NZ603632B2 - Cutter, packaging apparatus and method of cutting a film - Google Patents
Cutter, packaging apparatus and method of cutting a film Download PDFInfo
- Publication number
- NZ603632B2 NZ603632B2 NZ603632A NZ60363212A NZ603632B2 NZ 603632 B2 NZ603632 B2 NZ 603632B2 NZ 603632 A NZ603632 A NZ 603632A NZ 60363212 A NZ60363212 A NZ 60363212A NZ 603632 B2 NZ603632 B2 NZ 603632B2
- Authority
- NZ
- New Zealand
- Prior art keywords
- teeth
- film
- blade
- cutter
- packaging apparatus
- Prior art date
Links
- 238000004806 packaging method and process Methods 0.000 title claims abstract description 62
- 238000005520 cutting process Methods 0.000 title claims description 80
- 230000000149 penetrating Effects 0.000 claims description 6
- 239000000463 material Substances 0.000 description 12
- 239000002985 plastic film Substances 0.000 description 7
- 238000010438 heat treatment Methods 0.000 description 6
- 238000004140 cleaning Methods 0.000 description 5
- 235000013305 food Nutrition 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 230000035515 penetration Effects 0.000 description 4
- 239000004698 Polyethylene (PE) Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- -1 polyethylene Polymers 0.000 description 3
- 229920000573 polyethylene Polymers 0.000 description 3
- 239000004952 Polyamide Substances 0.000 description 2
- 229920002647 polyamide Polymers 0.000 description 2
- 239000011528 polyamide (building material) Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 230000001154 acute Effects 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 239000006261 foam material Substances 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
- B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
- B26D1/0006—Cutting members therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
- B26F1/00—Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
- B26F1/38—Cutting-out; Stamping-out
- B26F1/44—Cutters therefor; Dies therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
- B26F1/00—Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
- B26F1/38—Cutting-out; Stamping-out
- B26F1/44—Cutters therefor; Dies therefor
- B26F2001/4481—Cutters therefor; Dies therefor having special lateral or edge outlines or special surface shapes, e.g. apertures
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
- B65B51/00—Devices for, or methods of, sealing or securing package folds or closures; Devices for gathering or twisting wrappers, or necks of bags
- B65B51/10—Applying or generating heat or pressure or combinations thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
- B65B61/00—Auxiliary devices, not otherwise provided for, for operating on sheets, blanks, webs, binding material, containers or packages
- B65B61/005—Auxiliary devices, not otherwise provided for, for operating on sheets, blanks, webs, binding material, containers or packages for removing material by cutting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
- B65B61/00—Auxiliary devices, not otherwise provided for, for operating on sheets, blanks, webs, binding material, containers or packages
- B65B61/04—Auxiliary devices, not otherwise provided for, for operating on sheets, blanks, webs, binding material, containers or packages for severing webs, or for separating joined packages
- B65B61/06—Auxiliary devices, not otherwise provided for, for operating on sheets, blanks, webs, binding material, containers or packages for severing webs, or for separating joined packages by cutting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
- B65B61/00—Auxiliary devices, not otherwise provided for, for operating on sheets, blanks, webs, binding material, containers or packages
- B65B61/04—Auxiliary devices, not otherwise provided for, for operating on sheets, blanks, webs, binding material, containers or packages for severing webs, or for separating joined packages
- B65B61/06—Auxiliary devices, not otherwise provided for, for operating on sheets, blanks, webs, binding material, containers or packages for severing webs, or for separating joined packages by cutting
- B65B61/065—Auxiliary devices, not otherwise provided for, for operating on sheets, blanks, webs, binding material, containers or packages for severing webs, or for separating joined packages by cutting by punching out
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
- B65B7/00—Closing containers or receptacles after filling
- B65B7/16—Closing semi-rigid or rigid containers or receptacles not deformed by, or not taking-up shape of, contents, e.g. boxes or cartons
- B65B7/162—Closing semi-rigid or rigid containers or receptacles not deformed by, or not taking-up shape of, contents, e.g. boxes or cartons by feeding web material to securing means
- B65B7/164—Securing by heat-sealing
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T83/00—Cutting
- Y10T83/04—Processes
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T83/00—Cutting
- Y10T83/929—Tool or tool with support
- Y10T83/9319—Toothed blade or tooth therefor
- Y10T83/9324—With additional cutting means
Abstract
packaging apparatus includes a film cutter blade 20 that is formed into a closed shape and which has a plurality of first teeth A1 and a plurality of second teeth A2. The first teeth are longer than the second teeth so that in use the first teeth contact a surface of the film 15 to be cut before the second teeth do. In practice the blade is forced downwardly onto the film forming a lid of a film sealed package so that the film is cut neatly around the periphery of the package with a single downward stroke of the blade. he second teeth do. In practice the blade is forced downwardly onto the film forming a lid of a film sealed package so that the film is cut neatly around the periphery of the package with a single downward stroke of the blade.
Description
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CUTTER, PACKAGING APPARATUS AND METHOD OF CUTTING A FILM
Technical Field
The present invention generally relates a packaging apparatus comprising a
cutter and a method of cutting a film. Optionally, the packaging apparatus comprises
a tray lidding machine. The cutter is used to cut a film before or after the film is
sealed to a tray.
Background Art
A packaging apparatus may be used to package a food product. The food
product may be packaged in a tray with a lidding film forming a lid. A machine such
as a tray lidding machine may be used to seal the lidding film onto the flange of the
tray to form the film lid. A blade is used to cut a portion of a supply of lidding film
to size, thereby to form the film lid.
The blade can be used to cut the lidding film either before or after the film is
sealed onto the tray. During the cutting process, it is desirable that the blade cuts
completely through the film at the first attempt. The blade may be serrated, with a
series of triangular teeth having pointed tips. The blade can cut a portion of the film
that fits the tray.
It is an object of the present invention to provide a packaging apparatus
comprising a serrated blade; and/or to provide a method of cutting a film; and/or to at
least provide the public with a useful choice.
Disclosure of the Invention
Described herein is a cutter for a packaging apparatus, the cutter forming a
shape and comprising at least one blade, each blade comprising a plurality of first
teeth and a plurality of second teeth, wherein the first teeth are longer than the
second teeth such that in use the first teeth contact a surface to be cut before the
second teeth.
Accordingly, described herein is a cutter that can cut through a surface to be
cut in an efficient way. In particular, the cutter reduces stretching of the surface to
be cut during a cutting operation. The less the surface stretches, the more complete
the cut. In the context of tray lidding, the movement of the cutter is limited by the
presence of the tray. The component that holds the cutter cannot move beyond the
tray itself. The cutter is required to move a lesser distance through the surface so as
to complete the cut. As a result, the cut has a more desirable aesthetic appearance
due to a reduced stretching of the material.
Optionally, the first teeth are interspersed with second teeth of the plurality of
second teeth.
Accordingly, it is possible to avoid applying uniform pressure along the
cutting perimeter of the surface to be cut. This reduces elongation of the surface to
be cut which would otherwise hinder the cutting process.
Optionally, the cutter forms a substantially closed shape.
Accordingly, the cutter forms a die cut such that a lid can be cut to the desired
shape from a portion of film in a single cut .
Optionally, the first teeth are longer than the second teeth by a distance
within the range of from about 0.5mm to about 1.0mm.
Optionally, the first teeth are longer than the second teeth by a factor within
the range of from about 1.00 to about 1.50.
Accordingly, the difference in teeth length is sufficiently great that the
pressure applied along the cutting perimeter is sufficiently non-uniform so as to
prevent undesirable stretching of the surface to be cut during the cutting operation.
Furthermore, the difference in length between the teeth is sufficiently small that the
blade is required to move a relatively small distance relative to the surface to be cut
in order to perform the cutting operation. This improves the cleanness of the cut,
thereby improving its aesthetic appearance.
Optionally, the first teeth are arranged along the blade at an average interval
within the range of from about 5mm to about 10mm.
Accordingly, the distance between the first teeth is sufficiently great so as to
reduce the pressure applied on the surface to be cut. This reduces the stretching of
the surface during the cutting operation. The distance between the first teeth is
sufficiently small such that the first teeth can penetrate the surface to be cut so as to
perform the cutting operation effectively.
Optionally, the at least one blade comprises a substantially equal number of
first teeth and second teeth; or
the at least one blade comprises about three times the number of second teeth
as first teeth.
Accordingly, the ratio of first teeth to second teeth can be chosen so as to
minimize stretching of a film to be cut during a cutting operation.
Optionally, the plurality of second teeth comprises at least two sets of teeth
that have different lengths such that in use the two sets of teeth contact a surface to
be cut at different times.
Accordingly, the cutter comprises teeth of three different lengths such that
during a cutting operation the first teeth contact the surface to be cut first. The first
teeth start penetrating the surface. Then, on a second step, the longer of the two sets
of second teeth continue the cutting of the surface. Then, on a third step, the shorter
of the two sets of second teeth complete the cutting of the surface in an efficient way.
Optionally, each of the first teeth and/or each of the second teeth forms a
sharp point at its tip having an angle, in the plane of the blade, within the range of
from about 50 degrees to about 60 degrees.
Accordingly, the teeth can penetrate the surface to be cut while reducing the
undesirable stretching of the surface during the cutting operation. Furthermore, the
first teeth can, during the penetration of the surface, create a slit that is sufficiently
long as to aid the completion of the cutting operation during the second and
optionally third cutting steps.
Optionally, the thickness of each blade tapers towards the tips of the first
teeth and/or towards the tips of the second teeth.
Accordingly, the sharpness of the blade can be improved. The blade may
have sharp singular points at which it comes into contact with a surface to be cut.
This helps penetration of the surface by the blade.
According to the invention, there is provided a packaging apparatus
comprising a cutter for cutting a film, the cutter forming a shape and comprising at
least one blade, each blade comprising:
a plurality of first teeth; and
a plurality of second teeth;
wherein the first teeth are longer than the second teeth such that in use the
first teeth contact a surface of the film to be cut before the second teeth and wherein
the cutter forms a closed or substantially closed shape.
Accordingly, the cutter can be used to perform clean cuts in packaging
processes.
Optionally, the packaging apparatus comprises an actuator configured to
move the blade in a cutting operation, wherein the packaging apparatus is configured
such that the actuator moves the cutter by a maximum distance within the range of
from about 5mm to about 15mm.
Accordingly, the cutter may be moved by a sufficient distance so as to
perform a complete cut of the surface to be cut. Furthermore, the movement of the
cutter relative to the surface to be cut is limited such that the aesthetic appearance of
the completed cut is improved.
Optionally, the packaging apparatus comprises a sealer configured to seal a
film to a tray, wherein optionally the packaging apparatus is configured such that in a
packaging operation, the film is sealed to the tray before the film is cut by the cutter.
Alternatively the packaging apparatus is configured such that in a packaging
operation, the film is sealed to the tray after the film is cut by the cutter
Accordingly, the cutter can be used in the context of a packaging apparatus
that applies film lids to trays.
Optionally, the sealer is configured to heat to a temperature within the range
of from about 100 degrees Celsius to about 150 degrees Celsius so as to seal the film
to the tray.
Accordingly, the cutter can be used to efficiently cut a film that has
undergone heating. This is significant because when a film is heated, it can become
even more stretchable than normal. As such, a heated film is more susceptible to
undergo undesirable elongation and/or stretching during a cutting operation. Hence,
a heated film can be more difficult to cut than a non-heated film. The cutter can cut
thin and stretchable films even after they have undergone heating.
Optionally, the packaging apparatus comprises a film dispenser configured to
dispense film that has a thickness of less than about 30 micrometers and/or a
Young’s modulus of less than about 100,000 MPa, wherein the packaging apparatus
is configured such that the serrated cutter cuts the film.
Accordingly, the blade can be used to efficiently cut through a film that is
particularly elastic.
According to the invention, there is provided a method of cutting a film
comprising the steps of:
providing a cutter forming a shape and comprising at least one blade, each
blade comprising a plurality of first teeth and a plurality of second teeth, wherein the
first teeth are longer than the second teeth and wherein the cutter forms a closed or
substantially closed shape; and
cutting the film with the cutter such that the first teeth contact the film before
the second teeth.
Optionally, the second teeth start penetrating the film before the film is
completely cut.
According to the invention, there is also provided use of the packaging
apparatus of the invention in the context of tray lidding.
Brief Description of the Drawings
Figure 1 depicts a serrated blade according to an embodiment;
Figure 2 depicts a plan view of a serrated blade according to an embodiment;
Figure 3 depicts a serrated blade according to an embodiment;
Figure 4 depicts a cross-sectional view of a portion of a serrated blade
according to an embodiment;
Figure 5 depicts a serrated blade according to an embodiment;
Figure 6 depicts a packaging apparatus according to an embodiment of the
present invention;
Figure 7 depicts a part of a packaging apparatus according to an embodiment
of the present invention;
Figure 8 depicts a part of a packaging apparatus according to an embodiment
of the present invention;
Figure 9 depicts a serrated blade according to an embodiment;
Figure 10 depicts a plan view of a serrated blade according to an
embodiment;
Figure 11 depicts a plan view of a serrated blade according to an
embodiment; and
Figure 12 depicts a plan view of a serrated blade according to an
embodiment.
Mode for the Invention
Figure 1 depicts a blade 10 of a cutter 20 according to an embodiment. The
cutter 20 may be for a packaging apparatus 1. The cutter 20 may form a shape. The
cutter 20 comprises at least one blade 10. Each blade 10 may comprise a plurality of
first teeth 11 and a plurality of second teeth 12. The first teeth 11 may be longer than
the second teeth 12 such that in use the first teeth 11 contact a surface 15 to be cut
before the second teeth 12.
The shape formed by the cutter 20 is not particularly limited. A shape is two
dimensional. Hence a single straight line is not a shape, but an L-shape is a shape,
for example.
As depicted in Figure 2, in an embodiment the cutter 20 forms a closed shape.
In a closed shape, there are no gaps in the cutter 20 when viewed in plan. As
depicted in Figure 2, the cutter 20 may comprise a single blade 10. The single blade
may form a closed shape.
However, the shape formed by the cutter 20 is not necessarily absolutely
closed. The shape may comprise one or more gaps 25. For example, Figure 10
depicts a plan view of a cutter 20 according to an embodiment. The cutter 20
comprises a blade 10 that forms a substantially closed shape. The shape is
substantially closed because there is only a single relatively small gap 25.
Figures 11 and 12 each depict a plan view of a cutter 20. The cutter 20
depicted in Figure 11 comprises two blades 10. Each blade 10 forms an L-shape,
which is a shape that is not closed. The cutter 20 comprises two gaps 25 between the
blades 10. The cutter 20 forms a rectangular shape, which is substantially closed
because the gaps are small. In an embodiment the blades 10 may contact each other
such that there is no gap 25.
The cutter 20 depicted in Figure 12 comprises four blades 10. Each blade 10
forms a straight line, which is not a shape. The cutter 20 forms a rectangular shape,
which is substantially closed because the gaps are small. In an embodiment the
blades 10 may contact each other such that there is no gap 25.
In the following description, an embodiment in which the cutter 20 comprises
a single blade 10 is described. However, it will be understood that the cutter 20 may
comprise more than one blade 10, as set out above.
In a cutting operation, the blade 10 is brought into contact with a surface 15
to be cut. As the blade 10 approaches the surface 15, the first teeth 11 come into
contact with the surface 15 before the second teeth 12. When the first teeth 11 come
into contact with the surface 15, the first teeth 11 apply pressure to the points of
contact between the first teeth 11 and the surface 15. When the second teeth 12
come into contact with the surface 15, the second teeth apply pressure to the surface
at the points of contact between the second teeth 12 and the surface 15. However,
the pressure applied by the first teeth 11 is greater than the pressure applied by the
second teeth 12 because the first teeth 11 are longer than the second teeth 12.
As a result, the pressure along the cutting perimeter is non-uniform. The
elongating stress to the surface 15 is reduced compared to a case in which uniform
pressure is applied along the cutting perimeter, as with a standard serrated blade or a
non-serrated blade. For example, uniform pressure can be applied along the cutting
perimeter if a serrated blade is used in which all of the teeth have substantially the
same length.
When the pressure applied by the first teeth 11 on the surface is sufficiently
great, the first teeth 11 start penetrating the surface 15. Subsequently, the second
teeth 12 penetrate the surface 15. The cut along the cutting perimeter of the surface
is completed as the blade 10 continues to move through the surface 15. Accordingly,
described is a serrated blade 10 that can cut through a surface 15 to be cut in an
efficient way.
In particular, described is a blade 10 that addresses the problem of the surface
stretching during the cutting operation. If the surface 15 stretches, then the
surface 15 may not be completely cut, or the blade 10 may be required to move a
greater distance beyond the starting line of the surface 15 (i.e. through the surface
) so as to complete the cut.
This problem can be particularly acute for die cutting operations. A die
cutting operation is a cutting operation in which a blade that forms a closed shape
cuts a surface 15 to be cut. A die cutting operation is contrasted with a straight
cutting operation. In a straight cutting operation, a straight line is cut in a surface to
be cut by a blade. In a straight cutting operation, stretching of the surface during the
cutting operation can be effectively reduced by applying tension to the surface during
the cutting operation. For example, if the surface to be cut is a type of plastic film,
then the plastic film can be stretched out before the blade comes into contact with the
plastic film. In this way, the plastic film stretches by a reduced amount during the
straight cutting operation.
However, in a die cutting operation, it is significantly more difficult to reduce
the stretching of the plastic film by applying tension to the plastic film before the
cutting takes place. Hence, the factors involved in making clean cuts in straight
cutting operations are different from the factors involved in making clean cuts in die
cutting operations.
In an embodiment the first teeth 11 are interspersed with second teeth 12 of
the plurality of second teeth 12. Accordingly, it is possible to avoid applying
uniform pressure along the cutting perimeter of the surface 15 to be cut. This
reduces elongation of the surface 15 to be cut which would otherwise hinder the
cutting process.
The serrated blade 10 may comprise at least as many second teeth 12 as first
teeth 11. In this case, at least one second tooth 12 may be disposed between each
pair of adjacent first teeth 11. In an embodiment, the serrated blade 10 may comprise
at least as many first teeth 11 as second teeth 12. In this case, there may be at least
one first tooth 11 disposed between each pair of adjacent second teeth 12. In an
embodiment, the blade 10 comprises a substantially equal number of first teeth 11 as
second teeth 12. In this case, the first teeth 11 and second teeth 12 may be arranged
alternately along the blade 10.
In an embodiment the first teeth 11 are longer than the second teeth 12 by a
distance within the range of from about 0.5 mm to about 1.0 mm. Accordingly, the
difference in teeth length is sufficiently great that the pressure applied along the
cutting perimeter is sufficiently non-uniform so as to reduce undesirable stretching of
the surface 15 to be cut during the cutting operation.
Furthermore, the difference in length between the teeth is sufficiently small
that the blade 10 is required to move a relatively small distance relative to the surface
15 to be cut in order to perform the cutting operation. This improves the cleanness of
the cut, thereby improving its aesthetic appearance. If the difference in teeth length
were large, then the blade would have to move a large distance in order for the
second teeth to come into contact with the partially-stretched film to perform the
cutting.
In an embodiment the first teeth 11 have a length of at least 3 mm. In an
embodiment the first teeth 11 have a length of at most 4 mm. In an embodiment the
first teeth 11 have a length of about 4 mm. In an embodiment all of the first teeth 11
have substantially the same length as each other such that in use all of the first teeth
11 contact a surface 15 to be cut at substantially the same time. However, there may
be slight variations between the lengths of the first teeth 11 within manufacturing
tolerances.
In an embodiment a plurality of the plurality of second teeth 12 have a length
of at least 2 mm, optionally at least 2.5 mm and optionally at least 3 mm. In an
embodiment a plurality of the plurality of second teeth 12 have a length of at most
3.5 mm and optionally at most 3 mm. In an embodiment a plurality of the plurality
of second teeth 12 have a length of about 3 mm.
In an embodiment all of the second teeth 12 have substantially the same
length as each other such that in use all of the second teeth 12 contact a surface 15 to
be cut at substantially the same time. However, there may be slight variations
between the lengths of the second teeth 12 within manufacturing tolerances.
Furthermore, as explained below, the second teeth 12 may comprise a plurality of
sets of teeth having different lengths.
In an embodiment the first teeth 11 are longer than the second teeth 12 by a
distance of at least 0.5 mm and optionally at least 0.7 mm. The larger the difference
in length between the first teeth 11 and the second teeth 12, the less uniform the
pressure that is applied along the cutting perimeter. This helps to cut through thin
and stretchable materials particularly.
In an embodiment the first teeth 11 are longer than the second teeth 12 by a
distance of at most 1 mm. The greater the difference in length between the first teeth
11 and the second teeth 12 the further the blade 10 has to be move relative to the
surface 15 to be cut in order to perform the cutting operation. Even with a long
distance travelled by the blade 12 relative to the surface 15 to be cut, the cutting
operation can be completed. However, the greater the distance travelled, the
aesthetic appearance of the cut can be reduced. This is because the surface 15 may
stretch during the cutting operation such that after the cut has been completed, the
surface 15 remains stretched undesirably.
In an embodiment the first teeth 11 are longer than the second teeth 12 by a
distance of about 1 mm.
In an embodiment a ratio of a length of the first teeth 11 to the length of the
second teeth 12 is at least 8:7 (or about 1.15 expressed fractionally). In an
embodiment the ratio of the length of first teeth 11 to the length of the second teeth
12 is at most 3:2 (or about 1.50 expressed fractionally). In an embodiment the ratio
of the length of the first teeth 11 to the length of the second teeth 12 is about 4:3 (or
about 1.35 expressed fractionally). Here, the fractions are expressed to the nearest
0.05.
If the ratio is too great, then there is a possibility that the first teeth 11 are so
far apart from each other that the surface 15 to be cut merely bends when contacted
by the first teeth 11 but is not cut. This undesirable effect can be overcome by
providing first teeth 11 having a very narrow angle A1 at their tip so that they can be
arranged closer together. However, this makes the first teeth 11 more susceptible to
breakage.
Additionally, if the ratio is too great, then the first teeth 11 may have
penetrated the surface 15 such that they no longer apply pressure to the surface 15
when the second teeth 12 come into contact with the surface 12. In this case, the
effect of applying non-uniform pressure along the surface 15 is reduced.
As depicted in Figure 1, the length of each tooth is measured from the tip of
the tooth to the root of the tooth. The length is measured in the direction in which
the blade moves so as to perform the cutting operation. As shown in Figure 1, this is
the Y-direction. The root of the tooth is the position at which the tooth joins the base
portion of the blade 10. The base portion of the blade is substantially solid and
rectangular and is not serrated. The root of the tooth is level with the points 21 at
which pairs of adjacent teeth separate from each other at a gap in the blade 10 in the
X-direction as shown in Figure 1.
In Figure 1, reference numeral 21 refers to a point at which two adjacent teeth
are separated from each other. The length of each tooth is measured from point 21 to
the tip of the tooth in the Y-direction. As depicted in Figure 1, in an embodiment
substantially all of the first teeth 11 and substantially all of the second teeth 12 are
positioned between gaps in the X-direction that start at the same point 21 in the Y-
direction. That is, all of the points 21 are at the same position in the Y-direction.
However, this need not be the case. For example, the gaps that form the teeth may
start at different points along the Y-direction. Figure 9 depicts such a structure.
In an embodiment the first teeth 11 are arranged along the blade 10 at an
average interval P1 within the range of from about 5 mm to about 10 mm.
Accordingly, the distance between the first teeth 11 is sufficiently great so as to
reduce the pressure applied on the surface 15 to be cut. This reduces the stretching
of the surface 15 during the cutting operation. The distance between the first teeth is
sufficiently small such that the first teeth 11 can penetrate the surface 15 to be cut so
as to perform the cutting operation effectively.
In Figure 1, the interval at which the first teeth 11 are arranged is denoted by
reference numeral P1. In an embodiment the first teeth 11 are arranged along the
blade at an average interval P1 of at least 5 mm, optionally at least 7 mm and
optionally at least 9 mm. In an embodiment the first teeth 11 are arranged along the
blade at an average interval P1 of at most 10 mm, and optionally at most 7 mm. In
an embodiment the first teeth 11 are arranged along the blade at an average interval
P1 of about 6.5 mm.
In an embodiment the first teeth 11 and/or second teeth 12 are arranged along
the blade at substantially regular intervals. However, the intervals need not be
perfectly regular. For example, there may be slight variations between intervals
within manufacturing tolerances. Furthermore, the intervals may be irregular. In this
case, the intervals may correspond to a repeating pattern, or may be substantially
random.
In an embodiment the blade 10 comprises a substantially equal number of
first teeth 11 and second teeth 12. For example, Figure 1 depicts an embodiment in
which the blade 10 comprises a substantially equal number of first teeth 11 and
second teeth 12. However, this need not be the case. In an embodiment the blade 10
comprises about two times the number of second teeth 12 as first teeth 11.
In an embodiment the blade 10 comprises about three times the number of
second teeth 12 as first teeth 11. Figure 3 depicts such an embodiment. As depicted
in Figure 3, second teeth 12 are disposed along the blade 10 between each pair of
adjacent first teeth 11. The ratio of first teeth to second teeth is not particularly
limited. Accordingly, the ratio of first teeth 11 to second teeth 12 can be chosen so
as to minimize stretching of a film to be cut during a cutting operation.
In an embodiment the plurality of second teeth 12 comprises at least two sets
of teeth that have different lengths such that in use the two sets of teeth contact a
surface 15 to be cut at different times. Figure 3 depicts such an embodiment in
which the plurality of second teeth 12 comprises two sets of teeth having different
lengths. Accordingly, the blade 10 comprises teeth 11, 12 of three different lengths.
Accordingly, during a cutting operation the first teeth 11 contact the surface 15 to be
cut first. The first teeth 11 start penetrating the surface 15. Then, on a second step,
the longer of the two sets of second teeth 12 continue the cutting of the surface 15.
Then, on a third step, the shorter of the two sets of second teeth 12 complete the
cutting of the surface 15 in an efficient way.
The distance between the teeth of the longer set of second teeth 12 can be
chosen so as to minimize pressure on the surface 15 to be cut during the second step
of the cutting operation. This helps to reduce the stretching of the surface 15 during
the cutting operation. In turn, this improves the quality of the cut.
As depicted in Figure 3, in an embodiment the blade 10 comprises about two
times the number of the longer set of second teeth 12 as the shorter set of the second
teeth 12. There may be at least one of the shorter teeth of second teeth 12 disposed
between each adjacent pair of the longer set of second teeth 12. Each first tooth 11
may be positioned between a pair of the longer set of second teeth 12.
In an embodiment each of the first teeth 11 forms a sharp point at its tip. The
tip may have an angle A1, in the plane of the blade 10, within the range of from
about 50° to about 60°. In an embodiment each of the second teeth 12 forms a sharp
point at its tip having an angle A2, in the plane of the blade 10, within the range of
from about 50° to about 60°.
Accordingly, the angle is sufficiently small that the teeth 11, 12 can penetrate
the surface 15 to be cut while reducing the undesirable stretching of the surface 15
during the cutting operation. Furthermore, the angle is sufficiently great the first
teeth 11 can, during the penetration of the surface 15, create a slit that is sufficiently
long as to aid the completion of the cutting operation during the second and
optionally third cutting steps. Additionally, the first teeth 11 continue to apply
pressure on the surface 15 to be cut when the second teeth 12 come into contact with
the surface 15.
The tip angle A1 of the first teeth 11 and the tip angle A2 of the second teeth
12 may be substantially equal to each other. However, this need not be the case. In
an embodiment, the tip angle A1 of the first teeth 11 may be about 50°. The tip
angle A2 of the second teeth 12 may be about 50°, or may be a different angle such
as 55° or 60°.
In an embodiment each of the first teeth 11 and/or each of the second teeth 12
forms a substantially triangular shape. The triangular shape provides a sharp tip.
However, other shapes of teeth are possible and the shape is not particularly limited.
The teeth 11, 12 need not have a sharp tip. For example, other shapes of teeth that
are possible are a rectangle or a semi-circle.
Figure 4 depicts a cross-section of the blade 10 across the thickness of the
blade. The X-direction of Figure 1 corresponds to the direction into and out of the
page in Figure 4. In an embodiment the thickness T of the blade tapers towards the
tips of the first teeth 11 and/or towards the tips of the second teeth 12. Accordingly,
the sharpness of the blade can be improved. The blade 10 may have sharp singular
points at which it comes into contact with a surface 15 to be cut. This helps
penetration of the surface 15 by the blade 10.
In an embodiment, the tapering angle A3 is at least about 10°, and optionally
at least about 15°. In an embodiment the tapering angle A3 is at most about 30°, and
optionally at most about 20°. In an embodiment the tapering angle A3 is about 17°.
Accordingly, the tapering angle A3 is sufficiently low so that the blade 10 of
the cutter 20 is sharp, thereby penetrating the surface 15 more easily. Furthermore,
the tapering angle A3 is sufficiently high so that the blade 10 is durable. If the
tapering angle A3 is to low, then the tip of the blade 10 becomes more easily broken.
This is particularly a danger because the blade 10 may come into contact with the
tray 81 during a cutting operation, the tray 81 being harder than the film 82.
In an embodiment the thickness T of the blade is in the range of from about
0.8 mm to about 2 mm, and preferably about 1.0 mm. Here, the thickness T of the
blade is measured in the base portion of the blade 10, and not in the tapering portion
of the blade 10.
Figure 5 depicts a blade according to an embodiment. Figure 4 and Figure 5
may depict the same blade 10 viewed from different angles. The hatched section of
the blade 10 depicted in Figure 5 corresponds to the tapered portion of the blade 10.
Figure 4 is a cross-section taken along line Z in Figure 5.
According to the present invention, there is provided a packaging apparatus 1
comprising the cutter 20. Accordingly, the blade 10 can be used to perform clean
cuts in packaging processes.
In an embodiment, the packaging apparatus 1 comprises an actuator 71. The
actuator 71 is configured to move the blade 10 in a cutting operation. The packaging
apparatus 1 is configured such that the actuator 71 moves the blade 10 by a
maximum distance within the range of from about 5 mm to about 15 mm.
Accordingly, the blade 10 may be moved by a sufficient distance so as to
perform a complete cut of the surface 15 to be cut. Furthermore, the movement of
the blade 10 relative to the surface 15 to be cut is limited such that the aesthetic
appearance of the completed cut is improved. In particular, if a large relative
movement between the blade 10 and the surface 15 occurs, then the cut may have an
undesirable appearance.
In an embodiment, the packaging apparatus is configured such that the
actuator 71 moves the blade 10 by a maximum distance of at least 5 mm. In an
embodiment, the packaging apparatus 1 is configured such that the actuator 71
moves the blade 10 by a maximum distance of at most 15 mm. The actuator 71 may
comprise a motor to drive the blade 10 during a cutting operation. However, the type
of actuator 71 is not particularly limited.
In an embodiment the packaging apparatus 1 comprises a sealer 72. The
sealer 72 may be a heat sealer. The sealer 72 is configured to seal a film to a tray.
Accordingly, the blade 10 can be used in the context of a packaging apparatus 1 that
applies film lids to trays. The trays may be used to package food.
The tray 81 may be formed of a foam material, or may be formed from a solid
plastic sheet, for example. The film 82 is sealable, preferably heat sealable. In an
embodiment, the film 82 comprises a heat sealable polyolefin, preferably a
polyethylene material.
The packaging apparatus 1 may comprise a tray lidding machine 60, as
depicted in Figure 6, for example. In an embodiment the tray lidding machine 60
comprises a support section 62 and a cut/seal section 61.
The support section 62 is configured to support at least one tray 81. The
support section 62 may support three or five trays 81, for example, the exact number
not being particularly limited. The support section 62 comprises compartments
configured to hold and position the tray 81 in a predefined position.
The cut/seal section comprises the blade 10 and a sealer 72. A film 82 is
suspended above the tray 81. During a tray lidding operation, the cut/seal section 61
is brought together with the support section 62. The blade 10 and sealer 72 cut and
seal, respectively, the film 82 to the tray 81 to form a lid.
Figure 7 depicts a part of a packaging apparatus 1 according to an
embodiment of the invention. An exemplary operation of the apparatus depicted in
Figure 7 is set out below.
The film 82 is suspended above the tray 81. An actuator actuates the sealer
72 such that the sealer 72 presses the film 82 onto the tray 81. Accordingly, the film
82 forms the lid of the packaging that is to be formed.
The actuator 71 moves the blade 10 so as to cut the film 81. The blade 10 is
configured to cut the film 82 so as to form the desired shape of the lid of the food
packaging.
For example, as depicted in Figure 2, the blade 10 may form a rectangular
shape. The rectangular shape may optionally have rounded corners. In an
embodiment the blade has a width TW, in plan view, within the range of from about
10cm to about 50cm. In an embodiment the blade has a length TL, in plan view,
within the range of from about 15cm to about 75cm.
However, other shapes are also possible, depending on the desired shape of
the lid. In particular, the blade may form a circular or oval shape. The lid may have
substantially the same shape as the tray 81. Hence, the blade 10 can be designed to
form a shape that matches the shape of the tray 81.
The actuator 71 that actuates the sealer 72 may be the same as the actuator
that actuates the blade 10. However, this need not be the case. For example, a
separate actuator may be used to move each of the sealer 72 and the blade 10.
The film 82 may be sealed to the tray 81 either before or after the film 82 is
cut by the blade 10. As depicted in Figure 7, in an embodiment the film 82 is sealed
to the tray 81 before the film 82 is cut by the blade 10. As depicted in Figure 8, in an
embodiment the film is cut by the blade 10 before the film 82 is sealed to the tray 81
by the sealer 72.
The sealer 72 may be configured to seal the film 82 to the tray 81 by heating
the film 82 to the tray 81. In an embodiment a sealer 72 is configured to heat to a
temperature within the range of from about 100° Celsius to about 220° Celsius so as
to seal the film 82 to the tray 81. Accordingly, the blade 10 can be used to efficiently
cut a film 82 that has undergone heating. This is significant because when a film 82
is heated, it can before even more stretchable than normal. As such, a heated film 82
is more susceptible to undergo undesirable elongation and/or stretching during a
cutting operation. Hence, a heated film 82 can be more difficult to cut than a non-
heated film. The blade 10 has been found to be able to cut thin and stretchable films
even after they have undergone heating.
In an embodiment, the packaging apparatus 1 comprises at least one
insulating plate 83 configured to insulate the blade 10 from the sealer 72. The
insulating plate 83 reduces the heat energy absorbed by the blade 10, thereby
reducing the temperature of the blade 10 in operation. This reduces the heating
effect of the film 82 during the cutting operation by the blade 10.
However, even with an insulating plate 83, the blade 10 may reach a
temperature within the range of about 60° Celsius to about 170° Celsius. In an
embodiment, the blade 10 is formed from a metal. The blade 10 is formed from a
metal that can withstand a temperature of at least 100° Celsius. The metal may be
stainless steel, for example. Other types of metal may also be suitable.
In an embodiment the sealer 72 comprises a shape that corresponds
substantially to the shape of the outline of the tray 81. Hence, as the sealer 72
presses the film 82 against the tray 81, the sealer 72 seals the film 81 to the border of
the frame of the tray 81.
As depicted in Figure 7, in an embodiment the sealer 72 is attached to a frame
75 of the packaging apparatus 1 by at least one spring 84. When the sealer 72 presses
the film 82 against the tray 81, the at least one spring 84 compresses. Subsequently
the blade 10, which may be connected either directly or indirectly to the same frame
75 as the sealer 72, comes into contact with the film 82 sealed on the tray 81. The
blade 10 cuts the film 82.
Alternatively, as depicted in Figure 8, in an embodiment the blade 10 is
connected to a frame 75 of the packaging apparatus 1 either indirectly or directly by
at least one spring 85. When the blade 10 and the tray 81 move towards each other,
the blade 10 presses the film 82 against the tray 81 and cuts the film 82.
Subsequently, the tray 81 prevents further movement of the blade 10 and the at least
one spring 85 compresses. Subsequently, the sealer 72 presses the cut film 82
against the tray 81 and seals it.
Alternatively, the seal and cut steps described for Figures 7 and 8 above may be
performed by raising the support section 62 rather then by lowering the cut/seal
section 61 of the packaging apparatus 1 or by a combination of both the movements.
During the cutting operation, the blade 10 may come into contact with the
tray 81 itself. Hence, the blade 10 should be durable so as to maintain structural
integrity during contact with the tray 81. The first teeth 11 penetrate the film 82
before the film 82 is completely cut through. It is possible that the first teeth 11
begin to cut through the tray 81 during the cutting operation.
The blade 10 is particularly advantageous when used to cut thin and
stretchable film 82. This may be the case when the blade 10 is used, for example, in
the context of a tray lidding machine 60.
In an embodiment the packaging apparatus 1 comprises a film dispenser 65
configured to dispense film 82. The film dispenser 65 may be configured to dispense
film 82 that has a thickness of less than about 30 μm, optionally less than about 25
μm, optionally less than about 20 μm, and optionally about 15 μm or less.
In an embodiment the film 82 has a Young’s modulus of less than about
100,000 MPa. The packaging apparatus 1 is configured such that the serrated blade
cuts the film 82. Accordingly, the blade 10 can be used to efficiently cut through
a film 82 that is thin and/or stretchable.
In an embodiment the film 82 has a Young’s modulus of less than about
60,000 MPa, optionally less than about 50,000 MPa and optionally less than about
,000 MPa. In an embodiment the film has an elastic modulus of about 60,000
MPa, about 50,000 MPa, or about 25,000 MPa. The elastic modulus is measured at a
temperature of 23°C using standard techniques (ASTM D-883).
In an embodiment the film 82 may have an elongation of at least 60%, and
optionally at least 80%. The elongation corresponds to the strain of the material
(expressed as a percentage of the starting length) when a force is applied to a length
of the material at the time when the material breaks (ASTM D-882).
In an embodiment the film 82 comprises a material that has a tensile strength
of less than about 11,000 MPa, optionally less than about 9,000 MPa, and optionally
about 8,500 MPa (ASTM D-882).
Exemplary materials that may be used to form the film 82 and their
associated properties are set out below in Table 1.
Table 1
Material Sample A Sample B Sample C
Thickness / μm 25 21 15
Elongation / % 60-80 80-100 70
Elastic Modulus at 56 41-46 23-24
23°C / GPa
Tensile Strength / MPa 8.5 7.0-9.0 9.0-10.5
Sample A is a polyethylene based barrier film that comprises polyamide,
described in EP236099. The polyamide gives stiffness to the film. Sample B,
described in WO2011029950, and Sample C, described in US5942326, are
polyethylene based materials. The Sample B is known to be particularly soft. The
Sample C material is known to be particularly stretchable.
Using the blade 10, a film 82 comprising any of these exemplary materials
can be cut, providing a clean cut. The tests were performed using the tray lidding
machine Mondini 380 in the context of sealing lids onto foam trays. The blade 10
can cut these films 82 which are thin and stretchable even when the film 82 is sealed
by heat to the tray 81 prior to the blade 10 cutting through the film. A cut that has a
pleasing aesthetic appearance can be achieved.
In this specification where reference has been made to patent specifications, other
external documents, or other sources of information, this is generally for the purpose
of providing a context for discussing the features of the invention. Unless
specifically stated otherwise, reference to such external documents is not to be
construed as an admission that such documents, or such sources of information, in
any jurisdiction, are prior art, or form part of the common general knowledge in the
art.
In the description in this specification reference may be made to subject
matter which is not within the scope of the claims of the current application. That
subject matter should be readily identifiable by a person skilled in the art and may
assist in putting into practice the invention as defined in the claims of this
application.
The term “comprising” as used in this specification and claims means
“consisting at least in part of”. When interpreting statements in this specification and
claims which include the term “comprising”, other features besides the features
prefaced by this term in each statement can also be present. Related terms such as
“comprise” and “comprised” are to be interpreted in similar manner.
Claims (19)
1. A packaging apparatus comprising a cutter for cutting a film, the cutter forming a shape and comprising at least one blade, each blade comprising: a plurality of first teeth; and a plurality of second teeth; wherein the first teeth are longer than the second teeth such that in use the first teeth contact a surface of the film to be cut before the second teeth and wherein the cutter forms a closed or substantially closed shape.
2. The packaging apparatus of claim 1, wherein the first teeth are interspersed with second teeth of the plurality of second teeth.
3. The packaging apparatus of any of the preceding claims, wherein the cutter comprises two blades, each blade forming an L-shape such that the cutter forms a substantially closed rectangular shape with small gaps or a closed rectangular shape with no gaps; or wherein the cutter comprises four blades, each blade forming a straight line such that the cutter forms a substantially closed rectangular shape with small gaps or a closed rectangular shape with no gaps.
4. The packaging apparatus of any of the preceding claims, wherein the first teeth are longer than the second teeth by a factor within the range of from about 1.15 to about 1.50.
5. The packaging apparatus of any of the preceding claims, wherein: the at least one blade comprises a substantially equal number of first teeth and second teeth; or the at least one blade comprises about three times the number of second teeth as first teeth.
6. The packaging apparatus of any of the preceding claims, wherein the plurality of second teeth comprises at least two sets of teeth that have different lengths such that in use the two sets of teeth contact a surface of the film to be cut at different times.
7. The packaging apparatus of any of the preceding claims, wherein each of the first teeth and/or each of the second teeth forms a sharp point at its tip having an angle, in the plane of the blade, within the range of from about 50 degrees to about 60 degrees.
8. The packaging apparatus of any of the preceding claims, wherein the thickness of the at least one blade tapers towards the tips of the first teeth and/or towards the tips of the second teeth.
9. The packaging apparatus of any one of the preceding claims, further comprising an actuator configured to move the cutter in a cutting operation, wherein the packaging apparatus is configured such that the actuator moves the cutter by a maximum distance within the range of from about 5mm to about 15mm.
10. The packaging apparatus of any one of the preceding claims, further comprising a sealer configured to seal the film to a tray, wherein optionally the packaging apparatus is configured such that in a packaging operation, the film is sealed to the tray before the film is cut by the cutter.
11. The packaging apparatus of claim 10, wherein the sealer is configured to heat to a temperature within the range of from about 100 degrees Celsius to about 220 degrees Celsius so as to seal the film to the tray.
12. The packaging apparatus of any one of the preceding claims, further comprising a film dispenser configured to dispense film that has a thickness of less than about 30 micrometers and/or a Young’s modulus of less than about 100,000 MPa, wherein the packaging apparatus is configured such that the cutter cuts the film.
13. A method of cutting a film comprising the steps of: providing a cutter forming a shape and comprising at least one blade, each blade comprising a plurality of first teeth and a plurality of second teeth, wherein the first teeth are longer than the second teeth and wherein the cutter forms a closed or substantially closed shape; and cutting the film with the cutter such that the first teeth contact the film before the second teeth.
14. The method of claim 13, wherein the second teeth start penetrating the film before the film is completely cut.
15. The method of claim 13 wherein cutting comprises forming a film lid, which is applied to a tray.
16. The method of claim 13 wherein the film is a stretchable film.
17. Use of the packaging apparatus of any one of claims 1 to 12 in the context of tray lidding.
18. The packaging apparatus according to any one of claims 1 to 8, wherein the apparatus is configured as a tray lidding machine having: a support section configured to support at least one tray and a cut/seal section comprising said cutter and a sealer, wherein - during a tray lidding operation - the cut/seal section is configured to be brought together with the support section such that the cutter and sealer cut and seal, respectively, the film to the tray to form a lid.
19. A packaging apparatus, according to claim 1, substantially as herein described with reference to any one or more of the accompanying
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP20110189494 EP2594496B1 (en) | 2011-11-17 | 2011-11-17 | Packaging apparatus comprising a cutter for cutting a film |
EP11189494.5 | 2011-11-17 |
Publications (2)
Publication Number | Publication Date |
---|---|
NZ603632A NZ603632A (en) | 2014-06-27 |
NZ603632B2 true NZ603632B2 (en) | 2014-09-30 |
Family
ID=
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