BE698809A - - Google Patents
Info
- Publication number
- BE698809A BE698809A BE698809DA BE698809A BE 698809 A BE698809 A BE 698809A BE 698809D A BE698809D A BE 698809DA BE 698809 A BE698809 A BE 698809A
- Authority
- BE
- Belgium
- Prior art keywords
- film
- heat
- welding
- films
- welded
- Prior art date
Links
- 238000000034 method Methods 0.000 claims description 17
- 238000003466 welding Methods 0.000 claims description 16
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims description 7
- 239000005977 Ethylene Substances 0.000 claims description 7
- 229920001577 copolymer Polymers 0.000 claims description 7
- 238000007789 sealing Methods 0.000 claims description 7
- -1 polyethylene Polymers 0.000 claims description 5
- 239000004698 Polyethylene Substances 0.000 claims description 4
- 229920000573 polyethylene Polymers 0.000 claims description 4
- JIGUQPWFLRLWPJ-UHFFFAOYSA-N Ethyl acrylate Chemical compound CCOC(=O)C=C JIGUQPWFLRLWPJ-UHFFFAOYSA-N 0.000 claims description 3
- PNJWIWWMYCMZRO-UHFFFAOYSA-N pent‐4‐en‐2‐one Natural products CC(=O)CC=C PNJWIWWMYCMZRO-UHFFFAOYSA-N 0.000 claims description 3
- 229920000098 polyolefin Polymers 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims 2
- 229920006300 shrink film Polymers 0.000 claims 1
- 238000010438 heat treatment Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 239000012815 thermoplastic material Substances 0.000 description 4
- 238000005304 joining Methods 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 2
- 229920002367 Polyisobutene Polymers 0.000 description 2
- 230000004927 fusion Effects 0.000 description 2
- 229920000578 graft copolymer Polymers 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 2
- 229920003002 synthetic resin Polymers 0.000 description 2
- 239000000057 synthetic resin Substances 0.000 description 2
- 229920001169 thermoplastic Polymers 0.000 description 2
- 239000004416 thermosoftening plastic Substances 0.000 description 2
- 229920006257 Heat-shrinkable film Polymers 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- ZZAGLMPBQOKGGT-UHFFFAOYSA-N [4-[4-(4-prop-2-enoyloxybutoxy)benzoyl]oxyphenyl] 4-(4-prop-2-enoyloxybutoxy)benzoate Chemical compound C1=CC(OCCCCOC(=O)C=C)=CC=C1C(=O)OC(C=C1)=CC=C1OC(=O)C1=CC=C(OCCCCOC(=O)C=C)C=C1 ZZAGLMPBQOKGGT-UHFFFAOYSA-N 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 229920001400 block copolymer Polymers 0.000 description 1
- 238000002788 crimping Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- SUPCQIBBMFXVTL-UHFFFAOYSA-N ethyl 2-methylprop-2-enoate Chemical compound CCOC(=O)C(C)=C SUPCQIBBMFXVTL-UHFFFAOYSA-N 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000005865 ionizing radiation Effects 0.000 description 1
- 229920001684 low density polyethylene Polymers 0.000 description 1
- 239000004702 low-density polyethylene Substances 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 244000144977 poultry Species 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 1
- 239000012260 resinous material Substances 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
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
- B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
-
- 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
- B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
- B29C65/24—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools characterised by the means for heating the tool
- B29C65/30—Electrical means
- B29C65/305—Electrical means involving the use of cartridge heaters
-
- 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
- B29C66/003—Protecting areas of the parts to be joined from overheating
-
- 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
-
- 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
-
- 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
- B29C66/70—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
- B29C66/836—Moving relative to and tangentially to the parts to be joined, e.g. transversely to the displacement of the parts to be joined, e.g. using a X-Y table
-
- 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
-
- 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
- B29C66/73—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
- B29C66/7377—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 amorphous, semi-crystalline or crystalline
- B29C66/73775—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 amorphous, semi-crystalline or crystalline the to-be-joined area of at least one of the parts to be joined being crystalline
- B29C66/73776—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 amorphous, semi-crystalline or crystalline the to-be-joined area of at least one of the parts to be joined being crystalline the to-be-joined areas of both parts to be joined being crystalline
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
- B29K2023/04—Polymers of ethylene
- B29K2023/06—PE, i.e. polyethylene
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
- B29K2023/04—Polymers of ethylene
- B29K2023/06—PE, i.e. polyethylene
- B29K2023/0608—PE, i.e. polyethylene characterised by its density
- B29K2023/0633—LDPE, i.e. low density polyethylene
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
- B29K2023/10—Polymers of propylene
- B29K2023/12—PP, i.e. polypropylene
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2033/00—Use of polymers of unsaturated acids or derivatives thereof as moulding material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2096/00—Use of specified macromolecular materials not provided for in a single one of main groups B29K2001/00 - B29K2095/00, as moulding material
- B29K2096/02—Graft polymers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2096/00—Use of specified macromolecular materials not provided for in a single one of main groups B29K2001/00 - B29K2095/00, as moulding material
- B29K2096/04—Block polymers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/0085—Copolymers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
- B29K2995/0037—Other properties
- B29K2995/005—Oriented
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
Description
<Desc/Clms Page number 1>
Procédé de soudure à chaud des matières thermoplastiques.
<Desc/Clms Page number 2>
La présente invention se rapporte à la soudure de film à retrait élevé et elle concerne plus en particulier un procéda perfectionné permettant de joindre des films de résines synthétiques rétractibles au moyen d'une soudure à chaud qui pormet d'obtenir une amélioration des caracté- ristiques du fils.
On réalise à partir de films de matières plasti- ques résineuses synthétiques de nombreux articles dont l'épais- seur varie entre 0,00012 et 0,025 cm. On utilise à cet ef- fet divers procédés de soudure tels que, par exemple, la couture, le collage ou le sertissage bord à bord. Toutefois, l'un des procédés les plus avantageux de jonction est la soudure à chaud dans laquelle on porte la matière thermo- plastique résineuse synthétique à une température suffisante pour provoquer la fusion en commun de deux zones de cette matière de façon à les rendre solidaires.
Pour cette soudure à chaud des films de résines synthétiques, on a déjà utilisé des techniques nombreuses et variées. En général, on soude à chaud sans difficulté une matière non orientée et non rétractible de façon à constituer une liaison de résistance convenable. On a cependant eu à faire face à des difficultés considérables avec les matières rétractibles, notamment celles que l'on façonne sous forme de tubes de façon à réaliser des capacités séparées dans le sens transversal et que l'on découpe ensuite pratiquement au voisinage des jonctions de façon à obtenir une série de sacs.
Dans de nombreux cas, en raison d'une désorien- tation de la matière plastique au voisinage des jonctions, la résistance mécanique de cette matière se trouve diminuée de façon notable et il en résulte une fermeture fragile du fait
<Desc/Clms Page number 3>
de la configuration géométrique de la jonction ou des lignes de soudure résiduelles; lorsqu'on réalise des soudures à chaud dans le sens transversal sur un tube continu de matière résineuse organique synthétique, il se produit une distension ou un rétrécissement au voisinage des soudures et ces dernières deviennent fragiles; un tel rétrécissement peut encore résulter du déplacement méca- nique du polymère sous l'effet de la pression des machoires ou des rouleaux de jonction à chaud que l'on utilise pour amener la matière thermoplastique à la température de sou- dage.
Il est particulièrement difficile de souder à chaud les polymères d'oléfine et d'obtenir des fermetures présentant une résistance mécanique maximale. Souvent, en vue de réaliser des films à retrait considérablement élevé, on soumet à un rayonnement ionisant à haute énergie du polyéthylène et du polypropylène rétractibles, des copoly- mères résineux rétractibles d'éthylène et diacide acrylique, d'éthylmétttylacrylate et d'autres monomères copolymérisables avec ces derniers ; étire ensuite ces films, on les met en forme de façon à réaliser des objets tels que des sacs, on dispose dans ces sacs un produit à emballer et l'on chauffe enfin ces sacs de façon à en provoquer un retrait qui leur fasse épouser la forme de leur contenu.
On peut citer l'em- ballage de la-volaille comme application courante de ces sacs rétractibles. Lorsqu'on soude des polymères d'oléfine irradiés, on obtient souvent une soudure de résistance mé- canique faible et peu avantageuse pour une ou plusieurs des raisons mentionnées ci-dessus.
C'est pourquoi la présente invention a pour
<Desc/Clms Page number 4>
objet l'obtention de soudures à chaud améliorées pour des films de résines thermoplastiques rétractibles à chaud par application d'un procédé du genre selon lequel on dis- pose une partie du film à souder entre les machoires d'un dispositif de soudure à chaud, on élève cette partie du film à une température suffisamment élevée pour permettre un écoulement fluide de la matière thermoplastique et une soudure du polymère, on.laisse le film subir la soudure sous l'action des machoires, puis on refroidit la partie soudée du film en-dessous de sa température thermoplastique;
selon l'invention, on réalise la préparation de la sou- dure sans la soumettre à aucune tension, on relâche la pression sur la partie soudée du film et on laisse la partie chauffée se contracter de façon à donner un joint dont l'épais- seur est au moins égale à celle des couches initiales.
La description qui va suivre en regard des dessins annexés à titre d'exemple non limitatif fera bien comprendre comment l'invention peut être mise 'en pratique.
Les figures 1 à 4 représentent schématiquement un dispositif permettant de mettre en oeuvre le procédé con- forme à l'invention dans quatre positions successives de fonctionnement.
L'appareil de soudure 10 illustré par la figure 1 comporte un socle 11 dans lequel est ménagée une gorge 12 creusée à partir de la surface de soudure 13 et à l'intérieur de laquelle est disposé un élément ou bobinage de chauffage 14; on place deux morceaux de films soudables à chaud 15 et 16 sur la surface 13 au-dessus de l'élément 14; une baguette de soudure mobile 18 se trouve disposée au voisinage de la gorge 12 et conformée de façon à pouvoir appliquer les films 15 et 16 contre l'élément 14. Un pied ou pince
19 mobile se trouve également placé à côté de la baguette 18.
<Desc/Clms Page number 5>
La figure 1 montre les couches 15 et 16 dis- posées sur la surface de soudure 13 et la baguette 18 et le pied 19 en position de retrait, c'est-à-dire éloignés de la surface 13.
La figure 2 montre la baguette 18 et le pied 19 amenés au contact des couches 15 et 16; on produit une certaine quantité de chaleur dans l'élément de chauffage 14, par exemple par application d'un courant électrique d'intensité et de tension données sur une résistance, de façon à obtenir une température suffisante pour que celle du film à souder provoque la fusion des fims 15 et 16 situés face à face sous forme d'un joint commun. On soumet les films 15 et 16 à une force dans la direction indiquée par la flèche de la figure 2, c'est-à-dire vers la baguette de soudure 18.
La figure 3 montre la baguette de soudure 18 en position de retrait alors que les couches de film sont main- tenues en position serrée à l'aide du pied 19. Le film est encore soumis à une force dans la direction de la flèche, sans être soumis à aucune tension, et on laisse refroidir le joint 20 formé.
La figure 4 montre le pied 19 en position de retrait, le joint est refroidi et les films soudés 15 et 16 sont retirés de la zone de soudure. la joint 20 a été réalisé entre deux couches de film et son épaisseur est au moins égale ou supérieure à la somme des épaisseurs des couches initiales.
Dans la mise en oeuvre de l'invention, il est avantageux d'utiliser au cours de la soudure une force de serrage d'environ 0,77 kg/cm2, cette force étant appliquée par la baguette de soudure contre l'élément de chauffage.
<Desc/Clms Page number 6>
Des pressions inférieures donnent des joints dont la résistance mécanique est inférieure à celle que l'on re- cherche . De façon avantageuse, la pression de la baguette de soudure sur l'élément de chauffage est com- prisa entre environ 4,2 et 8,75 kg/cm2.
Il est absolument essentiel à la mise en oeuvre de l'invention de serrer le film au voisinage de la zone de soudure à l'aide du pied de serrage ou d'autres organes de retenue de façon à prévenir un retrait transversal ou un retrait le long du joint. On détermine facilement la pression de serrage en disposant les épaisseurs de films voulues entre les machoires d'un dispositif analogue au mécanisme de maintien ou de serrage utilisé dans le procédé de soudure à chaud, puis en chauffant une bande étroite du film au voisinage de la partie maintenue et en réglant la pression de serrage jusqu'à ce que l'on n'ob- serve aucun retrait dans cette partie. Cette pression de serrage doit évidemment être inférieure à celle qui en- dommagerait mécaniquement le film.
A titre d'exemple supplémentaire, on façonne une série de sacs à partir d'un tube de 'polyéthylène à faible densité, irradié et orienté, aplati et présentant une lar- geur d'environ 30,6 cm, par des soudures transversales '-successives réalisées sensiblement de la façon décrite ci- dessus. L'épaisseur du film est de 0,038 mm et on le soude à l'aide d'un dispositif classique de soudure,par impulsions, modifié de façon à comporter un pied de main- tien 19. On obtient des joints résistants lorsqu'on main- tient la pression de la baguette de soudure entre 0,77 et 8,75 kg/cm, la pression du pied de serrage sur le film étant suffisante pour prévenir un retrait transversal de ce film.
<Desc/Clms Page number 7>
On obtient des résultats avantageux analogues en utilisant d'autres copolymères à retrait élevé tels que, par exemple, des copolymères d'éthylène et de propylène .comme celui qui contient ces composants dans un rapport en poids de un pour un, des copolymères à blocs intercalés d'éthylène et de propylène avec de faibles quantités de polyisobutylène, comme les copolymères à 95% en poids de polyéthylène et 5% de polyisobutylène, des copolymères d'éthylène et d'acrylate d'éthyle, comme un polymère à 93% en poids d'éthylène et
7% d'acrylate d'éthyle, et des polymères de greffe de poly- éthylène et d'acide acrylique comme les copolymères de greffe à 96% en poids d'éthylène et 4% d'acide acrylique;
le pro- , cédé conforme à l'invention permet de sceller à chaud ces copolymères de façon très avantageuse.
REVENDICATIONS.
1,- Procédé de soudure à chaud de films thermoplasti- ques résineux rétractibles à chaud entre les mâchoires d'un dispositif de soudure à chaud, caractérisé en ce qu'on maintient serré le film immédiatement au voisinage de la zone à souder par application d'une force de serrage suf- fisante pour s'opposer à un retrait dans la direction du joint tout en permettant à la partie chauffée de se contrac- ter et de se refroidir.
<Desc / Clms Page number 1>
Hot welding process for thermoplastic materials.
<Desc / Clms Page number 2>
The present invention relates to high shrinkage film welding and more particularly relates to an improved process for joining shrinkable synthetic resin films by means of heat sealing which results in improved characteristics. of the son.
Many articles varying in thickness between 0.00012 and 0.025 cm are made from films of synthetic resinous plastics. Various welding methods are used for this purpose, such as, for example, stitching, gluing or edge-to-edge crimping. However, one of the most advantageous methods of joining is heat welding in which the synthetic resinous thermoplastic material is brought to a temperature sufficient to cause the joint fusion of two zones of this material so as to make them integral. .
For this heat sealing of synthetic resin films, many and varied techniques have already been used. In general, non-oriented and non-shrinkable material is heat-welded without difficulty so as to form a suitable strength bond. However, considerable difficulties have been encountered with shrinkable materials, especially those which are shaped in the form of tubes so as to achieve separate capacities in the transverse direction and which are then cut practically in the vicinity of the junctions. so as to obtain a series of bags.
In many cases, due to disorientation of the plastic material in the vicinity of the junctions, the mechanical strength of this material is significantly reduced and a fragile closure results due to the fact.
<Desc / Clms Page number 3>
the geometric configuration of the junction or residual weld lines; when heat welds are made in the transverse direction on a continuous tube of synthetic organic resinous material, there is a distension or a shrinkage in the vicinity of the welds and the latter become brittle; such shrinkage may also result from the mechanical displacement of the polymer under the effect of the pressure of the jaws or of the hot joining rollers which are used to bring the thermoplastic material to the welding temperature.
It is particularly difficult to heat weld olefin polymers and to obtain closures having maximum mechanical strength. Often, in order to achieve considerably high shrinkage films, high energy ionizing radiation is applied to shrink polyethylene and polypropylene, shrink resinous copolymers of ethylene and diacrylic acid, ethyl methylacrylate and other monomers. copolymerizable therewith; then stretches these films, they are shaped so as to produce objects such as bags, a product is placed in these bags to be packaged and finally these bags are heated so as to cause them to shrink so that they conform to the form of their content.
Poultry packaging can be cited as a common application of such shrink bags. When welding irradiated olefin polymers, a weld of low mechanical strength and of little advantage is often obtained for one or more of the reasons mentioned above.
This is why the present invention has for
<Desc / Clms Page number 4>
object of obtaining improved heat seals for heat-shrinkable thermoplastic resin films by applying a method of the type according to which part of the film to be welded is placed between the jaws of a heat-sealing device, this part of the film is raised to a temperature high enough to allow a fluid flow of the thermoplastic material and a weld of the polymer, the film is allowed to undergo the welding under the action of the jaws, then the welded part of the film is cooled by - below its thermoplastic temperature;
according to the invention, the preparation of the weld is carried out without subjecting it to any tension, the pressure is released on the welded part of the film and the heated part is allowed to contract so as to give a joint of which the thick- sor is at least equal to that of the initial layers.
The description which will follow with reference to the accompanying drawings by way of non-limiting example will make it clear how the invention can be put into practice.
FIGS. 1 to 4 schematically represent a device making it possible to implement the method in accordance with the invention in four successive operating positions.
The welding apparatus 10 illustrated by FIG. 1 comprises a base 11 in which is formed a groove 12 hollowed out from the welding surface 13 and inside which is disposed a heating element or coil 14; two pieces of heat-sealable films 15 and 16 are placed on the surface 13 above the element 14; a movable welding rod 18 is disposed in the vicinity of the groove 12 and shaped so as to be able to apply the films 15 and 16 against the element 14. A foot or clamp
19 mobile is also placed next to the rod 18.
<Desc / Clms Page number 5>
Figure 1 shows the layers 15 and 16 arranged on the weld surface 13 and the rod 18 and the foot 19 in the withdrawn position, that is to say away from the surface 13.
FIG. 2 shows the rod 18 and the foot 19 brought into contact with the layers 15 and 16; a certain quantity of heat is produced in the heating element 14, for example by applying an electric current of given intensity and voltage to a resistance, so as to obtain a temperature sufficient for that of the film to be welded to cause the fusion of the films 15 and 16 located face to face in the form of a common joint. The films 15 and 16 are subjected to a force in the direction indicated by the arrow in Figure 2, i.e. towards the weld rod 18.
Figure 3 shows the weld rod 18 in the withdrawn position while the film layers are held in the clamped position using the foot 19. The film is still subjected to a force in the direction of the arrow, without be subjected to no tension, and the gasket formed is allowed to cool.
Figure 4 shows the foot 19 in the withdrawn position, the joint is cooled and the welded films 15 and 16 are withdrawn from the weld area. the joint 20 has been made between two layers of film and its thickness is at least equal to or greater than the sum of the thicknesses of the initial layers.
In the implementation of the invention, it is advantageous to use during the welding a clamping force of about 0.77 kg / cm2, this force being applied by the welding rod against the heating element. .
<Desc / Clms Page number 6>
Lower pressures result in gaskets with lower mechanical strength than desired. Advantageously, the pressure of the weld rod on the heating element is between about 4.2 and 8.75 kg / cm2.
It is absolutely essential to the implementation of the invention to clamp the film in the vicinity of the weld area using the clamping foot or other retaining members so as to prevent transverse shrinkage or shrinkage. along the joint. The clamping pressure is easily determined by placing the desired film thicknesses between the jaws of a device analogous to the holding or clamping mechanism used in the heat sealing process, then heating a narrow strip of film in the vicinity of the part held and adjusting the clamping pressure until no shrinkage is observed in that part. This clamping pressure must obviously be lower than that which would mechanically damage the film.
As a further example, a series of bags is fashioned from an irradiated and oriented low density polyethylene tube, flattened and having a width of about 12 inches, by transverse welds. -successives carried out substantially in the manner described above. The thickness of the film is 0.038 mm and it is welded using a conventional pulse welding device, modified to include a support foot 19. Resistant joints are obtained when hand. - holds the pressure of the welding rod between 0.77 and 8.75 kg / cm, the pressure of the clamping foot on the film being sufficient to prevent a transverse shrinkage of this film.
<Desc / Clms Page number 7>
Similar advantageous results are obtained using other high shrinkage copolymers such as, for example, ethylene and propylene copolymers, such as that which contains these components in a one to one weight ratio, block copolymers. intercalated ethylene and propylene with small amounts of polyisobutylene, such as copolymers of 95% by weight of polyethylene and 5% of polyisobutylene, copolymers of ethylene and of ethyl acrylate, such as 93% by weight of polymer ethylene weight and
7% ethyl acrylate, and graft polymers of polyethylene and acrylic acid such as 96% by weight ethylene and 4% acrylic acid graft copolymers;
the process in accordance with the invention enables these copolymers to be heat sealed in a very advantageous manner.
CLAIMS.
1, - A method of heat-sealing thermoplastic resinous heat-shrinkable films between the jaws of a heat-sealing device, characterized in that the film is kept clamped immediately in the vicinity of the zone to be welded by application of sufficient clamping force to oppose shrinkage in the direction of the joint while allowing the heated portion to contract and cool.
Claims (1)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US55208766A | 1966-05-23 | 1966-05-23 |
Publications (1)
Publication Number | Publication Date |
---|---|
BE698809A true BE698809A (en) | 1967-11-22 |
Family
ID=24203881
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
BE698809D BE698809A (en) | 1966-05-23 | 1967-05-22 |
Country Status (2)
Country | Link |
---|---|
BE (1) | BE698809A (en) |
NL (1) | NL6707035A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1998023434A1 (en) * | 1996-11-22 | 1998-06-04 | Rasmussen O B | Heat-sealing polymer films |
-
1967
- 1967-05-22 NL NL6707035A patent/NL6707035A/xx unknown
- 1967-05-22 BE BE698809D patent/BE698809A/fr unknown
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1998023434A1 (en) * | 1996-11-22 | 1998-06-04 | Rasmussen O B | Heat-sealing polymer films |
Also Published As
Publication number | Publication date |
---|---|
NL6707035A (en) | 1967-11-24 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
AU659362B1 (en) | Vertical-type filling and packaging machine | |
FR2607437A1 (en) | PROCESS FOR WELDING A THERMOPLASTIC RESIN WITH LOW DIELECTRIC LOSSES WITH HIGH-FREQUENCY WELDING APPARATUS | |
FR2464886A1 (en) | ENVELOPMENT METHOD AND APPARATUS | |
FR2578816A1 (en) | WATERPROOF PACKAGING | |
CH617140A5 (en) | ||
CH632204A5 (en) | APPARATUS FOR SEALING CLOSURES ON CONTAINERS AND METHOD FOR ACTIVATING IT. | |
FR2634415A1 (en) | THERMOPLASTIC THERMOSOUDING AND THERMOCOUPAGE DEVICE AND HORIZONTAL PACKAGING MACHINE FOR PACKAGING OBJECTS IN THERMOPLASTIC FILM COMPRISING SUCH A DEVICE | |
CH432812A (en) | Method of fixing a band around an object | |
US3334004A (en) | Apparatus for cutting and radiant heat sealing thermoplastics | |
FR2580597A1 (en) | Shock absorbing device for package and method and apparatus for manufacturing such a device | |
BE698809A (en) | ||
FR2725692A1 (en) | Method for vacuum packaging of food containers | |
CH399726A (en) | Method of welding superimposed layers of a thermoplastic film and apparatus for its implementation | |
FR2464193A1 (en) | DEVICE FOR SEALING OR WELDING PLASTIC BAGS | |
FR2964025A1 (en) | METHOD OF SOLDING A MATTRESS COVER AND SYSTEM USING THE METHOD | |
FR2526706A1 (en) | APPARATUS FOR MANUFACTURING TUBULAR SHEATHES OF PLASTIC MATERIAL FOR APPLICATION TO CONTAINERS | |
FR2500370A1 (en) | Over-moulding thermoplastic components with elastomeric component - using cyclic temperature controls to vulcanise rubber without distorting plastic | |
CA2162039A1 (en) | Radiofrequency welding electrode for multicompartiment plastic film bags intended for medical use, and produced with same | |
FR2482898A1 (en) | Ductile wire electrodes for laminating polyolefin film - to produce non:linear or endless welds using induction heating | |
NO144488B (en) | ANALOGY PROCEDURE FOR THE PREPARATION OF THERAPEUTIC ACTIVITIES 8,12-DIISOPROSTANIC ACID DERIVATIVES | |
FR2605289A1 (en) | METHOD FOR CLOSING AN END OF A TUBE AND APPARATUS FOR IMPLEMENTING SAID METHOD | |
FR2691402A1 (en) | Multilayer polymer complex intended, in particular, to constitute a heat-shrinkable envelope and process for obtaining it. | |
US3824144A (en) | Method of impulse welding layers of plastic material | |
BE1001631A5 (en) | Apparatus and method for sealing film for packaging and wrapping product packaging is in a film tel. | |
EP0629490A2 (en) | Process for manufacturing a thermofusible or thermohardenable product comprising zones sensitive to electromagnetic radiation in the microwave region and the product made |