[0001] The present invention relates to a method of forming a handle on a wrapped package,
and to a package so formed.
[0002] One way of wrapping a package in a plastics film is by shrink-wrapping. The package
is loosely wrapped in a loose sleeve or bag of thin film of plastics material, which
material is then heated. The heating causes the plastics material to shrink around
the package so that the package is tightly encased in the film.
[0003] Another way of wrapping a package is by stretch-wrapping. Here a plastics film is
wrapped tightly around the package so that again the result is a tightly encased package.
[0004] It is well known to provide a shrink or stretch- wrapped package with a handle by
first wrapping the package in plastics film and then attaching the handle to the package.
The usual way of doing this uses an adhesive tape handle which is simply stuck to
the wrapping film. Examples of this are shown in e.g. US-A-4078659, US-A-4294058,
US-A-4296861, and
US-A-4422281. It is, however, desirable for the handle to be attached simultaneously
with the wrapping of the package, so that both could be done in a single manufacturing
operation.
[0005] It is known from UK-A-1382842 to attach a handle to a package by simultaneously wrapping
a package in a first plastics film and positioning a second film so that it partially
underlies and partially overlies the second plastics film, at the top of the article
to be wrapped. The two plastics films are sealed together, and the first film is shrunk
around the article. The second film has different characteristics, and so does not
conform to the shape of the article in the same way as the first film. As a result
it forms a handle.
[0006] However, the attachment of the handle only to the film covering the top of the package
gives insufficient strength for all but the lightest of objects. To carry heavier
objects, such as filled bottles, more bonding strength is needed. In the arrangements
in which the handle is secured to the package after wrapping, this simply means that
the length of the part of the handle stuck to the wrapping must be increased. This
is not possible, however, with the construction of UK-A-1382842 because of the way
the handle film is folded into the other film.
[0007] It has been found that if the handle is attached at or near the bottom of the package,
sufficient strength may be achieved by the "tack" of the plastic films as they contact
each other along the sides of the article. The present invention therefore proposes
a method in which the wrapping is formed, with the handle secured at or near the bottom
of the article, then conformed to the shape of the article.
[0008] If conformation of the wrapping is by shrink-wrapping, the material to form the handle
may have a lower shrink capability and/or be of thicker gauge than the material to
form the wrapping, so that it shrinks less than the wrapping material. If the conformation
is by stretch-wrapping, the material to form the handle may have a lower tension than
the wrapping material. The other properties of the material to form the handle could
then be the same as the wrapping material, unless different properties were needed
for suitable handle strength.
[0009] The material to form the handle is preferably a narrow web of suitable plastics material
which is sealed to a wrapping film by e.g. heat sealing, and it is desirable that
this heat sealing of the handle is carried out in the same operation as the heat sealing
of the wrapping film around the package.
[0010] An embodiment of the present invention will now be described, by way of example,
with reference to the accompanying drawings, in which:
Fig. 1 shows a method of shrink-wrapping a package according to a first embodiment
of the present invention; and
Fig. 2 shows a package wrapped by the method of Fig. 1.
[0011] Referring first to Fig. 1, a first wrapping web 1 extends underneath a package 2
to be wrapped. The package 2 may be a single item or a collation of items. At one
side of the package 2, the first web 1 is heat sealed at seal 3 to a second web 4,
and also to a third web 5, the second and third webs extending over the top of the
package. The first and second webs 1, 4 will form a sleeve of thin film plastics material
around the package 2, whilst the third web 5 will form the handle. The first web 1
originates in a lower web drum 6, and passes through a lower web drive 7, past a roller
8 and over the top of a lower seal jaw 9. The second web 4 originates in an upper
web drum 10 and passes through upper drive means 11, past a roller 12 and under an
upper seal jaw 13. The third web 5, which would normally be narrower than the other
two webs, originates in a handle web drum 14 and passes through the upper drive means
11, past the roller 12 and under the upper seal jaw 13. The distance between the second
and third webs along their runs from the upper drive means 11 to the heat seal 3 is
exaggerated for the sake of clarity.
[0012] From the position shown in Fig. 1, the upper seal jaw 13 is lowered to the position
shown by dotted lines, at which position the three webs 1, 4, 5 are pressed together.
Heat is applied between the upper and lower seal jaws 13 and 9 respectively to seal
the webs to each other, with the second and third webs 4, 5 passing around three sides
of the package 2.
[0013] The three webs are then cut at the seal thus formed so that part of the seal remains
with the webs around the package and part holds the ends of the webs together. The
package 2 is then removed e.g. via conveyor 15, and another package inserted from
the left in Fig. 1. The part of the seal formed in the previous operation which holds
the ends of the webs together then forms the seal 3 for the new package.
[0014] If the package is to be shrink-wrapped, all three webs 1, 4, 5 are then heated e.g.
by hot air blower 16, but the properties of the third web 5 are such that it shrinks
less than the other two webs 1, 4. This may be achieved by making the third web 5
of thicker gauge than the other two webs, or by using a plastics material with a lower
shrink capability. The result is shown in Fig. 2. The first and second webs 1 and
4 are wrapped tightly around the package 2 whilst the third web 5 extends loosely
over the top of the package 2 and thus forms a handle. The handle is secured to the
rest of the wrapping at the heat seal 3, and also at a heat seal 14 formed at the
closing of the seal jaws 9 and 13. In this way, attachment strength is given by the
"tack" of the second and third films 4, 5 where they are in contact.
[0015] In some cases the securing of the handle to the rest of the wrapping may be further
strengthened by providing a material on the second or third webs 4 and 5 which bonds
the webs together when the package is shrink-wrapped.
[0016] If the embodiment of Fig. 1 is to be used in stretch-wrapping, the first and second
webs 1 and 4 would be under tension and the third web 5 would be relatively loose.
In order to achieve this it would probably be necessary to provide a separate drive
means for the third web 5, rather than use the same drive means 11 as the second web.
[0017] The handle need not be attached to the bottom of the wrapped package. If both the
upper and lower seal jaws move, the sealing together of the three webs may be achieved
at an intermediate point along the side of the package 2. However, this should be
far enough from the top of the package 2 to ensure that attachment strength is given
by "tack" due to contact between the films.
[0018] The material used for the first and second webs 1 and 4 may be of any suitable shrink
or stretch-wrapping material. If the webs 1, 4, 5 are to be sealed together by heat
as described above, the third web should be compatible for heat sealing to the other
webs, and may in addition be coloured, printed, or embossed, to provide e.g. information
about the package. However, other sealing methods may be used, e.g. ultrasonic welding.
[0019] The above description has described the formation of a single handle on the package;
the present invention is not limited to this, and two or more handles may be provided
by the use of additional webs. It would also be possible to form the handle from a
rope of plastics material, rather than a web. The present invention is not limited
to shrink and stretch-wrapping methods, but may also be adapted to other wrapping
techniques, such as the use of "L" sealing machines. The important feature is that
the plastics material to form the handle should behave differently from the wrapping
material when the package is wrapped.
1. A method of wrapping an article (2) comprising the step of encasing the article
(2) in a covering (1, 4, 5) of plastics material having two parts (1, 4 and 5) of
different properties, and the step of acting on that covering (1, 4, 5) so that one
part (1, 4) conforms to the shape of the article (2) and the other part (5) conforms
differently to form a handle for the wrapping;
characterised in that:
during the step of encasing the article (2) the said other part (5) of the covering
forming the handle is secured to the said one part (1,4) at or adjacent the base of
the article (2) and extends around the sides and top of the article (2) such that,
after the step of acting on the covering, the said one part (5) contacts the said
other part (1, 4) along the sides of the article (2).
2. A method according to claim 1, wherein the covering (1, 4, 5) is shrunk to conform
to the article (2).
3. A method according to claim 2, wherein the said other part (5) of the covering
forming a handle has a lower shrink capability when heated than the said one part
(1, 4) of the covering.
4. A method according to claim 2 or claim 3, wherein the said other part (5) of the
covering forming the handle has a greater thickness than the said one part (1, 4)
of the covering.
5. A method according to claim 1, wherein the covering (1, 4, 5) is stretched to conform
to the article (2), and the said other part (5) forming the handle has a lower tension
than the said one part (1, 4).
6. A method according to any one of the preceding claims, wherein the said other part
(5) forming the handle is heat sealed to the said one part (1, 4).
7. An apparatus for wrapping an article (2), comprising:
three films (1, 4, 5) of plastics material, one of the films (5) having different
properties from the other two films (1, 4);
means (6, 7, 8, 10, 11, 12, 14) for guiding the films around an article (2) such that
the article (2) is encased in the said films (1, 4, 5) and the said one film (5) extends
around the sides and top of the article (2);
means (9, 13) for sealing the films (1, 4, 5) together at at least one point (3) at
or adjacent the base of the article (2); and
means for causing the films (1, 4, 5) to conform to the shape of the article (2),
such that the said one film (5) conforms differently from the other films (1, 4) and
thereby forms a handle for the article (2), the said one film (5) contacting at least
one of the other two films (1, 4) along the sides of the article.
8. An apparatus according to claim 7, wherein the means for causing the films (1,
4, 5) to conform to the shape of the article is heating means for causing the films
to shrink.
9. An apparatus according to claim 7 or claim 8, wherein the sealing means (9, 13)
is a pair of heatable jaws adapted to clamp the films (1, 4, 5) together between the
jaws and heat the films (1, 4, 5) so that they seal together.