EP2177331B1 - Mould for manufacturing agglomerated cork stoppers - Google Patents

Mould for manufacturing agglomerated cork stoppers Download PDF

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Publication number
EP2177331B1
EP2177331B1 EP20090173484 EP09173484A EP2177331B1 EP 2177331 B1 EP2177331 B1 EP 2177331B1 EP 20090173484 EP20090173484 EP 20090173484 EP 09173484 A EP09173484 A EP 09173484A EP 2177331 B1 EP2177331 B1 EP 2177331B1
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EP
European Patent Office
Prior art keywords
bush
plates
mould
moulding
moulds
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.)
Active
Application number
EP20090173484
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2177331A1 (en
Inventor
Riccardo Cavallini
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.)
Meacci Srl
Original Assignee
Meacci Srl
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
Priority claimed from ITFI2008A000202A external-priority patent/IT1391079B1/it
Priority claimed from ITFI20080058 external-priority patent/ITFI20080058U1/it
Application filed by Meacci Srl filed Critical Meacci Srl
Publication of EP2177331A1 publication Critical patent/EP2177331A1/en
Application granted granted Critical
Publication of EP2177331B1 publication Critical patent/EP2177331B1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27J—MECHANICAL WORKING OF CANE, CORK, OR SIMILAR MATERIALS
    • B27J5/00—Mechanical working of cork

Definitions

  • the present invention relates to the field of the machines for manufacturing agglomerated cork stoppers, and more particularly it relates to a mould for manufacturing agglomerated cork stoppers as per the preamble of claim 1.
  • a method for forming agglomerated cork stoppers using such a mould as per the preamble of claim 11 is also an object of the invention. Such a mould and method is disclosed by document US 2 830 326 .
  • agglomerated cork stoppers are manufactured according to different methods, depending on the quality of the raw material available. In high quality productions the stoppers are manufactured in a single piece from a compact cork matrix directly coming from a tree bark, while in lower quality products use is made of agglomerated cork granules obtained from the processing waste of high quality stoppers, or from batches that do not possess the required quality for one-piece stoppers; the granules are bonded by a non-toxic glue matrix.
  • agglomerated stoppers Various methods are known for manufacturing agglomerated stoppers.
  • One of these methods provides for the introduction of doses of agglomerated granules mixed with binding agents into moulds comprising moulding bushes.
  • the agglomerate with binding agent is then pressed and subsequently transferred into an oven for the time required for solidification.
  • the stopper is removed from the moulding bush by applying pressure using an extraction rod-like body.
  • the preparation of the correct amount of granules to be introduced into the corresponding mould is carried out through dosing machines.
  • the system for forming the stoppers provides for drive means made up of chains to which a sequence of moulds is connected. Such drive means carry the moulds according to a cycle comprising a passage in front of the dosing machine, through an oven and then in an extraction area.
  • the moulds for manufacturing agglomerated cork stoppers are made up of a framework with two elongated plates and a series of moulding bushes aligned between such plates. Holes are formed in the plates, one for each bush.
  • the bushes are fixed to a common translation actuator which brings about a linear movement of the bushes from a position wherein the same are arranged in a manner corresponding to the holes to allow for the introduction of the doses of cork granules, to a displaced wherein the bushes are closed by the inner faces of the plates, in view of the forming step.
  • Such moulds e.g. the one disclosed in US 2830326 are generally bulky and poorly adapt to the possibility of varying the size of the moulding bushes.
  • the entire mould needs be dismounted, hence making the operation scarcely practical.
  • the use of the mould is not flexible, given that only two pre-set sizes are provided for, in the construction stage of the mould.
  • Such presetting is due to the fact that the mould comprises an intermediate plate arranged between an elongated plate of the framework, and the bush.
  • Such intermediate plate is perforated in an identical manner with the holes of the elongated plate. The bush abuts against such intermediate plate.
  • the bush may move from an open position to a closed position on said intermediate plate, while, alternatively, it may move integrally with such intermediate plate which, in correspondence with its hole, shall provide for an "extension" of the bush itself.
  • the bush with the intermediate plate shall be closed by the elongated plate.
  • moulds are manufactured with a large number of cavities, thus being poorly flexible when it comes to obtaining batches with a reduced number of agglomerated cork stoppers.
  • the main object of the present invention is that of overcoming the drawbacks of the moulds of the above mentioned known type, and in particular of providing a mould for agglomerated cork stoppers which can be particularly flexible in use.
  • Another object of the present invention is to provide a mould for agglomerated cork stoppers which can be mounted and remounted easily.
  • Another object of the present invention is to provide a mould for agglomerated cork stoppers that works in a reliable manner.
  • a further object of the present invention is to obtain a mould for agglomerated cork stoppers in which the size of the stoppers obtainable is easily adjustable.
  • a still further object of the present invention is to provide a system for forming cork stoppers that is flexible in use and capable of reducing waste of material with respect to the prior art.
  • Such configuration of the mould allows for better and quicker management of the operations for replacing the moulding bushes in order to vary their capacity, because the bushes are no longer sequentially linked with each other.
  • such mould has a single moulding bush, in such a manner to be able to fully control the dimensions of the production batch.
  • the lower weight of each "single-cavity" mould makes the task of the operators easier when the mould is installed.
  • the simplified structure of a mould having a single moulding cavity results in a more reliable operation and makes the size adjustments much simpler.
  • the invention also provides for a method for manufacturing agglomerated cork stoppers having the features as in attached claim 11.
  • a mould for manufacturing agglomerated cork stoppers according to the invention is indicated in its entirety at number 10.
  • Such mould 10 comprises two opposite plates 11, substantially symmetric, separated by four spacer elements 12, such as bars fixed to the plates 11 in proximity to the edges of the latter through screws 13.
  • guide means 14 are arranged for making a moulding bush 15 slide between an open position (see figures 1 and 2 ) for introducing cork granules and removing the formed stopper, and a closed position (see figure 3 ).
  • the bases of the bush 15 are in contact with the inner faces 11a.
  • Such guide means 14 comprise, for each inner face 11 a, a track 16 made up of two parallel rails 16a defined at the side edges of the plates, spaced from each other by a length substantially equivalent to the outer diameter of the bush 15.
  • Such rails are for example made up of a substantially U-shaped foil and welded on the inner faces 11a.
  • the track 16 defines the displacement direction (indicated at L in figure 1 ) of the bush 15.
  • the upper part of the track 16 ends with two sections of the rails 16 converging with respect to each other to define upper stop abutments 17 for the bush 15.
  • the bush 15 when the bush 15 is in abutment against such upper stop abutments 17, it is in the opening position for introducing cork granules or for removing the stopper once it is formed.
  • the bush In such an open position, the bush is coaxial with two corresponding opposite circular apertures 18 formed through respective plates 11.
  • the maximum inner diameter of the bushes 15 useable in the mould is smaller than the diameter of the circular apertures 18. Therefore, the bases of the bush 15, that are formed by circular rings, radially project inwards with respect to the apertures 18 thus defining an abutment for the nozzles of the dosing containers, as better explained hereafter.
  • the end of the track 16 opposite to the upper stop abutments 17 is open downwards in correspondence with the closed position of the bush (see figure 3 ).
  • removable stop means 19 when present, define the positioning abutment of the bush 15 in closure; on the contrary, when removed, the stop means 19 permit the extraction or insertion of the bush from/to the plates.
  • the removable stop means 19 comprise for example, for each plate 11, a seat 20, defined on the inner face 11a, for accommodating a stop insert 22 transversely projecting with respect to the sliding direction of the bush in the track 16.
  • reversible locking means 23 for locking the same insert in the seat 20.
  • the seat 20 is made up of a circular through hole inserted into which is a pin with the head protruding in the track 16 and the opposite end locked by an elastic ring which forms the reversible locking means 23.
  • a length adjusting element 24 In order to reduce the length of the moulding bush, for example to have a smaller stopper, use is made of a length adjusting element 24, practically made up of a sheet having a thickness equivalent to the difference between the maximum bush length available between the plates 11 (in the example of the description, the distance between the plates) and the length of the bush to be used for forming the stopper.
  • a sheet is inserted into one of the two tracks 16 and locked at an end using the stop insert (in a longer version with respect to the case when element 24 is not present) associated to that track.
  • the sheet has a circular through hole 25, substantially having the same size as the apertures 18 formed in the plates 11. When the sheet 24 is arranged in position, such through hole 15 is coaxial with respect to the apertures 18.
  • the end of the sheet 24 opposite to the locking end is counter-shaped to the upper stop abutments 17 of the track 16.
  • Respective stirrups 26 are arranged on the outer faces 11 b of the plates 11 for allowing the connection of the mould 10 to drive means for driving the mould throughout the forming apparatus, such means being described hereafter.
  • a system for forming cork stoppers using a plurality of such moulds 10 can be seen in figure 6 and it is indicated at S in its entirety.
  • Such system provides for means 30 for driving the moulds 10 throughout various work stations, among which a dosing station D which comprises, facing each other, two devices 31 for dosing granules inside the bushes 15 of the moulds 10.
  • the devices 31 are of a type known as such.
  • the drive means 30 comprise two chains 30a (denoted with a dash-dot line) mounted parallel on respective motorized pulleys 33 (only one of them is shown in figure 6 ) and corresponding idler means (not shown) which allows the chains to move on two parallel vertical planes.
  • each stirrup 26 of a mould 10 is reversibly fixed to a respective chain.
  • the moulds 10 are fixed to the chains (for example through bolts screwed onto counter-supports provided for on the same chains) in such a manner that the track 16 takes on a vertical arrangement.
  • FIG 6 there is shown a lower branch 30a' of the chain which carries the moulds 10 returning from the stopper extraction zone, to a couple of granule dosing devices 31. From the lower branch 30a' the moulds are rotated by 180° on the pulley, thus positioning them on an upper branch 30a" of the chain which carries them to the dosing station.
  • Each granule dosing device 31 comprises a hopper 33 for introducing granules, drawers 34, delineated by a dashed line in figure 7 , wherein the doses are prepared, and nozzles 35 for introducing the doses of granules into the bushes 15 of the moulds 10.
  • the path of the granules is marked in figure 7 by a dashed line G.
  • each granule dosing device 31 comprises two dosing drawers 34 with corresponding nozzles 35 which simultaneously feed two respective moulds.
  • the two dosing devices 31 facing each other work simultaneously and each prepare a half of the dose.
  • Means 27 for centering the mould 10 with respect to granule dosing devices for dosing the granules in the bush, are associated to the same mould. Such means are required due to the fact that the center-to-center distance between the moulds along the chain may vary over time (for example due to wear and occurrence of clearances on the chain and in the mechanisms associated thereto, and due to the stretching of the same chain) and it is therefore necessary to ensure a correct positioning of the mould on the dosing station in case of a displacement induced by the chain which might not be sufficiently precise.
  • centering means 27 comprise two opposite centering references 28 defined on the lateral edges of the plates 11, such as two concave lateral recesses of the plates which are adapted to be coupled with respective centering pins 35a of respective nozzles 35.
  • Figure 7 shows a dosing station wherein a mould 10 is represented during the step of introducing a dose of granules with the bush at the open position to allow for the loading.
  • the nozzles 35 which are performing the loading step, are moved towards the bush by means of horizontal translation actuators 36, such as cylinders. It should be observed how the nozzles end up in abutment against respective bases of the bush that project with respect to the diameter of the respective circular apertures 18 formed in the opposite plates 11. In practice, the nozzles 35 have dimensions in the range between the diameter of the circular apertures 18 and the inner diameter of the bush 15.
  • the bush 15 is displaced vertically through displacement means.
  • a vertical displacement actuator 37 such as a cylinder
  • a second vertical displacement actuator 38 At the upper part of the bush, in contact therewith, there is a second vertical displacement actuator 38.
  • the second vertical displacement actuator 38 When the bush is filled with granules, the second vertical displacement actuator 38, the upper one, is activated with a consequent pressure exerted on the bush 15 (see figure 8 ).
  • the latter lowers, abutting against the vertical displacement actuator 36, which, retracting, still continues to support the bush.
  • the bush 15 Upon reaching the closed position, the bush 15 is in abutment against the lower stop means 19.
  • the nozzles 35 are moved backwards, freeing the mould, and the chain drive means transport the granule-filled moulds outside the dosing station, driving the subsequent moulds to be filled into the same station.
  • the described mould which advantageously has only one moulding bush, can be made up of two opposite plates between which parallel guide means are arranged for guiding two bushes which may displace parallel with respect to each other but on distinct displacement lines.
  • the mould may also comprise three bushes that are displaced on parallel lines.
  • the interaction of the nozzles of the dosing devices with the loading apertures of the mould according to the invention permits to avoid wasting granules during the loading step, and at the same time the cleanliness of the components is improved.
  • the particular structure of the mould allows for a wider adjustment range of the capacity of the moulding bushes with respect to the moulds of the prior art, in that a length adjusting element 24 of the moulding bush can be selected having the desired thickness, and replaced anytime at will.
  • the variant embodiment illustrated in figure 9 and figure 10 is capable of attaining a further important advantage.
  • the guide tracks 116 and i.e. practically the foils which, welded to the inner faces 111a of the plates 111, define the tracks themselves, have a slightly greater thickness (increased for example to about 3 mm), in such a manner to allow the insertion, still between the plates 111, of small auxiliary plates 124 contoured identically to the above mentioned length adjuster of the bush (shown in figure 4 ).
  • auxiliary plates 124 Mounting of such contoured auxiliary plates 124 is carried out in a manner analogous to the length adjuster, by inserting the same auxiliary plates into respective tracks 116, and locking by means of the upper stop means 117 and the stop inserts 122, suitably increased in length.
  • the auxiliary small plates 124 in turn have through holes 125 corresponding to the apertures 118 formed in the main plates 111, having a diameter greater with respect to the inner diameter of the bush 115, hence the latter is held tight by the abutment of the two small plates 124 on both sides.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
EP20090173484 2008-10-20 2009-10-20 Mould for manufacturing agglomerated cork stoppers Active EP2177331B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITFI2008A000202A IT1391079B1 (it) 2008-10-20 2008-10-20 Stampo per la realizzazione di tappi in agglomerato di sughero
ITFI20080058 ITFI20080058U1 (it) 2008-12-10 2008-12-10 Stampo per la realizzazione di tappi in agglomerato di sughero

Publications (2)

Publication Number Publication Date
EP2177331A1 EP2177331A1 (en) 2010-04-21
EP2177331B1 true EP2177331B1 (en) 2013-01-30

Family

ID=41624845

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20090173484 Active EP2177331B1 (en) 2008-10-20 2009-10-20 Mould for manufacturing agglomerated cork stoppers

Country Status (3)

Country Link
EP (1) EP2177331B1 (pt)
ES (1) ES2403216T3 (pt)
PT (1) PT2177331E (pt)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITUA20162476A1 (it) * 2016-04-11 2017-10-11 Meacci S R L Apparecchiatura di stampaggio per la realizzazione di tappi in agglomerato di sughero

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB177474A (en) * 1922-01-05 1922-03-30 Charles Edward Mcmanus Improvements in carriers for cork rod bakers
US1627601A (en) * 1922-08-18 1927-05-10 Crown Cork And Seal Company Of Apparatus for compacting granular material
US1673904A (en) * 1925-07-01 1928-06-19 Crown Cork & Seal Co Apparatus for producing articles of compacted granular material
US2477258A (en) * 1944-07-01 1949-07-26 Hpm Dev Corp Turret injection machine
US2830326A (en) * 1953-06-08 1958-04-15 Weisenburg Andrew Art of extruding cork for the manufacture of bottle caps and the like
IT1218538B (it) * 1987-03-19 1990-04-19 Meacci Srl Apparecchiatura per la produzione automatica di tappi di sughero agglomerato

Also Published As

Publication number Publication date
EP2177331A1 (en) 2010-04-21
ES2403216T3 (es) 2013-05-16
PT2177331E (pt) 2013-05-06

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