Details of wrapping machines with web dispensers for application of a continuous web in layers onto the articles the web dispenser travelling around the article along a non-rotating ring
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B2210/00—Specific aspects of the packaging machine
    • B65B2210/14—Details of wrapping machines with web dispensers for application of a continuous web in layers onto the articles
    • B65B2210/18—Details of wrapping machines with web dispensers for application of a continuous web in layers onto the articles the web dispenser being mounted on a rotary ring

Definitions

  • the present invention relates to wrapping of a plastic film web on a load.
  • the plastic film web is wrapped around a load either by rotating rolls of plastic film web around a pallet or by rotating a pallet with respect to rolls of plastic film web, or by conducting both at the same time, whereby the rolls of plastic film web are also simultaneously shifted in vertical direction.
  • Wrapping machines are also typically fitted with elements for providing a piece of film web for covering a top surface of the load to be wrapped.
  • the film is usually also pre-stretched to a certain degree prior to wrapping the film around the load.
  • the stretched film provides secure protection of the wrapped load and helps to keep the wrapped products at their places on the pallet.
  • the stretching of the film also lowers the thickness of the film and thus less film material is used in the wrapping of the load.
  • One way of moving rolls of film web around a stationary pallet and a load thereon is to provide the wrapping machine with a horizontally placed, ring-shaped circular guide, said circular guide being fitted with one or more film supply carriages comprising a roll of film web.
  • a circular guide structure can be formed for example from a circular guide ring mounted on a frame of the wrapping machine in a vertically movable manner, and from a circular guide ring capable of rotating relative to the stationary circular guide ring, said rotating circular guide ring being fitted with film supply carriages.
  • the circular guide structure of a wrapping machine may consist of just one circular guide ring, which is mounted on a frame of the wrapping machine either rotatably or non- rotatably, as well as to be movable in vertical direction.
  • One wrapping machine solution based on the use of circular guides is known from patent publication US 4,587,796.
  • the wrapping process in the known machines is generally carried out so, that the wrapping process is started either from the bottom portion of the load and the wrapping proceed upwards along the load, or from the top portion of the load and the wrapping proceeds downwards along the load, until the whole load is wrapped.
  • double layer wrapping where the load is wrapped twice, for example from bottom to top and back to bottom.
  • the present invention provides a wrapping method, and a wrapping machine implementing this kind of method, where the wrapping characteristics can be preset so that they are charged during the wrapping process at predefined points or locations and/or between these predefined points or locations. This allows for proper wrapping also for loads that have varying characteristics at different locations along the load to be wrapped, so that the whole load does not need to be wrapped the same way. Further, the present invention also allows the operator of the wrapping machine to freely set the points and locations together with the wrapping characteristics for the load to be wrapped which makes it possible to form many different kinds of wrapping modes and ways without the need to change the program controlling the wrapping machine.
  • At least one roll of plastic film web in relation to at least the height of the load to be wrapped is detected and monitored during wrapping, a plurality of points or locations along the height of the load to be wrapped are preset before starting of the wrapping, at which preset points or locations and/or between said preset points or locations the wrapping characteristics are changed during wrapping.
  • the said wrapping characteristics include wrapping height, number of plastic film web layers wrapped, tension of the plastic film web, wrapping speed, amount of overlap of subsequent wrapping rounds and/or overlap tension.
  • the points or locations and/or the wrapping characteristics are set by an operator of the wrapping machined through user interface prior to starting of the wrapping of the load. This allows changing of the wrapping characteristics whenever the loads to be wrapped vary in type or composition, for example, by the operator, even for each single load to be wrapped if necessary.
  • the load to be wrapped is stationary and a film web roll is rotated around the load during the wrapping.
  • the plastic film web is pre-stretched before wrapping it around the load.
  • the present invention also provides a wrapping machine for wrapping a plastic film web on a load comprising at least one roll of plastic film web, a device for detecting and monitoring the location of the at least one roll of plastic film web in relation to at least the height of the load to be wrapped during wrapping, a device for defining preset points along the height of the load, and a device for changing the wrapping characteristics at and/or between the preset points during wrapping.
  • the said devices comprise at least one processor or processing unit and at least one memory including computer program code, wherein the at least one memory and the program code are configured to, with the at least one processor or processing unit, control the motors of the wrapping machine moving the at least one roll of plastic web in relation to the load to be wrapped and/ or a motor for feeding the plastic film web.
  • the at least one memory and the program code are configured to, with the at least one processor or processing unit, control the wrapping characteristics during the wrapping so that wrapping height changes, number of wrapped plastic film web layers changes, tension of the plastic film web changes wrapping speed changes, amount of overlap of subsequent wrapping rounds changes and/or overlap changes.
  • the device for detecting and monitoring the location of the at least one roll of plastic film web in relation to at least the height of the load to be wrapped during wrapping comprises an encoder arranged in connection of a motor moving the at least one roll of plastic film in vertical direction, and a photocell.
  • the wrapping machine comprises an automatic control system for controlling the wrapping machine and the said devices, with a user interface for setting the preset points and/or the wrapping characteristics before wrapping.
  • the wrapping machine comprises a device for rotating the at least one roll of plastic film web around a stationary load.
  • This device preferably comprises a circular guide along which the roll or rolls of plastic film web are moved, and the circular guide is connected vertically adjustably on a frame of the wrapping machine.
  • the wrapping machine also comprises a device for pre-stretching the plastic film before it is wrapped on a load.
  • Figure 1 shows schematically an embodiment of a wrapping machine utilizing the present invention
  • Figure 2 shows schematically the principle of controlling and setting of the wrapping process of the invention.
  • Figure 1 shows schematically a wrapping machine 1, which comprises a frame 2, a circular guide 3 connected to the frame vertically adjustably, and a carrier 4 for roll of plastic film web 9, which carrier is movable along the circular guide.
  • Load to be wrapped is brought, usually on a suitable pallet, under the circular guide 3 in the area inside the circular guide with a suitable forklift or conveyer belt passing though the wrapping machine 1, for example.
  • the circular guide 3 is first lowered downwards until the load to be wrapped cuts a light beam from a photocell connected to the circular guide, at which moment the vertical position of the circular guide is registered and used to determine the height of the load to be wrapped by an automatic control system controlling the wrapping machine and its wrapping process.
  • the wrapping machine 1 also comprises a user interface 5, which is used to input data, or select corresponding setting, relating to the type of pallet into the automatic control system on which the load to be wrapped in located, so that the automatic control system knows the level from which the wrapping is to be started or at which is to be ended at the lower end of the load to be wrapped.
  • Another encoder is arranger in the motor 7 which rotates the carrier 4 along the circular guide 3, which also forwards data of the location of the carrier 4 on the circular guide to the automatic control system of the wrapping machine 1.
  • the automatic control system which comprises suitable data processing means and devices, such as data processors or processing units, memories and computer program codes, determines and follows the location of the roll of plastic film web 9 in relation to the load to be wrapped.
  • the automatic control system also controls a motor 8 for feeding the plastic film web from the carrier 4, which motor is located in the carrier, so that the feeding of the plastic film web is adjusted accordingly with the changes in the other wrapping characteristics during wrapping.
  • the user interface 5 also allows the operator of the wrapping machine 1 to input different settings and changes to the automatic control system of the wrapping machine before the wrapping process is stated, so that suitable wrapping for different kinds of loads to be wrapped can be obtained. This is discussed in more detail below in connection to figure 2.
  • Figure 2 shows schematically the principle of controlling and setting of the wrapping process of the invention.
  • the user sets the points or locations along the height of the load to be wrapped, which are shown in figure 2 as numbered circles.
  • the location of points can be defined as distance from the pallet top surface or from the top of the load to be wrapped, for example.
  • the amount of the set points or locations may be between 1-5, preferably 3-5.
  • wrapping characteristics may include:
  • the user may freely set the points and locations along the height of the load to be wrapped as well as the related wrapping characteristics, which allows the same wrapping machine to be used in multitude of different wrapping modes and ways without the need to make changes to the programmable logic, i.e. the automatic control system, controlling the wrapping machine.
  • the programmable logic i.e. the automatic control system, controlling the wrapping machine.
  • the selected settings may also be saved into the automatic control system of the wrapping machine, so that the saved settings can be retrieved to be used again.
  • the changes to the wrapping characteristics during the wrapping process are carried out by the automatic control system of the wrapping machine based on the location information of the roll of plastic film web and controlling of the motors moving the roll of plastic film web.

Abstract

A method and wrapping machine for wrapping a plastic film web from at least one roll (9) on a load with a wrapping machine (1), wherein the location of the at least one roll (9) of plastic film web in relation to at least the height of the load to be wrapped is detected and monitored during wrapping, a plurality of points or locations along the height of the load to be wrapped are preset before starting of the wrapping, at which preset points or locations and/or between said preset points or locations the wrapping characteristics are changed during wrapping.

Description

TITLE
Method for wrapping plastic film on a load and wrapping machine
[0001] This international application claims priority to and the benefit of Finland Patent Application No. 20155083, filed on February 9, 2015, the entire contents of which are incorporated herein by reference.
[0002] The present invention relates to wrapping of a plastic film web on a load.
[0003] Various types of wrapping machines for wrapping a web type plastic film around an article being packaged are previously known. The article to be packaged is typically a pallet-mounted load, sail load being usually an entity in the form of a rectangular parallelepiped.
[0004] The plastic film web is wrapped around a load either by rotating rolls of plastic film web around a pallet or by rotating a pallet with respect to rolls of plastic film web, or by conducting both at the same time, whereby the rolls of plastic film web are also simultaneously shifted in vertical direction. Wrapping machines are also typically fitted with elements for providing a piece of film web for covering a top surface of the load to be wrapped.
[0005] During the wrapping process the film is usually also pre-stretched to a certain degree prior to wrapping the film around the load. The stretched film provides secure protection of the wrapped load and helps to keep the wrapped products at their places on the pallet. The stretching of the film also lowers the thickness of the film and thus less film material is used in the wrapping of the load.
[0006] One way of moving rolls of film web around a stationary pallet and a load thereon is to provide the wrapping machine with a horizontally placed, ring-shaped circular guide, said circular guide being fitted with one or more film supply carriages comprising a roll of film web. Such a circular guide structure can be formed for example from a circular guide ring mounted on a frame of the wrapping machine in a vertically movable manner, and from a circular guide ring capable of rotating relative to the stationary circular guide ring, said rotating circular guide ring being fitted with film supply carriages. Alternatively, the circular guide structure of a wrapping machine may consist of just one circular guide ring, which is mounted on a frame of the wrapping machine either rotatably or non- rotatably, as well as to be movable in vertical direction. One wrapping machine solution based on the use of circular guides is known from patent publication US 4,587,796.
[0007] The wrapping process in the known machines is generally carried out so, that the wrapping process is started either from the bottom portion of the load and the wrapping proceed upwards along the load, or from the top portion of the load and the wrapping proceeds downwards along the load, until the whole load is wrapped. With some machines it is possible to carry out double layer wrapping, where the load is wrapped twice, for example from bottom to top and back to bottom.
[0008] The present invention provides a wrapping method, and a wrapping machine implementing this kind of method, where the wrapping characteristics can be preset so that they are charged during the wrapping process at predefined points or locations and/or between these predefined points or locations. This allows for proper wrapping also for loads that have varying characteristics at different locations along the load to be wrapped, so that the whole load does not need to be wrapped the same way. Further, the present invention also allows the operator of the wrapping machine to freely set the points and locations together with the wrapping characteristics for the load to be wrapped which makes it possible to form many different kinds of wrapping modes and ways without the need to change the program controlling the wrapping machine.
[0009] In the method of the invention for wrapping a plastic film web from at least one roll on a load with a wrapping machine, at least one roll of plastic film web in relation to at least the height of the load to be wrapped is detected and monitored during wrapping, a plurality of points or locations along the height of the load to be wrapped are preset before starting of the wrapping, at which preset points or locations and/or between said preset points or locations the wrapping characteristics are changed during wrapping.
[0010] In an embodiment of the method of the invention the said wrapping characteristics include wrapping height, number of plastic film web layers wrapped, tension of the plastic film web, wrapping speed, amount of overlap of subsequent wrapping rounds and/or overlap tension.
[0011] In an embodiment of the method of the invention the points or locations and/or the wrapping characteristics are set by an operator of the wrapping machined through user interface prior to starting of the wrapping of the load. This allows changing of the wrapping characteristics whenever the loads to be wrapped vary in type or composition, for example, by the operator, even for each single load to be wrapped if necessary.
[0012] In an embodiment of the method of the invention the load to be wrapped is stationary and a film web roll is rotated around the load during the wrapping.
[0013] In an embodiment of the method of the invention the plastic film web is pre-stretched before wrapping it around the load.
[0014] The present invention also provides a wrapping machine for wrapping a plastic film web on a load comprising at least one roll of plastic film web, a device for detecting and monitoring the location of the at least one roll of plastic film web in relation to at least the height of the load to be wrapped during wrapping, a device for defining preset points along the height of the load, and a device for changing the wrapping characteristics at and/or between the preset points during wrapping.
[0015] In an embodiment of the wrapping machine of the invention the said devices comprise at least one processor or processing unit and at least one memory including computer program code, wherein the at least one memory and the program code are configured to, with the at least one processor or processing unit, control the motors of the wrapping machine moving the at least one roll of plastic web in relation to the load to be wrapped and/ or a motor for feeding the plastic film web.
[0016] In an embodiment of the wrapping machine of the invention the at least one memory and the program code are configured to, with the at least one processor or processing unit, control the wrapping characteristics during the wrapping so that wrapping height changes, number of wrapped plastic film web layers changes, tension of the plastic film web changes wrapping speed changes, amount of overlap of subsequent wrapping rounds changes and/or overlap changes.
[0017] In an embodiment of the wrapping machine of the invention the device for detecting and monitoring the location of the at least one roll of plastic film web in relation to at least the height of the load to be wrapped during wrapping comprises an encoder arranged in connection of a motor moving the at least one roll of plastic film in vertical direction, and a photocell. [0018] In an embodiment of the wrapping machine of the invention the wrapping machine comprises an automatic control system for controlling the wrapping machine and the said devices, with a user interface for setting the preset points and/or the wrapping characteristics before wrapping.
[0019] In an embodiment of the wrapping machine of the invention the wrapping machine comprises a device for rotating the at least one roll of plastic film web around a stationary load. This device preferably comprises a circular guide along which the roll or rolls of plastic film web are moved, and the circular guide is connected vertically adjustably on a frame of the wrapping machine.
[0020] In an embodiment of the wrapping machine of the invention the wrapping machine also comprises a device for pre-stretching the plastic film before it is wrapped on a load.
[0021] The features defining a method of the invention are more precisely disclosed in claim 1 , and the features defining a wrapping machine of the invention are more precisely disclosed in claim 6. Dependent claims disclose advantageous features and embodiments of the invention.
[0022] In the following an exemplifying embodiment of the invention is discussed in greater detail in the sense of example and with reference to accompanying drawings, where,
[0023] Figure 1 shows schematically an embodiment of a wrapping machine utilizing the present invention, and
[0024] Figure 2 shows schematically the principle of controlling and setting of the wrapping process of the invention.
[0025] Figure 1 shows schematically a wrapping machine 1, which comprises a frame 2, a circular guide 3 connected to the frame vertically adjustably, and a carrier 4 for roll of plastic film web 9, which carrier is movable along the circular guide.
[0026] Load to be wrapped is brought, usually on a suitable pallet, under the circular guide 3 in the area inside the circular guide with a suitable forklift or conveyer belt passing though the wrapping machine 1, for example. Once the wrapping process is started, the circular guide 3 is first lowered downwards until the load to be wrapped cuts a light beam from a photocell connected to the circular guide, at which moment the vertical position of the circular guide is registered and used to determine the height of the load to be wrapped by an automatic control system controlling the wrapping machine and its wrapping process.
[0027] The wrapping machine 1 also comprises a user interface 5, which is used to input data, or select corresponding setting, relating to the type of pallet into the automatic control system on which the load to be wrapped in located, so that the automatic control system knows the level from which the wrapping is to be started or at which is to be ended at the lower end of the load to be wrapped.
[0028] The vertical position of the circular guide 3, and thus also the vertical location of the roll of plastic film web 9 located in a carrier 4 connected to the circular guide, is defined and monitored with an encoder arranged in the motor 6 moving the circular guide vertically along the frame 2. The encoder forwards the location data to the automatic control system of the wrapping machine 1.
[0029] Another encoder is arranger in the motor 7 which rotates the carrier 4 along the circular guide 3, which also forwards data of the location of the carrier 4 on the circular guide to the automatic control system of the wrapping machine 1.
[0030] Based on the data obtained from the two encoders, the automatic control system, which comprises suitable data processing means and devices, such as data processors or processing units, memories and computer program codes, determines and follows the location of the roll of plastic film web 9 in relation to the load to be wrapped.
[0031] The automatic control system also controls a motor 8 for feeding the plastic film web from the carrier 4, which motor is located in the carrier, so that the feeding of the plastic film web is adjusted accordingly with the changes in the other wrapping characteristics during wrapping.
[0032] The user interface 5 also allows the operator of the wrapping machine 1 to input different settings and changes to the automatic control system of the wrapping machine before the wrapping process is stated, so that suitable wrapping for different kinds of loads to be wrapped can be obtained. This is discussed in more detail below in connection to figure 2.
[0033] Figure 2 shows schematically the principle of controlling and setting of the wrapping process of the invention. [0034] At the start of the setting process the user sets the points or locations along the height of the load to be wrapped, which are shown in figure 2 as numbered circles. The location of points can be defined as distance from the pallet top surface or from the top of the load to be wrapped, for example. The amount of the set points or locations may be between 1-5, preferably 3-5.
[0035] Once the points are set, the user defines wrapping characteristics to be applied at the set points or between the set points. The wrapping characteristics may include:
- wrapping height,
- number of plastic film web layers wrapped,
- tension of the plastic film web,
- wrapping speed,
- amount of overlap of subsequent wrapping rounds, and/or
- overlap tension.
[0036] Once the set setting of points and wrapping characteristics is done, the user starts the actual wrapping process, which is the carried out by the wrapping machine, such as one shown in figure 1, in accordance with the settings.
[0037] The user may freely set the points and locations along the height of the load to be wrapped as well as the related wrapping characteristics, which allows the same wrapping machine to be used in multitude of different wrapping modes and ways without the need to make changes to the programmable logic, i.e. the automatic control system, controlling the wrapping machine.
[0038] The selected settings may also be saved into the automatic control system of the wrapping machine, so that the saved settings can be retrieved to be used again.
[0039] The changes to the wrapping characteristics during the wrapping process are carried out by the automatic control system of the wrapping machine based on the location information of the roll of plastic film web and controlling of the motors moving the roll of plastic film web.
[0040] The specific exemplifying embodiments of the invention shown in figures and discussed above should not be construed as limiting. A person skilled in the art can amend and modify the embodiments in many evident ways within the scope of the attached claims. Thus the invention is not limited merely to the embodiments described above.

Claims

1. A method for wrapping a plastic film web from at least one roll (9) on a load with a wrapping machine (1), characterized in that the location of the at least one roll (9) of plastic film web in relation to at least the height of the load to be wrapped is detected and monitored during wrapping, a plurality of points or locations along the height of the load to be wrapped are preset before starting of the wrapping, at which preset points or locations and/or between said preset points or locations the wrapping characteristics are changed during wrapping.
2. A method according to claim 1, wherein the said wrapping characteristics include wrapping height, number of plastic film web layers wrapped, tension of the plastic film web, wrapping speed, amount of overlap of subsequent wrapping rounds and/or overlap tension.
3. A method according to claim 1 or 2, wherein said points or locations and/or said wrapping characteristics are set by an operator of the wrapping machined through user interface (5) prior to starting of the wrapping of the load.
4. A method according to any of claims 1-3, wherein the load to be wrapped is stationary and the at least one film web roll (9) is rotated around the load during the wrapping.
5. A method according to any of claims 1-4, wherein the plastic film web is pre-stretched before wrapping it around the load.
6. A wrapping machine (1) for wrapping a plastic film web on a load, which wrapping machine comprises at least one roll (9) of plastic film web, characterized in that the wrapping machine (1) comprises a device for detecting and monitoring the location of the at least one roll of plastic film web in relation to at least the height of the load to be wrapped during wrapping, a device for defining preset points along the height of the load, and a device for changing the wrapping characteristics at and/or between the preset points during wrapping.
7. A wrapping machine (1) according to claim 6, wherein said devices comprise at least one processor or processing unit and at least one memory including computer program code, wherein the at least one memory and the program code are configured to, with the at least one processor or processing unit, control the motors (6, 7) of the wrapping machine moving the at least one roll (9) of plastic web in relation to the load to be wrapped and/or a motor (8) for feeding the plastic film web.
8. A wrapping machine (1) according to claim 7, wherein the at least one memory and the program code are configured to, with the at least one processor or processing unit, control the wrapping characteristics during the wrapping so that wrapping height changes, number of wrapped plastic film web layers changes, tension of the plastic film web changes wrapping speed changes, amount of overlap of subsequent wrapping rounds changes and/ or overlap changes.
9. A wrapping machine (1) according to any of claims 6-8, wherein the device for detecting and monitoring the location of the at least one roll (9) of plastic film web in relation to at least the height of the load to be wrapped during wrapping comprises an encoder arranged in connection of a motor (6) moving the at least one roll of plastic film in vertical direction, and a photocell.
10. A wrapping machine (1) according to any of claims 6-9, wherein the wrapping machine comprises an automatic control system for controlling the wrapping machine and the said devices, with a user interface (5) for setting the preset points and/or the wrapping characteristics before wrapping.
11. A wrapping machine (1) according to any of claims 6-10, wherein the wrapping machine comprises a device (3, 7) for rotating the at least one roll (9) of plastic film web around a stationary load.
12. A wrapping machine according to any of claims 6-11, wherein the wrapping machine (1) comprises a device (4, 8) for pre-stretching the plastic film.
PCT/US2016/016825 2015-02-09 2016-02-05 Method for wrapping plastic film on a load and wrapping machine WO2016130435A1 (en)

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FI20155083A FI20155083A (en) 2015-02-09 2015-02-09 A method of wrapping a plastic film on a load and a wrapping machine

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