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WO2006091068A1 - Dispositif de decoupe pour des preformes de recipients en plastique - Google Patents

Dispositif de decoupe pour des preformes de recipients en plastique Download PDF

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Publication number
WO2006091068A1
WO2006091068A1 PCT/NL2006/000001 NL2006000001W WO2006091068A1 WO 2006091068 A1 WO2006091068 A1 WO 2006091068A1 NL 2006000001 W NL2006000001 W NL 2006000001W WO 2006091068 A1 WO2006091068 A1 WO 2006091068A1
Authority
WO
WIPO (PCT)
Prior art keywords
cutting
preform
cutting device
positioning means
groove
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.)
Ceased
Application number
PCT/NL2006/000001
Other languages
English (en)
Inventor
Thomas Gerardus Maria Jacobs
Louwrens Johannes Van Eijk
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.)
Stork Food and Dairy Systems BV
Original Assignee
Stork Food and Dairy Systems BV
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 Stork Food and Dairy Systems BV filed Critical Stork Food and Dairy Systems BV
Priority to EP06700250A priority Critical patent/EP1841587A1/fr
Publication of WO2006091068A1 publication Critical patent/WO2006091068A1/fr
Anticipated expiration legal-status Critical
Ceased 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
    • 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
    • B29C49/72—Deflashing outside the mould
    • B29C49/74—Deflashing the neck portion
    • 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
    • B29C49/42—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
    • B29C2049/4673—Environments
    • B29C2049/4679—Sterile gas to surround or flush parts of the blow-moulding apparatus, e.g. blowing means, preforms or parisons

Definitions

  • the invention relates to a cutting device for preforms for plastic containers which are intended to hold a medium.
  • These preforms are preforms for containers, for example bottles or other types of containers, which during production are moulded with a superfluous part which needs to be cut off.
  • Cutting devices of this type are known, for example, for automatically cutting off a superfluous top part which has formed during blow-moulding of a preform for a container, in order to make the container suitable for further use, for example for the container to be filled with a liquid medium and then a lid, cap, cover or the like to be fitted to the container.
  • both cutting devices in which a blade with a cutting action is pressed onto a preform for a container which is held clamped in place and is moved around the preform, as well as in which during cutting the preform is pressed onto a stationary blade and the preform itself is rotated, are known.
  • the known cutting devices comprise positioning means which during cutting bear against the preform.
  • a cutting device according to the preamble of claim 1 is known from US 2003/0188620.
  • the device comprises a plurality of centring fingers connected to a stator and a blade which is provided at one end of a pivot arm and is connected to a rotor.
  • the centring fingers are provided around an opening which can be lowered over a top part, which is to be cut off, of a preform for a plastic bottle which has been formed by blow- moulding.
  • the centring fingers are designed such that they can move in the radial direction.
  • centring fingers are positioned above the blade, in order in this way to be able to engage on the superfluous top part which is to be cut off and to position the blade with respect to an intended cutting line on the preform.
  • the blade is moved around the circumference of the preform as a result of the rotor being driven.
  • Drawbacks of this arrangement are that the cutting device is of relatively complex construction and that the cut obtained after the top part has been cut off leaves something to be desired with regard to position, shape and quality.
  • the latter problem partly arises on account of the fact that the centring fingers engage on the superfluous top part, the shape of which is not always constant on account of blow-moulding.
  • the preforms for the bottles are produced with a relatively large superfluous top part by blow- moulding, so that at least the part beneath this top part has a relatively accurate constant shape on which positioning can be effected.
  • the top part is increasingly detached from the remainder of the preform, making the positioning unstable to some extent.
  • the cutting device is difficult to clean and consequently has problems being used under conditioned circumstances.
  • an object of the present invention to at least partially overcome the abovementioned drawbacks and/or to create a usable alternative.
  • this object is achieved by a cutting device according to claim 1.
  • This advantageously enables very accurate positioning of the cutting member with respect to the cutting groove throughout the entire cutting operation.
  • the accuracy and quality of the cut are in this case determined in particular by the accuracy of the cutting groove.
  • the design of the cutting device can be kept simple since few components are required. This is of benefit to cleanability of the cutting device and its use under conditioned atmospheres. It is also possible to save material, on account of the fact that the top part that is to be cut off can be kept small. The shape of the top part has no negative effect on the accuracy and quality of the cut .
  • the positioning means comprise two guides located opposite one another with guiding surfaces.
  • the guides are arranged at a fixed distance from one another.
  • the guiding surfaces are in this case at substantially the same height as the cutting member and are at a distance from one another which substantially corresponds to the diameter of the encircling cutting groove.
  • the guiding surfaces extend at least partially parallel to one another in a passage direction for the preform.
  • the preform with its cutting groove can be accurately slid through between the guides in order to search out its optimum position automatically and then to be held in this position.
  • the guiding surfaces comprise converging and/or diverging entry and exit parts.
  • the cutting device comprises a stator and a rotor, in which both the positioning means and the cutting member are connected to the rotor. During the cutting operation, the positioning means then move through the cutting groove, with the advantage that the positioning means are always located as close as possible to the cutting member without them having to extend around the entire circumference of the preform. Further preferred embodiments are defined in the subclaims .
  • the invention also relates to a method according to claim 17.
  • Fig. 1 shows a diagrammatic front view of a preferred embodiment of a cutting device according to the invention
  • Fig. 2 shows a view from below on line II-II in Fig. 1
  • Figs. 3 - 6 show views corresponding to Fig. 1, showing successive steps of positioning and cutting;
  • Fig. 7 shows a diagrammatic perspective view of an assembly of a plurality of cutting devices as shown in Fig. 1; and Fig. 8 shows a cross-sectional view on line VIII-VIII in Fig. 1; and
  • Fig. 9 shows a cross-sectional view on line IX -IX in Fig. 1.
  • the cutting device is denoted overall by reference numeral 1.
  • the device 1 comprises positioning means 2 which are composed of two guides 3 with guiding surfaces 4 which face one another and in this case form side edges of the guides 3 (cf . Fig. 2) .
  • Parts 4a of the guiding surfaces 4 extend parallel to one another in a direction which is identical to an intended passage direction 6 for a preform for a container that is to be treated through the cutting device 1.
  • the guiding surfaces 4 are provided with a converging entry part 4b and a diverging exit part 4c.
  • a sharply pointed cutting member which is fixedly connected to the associated guide 3 and is in this case formed by a blade 8 which projects inwards.
  • the blade 8 is at the same height as the guiding surfaces 4 of the guides 3.
  • the cutting device 1 is intended to cut a top part of a preform for a container.
  • Fig. 3 shows a possible embodiment of a preform 15 of this type, comprising a container 15a and a superfluous top part 16 which is to be cut off the container 15a. Between the container 15a and the top part 16 is a cutting groove 17 which encircles the preform 15 in a substantially cylindrical circumferential wall part.
  • the preform 15, including the top part 16 can be formed, for example, by blow-moulding, in which case the superfluous top part 16 is a result of this production method and is used, for example, to temporarily close off the preform 15 in an airtight manner at the top side in order to keep the container 15a clean from the inside.
  • the superfluous top part 16 can then be cut off and removed.
  • the distance between the parallel guiding surface parts 4a substantially corresponds to the diameter of the encircling cutting groove 17.
  • the blade 8 which projects from the guiding surface part 4a will automatically make an initial cut in the cutting groove 17.
  • the blade 8 has a cutting surface length which is only slightly greater than the wall thickness of the preform 15 that is to be cut through at the location of the cutting groove 17.
  • the guides 3 are provided with delimiting wall parts 20 which are intended to bear against a part of the circumferential wall of the preform 15 which is located directly beneath the cutting groove 17. This effects additional positioning of the blade 8 with respect to the cutting groove 17, which can play a role in particular when a substantial part of the cut has already been made by the blade 8.
  • delimiting wall parts 20 which are intended to bear against a part of the circumferential wall of the preform 15 which is located directly beneath the cutting groove 17.
  • Each guide 3 is suspended from a frame 22 which is connected to a rotatable rotor part 24 by means of a pivot spindle 23.
  • the pivot spindles 23 are positioned eccentrically with respect to the centre axis of the rotor part 24.
  • the guides 3 and the blade 8 as a result advantageously have the freedom to move to a certain extent when the cutting groove 17 of the preform 15 is being pushed between the guides 3. This is advantageous both when the cutting groove 17 of the preform 15 is being pushed between the guides 3 and during the cutting operation itself.
  • the cutting surface of the blade 8 can in each case correctly coincide with the intended cutting plane which extends through the cutting groove 17, with the result that the cutting force required is minimized and an accurate cut can be achieved at the intended position.
  • stator part 25 which can be moved up and down with respect to the rotor part 24 and which furthermore is arranged non-rotatably .
  • the rotor part 24 can be rotated with respect to the stator part 25 in order to enable the assembly of guides 3 and blade 8 to move around the preform 15, with the guides 3 engaging in the cutting groove 17 while the blade 8 is cutting through the wall of the preform 15 at the location of the cutting groove 17.
  • the stator part 25 is provided with clamping means, in this case formed by a diaphragm 26, for in the first instance retaining the top part 16 during the cutting operation and then removing the top part 16 after it has been cut off. Further removal of the top part 16 which has been cut off can be effected by suction via the stator part 25. It is also possible for the stator part 25 to be moved upwards to such an extent that the top part 16 which has been cut off can be pressed out, for example above a separate discharge.
  • the diaphragm may, for example, comprise an elastically deformable rosette.
  • the top parts 16 which have been cut off may be discharged by the stator part 25 being moved to above a new top part 16 of a preform 15 that is to be cut off, with in each case the top parts 16 which have been cut off in previous cycles automatically being pressed further upwards in the direction of a discharge. It is also possible to provide other retaining means for preventing undesirable rotation of the container with respect to the cutting member during cutting. In that case, the stator part may also be rotatable with respect to the rotor part.
  • FIG. 3 shows the situation in which the cutting groove 17 of the preform 15 has just been pushed between the guides 3 until it bears against the blade 8.
  • the stator part 25 is in this case in a raised position in order to enable the top part 16 of the preform 15 to pass through.
  • the stator part 25 is moved downwards, as shown in Fig. 4, in order to enclose the top part 16 and retain it using the clamping means to prevent any rotation of the preform 15.
  • the rotor part 24 is driven in rotation over an angle of at least 360 degrees by drive means 27, in this case formed by a gear wheel/toothed belt pulley.
  • the blade 8 cuts the entire top part 16 off the remainder of the preform 15.
  • the stator part 25 is moved upwards together with the top part 16 which has been cut off and is clamped securely therein, after which the container 15a as shown in Fig. 6 can be advanced past the guides 3, for example to a filling and/or closing station for filling and closing the container 15a.
  • cutting members are provided on both the opposite guides, with the result that a rotation of the cutting device of 180 degrees with respect to the preform can suffice .
  • Fig. 7 shows an assembly of a plurality of cutting devices 1 as shown and described above.
  • the cutting devices 1 are in this case positioned in adjacent pairs. Accordingly, containers 15 are supplied in pairs.
  • the cutting devices Ia can be designed in such a manner that they can be completely or partially moved upwards, so that in any event the cutting members are temporarily not blocking the way of the passage of the preforms.
  • the guides 3, which are arranged rotatably about the pivot spindles 23, can be moved away from one another in the radial direction with the aid of a suitable cam mechanism or other type of drive. In this case too, a preform can pass through the cutting device without being cut into.
  • Fig. 7 shows part of a top plate 30 through which the cutting devices 1 can fit in a sealing manner.
  • dynamic seals are provided between the rotor part 24 and the top plate 30. It is in this way possible for the space beneath the top plate 30 to be conditioned, for example by providing gas feed means which are designed to emit conditioned gases, such as substantially sterile air or hydrogen peroxide vapour or air which contains hydrogen peroxide.
  • gas feed means which are designed to emit conditioned gases, such as substantially sterile air or hydrogen peroxide vapour or air which contains hydrogen peroxide.
  • FIG. 7 shows that the rotor parts 24 are formed by a plurality of connecting rods 35 which extend from the top downwards and to which a lower ring 36 is secured. This has the advantage of making it easy to decontaminate the cutting device.
  • the device is suitable for cutting all types and sizes of preforms for containers, both preforms with a closed top part that is to be cut off and preforms with an open superfluous part that is to be cut off.
  • the cutting device according to the invention can be used both in an arrangement in which the preforms are moved in steps along a conveying path and in an arrangement in which the preforms are conveyed continuously along a conveying path.
  • the cutting device will move along the conveying path with the preform as it is cutting, whereas in the former option the cutting device is held in place during the cutting operation.
  • the conveying path may, for example, be linear or circular.
  • the guiding surfaces are preferably of a shape which is complementary to the shape of the cutting groove and/or may be shaped in such a manner that they can move as deep as possible into the cutting groove.
  • the assembly of guides and blades can be arranged such that it can to some extent be moved freely in the vertical direction, for example by an amount of approx. 1 mm, so that the guides have the freedom to search out a cutting groove at a slightly different height.
  • two guides it is also possible to use just one guide, for example a spring-loaded guide .
  • the preform can be held in place by retaining means.
  • These retaining means can then be designed to lock the preform preventing it from rotating with respect to the conveyor means during the cutting operation.
  • the retaining means can then also be used to move the preform towards the cutting device together with the conveying means.
  • the retaining means are preferably designed to retain an upper neck part of the preform, but may also be designed to retain the container body or to support the container base.
  • the invention provides a cutting device which is of simple design, is inexpensive to produce and is eminently suitable for use under conditioned environments and for reliably and accurately cutting a superfluous part off a preform for a container which is intended in particular for the food industry.

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

Abstract

L'invention concerne un dispositif destiné à découper une partie supérieure (16) pour la séparer d'une préforme (15) pour un récipient en plastique (15a) destiné à être rempli d'une substance, en particulier un aliment. Une rainure de découpe enveloppante (17) est présente dans une partie de paroi circonférentielle de la préforme (15) pour délimiter la partie supérieure (16) par rapport au récipient (15a). Outre un élément coupant (8) destiné à découper la partie supérieure (16) pour la séparer de la préforme (15) le long de la rainure de découpe (17), le dispositif comprend des moyens de positionnement (2) destinés à positionner la rainure de découpe (17) de la préforme (15) par rapport audit élément coupant (8), ainsi qu'un moyen d'entraînement (27) pour déplacer l'élément coupant (8) autour d'un axe de symétrie de la partie de paroi circonférentielle de la préforme (15). Dans ce dispositif de découpe, les moyens de positionnement (2) sont conçus pour s'accrocher dans la rainure de découpe (17) et sont disposés sensiblement à la même hauteur que l'élément coupant (8).
PCT/NL2006/000001 2005-01-14 2006-01-04 Dispositif de decoupe pour des preformes de recipients en plastique Ceased WO2006091068A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP06700250A EP1841587A1 (fr) 2005-01-14 2006-01-04 Dispositif de decoupe pour des preformes de recipients en plastique

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL1028035 2005-01-14
NL1028035A NL1028035C2 (nl) 2005-01-14 2005-01-14 Snijdinrichting voor voorvormen voor kunststof houders.

Publications (1)

Publication Number Publication Date
WO2006091068A1 true WO2006091068A1 (fr) 2006-08-31

Family

ID=35045241

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NL2006/000001 Ceased WO2006091068A1 (fr) 2005-01-14 2006-01-04 Dispositif de decoupe pour des preformes de recipients en plastique

Country Status (3)

Country Link
EP (1) EP1841587A1 (fr)
NL (1) NL1028035C2 (fr)
WO (1) WO2006091068A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019125225A1 (de) * 2019-09-19 2021-03-25 Henkel Ag & Co. Kgaa Behälter mit einer verschließbaren Behälteröffnung, Verfahren zur Herstellung eines Behälters sowie Vorrichtung zum Abtrennen eines Schutzabschnitts von einem Behälter

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3213725A (en) * 1963-03-16 1965-10-26 Settembrini Antoine Henri Di Device for cutting off packaging, more particularly of plastic material
DE1604595A1 (de) * 1965-02-09 1972-02-24 Lesieur & Ses Fils Sa Verfahren und Vorrichtung zum kreisfoermigen Schneiden von Gegenstaenden aus plastischem Material,insbesondere zum Abtrennen des Formansatzes von Flaschen
US4445406A (en) * 1982-09-29 1984-05-01 Thatcher Alan J Spin trimmer for removing flashing from the tops of plastic bottles
US20020117035A1 (en) * 2001-02-23 2002-08-29 Caupena Ernesto Vidal Device for cutting the domes of bottles
US20030188620A1 (en) * 2000-03-30 2003-10-09 Manfred Waldstadt Device for opening plastic bottles by cutting the dome
WO2004045831A1 (fr) * 2002-11-15 2004-06-03 Construcciones Mecanicas Maer, S.A. Dispositif de coupe horizontale de bouteilles en deux parties fixees les unes aux autres par le goulot
WO2004048060A2 (fr) * 2002-11-26 2004-06-10 Plastipak Packaging, Inc. Detourage d'un reservoir moule-souffle

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3213725A (en) * 1963-03-16 1965-10-26 Settembrini Antoine Henri Di Device for cutting off packaging, more particularly of plastic material
DE1604595A1 (de) * 1965-02-09 1972-02-24 Lesieur & Ses Fils Sa Verfahren und Vorrichtung zum kreisfoermigen Schneiden von Gegenstaenden aus plastischem Material,insbesondere zum Abtrennen des Formansatzes von Flaschen
US4445406A (en) * 1982-09-29 1984-05-01 Thatcher Alan J Spin trimmer for removing flashing from the tops of plastic bottles
US20030188620A1 (en) * 2000-03-30 2003-10-09 Manfred Waldstadt Device for opening plastic bottles by cutting the dome
US20020117035A1 (en) * 2001-02-23 2002-08-29 Caupena Ernesto Vidal Device for cutting the domes of bottles
WO2004045831A1 (fr) * 2002-11-15 2004-06-03 Construcciones Mecanicas Maer, S.A. Dispositif de coupe horizontale de bouteilles en deux parties fixees les unes aux autres par le goulot
WO2004048060A2 (fr) * 2002-11-26 2004-06-10 Plastipak Packaging, Inc. Detourage d'un reservoir moule-souffle

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019125225A1 (de) * 2019-09-19 2021-03-25 Henkel Ag & Co. Kgaa Behälter mit einer verschließbaren Behälteröffnung, Verfahren zur Herstellung eines Behälters sowie Vorrichtung zum Abtrennen eines Schutzabschnitts von einem Behälter

Also Published As

Publication number Publication date
NL1028035C2 (nl) 2006-07-19
EP1841587A1 (fr) 2007-10-10

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