GB1167549A - Improvements relating to Ultrasonic Welding - Google Patents

Improvements relating to Ultrasonic Welding

Info

Publication number
GB1167549A
GB1167549A GB55323/66A GB5532366A GB1167549A GB 1167549 A GB1167549 A GB 1167549A GB 55323/66 A GB55323/66 A GB 55323/66A GB 5532366 A GB5532366 A GB 5532366A GB 1167549 A GB1167549 A GB 1167549A
Authority
GB
United Kingdom
Prior art keywords
anvil
welding
depressions
edge
line
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.)
Expired
Application number
GB55323/66A
Inventor
George William King
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.)
Radyne Ltd
Original Assignee
Radyne Ltd
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 Radyne Ltd filed Critical Radyne Ltd
Publication of GB1167549A publication Critical patent/GB1167549A/en
Expired legal-status Critical Current

Links

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
    • 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
    • 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
    • B29C65/08—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations
    • B29C65/081—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations having a component of vibration not perpendicular to the welding surface
    • 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
    • B29C65/08—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations
    • B29C65/083—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations using a rotary sonotrode or a rotary anvil
    • B29C65/086—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations using a rotary sonotrode or a rotary anvil using a rotary anvil
    • 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
    • B29C65/08—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations
    • B29C65/083—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations using a rotary sonotrode or a rotary anvil
    • B29C65/087—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations using a rotary sonotrode or a rotary anvil using both a rotary sonotrode and a rotary anvil
    • 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
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
    • B29C66/21—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being formed by a single dot or dash or by several dots or dashes, i.e. spot joining or spot welding
    • 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
    • B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
    • B29C66/22—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being in the form of recurring patterns
    • B29C66/221—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being in the form of recurring patterns being in the form of a sinusoidal wave
    • 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
    • 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
    • B29C66/81—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
    • B29C66/814—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 design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—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 design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81427—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 design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined comprising a single ridge, e.g. for making a weakening line; comprising a single tooth
    • 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
    • B29C66/814—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 design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—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 design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81433—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 design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined being toothed, i.e. comprising several teeth or pins, or being patterned
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

1,167,549. Seaming non-metallic sheet material. RADYNE Ltd. 8 March, 1968 [9 Dec., 1966 (2)], Nos. 55322/66 and 55323/66. Heading B5K. Thermoplastic materials 13, 14 are seamwelded by passing them between adjacent parts of a vibrating tool 15 and a rotating anvil 10, at least one of the parts being formed with depressions so arranged that the resulting weld is in the form of an interrupted line or a line made up of portions having transverse components of direction with respect to the principal direction of the welding line. Preferably, the depressions are formed in the edge of the anvil 10. In one embodiment, Fig. 1, the tool 15 is situated above a slotted work-table 12 and is of the piezoelectric, magnetostrictive or electromagnetic type. The anvil 10, which also feeds the materials 13, 14, has depressions to form a cross-stitch pattern weld. In modifications, the edge of the anvil resembles a blunt-toothed gear, Fig. 2 (not shown), the welding portion forms a zig-zag pattern around the anvil periphery, Fig. 4 (not shown), or the welding portions on the anvil periphery are diamond-shaped, Fig. 3 (not shown). In another embodiment, Fig. 5, the vibrating tool comprises a disc 20 arranged obliquely to the welding table 12 and having a conical welding edge 21.
GB55323/66A 1966-12-09 1966-12-09 Improvements relating to Ultrasonic Welding Expired GB1167549A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5532266 1966-12-09

Publications (1)

Publication Number Publication Date
GB1167549A true GB1167549A (en) 1969-10-15

Family

ID=10473568

Family Applications (1)

Application Number Title Priority Date Filing Date
GB55323/66A Expired GB1167549A (en) 1966-12-09 1966-12-09 Improvements relating to Ultrasonic Welding

Country Status (1)

Country Link
GB (1) GB1167549A (en)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2851485A1 (en) * 1977-11-29 1979-05-31 Faure Bertrand Ind METHOD OF ULTRASONIC WELDING OF A SOFT, THERMOPLASTIC MATERIAL TO A BODY MADE OF STIFF, THERMOPLASTIC MATERIAL
FR2446170A1 (en) * 1979-01-10 1980-08-08 Zelant Gazuit Scarf jointing unvulcanised rubber for tyres - using machine which grips with inclined rollers and applies pressure each side (NL 14.7.80)
FR2507531A1 (en) * 1981-06-12 1982-12-17 Mecasonic Sa Ultrasonically welding of hard, medium or soft thermoplastic films - using appts. having cylindrical head reciprocating axially on rod connected to oscillator
FR2510937A1 (en) * 1981-08-07 1983-02-11 Pola Chem Ind Inc METHOD AND APPARATUS FOR JOINING MELT FUSION OF A SYNTHETIC RESIN TUBULAR CONTAINER
AT382112B (en) * 1983-12-27 1987-01-12 Trentini & Cie Kommanditgesell WELDING DEVICE
EP0340334A2 (en) * 1988-05-05 1989-11-08 Drescher Geschäftsdrucke Gmbh Apparatus for joining two or multilayered paper articles together
FR2677049A1 (en) * 1991-05-30 1992-12-04 Kb Sa Ultrasonic welding electrode, welding assembly including the sonotrode and method of welding with the aid of the said sonotrode
EP0569735A1 (en) * 1992-04-23 1993-11-18 Tetra Laval Holdings & Finance SA An apparatus for sealing by surface fusion of mutually facing surfaces of thermoplastic materials or coatings, and the use of a giant magnetostrictive powder composite for this purpose
GB2299538A (en) * 1995-04-04 1996-10-09 Michael John Radley Young Asperities on an ultrasonic welding apparatus anvil
US6098684A (en) * 1997-03-31 2000-08-08 Brother Kogyo Kabushiki Kaisha Ultrasonic welding/cutting machine
WO2010139464A1 (en) * 2009-06-05 2010-12-09 Sonotronic Nagel Gmbh Ultrasonic welding tool
DE102009024258A1 (en) * 2009-06-05 2010-12-09 Sonotronic Nagel Gmbh Ultrasonic-welding tool e.g. anvil, for production of thin welding seam for connecting two plastic foils, has multiple elevations arranged next to each other and separated from each other by gaps
WO2012126732A1 (en) 2011-03-23 2012-09-27 Robert Bosch Gmbh Method for attaching an opening and closing device to a tubular bag by means of ultrasonic welding
EP2905317A3 (en) * 2014-02-10 2015-08-26 Wolford Aktiengesellschaft Pantyhose

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2851485A1 (en) * 1977-11-29 1979-05-31 Faure Bertrand Ind METHOD OF ULTRASONIC WELDING OF A SOFT, THERMOPLASTIC MATERIAL TO A BODY MADE OF STIFF, THERMOPLASTIC MATERIAL
FR2446170A1 (en) * 1979-01-10 1980-08-08 Zelant Gazuit Scarf jointing unvulcanised rubber for tyres - using machine which grips with inclined rollers and applies pressure each side (NL 14.7.80)
FR2507531A1 (en) * 1981-06-12 1982-12-17 Mecasonic Sa Ultrasonically welding of hard, medium or soft thermoplastic films - using appts. having cylindrical head reciprocating axially on rod connected to oscillator
FR2510937A1 (en) * 1981-08-07 1983-02-11 Pola Chem Ind Inc METHOD AND APPARATUS FOR JOINING MELT FUSION OF A SYNTHETIC RESIN TUBULAR CONTAINER
AT382112B (en) * 1983-12-27 1987-01-12 Trentini & Cie Kommanditgesell WELDING DEVICE
EP0340334A2 (en) * 1988-05-05 1989-11-08 Drescher Geschäftsdrucke Gmbh Apparatus for joining two or multilayered paper articles together
EP0340334A3 (en) * 1988-05-05 1991-03-06 Drescher Geschäftsdrucke Gmbh Apparatus for joining two or multilayered paper articles together
FR2677049A1 (en) * 1991-05-30 1992-12-04 Kb Sa Ultrasonic welding electrode, welding assembly including the sonotrode and method of welding with the aid of the said sonotrode
EP0569735A1 (en) * 1992-04-23 1993-11-18 Tetra Laval Holdings & Finance SA An apparatus for sealing by surface fusion of mutually facing surfaces of thermoplastic materials or coatings, and the use of a giant magnetostrictive powder composite for this purpose
GB2299538A (en) * 1995-04-04 1996-10-09 Michael John Radley Young Asperities on an ultrasonic welding apparatus anvil
GB2299538B (en) * 1995-04-04 1998-11-04 Michael John Radley Young Method and apparatus for ultrasonic welding of materials
US6098684A (en) * 1997-03-31 2000-08-08 Brother Kogyo Kabushiki Kaisha Ultrasonic welding/cutting machine
WO2010139464A1 (en) * 2009-06-05 2010-12-09 Sonotronic Nagel Gmbh Ultrasonic welding tool
DE102009024258A1 (en) * 2009-06-05 2010-12-09 Sonotronic Nagel Gmbh Ultrasonic-welding tool e.g. anvil, for production of thin welding seam for connecting two plastic foils, has multiple elevations arranged next to each other and separated from each other by gaps
WO2012126732A1 (en) 2011-03-23 2012-09-27 Robert Bosch Gmbh Method for attaching an opening and closing device to a tubular bag by means of ultrasonic welding
DE102011005997A1 (en) 2011-03-23 2012-09-27 Robert Bosch Gmbh Method for attaching an opening and closing device to a tubular bag by means of ultrasonic welding
EP2905317A3 (en) * 2014-02-10 2015-08-26 Wolford Aktiengesellschaft Pantyhose

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