EP0574472A1 - Procede et dispositif pour la fabrication de corps creux formes par soufflage - Google Patents

Procede et dispositif pour la fabrication de corps creux formes par soufflage

Info

Publication number
EP0574472A1
EP0574472A1 EP92906020A EP92906020A EP0574472A1 EP 0574472 A1 EP0574472 A1 EP 0574472A1 EP 92906020 A EP92906020 A EP 92906020A EP 92906020 A EP92906020 A EP 92906020A EP 0574472 A1 EP0574472 A1 EP 0574472A1
Authority
EP
European Patent Office
Prior art keywords
wall
preform
mold
heated
region
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.)
Withdrawn
Application number
EP92906020A
Other languages
German (de)
English (en)
Inventor
Rainer Wild
Michael Mukrowsky
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.)
Rudolf Wild GmbH and Co KG
Original Assignee
Rudolf Wild GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Rudolf Wild GmbH and Co KG filed Critical Rudolf Wild GmbH and Co KG
Publication of EP0574472A1 publication Critical patent/EP0574472A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/72—Heating or cooling
    • B29C45/73—Heating or cooling of the mould
    • 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
    • B29C49/64—Heating or cooling preforms, parisons or blown articles
    • B29C49/6409—Thermal conditioning of preforms
    • B29C49/6436—Thermal conditioning of preforms characterised by temperature differential
    • B29C49/6445—Thermal conditioning of preforms characterised by temperature differential through the preform length
    • 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
    • B29C49/64—Heating or cooling preforms, parisons or blown articles
    • B29C49/68—Ovens specially adapted for heating preforms or parisons
    • 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
    • B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • B29C35/08—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation
    • B29C35/0805—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation
    • B29C2035/0822—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation using IR radiation
    • 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
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/07—Preforms or parisons characterised by their configuration
    • B29C2949/081—Specified dimensions, e.g. values or ranges
    • B29C2949/0811—Wall thickness
    • B29C2949/0813—Wall thickness of the neck
    • 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
    • B29C2949/081—Specified dimensions, e.g. values or ranges
    • B29C2949/0811—Wall thickness
    • B29C2949/0816—Wall thickness of the flange
    • 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
    • B29C2949/081—Specified dimensions, e.g. values or ranges
    • B29C2949/0811—Wall thickness
    • B29C2949/0817—Wall thickness of the body
    • 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
    • B29C2949/081—Specified dimensions, e.g. values or ranges
    • B29C2949/082—Diameter
    • B29C2949/0822—Diameter of the neck
    • 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
    • B29C2949/081—Specified dimensions, e.g. values or ranges
    • B29C2949/082—Diameter
    • B29C2949/0825—Diameter of the flange
    • 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
    • B29C2949/081—Specified dimensions, e.g. values or ranges
    • B29C2949/082—Diameter
    • B29C2949/0826—Diameter of the body
    • 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
    • B29C2949/081—Specified dimensions, e.g. values or ranges
    • B29C2949/0829—Height, length
    • 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
    • B29C2949/081—Specified dimensions, e.g. values or ranges
    • B29C2949/0829—Height, length
    • B29C2949/0831—Height, length of the neck
    • 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
    • B29C2949/081—Specified dimensions, e.g. values or ranges
    • B29C2949/0829—Height, length
    • B29C2949/0835—Height, length of the body
    • 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
    • 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
    • B29K2105/25—Solid
    • B29K2105/253—Preform

Definitions

  • the invention relates to a method for producing blow-molded hollow bodies of the type explained in the preamble of claim 1, and to an apparatus for carrying out this method according to claim 10.
  • Such a method is known from EP-A-197 780.
  • This known method is intended to produce screw-top bottles that can be filled with hot liquids.
  • that area of the wall of the preform is additionally heated which in the finished bottle is between the upper end of the bottle shoulder and above that extends the top of the bottle neck.
  • This area has a homogeneous degree of stretching. The heating should take place in such a way that the additionally heated area becomes milky.
  • the finished hollow body is cooled in that the liquid to be stored is already cooled down to 0 ° and introduced into the hollow body while it is still in the blow mold.
  • the known method only for the production of Disposable containers is designed because multiple filling was not considered.
  • the invention has for its object to provide a method and an apparatus for producing hollow bodies with which reusable containers can also be produced.
  • the object is achieved in a method by the features specified in claim 1 and in a device by the features specified in claim 10.
  • Reusable containers Compared to single-use containers, returnable containers have to meet a number of additional requirements.
  • Reusable containers must have a reduced tendency to stress corrosion cracking in addition to sufficient mechanical strength when filled and when empty. You must survive at least 20 cleaning processes with hot cleaning fluids and, if necessary, disinfectants. They must not shrink too much in the course of multiple use, and must also have an absorption volume that is within the legally prescribed limits even in the last step of use. They must also be able to be repeatedly filled in conventional filling systems, these filling systems, for example, gripping bottles below a bead arranged near the filling opening on the bottle neck and pressing them against a filling lance or the like. Disposable containers cannot meet these requirements.
  • the hollow bodies produced by the method according to the invention meet all the requirements placed on reusable containers. For example, in the case of a hollow body produced according to the invention with a volume of 1 liter, a shrinkage of only 0.4% by volume was found even after 30 to 35 cleaning steps at a relatively high cleaning temperature of 65 ° C.-67 ° C.
  • the method according to the invention can also be used to produce thick-walled hollow bodies.
  • Claim 2 describes a particularly preferred temperature range for the additional heating. It was found that, in particular in the case of an additional heating arranged in the upper region of the conditioning mold, it is often sufficient to replace the otherwise unavoidable heat losses when preheating the preform. However, the additionally heated area is preferably brought above the temperature of the remaining wall of the preform.
  • Claim 8 describes a particularly useful temperature for the blow molding and thermosetting.
  • the method according to the invention is preferably carried out in one step, the preform being continuous from casting to conditioning to blow molding, i. H. without intermediate storage.
  • Claim 15 describes a particularly preferred mold for injection molding the preform, with which an extremely uniform and rapid cooling can be achieved over the wall of the preform.
  • Claims 16 and 17 describe a form of conditioning with which the wall temperature of the preform can be influenced even further in a targeted manner.
  • FIG. 1 shows a schematic, partially sectioned illustration of the casting mold modified according to the invention
  • FIG. 2 is a schematic representation of the conditioning form modified according to the invention.
  • Figure 3 is a schematic representation of the blow mold used according to the invention.
  • a preform is first injection molded.
  • the injection molding takes place in a cooled injection mold, the inner wall of which is the shape of the
  • the outer wall of the preform is determined, while a cooling lance, which is inserted into the interior of the injection mold, forms the inner surface of the preform.
  • the preform is cooled in the injection mold from the molding temperature to the extent that it solidifies and can be removed from the mold.
  • the preform is then inserted, if necessary after further preheating, into a heated blow mold, the inner wall of which corresponds to the desired outer shape of the bottle.
  • a stretching mandrel is first inserted into the interior of the preform, which supports the axial expansion of the preform.
  • Pressurized gas preferably compressed air
  • This stretching process brings the material of the wall from the amorphous state to a biaxially oriented state.
  • a thermosetting takes place, through which the material of the wall changes into a crystalline state. After cooling, the finished bottle can then be removed from the mold.
  • the present invention is intended to modify this known method in such a way that it is suitable for producing reusable containers.
  • the injection mold 1 shown in FIG. 1 is used for the method according to the invention.
  • the inside of the injection mold 1 has a mold cavity 2 which is open at the top and is surrounded by a wall 3.
  • the mold 1 is covered on the outside by an insulating material 4.
  • a longitudinal rib 8 which delimits each cooling compartment 7 in the circumferential direction.
  • passage openings 9 are provided in the circumferential ribs 6, through which the cooling medium can pass from one cooling compartment into the adjacent cooling compartment.
  • the passage openings 9 of adjacent cooling compartments are arranged on opposite sides of the longitudinal rib 8, so that the cooling medium can enter each cooling compartment 7.
  • the coolant enters the cooling compartments 7 through an opening 10 in the lower part of the casting mold 1 and leaves them in the upper region of the casting mold through an opening which is not visible in the drawing.
  • the casting mold 1 has relatively thin circumferential ribs 6, which consist of a good heat-conducting material, in particular copper.
  • the contact area of the coolant with the peripheral wall 3 is greatly increased, which improves the heat transfer into the coolant.
  • several inlet or outlet openings 10 can be provided for the coolant over the height of the casting mold 1, so that the cooling effect in the upper region of the casting mold, where the coolant already absorbs heat in conventional casting molds has been further improved.
  • a cooling lance (not shown) for cooling the inner wall of the preform is introduced into the interior of the injection mold in a known manner.
  • the coolant is water at 12 to 14 ° C.
  • the cooling time takes 4 to 14 seconds, preferably 12 seconds.
  • the preform sprayed at 270 ° C is cooled to a temperature of approximately 90 to 95 ° C.
  • the particularly uniform cooling is achieved by the special design of the coolant channels described above. At each entry from one cooling compartment to the other, a back pressure is generated which causes turbulence in the flow. This creates a swirl of different temperature ranges and therefore more uniform cooling. This uniform cooling significantly simplifies the manufacturing process of reusable containers in the subsequent blowing process.
  • the 90 to 95 ° C. warm preform 11 is inserted into the conditioning mold 12 shown schematically in FIG. 2, which is preferably located on the same machine unit as the mold, so that intermediate storage of the preform is not necessary.
  • the preform 11 is shaped and dimensioned for producing a bottle.
  • the preform 11 has a first region 11a, which forms the bottle neck for screwing on a closure.
  • the area 11a already has the most important dimensions, ie the diameter, the wall thickness and the height, of the finished bottle neck.
  • the area 11a is delimited by an outwardly projecting bead 11b. This bead 11b later serves to grip the finished bottle in a filling system.
  • transition area 11c which in the finished Bottle forms the transition area between the narrow bottle neck, which remains essentially in the amorphous state, and the wide, biaxially oriented bottle body.
  • the preform 11 has a continuously increasing wall thickness in this area 11c.
  • a region 11c adjoins the region 11c, which forms the later bottle body and which has a constant wall thickness in the preform which is enlarged compared to the bottle neck 11a.
  • the area lld is cylindrical and is closed at the bottom by a base area lle.
  • the bottom region III has rounded transitions to the cylindrical region IIId, but has a smaller wall thickness in the preform.
  • a preferred preform has the following preferred dimensions: area 11a - length about 17mm, wall thickness about 2.5mm, inner diameter about 20mm; Area 11b - outside diameter about 37mm, thickness about 6mm; Area 11c - wall thickness increasing from approximately 3mm to approximately 6mm, inner diameter decreasing from approximately 20mm to approximately 17.5mm with transition radius RIO, outer diameter increasing from approximately 26mm to approximately 29.5mm with transition radius R30, length approximately 23mm; Area lld - wall thickness about 6mm, length about 108mm, outer diameter about 29.5mm; Area lle - wall thickness falling from about 6mm to about 3mm, transition radius outside R9, transition radius inside R5.8, height about 6mm; Overall length of the preform about 160mm.
  • the preform 11 is clamped in the conditioning mold 12 above the bead 11b in the usual way.
  • the conditioning mold 12 has three heating zones 12a, 12b and 12c, the lower heating zone 12a having a temperature of preferably approximately 70 °, which is directed upwards to the lower one
  • the central heating zone 12b adjoining the heating zone 12a preferably reaches a temperature of approximately 90 ° and the upper heating zone 12c adjoining the heating zone 12b upwards preferably reaches a temperature of approximately 70 °.
  • the heating zones 12a to 12c are located essentially next to the bottom region III and the cylindrical region IIId of the preform 11.
  • the heating zones 12a to 12c are heated in the usual way, for example by circulating, heated oil.
  • the conditioning mold 12 contains an additional heater 13, which is preferably designed as an infrared heater.
  • the additional heater irradiates the area 11c below the bead 11b, i. H. the area which, in the finished bottle, lies in the transition between the amorphous neck area 11a, which remains essentially undrawn, and the area lld for the later bottle body, which area has to be drawn biaxially.
  • the auxiliary heater is operated in such a way that a temperature of approx. 170 ° C. is reached in the region 11c without the preform crystallizing in this region.
  • the preform 11 is inserted from the conditioning mold 12 into a blow mold 14 shown in FIG.
  • the blow mold 14 has in the usual way an inner cavity 15 corresponding to the outline shape of the finished bottle and a wall 17 which can be heated by means of an oil circuit 16 which is only indicated.
  • a stretching mandrel 18 is located in the interior of the preform 11.
  • an inlet line 19 is provided for introducing compressed air into the interior of the preform 11.
  • the preform 11 is clamped in the blow mold 14 in such a way that the regions 11c, 11d, 11b located below the bead 11b protrude into the mold cavity 15.
  • the stretching mandrel 18 is first moved further into the mold cavity 15 while the preform 11 is stretched.
  • compressed air of approx. 30 bar is blown in via the line 19, which also presses the wall of the preform 11 in the radial direction against the wall of the mold cavity 15.
  • the greatest stretching of the material takes place in the area of the cylindrical wall area lld of the preform 11, while the bottom area 11c, in particular in the vicinity of the vertical central axis, and the clamped neck area 11a are stretched less or not at all.
  • the area 11a in particular remains amorphous.
  • the region 11c just below the bead 11b would also remain in an amorphous state.
  • the heat treatment ensures that the entire area 11c is oriented biaxially to such an extent that a sufficient crystalline structure is also formed in this area during subsequent thermosetting due to the contact of the plastic material with the wall of the mold cavity 15 preheated to 140 ° C. without that the shape or the appearance of the bottle so produced is impaired.
  • cooling air at 25 bar is passed through the inside of the finished bottle in a continuous process (through small holes in the stretching lance) and then the finished bottle out of the mold taken.
  • the method according to the invention can also be modified for other plastics or other hollow body shapes. Additional heaters can be provided at all critical transition points, especially on the floor. Another heat treatment process can follow blow molding.

Landscapes

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

Abstract

Il est décrit un procédé et un dispositif pour la fabrication de corps creux (11) formés par soufflage, en matière plastique, notamment en PET. Une préforme creuse coulée (11) est introduite, à l'état chauffé, dans une matrice de soufflage chauffée (14), et est amenée, par étirage du matériau constituant sa paroi, à prendre la forme voulue d'un corps creux, la paroi étant soumise, en fonction de la forme voulue du corps creux, à des degrés d'étirage divers suivant les zones. Afin de modifier un tel procédé et un tel dispositif pour la production de corps creux réutilisables, il est proposé, qu'avant le formage par soufflage, des zones de transition (11c) de la paroi de la préforme soient chauffées complémentairement au moyen d'un chauffage auxiliaire (13), entre des zones de paroi de divers degrés d'étirement, en particulier entre une zone de paroi à ne pas étirer ou à étirer moins fortement, et une zone de paroi à étirer plus fortement.
EP92906020A 1991-03-05 1992-03-05 Procede et dispositif pour la fabrication de corps creux formes par soufflage Withdrawn EP0574472A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4107011A DE4107011A1 (de) 1991-03-05 1991-03-05 Verfahren und vorrichtung zum herstellen blasgeformter hohlkoerper
DE4107011 1991-03-05

Publications (1)

Publication Number Publication Date
EP0574472A1 true EP0574472A1 (fr) 1993-12-22

Family

ID=6426522

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92906020A Withdrawn EP0574472A1 (fr) 1991-03-05 1992-03-05 Procede et dispositif pour la fabrication de corps creux formes par soufflage

Country Status (5)

Country Link
EP (1) EP0574472A1 (fr)
AU (1) AU1349092A (fr)
DE (1) DE4107011A1 (fr)
HU (1) HUT67122A (fr)
WO (1) WO1992015442A1 (fr)

Cited By (2)

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Publication number Priority date Publication date Assignee Title
US11560250B2 (en) 2006-03-06 2023-01-24 Plastipak Packaging, Inc. Lightweight plastic container and preform
US11780634B2 (en) 2007-05-16 2023-10-10 Plastipak Packaging, Inc. Lightweight plastic container and preform

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DE102009025839A1 (de) 2009-05-19 2010-11-25 Krones Ag Verfahren und Temperiervorrichtung zur Erwärmung von Vorformlingen vor deren Umformung zu Behältern

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See references of WO9215442A1 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11560250B2 (en) 2006-03-06 2023-01-24 Plastipak Packaging, Inc. Lightweight plastic container and preform
US11834222B2 (en) 2006-03-06 2023-12-05 Plastipak Packaging, Inc. Lightweight plastic container and preform
US11780634B2 (en) 2007-05-16 2023-10-10 Plastipak Packaging, Inc. Lightweight plastic container and preform
US11939104B2 (en) 2007-05-16 2024-03-26 Plastipak Packaging, Inc. Lightweight plastic container and preform

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Publication number Publication date
DE4107011A1 (de) 1992-09-10
WO1992015442A1 (fr) 1992-09-17
HU9302506D0 (en) 1994-03-28
AU1349092A (en) 1992-10-06
HUT67122A (en) 1995-02-28

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