WO2016066276A1 - Procédé permettant de chasser l'air d'ébauches aux fins de fabrication de contenants plastique remplis - Google Patents

Procédé permettant de chasser l'air d'ébauches aux fins de fabrication de contenants plastique remplis Download PDF

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Publication number
WO2016066276A1
WO2016066276A1 PCT/EP2015/002183 EP2015002183W WO2016066276A1 WO 2016066276 A1 WO2016066276 A1 WO 2016066276A1 EP 2015002183 W EP2015002183 W EP 2015002183W WO 2016066276 A1 WO2016066276 A1 WO 2016066276A1
Authority
WO
WIPO (PCT)
Prior art keywords
preform
filling
air
rod
stretch rod
Prior art date
Application number
PCT/EP2015/002183
Other languages
German (de)
English (en)
Inventor
Rolf Baumgarte
Ludwig Clüsserath
Werner Lesinski
Michael Linke
Michael Litzenberg
Niels Meyer
Original Assignee
Khs Corpoplast Gmbh
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 Khs Corpoplast Gmbh filed Critical Khs Corpoplast Gmbh
Priority to EP15816082.0A priority Critical patent/EP3212379A1/fr
Publication of WO2016066276A1 publication Critical patent/WO2016066276A1/fr

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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
    • B29C49/46—Component parts, details or accessories; Auxiliary operations characterised by using particular environment or blow fluids other than air
    • 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
    • B29C49/08—Biaxial stretching during blow-moulding
    • B29C49/10—Biaxial stretching during blow-moulding using mechanical means for prestretching
    • B29C49/12—Stretching rods
    • 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
    • B29C49/46—Component parts, details or accessories; Auxiliary operations characterised by using particular environment or blow fluids other than air
    • B29C2049/4602—Blowing fluids
    • B29C2049/465—Blowing fluids being incompressible
    • 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
    • B29C49/46—Component parts, details or accessories; Auxiliary operations characterised by using particular environment or blow fluids other than air
    • B29C2049/4602—Blowing fluids
    • B29C2049/465—Blowing fluids being incompressible
    • B29C2049/4664—Blowing fluids being incompressible staying in the final article
    • 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
    • B29C49/08—Biaxial stretching during blow-moulding
    • B29C49/10—Biaxial stretching during blow-moulding using mechanical means for prestretching
    • B29C49/12—Stretching rods
    • B29C49/121—Stretching rod configuration, e.g. geometry; Stretching rod material
    • B29C49/1215—Geometry of the stretching rod, e.g. specific stretching rod end shape
    • 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
    • B29C49/42414—Treatment of preforms, e.g. cleaning or spraying water for improved heat transfer
    • 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
    • B29C49/42414—Treatment of preforms, e.g. cleaning or spraying water for improved heat transfer
    • B29C49/42416—Purging or cleaning the preforms
    • B29C49/42418—Purging or cleaning the preforms for sterilizing
    • 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
    • B29C49/4252—Auxiliary operations prior to the blow-moulding operation not otherwise provided for

Definitions

  • the present invention relates to a method for removing the air from a preform in a method for simultaneously filling and forming containers from preforms by pressurized liquid contents.
  • containers in particular bottles, are shaped in the blow-molding process by a molding gas flowing under pressure into a preheated preforming and, in a second step, filled with a filling material, in particular a liquid filling material.
  • a filling material in particular a liquid filling material.
  • Preforms for the known methods consist of a thermoplastic, for example PET, PE or PP, and are usually produced by injection molding.
  • a preforming can be converted into a container, it is thermally conditioned, that is to say in particular heated and provided with a suitable temperature profile.
  • the body of the preform is e.g. heated to about 120 ° C and malleable, while the mouth area may reach only significantly lower temperatures, since the ⁇ preforming is held at the mouth area in the forming and filling machine and may not deform under the usual holding forces there.
  • the glass transition temperature of the commonly used thermoplastic materials, above which the material can be deformed without cracking, is about 70 ° C.
  • CONFIRMATION COPY Temperature must not be fallen below during the entire forming. Because of the high heat capacity of the liquids to be filled as compared to the mold gases used in blow molding, the preform quickly loses temperature. When filling cold liquids, such as water, a process time of less than one second is available for the forming and filling process.
  • the air present in the preform prior to the start of the forming and filling process poses a problem.
  • the process time is too short to completely displace the air from the preform, and at high pressures the air dissolves in the inflowing liquid.
  • Different gases dissolved in the liquid during the discharge of the container from the filling pressure lead to excessive foaming of the liquid and thus to product losses and contamination of the machine and filled containers.
  • the oxygen present in the air can have a negative influence on the quality of the filling material, in particular on the long-term durability.
  • This object is achieved by a method for removing air from preforms for the production of filled containers made of plastic, which is characterized in that the air is at least partially displaced from the preform before the start of the molding and filling phase.
  • the aim is to reduce the existing in the preform before the beginning of the molding and filling phase air atmosphere so far that it is without negative impact on the molding and filling process and the contents.
  • the air atmosphere must be displaced for this, depends on the individual case and the used filling material and the geometry of the preform and the molded container. Due to the increase in volume of the preform in the molding of the container, the volume of the preform is anyway only a fraction of the volume of the molded container. In particular, the contents can react more or less sensitively to oxygen, so that a more or less thorough removal of oxygen is required.
  • the skilled person can easily calculate the required degree of air displacement from the preform from the volume ratios of preform and molded container and the respective requirements of the medium with respect to maximum amounts of foreign gases.
  • the displacement of the air from a preform can be done in different ways. So the displacement can be done by blowing gas or steam.
  • gases are preferably C0 2 or inert gases, such as N 2 , at.
  • C0 2 or inert gases, such as N 2 , at.
  • N 2 as an inert gas is suitable because it is neutral to the contents and also dissolved in the product does not affect its quality.
  • a gaseous sterilant such as ozone
  • steam can also be injected into the preform, in particular under pressure.
  • water which may remain in the medium.
  • the water vapor reduces its volume approximately by a factor of 1700, so that the remaining amount of water, based on the volume of the formed bottle, is negligibly small.
  • the use of hot steam is particularly advantageous because the preform is not or not substantially cooled thereby and remains malleable. In particular, by using steam with the appropriate temperature, a reheating of the preform can be achieved, so that it remains longer malleable.
  • a vaporized chemical sterilant may be, for example, hydrogen peroxide (H 2 0 2 ) or a water-hydrogen peroxide mixture.
  • the gas flow can be induced and maintained by overpressure and / or negative pressure.
  • the air in the preform can also be made by filling in liquid, for example water or filling material, into the preform. This filling is preferably carried out without pressure and without sealing the mouth of the preform, so that the liquid filled displace the air m preform and the air can escape.
  • the water or the filling material may in particular be heated, preferably to more than 80 ° C. The optimum temperature of the introduced into the preform liquid is suitable in individual cases to choose.
  • a lower pre-filled liquid temperature is tolerable than a relatively long pre-fill to form cycle where significant preform cooling is achieved by the preform pressureless filled liquid is usually undesirable.
  • the described expulsion or displacement of air from the preform occurs prior to insertion of the preform into a forming station in which the preform is subsequently formed into a container.
  • the displacement of the air can also take place only after the preform has been inserted into the forming station. This has the advantage that the time between displacement of the air and forming the Vorforlings minimized and thus disturbing changes in the temperature profile in the preform are avoided by the gaseous or liquid displacement medium.
  • the air contained in the preform can be achieved at least in part by the introduction of a stretch rod in the preform.
  • a stretch rod is used in most forming and filling processes for the axial stretching of the preform.
  • the Gregutzussel can be done via the stretch rod or through the annular gap between the container mouth and stretch rod or a combination of both.
  • the stretch rod can be advantageously designed to maximize the volume of air it displaces.
  • a hollow stretch rod may be used to discharge displacer media such as steam, C0 2 , water, or bulk material at a controlled height, for example at the bottom of the preform, into the preform, or the escaping air appropriate amount.
  • displacer media such as steam, C0 2 , water, or bulk material at a controlled height, for example at the bottom of the preform, into the preform, or the escaping air appropriate amount.
  • the preform is usually not sealed, so that the displaced air can escape.
  • a hollow stretch rod may be used to introduce the fill used to convert the preform into the container into the preform.
  • the preform is previously sealed in order to build up the required internal pressure can.
  • a particular advantage is obtained when the displacement medium used is C0 2 , which is filled into the preform through a hollow stretching rod. After forming during which the previously filled C0 2 is dissolved in the filling due to the high molding pressure, and before relieving the interior of the molded and filled container, more C0 2 can be tracked, in particular on the hollow stretch rod to carbonize the contents, ie to solve a predetermined amount of C0 2 in the contents.
  • the stretching rod can preferably be designed to be large-volume or with a large outside diameter, in an extreme case such that its outside diameter corresponds approximately to the inside diameter of a preform.
  • Inside the Medgutkanal may have the minimum diameter which is required for filling and / or be closed by a valve disposed immediately in front of the Greinlass.
  • the stretch rod should otherwise be solid, so that a maximum of air is displaced from the preform.
  • the outside diameter of the stretching rod in this area should be reduced to such an extent that the area of the annular gap is sufficient for a sufficiently fast filling material supply.
  • the stretching rod may be provided with provisions for temporarily increasing its volume, e.g. an inflatable balloon on its outside.
  • the balloon may be briefly inflated, thereby expanding toward the inner wall of the preform, or even against the inner wall of the preform, thus largely displacing the air in the preform.
  • the balloon is re-applied to the stretching rod.
  • the displaced air can not mix with the contents and not dissolve in it.
  • the stretch rod can also have a sliding, thick-walled sleeve.
  • the sleeve can be slid over the stretch rod to fill the preform as much as possible.
  • the filling of the preform with filling material can be done for example by the stretch rod.
  • the sliding sleeve can be withdrawn in the course of the molding and filling of the stretch rod up through the container mouth, so that the full volume of the contents is available.
  • the stretch rod may move downwardly out of the sleeve as the parison is stretched axially.
  • the stretching rod is removed together with the sleeve from the molded and filled container and the sleeve is moved back into the front part of the stretch rod to displace as much air in the next preform.
  • a stretching rod for use in a plant for molding and filling of containers Preforms in a mold by supplying liquid under pressure under pressure, which is characterized in that it has a variable volume.
  • the stretch rod may have at least one inflatable chamber bounded by an elastic membrane.
  • the stretch rod may have in its interior an air channel through which air can be supplied to the chamber and the balloon can be inflated.
  • the stretch rod may thus temporarily assume an increased volume and displace the air present in the preform, if it is introduced into the preform.
  • the stretch rod can also have a fixed volume, wherein it can have at least one section in which the diameter of the stretch rod corresponds approximately to the inner diameter of a preform.
  • the volume of air displaced in the preform is therefore particularly large.
  • the diameter of the stretch rod in the area above this section is significantly smaller than the inner diameter of a preform, so that in the case of Bigutzussel through the annular gap between the stretch rod and the mouth of the preform sufficient space remains to allow sufficient volume flow of the medium.
  • Fig. 1 shows schematically the displacement of air in the preform by steam
  • Fig. 2 shows schematically the partial displacement of air in the preform by an inflatable stretching rod
  • Fig. 3 shows schematically the partial displacement of air in the preform by a volume-optimized stretching rod
  • Fig. 4 shows schematically the displacement of air in the preform by steam with additional use of a stretching rod; shows schematically the displacement of air in the preform by filling hot water in the preform with additional use of a stretch rod.
  • Figure 1 shows in section a preform 1, on which the forming and filling head 2 of a machine for simultaneous molding and filling of bottles of preforms made of a thermoplastic material is sealingly placed.
  • the preform 1 was first thermally conditioned, wherein the body 3 is heated to a temperature at which the preform is plastically deformable, while the mouth region 4 of the preform was heated only to a temperature which still leaves it enough stability to allow the thread 5 is not deformed in the formation of the container and the preform below or above the collar 6 held by the holding elements of a machine and can be transported through the machine.
  • the forming and filling head 2 has a stretching rod 7, which can be inserted into the preform at the beginning of the molding and filling process to assist the axial stretching.
  • the forming and filling head 2 further has an inlet 8 for gas or steam. Opposite is an outlet 9.
  • steam is injected at a temperature of about 120 ° C under slight overpressure in the preform 1 before the start of the molding and filling phase through the inlet 8.
  • the illustrated arrows illustrate the incoming flow, with which the air contained in the preform 1 is displaced from the preform.
  • the air flows out of the outlet 9.
  • the atmosphere in the preform then consists mainly of water vapor.
  • the pressure of the injected water vapor should be chosen so that it is insufficient to trigger the stretching process, but high enough to ensure a rapid displacement of the preform air within the available process time.
  • the stretch rod 7 can be driven into the preform during the blowing of the water vapor.
  • the hot steam has the advantage that the preform 1, whose body 3 is preheated to about 120 ° C, depending on the material of the preform, in order to be thermoplastically deformable, is not cooled. If necessary, additional heating can be achieved by the hot steam.
  • the available process time for the forming of the bottle is thus optimized.
  • the air from the preform 1 is largely displaced by this method and remains only so small proportions in the preform that they can not cause deterioration of the contents and can not hinder the molding and filling process.
  • the water vapor condenses to water.
  • the volume is reduced by a factor of 1700, so that the remaining water content in the medium is negligible. If necessary, it can be calculated and the concentration of the contents corrected accordingly, e.g. a product with water and syrup content is processed.
  • vapors or gases can be processed, such as C0 2 , N 2 or gaseous or vaporized sterilants.
  • Figure 2 shows schematically the partial displacement of air in the preform 1 by an inflatable stretch rod 7 in section.
  • the stretch rod 7 is moved into the preform 1 before the beginning of the molding and filling phase and already displaces some of the air in the preform 1.
  • an elastic membrane 10 is arranged on the stretch rod 7 on the stretch rod 7, so that the membrane 10 can inflate balloon-shaped. This allows the stretch rod 7 displace a significantly increased volume of air within the preform 1.
  • the shaping and filling process can then take place in the usual way by filling material supply through the stretching rod and / or the annular gap 12 between the mouth 13 of the preform and the stretching rod 7.
  • the membrane 10 rests against the stretching rod 7 again under the pressure of the inflowing filling material and releases the displaced volume for filling material.
  • FIG. 3 schematically shows the partial displacement of air in preforming by a volume-optimized stretching rod 7.
  • the stretching rod has an area 14 with an enlarged diameter which corresponds approximately to the inside diameter of the preform 1.
  • the stretch rod 7 displaces thereby in its introduction into the preforming 1 largely the air therein. If the stretching rod 7 is completely inserted into the preforming 1, its diameter in the region of the mouth 13 of the preform is reduced relative to the region below in order to release a sufficiently large annular gap 12, so that the shaping and filling of the container can take place with a sufficiently large flow of product ,
  • the enlarged portion 14 of the stretch rod 7 shown in this figure begins in the region of the preform, which is pressed by radial stretching outwardly to the wall of the mold, not shown here. Thus, immediately enough filling material can be supplied at the beginning of the filling.
  • FIG. 4 shows the displacement of the air in preform 1 by steam as in FIG. 1 and additionally by a stretching rod.
  • Figure 5 shows schematically the displacement of air in the preform 1 by filling hot water in the preform with additional use of a stretch rod 7.
  • a preform 1 hot water at a temperature between 80 ° C and 90 ° C is filled in a first step , The filling level is chosen so that after introduction of the stretching rod 7, the water level 20 is in the region of the mouth 13 of the preform 1. The previously located in the preform 1 air is thus almost completely displaced.

Abstract

La présente invention concerne un procédé permettant de chasser l'air d'une ébauche lors d'un procédé permettant de simultanément remplir et mettre en forme des contenants à partir d'ébauches par l'intermédiaire d'un produit de remplissage liquide cédé sous pression. La présente invention a pour but de proposer un procédé permettant de chasser au moins partiellement l'air d'une ébauche avant l'amorce de la phase de mise en forme et de remplissage. A cet effet, un procédé d'évacuation de l'air de l'ébauche (1) aux fins de fabrication de contenants plastique remplis, est caractérisé en ce que l'air est au moins partiellement refoulé de l'ébauche (1) avant l'amorce de la phase de mise en forme et de remplissage.
PCT/EP2015/002183 2014-10-30 2015-10-30 Procédé permettant de chasser l'air d'ébauches aux fins de fabrication de contenants plastique remplis WO2016066276A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP15816082.0A EP3212379A1 (fr) 2014-10-30 2015-10-30 Procédé permettant de chasser l'air d'ébauches aux fins de fabrication de contenants plastique remplis

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014016140.4A DE102014016140A1 (de) 2014-10-30 2014-10-30 Verfahren zur Entfernung von Luft aus Vorformlingen zur Herstellung von gefüllten Behältern aus Kunststoff
DE102014016140.4 2014-10-30

Publications (1)

Publication Number Publication Date
WO2016066276A1 true WO2016066276A1 (fr) 2016-05-06

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PCT/EP2015/002183 WO2016066276A1 (fr) 2014-10-30 2015-10-30 Procédé permettant de chasser l'air d'ébauches aux fins de fabrication de contenants plastique remplis

Country Status (3)

Country Link
EP (1) EP3212379A1 (fr)
DE (1) DE102014016140A1 (fr)
WO (1) WO2016066276A1 (fr)

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CN111372751A (zh) * 2017-11-30 2020-07-03 株式会社吉野工业所 液体吹塑成型方法
CN111372752A (zh) * 2017-11-29 2020-07-03 株式会社吉野工业所 液体吹塑成型方法
CN111417503A (zh) * 2017-11-27 2020-07-14 株式会社吉野工业所 液体吹塑成型方法
US11648724B2 (en) * 2017-05-30 2023-05-16 Yoshino Kogyosho Co., Ltd. Liquid container manufacturing method

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DE102017120812A1 (de) * 2017-09-08 2019-03-14 Khs Corpoplast Gmbh Formfüllstation

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11648724B2 (en) * 2017-05-30 2023-05-16 Yoshino Kogyosho Co., Ltd. Liquid container manufacturing method
CN111417503A (zh) * 2017-11-27 2020-07-14 株式会社吉野工业所 液体吹塑成型方法
US11318656B2 (en) 2017-11-27 2022-05-03 Yoshino Kogyosho Co., Ltd. Liquid blow molding method
CN111372752A (zh) * 2017-11-29 2020-07-03 株式会社吉野工业所 液体吹塑成型方法
US11400637B2 (en) * 2017-11-29 2022-08-02 Yoshino Kogyosho Co., Ltd. Liquid blow molding method
EP3718739B1 (fr) * 2017-11-29 2023-06-28 Yoshino Kogyosho Co., Ltd. Procédé de moulage par soufflage de liquide
CN111372751A (zh) * 2017-11-30 2020-07-03 株式会社吉野工业所 液体吹塑成型方法

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Publication number Publication date
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EP3212379A1 (fr) 2017-09-06

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