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
  • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
  • B29C49/42—Component parts, details or accessories; Auxiliary operations
  • B29C49/58—Blowing means
• • 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
  • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
  • B29C49/18—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor using several blowing steps
• • 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
  • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
  • B29C49/42—Component parts, details or accessories; Auxiliary operations
  • B29C49/48—Moulds
  • B29C49/4823—Moulds with incorporated heating or cooling means
• • 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
  • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
  • B29C35/16—Cooling
  • B29C2035/1658—Cooling using gas
• • 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
  • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
  • B29C49/42—Component parts, details or accessories; Auxiliary operations
  • B29C49/48—Moulds
  • B29C49/4823—Moulds with incorporated heating or cooling means
  • B29C2049/4825—Moulds with incorporated heating or cooling means for cooling moulds or mould parts
• • 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
  • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
  • B29C49/42—Component parts, details or accessories; Auxiliary operations
  • B29C49/48—Moulds
  • B29C49/4823—Moulds with incorporated heating or cooling means
  • B29C2049/4825—Moulds with incorporated heating or cooling means for cooling moulds or mould parts
  • B29C2049/4835—Moulds with incorporated heating or cooling means for cooling moulds or mould parts releasing the blowing fluid via the cooling channels of the moulds
• • 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
  • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
  • B29C49/42—Component parts, details or accessories; Auxiliary operations
  • B29C49/58—Blowing means
  • B29C2049/5827—Blowing means not touching the preform
• • 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
  • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
  • B29C49/42—Component parts, details or accessories; Auxiliary operations
  • B29C49/58—Blowing means
  • B29C2049/5862—Drive means therefore
  • B29C2049/5865—Pneumatic
• • 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
  • B29C2949/00—Indexing scheme relating to blow-moulding
  • B29C2949/07—Preforms or parisons characterised by their configuration
  • B29C2949/0715—Preforms or parisons characterised by their configuration the preform having one end closed
• • 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
  • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
  • B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
  • B29C49/06—Injection blow-moulding
• • 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
  • B29K2067/00—Use of polyesters or derivatives thereof, as moulding material

Definitions

• the present invention relates generally to the field of the manufacture of containers made of thermoplastic material such as PET or PEN by a blow molding process or stretch blow molding from a preform (such that a preform or intermediate container), and more specifically concerns improvements made to the blowing installations, using a fluid under pressure, containers from blanks of thermoplastic material whose body is enclosed in a mold of blowing and which have been previously heated in a thermal conditioning furnace, said installations comprising a nozzle comprising an end shaped to be in sealed functional relation with the neck of the blank.
• the nozzle is arranged to be movable, in all or part, axially above the blow mold between a raised position or raised position in which the nozzle is not functional (opening and closing of the mold for loading a roughing and unloading of the molded container) and a low position or blowing position in which the end of the nozzle cooperates sealingly with the neck of the blank, or with the face of the mold above which protrudes the neck of the blank and wherein said low position said nozzle is functional.
• Blowing installations are known in which the end of the nozzle, in the operative position, cooperates positively with the neck of the blank and is either abutted sealingly against the rim (edge) of the neck of the blank, or is tightly fitted in or on the neck of the blank.
• Blowing installations are also known in which the end of the nozzle is shaped like a larger bell than the neck of the blank and caps the latter by bearing against the face of the mold on which the collar of the blank protrudes (see for example the document FR 2 764 544).
• a blowing sequence normally comprises a pre-blowing phase of the blank using a fluid (generally air) at a mean pressure (for example 12 ⁇ 10 3 Pa), then a blowing phase properly.
• a fluid generally air
• a mean pressure for example 12 ⁇ 10 3 Pa
• a blowing phase properly.
• said under a high pressure for example 40 x 10 Pa
• a drawing rod usually accompanied by axial stretching mechanically by means of a drawing rod and finally an exhaust phase with evacuation of the pre-blowing / blowing air.
• control system of the exhaust by a solenoid valve adds a control complexity of the blowing process and increases the manufacturing costs of such a blowing installation.
• Document DE 100 63 553 shows an installation for blowing, using a fluid under pressure, containers from blanks, made of thermoplastic material and comprising a body and a neck.
• This installation comprises a blow mold with a molding cavity in which the body of a blank is able to be placed, said mold having an upper surface from which is able to project the neck of a blank, once the body of said blank placed in the cavity.
• the plant also comprises a blow-off head or nozzle with a shaped end to be in sealed functional relation with the neck of the projecting blank.
• the end of the nozzle is secured to means for degassing the blowing fluid, which means are bell-shaped, able to bear sealingly on the upper surface of the mold by forming an internal volume in which the blowing fluid blown under pressure in the blank relaxes after the operation of blowing the blank, that is to say during the so-called degassing operation, and it discharges outwards through an absorber member acting as a silencer.
• This installation eliminates the degassing solenoid valve and does not require the passage of the exhaust fluid through the blowing nozzle.
• the present invention makes it possible, with relatively simple means, to satisfy this requirement by using the shaping means of the containers, namely the blowing fluid.
• the installation according to the invention comprises, in addition to what has been detailed previously in connection with the state of the art, degassing means which consist of an arrangement of the mold for producing an expansion of the blowing fluid around the blowing cavity, which mold comprises a plurality of channels arranged around said blowing cavity, which channels are provided on one side, opening into the internal volume of the degassing means and, on the other side, opening into an annular channel which allows the exhaust of said blowing fluid to the atmosphere.
• said degassing means comprises a body which comprises: a substantially cylindrical central section sealingly surrounding the end of the nozzle and a substantially planar radial ring having protruding sealing means adapted to come into sealing engagement on the upper surface of the mold, thanks to which the internal volume of the degassing means, of disc shape, is delimited by said radial ring, by said sealing means and by said upper surface of the mold.
• the degassing means comprise sealing means able to bear on the upper surface of the mold, which sealing means are in the form of a sealing skirt made of an elastic material, such as rubber or polyurethane.
• the degassing means are able to be displaced axially with the aid of control means.
• control means are in the form of a cam and a roller adapted to move on said cam.
• said control means are in the form of a jack.
• the exhaust channels are regularly dug in the blow mold concentrically to the blow axis of the nozzle.
• the annular channel into which the channels open is formed in the bottom of the blow mold.
• the annular channel is connected to an exhaust duct of the blowing fluid comprising a silencer device.
• the present invention relates to a method of blowing with a fluid under pressure of containers from blanks of thermoplastic material and comprising a body and a neck, the body of said blank being adapted to being placed in a mold cavity of a blow mold belonging to a blow-molding installation, said installation also comprising a blow-molding nozzle having an end shaped to be brought into sealing functional relation with the neck of said blank projecting from the surface top of said mold, the method comprising at least the following steps of:
• the method comprises a step of forming the closed interior volume by means of a substantially planar radial crown having protruding sealing means adapted to bear tightly against the upper surface of the mold, whereby said disk-shaped internal volume is delimited by said radial ring, by said sealing means and by said upper surface of the mold
• FIG. 1 is a schematic axial sectional view of a first embodiment of a blowing installation which corresponds to the state of the art as described in DE 100 63 553 supra;
• FIG. 2 is a schematic axial sectional view of the blowing installation according to the invention.
• blade is understood to mean a hollow body that is either in the form of a preform, that is to say a substantially axial tubular element with a closed end and an open end. having the final shape of the neck of the container to be blown, or an intermediate container, that is to say a preform that has been pre-blown, but must undergo a new blowing operation.
• the blowing installation 1 shown in Figure 1 allows the blowing of containers from blanks 2 of thermoplastic material, preferably preforms previously heated in a thermal conditioning oven.
• Each blank 2 comprises a body 3 adapted to be enclosed in a cavity 4 for molding a blow mold 5, and a neck 6 adapted to project from the upper surface 7 of said mold 5.
• the installation 1 comprises a blowing nozzle 8 which comprises an end 9 (or nozzle nose) shaped to be brought into sealed functional relation with the neck 6 of the projecting blank 2, that is to say either by a direct contact of the end 9 of the nozzle 8 with the rim of the neck 6 of the blank 2 (the nozzle is then of the contacting drinking type), or by a sealed abutment of a bell surrounding the neck 6 of the blank 2 on the upper surface 7 of the mold 5.
• a blowing nozzle 8 which comprises an end 9 (or nozzle nose) shaped to be brought into sealed functional relation with the neck 6 of the projecting blank 2, that is to say either by a direct contact of the end 9 of the nozzle 8 with the rim of the neck 6 of the blank 2 (the nozzle is then of the contacting drinking type), or by a sealed abutment of a bell surrounding the neck 6 of the blank 2 on the upper surface 7 of the mold 5.
• the blowing nozzle 8 has an internal cavity 10 in which is able to move axially a rod 11 of elongation (when it is present) so as to allow the draft 2 to be stretched at the time of blowing, the downward movement of the rod 11 inside the blowing cavity 4 being synchronized with the blowing of fluid under pressure inside the blank 2 placed in the mold 5.
• the end 9 of the nozzle 8 cooperates with means 12 for degassing the blowing fluid able to bear tightly on the upper surface 7 of the mold 5 and forming an internal volume 13 in which the blowing fluid is blown under pressure in the blank 2 is able to be evacuated after the blowing operation of the blank 2. There is thus formed a closed volume 13 in which the pressurized fluid can relax, with a view to its escape. There is thus formed an intermediate exhaust of the pressurized fluid blown before its escape to the atmosphere, and which does not require the control of a solenoid valve,
• the inner volume 13 is formed at the periphery of the neck 6 projecting from the upper surface 7.
• the degassing means 12 are provided around the nozzle end 9 and are in the form of a body 14 coaxial with the X-X blowing axis of the nozzle 8.
• the degassing means 12 are in the form of a bell 15 surrounding the end 9 of the nozzle 8 and opening towards the surface 7 upper mold 5 with, at the lower end, sealing means 21.
• the degassing means 12 comprise a body 16 which comprises: a central substantially cylindrical section 17 sealingly surrounding the 9 end of the nozzle 8 and - a substantially planar radial ring 18 having means 19 for projecting sealing able to bear tightly on the upper surface 7 of the mold 5, thanks to which the internal volume 13 of the degassing means 12 is delimited by the radial crown 18, the sealing means 19 and the upper surface 7 of the mold 5; this volume 13, of discoidal shape, is similar to the envelope of a thin slab.
• the sealing means 19 project and are in the form of a sealing skirt 20 provided at the periphery of the radial crown 18 of the central body 16 of the 12 means of degassing.
• the radial ring 18 cooperates sealingly with the end 9 of the nozzle 8 and slides on the latter so as not to be contact with the upper surface 7 of the mold 5, thus making it possible to form a closed volume 13 during the sealing engagement of the sealing means 19 on this upper surface 7 of said mold 5.
• the degassing means 12 comprise sealing means 19 capable of bearing on the upper surface 7 of the mold 5.
• These sealing means 19 are in the form of a sealing ring or skirt made of a material elastic, such as rubber or polyurethane, and they allow the formation of a sealed volume 13 when sealingly engaging the sealing means 19 on the upper surface 7 of the mold 5.
• the volume 13 which is delimited by the upper surface 7 of the mold 5, the ring 18 and the skirt 20 which is attached, is in the form of disk or flat slab.
• the degassing means 12 are able to be moved axially with the aid of means 22.
• control for example in the form of a cam 23 and a roller 24 adapted to move on said cam 23, or in the form of a cylinder, not shown.
• the roller 24 may be provided at the end of a rod 25 directly attached to an outer side surface of the degassing means 12: - either on the outer lateral surface 26 of the bell 15 (see Figure 1), - either on the outer lateral surface 27 of the central section 17 (see Figure 2).
• the first embodiment represented in FIG. 1, it is provided, in order to relax and evacuate the fluid towards the atmosphere, either to form recesses in the peripheral wall of the bell 15, or to fix a device 27 of silent exhaust of air on the peripheral outer peripheral surface of the bell 15 through which air expanded in the inner volume 13 can flow and escape noiselessly to the atmosphere.
• the exhaust of the blowing air takes place in the internal volume 13 of the degassing means and in the exhaust channels 28 arranged in the mold and placed around it of the molding cavity 4.
• These channels 28 extend between the upper surface 7 of the blow mold 5 and a cavity 29 which communicates with the outside of the mold via a conduit 30. and a silencer 31.
• This cavity 29, of annular shape, is arranged in the bottom 32 of the mold and acts as a collector for the various channels 28.
• the degassed blowing fluid of the blown container is discharged from the internal volume 13 of the degassing means 12 through said exhaust ducts 28 of the blowing mold 5, which allows the same time to cool the blow mold 5, because of the expansion of the pressurized fluid in these channels 28.
• the mold 5 has indeed tend to heat up because of contacting, at the time of blowing, the hot thermoplastic material blown against the internal wall of the molding cavity 4.
• the exhaust channels 28 are provided, on one side, opening into the internal volume 13 of the degassing means 12 and, on the other side, into an annular channel 29 on which is connected a conduit 30 for exhausting the fluid blowing device comprising, at the end of said duct 30, a device 31 with a silent exhaust, of a type known per se, which makes it possible for the blowing fluid to escape towards the atmosphere after the latter has essentially expanded in the channels 28 exhaust.
• the volume 13 is arranged in such a way that it only serves as a passage duct for the blowing air between the cavity 4 and the channels 28; the expansion of the blowing air is mainly done in said channels 28.
• the exhaust channels 28 are regularly dug in the blow mold 5 concentrically with the X-X blowing axis of the nozzle 8.
• the blowing air expands between the volume 13 which is of disc shape and the annular channel 29 which is formed in the bottom 32 of the blowing mold 5.
• the present invention also relates to a method of blowing, using a fluid under pressure, containers from blanks 2 made of thermoplastic material and comprising a body 3 and a neck 6, the body 3 of said blank 2 being able to be placed in a mold cavity 4 of a blow mold 5 belonging to a blow-molding installation 1, said installation 1 also comprising a blowing nozzle 8 having an end 9 shaped to be sealing functional connection with the neck 6 of said blank 2 which protrudes from the upper surface 7 of said mold 5, which method comprises at least the following steps of:
• the method according to the invention also comprises a step of forming the closed internal volume 13 by displacement of a body 14, 16, coaxial with said blowing nozzle 8, which body comprises a substantially planar radial ring 18 having means 19 for protruding sealing able to come into sealing engagement on the upper surface 7 of the mold 5, thanks to which the internal volume of the degassing means, discoidal shape, is delimited: - by said radial ring 18, - by said means 19 d skirt-like sealing 20 and - by said upper surface 7 of the mold.

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• Engineering & Computer Science (AREA)
• Manufacturing & Machinery (AREA)
• Mechanical Engineering (AREA)
• Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)

Applications Claiming Priority (2)

Publications (1)

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Family Applications (1)

Country Status (5)

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• 2007
  • 2007-09-27 FR FR0706782A patent/FR2921582B1/fr not_active Expired - Fee Related
• 2008
  • 2008-09-25 US US12/680,229 patent/US8361377B2/en not_active Expired - Fee Related
  • 2008-09-25 WO PCT/FR2008/051715 patent/WO2009050377A2/fr not_active Ceased
  • 2008-09-25 CN CN200880112402.3A patent/CN101827699B/zh not_active Expired - Fee Related
  • 2008-09-25 EP EP08840171A patent/EP2200807A2/de not_active Withdrawn

Non-Patent Citations (1)

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