NZ714305A - Improved shrink wrap packaging 2 - Google Patents
Improved shrink wrap packaging 2Info
- Publication number
- NZ714305A NZ714305A NZ714305A NZ71430515A NZ714305A NZ 714305 A NZ714305 A NZ 714305A NZ 714305 A NZ714305 A NZ 714305A NZ 71430515 A NZ71430515 A NZ 71430515A NZ 714305 A NZ714305 A NZ 714305A
- Authority
- NZ
- New Zealand
- Prior art keywords
- film
- film region
- region
- shrink wrap
- sleeve
- Prior art date
Links
- 238000004806 packaging method and process Methods 0.000 title description 11
- 235000013361 beverage Nutrition 0.000 claims description 17
- 238000010438 heat treatment Methods 0.000 claims description 6
- 238000005520 cutting process Methods 0.000 claims description 4
- 241000042032 Petrocephalus catostoma Species 0.000 claims 1
- 229920000098 polyolefin Polymers 0.000 description 9
- 210000004080 Milk Anatomy 0.000 description 7
- 235000013336 milk Nutrition 0.000 description 7
- 239000008267 milk Substances 0.000 description 7
- 229920000915 polyvinyl chloride Polymers 0.000 description 6
- 239000004800 polyvinyl chloride Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 229920003023 plastic Polymers 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 210000001624 Hip Anatomy 0.000 description 3
- 210000003127 Knee Anatomy 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 235000013305 food Nutrition 0.000 description 3
- 238000003780 insertion Methods 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- -1 polyethylene Polymers 0.000 description 3
- 239000004698 Polyethylene (PE) Substances 0.000 description 2
- 210000001138 Tears Anatomy 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000005755 formation reaction Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006011 modification reaction Methods 0.000 description 2
- 239000004014 plasticizer Substances 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 235000014214 soft drink Nutrition 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-N HCl Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 1
- 206010022114 Injury Diseases 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 235000012206 bottled water Nutrition 0.000 description 1
- 235000013351 cheese Nutrition 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 235000013312 flour Nutrition 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- IXCSERBJSXMMFS-UHFFFAOYSA-N hydrogen chloride Substances Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 description 1
- 229910000041 hydrogen chloride Inorganic materials 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 235000013372 meat Nutrition 0.000 description 1
- 235000020124 milk-based beverage Nutrition 0.000 description 1
- 239000000123 paper Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- OZAIFHULBGXAKX-UHFFFAOYSA-N precursor Substances N#CC(C)(C)N=NC(C)(C)C#N OZAIFHULBGXAKX-UHFFFAOYSA-N 0.000 description 1
- 230000001681 protective Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000001340 slower Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
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- 235000013311 vegetables Nutrition 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Abstract
The present invention provides improved shrink wrapped films.
Description
IMPROVED SHRINK WRAP PACKAGING 2
FIELD OF THE INVENTION
The present invention is directed to the shrink wrapping of multiple items to allow for unitized
handling. More particularly, the invention relates to shrink wrap sleeves that facilitate
unitized handling of the items and are also more economical to produce.
BACKGROUND TO THE INVENTION
Shrink wrapping is a familiar method of packaging goods that has been well used for
decades. Generally, a polymer film is arranged about the product(s) to be packaged, and
heat applied subsequently by a heat gun or passing through a shrink tunnel or oven.
Application of heat causes the film to constrict around the product(s).
Shrink wrap can be supplied in several forms. Flat rollstock can be wrapped around a
product, often with heat sealing to tack the film together. Centerfolded film is supplied on a
roll with the plastic is folded in half: product is placed in the center portion, the remaining
three edges are sealed to form a bag, and the package then heated which causes the bag to
shrink and conform to the product placed in the bag. Pre-formed shrink bags plastic bags are
used with one end open: the product is placed in the bag, sealed, and sent for heat
shrinking.
Shrink wrap is commonly used as an overwrap on many types of packaging, including
cartons, boxes, beverage cans and pallet loads. A variety of products may be enclosed in
shrink wrap to stabilize the products, unitize them, maintain cleanliness or add tamper
resistance. It can be the primary covering for some foods such as cheese, meats,
vegetables and plants.
Shrink wrapping is commonly used to unitize multiple containers for beverages such as
bottled water, soft drink, milk and the like. A problem arises when the individual containers
must be removed, as required when stocking a supermarket shelf, for example. It is a
problem that when unwrapping products unitized by shrink wrapping, it is necessary to cut
the wrapping with a knife (or similar instrument) or to tear the film to release the individual
items. This adds time, and slows the throughput of supermarket shelf stocking personnel.
The use of a knife also provides an occupational health and safety hazard.
Unitized shrink wrapped products may also be difficult to lift and carry, especially where
multiple beverage products are involved. It is typically necessary for the handler to lean
40 forward, insert the fingers under the package and elevate it to waist height by straightening
the back. This leads to significant strain on the back, and may lead to a work place injury.
For example, where 6 x 2 litre milk containers are unitized, the package weight is 12 kg.
A further problem is the cost of shrink wrapping. While convenient (there is no need to
45 incorporate crates into the supply chain, for example) it is a costly method. This is especially
the case for large items of relatively low value (such as beverages) where the cost of shrink
wrapping is ideally minimised to maintain or increase profit.
It is an aspect of the present invention to overcome of ameliorate a problem of the prior art
50 by providing improved shrink wrap packaging, and also methods for applying shrink wrap
film.
It is a further aspect to provide an alternative to prior art shrink wrap packaging and methods
for application.
The discussion of documents, acts, materials, devices, articles and the like is included in this
specification solely for the purpose of providing a context for the present invention. It is not
suggested or represented that any or all of these matters formed part of the prior art base or
were common general knowledge in the field relevant to the present invention as it existed
60 before the priority date of each claim of this application.
SUMMARY OF THE INVENTION
65 In a first aspect, the present invention provides a shrink wrap sleeve for unitizing two or more
items, the sleeve comprising a first film region and a second film region, the first film region
having an area less than that of the second film region.
In one embodiment, the area of the first film region is less than about 90%, 80%, 70%, 60%,
70 50%, 40%, 30%, 20% or 10% of that of the second film region.
In one embodiment the area is of the first film region is less than about 60% of that of the
second film region. In another embodiment the area is of the first film region is about 50% of
that of the second film region.
In one embodiment the first and second film regions are discrete films bonded along at least
one edge. In another embodiment the first and second film regions are discrete films
bonded along two edges. A further embodiment provides that the two edges are opposite
each other and/or substantially parallel to each other.
In one embodiment, the length of the first film region substantially identical to that of the
second film region
In one embodiment a dimension of the first film region is less than that of the second film
85 region.
In one embodiment the width of the first film region is less than about 90%, 80%, 70%, 60%,
50%, 40%, 30%, 20% or 10% of that of the second film region. In another embodiment the
width of the first film region is less than about 60% of that of the second film region. A
90 further embodiment provides that the width of the first film region is about 50% of that of the
second film region.
In one embodiment, the first film region is longer than the second film region such that when
the sleeve is laid flat, the first film region does not lay flush against the first film region.
In one embodiment, the first film region is at least about 110% the length of the second film
region.
In one embodiment when superimposed, the first film region is substantially central with
100 respect to the second film region.
In one embodiment the first film region (when shrunk) has a greater resistance to
mechanical deformation than the second film region (when shrunk). In another embodiment
the first film region has a thickness greater than that of the second film region. The first film
105 region may have a thickness at least about 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, or
50% greater than the second film region.
In one embodiment the first film region has a thickness of greater than about 60 µm and/or
the second film region has a thickness of less than about 60 µm. In another embodiment the
110 first film region has a thickness of between about 60 µm to 80 µm, and the second film
region has a thickness of between about 40 µm to 60 µm. Yet a further provides that the first
film region has a thickness of greater than about 80 µm and/or the second film region has a
thickness of less than about 80 µm. Still a further embodiment provides that the first film
region has a thickness of between about 80 µm to 100 µm, and the second film region has a
115 thickness of between about 60 µm to 80 µm.
In one embodiment of the shrink wrap sleeve, the first and second film regions are shaped,
dimensioned or otherwise configured so as to form a basket-like arrangement upon shrinking
around two or more products.
In a second aspect the present invention provides a method for unitizing two or more
products, the method comprising the steps of: providing two or more products; providing a
first length of film; providing a second length of film, the second length of film being wider
than the first length of film; disposing the two or more products between the first and
125 second lengths of film; bonding the edges of the first and second lengths of film to form a
sleeve; and heating the first and second lengths of film such that the lengths of film contract
about the two or more products.
In one embodiment of the method, the two or more products are disposed between the first
130 and second lengths of film before the step of bonding.
In one embodiment of the method, the two or more products are beverage containers.
In one embodiment of the method, each of the beverage containers is capable of containing
135 at least about 1 litre, or at least about 2 litres.
In one embodiment the method comprises the step of cutting the first and second lengths of
film to form an isolated sleeve, the cutting step being performed before, or
contemporaneously with, the heating step.
In one embodiment of the method, the first length of film and/or second length of film has a
characteristic as described herein.
In a third aspect the present invention provides a shrink wrapped product produced the
145 method as described herein.
BRIEF DESCRIPTION OF THE FIGURES
Fig. 1A shows diagrammatically a prior art shrink wrap sleeve having two open ends and first
and second regions of film. The first and second regions are of equal area.
Fig. 4B shows the same sleeve of Panel A after the application of heat.
Fig. 1C shows diagrammatically a shrink wrap sleeve of the present invention having two
open ends and first and second regions of film. The first region has an area which is less
than that of the second region. Fig. 1D D shows the same sleeve of Fig. 1C after the
application of heat.
Fig. 2 is a drawing of unitized packages holding beverage containers, produced using the
sleeveshown in Figs. 1C, 1D and 3.. Rigid carry handles are inserted beneath the first film
region.
165 Fig. 3 is a diagram (in plan view) of a sleeve of the present invention, laid flat and devoid of
product.
Fig. 4A shows diagrammatically a prior art shrink wrap sleeve having two open ends and first
and second regions of film. The first and second regions are of equal area.
Fig. 4B shows the same sleeve of Fig. 4A after the application of heat.
Fig. 4C shows diagrammatically a shrink wrap sleeve of the present invention having two
open ends and first and second regions of film. The first region has an area which is less
175 than that of the second region.
Fig. 4D shows the same sleeve of Panel 4C after the application of heat.
Fig. 5 is a drawing of unitized packages holding beverage containers, produced using a
180 sleeve shown in Figs. 4C, 4D and 6. Rigid carry handles are inserted beneath the first film
region.
Fig. 6 is a diagram (in plan view) of a sleeve of the present invention, laid flat and devoid of
product, where the first film region is longer than the second film region.
Fig. 7 is a diagram (in plan view) of a sleeve of the present invention, laid flat and devoid of
product, where the first film region is longer than the second film region. The first film region
is longer than the first film region of the embodiment of Fig. 6, with the dimensions of second
film region being identical to those of the second film region of the embodiment of Fig. 6.
DETAILED DESCRIPTION OF THE INVENTION
After considering this description it will be apparent to one skilled in the art how the invention
195 is implemented in various alternative embodiments and alternative applications. However,
although various embodiments of the present invention will be described herein, it is
understood that these embodiments are presented by way of example only, and not
limitation. As such, this description of various alternative embodiments should not be
construed to limit the scope or breadth of the present invention. Furthermore, statements of
200 advantages or other aspects apply to specific exemplary embodiments, and not necessarily
to all embodiments covered by the claims.
Throughout the description and the claims of this specification the word “comprise” and
variations of the word, such as “comprising” and “comprises” is not intended to exclude other
205 additives, components, integers or steps.
Reference throughout this specification to “one embodiment” or “an embodiment” means that
a particular feature, structure or characteristic described in connection with the embodiment
is included in at least one embodiment of the present invention. Thus, appearances of the
210 phrases “in one embodiment” or “in an embodiment” in various places throughout this
specification are not necessarily all referring to the same embodiment, but may.
In a first aspect the present invention provides a shrink wrap sleeve for unitizing two or more
items, the sleeve comprising a first film region and a second film region, the first film region
215 having an area less than that of the second film region. The present invention is a significant
departure from prior art shrink wrap sleeves in which the upper and lower film layers are
substantially the same size.
As used herein, the term “sleeve” (and variations thereof) is intended to include any tube-like
220 form. The film forming the sleeve may be formed without joins, have two joins, or even
multiple joins. Typically, the sleeve is formed by joining together two sheets of film: a first
piece of film disposed above a second piece of film with the two sheets bonded along two
sides (often by a welding method) to form a structure having two open ends.
225 In one embodiment, a join between the two sheets of film may be configured to facilitate
opening the shrink wrapped products. This may be achieved by the join being
discontinuous, such that a space is left allowing a finger (or other implement) to be inserted
between the two sheets to facilitate tearing of the film along or about the join. Alternatively,
the join many be configured to be frangible or otherwise easily breakable at one or more
230 points along the join.
As used herein, the term “unitizing” (and variations thereof) includes any method for bringing
together two or more items, such that the items may be handled as one. The unitization may
further result in a protective function, but this function is not necessary in the context of the
235 invention.
The term “film region” (and variations thereof) is intended to be constructed broadly, and not
limited to a situation where a clear demarcation exists between two or more regions of film.
A precise demarcation line is not required in the context of the present invention, with some
240 embodiments having a graduation between the film regions.
The implementation of two regions of different size is in direct contrast to the prior art, and
provides significant advantage. In particular, the use of a region having a relatively small
area on an uppermost region of the sleeve provides for each of the unitized items to be
245 easily released from the shrink wrapping, and without the need to tear or cut the sleeve.
This ease of release is afforded by the formation of a larger end hole, compared with the
prior art. The larger end hole requires, in some embodiments, only gentle stretching of the
sleeve film or the manipulation of the product in order for the top of the product to clear the
edge of the end hole. Reference is made to Fig. 1 which shows a comparison of end holes
250 formed by the shrink wrapping of consumer milk containers using a prior art sleeve (Panel A:
before heat application; Panel B: after heat application), and using a sleeve of the present
invention (Panel C: before heat application; Panel D after heat application).
It will be noted that the end hole of the prior art package is relatively small, with the vast
255 majority of the external surfaces of the containers enclosed being covered by the film. It will
be clear that the area about the end hole must be cut or torn to release any one of the
enclosed containers.
By contrast, the end hole formed when a sleeve of the present invention is used is relatively
260 large with a much smaller proportion of the external surfaces of the milk containers being
covered the film. It will be appreciated that the lid region of a container is easily released by
slightly stretching the film about the container lids and angling the container so that the lid
region passes under an upper edge of the end hole. Once the first container is released in
this way, any subsequent containers may be released without any stretching of the film (or
265 minimal stretching) given the extra room made by the removal of the first container.
The provision of a relatively large end hole affords a further advantage in that a great volume
air is allowed to circulate between the individual beverage containers. Where the beverage
is refrigerated (such as is the case with milk) the greater opportunity for refrigerated air to
270 contact the external surfaces of the containers allows for more rapid and/or more complete
cooling of the contents.
In one embodiment, the sleeve (when shrunk about a number of products to form a
package) is configured to provide an end hole having an area of greater than about 10%,
275 20%, 30%, 40%, 50%, 60%, 70%, 80% or 90% the total surface area of the package.
Preferably, the end hole has an area of greater than about 50% the total surface area of the
package. Where two or more end holes result from the shrink wrapping process the
combined surface are of the end holes is greater than about 10%, 20%, 30%, 40%, 50%,
60%, 70%, 80% or 90% the total surface area of the package. Preferably, the end holes
280 have a combined area of greater than about 50% the total surface area of the package.
It is a requirement of the present invention that the area of the first film region is less than
that of the second film region. In some embodiments, the first film region has an area of less
than about 90%, 80%, 70%, 60%, 50%, 40%, 30%, 20% or 10% the area of the second film
285 region.
In one exemplary embodiment, the second film region is a film of dimension 500 mm x 500
mm. The first film region is a film of dimension of 500 mm x 250 mm, and is overlaid on the
second film region. Thus the first and second regions may be considered to have the same
290 length, but different width. The first and second regions are welded together along two
edges to form a sleeve. This embodiment is illustrated in Fig. 1C. Based on the
aforementioned dimensions, it will be apparent that a 25% saving of film use is provided, as
compared to a prior art sleeve where the first and second film regions are both 500 mm x
500 mm. Based on the amounts of shrink wrap film used by large scale beverage producers
295 for packaging, the monetary savings provided by the present invention are substantial.
Moreover, environmental advantages are provided by the use of 25% less film. While many
types of shrink wrapping film a recyclable, much is never recycled. In any event, the
recycling process itself utilizes energy and resources and is therefore preferably avoided
300 where at all possible.
Upon a consideration of width, the first film region may have a width of less than about 100%
90%, 80%, 70%, 60%, 50%, 40%, 30%, 20% or 10% of the width of the second film region.
Preferably, the first film region has a width of less than about 50%, of the width of the second
305 film region.
Upon a consideration of length, the first film region may have a length which is greater than
that of the second film region such that when the sleeve is laid flat, the first film region does
not lay flush against the first film region. Exemplary embodiments are shown in Figs. 6 and
310 7. By lengthening the first film region, a taller handle-like arrangement is formed, and a
more shallow bowl-like arrangement is formed.
Embodiments where, the first film region has a length which is greater than that of the
second film region provide additional savings in shrink film usage (i.e. additional to the
315 savings provided by reducing the width of the first film region). Such savings therefore
providing even further advantage over the prior art where the first and second film regions
are of equal width and length.
With reference to the terms “width” and “length”, it will be understood these terms apply to an
320 elongate film region. Square film regions are contemplated to be useful, and where a film
region is square, it will be understood that the terms “width” and “length” are
interchangeable.
In some embodiments, the first film region has a length of greater than about 100%, 110%,
325 120%, 130%, 140%, 150%, 160%, 170%, 180%, 190% or 200% the length of the second
film region. Preferably, the first film region has a length of greater than about 10%, of the
width of the second film region.
It will be understood that in embodiments where the second film region is longer than the
330 first film region, some adjustment may be made to the second film region to improve strength
of the bowl-like arrangement formed. At for some product types, a more shallow bowl-like
region may require some fortification to prevent the loss of product from the unitized
package during transport or handling. Thus, in some embodiments, the second film region is
comprised of a film which is more resistant to mechanical deformation than the first film
335 region. For example, the second film region may be comprised of a thicker film, or a film
fabricated from an inherently stronger material.
In any event, the skilled person has detailed knowledge of shrink wrap films and testing
procedures allowing for the routine selection of a material suitable for the second film region
340 in circumstances where the first film region is longer than the second film region.
The ability to easily release products unitized by shrink wrapping allows to efficiency
increases in handling goods in a supply chain. In particular, a significant amount of time is
wasted in stocking supermarket shelves with products received in shrink wrap.
There is also time wasted by the consumer dealing with shrink wrapped items. For example,
children’s single serve milk drinks (typically of volume 200 ml) are often sold in shrink
wrapped packages of 6 rectangular boxes. The unitized package may have a small end
hole (or in some cases no end hole), forcing the consumer to resort to the use of scissors or
350 a kitchen knife to release individual containers. The use of sleeves of the present invention
will be of advantage in these situations as well allowing consumers to more easily release
individual drink boxes. This advantage is amplified in embodiments where the second film
region is longer than the first film region, given that the larger end hole facilitates removal of
product from the unitized package.
An economic advantage is gained for the packager, given that significantly less shrink wrap
film is used to achieve the same end. Applicant has found that individual products can be
maintained as a unitized package without the need to virtually encase the products in shrink
wrap film. It is only necessary to bind a portion of the products, such as the lower half, third,
360 quarter, eighth or sixteenth the total height of the products.
The provision of relatively large end holes provides for easier handling of the unitized
package. In particular, a larger end hole allows for the insertion of a carry handle which may
extend from a first end hole to a second end hole (typically opposite each other) such that
365 the load of the package is assumed mainly by the first film region.
Thus, a package handler simply inserts the rigid carry handle underneath the first film region.
The handler positions himself lateral to the package, bends his knees to lower the hands to a
point whereby the handle may be gripped and then extends his knees to lift the package.
370 Ergonomically, this approach to lifting is superior to lifting prior art shrink wrapped packages
which require the handler to bend forward at the waist (because the package is to his front),
insert the fingers between the base of the package and the ground, and then straighten the
waist. It is impossible for the handler to keep the back completely straight when lifting prior
art packages. By contrast, lifting packages of the present invention using a handle as
375 described herein allows the handler to maintain his back completely straight and lift from the
knees only because of the ability to grip the handle.
Reference is made to Fig. 2 showing the use of rigid carry handles for carrying large
beverage containers unitized with a shrink wrap sleeve of the present invention. It will be
380 appreciated that packages weighing more than 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17,
18, 19 or 20 kg may be safely lifted with each hand.
The use of handles further provides for significantly less strain on the body when moving
heavy packages by hand. It will be appreciated from Fig. 2 that the ability to carry packages
385 at the side of the handler allows for the packages to comfortably remain in that position for
some time with little strain on the back. Thus, a package can be carried a considerable
difference before fatigue sets in.
Further disclosure relating to preferred embodiments that particularly facilitate the use of
390 carry handles are provided herein infra.
It will be understood that the absolute or proportional difference in surface area of the first
region compared with the second region may change according to the size, shape, weight,
or number of the products being packaged. For example, where the products are shaped to
395 facilitate close packing (such as rectangular juice cartons) the first region may need to only
extend downwardly along the side face of the cartons for a small distance (for example 1, 2
or several centimetres).
However products which are less regularly shaped may not be capable of close packing, and
400 empty space remains between the products (at least at some levels). In those
circumstances, the products have greater scope to move relative to each other, and possibly
leading to inadvertent release from the package. It will be appreciated that irregularly
shaped products may need to be in contact with a greater area of film to prevent accidental
dislodgement. An example is found in soft drink bottles that have a broad base with a more
405 slender neck region.
Typically the sleeve is shaped and/or dimensioned to form a basket-like arrangement when
shrunk about multiple products. For example, the first film region forms a handle-like
arrangement which extends over an upper region of the packaged products, while the
410 second film region forms a bowl-like arrangement which cradles the lower region of the
packaged products. Thus, the first film region in these embodiments is more narrow than
the second film region, and the first film region is disposed centrally with respect to the
second film region.
415 In addition to the first film region being more narrow, the first film region may be longer that
the first film region. In this embodiment, a taller handle-like arrangement is formed.
Optionally, a more shallow basket-like arrangement may also be formed.
Irrespective of the relative dimensions of the first and second film regions, the bowl-like
420 arrangement has the advantage of catching and retaining any spillage of liquid which
inadvertently leaks from any packaged container.
During heating to shrink the film, the film of the second region (which typically underlies the
products to be unitized) contracts upwardly and around the lower regions of the products.
425 This upward movement is assisted in some embodiments where the heat is provided by
heated air blown from underneath the second film region.
The first and/or second film regions may be fabricated from any material known to be useful
for the purpose of shrink wrapping multiple products to provide unitization. Known shrink
430 wrap films are synthetic polymers, with polyvinyl chloride (PVC) being commonly used. This
type of film is commonly used in packaging boxes, CD and DVD packaging, software, small
canisters, and other non-edible items. PVC film also works very well with automated
machines. The skilled person is familiar with some drawbacks of PVC shrink wrapping
including insufficient strength for some applications. Moreover, the plasticizer in PVC films
435 hardens in cold conditions and softens under warmer conditions, therefore compromising the
strength of the seal and the plastic.
Polyolefin films are more typically, having become the preferred choice for packaging
products both edible and non-edible products. Polyolefin film is preferred for a variety of
440 reasons including: fewer odours when sealed, stronger seal, and more flexible storage.
Polyolefin shrink films do not have any chlorine; therefore they do not produce hydrogen
chloride gas. Polyolefin film does not include any plasticizer, so temperature is not an issue.
Polyolefin can be stored in a wide range of temperatures and does not harden and soften in
different environments like PVC shrink film. Polyolefin films are commonly used for almost
445 every kind of application including: toys, sporting goods, printed wrap, foods. Drawbacks of
polyolefin film includes machine compatibility are the two major drawbacks of polyolefin
shrink film. Polyolefin is also commonly more expensive than PVC shrink wrap.
In some embodiments, the first and/or second film region comprises or consists of a
450 polyethylene (particularly low density, linear low density, or high density) or a polypropylene.
The first and second film regions may be composed of identical film types, or may be
composed of different film types. Moreover, different film thickness may be used. In
particular, the film thickness in the first film region may be thicker than that of the second film
455 region. This embodiment may assist in providing advantage described supra with regard to
the insertion of a carry handle under the first film region.
Having the benefit of the present specification the skilled person is capable of selecting a
film type for the first and second film regions having regard to a number of factors including
460 strength, temperature issues, product size, product weight, product shape, etc.
For example, where it is desired to unitize a number of products having a combined weight
of up to about 8 kg the second film region may comprise film of thickness between about 40
µm to about 60 µm, and a first film region of between about 60 µm to about 80 µm. In those
465 embodiments, the ratio of first to second film thickness ranges from 1:1 to 2:1.
For example, where it is desired to unitize a number of products having a combined weight
of greater than about 8 kg the second film region may comprise film of thickness between
about 60 µm to about 80 µm, and a first film region of between about 80 µm to about 100
470 µm. In those embodiments, the ratio of first to second film thickness ranges from 1:1 to 10:6.
It is contemplated that other embodiments may have a ratio of first film thickness to second
film thickness of at least about 1.1:1, 1.2:1, 1.3:1, 1.4:1, 1.5:1, 1.6:1, 1.7:1, 1.8:1, 1.9:1, 2:1,
2.1:1, 2.2:1, 2.3:1, 2.4:1, 2.5:1, 2.6:1, 2.7:`, 2.8:1, 2.9:1, or 3:1.
It will be appreciated that shrink wrapping is often performed with the assistance of
dedicated machines. Typically, the machine holds two rolls of shrink wrap film. The products
to be shrink wrapped are disposed between the films of the first and second rolls, with two
edges of the films being welded (or bonded in some other way) to form a sleeve surrounding
480 the products. The films are then cut to release the sleeve (with enclosed products), before
being exposed to heat to shrink the films. The heat may be applied by passing the products
through a shrink tunnel, or by simply directing a heat gun about the products.
For high throughput applications, the process may be automated (or at least partially
485 automated) with conveyors used to position the products to be wrapped between the two
films, the films cut, and the products passed through a shrink tunnel by way of conveyor.
Accordingly, it will be apparent that the present invention may be incorporated into the
aforementioned methods by providing a first film roll and a second film roll, the first film roll
490 having a width less than the second film roll. Thus, when film from the first and second rolls
are disposed about products, and the cut ends of the films are joined, an arrangement such
as that shown in Fig. 1C results. That arrangement is then conveyed into a shrink tunnel
where heat is applied, leading to the unitized package shown in Fig 1D.
495 In light of the above it will be appreciated that in a further aspect the present invention
provides a method for unitizing two or more products, the method comprising the steps of:
providing two or more products;
providing a first length of film;
500 providing a second length of film, the second length of film being wider than the first
length of film;
disposing the two or more products between the first and second lengths of film;
bonding the edges of the first and second lengths of film to form a sleeve; and
heating the first and second lengths of film such that the lengths of film contract
505 about the two or more products.
It is contemplated that the present methods may be executed on existing shrink wrapping
machines by simply altering the widths of the film rolls to provide the required differences in
area or width of the first and second films. Where required, rolls having film of differential
510 thicknesses may be used in the machine.
Where the first film region is longer than the second film region (such as shown in Figs. 6
and 7) a differential feeding method may be applied to the two films. For example, the
515 longer first film may be fed at a higher rate than the shorter second film region. This may be
accomplished by a braking method (such as a pressure pad) being applied to the second
film region so as to retard feeding of the second film region compared with the first.
The film used in the methods of the present invention may have any characteristic, any
520 combination of characteristics, or all characteristics described as useful in the sleeves of the
present invention, including any composition, shape, width, or thickness as recited herein.
In another aspect, the present invention provides a shrink wrapped product produced by a
method described herein.
It will be appreciated that the present invention is disclosed mainly by reference to the
unitization of products such as beverages which are typically provided in the form of tetra
pak cartons and polyethylene vessels. It will appreciated that the invention is applicable to
other products such as dry foods (such as flour and rice, which may be provided in the form
530 of cardboard cartons, sealed plastic bags, or paper wraps), and hardware (such as light
globes and toys, which may be provided in the form of cardboard boxes, or rigid plastic shell
packaging). However, usage in beverages is particularly advantageous because of the large
amounts of films used in that industry, and also because the significant weights of larger
beverage containers.
It should be appreciated that in the above description of exemplary embodiments of the
invention, various features of the invention are sometimes grouped together in a single
embodiment, figure, or description thereof, for the purpose of streamlining the disclosure and
aiding in the understanding of one or more of the various inventive aspects. This method of
540 disclosure, however, is not to be interpreted as reflecting an intention that the claimed
invention requires more features than are expressly recited in each claim. Rather, as the
following claims reflect, inventive aspects lie in less than all features of a single foregoing
disclosed embodiment. Thus, the claims following the Detailed Description are hereby
expressly incorporated into this Detailed Description, with each claim standing on its own as
545 a separate embodiment of this invention.
Furthermore, while some embodiments described herein include some but not other features
included in other embodiments, combinations of features of different embodiments are
meant to be within the scope of the invention, and form different embodiments, as would be
550 understood by those skilled in the art. For example, in the following claims, any of the
claimed embodiments can be used in any combination.
In the description provided herein, numerous specific details are set forth. However, it is
understood that embodiments of the invention may be practiced without these specific
555 details. In other instances, well-known methods, structures and techniques have not been
shown in detail in order not to obscure an understanding of this description.
Thus, while there has been described what are believed to be the preferred embodiments of
the invention, those skilled in the art will recognize that other and further modifications may
560 be made thereto without departing from the spirit of the invention, and it is intended to claim
all such changes and modifications as falling within the scope of the invention.
The present invention will now be more fully described by reference to the following non-
limiting preferred embodiments.
DETAILED DESCRIPTION OF PREFFERED EMBODIMENTS
Turning firstly to Fig. 1, a comparison between prior art (Panels A and B) and the shrink
570 wrap sleeves of the present invention (Panels C and D) is shown. The prior art sleeve
(shown generally as 10) has a first film region 12, and a second film region 14; each region
formed from separate sheets of shrink wrap film of identical size, thickness and composition.
The regions 12 and 14 are welded together along the edges 16 and 18 to form an opening
toward the front 20, and an opening at the rear (not shown). Disposed within the sleeve are
575 a number of milk containers (two of which are shown as 22 and 24).
Reference is made to Fig. 1B which shows the sleeve 10 and containers 22 and 24 after
application of heat. The films (12 and 14, now shown as shaded) contract about the
containers 22 and 24 to form an end hole 26.
Reference is made to Fig. 1C showing a preferred sleeve of the present invention (shown
generally as 40) has a first film region 42, and a second film region 44; the first film region 42
formed from a sheet of shrink wrap film which is of narrower dimension than that of the
second film region 44. The regions 42 and 44 are welded together along the edges 46 and
585 48 to form the precursor of a basket-like arrangement. The basket-like arrangement is
formed by (i) the handle-like arrangement formed by the first film region 42 and (ii) the bowl-
like arrangement formed by the second film region 44. Disposed within the sleeve are a
number of milk containers (two of which are shown as 50 and 52).
590 Reference is made to Fig. 1D which shows the sleeve 40 and containers 50 and 52 after
application of heat. The films (22 and 44, now shown as shaded) contract about the
containers 42 and 44 to form an end hole, the edge of which is indicated at 54.
It will be noted that the end hole of the prior art 26 is significantly smaller than that of the
595 present invention 54. It will be further noted that the sleeve of the present invention (when
shrunk) is capable or retaining the containers 50 and 52, however to remove a container
only the film about the upper region of the end hole 54 need be stretched a small amount to
allow a container to be pulled outward (i.e. out of the page as drawn).
The space 56 allows for the insertion of a carry handle (not shown). The use of the carry
600 handle is shown in Fig. 2.
Fig. 3 shows a sleeve of the present invention when laid flat and devoid of product. The
lower region (second region) 100 is a film sheet having a first edge dimension 102 and a
second edge dimension 104. The upper region (first region) 106 is a film sheet disposed
over the lower region 100. The upper region 106 has a first edge dimension 108 and a
605 second edge dimension 110. The upper region 106 and lower region 100 are welded
together along the edges 112 and 114. It will be noted that the upper region 106 is disposed
centrally over the lower region 100.
Figs. 4 to 7 relate to preferred embodiments providing for the use of lower amounts of film
sheet as compared with the embodiments of Fig. 1 to 3.
610 It will be noted from Figs. 4C and 4D (which are directly comparable with Figs 1C and 1D)
that a basket-like arrangement is provided. However the handle-like arrangement (formed
by the first film region 42 and 44) in the embodiment of Figs 4C and 4D is longer than that of
the embodiment of Figs 1C and 1D. By this, a taller handle-like arrangement of the basket is
provided, with the bowl-like arrangement of the basket (being formed from the second film
615 region 44) being more shallow as compared with the embodiment of Figs. 1C and 1D.
It will be further noted that heat shrinking the film shown in Fig. 4C about the containers 50
and 52 forms a larger end hole 54 (as shown in Fig. 4D) as compared with the end hole of
Fig. 1D.
The formation of a larger end hole 54 is the direct result of the utilization of an overall lower
620 area of shrink film in the embodiment of Figs. 1 to 3 as compared with the embodiment of
Figs. 4 to 7.
It has been found that embodiments having a first film region that is longer than the second
film region (and therefore having a taller handle-like arrangement and more shallow bowl-like
arrangement) are nonetheless capable of securely unitizing containers. Furthermore, the
625 containers may be carried, as shown in Fig. 5.
The sleeve shown in Fig 4C (but devoid of containers) is shown in Fig. 6. In particular, it will
be noted that the first film region 106 is longer than the second film region 100 (i.e.
dimension 110 is longer than dimension 104) such that when the sleeve is laid flat (as shown
in Fig. 6) the first film region 106 is unable to lay flush with the second film region 100.
630 Fig. 7 shows yet a further embodiment of the sleeve with the first film region 106 being even
longer than that of the first film region of Fig. 6. In this embodiment, a larger end hole would
formed upon shrink wrapping the sleeve about containers than for the embodiment shown in
Fig. 6. Accordingly, the embodiment of Fig. 7 uses even less shrink film that the
embodiment of Fig. 6.
Claims (30)
1. A shrink wrap sleeve for unitizing two or more items, the sleeve comprising a first film region and a second film region, the first film region having an area less than that of the second film region. 645
2. The shrink wrap sleeve of claim 1 wherein the area of the first film region is less than about 90%, 80%, 70%, 60%, 50%, 40%, 30%, 20% or 10% of that of the second film region.
3. The shrink wrap sleeve of claim 1 wherein the area is of the first film region is less than about 60% of that of the second film region.
4. The shrink wrap sleeve of claim 1 wherein the area is of the first film region is about 50% of that of the second film region.
5. The shrink wrap sleeve of any one of claims 1 to 4 wherein the first and second film 655 regions are discrete films bonded along at least one edge.
6. The shrink wrap sleeve of any one of claims 1 to 4 wherein the first and second film regions are discrete films bonded along two edges. 660
7. The shrink wrap sleeve of claim 6 wherein the two edges are opposite each other and/or substantially parallel to each other.
8. The shrink wrap sleeve of any one of claims 1 to 7 wherein the length of the first film region substantially identical to that of the second film region 665 .
9. The shrink wrap sleeve of any one of claims 1 to 8 wherein a dimension of the first film region is less than that of the second film region.
10 . The shrink wrap sleeve of any one of claims 1 to 9 wherein the width of the 670 first film region is less than about 90%, 80%, 70%, 60%, 50%, 40%, 30%, 20% or 10% of that of the second film region.
11. The shrink wrap sleeve of any one of claims 1 to 9 wherein the width of the first film region is less than about 60% of that of the second film region.
12. The shrink wrap sleeve of any one of claims 1 to 9 wherein the width of the first film region is about 50% of that of the second film region.
13. The shrink wrap sleeve of any one of claims 1 to 12 wherein the first film region is 680 longer than the second film region such that when the sleeve is laid flat, the first film region does not lay flush against the first film region.
14. The shrink wrap sleeve of claim 5 wherein the first film region is at least about 110% the length of the second film region.
15. The shrink wrap sleeve of claim of any one of claims 1 to 14, wherein when superimposed, the first film region is substantially central with respect to the second film region.
16. The shrink wrap sleeve of any one of claims 1 to 15 wherein the first film region (when shrunk) has a greater resistance to mechanical deformation than the second film region (when shrunk). 695
17. The shrink wrap sleeve of any one of claims 1 to 16 wherein the first film region has a thickness greater than that of the second film region.
18. The shrink wrap sleeve of any one of claims 1 to 17 wherein the first film region has a thickness at least about 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, or 50% greater than 700 the second film region.
19. The shrink wrap sleeve of any one of claims 1 to 18 wherein the first film region has a thickness of greater than about 60 µm and/or the second film region has a thickness of less than about 60 µm.
20. The shrink wrap sleeve of claim 18 wherein the first film region has a thickness of between about 60 µm to 80 µm, and the second film region has a thickness of between about 40 µm to 60 µm. 710
21. The shrink wrap sleeve of any one of claims 1 to 17 wherein the first film region has a thickness of greater than about 80 µm and/or the second film region has a thickness of less than about 80 µm.
22. The shrink wrap sleeve of claim 18 wherein the first film region has a thickness of 715 between about 80 µm to 100 µm, and the second film region has a thickness of between about 60 µm to 80 µm.
23. The shrink wrap sleeve of any one of claims 1 to 22 wherein the first and second film regions are shaped, dimensioned or otherwise configured so as to form a basket-like 720 arrangement upon shrinking around two or more products.
24. A method for unitizing two or more products, the method comprising the steps of: providing two or more products; 725 providing a first length of film; providing a second length of film, the second length of film being wider than the first length of film; disposing the two or more products between the first and second lengths of film; bonding the edges of the first and second lengths of film to form a sleeve; and 730 heating the first and second lengths of film such that the lengths of film contract about the two or more products.
25. The method of claim 24 wherein the two or more products are disposed between the first and second lengths of film before the step of bonding.
26. The method of claim 24 or claim 25 wherein the two or more products are beverage containers.
27. The method of any one of claims 24 to 26 wherein each of the beverage containers is 740 capable of containing at least about 1 litre, or at least about 2 litres.
28. The method of any one of claims 24 to 27 comprising the step of cutting the first and second lengths of film to form an isolated sleeve, the cutting step being performed before, or contemporaneously with, the heating step.
29. The method of any one of claims 24 to 28 wherein the first length of film and/or second length of film has a characteristic as described in any one of claims 1 to 19.
30. A shrink wrapped product produced the method of any one of claims 24 to 29. DATED: 18 November 2014 By: CHURCHILL ATTORNEYS Patent Attorneys for: 755 LACTOTE PTY LTD Unit 201, 55 Cumberland Drive MARIBYRNONG, Victoria 3032 Australia 104 112 FIG. 3
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2014904620 | 2014-11-18 |
Publications (1)
Publication Number | Publication Date |
---|---|
NZ714305A true NZ714305A (en) |
Family
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