WO2018073224A1 - Apparatus and method for producing bags from plastic material - Google Patents

Apparatus and method for producing bags from plastic material Download PDF

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Publication number
WO2018073224A1
WO2018073224A1 PCT/EP2017/076439 EP2017076439W WO2018073224A1 WO 2018073224 A1 WO2018073224 A1 WO 2018073224A1 EP 2017076439 W EP2017076439 W EP 2017076439W WO 2018073224 A1 WO2018073224 A1 WO 2018073224A1
Authority
WO
WIPO (PCT)
Prior art keywords
air flow
hot air
valve
cold air
cover sheet
Prior art date
Application number
PCT/EP2017/076439
Other languages
German (de)
French (fr)
Inventor
Andreas Lamkemeyer
Original Assignee
Windmöller & Hölscher Kg
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 Windmöller & Hölscher Kg filed Critical Windmöller & Hölscher Kg
Priority to ATGM9009/2017U priority Critical patent/AT16643U1/en
Publication of WO2018073224A1 publication Critical patent/WO2018073224A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/10—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using hot gases (e.g. combustion gases) or flames coming in contact with at least one of the parts to be joined
    • B29C65/103—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using hot gases (e.g. combustion gases) or flames coming in contact with at least one of the parts to be joined direct heating both surfaces to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/78—Means for handling the parts to be joined, e.g. for making containers or hollow articles, e.g. means for handling sheets, plates, web-like materials, tubular articles, hollow articles or elements to be joined therewith; Means for discharging the joined articles from the joining apparatus
    • B29C65/7841—Holding or clamping means for handling purposes
    • B29C65/7847—Holding or clamping means for handling purposes using vacuum to hold at least one of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • B29C66/431—Joining the articles to themselves
    • B29C66/4312—Joining the articles to themselves for making flat seams in tubular or hollow articles, e.g. transversal seams
    • B29C66/43121—Closing the ends of tubular or hollow single articles, e.g. closing the ends of bags
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/47—Joining single elements to sheets, plates or other substantially flat surfaces
    • B29C66/472—Joining single elements to sheets, plates or other substantially flat surfaces said single elements being substantially flat
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
    • B29C66/73921—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/834—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools moving with the parts to be joined
    • B29C66/8341—Roller, cylinder or drum types; Band or belt types; Ball types
    • B29C66/83411—Roller, cylinder or drum types
    • B29C66/83413—Roller, cylinder or drum types cooperating rollers, cylinders or drums
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/834—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools moving with the parts to be joined
    • B29C66/8341—Roller, cylinder or drum types; Band or belt types; Ball types
    • B29C66/83411—Roller, cylinder or drum types
    • B29C66/83417—Roller, cylinder or drum types said rollers, cylinders or drums being hollow
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/84—Specific machine types or machines suitable for specific applications
    • B29C66/851—Bag or container making machines
    • B29C66/8511—Bag making machines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9141—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature
    • 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
    • B31B70/006—Controlling; Regulating; Measuring; Safety measures
    • 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
    • B31B70/60—Uniting opposed surfaces or edges; Taping
    • B31B70/64—Uniting opposed surfaces or edges; Taping by applying heat or pressure
    • B31B70/644—Making seals parallel to the direction of movement, i.e. longitudinal sealing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2793/00—Shaping techniques involving a cutting or machining operation
    • B29C2793/0081—Shaping techniques involving a cutting or machining operation before shaping
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
    • B29C66/729—Textile or other fibrous material made from plastics
    • B29C66/7292—Textile or other fibrous material made from plastics coated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
    • B29C66/729—Textile or other fibrous material made from plastics
    • B29C66/7294—Non woven mats, e.g. felt
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
    • B29C66/729—Textile or other fibrous material made from plastics
    • B29C66/7294—Non woven mats, e.g. felt
    • B29C66/72941—Non woven mats, e.g. felt coated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/737—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined
    • B29C66/7371—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined oriented or heat-shrinkable
    • B29C66/73711—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined oriented or heat-shrinkable oriented
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/818—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps
    • B29C66/8181—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the cooling constructional aspects
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/919—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux characterised by specific temperature, heat or thermal flux values or ranges
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/94—Measuring or controlling the joining process by measuring or controlling the time
    • B29C66/949—Measuring or controlling the joining process by measuring or controlling the time characterised by specific time values or ranges
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/712—Containers; Packaging elements or accessories, Packages
    • B29L2031/7128—Bags, sacks, sachets
    • B29L2031/7129—Bags, sacks, sachets open
    • 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
    • B31B2150/00—Flexible containers made from sheets or blanks, e.g. from flattened tubes
    • B31B2150/001—Flexible containers made from sheets or blanks, e.g. from flattened tubes with square or cross bottom
    • B31B2150/0014—Flexible containers made from sheets or blanks, e.g. from flattened tubes with square or cross bottom having their openings facing transversally to the direction of movement
    • 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
    • B31B2150/00—Flexible containers made from sheets or blanks, e.g. from flattened tubes
    • B31B2150/002—Flexible containers made from sheets or blanks, e.g. from flattened tubes by joining superimposed sheets, e.g. with separate bottom sheets
    • 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
    • B31B2150/00—Flexible containers made from sheets or blanks, e.g. from flattened tubes
    • B31B2150/20—Flexible containers made from sheets or blanks, e.g. from flattened tubes the longitudinal axes of the containers being perpendicular to the direction in which the sheets or blanks are fed
    • 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
    • B31B2160/00—Shape of flexible containers
    • B31B2160/20—Shape of flexible containers with structural provision for thickness of contents

Definitions

  • the invention relates to a device for producing sacks of plastic material according to the preamble of claim 1 and to a method 5 according to the preamble of claim 5.
  • hot air sealers are used to seal cover sheets and / or valve sheets onto the preformed plastic material hose portion.
  • the parameters air pressure and air temperature necessary for the process are set and the machine is started. These parameters often remain unchanged during operation of the devices once they have been adjusted. In particular, these settings often remain independent of the machine speed or the sealing area in the bag section.
  • the object of the present invention is therefore to provide an apparatus and a method in which a reliable sealing of cover sheets and / or valve leaflets on hose sections is possible even at varying machine speeds, but without damaging them.
  • the present invention is based on a device according to the preamble of claim 1 characterized by at least one device for supplying a cold air flow in the area between the preformed tube section and a cover sheet and / or a valve sheet or for supplying a cold air flow into the device for introducing the hot air flow in the area between a preformed tube section and a cover sheet and / or a valve sheet.
  • a stream of cold air is mixed with the hot air stream, whereby in particular the temperature of the hot air stream is herabsetzbar.
  • This is done either with an additional device directly into the sealing area, which is given by the area between the preformed tube section and the cover sheet and / or the valve sheet, can be introduced, or is introduced into a component of the device for introducing the hot air flow.
  • the difference between these two variants is that in the first case the hot air and the cold air mix in the sealing area, while in the second case the hot air and the cold air within the means for introducing the hot air flow mix and are introduced into the sealing area as an air mixture becomes.
  • the advantage of the second variant is that within the sealing region locally greatly different temperatures are avoided.
  • cold air or “cold air” is air having a temperature in the range from -100 degrees to 100 degrees C.
  • Air or “cold air” is to be regarded as a synonym for any gas or gas mixture »Especially below Hot air can also be any gas mixture, in particular ambient air.
  • the plastic material which can be processed with devices and methods according to the invention is preferably a coated fabric, wherein the fabric has been produced from stretched plastic tapes.
  • the base material for the fabric and / or for the coating is a polyolefinic material, in particular polypropylene and / or polyethylene.
  • polypropylene fabric and the polyethylene coating it is advantageous to provide the polypropylene fabric and the polyethylene coating.
  • the plastic material may comprise a nonwoven, a coated nonwoven or a plastic film.
  • a plastic film may be multi-layered and include polyethylene, for example.
  • a fast-switching air valve is provided in all variants of the invention, where "fast-switching" means a valve reaction time of less than 100 milliseconds (ms), preferably less than 50 ms and in particular less than 20 ms It makes it possible to switch sufficiently fast to colder air with a throughput time through the sealing range of more than 1000 ms per sack in the start-up and set-up mode, in order to avoid burning of the plastic material due to excessive heat input, but also in normal operation, in which the throughput time in the Sealing range is 500ms or less, the use of the quick-acting valve can pinpointly add cold air, thus making it possible to raise the temperature of the hot air even more to allow a shorter throughput speed Reuz convinceds possible, however, folding edges of the bottom rectangle can be damaged, which can lead to so-called edge breakage.
  • fast-switching means a valve reaction time of less than 100 milliseconds (ms), preferably less than 50 ms and in particular less than 20 ms
  • the hot air flow with fixed parameters in particular fixed set temperature and / or a fixed air pressure, berett basic, in which the cold air flow is inflated.
  • the necessary or desired temperature variations in the sealing area are then carried out by supplying a suitable amount of cold air.
  • a supply line for supplying cold air is preferably provided in the means for introducing the hot air flow between a heating device and the outlet nozzle of the device to allow a short path of the mixed air into the sealing region.
  • the device for introducing this hot air flow is part of a device for generating a hot air flow and comprises a heating element to arrange the cold air supply in the flow direction of the hot air flow in front of the heater.
  • the heater it is advantageous to operate the heater with constant power, since a change in power of the heater is very sluggish, With a cold air supply at this point then the air that is supplied to the heater, a lower base temperature compared with the air without cold air supply, so that the final temperature after passing through the heater is lower
  • the advantage of such an arrangement is the saving of space in the vicinity of the Siegei Schemes, which is thus better accessible.
  • a compressed air source is connected upstream.
  • a compressed air source in particular has a pressure-increasing effect and can be designed as a pump or blower. This makes it possible to supply cold air with a pressure and / or a volume flow, which is higher than that of the ambient air, to the sealing area. In particular, a sufficiently fast, in particular sudden cooling of the Air temperature in the sealed area is reached to lower the overall temperature in the Siegei Silver.
  • the compressed air source can additionally be operated in conjunction with a tempering device in order to be able to change the temperature of the cold air in addition to the pressure or volume flow.
  • This tempering device can be designed as a heater, in particular as a resistance heater, and / or as a cooling device.
  • a hot air flow is provided with a hot-air generator
  • FIG. 1 side view of a first variant of an inventive
  • FIG. 2 side view of a second variant of an inventive
  • FIG. 3 side view of a third variant of an inventive
  • FIG. 4 side view of a fourth variant of an inventive
  • FIG. 5 showing essential steps for Hersannon a valve bag from a piece of hose
  • a device according to the invention can be based on the device disclosed in DE 195 02 255 C2, FIG.
  • workstations are provided. Specifically, these are: a work station for applying valve leaflets, work stations for closing the floors, and work stations for applying ground cover sheets which hold together the floors of the bags.
  • workstations for applying the bottom cover sheets may possibly be dispensed with. Other workstations are conceivable.
  • the workstations are made double, so that the corresponding work can be performed simultaneously at both ends of the tubing pieces, which are usually conveyed transversely to their longitudinal axis hose, the number of workstations for introducing the valve leaves or hoses may differ from this rule, depending on the desired number of valves.
  • FIG. 1 now shows the side view of such a workstation 1 in a device according to the invention, which is a workstation for applying bottom cover sheets 3, 3 'to sacks 2.
  • the transversely conveyed bags 2 lie on a table 4 and are transported by a suitable, not shown in this figure transport in the transport direction z.
  • the already added floors are also placed in the plane of the table.
  • the invention is not limited to this, but the floors can also lie in a plane which is orthogonal to the plane which is spanned by the table level,
  • a web material 6 is supplied, from which the bottom cover sheets 3, 3 'are separated.
  • the leading end of the web material 6 is detected by the cutting cylinder 7 and the conveyor belt 8 and pulled forward and from the cutting cylinder in the 7th integrated, but not shown in detail cutting device 9 cut transversely.
  • the resulting bottom cover sheet 3, 3 ' is taken over by the suction cylinder 10 and placed on the bottom of the bag 2.
  • the suction cylinder 10 forms with the impression cylinder 11 a nip 12. In this way, the bottom cover sheet 3 'is pressed onto the bag 2 with high force.
  • a part of the bag 2 has already been performed with resting ground cover sheet 3 'through the nip.
  • the hot air stream 18 is passed into the inlet side of the nip 12.
  • the hot air causes a melting of the coating both on the bottom of the bag 2 'and on the bottom cover sheet 3'.
  • the coatings of the surfaces are melted or plasticized, which are brought together immediately afterwards.
  • the bringing together of the surfaces with the still fused coating material takes place in the nip 12, so that the coatings now form an intermediate layer, which can be regarded as homogeneous, between ground cover sheet and ground, which permanently connects said components after cooling.
  • the inlet area of the nip can be referred to as a sealing area.
  • the cylinders 10 and 11 rotate in the direction of the arrows R and R ".
  • the device for generating a hot air flow 13 initially comprises, as a central element, a hot air blower 20, which comprises a blower with integrated or downstream heating means.
  • an optional rotary valve 22 is provided, with which the hot air flow can be interrupted.
  • the hot air flow when it is not needed (ie in the periods in which no bag is the sealing area), deflected and released to the environment.
  • the rotary valve 22 may be spaced from the hot air blower 20 by means of a pipe section 23.
  • the hot air stream now passes into a nozzle 24, which spreads this hot air stream preferably to the width of the bottom of the bag 2 while focused him targeted to the inlet region of the nip 12.
  • an opening can be provided in the nozzle 24, into which a pipe 25 supplying the cold air or hose can open.
  • This tube 25 or this tube may comprise a fast-switching valve 26, with which a cold air flow can be interrupted or passed on.
  • a pump or a blower 27 which is provided to put the cold air under a sufficiently high pressure, so that after opening the fast-switching valve also directly the cold air flow reaches the inlet region of the nip 12, where it reduces by mixing the temperature of the hot air flow.
  • a tempering with which the temperature of the cold air flow can be influenced
  • FIG. 3 now shows a variant of FIG. 1 in which the tube or tube 25 does not terminate in the region of the nozzle 24, but is provided with its own nozzle 28. With this nozzle 28, the cold air flow can be introduced directly into the Siegei Bachelor. This arrangement has the advantage that it can be retrofitted to existing mashines.
  • FIG. 4 now shows a further embodiment variant of the device according to the invention, in which the hose or the pipe 25 opens into the line 21 and thus supplies a stream of cold air in order to be able to cool the supplied air stream from the environment.
  • FIG. 5 illustrates the steps for molding floors onto the later sack 2, which initially exists as a piece of hose 40, the ski piece being transferable by means of the transport device 41 to the individual stations with which the steps for molding floors on hose pieces can be carried out is.
  • at least one end, preferably both ends, of the piece of tubing is raised, the top layer being folded back along the bottom center line 42, so that the bottom rectangle 43 and the triangular pockets 44 are formed.
  • the second folded edges 45 are drawn with dotted lines around which the side flaps 46, 47, with which the areas are designated beyond the second folding edges, are folded.
  • step c) and d The side flaps 46 and 47 are folded around these second folded edges in step c) and d), which is preferably slightly offset in time so as not to cause a disturbance. It is now an added ground 48 arose.
  • step b) a so-called valve sheet 49 was previously attached to a triangular pocket, which later provides an opening for filling the finished bag.
  • step e) a cover sheet 50 is then fastened on the bottom of the bag in such a way that both side flaps are connected to one another and to the triangular pockets adjoining on both sides.
  • the second optional tray 51 has been produced in the same way and preferably simultaneously, but without the introduction of a valve.

Abstract

The invention relates to an apparatus and a method for producing bags from plastic material with a hot air unit for providing a hot air flow, a device (29, 30) for introducing this hot air flow into the region between a preformed sleeve section (2) and a cover sheet (50) and/or a valve patch (49), wherein the sleeve section (2) and the cover sheet (50) and/or the valve patch (49) can be conveyed and positioned on top of one another by means of conveyor devices. Also included is a device for supplying a cold air flow into the region between the preformed sleeve section (2) and a cover sheet (50) and/or a valve patch (49), or for supplying a cold air flow into the device for introducing the hot air flow into the region between a preformed sleeve section (2) and a cover sheet (50) and/or a valve patch (49).

Description

Vorrichtung und Verfahren zur Herstellung von Säcken aus Kunststoffmaterial0  Apparatus and method for making plastic bags0
Die Erfindung betrifft eine Vorrichtung zur Herstellung von Säcken aus Kunststoffmaterial nach dem Oberbegriff des Anspruchs 1 sowie ein Verfahren 5 nach dem Oberbegriff des Anspruchs 5. The invention relates to a device for producing sacks of plastic material according to the preamble of claim 1 and to a method 5 according to the preamble of claim 5.
In den genannten Vorrichtungen und bei den genannten Verfahren werden Heißluftsiegeleinrichtungen verwendet, um Deckblätter und/oder Ventilzettel auf den vorgeformten Schlauchabschnitt aus Kunststoffmaterial zu siegeln. Dazu werden die für den Prozess notwendigen Parameter Luftdruck und Lufttemperatur eingestellt und die Maschine gestartet. Diese Parameter bleiben während des Betriebs der Vorrichtungen oft unverändert, wenn sie einmal eingestellt worden sind. Insbesondere bleiben diese Einstellungen oft unabhängig von der Maschinengeschwindigkeit oder des Siegelbereiches im Sackabschnitt erhalten. In the aforesaid apparatuses and methods hot air sealers are used to seal cover sheets and / or valve sheets onto the preformed plastic material hose portion. For this purpose, the parameters air pressure and air temperature necessary for the process are set and the machine is started. These parameters often remain unchanged during operation of the devices once they have been adjusted. In particular, these settings often remain independent of the machine speed or the sealing area in the bag section.
Bei immer höher werdenden Maschinengeschwindigkeiten ist es jedoch problematisch, sowohl für niedrige und für hohe Geschwindigkeiten eine gleiche Einstellung der Prozessparameter (Luftdruck und Temperatur) zu finden, welche Deckblätter und/oder Ventilzettel auf den vorgeformten Schlauchabschnitt aus Kunststoffmaterial siegeln, aber diese nicht verbrennen. Es ist aber oft nicht möglich ist, den Luftdruck und/oder die Lufttemperatur entsprechend der Beschleunigungsrampe schnell genug zu verändern. Insbesondere bei einer Verlangsamung der Maschine kann die Lufttemperatur oft nicht schnell genug verringert werden. Die Aufgabe der vorliegenden Erfindung ist es daher, eine Vorrichtung und ein Verfahren zu schaffen, bei denen auch bei variierenden Maschinengeschwindigkeiten ein zuverlässiges Siegeln von Deckblättern und/oder Ventilzetteln auf Schlauchabschnitte möglich ist, ohne diese jedoch zu beschädigen. However, with ever-increasing machine speeds, it is problematic to find an equal setting of process parameters (air pressure and temperature) for both low and high speeds, which seal topsheets and / or valve leaflets onto the preformed plastic material tube section but do not burn them. However, it is often not possible to change the air pressure and / or the air temperature quickly enough in accordance with the acceleration ramp. In particular, with a slowdown of the machine, the air temperature often can not be reduced fast enough. The object of the present invention is therefore to provide an apparatus and a method in which a reliable sealing of cover sheets and / or valve leaflets on hose sections is possible even at varying machine speeds, but without damaging them.
Die Aufgabe wird gelöst durch die Merkmale des Anspruchs 1. Vorteilhafte Ausgestaltungen sind in den abhängigen Ansprüchen angegeben. Die vorliegende Erfindung ist ausgehend von einer Vorrichtung gemäß dem Oberbegriff des Anspruchs 1 gekennzeichnet durch wenigstens eine Einrichtung zum Zuführen eines Kaltluftstroms in den Bereich zwischen dem vorgeformten Schlauchabschnitt und einem Deckblatt und/oder einem Ventilzettel oder zum Zuführen eines Kaltluftstroms in die Einrichtung zum Einleiten des Heißluftstroms in den Bereich zwischen einem vorgeformten Schlauchabschnitt und einem Deckblatt und/oder einem Ventilzettel. The object is solved by the features of claim 1. Advantageous embodiments are specified in the dependent claims. The present invention is based on a device according to the preamble of claim 1 characterized by at least one device for supplying a cold air flow in the area between the preformed tube section and a cover sheet and / or a valve sheet or for supplying a cold air flow into the device for introducing the hot air flow in the area between a preformed tube section and a cover sheet and / or a valve sheet.
Mit anderen Worten ist vorgesehen, dass ein Strom kalter Luft mit dem Heißluftstrom vermischt wird, wodurch insbesondere die Temperatur des Heißluftstroms herabsetzbar ist. Dies erfolgt entweder mit einer zusätzlichen Einrichtung direkt in den Siegelbereich, der durch den Bereich zwischen dem vorgeformten Schlauchabschnitt und dem Deckblatt und/oder dem Ventilzettel gegeben ist, einbringbar ist, oder in ein Bauteil der Einrichtung zum Einleiten des Heißluftstroms eingebracht wird. Der Unterschied dieser beiden Varianten ist» dass im ersten Fall die heiße Luft und die kalte Luft sich im Siegelbereich vermischen, während im zweiten Fall sich die heiße Luft und die kalte Luft innerhalb der Einrichtung zum Einleiten des Heißluftstroms vermischen und als Luftgemisch in den Siegelbereich eingebracht wird. Während sich die erste Variante durch einen einfachen Aufbau auszeichnet, ist der Vorteil der zweiten Variante, dass innerhalb des Siegelbereiches lokal stark unterschiedliche Temperaturen vermieden werden. Unter„Kaltluft" bzw.„kalter Luft" ist dabei Luft mit einer Temperatur im Bereich von -100 Grad bis 100 Grad Celsius.„Luft" bzw.„Kaltluff ist dabei als Synonym für ein beliebiges Gas oder Gasgemisch anzusehen. Bevorzugt ist jedoch Umgebungsluft» die insbesondere unterhalb der Raumtemperatur abgekühlt worden ist Auch Heißluft kann ein beliebiges Gasgemisch sein, insbesondere Umgebungsluft. In other words, it is provided that a stream of cold air is mixed with the hot air stream, whereby in particular the temperature of the hot air stream is herabsetzbar. This is done either with an additional device directly into the sealing area, which is given by the area between the preformed tube section and the cover sheet and / or the valve sheet, can be introduced, or is introduced into a component of the device for introducing the hot air flow. The difference between these two variants is that in the first case the hot air and the cold air mix in the sealing area, while in the second case the hot air and the cold air within the means for introducing the hot air flow mix and are introduced into the sealing area as an air mixture becomes. While the first variant is characterized by a simple structure, the advantage of the second variant is that within the sealing region locally greatly different temperatures are avoided. In this context, "cold air" or "cold air" is air having a temperature in the range from -100 degrees to 100 degrees C. "Air" or "cold air" is to be regarded as a synonym for any gas or gas mixture »Especially below Hot air can also be any gas mixture, in particular ambient air.
Das Kunststoffmaterial, das mit erfindungsgemäßen Vorrichtungen und Verfahren bearbeitbar ist, ist vorzugsweise ein beschichtetes Gewebe, wobei das Gewebe aus gereckten Kunststoffbändchen erzeugt worden ist. Das Grundmaterial für das Gewebe und/oder für die Beschichtung ist ein polyolefinisches Material, insbesondere Polypropylen und/oder Polyethylen. Insbesondere ist es vorteilhaft, das Gewebe aus Polypropylen und die Beschichtung aus Polyethylen vorzusehen. Gleichwohl kann das Kunststoffmaterial ein Vlies, ein beschichtetes Vlies oder einen Kunststofffilm umfassen. Ein Kunststofffilm kann dabei mehrschichtig sein und beispielsweise Polyethylen umfassen. In einer vorteilhaften Ausgestaltung der Erfindung ist in allen Erfindungsvarianten ein schnellschaltendes Luftventils vorgesehen, wobei unter „schnellschaltend" eine Reaktionszeit des Ventils von weniger als 100 Millisekunden (ms), vorzugsweise weniger als 50ms und insbesondere weniger als 20ms zu verstehen ist. In diesem Fall ist es möglich, bei einer Durchlaufzeit durch den Siegelbereich von mehr als 1000ms pro Sack im Anfahr- und Einrichtmodus ausreichend schnell auf kältere Luft umzuschalten, um ein Verbrennen des Kunststoffmaterials durch zu großen Wärmeeintrag zu vermeiden. Aber auch im Normalbetrieb, in dem die Durchlaufzeit in dem Siegelbereich 500ms oder weniger beträgt, kann durch die Verwendung des schnellschaltenden Ventils punktgenau Kaltluft beigefugt werden. So kann es dadurch ermöglichst sein, die Temperatur der Heißluft nochmals zu erhöhen, um eine kürzere Durchlaufgeschwindigkeit zu ermöglichen. Eine höhere Temperatur ist für die Dreieckstaschen eines Kreuzbodens möglich, jedoch können Falzkanten des Bodenrechtecks geschädigt werden, was zum so genannten Kantenbruch führen kann. Durch das Eintragen von Kaltluft im Bereich des Bodenrechtecks kann diese Gefahr reduziert werden. in einerweiteren vorteilhaften Weiterbildung der Erfindung ist vorgesehen, dass der Heißluftstrom mit fest eingestellten Parametern, insbesondere mit fest eingestellter Temperatur und/oder einem fest eingestellten Luftdruck, berettstellbar ist, in welchen der Kaltluftstrom einblasbar ist. Damit ist es möglich, den Heißluftstrom mit konstanten Verhältnissen bereitzustellen, um eine Parametervariation zu vermeiden, die, wie eingangs geschildert wurde, sehr träge ist. Die notwendigen oder gewünschten Temperaturvariationen im Siegelbereich werden dann durch die Zuführung einer passenden Menge an Kaltluft durchgeführt. Eine Zuführleitung zum Zuführen von Kaltluft ist vorzugsweise in der Einrichtung zum Einleiten des Heißluftstroms zwischen einer Heizvonichtung und der Austrittsdüse der Einrichtung vorgesehen, um einen kurzen Weg der vermischten Luft in den Siegelbereich zu ermöglichen. Alternativ ist es jedoch auch denkbar, wenn, unter der Voraussetzung, dass die Einrichtung zum Einleiten dieses Heißluftstroms Bestandteil einer Einrichtung zum Erzeugen eines Heißluftstroms ist und eine Heizelement umfasst, die Kaltluftzufuhr in Stromrichtung des Heißluftstroms vor der Heizung anzuordnen. In diesem Fall ist es vorteilhaft, die Heizung mit konstanter Leistung zu betreiben, da eine Leistungsänderung der Heizung nur sehr träge abläuft, Bei einer Kaltluftzufuhr an dieser Stelle hat dann die Luft, die der Heizung zugeführt wird, eine niedrigere Grundtemperatur im Vergleich mit der Luft ohne Kaltluftzufuhr, so dass auch die Endtemperatur nach dem Passieren der Heizung niedriger ist Der Vorteil einer solchen Anordnung ist das Einsparen vor Bauraum in der Nähe des Siegeibereichs, welcher damit besser erreichbar ist. Dies ist im Fall von unvorhergesehenen Problemen vorteilhaft, da der Siegelbereich dann händisch erreichbar ist. Ebenfalls ist es denkbar, den Drehschieber durch solch ein System zu ersetzen. Im Falle der „Auspuffstellung" wird genügend Kaltluft eingeblasen, um ein Siegeln sicher zu verhindern. Diese Ausführungsform wird weiter unten genauer erläutert. The plastic material which can be processed with devices and methods according to the invention is preferably a coated fabric, wherein the fabric has been produced from stretched plastic tapes. The base material for the fabric and / or for the coating is a polyolefinic material, in particular polypropylene and / or polyethylene. In particular, it is advantageous to provide the polypropylene fabric and the polyethylene coating. However, the plastic material may comprise a nonwoven, a coated nonwoven or a plastic film. A plastic film may be multi-layered and include polyethylene, for example. In an advantageous embodiment of the invention, a fast-switching air valve is provided in all variants of the invention, where "fast-switching" means a valve reaction time of less than 100 milliseconds (ms), preferably less than 50 ms and in particular less than 20 ms It makes it possible to switch sufficiently fast to colder air with a throughput time through the sealing range of more than 1000 ms per sack in the start-up and set-up mode, in order to avoid burning of the plastic material due to excessive heat input, but also in normal operation, in which the throughput time in the Sealing range is 500ms or less, the use of the quick-acting valve can pinpointly add cold air, thus making it possible to raise the temperature of the hot air even more to allow a shorter throughput speed Reuzbodens possible, however, folding edges of the bottom rectangle can be damaged, which can lead to so-called edge breakage. By introducing cold air in the area of the ground rectangle, this danger can be reduced. In a further advantageous embodiment of the invention, it is provided that the hot air flow with fixed parameters, in particular fixed set temperature and / or a fixed air pressure, berettstellbar, in which the cold air flow is inflated. This makes it possible to provide the hot air flow with constant ratios in order to avoid a parameter variation, which, as described above, is very sluggish. The necessary or desired temperature variations in the sealing area are then carried out by supplying a suitable amount of cold air. A supply line for supplying cold air is preferably provided in the means for introducing the hot air flow between a heating device and the outlet nozzle of the device to allow a short path of the mixed air into the sealing region. Alternatively, however, it is also conceivable, if, provided that the device for introducing this hot air flow is part of a device for generating a hot air flow and comprises a heating element to arrange the cold air supply in the flow direction of the hot air flow in front of the heater. In this case, it is advantageous to operate the heater with constant power, since a change in power of the heater is very sluggish, With a cold air supply at this point then the air that is supplied to the heater, a lower base temperature compared with the air without cold air supply, so that the final temperature after passing through the heater is lower The advantage of such an arrangement is the saving of space in the vicinity of the Siegeibereichs, which is thus better accessible. This is advantageous in the case of unforeseen problems, since the seal area is then manually reachable. It is also conceivable to replace the rotary valve with such a system. In the case of the "exhaust position", enough cold air is blown in to prevent sealing, which will be explained in more detail below.
In weiterer Ausgestaltung der Erfindung ist es vorgesehen, dass der Einrichtung zum Zuführen eines Kaltluftstroms eine Druckluftquelle vorgeschaltet ist. Eine solche Druckluftquelle hat dabei insbesondere eine druckerhöhende Wirkung und kann als Pumpe oder Gebläse ausgestaltet sein. Damit ist es möglich, kalte Luft mit einem Druck und/oder einem Volumenstrom, welcher höher ist als derjenige der Umgebungsluft, dem Siegelbereich zuzuführen. Insbesondere wird dabei ein hinreichend schnelles, insbesondere schlagartiges Abkühlen der Lufttemperatur im Siegelbereich erreicht, um die Gesamttemperatur im Siegeibereich herabzusetzen. Die Druckluftquelle kann zusätzlich im Zusammenhang mit einer Temperiereinrichtung betrieben werden, um zusätzlich zum Druck bzw. Volumenstrom auch die Temperatur der Kaltluft verändern zu können. Diese Temperiereinrichtung kann als Heizung, insbesondere als Widerstandsheizung, und/oder als Kühleinrichtung ausgestaltet sein. In a further embodiment of the invention, it is provided that the device for supplying a cold air flow, a compressed air source is connected upstream. Such a compressed air source in particular has a pressure-increasing effect and can be designed as a pump or blower. This makes it possible to supply cold air with a pressure and / or a volume flow, which is higher than that of the ambient air, to the sealing area. In particular, a sufficiently fast, in particular sudden cooling of the Air temperature in the sealed area is reached to lower the overall temperature in the Siegeibereich. The compressed air source can additionally be operated in conjunction with a tempering device in order to be able to change the temperature of the cold air in addition to the pressure or volume flow. This tempering device can be designed as a heater, in particular as a resistance heater, and / or as a cooling device.
Mit der Erfindung ist es auch möglich, während der Siegelung eines einzelnen Sackabschnitts unterschiedliche Siegeltemperaturen nutzbar zu machen, was auch bei der maximalen Maschinengeschwindigkeit denkbar ist. Soll es im Mittelteil des Sackes nicht zu Kantenbruch kommen, kann vorgesehen sein, mit entsprechender Einstellung des Luftventils (Puls-Weiten-Modulation) genügend Kaltluft einzublasen, um in diesem Zeitraum die Lufttemperatur abzusenken. Zu den Enden kann das Einblasen von Kaltluft reduziert werden, um wieder mit hoher Temperatur zu arbeiten, beispielsweise um die Dreieckstaschen zu versiegeln. With the invention it is also possible to make use of different sealing temperatures during the sealing of a single bag section, which is also conceivable at the maximum machine speed. If it does not come to edge break in the middle part of the bag, can be provided with appropriate adjustment of the air valve (pulse-width modulation) enough cold air to blow in order to lower the air temperature in this period. To the ends, cold air injection can be reduced to re-operate at high temperature, for example to seal the triangular pockets.
Die oben angeführte Aufgabe wird auch gelöst durch ein Verfahren nach dem Oberbegriff des Anspruchs 5, welchem die Schritte des Kennzeichens desselben Anspruchs hinzugefügt werden. Demnach ist bei einem Verfahren zur Herstellung von Säcken aus Kunststoffmaterial, bei dem The above object is also achieved by a method according to the preamble of claim 5, to which the steps of the characterizing portion of the same claim are added. Accordingly, in a method for producing bags of plastic material, wherein
• mit einem Heißluftaggregat ein Heißluftstrom bereitgestellt wird,  A hot air flow is provided with a hot-air generator,
• mit einer Einrichtung zum Einleiten des Heißluftstroms dieser in den Bereich zwischen einem vorgeformten Schlauchabschnitt und einem Deckblatt und/oder einem Ventilzettel eingeleitet wird, wobei der Schlauchabschnitt und das Deckblatt und/oder der Ventilzettel mittels Fördereinrichtungen gefördert- und aufeinander abgelegt werden,  • is introduced with a device for introducing the stream of hot air into the region between a preformed tube section and a cover sheet and / or a valve sheet, the tube section and the cover sheet and / or the valve sheet being conveyed and deposited on one another by means of conveying devices,
vorgesehen, intended,
· dass mit einer Einrichtung zum Zuführen eines Kaltluftstroms dieser in den Bereich zwischen dem vorgeformten Schlauchabschnitt und einem Deckblatt und/oder einem Ventilzettel eingeleitet wird oder That with a device for supplying a cold air flow, this is introduced into the area between the preformed tube section and a cover sheet and / or a valve sheet or
• dass mit einer Einrichtung zum Zuführen eines Kaltluftstroms dieser in die Einrichtung zum Einleiten des Heißluftstroms in den Bereich zwischen einem vorgeformten Schlauchabschnitt und einem Deckblatt und/oder einem Ventilzettel eingeleitet wird. That with a device for supplying a cold air flow, this in the means for introducing the hot air flow in the area between a preformed tube section and a cover sheet and / or a valve sheet is initiated.
Mit diesem Verfahren werden die gleichen Vorteile erzielt, die bereits im Zusammenhang mit einer erfindungsgemäßen Vorrichtung beschrieben worden sind. With this method, the same advantages are achieved, which have already been described in connection with a device according to the invention.
Die in den Ansprüchen und in der Beschreibung der vorliegenden Patentanmeldung erwähnten Merkmale können jeweils einzeln für sich oder in beliebiger Kombination erfindungswesentlich sein. Darüber hinaus gehen Vorteile, Merkmale und Einzelheiten der Erfindung aus der nachfolgenden Beschreibung hervor, in der unter Bezugnahme auf die Figuren verschiedene Ausführungsbeispiele im Einzelnen erläutert sind. Im Rahmen der gesamten Offenbarung gelten Merkmale und Einzelheiten, die im Zusammenhang mit dem erfindungsgemäßen Verfahren beschrieben sind, selbstverständlich auch im Zusammenhang mit der erfindungsgemäßen Vorrichtung und jeweils umgekehrt, so dass bezüglich der Offenbarung zu den einzelnen Aspekten der Erfindung stets wechselseitig Bezug genommen wird beziehungsweise werden kann. Auch können einzelne Merkmale, auch wenn sie nur im Zusammenhang mit weiteren Merkmalen beschrieben werden bzw. worden sind, für sich genommen erfindungswesentlich sein. Daher sind solche Merkmale als kombinierbar mit beliebigen anderen offenbarten Merkmalen angesehen werden. Die einzelnen Figuren zeigen: The features mentioned in the claims and in the description of the present patent application may each be essential to the invention individually or in any desired combination. In addition, advantages, features and details of the invention will become apparent from the following description, in which reference to the figures, various embodiments are explained in detail. Within the scope of the entire disclosure, features and details described in connection with the method according to the invention apply, of course also in connection with the device according to the invention and in each case vice versa, so that mutual reference is or are always made with respect to the disclosure of the individual aspects of the invention can. Also, individual features, even if they are described or have been described only in connection with other features, taken by itself be essential to the invention. Therefore, such features are considered to be combinable with any other disclosed features. The individual figures show:
Fig. 1 Seitenansicht einer ersten Variante einer erfindungsgemäßen Fig. 1 side view of a first variant of an inventive
Vorrichtung  contraption
Fig. 2 Seitenansicht einer zweiten Variante einer erfindungsgemäßen  Fig. 2 side view of a second variant of an inventive
Vorrichtung  contraption
Fig. 3 Seitenansicht einer dritten Variante einer erfindungsgemäßen  Fig. 3 side view of a third variant of an inventive
Vorrichtung  contraption
Fig. 4 Seitenansicht einer vierten Variante einer erfindungsgemäßen  Fig. 4 side view of a fourth variant of an inventive
Vorrichtung  contraption
Fig. 5 Darstellung wesentlicher Schritte zur Hersteilung eines Ventilsacks aus einem Schlauchstück Eine erfindungsgemäße Vorrichtung kann auf der in der DE 195 02 255 C2, Figur 1, offenbarten Vorrichtung beruhen. Bei der Herstellung von Säcken aus beschichteten Kunststoffgewebeschläuchen sind mehrere Verfahrensschritte notwendig, die später anhand der Figur 4 näher erläutert werden. Insbesondere zum Verbinden verschiedener Bestandteile der späteren Säcke sind entsprechende Arbeitsstationen vorzusehen. Im Einzelnen sind dies: eine Arbeitsstation zum Aufbringen von Ventilzetteln, Arbeitsstationen zum Schließen der Böden und Arbeitsstationen zum Aufbringen von Bodendeckblättern, die die Böden der Säcke zusammenhalten bzw. verstärken. Auf den Einsatz von Arbeitsstationen zum Aufbringen der Bodendeckblätter kann gegebenenfalls verzichtet werden. Weitere Arbeitsstationen sind denkbar. Fig. 5 showing essential steps for Hersteilung a valve bag from a piece of hose A device according to the invention can be based on the device disclosed in DE 195 02 255 C2, FIG. In the production of bags made of coated plastic fabric hoses several process steps are necessary, which will be explained later with reference to FIG 4. In particular, for connecting various components of the later bags corresponding workstations are provided. Specifically, these are: a work station for applying valve leaflets, work stations for closing the floors, and work stations for applying ground cover sheets which hold together the floors of the bags. The use of workstations for applying the bottom cover sheets may possibly be dispensed with. Other workstations are conceivable.
In der Regel sind, bis auf die Arbeitsstation zum Aufbringen von Ventilzetteln, die Arbeitsstationen doppelt ausgeführt, so dass die entsprechenden Arbeiten gleichzeitig an beiden Enden der Schlauchstucke, welche in der Regel quer zu ihrer Schlauchlängsachse gefördert werden, ausgeführt werden können, Die Anzahl der Arbeitsstationen zum Einbringen der Ventilblätter oder -schlauche kann von dieser Regel, je nach gewünschter Anzahl der Ventile, abweichen. In general, except for the workstation for applying valve leaflets, the workstations are made double, so that the corresponding work can be performed simultaneously at both ends of the tubing pieces, which are usually conveyed transversely to their longitudinal axis hose, the number of workstations for introducing the valve leaves or hoses may differ from this rule, depending on the desired number of valves.
Die Figur 1 zeigt nun die Seitenansicht auf eine solche Arbeitsstation 1 in einer erfindungsgemäßen Vorrichtung, bei der es sich um eine Arbeitsstation zum Aufbringen von Bodendeckblättern 3, 3' auf Säcke 2 handelt. Die quer geförderten Säcke 2 liegen dabei auf einem Tisch 4 auf und werden durch ein geeignetes, in dieser Figur nicht dargestelltes Transportmittel in Transportrichtung z transportiert. Die bereits zugelegten Böden sind ebenfalls in die Ebene des Tisches gelegt. Die Erfindung ist hierauf jedoch nicht beschränkt, vielmehr können die Böden auch in einer Ebene liegen, die orthogonal zu der Ebene verläuft, die durch die Tischebene aufgespannt wird, FIG. 1 now shows the side view of such a workstation 1 in a device according to the invention, which is a workstation for applying bottom cover sheets 3, 3 'to sacks 2. The transversely conveyed bags 2 lie on a table 4 and are transported by a suitable, not shown in this figure transport in the transport direction z. The already added floors are also placed in the plane of the table. However, the invention is not limited to this, but the floors can also lie in a plane which is orthogonal to the plane which is spanned by the table level,
Über einen Zulauf 5 wird der Arbeitsstation 1 ein Bahnmaterial 6 zugeführt, von dem die Bodendeckblätter 3, 3' abgetrennt werden. Dazu wird das voraus laufende Ende des Bahnmaterials 6 vom Schneidzylinder 7 und dem Transportband 8 erfasst und vorgezogen und von der im Schneidzylinder 7 integrierten, aber nicht näher gezeigten Schneideinrichtung 9 quer geschnitten. Das so entstandene Bodendeckblatt 3, 3' wird vom Saugzylinder 10 übernommen und auf den Boden des Sackes 2 gelegt. Der Saugzylinder 10 bildet mit dem Gegendruckzylinder 11 einen Walzenspalt 12. Auf diese Weise wird das Bodendeckblatt 3' auf den Sack 2 mit hoher Kraft aufgepresst. In der Figur 1 ist bereits ein Teil des Sackes 2 mit aufliegendem Bodendeckblatt 3' durch den Walzenspalt geführt worden. Im Einlaufbereich des Walzenspaltes 12 ist eine Einrichtung 13 zum Erzeugen eines Heißluftstromes angeordnet, deren Heißluftstrom 18 in die Einlaufseite des Walzenspaltes 12 geleitet wird. Die Heißluft verursacht ein Anschmelzen der Beschichtung sowohl auf dem Boden des Sackes 2' als auch auf dem Bodendeckblatt 3'. Dabei werden, wie es der Figur 1 entnehmbar ist, die Beschichtungen der Oberflächen angeschmolzen bzw. plastifiziert, die unmittelbar danach zusammengebracht werden. Das Zusammenbringen der Oberflächen mit dem noch angeschmolzenen Beschichtungsmaterial erfolgt in dem Walzenspalt 12, so dass die Beschichtungen nunmehr eine Zwischenschicht, die als homogen angesehen werden kann, zwischen Bodendeckblatt und Boden bilden, welche die genannten Bestandteile nach dem Auskühlen dauerhaft verbindet. Aufgrund dieses Ablaufes kann der Einlaufbereich des Walzenspaltes als Siegelbereich bezeichnet werden. Die Zylinder 10 und 11 drehen dabei in Richtung der Pfeile R und R". Via a feed 5 of the workstation 1, a web material 6 is supplied, from which the bottom cover sheets 3, 3 'are separated. For this purpose, the leading end of the web material 6 is detected by the cutting cylinder 7 and the conveyor belt 8 and pulled forward and from the cutting cylinder in the 7th integrated, but not shown in detail cutting device 9 cut transversely. The resulting bottom cover sheet 3, 3 'is taken over by the suction cylinder 10 and placed on the bottom of the bag 2. The suction cylinder 10 forms with the impression cylinder 11 a nip 12. In this way, the bottom cover sheet 3 'is pressed onto the bag 2 with high force. In the figure 1, a part of the bag 2 has already been performed with resting ground cover sheet 3 'through the nip. In the inlet region of the nip 12, a device 13 for generating a hot air stream is arranged, the hot air stream 18 is passed into the inlet side of the nip 12. The hot air causes a melting of the coating both on the bottom of the bag 2 'and on the bottom cover sheet 3'. In this case, as can be seen in FIG. 1, the coatings of the surfaces are melted or plasticized, which are brought together immediately afterwards. The bringing together of the surfaces with the still fused coating material takes place in the nip 12, so that the coatings now form an intermediate layer, which can be regarded as homogeneous, between ground cover sheet and ground, which permanently connects said components after cooling. Due to this process, the inlet area of the nip can be referred to as a sealing area. The cylinders 10 and 11 rotate in the direction of the arrows R and R ".
Die Einrichtung zum Erzeugen eines Heißluftstroms 13 umfasst zunächst als zentrales Element ein Heißluftgebläse 20, welches ein Gebläse mit integrierten oder nachgeschalteten Heizmittel umfasst. Die Ansaugung von Umgebungsluft erfolgt über die Leitung 21, welche insbesondere als Schlauch ausgestaltet sein kann. In Förderrichtung der Heißluft gesehen hinter dem Heißluftgebläse 20 ist ein optionaler Drehschieber 22 vorgesehen, mit welchem der Heißluftstrom unterbrechbar ist. Dabei wird insbesondere der Heißluftstrom, wenn er nicht benötigt wird (also in den Zeiträumen, in denen sich kein Sack ist dem Siegelbereich befindet), umgelenkt und an die Umgebung abgegeben. Der Drehschieber 22 kann mittels eines Rohrstücks 23 vom Heißluftgebläse 20 beabstandet sein. Der Heißluftstrom gelangt nun in eine Düse 24, die diesen Heißluftstrom vorzugsweise auf die Breite der Bodens des Sacks 2 verbreitet und dabei ihn zielgerichtet auf den Einlaufbereich des Walzenspaltes 12 fokussiert. The device for generating a hot air flow 13 initially comprises, as a central element, a hot air blower 20, which comprises a blower with integrated or downstream heating means. The intake of ambient air via the line 21, which may be configured in particular as a hose. In the conveying direction of the hot air behind the hot air blower 20, an optional rotary valve 22 is provided, with which the hot air flow can be interrupted. In particular, the hot air flow, when it is not needed (ie in the periods in which no bag is the sealing area), deflected and released to the environment. The rotary valve 22 may be spaced from the hot air blower 20 by means of a pipe section 23. The hot air stream now passes into a nozzle 24, which spreads this hot air stream preferably to the width of the bottom of the bag 2 while focused him targeted to the inlet region of the nip 12.
Um eine Kaltluftzufuhr realisieren zu können, kann in der Düse 24 eine Öffnung vorgesehen sein, in die ein die Kaltluft zuführendes Rohr 25 oder Schlauch münden kann. Dieses Rohr 25 oder dieser Schlauch können ein schnellschaltendes Ventil 26 umfassen, mit welchem ein Kaltluftstrom unterbrechbar oder durchleitbar ist Weiterhin schematisch ist dargestellt eine Pumpe oder ein Gebläse 27, welches dafür vorgesehen ist, die Kaltluft unter ausreichend hohen Druck zu setzen, so dass nach Öffnung des schnellschaltenden Ventils auch unmittelbar der Kaltluftstrom den Einlaufbereich des Walzenspalts 12 erreicht, um dort durch Vermischung die Temperatur des Heißluftstroms herabsetzt. Nicht dargestellt ist eine Temperiereinheit, mit welcher die Temperatur des Kaltluftstroms beeinflussbar ist In order to be able to realize a cold air supply, an opening can be provided in the nozzle 24, into which a pipe 25 supplying the cold air or hose can open. This tube 25 or this tube may comprise a fast-switching valve 26, with which a cold air flow can be interrupted or passed on. Also shown schematically is a pump or a blower 27, which is provided to put the cold air under a sufficiently high pressure, so that after opening the fast-switching valve also directly the cold air flow reaches the inlet region of the nip 12, where it reduces by mixing the temperature of the hot air flow. Not shown is a tempering, with which the temperature of the cold air flow can be influenced
In der weiteren Ausfuhrungsform der Erfindung gemäß Figur 2 kann auf den Drehschieber 22 verzichtet werden, da nun mit der Kaltluftzufuhr ein Siegeln ebenso unterdrückt werden kann wie mit dem Ableiten der Heißluft aufgrund der Betätigung des Drehschiebers 22. In the further embodiment of the invention according to Figure 2 can be dispensed with the rotary valve 22, since now with the cold air supply sealing can be suppressed as well as with the discharge of the hot air due to the operation of the rotary valve 22nd
Die Figur 3 zeigt nun eine Ausführungsvariante der Figur 1 , bei der das Rohr oder der Schlauch 25 nicht im Bereich der Düse 24 endet, sondern mit einer eigenen Düse 28 versehen ist. Mit dieser Düse 28 lässt sich der Kaltluftstrom direkt in den Siegeibereich einleiten. Diese Anordnung hat den Vorteil, dass sie an bereits vorhandenen Maischinen nachgerüstet werden kann. FIG. 3 now shows a variant of FIG. 1 in which the tube or tube 25 does not terminate in the region of the nozzle 24, but is provided with its own nozzle 28. With this nozzle 28, the cold air flow can be introduced directly into the Siegeibereich. This arrangement has the advantage that it can be retrofitted to existing mashines.
Die Figur 4 zeigt nun eine weitere Ausführungsvariante der erfindungsgemäßen Vorrichtung, bei der der Schlauch bzw. das Rohr 25 in die Leitung 21 mündet und damit einen Kaltluftstrom zuführt, um den zugeführten Luftstrom aus der Umgebung kühlen zu können. Der damit auftretende Effekt wurde bereits weiter oben beschrieben. Die Figur 5 verdeutlicht schließlich die Schritte zur Anformung von Böden an den späteren Sack 2, der zunächst als Schlauchstück 40 vorliegt, wobei das Schiauchstück mittels der Transporteinrichtung 41 zu den einzelnen Stationen, mit welchen die Schritte zum Anformen von Böden an Schlauchstücken durchführbar sind, verbringbar ist. In der Darstellung a) wird wenigstens ein Ende, vorzugsweise beide Enden, des Schlauchstücks aufgezogen, wobei die obere Lage entlang der Bodenmittenlinie 42 zurückgefaltet wird, so dass sich das Bodenrechteck 43 und die Dreieckstaschen 44 ausbilden. In dieser Darstellung sind mit strichpunktierten Linien die zweiten Falzkanten 45 eingezeichnet, um die die Seitenlaschen 46, 47, mit welchen die Bereiche jenseits der zweiten Falzkanten bezeichnet werden, umgefaltet werden. FIG. 4 now shows a further embodiment variant of the device according to the invention, in which the hose or the pipe 25 opens into the line 21 and thus supplies a stream of cold air in order to be able to cool the supplied air stream from the environment. The resulting effect has already been described above. Finally, FIG. 5 illustrates the steps for molding floors onto the later sack 2, which initially exists as a piece of hose 40, the ski piece being transferable by means of the transport device 41 to the individual stations with which the steps for molding floors on hose pieces can be carried out is. In the illustration a), at least one end, preferably both ends, of the piece of tubing is raised, the top layer being folded back along the bottom center line 42, so that the bottom rectangle 43 and the triangular pockets 44 are formed. In this illustration, the second folded edges 45 are drawn with dotted lines around which the side flaps 46, 47, with which the areas are designated beyond the second folding edges, are folded.
Um diese zweiten Falzkanten werden im Schritt c) und d) die Seitenlaschen 46 und 47 umgelegt, was vorzugsweise zeitlich leicht versetzt erfolgt, um keine Störung hervorzurufen. Es ist nun ein zugelegter Boden 48 entstandein. Im Schritt b) wurde zuvor noch auf eine Dreieckstasche ein so genannter Ventilzettel 49 befestigt, welches später eine Öffnung zum Befüllen des fertigen Sacks zur Verfügung stellt. Im abschließenden Schritt e) wird nun ein Deckblatt 50 so auf dem Sackboden befestigt, dass beide Seitenlaschen miteinander und mit den sich beidseitig anschließenden Dreieckstaschen verbunden werden. The side flaps 46 and 47 are folded around these second folded edges in step c) and d), which is preferably slightly offset in time so as not to cause a disturbance. It is now an added ground 48 arose. In step b), a so-called valve sheet 49 was previously attached to a triangular pocket, which later provides an opening for filling the finished bag. In the concluding step e), a cover sheet 50 is then fastened on the bottom of the bag in such a way that both side flaps are connected to one another and to the triangular pockets adjoining on both sides.
Der zweite, optionale Boden 51 wurde auf gleiche Weise und vorzugsweise simultan erzeugt, jedoch ohne Einbringen eines Ventils. The second optional tray 51 has been produced in the same way and preferably simultaneously, but without the introduction of a valve.
Figure imgf000013_0001
Figure imgf000014_0001
Figure imgf000013_0001
Figure imgf000014_0001

Claims

Patentansprüche 1 . Vorrichtung zur Herstellung von Säcken aus Kunststoffmaterial mit einem Heißluftaggregat zur Bereitstellung eines Heißluftstroms, einer Einrichtung (29, 30) zum Einleiten dieses Heißluftstroms in den Bereich zwischen einem vorgeformten Schlauchabschnitt (2) und einem Deckblatt und/oder einem Ventilzettel, wobei der Schlauchabschnitt und das Deckblatt und/oder der Ventilzettel mittels Fördereinrichtungen förder- und aufeinander ablegbar sind, Claims 1. A device for producing bags of plastic material with a hot air unit for providing a hot air flow, means (29, 30) for introducing this hot air flow into the area between a preformed tube section (2) and a cover sheet and / or a valve sheet, the tube section and the Cover sheet and / or the valve leaflets are conveyable by means of conveying devices and can be placed on one another,
gekennzeichnet durch  marked by
wenigstens eine Einrichtung zum Zuführen eines Kaltluftstroms in den Bereich zwischen dem vorgeformten Schlauchabschnitt (2) und einem Deckblatt und/oder einem Ventilzettel oder zum Zuführen eines Kaltluftstroms in die Einrichtung zum Einleiten des Heißluftstroms in den Bereich zwischen einem vorgeformten Schlauchabschnitt (2) und einem Deckblatt und/oder einem Ventilzettel. 2. Vorrichtung nach Anspruch 1 ,  at least one means for feeding a stream of cold air into the region between the preformed tube section (2) and a cover sheet and / or a valve sheet or for supplying a cold air stream into the means for introducing the stream of hot air into the region between a preformed tube section (2) and a cover sheet and / or a valve leaflet. 2. Apparatus according to claim 1,
dadurch gekennzeichnet, dass  characterized in that
die Einrichtung zum Zuführen eines Kaltluftstrom ein Ventil umfasst, welches eine Reaktionszeit von weniger als 100 ms, vorzugsweise weniger als 50 ms, insbesondere weniger als 20 ms aufweist. 3. Vorrichtung nach einem der vorstehenden Ansprüche,  the device for supplying a cold air flow comprises a valve which has a reaction time of less than 100 ms, preferably less than 50 ms, in particular less than 20 ms. 3. Device according to one of the preceding claims,
dadurch gekennzeichnet, dass characterized in that
der Heißluftstrom mit fest eingestellten Parametern» insbesondere mit fest eingestellter Temperatur und/oder einem fest eingestellten Luftdruck, bereitstellbar ist, in welchen der Kaltluftstrom einblasbar ist. 4. Vorrichtung nach einem der vorstehenden Ansprüche, the hot air flow with fixed parameters »in particular with fixed set temperature and / or a fixed air pressure, can be provided, in which the cold air flow is inflated. 4. Device according to one of the preceding claims,
dadurch gekennzeichnet, dass  characterized in that
der Einrichtung zum Zuführen eines Kaltluftstroms eine Druckluftquelle vorgeschaltet ist. 5. Verfahren zur Herstellung von Säcken aus Kunststoffmaterial, wobei  the device for supplying a cold air flow, a compressed air source is connected upstream. 5. A method for producing bags of plastic material, wherein
• mit einem Heißluftaggregat ein Heißluftstrom bereitgestellt wird,  A hot air flow is provided with a hot-air generator,
• mit einer Einrichtung (29, 30) zum Einleiten des Heißluftstroms dieser in den Bereich zwischen einem vorgeformten Schlauchabschnitt (2) und einem Deckblatt und/oder einem Ventilzettel eingeleitet wird, wobei der Schlauchabschnitt und das Deckblatt und/oder der Ventilzettel mittels Fördereinrichtungen gefördert- und aufeinander abgelegt werden,  With a device (29, 30) for introducing the hot air flow into the region between a preformed hose section (2) and a cover sheet and / or a valve sheet, the hose section and the cover sheet and / or the valve sheet being conveyed by means of conveyors. and be placed on top of each other,
dadurch gekennzeichnet,  characterized,
• dass mit einer Einrichtung zum Zufuhren eines Kaltluftstroms dieser in den Bereich zwischen dem vorgeformten Schlauchabschnitt (2) und einem Deckblatt und/oder einem Ventilzettel eingeleitet wird, oder  • that is introduced with a device for supplying a cold air flow in the area between the preformed tube section (2) and a cover sheet and / or a valve sheet, or
• dass mit einer Einrichtung zum Zuführen eines Kaltluftstroms dieser in die Einrichtung zum Einleiten des Heißluftstroms in den Bereich zwischen einem vorgeformten Schlauchabschnitt (2) und einem Deckblatt und/oder einem Ventilzettel eingeleitet wird.  • that means for supplying a cold air flow is introduced into the device for introducing the hot air flow in the region between a preformed hose section (2) and a cover sheet and / or a valve sheet.
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EP3670171A1 (en) * 2018-12-17 2020-06-24 Starlinger & Co Gesellschaft m.b.H. Device and method for applying cover sheets to preformed cross-bottom ends of tubular sections
RU2792766C2 (en) * 2018-12-17 2023-03-23 Штарлингер Унд Ко Гезелльшафт М.Б.Х. Device and method for applying cover sheets to ends of cuts of hoses formed into cross-shaped bottoms

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DE19502255C2 (en) 1995-01-25 1996-11-28 Windmoeller & Hoelscher Device for applying notes from plastic film on flat workpieces
DE10104002A1 (en) * 2000-12-12 2002-07-18 Windmoeller & Hoelscher Process for tempering plastic films to be glued and device for gluing plastic films with temperature-controlled transport roller

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DE2118001A1 (en) * 1970-04-14 1971-12-23 Pembroke Carton & Printing Co Method for heating a nozzle or the like in a heat sealing process supplied gases and device for its implementation
DE19502255C2 (en) 1995-01-25 1996-11-28 Windmoeller & Hoelscher Device for applying notes from plastic film on flat workpieces
DE10104002A1 (en) * 2000-12-12 2002-07-18 Windmoeller & Hoelscher Process for tempering plastic films to be glued and device for gluing plastic films with temperature-controlled transport roller

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Publication number Priority date Publication date Assignee Title
EP3670171A1 (en) * 2018-12-17 2020-06-24 Starlinger & Co Gesellschaft m.b.H. Device and method for applying cover sheets to preformed cross-bottom ends of tubular sections
WO2020126382A1 (en) 2018-12-17 2020-06-25 Starlinger & Co Gesellschaft M.B.H. Apparatus and method for applying cover sheets to ends, preformed into cross bottoms, of tube portions
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US11446881B2 (en) 2018-12-17 2022-09-20 Starlinger & Co Gesselschaft M.B.H Apparatus and method for applying cover sheets to ends, preformed into cross bottoms, of tube portions
RU2792766C2 (en) * 2018-12-17 2023-03-23 Штарлингер Унд Ко Гезелльшафт М.Б.Х. Device and method for applying cover sheets to ends of cuts of hoses formed into cross-shaped bottoms

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