US3244573A - Heat and tear sealing dies - Google Patents

Heat and tear sealing dies Download PDF

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Publication number
US3244573A
US3244573A US19622862A US3244573A US 3244573 A US3244573 A US 3244573A US 19622862 A US19622862 A US 19622862A US 3244573 A US3244573 A US 3244573A
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US
United States
Prior art keywords
die
dies
heat
plug
tear
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 - Lifetime
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English (en)
Inventor
Sr Milo Louis Raffaelli
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.)
Scholl Manufacturing Co Inc
Original Assignee
Scholl Manufacturing Co Inc
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
Priority to GB1051611D priority Critical patent/GB1051611A/en
Application filed by Scholl Manufacturing Co Inc filed Critical Scholl Manufacturing Co Inc
Priority to US19622862 priority patent/US3244573A/en
Priority to DESCH33805U priority patent/DE1924137U/de
Priority to US45332665 priority patent/US3305421A/en
Application granted granted Critical
Publication of US3244573A publication Critical patent/US3244573A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • B29C65/74—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area
    • B29C65/743—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area using the same tool for both joining and severing, said tool being monobloc or formed by several parts mounted together and forming a monobloc
    • B29C65/7441—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area using the same tool for both joining and severing, said tool being monobloc or formed by several parts mounted together and forming a monobloc for making welds and cuts of other than simple rectilinear form
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/06—Bandages or dressings; Absorbent pads specially adapted for feet or legs; Corn-pads; Corn-rings
    • A61F13/064—Bandages or dressings; Absorbent pads specially adapted for feet or legs; Corn-pads; Corn-rings for feet
    • A61F13/067—Bandages or dressings; Absorbent pads specially adapted for feet or legs; Corn-pads; Corn-rings for feet for the sole of the foot
    • 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
    • B29C65/04—Dielectric heating, e.g. high-frequency welding, i.e. radio frequency welding of plastic materials having dielectric properties, e.g. PVC
    • 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
    • B29C65/74—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area
    • B29C65/743—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area using the same tool for both joining and severing, said tool being monobloc or formed by several parts mounted together and forming a monobloc
    • B29C65/7437—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area using the same tool for both joining and severing, said tool being monobloc or formed by several parts mounted together and forming a monobloc the tool being a perforating tool
    • 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
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/13—Single flanged joints; Fin-type joints; Single hem joints; Edge joints; Interpenetrating fingered joints; Other specific particular designs of joint cross-sections not provided for in groups B29C66/11 - B29C66/12
    • B29C66/133—Fin-type joints, the parts to be joined being flexible
    • 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
    • B29C66/436—Joining sheets for making articles comprising cushioning or padding materials, the weld being performed through the cushioning material, e.g. car seats
    • 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
    • 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
    • B29C66/812—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 composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B29C66/8126—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 composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps characterised by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B29C66/81262—Electrical and dielectric properties, e.g. electrical conductivity
    • 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
    • B29C66/812—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 composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B29C66/8126—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 composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps characterised by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B29C66/81262—Electrical and dielectric properties, e.g. electrical conductivity
    • B29C66/81263—Dielectric properties
    • 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
    • B29C66/81431—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 cavity, e.g. a groove
    • 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
    • B29C66/8145—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 constructional aspects of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/81457—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 constructional aspects of the pressing elements, e.g. of the welding jaws or clamps comprising a block or layer of deformable material, e.g. sponge, foam, rubber
    • 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
    • B29C66/816—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 mounting of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8167—Quick change joining tools or surfaces
    • 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
    • B29C66/832—Reciprocating joining or pressing tools
    • B29C66/8322—Joining or pressing tools reciprocating along one axis
    • 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
    • B29C2793/0009—Cutting out
    • B29C2793/0018—Cutting out for making a hole
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • 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
    • B29C66/727—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 being porous, e.g. foam
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • 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
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    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/80—General aspects of machine operations or constructions and parts thereof
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    • 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
    • B29C66/81411—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 characterised by its cross-section, e.g. transversal or longitudinal, being non-flat
    • B29C66/81415—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 characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being bevelled
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    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/04—Condition, form or state of moulded material or of the material to be shaped cellular or porous
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B29L2031/753—Medical equipment; Accessories therefor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
    • Y10T156/12—Surface bonding means and/or assembly means with cutting, punching, piercing, severing or tearing
    • Y10T156/1313—Cutting element simultaneously bonds [e.g., cut seaming]

Definitions

  • This invention relates to improvements in heat and tear sealing dies, the dies being of the electrode type for electronic high frequency heat sealing, and particularly desirable for use with plastic sheet and foam materials, effecting both a fine edge heat seal seam and at the same time providing a tear line immediately adjacent the seam for the easy removal of waste stock from the finished product, the dies and method of use being both highly suitable in connection with the commercial manufacture of surgical pads, foot cushioning and corrective devices, miscellaneous applicators, and the like, although the dies and method may be used for other purposes, as will be apparent to one skilled in the art.
  • Another object of this invention resides in the provision of heat sealing dies, highly suitable for acting upon synthetic resin foams and sheets, and which dies are so constructed as to complete a finished product in a single operation, both establishing the essential heat and tear seal seams and also reshaping and providing what may be termed a permanent set in the reshaped material of the final product.
  • Another desideratum of this invention is the production of heat sealing dies capable of producing articles varying in thickness from sheets of different areas, the dies being so constructed that precut blanks of stock material may be quickly, easily, and accurately positioned to be acted upon by the dies.
  • FIGURE 1 is a bottom plan View of an upper electrode die embodying principles of the instant invention
  • FIGURE 2 is a top plan view of a lower electrode die embodying principles of the instant invention and which cooperates with the die of FIGURE 1;
  • FIGURE 3 is a plan view of an article made by operation of the dies of FIGURES l and 2;
  • FIGURE 4 is a fragmentary enlarged vertical sectional view of the article itself, taken substantially as indicated by the line 1VIV of FIGURE 3, looking in the direction of the arrows;
  • FIGURE 5 is a transverse vertical sectional view through the lower die, taken substantially as indicated by the line VV of FIGURE 2;
  • FIGURE 6 is a transverse vertical sectional view through the upper die, taken substantially as indicated by the line VI-VI of FIGURE 1;
  • FIGURE 7 is a plan View of the lower die, showing the assemblage of blanks thereon for the production of the article of FIGURES 3 and 4, with parts broken away to reveal parts therebeneath;
  • FIGURE 8 is a vertical sectional view showing the formation of an article like that of FIGURE 3 by action of the dies;
  • FIGURE 9 is a fragmentary plan view illustrating a finished product, removal of waste therefrom, and the completion step of the method involved in making that product;
  • FIGURE 10 is a view similar in character to FIGURE 7 showing the assemblage of material on the lower die after the same has been adjusted for the production of an article differing specifically from that of FIGURES J 3 and 4, parts being broken away to reveal parts therebeneath;
  • FIGURE 11 is a view similar in character to FIGURE 8, after the upper die has been adjusted for the specifically different article, showing the dies in operation forming the article;
  • FIGURE 12 is an enlarged fragmentary vertical sectional View through the article made by the adjusted dies of FIGURES l and 11.
  • the upper die comprises a base plate 1 of electrically conductive metal. Secured to this base plate is a plurality of die members, there being four shown in the illustrated instance, but it will be understood that this number may be varied as desired or to correspond to the capacity of the particular heat sealing press available.
  • Each die member is preferably cup-shaped and comprises a bottom 2 and a depending skirt 3 integral there with, the skirt in the illustrated instance being substantially oval in contour.
  • the die member may be made satisfactorily of bronze, brass, or some other suitably electrically conductive metal of sufficient durability.
  • the die member may be secured to, the base in any satisfactory manner such as by bolts 4, FIGURE 6, and it may be desirable to solder or copper braze the element to the base as well to insure a complete electrical connection with the base.
  • the working edge of the skirt 3 slopes inwardly as indicated at 5 to provide a surrounding knife edge 6 This working edge arrangement provides both a heat and tear seal seam when the die is energized while pressing into the material being heat sealed.
  • auxiliary cup-shaped die element 7 which may be removably secured to the bottom 2 of the die element by a bolt and nut assembly 8, access being provided thereto by way of a suitable aperture 9. in the die base 1, as seen in FIGURE 6.
  • the auxiliary element 7 may have any suitable shape and size as desired for a particular finished product, and in the illustrated instance. it is shown circular.
  • the working edge of the skirt of the auxiliary element 7 is fiat as indicated at 10 so that this auxiliary element will provide a heat seal seam but no tear line.
  • each die element is preferably provided at the desired location for the digit loop with a pair of opposed upstanding heat sealing strips 1111 bolted, or equivalently removably secured to the inner face of the skirt 3 as indicated at 12, the upper ends of these strips being fiat so as to provide only a heat seal seam but no tear line, and terminating even with the inside edge of the slope 5 on the skirt 3 well below the knife edge 6.
  • Each die member is preferably relieved inside the skirt 3 and around the auxiliary element 7 by a resilient block 13 or stack of blocks as may be desired, which relief substance 13 may be sponge rubber or any equivalent material. The provision of the relief substance is to insure all resultant articles being of uniform thickness.
  • the lower die seen in FIGURES 2 and 5, need not be provided with any outline defining means, but may satisfactorily be in the nature of a flat plate 14 of electrically conductive material, preferablyv provided with an upstanding guide flange 15 along the rear and one end edge. At the front side edge thereof, the plate is formed with a plurality of outwardly extending curvate projections 16, there being one for each of the die elements in the upper die. Each of these projections 16. is provided with a depending flange 17 which may satisfactorily be of sector shape. At the rear of the plate 14 spaced somewhat inwardly. from the flange 15 are a pair of upstanding guide pins 1818, any suitable or desirable number being used.
  • the lower die is also provided with a recess 19 in proper location to be surrounded by the working edge of the auxiliary die element 7 when the dies are brought together.
  • Each such recess is provided with a relief block 20 of sponge rubber or equivalent material, and seated freely on the block 20 is a dome forming plug 21 which may satisfactorily be formed of thermosetting plastic or other suitable non-conductive material.
  • This dome forming plug is relieved because while the pieces to be joined together by the dies are stacked upon the lower die, more than useful height of the plug is needed to accommodate the stacked or superposed blanks and during operation of the dies as the blanks are compressed, the plug 21 descends against the action of the relief block 20 to the proper height for forming a dome in the finished article.
  • FIGURES 3 and 4 I have illustrated the product made by the dies above described.
  • the product is in the form of a surgical pad having an elastic digit loop, the pad being shaped for the alleviation of a bunion or similar afiliction of the foot, and it will of course be understood that made in a smaller size, the pad will be effective for the alleviation of a tailors bunion.
  • the particular pad illustrated is one desirable for use where there may be exudation from the affliction, or where the affliction is sensitiveto frictional contact with even light wearing apparel such as a stocking. V
  • the pad comprises a lower layer 22 of heat scalable plastic film such-as a vinyl or acetate film, a lower layer 23 of heat scalable foam such as polyvinyl chloride foam, polyurethane foam, or equivalent material, a partial upper layer 24 of the same foam, and a cover layer 25 preferably of transparent plastic film.
  • a cover layer 25 preferably of transparent plastic film.
  • Extending inside one end of the pad so. as to overlie the bottom film layer 22 is an elastic digit loop 26 which may satisfactorily be formed of commonly known woven fabric elastie ribbon having its ends secured together in any suitable manner such as by stitching or stapling to form the loop, the secured ends being inside the pad.
  • a heat seal seam 29 joins at least the films 22 and 25, and possibly the adjacent edge of the foam layers surrounding a, dome 30 formed in the top film 25 at the time the heat seal seams are established to provide a smooth slick covering over the aflliction itself.
  • the upper face of the lower die 14 is first covered with a blank of material 31 to function as a dielectric buffer, and this sheet may satisfactorily be made of polytetrafluoroethylene.
  • This sheet is merely for the protection of the dies and is immune to the heat sealing operation.
  • the sheet is apertured to fit over the guide pins 1818 and over each of the dome molding plugs 21, and this sheet may remain on the die indefinitely through numerous operations.
  • the layers that make up the finished article are stacked on top of the buffer sheet 31.
  • the layers of material making up the finished article are in the form of precut blanks of a size to fit the upper face of the lower die.
  • Each of these blanks is provided with apertures for engagement over the guide pins 1818 and also, with one exception, provided with apertures to receive the upward- 1y projecting dome plug 21.
  • Each of the blanks, with a different exception, is also shaped to provide curvate forwardly extending projections corresponding in size and location with the projection 16 on the lower die.
  • a blank 22a which ultimately forms the lower film 22 in the finished article.
  • the apertures for the dome molding plugs 21 in this film 22a are of a size to just intimately fit over the dome plug.
  • the digit loop 26 is placed in position over the projecting portion 16 of the die, as seen in FIGURES 7 and 8, and the depending sector flange 17 maintains this loop in position against sliding off the projection.
  • the loop overlies the blank 22a
  • a blank 23a of foam material overlies the film blank 22a and the digit loop 26.
  • This blank 23a is provided with an aperture 32 for each dome plug 21 that is noticeably larger than the plug so as to leave a space entirely around the plug as best seen in FIGURE 7.
  • a partial foam blank 24a is positioned, this blank having a circular notch 33 therein for each of the dome plugs 21, the notch being of the same diameter as the aperture in the first foam blank 23a.
  • the top film blank 25a is placed in position, this film having no aperture therein except those for the guide pins 1813, and this film completely overlies each of the dome plugs 21.
  • the upper die With all of the blanks so positioned, the upper die is next brought down upon the material on the lower die as shown in FIGURE 8 under pressure, and when the respective blanks have been compressed to substantially the degree shown in FIGURE 8, a charge of high frequency electrical current is passed between the dies, and a very few seconds is suificient for that current to efiect the heat seal seam 2Q occurring around the dome molding plug 21 in spaced relationship thereto and also provide the heat and tear seal seam 27 defining the bounding edge of the device.
  • the dies are shown in their posi tion at the completion of an operation in FIGURE 8, and it will be noted that the relief block 2th for each dome molding plug 21 is somewhat compressed below its origin-a1 height seen in FIGURE 5, and the relief block 13 in the upper die has also been compressed in somewhat of a dome shape.
  • This relief block in the upper die insures all of the resultant pads as being of the same thickness, while the relief block 20 permits the dome forming plug to extend upwardly sufficiently for positioning of the blanks, and then yield until it is at the proper height to form the dome 30 in the upper film 25.
  • the actual height of the finished dome may be controlled or varied by the use of a shorter or longer dome forming plug 21.
  • the film of the blank 25a is stretched cold and heat sealed at its lower edge at least to the lower film 22.
  • a permanent deformation is established in the upper film and it will retain its dome shape throughout the life of the pad.
  • the air in the foam layers 23 and 24 is squeezed out to a material extent prior to the establishment of the heat seal seams.
  • the finished pad is therefore flatter than desired by virtue of the partial vacuum inside it. Therefore it is desirable, as a final step in the method, to provide either the upper or lower film 22 or 25 with a minute perforation such as by a needle 34 as seen in FIGURE 9. This permits air to enter inside the casing formed by the two films and the foam layers expand as much as possible in the confined space, restoring the pad to the desired thickness and rendering it highly resilient and comforta ble without any danger of the foam migrating laterally under pressure points.
  • the two strips 1111 in the upper die member also eflect heat scaling for their widths, which short seams as indicated at 3535 in FIGURE 9 are substantial enlargements of the heat and tear seal seam 27 formed by the knife edge 6 of the upper die as well as the sloping portion 5 thereadjacent.
  • the bounding heat seal seam is widened at the location of the strips 11-11 directly over the digit loop.
  • the thermoplastic material of the layers is melted into the elastic digit loop.
  • the tear seal effected by the sharp edge 6, is not disturbed by way of the attachment of the band, and as indicated at 36 in FIGURE 9 waste stock may readily be torn from the finished pad directly over the band as well as elsewhere.
  • the band is not severed by the edge 6 of the top die, and this is controlled by the distance of travel of the top die.
  • the waste stock would not be broken, as appears for illustrative purposes only, but the entire waste would be removed from around the finished pad in one piece.
  • the pad is formed with a single operation of the dies, and a portion of the material making up the pad is cold stretched and given a permanent set to provide the dome 30 which overlies the afiliction.
  • the dies may be rearranged to provide a pad without a dome, but instead having an aperture entirely through the pad where the dome 30 was previously.
  • the same main dies are used, but the guide pins 18-18 and the dome forming plugs 21 have been removed from the lower die.
  • the upper die has been arranged by eliminating the auxiliary heat sealing die element 7 and substituting therefor a similarly shaped die element 37 having an inner knife edge 38, FIG- URE 11, of the same character as the knife edge 6 on the skirt 3 of the main die element defining the outline of the finished article. This substitution is easily accomplished by releasing the bolt nut assembly 8, removing the element 7, substituting the element 37, and tightening the bolt nut assembly, for each die element embodied in the upper die.
  • the blanks do not have to be apertured to fit over the pins 1818, and the only preforming necessary is to cut the blanks in plain rectangular sheets of a size to fit over the lower die. These blanks then may all be positioned by seating them snugly against the upstanding flange 15 on the lower die, as seen in FIGURE 10.
  • the same dielectric material 31 may be utilized, or an unapertured sheet of dielectric material 39, FIGURE 10, may be laid over the lower die 14.
  • a lower film 22b is placed, and in the event the toe or digit loop 26 is to be utilized, this lower film 22b will be precut to fit individually over each of the projections 16 on the lower die. In the event the digit loop is not utilized, and the pad is to be completed without it, the film blank 22b may satisfactorily be rectangular.
  • a foam blank 23b is positioned, and then a foam blank 24b of lesser width is placed on top of the larger foam blank, and finally the top film blank 25b is placed.
  • the dies are brought together in the manner seen in FIGURE 11, and upon pressure of the upper die on the lower and the charge of high frequency electrical current therethrough, not only is the heat seal seam 27 defining the outline of the pad established, but simultaneously therewith an inside heat and tear seal seam 40 is established by the die element 37, so that in the resultant pad the heat seal seam 4t) defines an open aperture, after the removal of the waste as above described.
  • a pad having a set dome-like formation to overlie the afiliction may be provided, pads with or without digit loops may be provided, a pad having a complete aperture for the reception of the afiliction may be provided, the dome shaped portion or the aperture through the device may have substantially any desired shape, and all of the pads are uniform in thickness regardless of the fact that each pad is thicker in one portion than in another.
  • Electronic heat and tear sealing dies comprising a lower die including a conductive plate having a plurality of recesses therein,
  • an upper die including a conductive plate
  • Electronic heat and tear sealing dies comprising a lower die including a conductive plate having a plurality of recesses therein,
  • a rounded projection extending forwardly on said plate opposite each said plug, a flange depending from the forward part of each said projection, and an upper die including a conductive plate a die member in the form of a depending skirt on said plate for each of the plugs in the lower die, a knife edge on each of said die members to effect a heat and tear seal seam, and an inner auxiliary die member inside said skirt in position to cooperate with one of said plugs and having a blunt working edge to effect a heat seal seam only, and opposed heat sealing strips inside and in abutment with each said skirt to widen the heat seal seam made by said, skirt inwardly thereof.
  • An electrode die comprising a conductive plate having a recess therein, and a non-conductive shaping plug in said recess having a shaping head projecting from said recess in position to cold stretch and permanently shape material thereover, and resilient relief means in said recess beneath said plug permitting the plug to yield under pressure but constantly maintaining the plug projecting above said plate with said head in said material shaping position.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Vascular Medicine (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Acyclic And Carbocyclic Compounds In Medicinal Compositions (AREA)
US19622862 1962-05-21 1962-05-21 Heat and tear sealing dies Expired - Lifetime US3244573A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
GB1051611D GB1051611A (de) 1962-05-21
US19622862 US3244573A (en) 1962-05-21 1962-05-21 Heat and tear sealing dies
DESCH33805U DE1924137U (de) 1962-05-21 1963-05-20 Vorrichtung zur herstellung von medizinischen polstern.
US45332665 US3305421A (en) 1962-05-21 1965-05-05 Method of using heat and tear sealing dies

Applications Claiming Priority (1)

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US3244573A true US3244573A (en) 1966-04-05

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GB (1) GB1051611A (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3355345A (en) * 1964-03-18 1967-11-28 Union Carbide Corp Die for dielectric heat sealing
US3437551A (en) * 1964-09-15 1969-04-08 Mobay Chemical Corp Method of bonding thermoplastic film to polyurethane foam and product
US3629035A (en) * 1966-12-19 1971-12-21 Minoru Kuroda Method of forming applique designs
US3629034A (en) * 1966-12-19 1971-12-21 Nishizawa Shoji Co Ltd Method of making an adhesive applique article
EP0013269A1 (de) * 1978-12-21 1980-07-09 Koflach Sportgeräte Gesellschaft m.b.H Verfahren zur Herstellung eines gepolsterten Schaftes bzw. Schuhuppers und Vorrichtung zur Durchführung dieses Verfahrens

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1352383A (en) * 1919-09-11 1920-09-07 Miller Rubber Co Mechanism for manufacturing rubber bathing-caps
US2401991A (en) * 1942-02-25 1946-06-11 British Insulated Cables Ltd Machine for compressing and heating electrically thermoplastic materials
US2425388A (en) * 1943-04-23 1947-08-12 Oestricher Bernard Plastic inner sole
US2478857A (en) * 1945-12-22 1949-08-09 Rca Corp Radio-frequency heating
US2587034A (en) * 1949-12-31 1952-02-26 Frank G Dobbs Heat-sealing apparatus
US2702769A (en) * 1951-08-16 1955-02-22 Edward D Andrews Method of making sponge rubber articles and product
US2878153A (en) * 1955-02-03 1959-03-17 Agricola Reg Trust Method of making mattresses, cushions, upholstery, heat and sound insulating coverings and the like
US3026233A (en) * 1959-01-07 1962-03-20 Scholl Mfg Co Inc Electronic heat sealing polyurethane foam
US3047451A (en) * 1959-12-28 1962-07-31 Gen Motors Corp Dielectric embossing process and apparatus
US3047053A (en) * 1958-06-27 1962-07-31 Pneumatic Scale Corp Container forming machine
US3088860A (en) * 1959-06-24 1963-05-07 William M Scholl Method of making a surgical pad

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1352383A (en) * 1919-09-11 1920-09-07 Miller Rubber Co Mechanism for manufacturing rubber bathing-caps
US2401991A (en) * 1942-02-25 1946-06-11 British Insulated Cables Ltd Machine for compressing and heating electrically thermoplastic materials
US2425388A (en) * 1943-04-23 1947-08-12 Oestricher Bernard Plastic inner sole
US2478857A (en) * 1945-12-22 1949-08-09 Rca Corp Radio-frequency heating
US2587034A (en) * 1949-12-31 1952-02-26 Frank G Dobbs Heat-sealing apparatus
US2702769A (en) * 1951-08-16 1955-02-22 Edward D Andrews Method of making sponge rubber articles and product
US2878153A (en) * 1955-02-03 1959-03-17 Agricola Reg Trust Method of making mattresses, cushions, upholstery, heat and sound insulating coverings and the like
US3047053A (en) * 1958-06-27 1962-07-31 Pneumatic Scale Corp Container forming machine
US3026233A (en) * 1959-01-07 1962-03-20 Scholl Mfg Co Inc Electronic heat sealing polyurethane foam
US3088860A (en) * 1959-06-24 1963-05-07 William M Scholl Method of making a surgical pad
US3047451A (en) * 1959-12-28 1962-07-31 Gen Motors Corp Dielectric embossing process and apparatus

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3355345A (en) * 1964-03-18 1967-11-28 Union Carbide Corp Die for dielectric heat sealing
US3437551A (en) * 1964-09-15 1969-04-08 Mobay Chemical Corp Method of bonding thermoplastic film to polyurethane foam and product
US3629035A (en) * 1966-12-19 1971-12-21 Minoru Kuroda Method of forming applique designs
US3629034A (en) * 1966-12-19 1971-12-21 Nishizawa Shoji Co Ltd Method of making an adhesive applique article
EP0013269A1 (de) * 1978-12-21 1980-07-09 Koflach Sportgeräte Gesellschaft m.b.H Verfahren zur Herstellung eines gepolsterten Schaftes bzw. Schuhuppers und Vorrichtung zur Durchführung dieses Verfahrens

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DE1924137U (de) 1965-09-23
GB1051611A (de) 1900-01-01

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