Note : Les descriptions sont présentées dans la langue officielle dans laquelle elles ont été soumises.
~ 33
_ 1 _
This invention relates to packages or boxes
of the hinged lid type, especially packages or boxes
for cigarettes, and to blanks from which such packages
or boxes may be formed.
Hinged lid packages for cigarettes have
conventionally been manufactured from two cardboard
blanks. One blank forms the body and lid whlch are
joined by an integral hinge, and the other forms an
insert or inner frame which is glued to the inside of
the front and side walls of the body and projects above
these walls to provide a collar. The collar serves to
provide a seal between the lid and body when the pack-
age is closed, and to frictionally engage the inside of
the front wall of the lid to retain the package closed.
In packaging of cigarettes the manufacturer
obtains the first blank, which is relatively complex in
structure, from a first supplier, and cuts the second
blank, which is relatively simple in structure, himself.
The material for the second blank is obtained as a roll
from a second supplier, and is die cut to provide the
required insert blanks.
~Dr-~
This procedure has several disadvantages:
The cardboard of the second blank is different
from the cardboard of the first blank. This means that
a uniform appearance is not achieved and it is not
possible to have an identical colour match for the body
and lld on the one hand, and the collar on the other.
The use of a separate blank for the insert
also means that it is not possible to pre-print display
material or information on the collar that will agree in
appearance or complement display material or information
on the ~ody and lid.
The dies for cutting the second blank have a
limited life and must be replaced periodically.
Inevitably poor quality inserts are produced towards the
end of the die life, as well as inserts of such inferior
quality that they cannot be used.
The use of two blanXs results in the upper
edge of -the front wall of the body being a raw or
expose~ edge, which results in a less acceptable and
less marXetable product.
It should be recognized that an attractive,
even expensive, appearance is an important marketing
feature in the' sale of cigarettes, particularly in the
high priced market. Packets are produced in attractive
colours, sometimes with a gold, silver or platinum metallic
3 ~ 3~
sheen, with handsome crests and raised or embossed
lettering.
In order to satisfy the cigarette manu-
facturer the packet manufacturer is required to supply
blanks which will form a packet of a slim attractive
appearance. In particular the lid should close firmly
to provide a rectangular cuboid with smooth walls. In
other words the lid should fit snugly against the upper
edges of-the front and side walls of the body so that
there are no unsightly gaps and the front and side walls
of the closed packet appear to be continuous, with just
a line identifying the mating edges of the lid and body.
The importance of a smooth front wall formed
from the front wall of the lid and the front wall of the
body has become particularly important in Canada. When a
packet of cigarettes is assembled by the cigarette manu-
facturer, it is finally wrapped in a transparent plastic
foil and a tear strip is applied.
The tear strip is applied by the cigarette
manufactur~r around the packet so as to conceal the line
connection on the front wall between the lid and the
body. This location is selected since the appearance of
the packet is enhanced by concealing the line connection
on the front wall, and in addition this area of the
packet is free from display or information material, so
~ 3
that locating the tear strip in this area avoids
obscuring such material.
In the final operation an excise stamp is
applied to show that the required duty has been paid
to the Government.
In ~anada this excise-stamp forms part of the
tear strip. The tear strip material is provided as a
roll of a predetermined length to provide tear strips
for a predetermined number of packets; the excise
1~ tax having been paid in advance, having regard to the
length of the roll, by the cigarette manufacturer.
In order for a tear strip to be supplied from the
roll of tear strip material, and applied by machine
around the packet at the desired location, it is
especially important that the walls of the packet,
particularly in the area of application to the packet,
be srnooth. If the lid is offset inwardly or outwardly
of the body, it is difficult to properly apply the
tear strip. Indeed the strip may be damaged and may
thus need to be discarded, even though excise duty has
been prepaid for each unit length of tear strip.
The different requirements of the cigarette
manufacturers thus place exacting demands on the
packet manufacturer. The packet manufacturin~
industry is highly competitive and even apparently
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minor advances can have a significant affect on the
manufacturer's ability to obtain orders for his
packets.
Another important demand that cigarette
manufact rer's make is that new packet designs ~e
adapted to existing folding and assembly equipment in
their premises~ Clearly a cigarette manufacturer will
be reluctant ~o place orders for a new packet design,
however attractive, if the new design necessitates
replacement of existing folding and assembly equipment.
Prior proposals have been made for packets of
this general type, which may be formed from a single
blank. In this regard there may be mentioned U.S.
Patents 3,979,047; 4,196,842; 4,251,022 and
4,267,958 all assigned to Focke & Co. of Verden,
Federal Republic of Germany. There may also be
mentioned U.S. Patent 3,874,581 and Canadian Patent -
1,059,477 both assigned to Molins Limited o London,
England, and Canadian Patent 1,114,341 assigned to
British-American Tobacco Company Limited of England.
The first two Patentees are both machine or
equipment manufacturers. In designin~ packets their
basic objective is to sell new machines. None of
these packet designs has found commercial acceptance,
at least not in North America.
r
As exemplary of a hinged lid packet in which
the collar is formed from a separate blank there may be
mentioned Canadian Patent 1,056,783 assigned to Focke &
Co .
These prior single blank designs all have the
disadvantage that they are not suited to folding and
assembly on equipment designed for the folding and
assembly of the separate blanks designs. In addition
the individual designs have other disadvantages.
The Molins Patents and U.S. Patent 4,196,842
require deformation of the material of the collar portion
to d1splace the collar inwardly of the front wall of
the body. This is a difficult operation to reproduce
consistently; consequently, variation occurs i-n the
verysmall offset spacing between the collar and the
front wall in different packets. If this spacing does
not correspond exactly to the thickness of the mating
front and side walls of the lid, the lid will not be
lpcated so as to form smooth front and side walls in
the assembled packet.
U.S. Patent 3,979,047 particularly requires
that the collar be connected not only to the front
wall of the body but also to the side walls forming
flaps of the front wall, so as to form an inwardly off-
set collar in the æone of the front and side walls of the
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packet. In achieving this, relief apertures are formed
in the connection between the collar and the body.
U.S. Patent 4,267,958 employs connecting
bridges between the collar and the front wall.
U.S. Patent 4,251,022 is more especially
concerned with packets which require permanent moulding
of some of the flaps of the formed blanks by embossing
techniques.
Still another important requirement is to
provide a tamper evident packet. In other words the
packet should have a structure or appearance whereby
the customer will be able to determine if the packet
has been previously opened and the contents removed or
tampered with, when he first opens it.
A tamper evident feature has become especially
important recently as a result of activities of
criminal elements~
There have been several prior proposals for
tamper evident packets. In this regard there may be
mentioned U.S. Patents 4,314,643 ; 4,113,104; 3,893,614
and 4,284,197. The first three mentioned U.S. Patents
have the disadvantage that the tamperproof or tamper
evident feature produces an unsightly appearance after
the packet has been opened.
In U.S. Patents 4,314,643 and 3,893,614
adhesion spots and possibly a torn surface will remain
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on the front wall after opening the packet.
In U.S. Patent 4,113,104, a portion of the
front wall of the lid remains adhered to the front
wall of the packet.
In U.S. Patent 4,284,197 part of the front
wall of the packet is ripped out leaving a pattern of
projections intended to mate with corresponding
recesses on the ripped out section which is adhered
to the lid. The ripped out section detracts from the
appearance of the front wall of the packet in the
open configuration and if the projections and recesses
do not match exactly, the lid will not close snugly and
firmly to provide a rectangular cuboid with smooth
walls.
The present invention particularly seeks to
provide a hinged lid packet having a tamper evident
feature which does not damage or produce an unsightly
appearance in the front wall of the packet in the open
or closed conf`iguration.
The present invention seeks in a particular
embodiment, to provide such a hinged lid packet having
a tamper evident feature and formed from a single
blank, and which can be folded and assembled from
such single blank on conventional equipment employed
in the folding and assembly operations to produce
such a packet from separate blanks.
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In a further specific embodiment the invention
seeks to provide a hinged lid packet having a tamper
evident feature and formed from a single blank, in
which in the closed configuration the lid is flush
with the body to provide substantially smooth front
and side walls.
In accordance with the invention there is
provided a hinged lid packet comprising a lid portion
hinged to a body portion, said lid portion mating
with said body portion to form a cuboid with sub-
stantially smooth surfaces, a collar portion within
said packet, extending from said body portion into
said lid portion, a panel in said collar portion
secured to an inner face of said lid portion, the
panel being substantially separated from the collar
portion and removably connected to the collar portion
at spaced apart frangible connections.
When the packet is hingedly opened the frang-
ible connections are broken and the panel remains
secured to the lid to leave an access slot in the
collar portion.
In particular the panel is substantially
separated from the collar portion by a plurality of
elongated slits; the elongated slits being separated
by the frangible connections. In this way the elongated
slits and the frangible connections form a frangible line
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between the collar portion and the panel, and breaking
the frangible connections leaves a clean smooth edge
in the collar, defining an access slot.
In particular the panel is formed in the
collar portion by the elongated slits which pass com-
pletely through the collar portion; the frangible
connecting elements which separate the slits have the
form of short tabs or links and serve to connect the
panel to the~collar portion for ready removal there-
from. The frangible connecting elements are of astrength and dimension such that when the lid of the
packet is hingedly opened the connecting elements are
readily broken and the panel remains secured to the
- lid portion and is cleanly removed.
The panel is suitably secured to the inner
face of the lid portion by an adhesive, which provides
an attachment of the panel to the lid portion
significantly stronger than the weak attachment of
the panel to the collar portion, by the frangible
connecting elements.
Removal of the panel leaves a recess in the
collar portion defined by a generally clean edge
corresponding to the pattern of elongated slits.
The invention also provides a unitary
blank for such a packet.
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The invention is illustrated in particular
and preferred embodiments by reference to the
accompanying drawings in which:
FIGURE 1 is a perspective view which shows
a packet according to the invention
after having been opened;
FIGURE 2 is a side view showing the packet
of Figure 1 in a closed configuration;
FIGURE 3 is a plan view of the blank, inside
facing up from which the packet
of Figures 1 and 2 is made-
FIGURE 4 is a perspective view showing the
packet of Figure 1 partially
assembled from the blank of
Figure 3; and
FIGURE 5 is a view similar to Figure 1 show-
ing the closed packet wrapped in a
transparent foil with a tear strip
having an excise stamp.
With particular reference to Figures 1 and
4, a hinged lid packet 10 comprises a body 12, a lid
14 and a collar 16 disposed inwardly of body 12.
Lid 14 is hingedly connected to body 12
along a hinge line 18.
Body 12 includes upper side edges 20 and 22
and a front folded edge 24.
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Lid 14 includes side edges 26 and 28 and a
lid folded edge 30.
Ears 32 extend from collar 16.
With particular reference to Figure 4, a
removable panel 200 is connected to collar 16. With
particular reference to Figure 1 the panel 200 is
adhered to the inside of the lid 14 after packet 10
has been opened, and there is no damage to the collar
16 or body 12.
In the closed configuration shown in Figure
2 the side edges 20 and 22 and the folded edge 24
of body 12 matingly engage with the side edges 26 and
28 and the folded edge 30 of lid 14 to form a cuboid
with substantially smooth front and side surfaces
in which the lid 14 is flush with the body 12; the
surfaces being interrupted only by a line 33 extend-
ing across the front and sides of the cuboid and
merging with hinge line 18.
The structure of the body 12, lid 14 and
collar 16 are more particularly described hereinafter.
Body 12 includes a front wall 34, a rear
wall 36, a base wall 38 and side walls 40 and 42.
Fold lines 44 and 46 are formed between
front wall 34 and side walls 40 and 42 respectively
so that the front side edges of the body 12 are smooth.
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The lid 14 includes a front wall 50, a rear
wall 52, a top wall 54 and side walls 56 and 58.
Side wall 56 terminates at the afore-
mentioned side edge 26 and side wall 58 terminates at
the afore-mentioned side edge 28.
Fold line 60 is formed between front wall 50
and side wall 56 and fold line 62 is formed between
front wall 50 and side wall 58.
Reinforcing panel 64 extends along the inside
face of front wall 50 and top flaps 66 and 68 are
disposed in contact with the inside face of top wall
54.
Side flaps 70 and 72 are disposed adjacent
the interior faces of side walls 56 and 58.
The collar 16 comprises a front wall 80
and side walls 82 and 84.
Folds 88 and 90 are formed between front
wall 80 and side walls 82 and 84 respectively.
Slits 92 in folds 88 and 90 form the ears
32.
Removable panel 250 is connected to collar
16 by frangible connections 252 which are separated
by elongated slits 254 along a frangible line 256.
Removal of panel 250 from collar 16, by
breaking frangible connections 252 along frangible
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link 256 leaves an access slot 86 in front wall 80
as particularly shown in Figure 1. Access slot 86
has a clean, smooth edge 258 free of fraying.
~ith further reference to Figure 1, collar
16 has an upper edge 94 which includes opposed hori-
zontal side edges 96 at a rearmost portion of side
walls 82 and 84; inclined side edges 98 inclined down-
wardly from horizontal side edges 96 towards front
wall 80, and inclined front edges 100 in front wall
80.
With reference to Figure 3, there is shown
a blank 110 for forming the packet 10. The numbers
employed to identify the parts of packet 10 in
Figures 1 and 2 have been increased by 100 in identi-
fying the corresponding parts of blank 100.
Blank 110 includes a body-forming portion
112, a lid-forming portion 114 and a collar-forming
portion 116.
Body forming portion 112 includes a front
wall panel 134, a rear wall panel 136, a base wall
panel 138 and base flaps 125.
The side walls 40 and 42 of packet 10 are
formed by front side wall flaps 140a and 142a and
rear side wall flaps 140b and 142b.
-- 1.5
A crease and fold line 118 connects rear
wall panel 136 to lid-forming portion 114, and
defines the hinge line 18 of the packet 10.
A crease and fold line 124 connects front
wall panel 134 to collar-forming portion 116 and
defines the front folded edge 24 of the packet 10.
; Crease and fold lines 127 are formed between
front wall panel 134 and front side wall flaps 140a
and 142a.
Crease and fold lines 129 are formed between
rear wall panel 136 and rear side wall flaps 140b and
142b.
Crease and fold lines 131 are formed between
base flaps 125 and rear side wall flaps 140b and 142b.
Crease and fold lines 133a and 133b are
formed between base wall panel 138 and front and
rear wall panels 134, 136, respectively.
Side wall flaps 140a and 140b have inclined
edges 120a and 120b, respectively, which form side
edge 20 of packet 10.
Side wall flaps 142a and 142b have inclined
edges 122a and 122b, respectively, which form side
edge 22 of packet 10.
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. Lid-forming portion 114 includes a front
wall panel 150, a rear wall panel 152, a top wall
panel 154, outer side wall flaps 156 and 158, and the
reinforcing panel 64.
A crease and fold line 160 is formed between
front wall panel-150 an~ outer side wall flap 156;
and a crease and fold line 162 is formed between
front wall panel 150 and outer side wall flap 158.
A cr~ase and fold line 130 is formed between
reinforcing panel 64 and front wall panel 150. Crease
and fold line 130 forms the folded edge 30 of packet
10 .
A crease and fold line 157 is formed between
front wall panel 150 and top wall panel 154; and a
crease and fold line 159 is formed between top wall
panel 154 and rear wall panel 152.
Crease and fold lines 161 are formed
between top and side flaps 66 and 70, respectively,
and top and side flaps 68 and 72, respectively.
Crease and fold lines 163 are formed between
side flaps 70 and 72 and rear wall 52.
Arrowhead or V-shaped slots 165 are defined
between lid-forming portion 114 and body-forming
portion 112.
- 17 ~
Each arrowhead slot 165 includes a curved
head 167 spaced outwardly of the adjacent crease and
fold line 129, with a short cut 169 extending from
curved head 167 to the crease and fold line 118 which
forms hinge line 18.
Side flaps 70 and 72 each have an exposed
edge 171 defining one side of slot 165.
Each exposed edge 171 includes an inclined
edge 173 which diverges outwardly relative to the
opposed inclined edge 120b, 122b, respectively.
Inclined edge 173 terminates in a sub-
stantially horizontal edge 175.
Collar-forming portion 116 includes a front
wall panel 180, a spacer panel 181 and side wall
panels 182 and 184.
Removable panel 350 is connected to collar-
forming portion 116 by frangible connections 352 which
are separated by elongated slits 354 along a frangible
line 356.
Inclined upper edges 187 of collar-forming
portion 116 define the inclined side and front edges
98 and 100 of collar 116.
Perforated fold lines 188 and 190 between
front wall panel 180 and side wall panels 182 and
184, respectively, define the lines 88 and 90 of
collar 16.
- 18 -
A perforated fold line 191 is formed between
panels 180 and 181.
Side wall panels 182 and 184 have inclined
lower edges 193 and 195.
Large slots 197 and 199 are defined between
inclined lower edges 193 and 195 and 120a and 122a
respectively.
The folding along perforated fold line 191
and crease and fold line 124 produces a so-called
Z-fold formed by front wall 34, spacer panel 181
and front wall 80 of collar 16, fold 24 and the
fold at line 191.
With further reference to Figure 5, a
sealed packet 10 has a transparent foil wrapping
-200 and a tear strip 202 having a tear tab 204.
Tear strip 202 conseals line 33 on the
front face of carton 10. As currently used in Canada
the tear strip 202 bears the legend CIGARETTES.CANADA.-
CIGARETTES.DUTY PAID.DROIT ACQUIT., which legend is
repeated along the strip. Location of the tear strip
202 along line 33 leaves the remaining large surface
areas of the packet 10, bearing decorative and
information material, unobstructed.
In the assembly of the carton 10, the blank
110 is delivered in a horizontal path. Reinforcing
panel 64 is folded about crease and fold line 130 and
is adhered to the inside face of front wall panel
150, and collar-forming portion 116 is folded about
perforated fold line 191 and crease and fold line
124.
In this latter operation access is required
from the side and the large slots 197 and 199
facilitates handling and folding by existing equip-
ment employed in assembly of conventional two-blank
designs.
Spacer panel 181 is glued to the interior
face of front wall panel 134 of body forming portion
112.
In subsequent operations rear side wall
flaps 140b and 142b are folded about crease and
fold lines 120 and base flaps 125 are folded about
crease and fold lines 131.
Base wall panel 138 is folded about crease
and fold lines 133a and 133b, respectively.
Front wall flaps 140a and 142a are folded
about crease and fold lines 127 and the inside faces
of flaps 140a and 142a are glued to the outside faces
of flaps 140b and 142b. In this way the front side
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wall flaps form the outer surfaces of side walls 40
and 42 and smooth corners are formed at fold lines
44 and 46 on the front face of the packet 10.
With the folding of front side wall flaps
140a and 142a about crease and fold lines 127, side
walls 82 and 84 of collar 16 are formed by folding
side wall panels 182 and 184 about perforated fold
lines 188 and 190. The side walls 82 and 84 are
disposed inwardly of flaps 140b and 142b.
In this way the body 12 with the collar 16
and panel 250 spaced inwardly thereof is formed.
In the assembly of lid 14 top flaps 66 and
68 are folded about crease and fold lines 161 and
side flaps 70 and 72 are folded about crease and
fold lines 163, and top wall panel 154 is folded
~bout crease and fold line 159. In this way top
flaps 66 and 68 are disposed on top wall panel 154
to form top wall 54.
Front wall panel 150 is folded about crease
and fold line 157 and outer side wall flaps 156 and
158 are folded about crease and fold lines 160 and
162 respectively and the outer faces of side flaps
70 and 72 are glued to the inner faces of side flaps
156 and 158 to form side walls 56 and 58.
- 21 ~
The provision of arrowhead slots 165,
results in the exposed edge 171 of side flaps 70
and 72 being spaced inwardly of the side edges 26
and 28 defined by outer flaps 156 and 158. This
spacing provides some tolerance in the location of
flaps 70 and 72 against flaps 156 and 158 for
adhesion. Thus even if top flaps 66 and 68 are
slightly spaced from top wall panel 154 when flaps
70 and 72 are adhered to flaps 156 and 158,
respectively, the exposed edge 171 of side flaps
70 and 72 is still spaced inwardly of the side
edges 26 and 28 so that lid 14 can still be closed
to form a cuboid packet 10 with smooth surfaces
free of gaps at the juncture of lid 14 and body
12.
The ears 32 formed in the front sides of
collar 16 frictionally engage the inside of side
walls 56 and 58 thereby assisting in maintaining
the packet 10 in the closed configuration.
An assembly of cigarettes, typically
wrapped in a metallized paper foil is inserted in the
assembled packet.
Adhesive spots 260 are applied to the
front face of panel 250, or adhesive spots 262 may be
applied to the inwardly directed face of reinforcing
- 22 -
panel 64. It is also possible to apply adhesive
spots 256 to panel 20 and adhesive spots 258 to
panel 64. Lid 14 is closed so that panel 64 and
panel 250 are adhered together by adhesive spots 260
and/or 262.
In the closed configuration the horizontal
side edges 96 of collar 16 engage the top flaps 66
and 68. The inclination of side edges 98 and front
edges 100, on the other hand, facilitates closure
of the packet 10 by the effective removal of the
.front upper corners of collar 16 which would other-
wise engage reinforcing panel 64 during closure such
that closure of packet 10 would either crush or
deform the upper f`ront corners of collar 16, or the
front wall 50 of lid 14 would be deformed so that
a smooth front face would not be obtained on packet
10 .
By reference to Figure 3 it will be
observed that collar-forming portion 116 has two
major panels namely front wall panel 180 and spacer
panel 181. In particular spacer panel 181 has a
height at least two-thirds the height of front
wall panel 180.
~ ,'r~7~3
- 23 -
In addition side wall panels 182 and 184
which are connected to front wall panel 180 along
perforated fold lines 188 and 190 respectively, are
not connected at all to spacer panel 181 and are
spaced from perforated fold line l91o Suitably the
spacing of the inclined lower edges 193 and 195 of
side wall panels 182 and 184 respectively, from per-
forated fold line 191 is at least one-quarter the
height of spacer panel 181 so as to ensure that
relatively large slots 197 and 199 are formed to
facilitate side entry of conventional package
assembly equipment employed with two-blank designs,
in assembly.
The provision of panels 180 and 181 both of
major surface area with the side panels 182 and 184
connected to panel 180 and spaced a significant
distance from fold 1-91 represents a significant
difference over the single blank designs described
in the prior patents referred to above.
The lower edge 193 and 195 can also be made
perpendicular to fold lines 188 and 190, however, this
diminishes the si~e of slots 197 and 199, and in
particular the mouth of slo~ 197 formed at the outer
opposed corners of panel 182 and flap 140a, and the
mouth of slot 19 formed at the outer opposed corners
-24 -
of panel 182 and flap 142a, is then much narrower and
this hinders side access of the package assembly
equipment.
By forming edges 193 and 195 parallel to the
opposite edges 120 and 122a, respectively, of side
wall flaps 140a and 142a, the large slots 197 and
199 are formed with a wide mouth for access of the
equipment.
In blank 11~, the width of rear wall panel
136 of body-forming portion 112 is slightly narrower
than the width of front wall panel 134. More
especially in forming a substantially cuboid package
10,-the width of rear wall panel 136 plus four times
the thickness of the blank 110 (i.e., the thickness
of side walls 40 and 42 formed from flaps 140a and
140b and 142a and 142b respectively) equals the width
of front wall panel 134.
` The outer side edges of lid forming-portion
114 and body-formirlg portion 11~ of blank 110 are
substantially in line or form a straight line; and
the outer side edges of collar-forming portion 116
are spaced slightly inwardly or are offset inwardly
with respect to such line. In other words the
outer edge of side wall panel 182 of collar-forming
portion 116 is spaced slightly inwardly of a straight
line formed by the outer edge of front side wall
- 25 ~
flap 140a, base flap 125, rear side wall flap 140b,
side flap 70, top flap 66 and outer side wall flap
156.
The outer edge of side wall panel 184
has a similar relationshiP with the flaps of body-
forming portion llZ and lid-forming portion 114
on the opposed side of` blank 110.
Thus a substantially cuboid packet of the
hinged lid type, with smooth front and side walls,
is provided from a single blank using equipment
already employed by cigarette packing companies
for separate blank designs.
As can be seen in Figure 5 a transparent
foil wrapping 200 can be formed around such a package
in a conventional way, and a tear strip 202 indicating
that Excise Duty has been pre-paid can be applied
along the smooth juncture of the lid and body at
the front f`ace of the package 10.
On the other hand, the transparent foil
wrapping 200 is not employed in all embodiments.
The use of crease and fold lines in the
invention produces relatively curved, smooth corners,
whereas the use of perforated fold lines produces
relatively sharp edges.
- 26 -
When lid 14 is opened about the hinge, the
opening force is sufficient to break the frangible
connections 252 along frangible line 256 and panel
250 remains adhered to panel 64 of lid 14. It will
be recognized that additional force is required to
open packet 10 initially when the frangible connections
252 are to be broken, as compared with the force
required to reopen a packet 10, in which the
frangible connections have been previously broken.
The additional force required to break the frangible
connections will be apparent to the customer or user.
Thus it will be evident to the customer or user if
packet 10 has been previously opened.
