Abstrict The present invention relates generally to desiccant bags and filters
for use in receiver/dryers or accumulator canisters of automotive
air conditioning systems. More specifically, the present invention
relates to a dual or single desiccant bag provided with a filter
section such that the desiccant bag effectively combines two separate
components, a desiccant bag and a filter, into a single article.
Accordingly, the bag is adapted to contain adsorbent material therein
to adsorb moisture, or undesirable substances, within the a/c systems
of automobiles, trucks or other motor vehicles while the filter
is adapted to keep particles, dirt, or dust from entering the orifice
in the bight of a U-bend tube where oil pickup is provided for lubrication
of the a/c system.
Claims What is claimed is:
1. A desiccant bag made of porous fabric comprising:
a filter section comprising a wall portion disposed about a central
axis to define a sleeve;
first and second longitudinal end portions having opposing top
and bottom layers comprising a length and a width and having opposing
sides connecting said layers, said layers further having opposing
first and second ends, said second ends of said layers of said first
end portion and said second ends of said layers of said second end
portion being connected to form sealed ends, said first ends opposingly
and integrally joining said end portions with said outer wall so
that said first ends run parallel with said central axis and said
end portions extend outwardly therefrom;
a seam extending longitudinally across said bag for sealing said
bag lengthwise; and
first and second seals, said first seal sealing together said first
ends of said layers of said first end portion across said width
thereof adjacent said wall portion and said second seal sealing
together said first ends of said layers of said second end portion
across said width thereof adjacent said wall portion so that said
end portions define first and second compartments wherein said first
seal and said sealed end of said first end portion define opposing
ends of said first compartment and wherein said second seal and
said sealed end of said second end portion define opposing ends
of said second compartment, said first and second compartments having
a plurality of desiccant particles contained therein.
2. The desiccant bag as recited in claim 1 wherein said wall portion
further comprises first and second openings and has an aperture
located intermediate said openings.
3. The desiccant bag as recited in claim 1 wherein said porous
fabric comprises a non-woven fabric.
4. The desiccant bag as recited in claim 3 wherein said non-woven
fabric comprises needle punched polyester felt.
5. The desiccant bag as recited in claim 3 wherein said non-woven
fabric is selected from the group consisting essentially of spun
bonded felt, spun bonded nylon, and spun bonded polyolefin.
6. A desiccant bag made from a porous fabric comprising:
a filter section comprising a wall portion disposed about a central
axis to define a sleeve;
a longitudinal end portion having opposing top and bottom layers
comprising a length and a width and having opposing sides connecting
said layers, said layers further having opposing first and second
ends, said second ends connected to form a sealed end, and said
first ends integrally joining said end portion with said outer wall
so that said first ends runs parallel with said central axis and
said end portion extends outwardly therefrom;
a seam extending longitudinally across said bag for sealing said
bag lengthwise; and
first and second seals, said second seal sealing along the length
of the wall portion and said first seal sealing together said first
ends of said layers across said width of said end portion adjacent
said wall portion so that said end portion further defines a compartment
wherein said first seal and said sealed end of said first end portion
define opposing ends of said compartment, said compartment having
a plurality of desiccant particles contained therein.
7. The desiccant bag as recited in claim 6 wherein said wall portion
further includes first and second openings and an aperture located
intermediate said openings.
8. The desiccant bag as recited in claim 6 wherein said porous
fabric comprises a non-woven fabric.
9. The desiccant bag as recited in claim 8 wherein said non-woven
fabric comprises needle punched polyester felt.
10. The desiccant bag as recited in claim 8 wherein said non-woven
fabric comprises a member selected from the group consisting essentially
of spun bonded felt, spun bonded nylon, and spun bonded polyolefin.
11. The desiccant bag as recited in claim 6 wherein said first
seal and said second seal are in opposing relationship.
12. A method of making a desiccant bag comprising:
(a) providing a sheet of porous fabric having opposing longitudinal
and lateral side edges;
(b) connecting said longitudinal side edges to form a tube-like
structure comprising a width and having opposing top and bottom
layers, opposing sides connecting said layers, and opposing first
and second ends having openings;
(c) placing spaced first and second seals intermediate said ends
of said tube-like structure, said seals sealing across said width
of said tube-like structure and connecting said top layer with said
bottom layer so that said first and second ends define compartments
provided with said openings;
(d) cutting said opposing longitudinal sides of said tube-like
structure between said first and second seals lengthwise to form
a filter section having a wall portion disposed about a central
axis and having first and second openings to define a sleeve;
(e) placing desiccant particles in said compartments; and
(f) sealing said openings of said first and second ends so that
said ends have sealed ends for containing said particles within
said compartments.
13. A method of making a desiccant bag as recited in claim 12 wherein
connecting said longitudinal edges in step (b) forms a continuous
seam extending longitudinally across said tube-like structure.
14. A method of making a desiccant bag as recited in claim 12 wherein
said first and second seals in step (c) are placed via stitching.
15. A method of making a desiccant bag as recited in claim 12 wherein
said first and second seals in step (c) are placed via heat fusion.
16. A method of making a desiccant bag as recited in claim 12 wherein
said first and second seals in step (c) are placed via ultrasonic
sealing.
17. A method of making a desiccant bag as recited in claim 12 wherein
said openings are sealed in step (f) via stitching to form sealed
ends.
18. A method of making a desiccant bag as recited in claim 12 wherein
said openings are sealed in step (f) via heat fusion to form sealed
ends.
19. A method of making a desiccant bag as recited in claim 12 wherein
said openings are sealed in step (f) via ultrasonic sealing to form
sealed ends.
20. A method of making a desiccant bag as recited in claim 12 further
including providing an aperture in said filter section intermediate
said first and second openings of said wall portion.
21. A method of making a desiccant bag as recited in claim 12 wherein
said porous fabric comprises non-woven fabric.
22. A method of making a desiccant bag as recited in claim 21 wherein
said non-woven fabric comprises needle punched polyester felt.
23. A method of making a desiccant bag as recited in claim 21 wherein
said non-woven fabric is selected from the group consisting essentially
of spun bonded felt, nylon, and polyolefin.
24. A method of making a single desiccant bag comprising:
(a) providing a sheet of porous fabric having opposing longitudinal
and lateral side edges;
(b) connecting said longitudinal side edges to form a tube-like
structure comprising a width and having opposing top and bottom
layers, opposing sides connecting said layers, and opposing first
and second ends having openings;
(c) placing spaced first and second seals in said tube-like structure,
said second seal sealing together said top and bottom layers across
said width of said tube-like structure to seal said opening of said
second end, said first seal sealing together said top and bottom
layers across said width of said tube-like structure adjacent said
second seal so that said first end defines a compartment provided
with said opening of said first end;
(d) cutting said opposing longitudinal sides of said tube-like
structure between said first and second seals lengthwise to form
a filter section having a wall portion disposed about a central
axis and having first and second openings to define a sleeve;
(e) placing desiccant particles in said compartment; and
(f) sealing said opening of said first end so that said first end
has a sealed end for containing said particles within said compartment.
25. A method of making a desiccant bag as recited in claim 24 wherein
connecting said longitudinal edges in step (b) forms a continuous
seam extending longitudinally across said tubular structure.
26. A method of making a desiccant bag as recited in claim 24 wherein
said first and second seals in step (c) are placed via stitching.
27. A method of making a desiccant bag as recited in claim 24 wherein
said first and second seals in step (c) are placed via heat fusion.
28. A method of making a desiccant bag as recited in claim 24 wherein
said first and second seals in step (c) are placed via ultrasonic
sealing.
29. A method of making a desiccant bag as recited in claim 24 wherein
said openings are sealed in step (f) via stitching to form sealed
ends.
30. A method of making a desiccant bag as recited in claim 24 wherein
said openings are sealed in step (f) via heat fusion to form sealed
ends.
31. A method of making a desiccant bag as recited in claim 24 wherein
said openings are sealed in step (f) via ultrasonic sealing to form
sealed ends.
32. A method of making a desiccant bag as recited in claim 24 further
including providing an aperture in said filter section intermediate
said first and second openings of said wall portion.
33. A method of making a desiccant bag as recited in claim 25 wherein
said porous fabric comprises non-woven fabric.
34. A method of making a desiccant bag as recited in claim 33 wherein
said non-woven fabric comprises needle punched polyester felt.
35. A method of making a desiccant bag as recited in claim 33 wherein
said non-woven fabric is selected from the group consisting essentially
of spun bonded felt, spun bonded nylon, and spun bonded polyolefin.
Description FIELD OF THE INVENTION
This invention relates generally to desiccant bags and filters
for use in receiver/dryers or accumulator canisters of automotive
air conditioning systems. More specifically, it relates to a desiccant
bag provided with a filter section, and method of making same, such
that the desiccant bag effectively combines two separate components,
a desiccant bag and a filter, into a single article.
BACKGROUND OF THE INVENTION
Accumulators and receiver dryers in automotive air conditioning
systems utilize desiccant to adsorb moisture, or undesirable substances,
which can enter the system through fittings, hoses, connections,
and the like. One common method of containing desiccant within the
system is in a bag made of porous fabric which is retained in a
fixed position within an accumulator or receiver/dryer canister.
These canisters also commonly contain a U-bend tube, or pipe, with
an orifice in the outside bend at the bottom of the canister to
provide oil pickup for lubrication of the system. This orifice typically
is covered with a filter device, made of plastic, steel, or aluminum,
to assure that particles, dirt, or dust is not circulated into the
a/c system.
Accordingly, the present invention integrates a desiccant bag and
a filter into a single article such that bag is provided with a
filter section. This bag and filter combination is positioned at
the bottom of the U-bend tube so that the filter section covers
the orifice in the outside bend.
One significant advantage of the invention is cost reduction insofar
as the need for a separate filter assembly and a separate operation
to attach the assembly to the tube is eliminated. Also, the bag
can be fitted tightly around the tube thereby eliminating the possibility
of any large particles entering the orifice in the U-bend tube.
Accordingly, the invention provides a simple way for combining
a desiccant bag and a filter while at the same time reducing the
material and assembly costs associated with separate components.
Also, the desiccant bag keeps large particles from entering the
orifice in the U-bend tube.
SUMMARY OF THE INVENTION
The present invention includes a desiccant bag made from a sheet
of porous fabric. The bag comprises a filter section having a yoke,
or wall portion, disposed about a central axis to define a sleeve.
The bag further includes first and second longitudinal end portions
having opposing top and bottom layers comprising a length and a
width and having opposing sides connecting the layers. The layers
further have opposing first and second ends. The second ends of
the layers of the first end portion and the second ends of the layers
of the second end portion are connected to form sealed ends while
the first ends opposingly and integrally join the end portions with
the wall portion so that the first ends run parallel with the central
axis and the end portions extend outwardly therefrom.
Additionally, the bag comprises a seam extending across the bag
for sealing lengthwise and has first and second seals. The first
seal seals together the first ends of the layers of the first end
portion across the width thereof adjacent the wall portion and the
second seal seals together the first ends of the layers of the second
end portion across the width thereof adjacent the wall portion so
that the end portions define first and second compartments wherein
the first seal and sealed end of the first end portion define opposing
ends of a first compartment, and the second seal and sealed end
of the second end portion define opposing ends of a second compartment.
The first and second compartments are provided with a plurality
of desiccant particles contained therein.
Construction of the bag involves providing a sheet of porous fabric
having opposing longitudinal and lateral side edges and connecting
the opposing longitudinal side edges, such as by ultrasonic, heat
fusion and/or stitching procedures, to form a tube-like structure
comprising a width and having opposing top and bottom layers, opposing
sides for connecting the layers, and opposing first and second ends
having openings. Next, spaced first and second seals are placed
intermediate the ends of the tube-like structure. The seals seal
across the width of the tube-like structure connecting the top layer
with the bottom layer so that the ends define a compartment provided
with an opening.
The opposing longitudinal edges of the tube between the first and
second seals then are sliced lengthwise using a cutting tool or
die to form the filter section having a wall portion, or yoke, disposed
about a central axis and having first and second openings to define
a sleeve. Lastly, the compartments are filled with desiccant and
the openings sealed shut so that the ends form sealed ends for containing
particles within the compartments.
Accordingly, the filter section receives the end of a U tube through
its sleeve and the bag is easily slid thereon until the filter section
is situated over an orifice in the bight of a U-bend tube. The bag
fits around the U tube so that the filter section can act as a filtering
device at the orifice while gravity firmly holds the bag in the
canister thereby acting as a method to hold the bag in place. The
yoke can be adjusted to fit tightly over the U-bend tube once assembled.
In an alternate embodiment, the desiccant bag comprises only one
compartment for containing desiccant particles therein. In this
embodiment, a first seal is placed between the ends of the tube-like
structure substantially adjacent one opening. A second seal seals
this opening. Both seals seal across the width of the tube-like
structure and connect the top layer with the bottom layer. The single
end portion defines a compartment having an opening. The opposing
longitudinal sides of the tube-like structure between the seals
are sliced lengthwise using a cutting tool or die to form the filter
section. Lastly, the compartment is filled with desiccant and sealed
shut so that the end forms a sealed end for containing desiccant
particles within the compartment.
Notably, one can integrate different filter material into the wall
portion of the bag thereby allowing for different filter characteristics
as required by the manufacturer of the accumulator or receiver/dryer
canister. As such, if the porous bag material is thought to be too
dense to allow for proper lubricant pickup, then a more course filter
material may be used in the wall portion at the location where the
bag will position over the orifice.
Yet, a further embodiment of the invention involves providing an
aperture in the filter section between the first and second openings
of the sleeve so that the aperture can be positioned around a separate
filter which may already be assembled on the tube. As such, the
bag will still be located in place but will not act as a filter.
Therefore, it may be appreciated that an object of the present
invention is to provide a single or dual desiccant bag having a
filter integrated therein for reducing the material and assembly
costs associated with separate components.
It is a further object of present invention to provide both a dual
and single compartment desiccant bag having an aperture adapted
for receiving a filter on a U-bend tube.
Lastly, it is another object of the invention to provide a desiccant
bag with filter integrated therein that fits snugly around the bight
in a U-bend tube and keeps large particles from entering the orifice.
Other objects and advantages of the invention will be apparent
from the following description and the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a perspective view of a dual desiccant bag with integrated
filter in accordance with the invention.
FIG. 2 is the top view of a dual desiccant bag in accordance with
the invention as it is snugly and slidingly fitted over the upstanding
legs of a U-bend tube.
FIG. 3 is a schematic view showing positioning of the dual desiccant
bag in accordance with the invention over the orifice in the U-bend
tube shown in FIG. 2;
FIG. 4 is a side elevational view of another embodiment of the
invention in which the dual desiccant bag is provided with an aperture
therein in the filtering section so as to receive a filter from
the bight portion of the U-bend tube;
FIG. 5 is a top perspective view of a sheet of porous non-woven
fabric used to manufacture the dual and single desiccant bags of
the invention as shown in FIGS. 1 and
FIG. 6 is a bottom perspective view of the tube-like structure
formed by connecting the longitudinal edges of the sheet from FIG.
5;
FIG. 7 is a bottom perspective view of FIG. 6 after spaced first
and second seals are placed intermediate the ends of the tube-like
structure and the longitudinal sides of the structure are cut between
the seals;
FIG. 8 is a bottom perspective view of the tube-like structure
from FIG. 7 wherein the compartments have been sealed to form end
seals thereby forming a dual desiccant bag of the present invention
having a filter section integrated therein;
FIG. 9 is a perspective view of another embodiment showing a single
desiccant bag with integrated tube filter;
FIG. 10 is a schematic view of the embodiment shown in FIG. 5
showing the filter section positioned over the orifice;
FIG. 11 is a bottom perspective view of FIG. 6 after spaced first
and second seals are placed at one end of the tube-like structure
and the longitudinal sides of the structure are cut between the
seals; and
FIG. 12 is a bottom perspective view of the tube-like structure
from FIG. 11 wherein the compartment has been sealed to form an
end seal thereby forming a single desiccant bag of the present invention
having a filter section integrated therein.
DETAILED DESCRIPTION OF THE INVENTION
Turning to attached FIG. 1 there is shown a dual desiccant bag
10 of the present invention containing desiccant particles 12 (FIG.
7) therein for use in conjunction with refrigeration and/or drying
systems (not shown) that are commonly supplied in automobiles, trucks
or other motor vehicles (not shown).
The desiccant bag 10 is made from porous fabric 14 preferably
non-woven fabric such as needle punched polyester felts, spun bonded
felts, such as spun bonded polyester, spun bonded nylon and spun
bonded polyolefin, and other non-woven materials such as flash spun,
spunlaced, and meltdown polyester or nylons. The bag further includes
a filter section 16 comprising a wall portion 18 or yoke, disposed
about a central axis 20 and having first and second openings 68
and 70 to define a sleeve 22 so that the bag will snugly fit over
the U-bend tube 24 (FIG. 2) of an accumulator and/or receiver/dryer
structure (not shown) of an automotive refrigeration system and
the like (not shown).
FIG. 1 further shows the bag 10 comprising first and second longitudinal
end portions 26 and 28 having opposing top and bottom layers 30
and 32 comprising a width 36 and having opposing sides 38 and 40
connecting the layers 30 32. The layers 30 32 further have opposing
first and second ends 42 and 44. The second ends 44 of the layers
30 32 of the first end portion 26 and the second ends 44 of the
layers 30 32 of the second end portion 28 are connected to form
sealed ends 46 while the first ends 42 opposingly and integrally
join the end portions 26 28 with the wall portion 18 so that the
first ends 42 run parallel with the central axis 20 and the end
portions 26 28 extend outwardly therefrom. The sealed ends 46 may
be made via ultrasonic sealing means, heat fusion, stitching or
the like.
The bag 10 further comprises a seam 48 extending longitudinally
across the bag 10 for sealing the bag 10 lengthwise and has first
and second seals 50 and 52. The seam 48 may be made via ultrasonic,
heat fusion and/or stitching procedures. The first seal 50 seals
together the first ends 42 of the layers 30 32 of the first end
portion 26 across the width 36 thereof adjacent the wall portion
18 and the second seal 52 seals together the first ends 50 of the
layers 30 32 of the second end portion 28 across the width 36 thereof
adjacent the wall portion 18 so that the end portions 26 28 define
first and second compartments 54 and 56 wherein the first seal 50
and sealed end 46 of the first end portion 26 define opposing ends
of the first compartment 54 and the second seal 52 and sealed end
46 of the second end portion 28 define opposing ends of the second
compartment 56. The first and second compartments 54 56 are provided
with a plurality of desiccant particles 12 (FIG. 7) contained therein.
Notably, one can integrate different porous fabric 14 into the
wall portion 18 of the bag 10 thereby allowing for different filter
characteristics as required by the manufacturer of the accumulator
or receiver/dryer canister. For example, if the porous fabric 14
is thought to be too dense to allow for proper lubricant pickup,
then a more course fabric 14 may be used in the wall portion 18
at the location where the bag 10 will position over the orifice
58 (FIG. 2).
Turning to FIG. 2 there is shown a U-bend tube 24 of the type
normally encountered in automotive refrigeration systems (not shown).
This tube 22 comprises upstanding leg members 60 and 62 and bight
portion 64 connecting the upstanding legs 60 62. The sleeve 22
is snugly and slidably fit over upstanding leg 60 and is then positioned
as shown in FIG. 3 over the orifice 58 provided in the bight portion
64 of the tube 24.
FIG. 4 shows another embodiment of the bag 10 wherein the first
and second compartments 54 56 are again separated by a filter section
16. In this embodiment an aperture 66 is provided in the filter
section 16 between the first and second openings 68 70 of the wall
portion 18 so that the aperture 66 can be positioned to receive
a separate filter 67 or can be positioned around a separate filter
67 already assembled on the tube. As such, the bag 10 will still
be located in place but will not act as a filter.
In order to manufacture the dual desiccant bag 10 a sheet of porous
non-woven fabric 100 is provided having opposing longitudinal and
lateral side edges 102 and 104 as shown in FIG. 5. In FIG. 6 the
opposing longitudinal side edges 102 are connected, such as by ultrasonic
sealing, heat fusion and/or stitching procedures, to form a tube-like
structure 106 comprising a width 108 and having opposing top and
bottom layers 30 32 opposing sides 38 40 connecting the layers
30 32 and opposing first and second ends 110 and 112 having openings
114. The longitudinal side edges 102 are connected such that the
seam 48 extends longitudinally across the tube-like structure 106.
Next, spaced first and second seals 50 52 are placed intermediate
the ends 110 112 of the tube-like structure 106 as shown in FIG.
7. The seals 50 52 seal across the width 108 of the tubular structure
106 connecting the top layer 30 of the tube-like structure 106 with
the bottom layer 32 so that the first and second ends 110 112 define
first and second compartments 54 56 provided with openings 114.
Then, as further shown in FIG. 7 the opposing sides 38 40 between
the first and second seals 50 52 are sliced lengthwise using a
cutting tool or die (not shown) to form a filter section 16 having
a wall portion 18 or yoke, disposed about a central axis 20 and
having first and second openings 68 70 to define a sleeve 22. Lastly,
the compartments 54 56 are filled with desiccant 12 and sealed
shut via ultrasonic, heat fusion and/or stitching procedures, as
shown in FIG. 8 so that the ends 110 112 have sealed ends 46 for
containing particles 12 within the compartments 54 56.
If necessary, and in order to provide a bag 10 as shown in FIG.
4 an aperture 66 further is provided in the filter section 16
preferably intermediate the first and second openings 68 70 of
the wall portion 18.
Accordingly, as shown in FIGS. 2 and 3 once the bag 10 is completed,
the filter section 16 receives a leg 60 of the U-bend tube 24 through
its sleeve 22 and the bag 10 is easily slid thereon until the filter
section 16 is situated over the orifice 58. The bag 10 fits around
the tube 24 so the filter section 16 can act as a filtering device
at the orifice 58 while gravity firmly holds the bag 10 in the bottom
of a canister (not shown) thereby acting as a method to hold the
bag 10 in place. The wall portion 18 can be adjusted to fit tightly
over the U-bend tube 24 once assembled.
Turning now to the embodiment shown in FIG. 9 a single desiccant
bag 200 is shown.
In this embodiment, the desiccant bag 200 comprises only one compartment
54 for containing desiccant particles 12 (FIG. 11) therein. This
bag 200 similar to the dual desiccant bag 10 (FIG. 1), has a filter
section 16 comprising a wall portion 18 disposed about a central
axis 20 having first and second openings 68 70 to define a sleeve
22.
The bag 200 further includes a longitudinal end portion 26 having
opposing top and bottom layers 30 32 comprising a width 36 and
having opposing sides 38 40 connecting the layers 30 32. The layers
30 32 further have opposing first and second ends 42 44. The second
ends 44 are connected to form a sealed end 46 while the first end
42 is integrally joined with the wall portion 18 so that the first
end 42 runs parallel with the central axis 20 and the end portion
26 extends outwardly therefrom. The sealed end 46 may be sealed
via ultrasonic sealing means, heat fusion, stitching or the like.
The bag 200 also comprises a seam 48 extending longitudinally across
the bag 200 for sealing the bag 200 lengthwise and has first and
second seals 50 52. The seam 48 may be made via ultrasonic, heat
fusion and/or stitching procedures. The second seal 52 seals along
the length of the wall portion 18 and the first seal 50 seals together
the first ends 42 of the layers 30 32 of the end portion 26 across
the width 36 thereof adjacent the wall portion 18 so that the end
portion 26 defines a compartment 54 wherein the first seal 50 and
sealed end 46 of the end portion 26 define opposing ends of the
compartment 54. Preferably, the seals 50 52 are opposingly positioned
such that the filter section 16 is situated between the first and
second seals 50 52. Additionally, the second seal 52 may extend
outwardly from the wall portion 18. Lastly, the compartment 54 has
a plurality of desiccant particles 12 (FIG. 11) contained therein.
The artisan will appreciate that the single desiccant bag 200 shown
in FIG. 9 similar to the dual desiccant bag 10 (FIG. 1), may further
be provided with an aperture 66 (FIG. 4) in the filter section 16.
Also, the artisan will appreciate that one can integrate different
porous fabric 14 into the wall portion 18 of the bag 200 thereby
allowing for different filter characteristics.
FIG. 10 further shows the embodiment of FIG. 9 in its intended
position over the bight portion 64 of the U-bend tube 24 of an accumulator
or receiver/dryer (not shown). Here, the filter section 16 overlies
the orifice 58 in the tube 24.
The single desiccant bag 200 is manufactured similarly to the dual
desiccant bag 10 (FIG. 8) such that, as shown in FIG. 5 a sheet
of porous non-woven fabric 100 is provided having opposing longitudinal
and lateral side edges 102 104. And, as further shown in FIG. 6
the opposing longitudinal side edges 102 are connected, such as
by ultrasonic sealing, heat fusion and/or stitching procedures,
to form a tube-like structure 106 comprising a width 108 and having
opposing top and bottom layers 30 32 opposing sides 38 40 connecting
the layers 30 32 and opposing first and second ends 110 112 having
openings 114. The longitudinal side edges 102 are connected such
that the 48 seam extends longitudinally across the tube-like structure
106.
Next, as shown in FIG. 11 a first seal 50 is placed across the
width 108 of the tube-like structure 106 between the ends 110 112
thereof substantially adjacent the opening 114 of the second end
112 and a second seal 52 seals across the width 108 of the tube-like
structure 106 to seal the opening 114 of the second end 112. The
seals 50 52 connect the top layer 30 of the tube-like structure
106 with the bottom layer 32 and are placed using ultrasonic sealing,
heat fusion and/or stitching procedures. Accordingly, the first
seal 50 is placed such that the first end 110 defines a compartment
54 provided with an opening 114.
Next, as further shown in FIG. 11 the opposing sides 38 40 of
the tube-like structure 106 between the first and second seals 50
52 are sliced lengthwise using a cutting tool or die (not shown)
to form the filter section 16 disposed about a central axis 20 and
having first and second openings 68 70 to define a sleeve 22. Lastly,
the compartment 54 is filled with desiccant 12 and the opening 114
of the first end 110 sealed shut, as shown in FIG. 12 so that the
first end 110 has a sealed end 46 for containing particles 12 within
the compartment 54. The sealed end 46 is formed via ultrasonic,
heat fusion and/or stitching procedures.
Accordingly, the dual and single desiccant bags of the present
invention effectively eliminates the need for a separate filter
assembly and separate desiccant bag. As such, the bag of the present
invention provides a simple way for combining the bag and filter
while at the same time reducing the material and assembly costs
associated with separate components. Also, the desiccant bag further
keeps large particles from entering the orifice in the U-bend tube.
While the forms of apparatus herein described constitute preferred
embodiments of the invention, it is to be understood that the invention
is not limited to these precise forms of apparatus, and that changes
may be made therein without departing from the scope of the invention. |