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Патент USA US3083628

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April 2, 1963
J. G. VERGOBB]
3,083,618
METHOD OF MAKING A LINER BAG
Filed Jan. 30, 1961
2 Sheets-Sheet 1
IN VEN TOR.
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_ ATTORNEY
April 2, 1953
J. G. VERGOBBI
3,083,618
METHOD OF MAKING A LINER BAG
Filed Jan. 30, 1961
2 Sheets-Sheet 2
I9
I8
43
44
.38
I,
26
2O 26 50
4s 43,
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50
/ £7910 -
WW,” 6. $222?
ATTORNEY
'
United States Patent O?ice
Patented Apr. 2, 1%63
2
7 633
J's-‘an G.METHGD
Vergohhi, GE‘
Q
03',{halt-5
Mlass”Aassignor
LENER to l’neumatic
§cale Corporation, Limited, Quincy, lVlass.J a corpora
tion of l‘vlassaehusetts
Filed inn. 36, 133331, See. No. 35,539
1 Gains. (Cl. 93—35)
This invention relates to a method of making a liner
bag for a package.
The invention has for ‘an object to provide a novel and
improved method of making a liner bag having an over
lapping side seam and a folded bottom closure wherein
novel revision is made for sealing the side seam and
“double package maker,” wherein the liner bag is formed
by wrapping the sheet about the forming block and seal
ing the overlapping portions of the side seam at one sta
tion of operation; folding and sealing the bottom closure
at a second station of operation; wrapping an outer bag or
carton about the forming block and its liner bag and
sealing the side seam of the outer at a subsequent station;
and folding and sealing the bottom closure of the outer
bag at another station, the completed lined bag or pack
age being then stripped from the forming block ready to
be ?lled and provided with a top closure.
Referring now to the drawings, 19 represents a rela
tively thin sheet of ?exible thermoplastic or other thermo
responsive liner bag material, overlapping portions of
the bottom closure in a manner such as to produce a 15 which are capable of being fused together upon the ap
leakproof and airtight bag.
With this general object in View and such others as may
hereinafter appear, the invention consists in ‘the method
of making a liner bag as hereinafter described and par
ticularly de?ned in the claim at the end of this speci?
cation.
In the drawings illustrating the preferred embodiment
of the invention:
FIG. 1 is a perspective View illustrating a sheet of liner
bag forming material wrapped about a forming block and
provided with a longitudinal overlapping side seam heat
sealed to form a tubular structure;
plication of heat and relatively slight pressure. In pro
ducing the bag, as shown in FIG. 1, the liner sheet 16 may
be wrapped about a horizontally extended forming block
12 to form an elongated tubular structure rectangular in
cross section, the longitudinal marginal edges V14, 1601'
‘the sheet being brought together in overlapping relation
and sealed along two relatively narrow spaced lines ‘18,
29 by the application of heat and pressure to provide a
longitudinally extended double line side seam disposed
substantially medially of the side walls of the tube, as in
dicated at 22. In practice the double line seam 22; may
be produced by an elongated heat sealing bar 24, as
FIG. 2 is a similar view showing the extended portions
shown in FIG. 6, provided with two spaced relatively
of the tube being folded to provide a bottom closure;
narrow elongated sealing projections or ridges l9 and 21
FIG. 3 is an end view showing the completely folded 30 and which cooperate with a resilient portion of the form~
bottom closure;
ing block which may comprise an insert 26 of rubberlike
FIGS. 4 and 5 are similar views of the folded bottom
material capable of withstanding heat. The heat sealing
closure showing the preferred sealing pattern employed
to produce a leakproof bottom closure;
operation effects softening and ?owing together of the
thermoplastic material of the overlapping portions to
FIG. 6 is an enlarged cross sectional view of the heat
sealed side seam taken on the line 6—6 of FIG. 2;
FIGS. 7 and 8 are enlarged cross sectional views of the
."folded bottom closure as taken on the lines ’7--7 of PEG.
form the fused or welded line seals .18, 20. In practice
the sealing ridges of the bar 24;- and the cooperating resil
ient insert 26 in the forming block 12 may be coated with
a suitable antistick material to prevent sticking of the
4 and 8--8 of FIG. 5, respectively, and showing the heat
softened material to the sealing elements.
.
40
sealed portions of the bottom closure;
During the operation of wrapping the liner sheet about
FIG. 9 is a perspective View of an outer bag wrapped
the forming block, opposed folding elements 28, 3d are
about the forming block and the liner bag; and
operated in sequence to :fold the marginal portions of the
FIG. 10 is a perspective view showing the completely
sheet across the upper surface of the horizontally ex
lined bag.
tended block in a manner such as to arrange the marginal
In general the present invention contemplates a novel 4.5 portions in overlapping relation, ‘and in operation the
and improved method of making a liner bag for a pack
folding elements 28, 3% remain at rest in the position
age wherein the liner bag may comprise a relatively thin
shown in FIG. 6 to retain the edges of the sheet in over
thermoplastic sheet material, such as, “Plio?lm,” prefer
lapping relation during the heat sealing operation. It
ably transparent, and capable of being heat sealed by the
will be observed that the liner sheet 19 extends beyond
50
application of heat and pressure to overlapping portions
the outer end of the block to provide extended wall por
thereof. In the illustrated embodiment of the invention
the thermoplastic sheet material is wrapped about a form
tions for forming the bottom closure at a subsequent sta
tion or" operation. It will also be observed that the double
ing block with the longitudinal marginal edges of the
line side seam 22 extends to the outer end of the forming
sheet arranged in overlapping relation, such marginal
block, the side seam terminating substantially ‘at the cor
55
edges being sealed together along relatively narrow spaced
ner of the block at the point indicated at 32, leaving the
lines by the application of heat and relatively slight
overlapping portions 34 of the extended wall free or un
pressure to form a tube. A portion of the tube extends
sealed. However, in operation the sealing bar 24 extends
beyond the outer end of the forming block for forming
a short distance beyond the end of the block so that in
the bottom closure, and opposed walls or" such extended
practice the side seam seal extends a short distance be
portion are folded inwardly against the bottom of the 60 yond the end of the corner of the block.
block in overlapping relation. Each inwardly folded wall
Thereafter, the opposed walls of the extended end Wall
of the extended portion forms a tapering or trapezoidal
portions of the tube are folded inwardly against the end
shaped ?ap connected by triangular shaped gussetlike
of the forming block in overlapping relation in a prede
folds which overlie the ?rst folded flaps and underlie the
termined sequence to form the bottom closure as illus
last folded ?aps. In accordance with the present inven
trated in FIGS. 2 and 3. In practice the upper and lower
tion the folded and overlapping portions of the bottom
extended end walls are first folded inwardly simultane
closure are heat sealed along predetermined spaced lines
ously against the end of the forming block by suitable
in a novel pattern such as to provide an airtight bottom
folding elements to provide tapering or trapezoidal shaped
closure.
flaps 36, 38, respectively. Then, the remaining opposed
The present liner bag is adapted to be produced on a 70 extended end walls are folded inwardly against the end
high speed packaging machine, known in the trade as a
of the forming block by suitable folding elements to lik -
8,083,618
4
wise provide tapering or trapezoidal shaped ?aps ‘40, 42,
minate inwardly of the sides of the block. In other words
respectively, the ?rst folded flaps 36, 38 being connected
to the last folded ?aps 40, 42‘ by triangular shaped gusset
like folds~43 which overlie the ?rst folded ?aps and under
ply portions of the end closure and terminate when they
reach the single ply portion thereof as shown. It will
the transverse seal lines are continued across the multi
be observed that the transverse seal lines intersect the ’
lie the last folded flaps as illustrated. vIt will be observed
vertical seal lines 44, 46.
that the ends of the ?rst folded ?aps are spaced apart in
As illustrated in FIG. 8, the transverse seals may be
the completed bottom fold, and the last folded ?aps are
produced by ‘a sealing pad 64 having a pair of upper
folded in a sequence such that the end of the ?ap 42 over
sealing ridges 65, 66 and ‘a pair of lower sealing ridges
laps a portion of the end ofV-the ?ap 40 as shown.
It will be observed that the tapering ?aps and the gus 1O 67, 68 which also cooperate with the resilient insert 50
provided in the end of the block. The transverse sealing
setl-ike connecting portions are open at their outer ends
operation also serves to fuse the multi-ply layers of
- and that the last folded ?aps 40, 42 overlie portions of
the bottom closure together to produce air-tight seals 7
' the ?rst folded ?aps 36, 38. Accordingly, the pattern
closing off any leakage between the flaps 36, 38 and the '
of heat sealing the bottom closure preferably contem
plates the provision of atidouble line heat seal across each 15 overlying portions of the closure. As seen in FIG. 8,
the cross section is taken at a point wherein the upper
?ap to seal the overlapping portions of the flaps together
transverse seal fuses together the underlying ?ap 36, in
andto close off any passageway through which air may
leak between the open ends and overlapping portions of ' termediate gusset portion 43 and overlying ?ap 42, and
the lower transverse seal fuses together the underlying
the flaps whereby to produce an airtight and leakproof
bottom closure for the bag.
.
,
20
,As illustrated in FIGS. 4 and 7, the overlapping end
portions of the ?aps 40, 42 are sealed to each other and
to portions of the underlying ?aps 36, 38 by a vertical
double line heat seal along lines 44, 46 closing the open
.endsof the flaps 40, 42 and also closing the remainder or
extended portion 34 of the overlapping side seam which
?ap 38, intermediate gusset portion 43 and the overlying
?ap 42.
It will be seen that the folded and sealed bottom closure
occurs in the bottom closure- As illustrated in FIG. 7,
thus de?ned provides an airtight and leakproof seal, each
seal comprising a double line seal bonding or welding
together the multi-ply portions in an area intermediate
the ends of the ?aps, each ?ap being sealed to adjacent
underlying and overlying portions of the folded closure.
the vertical end or bottom closure ‘seal lines 44, 46 are
While it is preferred to use double line seals, as shown,
the invention also contemplates single line seals in the
produced by a heat sealing bar- 48, having two spaced
and relatively narrow sealing ridges 45, and 47 which 30 areas de?ned. In the illustrated embodiment of the in
vention each of, the seal lines are preferably about $56
cooperate with a resilient portion 50 of rubberlike ma
terial inserted in the end of the forming block. The
vertical seal lines 44, 46 are coextensive with the side
of an inch in width and where double lines are used are
spaced apart from 1A3, to 5A6 of an inch. Relatively nar
row line seals are used in preference to relatively wider
sealed areas or lines because a greater ‘concentration of
heat may be applied along the narrow lines to quickly
seam seal lines 18, 20, and in practice the sealing bar
48 may extend ‘a short distance beyond the upper surface
of the forming block so that the upper ends of the seal
lines 44, 46 overlap the‘extended ends of the seal lines
18, 20 a short distance to assure a continuous side seam
seal at the corner portion 32 of the forming block. It
fuse the overlapping plies together, and while the sealing
1 elementsvare provided with an antistick coating it has
been found that more di?iculty is encountered in pre
will be observed that the seal lines 44, 46 terminate short
of the lower ‘end of the block at a point 49 immediately
beyond the overlapping ends of the ?aps 40, 42 as shown.
It will also be observed that the cross section shown in‘
FIG. 7 is taken at a point wherein ?ve plies of the thermo
plastic material are heat sealed together comprising the 45
?aps 40, 42, the connecting gusset portions 43 for each
flap and the underlying lower flap 38. It will also be
venting sticking of the softened thermoplastic material.
to wider sealing elements. Also, a relatively wide heat
seal is more subject to the formation of air bubbles be
tween the overlapping plies such as to form imperfect
seals. Since more uniform contact between the sealing
element and material may be attained with a narrow seal
ing element air bubbles between the plies are eliminated,
and the use of a double line seal further assures an air
tight seal.
‘
observed that the vertical double line heat seal is per
While'reference is made herein to ?rst folded ?aps and
formed while the folding elements indicated at 52, 54 are
at rest to retain the flaps in their folded condition during 50 last folded flaps, when describing the formation of the
bottom closure, in practice the ?aps are folded concur
the sealing operation. The heat sealing operation effects
fusion of the thermoplastic material along the lines 44,
46 to produce airtight seals as indicated in FIG. 7.
From the description thus far it will be seen that the
liner bag is provided with a heat sealed side seam and a 755
vertical bottom closure 'heat seal to continue the side
seam along the, extended portion 34 thereof and to seal
the open endsof the last folded ?aps 40, 42 to each other 7
rently from four sides during the initial portion of the
folding operation, the ?rst folding elements being re
tracted ‘before the second folding elements to complete
their operation, and the latter being moved in a sequence
such as to effect overlapping of the end of one ?ap with
the end of the other. Also, in practice the second folding
elements 52, 54 come to rest in spaced relation to retain. '
all of the ?aps in their folded condition during the vertical ’
and to the underlying portions of the ?rst folded flaps
36, 38 to thus seal the bottom closure ?om any leakage 60 line heat sealing operation whereupon they are fully‘
retracted.
which might otherwise occur between the folded flaps
'After completion of the liner'bag bottom closure an ~
40,’ 42 and the underlying flaps and between the over
outer sheet 70 .of bag material may be wrapped about
lapping portions of the side seam extension 34. There
the forming block and the bag carried thereby, and the
after, at a'subsequent station of operation, two double
line transverse heat sealing seams or ‘lines are applied 65 overlapping marginal portions of the sheet are adhesivel-y
sealed together to provide a side seam as indicated at 72,
to the'bot’tom closure, as shown in FIG. .5, in a pattern
in FIG. 9. The extended portions of the bag material
such as to seal the open ends of the ?rst folded ?aps 36,
may then be folded ‘against the end of the block and ad
38 to the overlying portions of the ?aps 40, 42. As here
hesively sealed together to provide a bottom closure 74
, in shown, the uppertransverse seam. is formed by spaced 70 as shown. The ‘lined bag may then be removed from‘the
seal lines 56, 58 which extend across an area de?ned by
forming block in the condition shown in FIG. 10 wherein
the underlying ?ap 36 and terminate inwardly of the
sides of the block. Likewise, the lower transverse seam
is formed ‘by spaced seal lines 60, 62 which extend across
76 represents the liner bag, ‘and 718Vrepresents the outer
bag. The bag thus produced may be delivered to a ?llir'ig
machine where the product to be packaged is deposited in ‘
an area de?ned by the underlying flap 38 and also ter 75 the lined bag.
3,083,618
6
5
The ?lled bag may then be provided with a top closure
in any usual or preferred manner to provide an airtight
top closure seal. The illustrated lined bag shows the
top or mouth of the liner bag flush with the top or
mouth of the outer bag, and in practice this type of
bag is adapted to be provided with a bellows or gusset
type fold and heat sealed by the application of heat and
pressure to seal the contacting mouth portions of the
the steps of folding a rectangular sheet of thermoplastic
bag forming material about a rigid forming block having
resilient portions with the longitudinal marginal edges
of the material in overlapping relation to form a rec
tangular tube with one end of the tube extended beyond
the end of the forming block, applying heat and rela
tively Slight pressure along two spaced relatively narrow
lines to the overlapping marginal edges in cooperation
with the resilient portions of the block to provide a fused
thermoplastic liner bag in airtight relation. A modi?ed
type of top closure may include a line seal across the 10 airtight side seam extending from the inner end of the
tube to a point slightly beyond the outer end of the
?attened mouth of the thermoplastic liner bag. It will
block leaving the remainder of the extended overlapping
be understood that the present liner bag may also be
side seam portions unsealed in the partially completed
used with advantage as a liner in other types of packages,
bag, folding opposed end walls of the extended end of the
such as a liner for a carton provided with the usual
15 tube inwardly against the end of the block to provide a
adhesively secured top and bottom closure ?aps.
The illustrated package when provided with a “Plio
?lm” liner bag having airtight seals, as described, is
bottom fold having trapezoidal shaped ?aps and having
portions in overlapping relation and connected by inter
vening triangular gusset folds forming multi-ply por
particularly adapted ‘for use as a container for ground
tions, the ends of the last folded ?aps arranged in over
coffee. One of the known characteristics of the “Plio
?lm” material is that it 'has some degree of porosity. 20 lapping relation, applying heat and relatively slight pres
sure along two relatively narrow spaced lines parallel
Thus, any increase in pressure within the sealed liner
bag caused by gas generated by the coffee may slowly
escape through the bag material, and such pressure with
in the bag will prevent air from the atmosphere from
entering the bag, thus maintaining the coffee in fresh 25
condition.
However, the present invention also con
to the outer ends of said last folded ?aps in cooperation
with the resilient portions of the block to fuse said ?aps
together and ‘to the underlying portions of the ?rst folded
opposed ?aps and the gusset folds in airtight relation, said
parallel spaced lines terminating a short distance be
yond the multi-ply portions of the bottom fold, then
applying heat and relatively slight pressure along two
pairs of relatively narrow spaced lines simultaneously in
While in the foregoing description the liner bag has 30 cooperation with said resilient portions, said pairs of
spaced lines being arranged intermediate the ends of each
been described as formed from a sheet of thermoplastic
of said ?rst folded ?aps and intersecting the lines seal
or thermoresponsive material it will be understood that
ing the ?rst folded ?aps to fuse the latter to the overlying
other sheet materials may be used, and such materials
last ‘folded ?aps and the gusset folds in airtight relation
coated in the predetermined areas to be sealed with heat
templates bags made from other materials which may
be non-porous and when sealed as described will pro
vide a hermetically sealed container.
and/or pressure sensitive adhesives such that the liner 35 to provide an airtight bottom closure, one pair of said
bag may be sealed along the predetermined seal lines
spaced lines being coextensive with the extended por
as herein described.
tions of said side seam seal lines, said two pairs of nar
row seal lines also terminating a short distance beyond
While the preferred embodiment of the invention has
been herein illustrated and described, it will be under
stood that the invention may be embodied in other forms
within the scope of the following claim.
‘Having thus described the invention, what is claimed
is:
The method of producing a liner bag which comprises 45
the multi-ply portions of the bottom fold.
References Cited in the ?le of this patent
UNITED STATES PATENTS
2,190,479
2,63 8,724
Moore ____________ __ Feb.
13,
1940
Harvey ______________ __ May 19, 11953
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