U.S. patent application number 15/777612 was filed with the patent office on 2018-11-22 for sealing system for containers.
The applicant listed for this patent is WEIGHTPACK S.R.L.. Invention is credited to Vanni ZACCHE'.
Application Number | 20180333762 15/777612 |
Document ID | / |
Family ID | 55485123 |
Filed Date | 2018-11-22 |
United States Patent
Application |
20180333762 |
Kind Code |
A1 |
ZACCHE'; Vanni |
November 22, 2018 |
SEALING SYSTEM FOR CONTAINERS
Abstract
A sealing system is for containers, in particular of the type
that envisages sealing with an aluminum cap. Forming equipment of a
cap or seal of weldable sealing material is for the application on
the mouth of a container. The equipment includes at least one
forming device (52) of the seal or cap, the at least one forming
device (52) is arranged along the periphery of a forming roll (31)
tangent to and moved in sync with a positioning roll carrying at
least one disc or sheet of the sealing material for forming the
seal or cap.
Inventors: |
ZACCHE'; Vanni; (Goito,
Mantova, IT) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
WEIGHTPACK S.R.L. |
Goito, Mantova |
|
IT |
|
|
Family ID: |
55485123 |
Appl. No.: |
15/777612 |
Filed: |
October 17, 2016 |
PCT Filed: |
October 17, 2016 |
PCT NO: |
PCT/IB2016/056219 |
371 Date: |
May 18, 2018 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
B31D 1/005 20130101;
B65B 7/2842 20130101; B65B 61/18 20130101; B21D 51/443 20130101;
B65B 7/01 20130101 |
International
Class: |
B21D 51/44 20060101
B21D051/44; B65B 7/01 20060101 B65B007/01; B65B 7/28 20060101
B65B007/28 |
Foreign Application Data
Date |
Code |
Application Number |
Nov 19, 2015 |
IT |
102015000074330 |
Claims
1. A forming equipment of a cap or seal of weldable sealing
material for the application on the a mouth of a container, said
equipment comprising at least one forming device of said seal or
cap; wherein said at least one forming device is arranged along a
periphery of a forming roll tangent to and moved in sync with a
positioning roll carrying at least one disc or sheet of said
sealing material for forming said seal or cap.
2. The equipment according to claim 1, wherein the positioning roll
is connected to a vacuum adapted to retain the disc or sheet of
sealing material on an outer surface of the positioning roll.
3. The equipment according to claim 1, wherein the positioning roll
comprises along an outer surface thereof a plurality of mould
elements of said seal or cap, each mould element comprising a mould
profile which reproduces in negative a shape of the seal or cap,
and wherein the mould profile comprises a central hole in which a
duct is fitted which leads into a central portion of the
positioning roll, and the central portion is connected to a vacuum,
and wherein around an outer hole of the duct, a ring of
ferromagnetic material is positioned.
4. The equipment according to claim 1, wherein the forming roll
comprises a plurality of forming devices along the periphery of the
forming roll, each forming device being mounted in a swinging
manner to a first end of a rod, wherein the rod is fitted in a seat
formed inside the forming roll, so that said first end protrudes
outwards while a second end opposite the first end is facing a
cavity and pushes against a calibrated spring.
5. The equipment according to claim 4, wherein the rod has a
recessed portion with a lower shoulder and an upper shoulder, the
lower shoulder and the upper shoulder forming a stroke limiter of
the rod by interaction with a corresponding internally protruding
section of the seat, said internally protruding section having an
extension in length smaller than an extension of said recessed
portion.
6. The equipment according to claim 4, wherein, at the first end of
the rod, a pin is transversely fitted which supports in a swinging
manner the forming device and wherein the forming device includes a
body having a support end, facing outwards, and a coupling end with
the rod, a punch being removably fixed to the support end of the
body.
7. The equipment according to claim 6, wherein the punch is made of
non-ferromagnetic material and includes a hollow body which
internally accommodates a magnet, the magnet being arranged in a
central position and preferably having a cylindrical shape and an
axis perpendicular to the bases of the cylinder aligned with a
radius of the forming roll.
8. The equipment according to claim 6, wherein the coupling end of
the body of the forming device has a widened V shape with two ends
and has, at the two ends of the V shape, two fixed pins, the body
centrally having a slot arranged horizontally, in which the pin of
the rod is fitted, and wherein a spring is arranged between each of
the fixed pins, and the pin of the rod.
9. The equipment according to claim 4, wherein the first end of the
rod ends with a convex profile when viewed in the a direction
perpendicular to a plane of the forming roll.
10. A filling and sealing equipment of containers comprising the
forming equipment according to claim 1.
Description
[0001] The present invention relates to a sealing system for
containers, in particular of the type which envisages sealing with
an aluminum cap.
[0002] In sensitive liquid packaging systems, sealing systems of
the mouths of the bottles or containers are used immediately after
filling in order to guarantee integrity and absence of bacterial
contamination. Filling is typically performed in sterile
atmosphere.
[0003] Examples of applications of this type are milk and milk
derivatives, fresh fruit juice, isotonic beverages and generally
all applications characterized by extreme organoleptic sensitivity
and high possibility of perturbation due to uncontrolled
environmental aspects, arriving to the most delicate pharmaceutical
applications.
[0004] Sealing systems of this type envisage the welding of an
aluminum cap onto the mouth of the container and consist of a
plurality of discontinuous steps which generate low productivity
and high risk of errors and malfunctions. In particular, the
plastic-coated aluminum seal is formed by cutting/plastic
deformation starting from semi-finished web on reels by means of a
plurality of reciprocating and linear movements.
[0005] In the known machines, the step of forming of the seal or
cap is performed in an area outside the controlled atmosphere zone,
and then the cap is conveyed into the controlled atmosphere zones
by means of a carrying channel, generally located at a greater
height so as to exploit the force of gravity to advance the seals.
Sterilization means, typically of the induced energy type (UV
radiations), which guarantee the sterility of both the caps and the
inlet air, are arranged along the carrying channel. Finally, the
caps are positioned on the transiting containers through a release
head. Downstream of this equipment there is a machine for thermally
welding the seal onto the mouth of the container.
[0006] The system described above has a number of limitations and
inefficiencies which negatively influence production continuity of
the system mainly because of the criticality of conveying the caps
from the outside into the controlled atmosphere chamber, and very
often require restoring operations which may even cause the
alteration of the controlled atmosphere. This causes the rejection
of considerable amounts of product and the need for various
sanitation cycles to restore the correct environmental quality in
the controlled atmosphere zone.
[0007] The problem addressed by the present invention is thus to
make available a sealing system of containers which solves the
problems inherent to the equipment of the prior art.
[0008] Such a problem is solved by a forming equipment of a seal or
cap for the mouth of containers as outlined in the appended claims,
the definitions of which form an integral part of the present
description.
[0009] In particular, the invention relates to a system for making
and distributing caps or seals on the mouth of a container having
the following features:
[0010] being free from operative discontinuities,
[0011] the shearing, forming and depositing process of the cap or
seal on the mouth of the container is performed entirely inside the
controlled atmosphere chamber,
[0012] the seals or caps are entirely moved by retaining and
carrying members, thus preventing steps in which they are subject
to freely falling upstream of the releasing point of the cap onto
the mouth of the container,
[0013] continuous sterilization of the sealing material web
(typically plastic-coated aluminum) before cutting for forming
seals or caps.
[0014] Further features and advantages of the present invention
will be apparent from the description of some examples of
embodiment, given here by way of non-limiting example with
reference to the following figures:
[0015] FIG. 1 is diagrammatic plan view of a container filling and
sealing system which comprises the forming equipment according to
the present invention;
[0016] FIG. 2 is a diagrammatic view of the forming equipment
according to the invention;
[0017] FIG. 3 is a front view (according to direction A in FIG. 2)
of the positioning roll according to the invention;
[0018] FIG. 4 is a front section view (according to direction A in
FIG. 2) of a detail of the cutting roll according to the
invention;
[0019] FIG. 5 is a front view (according to direction A in FIG. 2)
of a detail of the forming roll according to the invention;
[0020] FIG. 6 is a side section view (perpendicular to direction A
in FIG. 2) of the swinging punch of the forming roll in FIG. 5.
[0021] With reference to FIG. 1, the filling and sealing system of
containers according to the present invention, indicated by
reference numeral 1 as a whole, comprises a controlled atmosphere
chamber 2, in particular a cleanroom, in which the following are
arranged in sequence:
[0022] a sterilization unit 3,
[0023] a rinsing unit 4,
[0024] a filling unit 5,
[0025] a unit 6 for receiving the seal or cap,
[0026] a sealing unit 7, and
[0027] optionally, a capping unit 8.
[0028] The containers, bottles, flasks or the like enter into the
controlled atmosphere chamber 2 through a first conveyor 9 and are
moved between the various processing unit by means of transfer
stars 10 to then be removed from the controlled atmosphere chamber
2 by a second conveyor 11.
[0029] The processing units 3, 4, 5, 6, 7, 8, the conveyors 9, 11
and the transfer stars 10 are of the conventional type and will be
selected according to the type of containers and products to be
treated. The layout of the filling and sealing system may also be
modified to take particular production needs into account.
[0030] The filling and sealing system 1 further comprises a forming
equipment 12 of a cap or seal made of a material, typically
plastic-coated aluminum, which is weldable on the mouth of a
container.
[0031] The forming equipment 12 comprises a service portion 12a
outside a controlled atmosphere chamber 2 and an operating portion
12b within the controlled atmosphere chamber 2.
[0032] The service portion 12a comprises at least one reel 13,
typically two reels 13 so to have a spare for rapidly replacing the
finished reel, of sealing material S and a series of return rolls
14, 14', 14'' for moving the web of sealing material S unwound from
the reel 13.
[0033] The sealing material S is normally plastic-coated aluminum
in form of web.
[0034] The web of sealing material S is moved by traction, in
particular by the cutting roll, as will be described below. The
reels 13 are thus provided with a brake system or a servo drive
associated with the respective unwinding spindle 16 so as to
prevent the uncontrolled unwinding thereof.
[0035] Preferably, a suction surface 15, the function of which is
to fix the web of material S in position at the time of joining for
changing the reel, is arranged downstream of the reel.
[0036] Between the reels 13 and the inlet point of the web of
material S into the operating portion 12b of the equipment 12 there
is a buffer chamber 17, having a bottom wall 17a and side walls
17b. Vacuum V is applied to the buffer chamber 17 by means of
suitable suction means 19, such as a fan, so as to create a loop A
of the web of sealing material S between a first return roll 14'
and a second pair of return rolls 14''.
[0037] The buffer chamber 17 comprises a series of detection
sensors 18, typically photocells, arranged along a side wall 17b,
so as to detect the length L of the loop A between respective
return rolls 14', 14'' and the bottom F' of the loop A. The
detection sensors 18 are connected to a command and control unit
(not shown), which in turn is connected to the unwinding spindles
16 so as to adjust the extent of the brake or the activity of the
servo drives of the spindles 16 as a function of the length L of
the loop A. In this manner, both the length L of the loop A in case
of possible decelerations or accelerations of the downstream
operating steps and the tensioning of the web of sealing material S
as determined by the value of the vacuum V in the buffer chamber
17, can be maintained constant.
[0038] The service portion 12a of the equipment 12 comprises a
rewinding reel 20 operated by a motorized rewinding spindle 21,
which recovers the scrap tape SF of sealing material S (see the
following steps of the process).
[0039] Downstream of the buffer chamber 17, the web of sealing
material S is introduced into the operating portion 12b of the
equipment 12, in the controlled atmosphere chamber 2. For this
purpose, the controlled atmosphere chamber 2 comprises a roll inlet
port 22 comprising two opposing rolls through which the web of
sealing material S passes. Similarly, the controlled atmosphere
chamber 2 comprises a roll outlet port 23 through which the scrap
tape SF passes before it is wound on the rewinding spindle 20. In
this manner, the separation between controlled atmosphere chamber 2
and the outside of the equipment (service portion 12a) is obtained.
An overpressure of air or other sterile gas present in the
controlled atmosphere chamber 2 will avoid the introduction of
non-sterile air into the operating portion 12b.
[0040] Once inside the operating portion 12b of the equipment 12,
the web of sealing material S passes through sterilization means
24. Such sterilization means 24 preferably comprise a tank 25
containing a sterilizing liquid C, e.g. a solution of peracetic
acid. Rolls 26 are arranged in the tank 25 so as to create a
tortuous path for the web of sealing material S in order to prolong
the permanence time thereof in contact with the sterilizing
liquid.
[0041] The web of sealing material S is then conveyed, by means of
appropriate return rolls 27, through rinsing or activation means
28, e.g. a series of spray nozzles dispensing sterile water or
steam. Indeed, by way of example, if peracetic acid is used as
sterilizer, it will suffice to rinse the web of sealing material S,
while if hydrogen peroxide is used, it must be activated by means
of steam.
[0042] Sterilization means of different type may be provided, e.g.
a UV radiation system, in different embodiments. In such a case,
the rinsing or activation means 28 may also be eliminated.
[0043] Downstream of the rinsing means 28 a positioning roll 29 is
arranged on which the web of sealing material S is made to
adhere.
[0044] The positioning roll 29 is tangential, in the order
according to the direction of rotation of the roll, firstly with a
cutting roll 30, adapted to cut a sheet of sealing material S from
the web, and then with a forming roll 31, adapted to shape the cut
material S into a cap or seal, e.g. in the characteristic crown
shape.
[0045] The receiving unit 6, which comprises a conveyor having a
plurality of plates 33, each of which holds a container B to be
sealed, or alternatively a sliding surface in common to all the
containers B to be sealed, is arranged underneath the positioning
roll 29.
[0046] The outer surface 29a of the positioning roll 29 is
connected to vacuum means so that the web of sealing material S is
retained on said outer surface 29a up to the cutting roll 30. The
sheet of sealing material S (which will later be shaped to provide
a seal or cap O) is cut in the tangential point between positioning
roll 29 and cutting roll 30, the sheet remaining adherent to the
positioning roll 29 by virtue of the suction, while the scrap tape
SF is drawn by the cutting roll 30, which is motorized, passing
between it and a counter-pressure roll 34, and exits from the
controlled atmosphere chamber 2 through the outlet roller door 23
to be rewound on the rewinding reel 20.
[0047] The counter-pressure roll 34 swings around a hinge 35 and is
pneumatically operated, by means of a pneumatic cylinder 36, or in
other embodiments by means of elastic systems, e.g. spring systems,
so as to ensure a predetermined pressure on the cutting roll 30 and
thus promote the traction of scrap tape SF.
[0048] The positioning roll 29 comprises, at the tangency point
with the container B to be sealed, a sector 37 in which the vacuum
is blocked, so that the cap or seal O, once the vertical is reached
over the mouth of the container B, may be released so as to be
positioned on it. The conveyor 32 thus moves away the container B
on which the seal or cap O is positioned. The container B will then
be transferred onto the hot sealing unit 7, where a press, of the
thermal rotary or induction or ultrasounds welder type, welds the
seal or cap O onto the mouth of the container B.
[0049] The positioning roll 29 comprises a plurality of mold
elements 38 of said seal or cap O along its outer surface 29a. FIG.
3 shows a cross section (taken along direction A in FIG. 2) of one
of such mold elements 38.
[0050] Each mold element 38 comprises a mold profile 39 which
reproduces in negative the shape of the seal or cap O. The mold
profile 39 comprises a central hole 40 in which a duct 41 is
fitted. The duct 41 leads into the central portion 42 of the
positioning roll 29, which, with the exclusion of the sector 37, is
connected to vacuum means. In this manner, the sheet of sealing
material S, which is cut at the tangency point with the cutting
roller 30, may be retained by the vacuum in the correct position
for the subsequent forming step.
[0051] The mold profile 39 is fixed in removable manner, e.g. by
means of fixing screws 43, to the surface of the positioning roll
29, so that it can be replaced in case of wear or for adapting the
equipment 12 for another type of seal.
[0052] A ring 44 made of ferromagnetic material, the function of
which will be clarified in the description that follows, is
positioned around the outer hole 45 of the duct 41.
[0053] A bas-relief profile 80 which corresponds to the perimeter
of the sheet of sealing material S to be cut is present around the
mold element 38.
[0054] The positioning roll 29 is fixed to a toothed wheel 46
hinged onto a support plate 47 of the equipment 1. The toothed
wheel 46 is connected to the drive of the cutting roll 31 by means
of an appropriate transmission member (not shown) for the
synchronized movement of the positioning roll 29, the cutting roll
30 and the forming roll 31.
[0055] With reference to FIG. 4, the cutting roll 30 comprises a
plurality of cutting devices 48 along its perimeter. Each cutting
device 48 comprises a blade element 49 which reproduces the shape
of the outline of the sheet of sealing material S for forming a
seal or cap O. The blade element 49 is adapted to interact with a
corresponding bas-relief profile 80 of the positioning roll 29 so
as to cut a sheet of sealing material S from the web of sealing
material S carried by the positioning roll 29.
[0056] The cutting roll 30 is fixed to a toothed wheel 50 hinged on
a support plate 51 of the equipment 12 and is coupled with an
actuator (not shown), preferably a torque direct drive type motor,
e.g. a brushless motor, for its handling. The toothed wheel is
connected by means of an appropriate driving member (not shown) to
the positioning roll 29 and the forming roll 31, so that the three
rolls 29, 30, 31 move in a synchronized manner, and in particular a
cutting device 48 is cyclically found at a respective mold element
38 during the operating step of the equipment 12.
[0057] The forming roller 31 comprises a plurality of forming
devices 52 along its perimeter.
[0058] With reference to FIGS. 5 and 6, each forming device 52 is
mounted in swinging manner to a first end 53 of a rod 54. The rod
54 is fitted in a seat 55 formed inside the forming roll 31, so
that said first end 53 protrudes outwards, while the second end 56,
opposite to the first end, faces towards a cavity 57 and pushes
against a pre-calibrated spring 58, preferably a cup spring.
[0059] The rod 54 has a recessed portion 59 with a lower shoulder
60a and an upper shoulder 60b. The lower shoulder 60a and the upper
shoulder 60b form stroke limiting means of the rod 54 by
interacting with a corresponding internally protruding section 61
of the seat 55, having a lengthwise extension smaller than the
extension of said recessed portion 59. So the rod 54 can travel a
limited stroke contrasted by the pre-calibrated spring 58. In this
manner, the forming device 52 can impart a predetermined forming
pressure on the mold element 38 of the positioning roll 29.
[0060] A pin 62, which supports the forming device 52 in swinging
manner, is transversely fitted at the first end 53 of the rod
54.
[0061] The first end 53 of the rod 54 ends with a convex profile 70
when viewed in direction perpendicular to the plane of the forming
roll 31.
[0062] The forming device 52 comprises a body 63 having an outward
facing support end 64a and a coupling end 64b with the rod 54.
[0063] A punch 65 is removably fixed at the support end 64a of the
body 63. The punch is made of non-ferromagnetic material, e.g. a
plastic material, and comprises a hollow body 66 which internally
accommodates a magnet 67, preferably a permanent magnet. The magnet
67 is arranged in central position and is preferably cylindrical
with an axis perpendicular to the bases of the cylinder aligned
with a radius of the forming roll 31. If necessary, the magnet 67
may be held in position by a retaining plate 68 arranged between
the magnet 67 and the base 69 of the punch 65.
[0064] The coupling end 64b of the body 63 of the forming device 52
has an widened V shape and has two fixed pins 71, 71' at the two
ends of the V. The body 63 centrally has a slot 72 arranged
horizontally, in which the pin 62 of the rod 54 is fitted. A spring
73, 73', preferably a coil spring, is arranged between each of the
fixed pins 71, 71', and the pin 62 of the rod 54.
[0065] The forming roll 31 is, in turn, hinged to a support 74 of
the equipment 1 and comprises a toothed wheel 75. The toothed wheel
75 is coupled, by means of the previously described transmission
member, to the actuator of the cutting roll 30 to move it in synch
with the positioning roll 29 and the cutting roll 30. In
particular, a forming device 52 will be cyclically at a respective
mold element 38 during the operating step of the equipment 12.
[0066] The operation of the equipment 12 of the invention will now
be described.
[0067] The web of sealing material S is unwound by one of the two
reels 13 arranged outside the controlled atmosphere chamber 2 and
enters into it through the door 22. The correct tensioning of the
web is ensured by detecting the length L of the loop A by one of
the detection sensors 18 and by respectively actuating the braking
or servo drive system of the spindle 16 of the reel 13.
[0068] Once inside the controlled atmosphere chamber 2, the web of
sealing material S is firstly sterilized by passing through the
tank 25 of sterilizing liquid C, and then rinsed by the rinsing
means 28 to be transferred onto the positioning roll 29, on which
the web of material S adheres by means of vacuum.
[0069] Having reached the tangency point with the cutting roll 30,
a sheet of sealing material S which will then form a seal or a cap
O will be singled out by interaction of the mold element 38 with a
cutting device 48. The scrap tape SF is moved away from the cutting
roll 30 and is then rewound on the rewinding reel 20, while the
sheet of material S is retained by the vacuum applied by the mold
element 38 through the duct 41 and is then held in this position
until the tangency point with the conveyor 32 is reached, on the
vertical of the container B, after having passed the tangency point
of the positioning roll 29 with the forming roll 31 and been formed
into a seal or a cap O. When the seal or cap O is over the
container B, the vacuum is interrupted and the seal or cap O is
released and drops by gravity on the mouth of the container B,
ready for the next step of sealing.
[0070] The seal or cap O is formed as follows.
[0071] When the sheet of sealing material S carried by a mold
element 38 of the positioning roll 29 approaches the tangency point
with the forming roll 31, in synch with a forming device 52, the
magnet 67 of the latter interacts with the ring 44 of ferromagnetic
material of the mold element 38. As mentioned, the forming device
52 swings about the pin and has a further degree of sliding freedom
by virtue of the slot 72 in which the pin 62 is inserted. Thus, by
virtue of such possibilities of movement and the magnetic
attraction force exerted on the ring 44, the forming device 52 is
oriented so as to follow, along its path for a rotation angle up to
.+-.15.degree. with respect to the tangency point between the
positioning roll 29 and the forming roll 31, the mold element 38,
coupling to it on opposite and parallel planes. In this manner, the
interaction is obtained between punch 65 and mold profile 39 and
thus the seal or cap O is formed. As mentioned above, the correct
forming pressure is ensured by the calibration of the spring 58 on
which the rod 54 insists.
[0072] As a consequence, the equipment 12 of the invention achieves
the predetermined objects.
[0073] Indeed, the forming process of the seal or cap is continuous
by interacting with the moveable rolls in synch during the step of
cutting, of forming and of releasing onto the mouth of a
container.
[0074] Furthermore, the forming process of the caps is performed in
a sterile chamber and the caps are guided by rollers and retained
adherent to them by the vacuum until it is released on the
container.
[0075] It is a further object of the invention a method of sealing
containers B with a seal or cap O, said method comprising the steps
of: [0076] a) introducing a web of sealing material S, preferably a
plastic-coated aluminum web, into a controlled atmosphere chamber
2; [0077] b) sterilizing said web of sealing material S; [0078] c)
moving said web of sealing material S on a positioning roll 29;
[0079] d) passing said web of sealing material S at a cutting roll
30 so as to single out a disc or sheet of sealing material S;
[0080] e) passing said disc or sheet of sealing material S on said
positioning roll 29 at a forming roll 31 having at least one punch
65 so as to form said seal or cap O; [0081] f) releasing said seal
or cap O on the mouth of a container B,
[0082] wherein steps b) to f) are carried out continuously inside
said controlled atmosphere chamber 2.
[0083] It is apparent that only some particular embodiments of the
present invention have been described, to which a person skilled in
the art will be able to make all the changes necessary to adapt it
to particular applications, without however departing from the
scope of protection of the present invention.
* * * * *