CA1064871A - Methods of forming evacuated sealed packs, particularly of foods - Google Patents
Methods of forming evacuated sealed packs, particularly of foodsInfo
- Publication number
- CA1064871A CA1064871A CA263,272A CA263272A CA1064871A CA 1064871 A CA1064871 A CA 1064871A CA 263272 A CA263272 A CA 263272A CA 1064871 A CA1064871 A CA 1064871A
- Authority
- CA
- Canada
- Prior art keywords
- bag
- nozzle
- mouth
- steam
- lateral
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
- B65B31/00—Packaging articles or materials under special atmospheric or gaseous conditions; Adding propellants to aerosol containers
- B65B31/04—Evacuating, pressurising or gasifying filled containers or wrappers by means of nozzles through which air or other gas, e.g. an inert gas, is withdrawn or supplied
- B65B31/06—Evacuating, pressurising or gasifying filled containers or wrappers by means of nozzles through which air or other gas, e.g. an inert gas, is withdrawn or supplied the nozzle being arranged for insertion into, and withdrawal from, the mouth of a filled container and operating in conjunction with means for sealing the container mouth
Landscapes
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Vacuum Packaging (AREA)
- Packages (AREA)
Abstract
Abstract:-A method of forming an evacuated sealed pack especially pouches for food in which a flattened nozzle injects steam into a bag to purge air from its interior and form a vacuum, while applying tensile forces across the bag mouth to flatten the bag mouth against the nozzle, after which while retaining these forces the nozzle is removed without loss of the vacuum.
Description
8'7~
;
The present ~nvention relates to a method of ~orming evacuated sealed packs, particularly packs containing preserved foodstuffs.
~any vacuum packing methods are ~nown, and in general these require relatively expensive equipment. The present inve~tion is concerned with providing a method which can be used in conjunction with existing for~-flll seal or other bag ~illing machinery, without extensive modi~ication.
Thus, the present invention aims to be able to convert for e~ample a normal, e~isting fill seal machine into a vacuum packing machine at low cost.
Accordingly the invention provides a method of for~ing an evacuated sealed pac~ comprising the steps o~ providing an open ~outh bag containing the product to be packed, r O~
~- 15 inserting a steam injection nozzle into the mouth zone of ~ said bag, injecting steam via said nozzle into the bag so -~ as to purge air from the interior of said bag, applying tensile forces acrosC a lateral zone o~ the bag mouth so as to laterally stretch the bag and flatten said bag mouth onto ,.
the nozzle, withdrawing the nozzle from the bag while retaining lateral tensile forces in said lateral zone and thereby allowing the flattened bag to progressively close behind the nozzle, and sealing the closed evacuated bag.
The steam nozzle should have a flattened shape so that the bag mouth can adequately flatten on to it and minimise gas lea~age.
It will be recognised that the steam both purges the bag of air and by virtue o~ condensation causes a vacuum to be . .
" ~;
. ~ . . . . . . .
. ;~ - . ~ . . . ... .. . .. .
' - ' ' ' ' . ' , : . '. ' .'' .'. . ~ ~. ' ' ': ' ,, : .. . ~ .
l~ t7~,, .
produced in the bag. Also,the method involving stretching in co~junction with use of a flattened nozzle enables the nozzle to be removed from the bag without brea~ing the , vacuum. Use of steam i9 ~nown for vacuum pac~ing, but hitherto a satisfactory economical method o~ retaining the vacuum and sealing has not been achieved.
Use of steam implies the introduction of a degree o~
moisture, and therefore it will be understood that the :;
'~ invention is not applicable to the pac~ing o~ products which would be a~fected by moisture, for example dried : powdered materials. Alsoythe use of steam to flush and purge out air from the bag can only be used where the product to be packed is suitable for such air purging.
Thus,-where the product includes small air packets which lS would resist the steam flushing the invention would ~ot be suitable, for egample particulate materials li~e peas.
i~ . . . .
: On the other hand, the invention is particularly applicable ' for pac~ing pieces of meat, or of other integral productswhich form a composite whole ~or example by the presence ~ . . .
- 20 of a sauce or gravy.
The nozzle should be sufficiently flattened in shape so -~ that when the bag mouth is ~lattened on to the nozzle the bag mouth is virtually closed by this operation. In practice while steam is still being injected into the bag it is not necessary that fulI closing of the bag occars at this stage, since the steam and purged air will be escaping under slight over pressure and an effective one way valve is . ...... .
. .
. ~
:;
::;
106~B~
~ achieved. However at the next stage in the process as the -.~
nozzle is ta~en out of the bag, a per~ect closing is achieved by the lateral stretching, and the vacuam is retained.
Following formation of the vacuum it is preYerable to ~-~ retain the lateral stretching until a permanent seal has been made on to the bag. Thig seal, usually a heat seal, - is preferably effected over a fairly wide band (e.g. about 12 mm) in the mouth zone of the bag so as to ensure that an~
steam bubbles or prodact particles in the region of the ~;; seal zone are trapped.
. An embodiment of the invention will now be described by 't:
~ way of e~ample with reference to the ùiagrammatic drawings.
',J~ ' Figure 1 is a side elevation o~ a bag with an injection nozzle located above it prior to commencement of the processi .:., .
Figure 2 is a plan view of the bag and nozzle in the Figure l position;
Figure 3 is a side elevation of the bag after an injection nozzle has been inserted therein;
.; . .
Figure 4 lS a plan view of the Figure 3 arrangement; and Figare S is a graphical representation of the . timing sequence.
.~......................................................... .
Referring to Figure l a bag 1, ~illed with a product to ~` 25 be packed for e~ample two pieces of preserved ~eat, is held ;~ between side grippers 2. Referring to Figure 2 it can be seen that in this condition the bag mouth is open. Located above the open mouth of the bag is a flattened divergent , ~ ~ . . ' ' , ~ ' .
steam injection nozzle 3. The nozzle 3 is supported by means permitting it to be inserted into and withdrawn from the mouth of the bag 2. The nozzle is connected to a supply of ` pressurized steam. The nozzle has a flattened depth which is less than the width of the open rnouth bag and its width is about a third the length of the bag mouth opening, so that it can readily enter into said bag.
The next stage of the process is that the nozzle is inserted into the bag and steam is injected into the bag. Due to the divergent shape of the injection nozzle, the steam, :. .
injected at a pressure of between 0.5 and 0.9 atm above atmos-pheric, is able to be forced into the lower corners of the bay and is thereby able to purge air out of the bag.
Referring to Figure 3, the grippers 2 are spring loaded - 15 and are supported by means permitting them to be moved apart so ~ as to provide tensile forces across a lateral zone 4 of the bag '~-...
. mouth, through which zone of the bag mouth the nozzle passes, so ; as to flatten the bag onto the nozzle and almost close the bag ~ -(see Figure 4).
The spring loaded stretching across the zone 4 causes the bag to form a one way valve which enables the purged air and ; steam to continue to pass out of the bag without further air ~' ~
~ being able to enter the bag. There are, in practice, slight gaps - S at the corners of the nozzle as can be seen from Figure 4 but , 25 the over pressure from the steam ensures that air and steam can only flow outwards so that air cannot enter the bag.
' The next stage in the process is that steam pressu~e is shut off and the steam injection nozzle is drawn out of the bag while retaining the lateral stretching across the ............................................................................ .
_ 5 ,.` ~
,: . .. ~ .
7::~
zone 4. .~9 the nozzle moves out o-f the bag the bag walls -`~ in the laterally stretched zone 4 come together and ~¢` completely close the bag without loss of vacuu~.
~hereafter while retaining the lateral tension in the zone 4, the bag i9 moved to a heat sealing station and there a heat seal is placed just above the zone 4 so as to provide an evacuated sealed pack.
In practice bags made of a heat sealable foil laminate (12 micron polyester laminated with 9 micron aluminium and r 10 70 micron modified high de~sity polyethylene) was used on bags measuring 170 mm ~ 200 mm. Tension o-f 3 to 4 kg laterally across the bag served to adequately seal the bag, , and the nozzle of diver~ent shape had a width which was about 7 a third that ofthe open mouth of the bag i.e. 60 mm. Its depth externally was 3 to 3~5 mm giving an internal depth of 1 to 1A5 mm.
,:,...
Figure 5 shows the time sequence of the varioas :`
operations schematically. In this Figure, on a linear time scale, the function A represents the time o~ the nozzle within the bag (the sloping parts at each end being representative of entry and withdrawal); the funotion B
represents the time of steam flushing (about 1 to 1.5 seconds ,. ~
in practice); and the function C represents the timing of the stretching of the baE moath, this commencing about 0.3 seconds after the commencement of steam flushing.
i , '`~
`'`
. ~ .
... . ,, -. . .
. . ~ .. , .:
. :- .
,: , ~ .
;
The present ~nvention relates to a method of ~orming evacuated sealed packs, particularly packs containing preserved foodstuffs.
~any vacuum packing methods are ~nown, and in general these require relatively expensive equipment. The present inve~tion is concerned with providing a method which can be used in conjunction with existing for~-flll seal or other bag ~illing machinery, without extensive modi~ication.
Thus, the present invention aims to be able to convert for e~ample a normal, e~isting fill seal machine into a vacuum packing machine at low cost.
Accordingly the invention provides a method of for~ing an evacuated sealed pac~ comprising the steps o~ providing an open ~outh bag containing the product to be packed, r O~
~- 15 inserting a steam injection nozzle into the mouth zone of ~ said bag, injecting steam via said nozzle into the bag so -~ as to purge air from the interior of said bag, applying tensile forces acrosC a lateral zone o~ the bag mouth so as to laterally stretch the bag and flatten said bag mouth onto ,.
the nozzle, withdrawing the nozzle from the bag while retaining lateral tensile forces in said lateral zone and thereby allowing the flattened bag to progressively close behind the nozzle, and sealing the closed evacuated bag.
The steam nozzle should have a flattened shape so that the bag mouth can adequately flatten on to it and minimise gas lea~age.
It will be recognised that the steam both purges the bag of air and by virtue o~ condensation causes a vacuum to be . .
" ~;
. ~ . . . . . . .
. ;~ - . ~ . . . ... .. . .. .
' - ' ' ' ' . ' , : . '. ' .'' .'. . ~ ~. ' ' ': ' ,, : .. . ~ .
l~ t7~,, .
produced in the bag. Also,the method involving stretching in co~junction with use of a flattened nozzle enables the nozzle to be removed from the bag without brea~ing the , vacuum. Use of steam i9 ~nown for vacuum pac~ing, but hitherto a satisfactory economical method o~ retaining the vacuum and sealing has not been achieved.
Use of steam implies the introduction of a degree o~
moisture, and therefore it will be understood that the :;
'~ invention is not applicable to the pac~ing o~ products which would be a~fected by moisture, for example dried : powdered materials. Alsoythe use of steam to flush and purge out air from the bag can only be used where the product to be packed is suitable for such air purging.
Thus,-where the product includes small air packets which lS would resist the steam flushing the invention would ~ot be suitable, for egample particulate materials li~e peas.
i~ . . . .
: On the other hand, the invention is particularly applicable ' for pac~ing pieces of meat, or of other integral productswhich form a composite whole ~or example by the presence ~ . . .
- 20 of a sauce or gravy.
The nozzle should be sufficiently flattened in shape so -~ that when the bag mouth is ~lattened on to the nozzle the bag mouth is virtually closed by this operation. In practice while steam is still being injected into the bag it is not necessary that fulI closing of the bag occars at this stage, since the steam and purged air will be escaping under slight over pressure and an effective one way valve is . ...... .
. .
. ~
:;
::;
106~B~
~ achieved. However at the next stage in the process as the -.~
nozzle is ta~en out of the bag, a per~ect closing is achieved by the lateral stretching, and the vacuam is retained.
Following formation of the vacuum it is preYerable to ~-~ retain the lateral stretching until a permanent seal has been made on to the bag. Thig seal, usually a heat seal, - is preferably effected over a fairly wide band (e.g. about 12 mm) in the mouth zone of the bag so as to ensure that an~
steam bubbles or prodact particles in the region of the ~;; seal zone are trapped.
. An embodiment of the invention will now be described by 't:
~ way of e~ample with reference to the ùiagrammatic drawings.
',J~ ' Figure 1 is a side elevation o~ a bag with an injection nozzle located above it prior to commencement of the processi .:., .
Figure 2 is a plan view of the bag and nozzle in the Figure l position;
Figure 3 is a side elevation of the bag after an injection nozzle has been inserted therein;
.; . .
Figure 4 lS a plan view of the Figure 3 arrangement; and Figare S is a graphical representation of the . timing sequence.
.~......................................................... .
Referring to Figure l a bag 1, ~illed with a product to ~` 25 be packed for e~ample two pieces of preserved ~eat, is held ;~ between side grippers 2. Referring to Figure 2 it can be seen that in this condition the bag mouth is open. Located above the open mouth of the bag is a flattened divergent , ~ ~ . . ' ' , ~ ' .
steam injection nozzle 3. The nozzle 3 is supported by means permitting it to be inserted into and withdrawn from the mouth of the bag 2. The nozzle is connected to a supply of ` pressurized steam. The nozzle has a flattened depth which is less than the width of the open rnouth bag and its width is about a third the length of the bag mouth opening, so that it can readily enter into said bag.
The next stage of the process is that the nozzle is inserted into the bag and steam is injected into the bag. Due to the divergent shape of the injection nozzle, the steam, :. .
injected at a pressure of between 0.5 and 0.9 atm above atmos-pheric, is able to be forced into the lower corners of the bay and is thereby able to purge air out of the bag.
Referring to Figure 3, the grippers 2 are spring loaded - 15 and are supported by means permitting them to be moved apart so ~ as to provide tensile forces across a lateral zone 4 of the bag '~-...
. mouth, through which zone of the bag mouth the nozzle passes, so ; as to flatten the bag onto the nozzle and almost close the bag ~ -(see Figure 4).
The spring loaded stretching across the zone 4 causes the bag to form a one way valve which enables the purged air and ; steam to continue to pass out of the bag without further air ~' ~
~ being able to enter the bag. There are, in practice, slight gaps - S at the corners of the nozzle as can be seen from Figure 4 but , 25 the over pressure from the steam ensures that air and steam can only flow outwards so that air cannot enter the bag.
' The next stage in the process is that steam pressu~e is shut off and the steam injection nozzle is drawn out of the bag while retaining the lateral stretching across the ............................................................................ .
_ 5 ,.` ~
,: . .. ~ .
7::~
zone 4. .~9 the nozzle moves out o-f the bag the bag walls -`~ in the laterally stretched zone 4 come together and ~¢` completely close the bag without loss of vacuu~.
~hereafter while retaining the lateral tension in the zone 4, the bag i9 moved to a heat sealing station and there a heat seal is placed just above the zone 4 so as to provide an evacuated sealed pack.
In practice bags made of a heat sealable foil laminate (12 micron polyester laminated with 9 micron aluminium and r 10 70 micron modified high de~sity polyethylene) was used on bags measuring 170 mm ~ 200 mm. Tension o-f 3 to 4 kg laterally across the bag served to adequately seal the bag, , and the nozzle of diver~ent shape had a width which was about 7 a third that ofthe open mouth of the bag i.e. 60 mm. Its depth externally was 3 to 3~5 mm giving an internal depth of 1 to 1A5 mm.
,:,...
Figure 5 shows the time sequence of the varioas :`
operations schematically. In this Figure, on a linear time scale, the function A represents the time o~ the nozzle within the bag (the sloping parts at each end being representative of entry and withdrawal); the funotion B
represents the time of steam flushing (about 1 to 1.5 seconds ,. ~
in practice); and the function C represents the timing of the stretching of the baE moath, this commencing about 0.3 seconds after the commencement of steam flushing.
i , '`~
`'`
. ~ .
... . ,, -. . .
. . ~ .. , .:
. :- .
,: , ~ .
Claims (3)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A method of forming an evacuated sealed pack comprising the steps of:
a) providing an open mouth bag containing a product to be packed;
b) inserting a steam injection nozzle of divergent flattened shape opening downwardly at its lower end into the mouth zone of said bag;
c) injecting pressurized steam via said nozzle into the bag so that steam is forced into the lower corners of the bag so as to purge air from the interior of said bag;
d) applying tensile forces from opposing side grippers across a lateral zone of the bag mouth so as to laterally stretch the bag and flatten the bag mouth onto the nozzle so that the bag mouth forms a one-way valve;
e) withdrawing the nozzle from the bag while retaining the lateral tensile forces from opposing side grippers in said lateral zone so that the bag progressively closes behind the nozzle, and f) sealing the closed evacuated bag.
a) providing an open mouth bag containing a product to be packed;
b) inserting a steam injection nozzle of divergent flattened shape opening downwardly at its lower end into the mouth zone of said bag;
c) injecting pressurized steam via said nozzle into the bag so that steam is forced into the lower corners of the bag so as to purge air from the interior of said bag;
d) applying tensile forces from opposing side grippers across a lateral zone of the bag mouth so as to laterally stretch the bag and flatten the bag mouth onto the nozzle so that the bag mouth forms a one-way valve;
e) withdrawing the nozzle from the bag while retaining the lateral tensile forces from opposing side grippers in said lateral zone so that the bag progressively closes behind the nozzle, and f) sealing the closed evacuated bag.
2. A method as claimed in claim 1 in which said grippers grip onto the exterior of the bag on either side of the bag mouth.
3. An apparatus for forming a sealed pack of the type in which a product is filled into the open mouth of a bag and said mouth is subsequently sealed, said apparatus comprising a source of pressurized steam and connected thereto a flattened steam injection nozzle of divergent shape; means for inserting the nozzle into the bag mouth adapted to inject pressurized steam into the lower corners of the bag to purge air from its interior;
a pair of side grippers for gripping the bag mouth and applying tensile forces across a lateral zone of the bag mouth to laterally stretch the bag and flatten the bag mouth onto the nozzle as a one-way valve, and means for withdrawing the nozzle from the bag while said lateral forces are applied.
a pair of side grippers for gripping the bag mouth and applying tensile forces across a lateral zone of the bag mouth to laterally stretch the bag and flatten the bag mouth onto the nozzle as a one-way valve, and means for withdrawing the nozzle from the bag while said lateral forces are applied.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB41854/75A GB1564399A (en) | 1975-10-13 | 1975-10-13 | Methods of forming evacuated sealed packs particularly of foods |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1064871A true CA1064871A (en) | 1979-10-23 |
Family
ID=10421650
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA263,272A Expired CA1064871A (en) | 1975-10-13 | 1976-10-13 | Methods of forming evacuated sealed packs, particularly of foods |
Country Status (12)
| Country | Link |
|---|---|
| JP (1) | JPS5286890A (en) |
| AU (1) | AU497316B2 (en) |
| BE (1) | BE847192A (en) |
| CA (1) | CA1064871A (en) |
| DE (1) | DE2645882A1 (en) |
| DK (1) | DK458276A (en) |
| FI (1) | FI57376C (en) |
| FR (1) | FR2327927A1 (en) |
| GB (1) | GB1564399A (en) |
| NL (1) | NL7611285A (en) |
| NO (1) | NO763475L (en) |
| SE (1) | SE428006B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT1073818B (en) * | 1976-01-19 | 1985-04-17 | Fmc Corp | DEVICE AND PROCEDURE FOR FILLING BAGS AND SIMILAR FLEXIBLE CONTAINERS |
| JPS5458592A (en) * | 1977-10-18 | 1979-05-11 | Daido Oxygen | Method of sealing and packaging inert gas |
| DE3111611C1 (en) * | 1981-03-25 | 1982-09-30 | Elektro-Thermit Gmbh, 4300 Essen | Process for preventing segregation of an aluminothermic mixture |
| JPS57175523A (en) * | 1981-04-22 | 1982-10-28 | Toyo Jidoki Kk | Replacing packing method for inert gas |
| JP2008143576A (en) * | 2006-12-12 | 2008-06-26 | Toyo Jidoki Co Ltd | Air-by-steam-replacement deaeration method for use in bag packaging and nozzle for use in method |
-
1975
- 1975-10-13 GB GB41854/75A patent/GB1564399A/en not_active Expired
-
1976
- 1976-10-11 AU AU18552/76A patent/AU497316B2/en not_active Expired
- 1976-10-11 DE DE19762645882 patent/DE2645882A1/en not_active Ceased
- 1976-10-12 JP JP12219176A patent/JPS5286890A/en active Pending
- 1976-10-12 FR FR7630601A patent/FR2327927A1/en active Granted
- 1976-10-12 SE SE7611323A patent/SE428006B/en unknown
- 1976-10-12 BE BE171436A patent/BE847192A/en not_active IP Right Cessation
- 1976-10-12 DK DK458276A patent/DK458276A/en unknown
- 1976-10-12 NO NO763475A patent/NO763475L/no unknown
- 1976-10-12 FI FI762903A patent/FI57376C/en not_active IP Right Cessation
- 1976-10-13 NL NL7611285A patent/NL7611285A/en not_active Application Discontinuation
- 1976-10-13 CA CA263,272A patent/CA1064871A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| AU497316B2 (en) | 1978-12-07 |
| DE2645882A1 (en) | 1977-04-14 |
| NL7611285A (en) | 1977-04-15 |
| FI762903A (en) | 1977-04-14 |
| FR2327927B1 (en) | 1980-04-25 |
| JPS5286890A (en) | 1977-07-19 |
| FI57376B (en) | 1980-04-30 |
| GB1564399A (en) | 1980-04-10 |
| FI57376C (en) | 1980-08-11 |
| FR2327927A1 (en) | 1977-05-13 |
| AU1855276A (en) | 1978-04-20 |
| SE428006B (en) | 1983-05-30 |
| NO763475L (en) | 1977-04-14 |
| SE7611323L (en) | 1977-04-14 |
| BE847192A (en) | 1977-04-12 |
| DK458276A (en) | 1977-04-14 |
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