EP4516709A1 - Wickelvorrichtung zur herstellung von bottom-first-beutelrollen - Google Patents

Wickelvorrichtung zur herstellung von bottom-first-beutelrollen Download PDF

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Publication number
EP4516709A1
EP4516709A1 EP23194157.6A EP23194157A EP4516709A1 EP 4516709 A1 EP4516709 A1 EP 4516709A1 EP 23194157 A EP23194157 A EP 23194157A EP 4516709 A1 EP4516709 A1 EP 4516709A1
Authority
EP
European Patent Office
Prior art keywords
crosswise
individual bags
interconnected individual
winding
winding apparatus
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
EP23194157.6A
Other languages
English (en)
French (fr)
Inventor
Birger Elmgaard SØRENSEN
Jens Peder Rasmussen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Roll-O-Matic AS
Original Assignee
Roll-O-Matic AS
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 Roll-O-Matic AS filed Critical Roll-O-Matic AS
Priority to EP23194157.6A priority Critical patent/EP4516709A1/de
Publication of EP4516709A1 publication Critical patent/EP4516709A1/de
Pending legal-status Critical Current

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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
    • B65H18/00—Winding webs
    • B65H18/08—Web-winding mechanisms
    • B65H18/10—Mechanisms in which power is applied to web-roll spindle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/74—Auxiliary operations
    • B31B70/92—Delivering
    • B31B70/94—Delivering singly or in succession
    • B31B70/942—Delivering singly or in succession by winding up
    • 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
    • B65H18/28—Wound package of webs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H35/00—Delivering articles from cutting or line-perforating machines; Article or web delivery apparatus incorporating cutting or line-perforating devices, e.g. adhesive tape dispensers
    • B65H35/04—Delivering articles from cutting or line-perforating machines; Article or web delivery apparatus incorporating cutting or line-perforating devices, e.g. adhesive tape dispensers from or with transverse cutters or perforators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2301/00—Handling processes for sheets or webs
    • B65H2301/50—Auxiliary process performed during handling process
    • B65H2301/51—Modifying a characteristic of handled material
    • B65H2301/515—Cutting handled material
    • B65H2301/5152—Cutting partially, e.g. perforating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/10—Handled articles or webs
    • B65H2701/19—Specific article or web
    • B65H2701/191—Bags, sachets and pouches or the like

Definitions

  • the invention relates to a winding apparatus for winding of bottom-first bag rolls, the winding apparatus comprising a perforator unit and a winding shaft.
  • the present invention further relates to a bottom-first bag roll making machine for making bottom-first bag rolls and a process for making bottom-first bag rolls.
  • Premade bags a used in many industries, and especially in packaging. In many applications, in particular for automatic bag inserting and other packaging application, it is desirable to unwind the premade bags with the bottom first (seal off first (SOF)). This means that the opening of the premade bags comes out last and thus in the right position for automatic filling or inserting in a box e.g., a packaging box.
  • SOF bottom first
  • a winding apparatus for production of bottom-first bag rolls comprising:
  • the winding apparatus further comprises at least one spindle, wherein the at least one spindle is configured for guiding the plurality of interconnected individual bags from the perforator unit to the winding shaft.
  • the perforator unit is set up to create crosswise perforations in the web tubular film, which preferably already has crosswise welds. This configuration allows for the formation of multiple interconnected individual bags.
  • the crosswise perforations result in transverse lines of weakness that connect the individual bags together.
  • the perforator unit is designed to create crosswise perforations in the web tubular film, defining individual bags as sections between downstream and upstream crosswise perforations. The downstream perforation forms the top and opening of each individual bag, which can be separated by breaking the transverse line of weakness.
  • the downstream crosswise perforation defines a top and opening of the individual bag when the individual bag is individualized by breaking the transverse line of weakness; whereas the upstream crosswise weld together with the upstream crosswise perforation defines the bottom part of the individual bag when the individual bag is individualized by breaking the transverse line of weakness.
  • the web tubular film is a web tubular plastic film, such that the individual bags will be in the form of individual plastic bags.
  • a winding apparatus as disclosed herein is a unit for winding-up bags or strips/lines of interconnected individual bags that create bags when individualized, such as plastic bags to create bag rolls hereof. It is a mechanical device used in the packaging industry to efficiently roll and wind bags onto a roll, core, tube, or a spool for easy storage and dispensing. Alternatively, the winding apparatus may be configured such that a core or spool is not needed, but the interconnects individual bags are winded around itself to create the centre around which the remaining interconnects bags a wound. The first interconnected bag would in that case correspond to being a core for the other interconnected bags to wound around.
  • This unit is commonly employed in factories or facilities that produce large quantities of bags, such as plastic bags, for various purposes, such as grocery bags, trash bags, or other disposable plastic bags.
  • a winding apparatus may typically comprise one or more of the following components:
  • a winding apparatus streamlines the packaging process, making it more efficient and reducing the storage space required for bags or interconnected bags. It also facilitates easy dispensing, as the wound (interconnected) bags can be easily unrolled and separated from the bag roll as needed for use.
  • bottom-first When manufacturing or winding bag rolls, there are two common methods: “bottom-first” and “top-first.”
  • bottom-first roll the film or material is initially fed onto the core from top to bottom. This means the outermost end of the bag roll will be the end of the interconnected bag that comprises the bottom of the last bag wound onto the core, i.e., the bottom weld of the bag.
  • top-first roll the film is initially fed onto the core from the bottom. This results in the opening of the last bag being the first the user meets when unrolling the bag roll, i.e., the top (broken) perforation of the bag making up the open end of the bag.
  • bottom-first bag roll is the bottom of the bag that is unrolled first when the bags are pulled off the bag roll. This means that it can easily be stuffed into a cardboard box or a container, so the container is quickly ready for filling and packing. Further, in many manual processes there will also be big advantages to unwind the bag roll with the bottom first as this is the right position for filling without turning the individualised bag upside down.
  • the bottom-first bag rolls are bottom-first plastic bag rolls.
  • a perforator unit as disclosed herein is a device or component used in various industries to create perforations or holes in materials, such as paper, cardboard, plastic, or metal.
  • the process of creating these holes is called perforating, and the resulting pattern of holes is referred to as perforations.
  • the perforator unit typically consists of a mechanism that houses the punch heads or pins and a means to control the spacing and pattern of the holes.
  • the process of perforating may be manual or automated, depending on the application and the level of precision required.
  • a winding shaft as disclosed herein also known as a winding mandrel or winding core, is a cylindrical device used in various industries for winding or coiling materials such as paper, film, fabric, plastic, wire, or other flexible materials into cores, tubes, rolls, or spools or around its own core.
  • the winding shaft serves as the central support around which the material is wrapped during the winding process.
  • the winding shaft is an essential component in winding apparatuses, rewinders, slitters, and other equipment used in manufacturing, converting, and packaging processes. It provides stability and tension control during the winding operation, ensuring that the material is evenly wound and properly aligned on the core/roll/tube/spool or arounds its own core.
  • a web tubular film having crosswise welds refers to a specific type of packaging film that is manufactured in a tubular form with crosswise welds or seals across the width of the film.
  • This type of film is commonly used in the packaging industry for various applications, such as creating bags or pouches.
  • the film may be produced in a continuous tube-like structure, with the edges sealed together to form a tube. It may alternatively be produced in other ways known in the art.
  • At regular intervals along the width of the tubular film there are crosswise welds or seals. These seals create separate compartments/segments/sections in the film, allowing for easy separation and forming of individual bags when the film is cut or perforated.
  • the web tubular film may be provided as a prefabricated web tubular film, where the term "prefabricated” indicates that the film is already manufactured and ready for use; however, the film may alternatively be created upstream of the winding apparatus in a continues process.
  • the film can be made from various materials, such as polyethylene (PE), polypropylene (PP), or other plastic resins, depending on the intended application and packaging requirements. In one or more embodiments, the film is made from polyethylene (PE).
  • downstream and upstream refer to different stages or positions relative to the direction of flow of the process. These terms are used to describe the sequence or order of events in the process or the movement of materials in the system.
  • Downstream refers to the stages or processes that come after a particular point in a sequence or workflow.
  • Upstream refers to the stages or processes that come before a particular point in a sequence or workflow. This means that downstream represents the stages or processes that come after a particular point in a sequence, while upstream represents the stages or processes that come before that point.
  • a crosswise weld as disclosed herein may also be called a "crosswise seal” or "transverse seal/weld.”
  • a crosswise weld refers to a sealing line or weld that runs substantially crosswise/transversally to the direction of the material's flow.
  • the crosswise weld may be formed in multiple different shapes, depending on the tool in the welding machine used to make the weld.
  • it is a crucial component in creating individual bags or pouches from a continuous roll or web of flexible material, such as plastic film.
  • a crosswise seal is formed by applying heat or pressure to fuse the flexible material together. This creates a secure and air-tight seal, dividing the continuous material into separate compartments/sections. Each compartment becomes an individual bag or pouch, ready to be filled with the desired contents when an opening is created, such as via a cut or a perforation that is broken.
  • a crosswise perforation as used herein refers to a series of small holes or perforations made across the width of the material, perpendicular to the direction of its flow or movement. These perforations are created to allow for easy separation or tearing of the material along the perforation line.
  • the crosswise perforation lines weaken the material along their path, enabling users or automated processes to tear or separate the material cleanly and efficiently.
  • the perforator unit When providing the crosswise perforation, the perforator unit is making individual bags interconnected along transverse lines of weakness, i.e., the crosswise perforations.
  • a bottom-first bag roll producing machine for producing bottom-first bag rolls, the machine comprising:
  • a process for producing bottom-first bag rolls comprises the following steps:
  • the plurality of interconnected individual bags are guided by the at least one spindle from the perforator unit to a winding shaft arranged to be rotated around its own axis.
  • the winding apparatus further comprises an inlet section, wherein the perforator unit is located at the inlet section.
  • An inlet section as disclosed herein refers to the initial part of the winding apparatus, within the working space of the winding apparatus, i.e., and inlet as being part of the winding apparatus and not further upstream of the processing line.
  • the perforator unit is configured to provide each crosswise perforation at a predetermined distance upstream from each crosswise weld. In one or more embodiments, the perforator unit is configured such that each crosswise perforation is made adjacent to each crosswise weld. Adjacent as used herein is when the perforation and the weld are almost directly next to each other or located side by side without considerable space in between. By considerable space is meant that the distance between the perforation and the weld is a factor of 10 smaller than the distance between two crosswise perforations or two crosswise welds.
  • the predetermined distance upstream from each crosswise weld is between 1 and 50 mm, such as between 1 and 40 mm, such as between 1 and 30 mm, such as between 1 and 25 mm, such as between 2 and 20 mm, or such as between 3 and 15 mm.
  • the perforator unit is configured such that each crosswise perforation is made within a range of 1 mm to 100 mm from the adjacent downstream crosswise weld. In one or more embodiments, the perforator unit is configured to provide a crosswise perforation between a downstream weld and an upstream weld, and closer to the downstream weld compared to the upstream weld.
  • the perforator unit is configured to provide the crosswise perforations no more than 10% downstream of the crosswise welds compared to a total length of the individual bag from top to bottom.
  • the total length of the individual bag from top to bottom is measured by separating/individualizing a bag from the web tubular film having both crosswise welds and crosswise perforations and measuring the length from top to bottom, i.e., the total length of the bag.
  • the perforator unit is configured to provide the crosswise perforations at a predetermined distance upstream from each crosswise weld.
  • the winding apparatus further comprises a breaker bar arrangement, wherein the breaker bar arrangement is arranged for cutting (breaking) the plurality of interconnected individual bags after the predetermined length of the plurality of interconnected individual bags have been wounded up by the winding shaft.
  • the distance from the perforator unit to the winding shaft is maximum 150 cm, such as maximum 100 cm, such as maximum 75 cm, such as maximum 50 cm, such as maximum 40, such as maximum 30 cm.
  • the distance between the perforator unit and the winding shaft is defined as the distance the plurality of interconnected individual bags needs to travel after having received the perforations to meeting the winding shaft. The distance may be measured by placing the measuring tool against the centre of the perforation unit as the starting point and measure to the centre of the winding shaft as the endpoint.
  • the distance from the perforator unit to the winding shaft is between 100 cm and 10 cm, such as between 20 cm and 90 cm, such as between 30 cm and 80 cm, or such as between 40 cm and 70 cm.
  • the winding apparatus further comprises a housing enclosing a workspace of the winding apparatus, wherein the workspace comprises at least the perforator unit and the winding shaft.
  • the workspace may further comprise the at least one spindle.
  • the winding apparatus further comprises a hot melt unit configured for applying a hot melt to a bottom side of the plurality of interconnected individual bags, wherein the bottom side of the plurality of interconnected individual bags is the side closest to the core after being wounded up by the winding shaft onto the core, and wherein the hot melt unit is located after the perforator unit but before the winding shaft. In one or more embodiments, the hot melt unit is located downstream the perforator unit but upstream the winding shaft.
  • a hot melt may hereby be applied from the bottom side just before winding the plurality of interconnected individual bags onto a new core.
  • the first contact point of the plurality of interconnected individual bags after being applied with hot melt is the core/roll.
  • the timing for the contact between core and hot melt may be synchronized with a breaker bar in order to prevent unforeseen wrap around at the core.
  • the breaker bar can make a conventional roll change that wraps the film around the core.
  • the first interconnected bag is hereby glued to the core, or alternatively to "itself". This step is today often done with double-adhesive tape.
  • the cores however can be recycled if the hot melt is not on the core itself.
  • the innermost bag of the interconnected bags glued to itself would go to waste anyway in the traditional method. Therefore, by gluing the first bag to "itself", the core may be recycled, as it would not comprise any residual glue once the first bag is removed. If the first interconnected bag is glued to the core, the step of adding double adhesive tape to the core is omitted.
  • a hot melt refers to a type of thermoplastic adhesive that is solid at room temperature but becomes liquid and adhesive when heated. It is commonly used in various industrial and commercial applications due to its quick-setting properties and strong bonding capabilities.
  • the hot melt adhesive is typically supplied in the form of solid pellets, sticks, or blocks, which are loaded into a hot melt glue gun or hot melt applicator.
  • the glue gun or applicator heats the adhesive, melting it into a liquid state, which can then be applied to the desired surface, in this case the bottom side of the film.
  • a core as used herein may also be called a roll, tube, or a spool.
  • the core is preferably a roll that is cylindrical.
  • the core may be a paper roll or a cardboard roll.
  • the core has a diameter of 10 mm to 1000 mm, such as 20 mm to 800 mm, or such as 20 mm to 600 mm.
  • the predetermined length of the web tubular film to be wound onto the core may further correspond to a predetermined amount/number of individual bags, based on the length of each bag.
  • the winding shaft is arranged to wind up a predetermined number of individual bags.
  • the winding apparatus further comprises a base frame.
  • the winding apparatus further comprises a feeding mechanism for supplying a continuous stream of web tubular film having crosswise welds to the perforator unit and the winding shaft.
  • the winding apparatus further comprises a tension control mechanism to regulate the tension of the film during winding.
  • the winding apparatus further comprises a control unit operatively connected to the feeding mechanism, tension control mechanism, and/or cutting arrangement, wherein the control unit is configured to automate and control the winding process.
  • the winding apparatus further comprises an unload position arranged for receiving the bottom-first bag roll.
  • the unload position comprises a label system arranged for close fix a roll tail of the bottom-first bag roll with a label, so that the bottom-first bag roll is prepared for automatic packaging.
  • a label system may be used to close fix the roll tail, so that the finished bag roll is prepared for automatic packaging.
  • the finished bag roll may automatically slide off the winding shaft and can be placed in a position that enable a robot to pick up the bag roll.
  • the winding apparatus further comprises an additional winding shaft. In one or more embodiments the winding apparatus comprises four winding shafts in total. By having more winding shafts the winding apparatus my be configured to run two streams of web tubular film and to have further winding shafts on one stream, the apparatus may be configured for a timeless shift between one core and the next core by shifting the film to wind on the second winding shaft in said stream.
  • a core is positioned on the winding shaft to receive the plurality of interconnected individual bags to be winded up.
  • the feed conveyor comprises a dancer unit.
  • a dancer unit is used to maintain tension in the moving web tubular film as it is being wound onto the winding shaft. It helps to prevent wrinkles, stretching, and other issues that can arise due to uneven tension.
  • the bottom-first bag roll producing machine further comprises a hot melt system, a welding machine, an edge guide, a punch unit, an extractor, a gusseting station, a folding unit, a reinforcement strip applicator, and/or an unwinder.
  • the process further comprising the step of cutting the plurality of interconnected individual bags after a predetermined length of the plurality of interconnected individual bags have been wounded up by the winding shaft.
  • the process further comprises a step of close fix a roll tail of the bottom-first bag roll with a label, so that the finished bottom-first bag roll is prepared for automatic packaging.
  • a core is positioned onto the winding shaft whereby the plurality of interconnected individual bags are winded up onto the core hereby producing the bottom-first bag roll.
  • the process further comprises a step of applying a hot melt to the bottom side of the plurality of interconnected individual bags, wherein the bottom side of the plurality of interconnected individual bags is the side closest to the core after being wounded up by the winding shaft onto the core.
  • the process further comprises one or more of the steps of:
  • a web tubular film having crosswise welds 109 enters into the winding apparatus 101 via a feed conveyer 121.
  • This feed conveyer may comprise a dancer unit 123 e.g., an in-line dancer, which can control the tension of the web tubular film and further is able to act as an accumulator to take up length variations of the web tubular film between the dancer and winding apparatus.
  • a dancer unit 123 e.g., an in-line dancer, which can control the tension of the web tubular film and further is able to act as an accumulator to take up length variations of the web tubular film between the dancer and winding apparatus.
  • an edge guide in order to align the web tubular film so that the edge is straight before entering the winding apparatus.
  • a sensor may detect the crosswise welds in the web tubular film.
  • the crosswise welds may be made to the web tubular film in a welding machine before the web tubular film enters the winding apparatus 101 or the dancer 123.
  • the signal from the sensor activates the perforator unit 105, so that a crosswise perforation is made in each section of the web tubular film such that a plurality of interconnected individual bags is created, wherein the plurality of interconnected individual bags are interconnected along transverse lines of weakness created by the crosswise perforationsperforation.
  • the crosswise perforations are provided to the web tubular film having crosswise welds 109 such that each of the plurality of interconnected individual bags are defined as a section between a downstream crosswise perforation and the next upstream crosswise perforation, wherein the downstream crosswise perforation defines a top and opening of each of the plurality of interconnected individual bags when the plurality of interconnected individual bags are individualized by breaking the transverse lines of weakness. Hence, the opening of the next bag is in the front end of the bag.
  • the perforator unit 105 may be located at the inlet section 111 of the winding apparatus 101, which means a very short distance to the winding point. Due to the short distance between the perforator unit 105 and to the winding point (the winding shaft 107) it can be avoided or minimized that air enters and being trapped in the bag.
  • a hot melt unit 119 configured for applying a hot melt to a bottom side of the plurality of interconnected individual bags is added to the winding unit 101.
  • the hot melt unit is located after the perforator unit 105 but before the winding shaft 107.
  • a hot melt may be applied from the bottom side just before winding the film and the first contact point of the web tubular film after being applied with hot melt may in one embodiment be a core e.g., a paper or plastic core/roll.
  • the timing for the contact between core and hot melt may be synchronized with a breaker bar 113 in order to prevent unforeseen wrap around at the core.
  • the hot melt can be added at a longer distance from the perforation. In this way the hot melt will be added between first layer of the web tubular film and the second layer of the web tubular film. This makes it possible to fix the web tubular film to the core without contaminating the core, which means that the core can be reused when the finished bag roll is unwinded.
  • a breaker bar 113 (may be called a cutter arrangement if perforations are not present), arranged for cutting the plurality of interconnected individual bags after the predetermined length of the plurality of interconnected individual bags have been wounded up by the winding shaft 107.
  • a turret 125 of the winding apparatus 101 may move the bottom-first bag rolls (the finished roll) to the unload position (not shown in the figures) arranged for receiving the bottom-first bag roll (may also be called the exit position) and make a roll change.
  • the roll change may happen by the turret 125 delivering the bottom-first bag rolls to the unload position e.g., a tray and where the bottom-first bag rolls afterwards is moved sideways out of the unload position.
  • the finished roll may automatically slide off the winding shaft. Grippers may then apply a new roll/core from a magazine to the winding shaft 107.
  • a label system (not shown) may be used to close fix the roll tail, so that the finished bag roll is prepared for automatic packaging.

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EP23194157.6A 2023-08-30 2023-08-30 Wickelvorrichtung zur herstellung von bottom-first-beutelrollen Pending EP4516709A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP23194157.6A EP4516709A1 (de) 2023-08-30 2023-08-30 Wickelvorrichtung zur herstellung von bottom-first-beutelrollen

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP23194157.6A EP4516709A1 (de) 2023-08-30 2023-08-30 Wickelvorrichtung zur herstellung von bottom-first-beutelrollen

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EP4516709A1 true EP4516709A1 (de) 2025-03-05

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050259892A1 (en) * 2004-05-20 2005-11-24 Tan Gregorio L Pre-cut plastic bag roll, method and apparatus for making same

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050259892A1 (en) * 2004-05-20 2005-11-24 Tan Gregorio L Pre-cut plastic bag roll, method and apparatus for making same

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