Note: Descriptions are shown in the official language in which they were submitted.
CA 02270358 2006-06-14
ENTITLED: METHOD FOR MAKING TAMPER-EVIDENT
CONTAINER WITH RECLOSABLE FASTENER
BACKGROUND OF THE INVENTION
s Field of the Invention.
The present invention relates to an improved reclosable, tamper-evident
container formed, at least in part, from a flexible material. Access to the
interior
of such a container is provided by a security seal formed through the flexible
material, and the reclosable fastener of this invention is attached to the
container
io in sealing relation to that seal. The improved fastener of this invention
is
particularly characterized by its structure comprising a pair of mating,
reclosable
sealing strips, both of which are attached to a common surface of the
container's
flexible material. Preferably, the reclosable fastener of this invention is
disposed
on the inside surface of the container.
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Description of the Prior Art.
Reclosable containers utilizing zipper-type fasteners are well known in the
packaging industry and are used for holding, displaying and dispensing a wide
variety of products ranging from hardware items to food products intended for
human consumption. The construction of virtually all such prior art fasteners
s comprises one or more female parts which releasably receive one or more
corresponding male parts. In order to provide access to the interior of the
container, those portions of the fastener bearing the respective female and
male
parts must typically be attached to opposing sides of the container such that
the
female and male parts will be in registry with each other. A typical such
~o construction is disclosed in U. S. Patent No. 4,909,017 to McMahon and
Spanier.
Obviously, then, according to the present state of the packaging arts, great
care and precision are required in the placement and attachment of reclosable
fasteners to their related containers. Notwithstanding the existence of a
great
is variety of such fasteners and reclosable containers utilizing such
fasteners, it is
clear that there remains a great need in the packaging arts for a reclosable,
zipper-type fastener, both parts of which can be attached to a single common
surface of the material forming a wall of the container before the container
is
even partially formed. Such a fastener would significantly simplify the
Zo manufacturing process for reclosable containers by not interfering with the
operation of standard forming and filling machines.
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SUMMARY OF THE INVENTION
The present invention relates to an improved tamper-evident container
formed from a flexible material and having a reclosable fastener. In a
preferred
embodiment, the fastener of this invention comprises a pair of mating,
reclosable
sealing strips, each comprising a strip base segment which is attachable to a
s common surface of the material forming a wall of a reclosable container.
Each
of the sealing strips further comprise a second segment integral with its
corresponding base segment and free from the container wall surface. One of
the
strips comprises a male fastener part, and the other of the strips comprises a
female fastener part in receiving relation to the male part. Tamper-evident
to access to the interior of the container is provided by a removable portion
of the
flexible material to form an aperture for access to the reclosable fastener.
According to a first embodiment of the reclosable fastener, the male
fastener part is at the juncture of one of the base segments and its
corresponding
second segment, and the female fastener part is formed on the second segment
is of the other sealing strip. Both base segments are attached to a common
interior
surface of the flexible material, and both second segments are free from the
common surface.
According to a second embodiment, the female fastener part is formed on
one of the sealing strip second segments, and that second segment is attached
to
Zo a second surface of the flexible material opposite the common surface.
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Also disclosed and claimed hereinafter is a method for attaching the
reclosable zipper-type fastener to the flexible material from which the
container
is made so as to provide a tamper-evident reclosable seal.
The invention accordingly comprises the features of construction,
combination of elements, and arrangement of parts which will be exemplified in
s the constructions hereinafter set forth, and the scope of the invention will
be
indicated in the claims.
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BRIEF DESCRIPTION OF THE DRAWINGS
For a fuller understanding of the nature and objects of the invention,
reference should be had to the following detailed description taken in
connection
with the accompanying drawings, in which:
FIGURE 1 is a side elevation showing a segment of a first embodiment
s of the container of this invention with the fastener attached to the inside
of a
segment of the flexible material at least partially forming a reclosable
container.
FIGURE 2 is a side elevation similar to that of Fig. 1 showing the
segment of the reclosable container with the tamper-evident portion removed
and
the fastener opened.
to FIGURE 3 is a view similar to that of Fig. 1 showing a second
embodiment of the container.
FIGURE 4 is a side elevation similar to that of Fig. 3 showing the
segment of the reclosable container with the tamper-evident portion removed
and
the fastener opened.
is FIGURE 5 is a sectional view taken along line 5-5 of Fig. 6 showing
attachment of the reclosable fastener to a common interior surface of a
reclosable
container.
FIGURE 6 is a plan view of the reclosable container shown in Fig. 5.
Similar reference characters refer to similar parts throughout the several
Zo views of the drawings.
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DETAILED DESCRIPTION
A first embodiment of the improved tamper-evident container formed
from a flexible material and having a reclosable fastener is generally
indicated
as 10 in the views of Figs. 1, 2, 5 and 6. The reclosable fastener is
generally
indicated as 12.
s Referring to the view of Fig. 1, it can be seen that fastener 12 comprises
a pair of mating, reclosable sealing strips, generally indicated as 14 and 16,
respectively. Each of the sealing strips 14 and 16 comprise a base segment i8
and 20, respectively. Base segment 18 is attached to interior surface 22 of
flexible material 24, and base segment 20 is similarly attached to the common
to interior surface 22. As shown in Fig. 1, attachment of the fastener 12 to
common interior surface 22 is indicated by perimeter seal 26.
Also shown in the view of Fig. 1 is a removable portion 28 of flexible
material 24 by which access to the interior of container 10 may be obtained
once
portion 28 is removed to form an aperture providing access to strips 14 and 16
is whereby they may be separated from each other. This is clearly illustrated
in the
"opened" view of Fig. 2. Referring to the view of Fig. 6, it can be seen that
removable portion 28 is defined by a plurality of cuts formed through flexible
material 24. In the preferred embodiment, these cuts comprise a plurality of
perforations 30 and at least one slit 32, though a pair of opposed slits 32
are
zo illustrated in the view of Fig. 6. Slit 32 provides a free segment of
flexible
material 24 whereby portion 28 may be removed to provide access to fastener
12.
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The perforations 30 are preferably formed within the area defined by line A-A,
and the slit, or slits, 32 are preferably formed within the area between
arrows B.
Returning to the view of Fig. 1, sealing strip 14 further comprises a
second segment 34 integrally formed therewith, but not attached to common
interior surface 22. Sealing strip 16 also comprises a second segment 36
integral
with its base segment 20, but not attached to common interior surface 22. A
female fastener part 38 is formed on second segment 34, and a corresponding
male fastener part 40 is formed on sealing strip 16 at the juncture of base
segment 2(? with second segment 36.
As further shown in the view of Fig. 1, container 10 further includes
to another segment of flexible material 24' forming another wall thereof, and
a
seam 42 is provided by the joining of flexible material 24 to a corresponding
segment of flexible material 24' . Referring to the views of Figs. 5 and 6, a
similar seam 42' is formed at the bottom of container 10.
Referring to the view of Fig. 6, and remembering that a principal end use
~s for the container 10 is to hold food products intended for human
consumption,
the formation of an hermetic seal is a particular advantage of this invention.
As
shown in Fig. 6, the perimeter seal 26 extends around the perimeter of
fastener
12. However, a broadened segment 44 can be seen at each end of perimeter seal
26. Broadened segment 44 is frequently referred to in the packaging industry
as
2o a "splotch" seal. Such a splotch seal involves the application of heat and
pressure to the distal ends of sealing strips 14 and I6 so as to form a
flattened,
broadened segment 44. Then, when the fastener 12 is attached to common
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interior surface 22 of flexible material 24 by the perimeter seal 26, an
hermetic
seal is formed in completely surrounding relation to the removable portion 28.
Referring now to the views of Figs. 3 and 4, a second embodiment of the
tamper-evident container is generally indicated as 10'. Inasmuch as the
structural
elements of container 10' are essentially identical to those of first
embodiment
s 10> identical reference numerals have been used for their identification. As
clearly shown in the views of Figs. 3 and 4, second embodiment 10' further
comprises a tack seal 46 to bond second segment 34 to inside surface 48 of
flexible material 24' forming the opposite side of container 10' . Such a
construction virtually eliminates any probability of material contained within
to container 10' becoming wedged or caught in the gap otherwise present
between
second segment 34 and flexible material 24' .
From the above description of the structure of first and second
embodiments of the container 10 and 10', respectively, attention is now
invited
to the following description of the method for attaching fastener 12 to a
flexible
is material 24 for providing a tamper-evident reclosable opening therethrough.
First> a segment of flexible material 24 is selected for forming a container
10.
A plurality of cuts comprising perforations 30 and at least one slit 32 are
made
to define a removable portion 28. Next, a reclosable zipper-type fastener 12
is
selected and cut to a predetermined length sufficient to overlie the removable
Zo portion 28. Opposed distal ends of fastener 12 are then "splotched" and the
splotched length of fastener is disposed in adjacent, overlying relation to
removable portion 28. The perimeter seal 26 is formed by the application of
pressure and heat. If desired, tack seal 46 would be made in a subsequent
step.
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From that point on, the container would be formed and filled using standard
form
and fill apparatus and methods. No further manipulation of fastener 12 and its
related removable portion 28 is required.
It will thus be seen that the objects set forth above, among those made
apparent from the preceding description, are efficiently attained, and, since
s certain changes may be made in the above construction without departing from
the scope of the invention, it is intended that all matter contained in the
above
description or shown in the accompanying drawings shall be interpreted as
illustrative and not in a limiting sense.
It is also to be understood that the following claims are intended to cover
to all of the generic and specific features of the invention herein described,
and all
statements of the scope of the invention which, as a matter of language, might
be said to fall therebetween.
Now that the invention has been described,
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