US20100018169A1 - Vacuum generating device for sealing perishable products and method of use - Google Patents
Vacuum generating device for sealing perishable products and method of use Download PDFInfo
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- US20100018169A1 US20100018169A1 US12/586,452 US58645209A US2010018169A1 US 20100018169 A1 US20100018169 A1 US 20100018169A1 US 58645209 A US58645209 A US 58645209A US 2010018169 A1 US2010018169 A1 US 2010018169A1
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- vacuum
- elastic membrane
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- lid
- rim
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D81/00—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents
- B65D81/18—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents providing specific environment for contents, e.g. temperature above or below ambient
- B65D81/20—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents providing specific environment for contents, e.g. temperature above or below ambient under vacuum or superatmospheric pressure, or in a special atmosphere, e.g. of inert gas
- B65D81/2007—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents providing specific environment for contents, e.g. temperature above or below ambient under vacuum or superatmospheric pressure, or in a special atmosphere, e.g. of inert gas under vacuum
- B65D81/2038—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents providing specific environment for contents, e.g. temperature above or below ambient under vacuum or superatmospheric pressure, or in a special atmosphere, e.g. of inert gas under vacuum with means for establishing or improving vacuum
Definitions
- This invention relates to a vacuum generating device for perishable products such as food, and is an improvement for the applicant's U.S. patent application Ser. No. 10/917,016.
- the present invention is to provide a new vacuum storage device to simplify the process of sealing food and other spoilable products and to solve the problems with the vacuum storage devices described above.
- the invention provides a vacuum sealing device having a lid for a dish or container adapted to receive the perishable product.
- the lid comprises a rigid rim having a lower opening for receiving the dish, an impermeable elastic membrane whose peripheral section is connected or affixed to the rigid rim for sealing to the rim of the dish, and a valve-less air evacuator formed between the elastic membrane and the rim of the dish.
- the rigid rim is made from a sufficiently rigid material to prevent it from being deformed when the lid on the dish is being pressed.
- the valve-less air evacuator allows the air to flow out of the dish when the lid is being pressed and becomes closed when the lid is released to cause said lid to rebound and the space between said lid and container to expand to form a vacuum in the dish.
- the device has a valve-less vacuum releaser comprising a finger-receiving chamber and a section of the elastic membrane located above the finger-receiving chamber and connected to the rigid rim for releasing the vacuum in the dish.
- the finger-receiving chamber is sufficiently large to allow a finger or finger-like member to pass through and push said elastic seal member to release the vacuum in the dish.
- the elastic membrane is sufficiently thinned prior to being affixed to the rigid rim.
- the elastic membrane may be replaced by a rigid or semi-rigid center section and an elastic seal member between the center section and the outer periphery of the rigid rim.
- the present invention further provides a method for using the vacuum generating device by placing said lid on the dish containing a perishable product, forcing air out of the dish via an air evacuator formed between a section of the elastic membrane and the rim of the dish by pressing the lid, and releasing the lid to allow the space between said lid and dish to expand to form a vacuum therein.
- the method may further comprise releasing the vacuum by placing a finger into the finger-receiving chamber of the valve-less vacuum releaser and pushing the elastic membrane and restoring the lid's capability to generate and maintain vacuum in the dish after the lid is used one or more times by exposing the lid to a hot fluid having a temperature higher than 45° C. for a period of time.
- FIG. 1 is a section view of a vacuum generating device having a vacuum lid on a dish before the vacuum is formed;
- FIG. 1 a is a section view for the upper part of the device along line A-A of FIG. 1 ;
- FIG. 1 b is a section view of the device along line B-B of FIG. 1 ;
- FIG. 1 c is a section view of the device of FIG. 1 when the lid is being pressed by a hand or finger;
- FIG. 1 d is a section view of the device of FIG. 1 c after releasing the lid;
- FIG. 2 is a section view of a first modified version for the device of FIG. 1 ;
- FIG. 2 a is a section view for the upper part of the device along line A-A of FIG. 2 ;
- FIG. 2 b is a section view of the upper part of the device of FIG. 2 when the lid tilts naturally on the dish;
- FIG. 3 is a section view of a device having a vacuum lid on a dish before the vacuum is formed according to a second embodiment of the invention
- FIG. 3 a is a section view of the upper part of the device of FIG. 3 when the lid is being pressed by a hand or finger;
- FIG. 3 b is a section view of the device of FIG. 3 a after releasing the lid;
- FIG. 4 is a section view of a first modified version for the device of FIG. 3 , showing the modified vacuum lid and the upper part of the dish before the vacuum is formed;
- FIG. 5 is a section view of a second modified version for the device of FIG. 3 ;
- FIG. 5 a is a section view for the upper part of the device along line A-A of FIG. 5 ;
- FIG. 5 b is a section view of the upper part of the device of FIG. 5 when the lid tilts naturally on the dish;
- FIG. 5 c is a section view of the device of FIG. 5 after the lid is pressed by a hand or finger and released;
- FIG. 6 is a section view of a device having a vacuum lid on a dish before the vacuum is formed according to a third embodiment of the invention.
- FIG. 6 a is a section view of the device along line A-A of FIG. 6 ;
- FIG. 6 b is a section view of the upper part of the device of FIG. 6 when the lid is being pressed by a hand or finger;
- FIG. 6 c is a section view of the device of FIG. 6 b after releasing the lid;
- FIG. 7 is a section view of a device having a vacuum lid above a dish before a vacuum is formed according to a forth embodiment of the invention.
- FIG. 7 a is a section view of the device along line A-A of FIG. 7 ;
- FIG. 7 b is a section view of the device along line B-B of FIG. 7 ;
- FIG. 7 c is a section view of the device of FIG. 7 after the lid is pressed by a hand or finger and released;
- FIG. 8 is a section view of a device having a vacuum lid on a dish before a vacuum is formed according to a fifth embodiment of the invention.
- FIG. 8 a is a section view of the device along line A-A of FIG. 8 without showing the food in the dish;
- FIG. 8 b is a section of the device of FIG. 8 when the lid is being pressed by a hand or finger;
- FIG. 8 c is a section view of the device of FIG. 8 b after releasing the lid;
- FIG. 9 is a section view of the outer rigid rim, inner rim and the membrane of the lid of FIG. 8 before affixed between the upper and lower rigid rims;
- FIG. 9 a is a section view of the outer rigid rim, inner rim and the membrane that is being thinned about 30% to prevent loss of vacuum;
- FIG. 9 b is a section view of the upper rigid rim, inner rim and the thinned membrane after the thinned membrane is affixed between the outer and inner rims;
- FIGS. 1-1 b show a vacuum generating device 1 having a vacuum lid 7 and a dish 2 .
- the dish has a side wall 6 , rim 21 , bottom 4 and chamber 3 for receiving food 5 .
- Lid 7 has an elastic and air impermeable membrane 18 having an outer seal section 28 , a rigid rim 24 for adding strength to the elastic membrane 18 and enabling the membrane to generate vacuum in dish 2 , and a valve-less air evacuator 16 formed between the seal section 28 and the rim 21 of dish 2 for releasing the air in the dish when the lid is being pressed and for causing the seal section 28 to seal to the rim 21 to prevent air from entering the dish when the lid is released.
- the rigid rim 24 comprises an outer rim 9 having a continuous channel 8 around its peripheral and an inner rim 10 having an upper ridge 11 receivable in channel 8 for sandwiching and affixing the periphery of the seal section 28 between the inner and outer rims.
- the outer rim 9 further has an upper horizontal ring 20 , an upper opening 19 to allow access to the elastic membrane 28 , and a bottom-facing inner perimeter 14 .
- the inner rim further has a lower opening 22 to receive or surround the side wall 6 or rim 21 of the dish and a top-facing inner perimeter 15 that fits to the bottom-facing inner perimeter 14 of the outer rim to cause the outer seal section 28 to conform to the contour or topography of the bottom-facing inner perimeter 14 and top-facing inner perimeter 15 .
- the outer rim 9 comprises a rigid material such as metal, glass, ceramics or hard plastics (e.g. polycarbonate, polyester, polyacrylate, polystyrene, polypropylene or polyamide) to lend strength to the elastic membrane 18 and to prevent the rigid rim 24 from deforming when the elastic membrane is pressed downward to the dish 2 .
- a rigid material such as metal, glass, ceramics or hard plastics (e.g. polycarbonate, polyester, polyacrylate, polystyrene, polypropylene or polyamide) to lend strength to the elastic membrane 18 and to prevent the rigid rim 24 from deforming when the elastic membrane is pressed downward to the dish 2 .
- the valve-less air evacuator 16 comprises a recessed section 14 a on the bottom-facing inner perimeter 14 of the outer rim 9 and a protruded section 15 a on the bottom-facing inner perimeter 15 of the inner rim 10 receivable in the recessed section 14 a to form a recessed section 17 on the seal section 28 of the lid.
- the recessed section 17 originates from the recessed section 14 a and protruded section 15 a of the rigid rim 24 and extends a distance L into the seal section 28 of the elastic membrane 18 to form an opening 27 between the recessed section 17 and the rim 21 of the dish 2 .
- the opening 27 stays partially open when the lid or elastic membrane is pressed downward by a finger or hand 25 ( FIG. 1 c ) to allow air to flow out of the dish.
- the lid or elastic membrane tends to rebound, thus causing the space between the lid and dish to expand and a vacuum to form in the dish.
- the valve-less air evacuator is self closed to enable sufficient closing of the opening 27 to preserve the vacuum in the dish for an extended period of time ( FIG. 1 d ).
- the ratio of the length (w) of the recessed section 14 a or protruded section 15 a along the inner perimeter of the rigid rim 24 to the height (h) of the recessed section 14 a or protruded section 15 a must be larger than 1.
- the w/h ratio is larger than 5.
- h is 1 mm
- w must be longer than 1 mm, preferably longer than 5 mm.
- a valve-less air evacuator with a w/h ratio smaller than 1 was found to cause the loss of the vacuum in dish 2 within days or even hours.
- the thickness of the elastic membrane near the recessed section 17 should be less than about 0.05 inches, preferably less than 0.02 inches.
- the elastic membrane 18 may be made from materials such as butyl rubber, nitrile rubber, ethylene acrylic elastomers, ethylene propylene (or EPDM) rubber, natural rubber, polyurethane elastomers, styrene-containing block copolymer elastomers, Santoprene elastomer and polychroroprene elastomer.
- valve-less air evacuator 16 When using vacuum device 1 , one puts the perishable product 5 into the dish 2 , places the lid 7 onto the dish ( FIG. 1 ), and presses the lid or elastic membrane 18 by hand or finger 25 to evacuate the dish ( FIG. 1 c ) through the valve-less air evacuator 16 . Although the valve-less air evacuator is reduced in size by the pressing of the lid, it is still sufficiently large for air to flow out ( FIGS. 1 and 1 c ). By making the w/h ratio larger than 1 and preferably larger than 4, the valve-less evacuator is able to close right after releasing the lid.
- the elasticity of the elastic membrane tends to cause the lid 7 to move upwards to expand the space between the lid and the dish, thus causing a vacuum to form therein.
- the closing of the openings 27 a and 2 b was found to be sufficient to preserve the vacuum up to weeks and even months.
- the dish may be any container such as a bowl, platter, canister, can, drum, barrel, box, beaker, bottle or pot.
- the perishable product may be any product whose composition or physical property may be altered by air or the pollutant or particles in air. Such products include dry or wet foods, samples for analysis, chemicals, medicine, mechanical or electronic devices.
- the device 1 of FIG. 1 enables a consumer to produce a vacuum seal by simply pressing the elastic membrane 18 , it not only saves consumers the money to buy expensive vacuum seal appliances but also make the vacuum sealing of food significantly faster and simpler. More importantly, since device 1 evacuates air via valve-less air evacuator 16 between the elastic membrane 18 and the rim 21 of the dish, it does not need any valves for extracting or removing air from the dish as taught in prior art vacuum devices by Saleri et al. in U.S. Pat. No. 4,051,971, Romero et al. in U.S. Pat. No. 5,871,120, Breen in U.S. Pat. No. 6,148,875, Glaser in U.S. Pat. No.
- Such air extraction or removal valves in the prior art vacuum devices comprise a valve opening and a movable valve member that are susceptible to clogging by the solids in food and soup and to insufficient closing of the valve opening by the movable valve member.
- the valve-less air evacuator which replaces the air extraction valve in the prior art, has no valve opening or movable valve member and is directly formed on the rim of the dish 2 . As a result, the valve-less air evacuator is cleaned every time when the dish is washed, and is thus much less susceptible to clogging or to insufficient closing than the prior art vacuum devices.
- the food in the present device 1 can only contact the lower surface of the elastic membrane 18 , which is easy to clean.
- the difficult-to-clean areas in the prior art devices may allow harmful bacteria to grow and contaminate the food stored therein. Therefore, the present vacuum device 1 provides much more hygienic alternative to the prior art vacuum seal devices.
- a heat activated venting valve (not shown) was initially attached to the elastic membrane 18 of the lid of FIG. 1 .
- the venting valve has a valve opening in communication with a punched opening (not shown) on the elastic membrane and a bi-metal plate that normally seals the valve opening.
- a punched opening (not shown) on the elastic membrane
- a bi-metal plate that normally seals the valve opening.
- the valve-less air evacuator 16 comprises a first protruded section 14 a on the bottom-facing inner perimeter 14 of the outer rim 9 and a first recessed section 15 a on the top-facing inner perimeter 15 of the inner rim 10 receivable in the first protruded section 14 a to form a first protruded section 17 a on the elastic membrane 18 and a second protruded section 14 b on the bottom-facing inner perimeter 14 and a second recessed section 15 a on the top-facing inner perimeter 15 receivable in the second protruded section 14 a to form a second protruded section 17 a on the elastic membrane ( FIGS.
- the protruded sections 17 a and 17 b originate from the protruded sections 14 a and 14 b of the rigid rim 24 , respectively and extends a distance L into the seal section 28 of the elastic membrane 18 to form openings 27 a and 27 b between the rim 21 of the dish 2 and the part of the seal section 28 that is lifted up by the two protruded sections 17 a and 17 b. Since the first and second protruded sections 17 a and 17 b on the seal section 28 of the elastic membrane are located at the left side of the lid, the lid tends to tilt naturally when placed on the dish 2 ( FIG. 2 b ).
- the tilting of the lid 7 might be reversed to make the opening 27 a taller and the opening 27 b shorter.
- Such reversed tilting was discovered to be even more effective in preventing the elastic membrane 18 from being sucked in and the food 5 from being crushed. It was also found that it is possible to enable the lid 7 to tilt on the dish when there is only one protruded section 17 a or 17 b formed on the elastic membrane as long as the protruded section 17 a is sufficiently large, e.g. larger than 20% of the area of the elastic membrane 18 .
- the microwave sucking-in of the elastic membrane 18 and the crushing of the food 5 might be prevented without tilting the lid 7 if the height h for the recessed section 14 a in the device 1 of FIG. 1 is larger than 0.5 mm, preferably larger than 1 mm.
- the tilting of the lid 7 was found to be several times more effective against the microwave induced sucking-in and crushed food problems than a deeper or taller recession 14 a After all, the recession 14 a can not be too deep or tall to make the valve-less air evacuator 16 difficult to close. It was the noticed that when the height h of the recessed section 14 a became larger than 5 to 10 mm the valve-less evacuator became much less capable, if not incapable, to close to preserve the vacuum formed by the lid 7 in the dish.
- the dish 2 used in the device 1 of FIG. 1 or 2 is substantially smaller than the lid 7 , it was found that to enable the lid to tilt ( FIG. 2 b ) or make the recessed section 14 a ( FIG. 1 ) taller than 0.5 mm is not sufficient to resolve the microwave induced suck-in and crushed food problems.
- the length w of the protruded or recessed section 14 a should be about 1/32, preferably 1 ⁇ 8, of the perimeter of the lid 7 .
- FIGS. 3 , 3 a and 3 b provide a second improved version of the lid 7 of FIG. 1 that has a sufficiently rigid center section 79 to prevent the sucking-in and crashed food problems after microwave oven heating.
- the elastic membrane 18 adopts a ring shape.
- the inner and outer peripheries of the ring-shaped elastic membrane are attached to the inner rim 10 and outer rim 9 , respectively, to form a ring-shaped seal section 28 below the chamber 31 between the inner and outer rims.
- the valve-less air evacuator 16 comprises a portion 81 of the ring-shaped seal section 28 .
- the elastic membrane in the portion 81 is thinner or easier to stretch, i.e. more stretchable, than the elastic membrane in the rest of the ring-shaped seal section 28 .
- a vacuum facilitating opening 29 is formed on the outer rim 9 for venting the chamber 31 to facilitating the formation of vacuum in the dish 2 .
- the valve-less air evacuator 16 is closed and there is no gap between the portion 81 of the seal section 28 and the rim 21 of the dish ( FIG. 3 ).
- the seal section 28 is pushed into the chamber 31 and the air pressure in the dish pushes the thinner or weaker elastic membrane at the portion 81 away from the rim 21 of the dish to form the opening 27 to allow air to flow out of the dish ( FIG. 3 a ).
- the opening 29 lets air out of the chamber 31 to prevent any air pressure to form above the elastic membrane 18 .
- FIG. 4 provides a first modified version to the lid 7 of FIG. 3 that has a sufficiently rigid center section 79 to prevent the microwave induced sucking-in and crashed food problems after microwave oven heating.
- the elastic membrane is replaced by a U-shaped seal gasket 32 received in the annular chamber 31 .
- the seal gasket comprises an annular bottom seal section 28 , an annular empty chamber 82 , and a valve-less air evacuator 16 having an easy-to-compress neck section 34 .
- An opening 35 is formed on the side wall of the gasket 32 in communication with the vacuum facilitating opening 29 to facilitate the compression of the seal gasket.
- the neck section 34 allows an opening 27 (not shown) to form between the rim 21 of dish 2 and the part of the seal section 28 located below neck section to allow air in the dish to exit. Since the center section 79 of the lid is sufficiently rigid, this improved lid 7 is also not susceptible to the microwave induced sucking-in and crushed food problems.
- FIGS. 5-5 c provide a second modified version to the lid 7 of FIG. 3 that has a sufficiently rigid center section 79 to prevent the sucking-in and crashed food problems after microwave oven heating.
- the elastic membrane 18 is also replaced by a U-shaped seal gasket 32 received in the annular chamber 31 .
- the seal gasket comprises an annular bottom seal section 28 , an annular empty chamber 82 , a opening 35 in communication with the vacuum facilitating opening 29 , and a valve-less air evacuator 16 comprising two protruded sections 77 , each having a length w and a height h, on the seal section 28 .
- the two protruded sections 77 sits on the rim 21 of the dish and causes two openings 27 a and 27 b to form between the seal section 28 and the rim 21 ( FIGS. 5 and 5 a ).
- the two protruded sections 77 are off centered and located near the right side of the lid, causing the lid to tilt naturally towards the left side on the dish 2 ( FIG. 5 b ). It was found that such tilting of the lid on the dish prevents the damage of the lid and the breakage or deformation of the dish after the dish containing wet food is heated in microwave oven.
- the openings 27 a and 27 b become smaller but still remains sufficiently large (not shown) to allow air to flow out of the dish.
- the air in the annular chamber 82 is also pressed out through the opening 35 , the vacuum facilitating opening 29 and the openings 27 a and 27 b.
- the openings 27 a and 27 b are able to close right after releasing the lid.
- the elasticity of the gasket 3 tends to push the lid 7 upwards to expand the space between the lid and the dish, thus causing a vacuum to form therein.
- the closing of the openings 27 a and 2 b was found to be sufficient to preserve the vacuum up to several days and even weeks. Since the center section 79 of the lid is sufficiently rigid, this improved lid 7 is not susceptible to the microwave induced sucking-in and crushed food problems.
- FIG. 1 Another of the problems discovered with the present invention of the vacuum device 1 in FIG. 1 is that the lid 7 is difficult to be removed from the dish 2 , especially when most of the air in the dish is removed or expelled. Such difficult-to-remove lid problem was found to be inconvenient to the users. It was also found to cause spill and mess when one tries very hard to remove the lid from a dish that contains soup or other liquid. In case of hot soup, the spill might reach a user's hand and cause potential burning or hurting.
- FIGS. 6 , 6 a, 6 b and 6 c describe a valve-less vacuum releaser 43 for the device 1 to resolving this problem.
- the releaser 43 comprises a curved-out section 94 on the rigid rim 24 , a section of elastic membrane 48 affixed to the curved-out section, and a finger receiving chamber 47 defined by the curved-out section below the section of elastic membrane 48 .
- the finger receiving chamber 47 is large enough to receive a finger or a finger-like member 41 ( FIG. 6 c ) to enable the finger to push the elastic membrane upward to generate an air passage for releasing the vacuum.
- the vacuum release by the finger 41 makes the removal of the lid 7 from the dish spill-free and much less difficult.
- the valve-less vacuum releaser further has a squeeze enabler 42 formed above the section of elastic membrane 48 .
- the squeeze enabler allows one to place one finger above the enabler and another finger of the same hand below the elastic membrane to squeeze the membrane to release the vacuum in the dish.
- the enabler 42 can be a thin plate connected to the rigid rim 24 as shown in FIG. 6 or one or more beams (not shown) connected to the rigid rim. It is important the squeeze enabler is positioned sufficiently apart from the section of elastic membrane 48 .
- the distance between the elastic membrane and the enabler should be more than about 2 mm, and is preferably more than 4 mm or 0.16 inches.
- the vacuum relief valves in the vacuum food containers taught by the prior art and products such as the FoodSaver® or Seal-a-Meal® vacuum canisters have a small valve opening and a seal member that seals the valve opening during food storage and is manually moved away from the valve opening to release the vacuum prior to removing the lid. Similar to the air extraction valve used in the prior art products, such vacuum relief valves are susceptible to clogging, insufficient closing and bacteria growth problems.
- the valve-less vacuum releaser 43 has no such valve openings or seal member, and is thus immune to such problems during everyday home uses.
- the lid may be removed by just pushing up the rim or periphery of the lid. It is also appreciated that the valve-less vacuum releaser 43 may used for the lid for the vacuum food canisters and sealed containers.
- valve-less vacuum releaser 43 can also be formed on the vacuum lid 7 of the device 1 described in FIGS. 3 to 5 .
- the curved-out section 94 of the releaser 43 is formed on the out rim 9 of the annular chamber 31 and the ring-shaped or annular seal section 28 is extended into the curved-out section 94 to form an elastic section 48 affixed to the curved-out section 94 (not shown).
- FIGS. 7 , 7 a, 7 b and 7 c describe a first modified version of the valve-less vacuum releaser 43 for the vacuum lid 7 .
- the device 1 has a rectangular dish 2 and a rectangular vacuum lid 7 having a rectangular elastic membrane 18 affixed to the rigid rim 28 of the lid and two valve-less vacuum releasers 43 , one on the left and the other on the right side of the lid.
- the lower opening 22 of the lid 7 is dimensioned to receive the rim 21 and the two handles 49 of the dish 2 .
- Each valve-less vacuum releaser 43 comprises a first finger-receiving chamber 47 b in a handle 49 of the dish 2 , a section of elastic membrane 48 above the first finger-receiving chamber 47 b, a second finger-receiving chamber 47 a below the section of elastic membrane 48 in the lid 7 , and squeeze enabling plate 42 .
- the squeeze plate 42 is located a predetermined distance above the upper horizontal ring 20 formed on the outer rim 9 ( FIGS. 7 and 7 b ).
- the first finger-receiving chamber 47 b has an inner chamber 52 and an outer opening 51 ( FIG. 7 a ) sufficiently large to allow a finger 41 to pass through to reach the second finger-receiving chamber 47 a and the section of elastic membrane 48 to push the elastic membrane to release the vacuum in the dish ( FIG. 7 c ).
- FIGS. 8 , 8 a, 8 b and 8 c describe a second modified version of the valve-less vacuum releaser 43 for a round vacuum lid 7 comprising a round elastic membrane 18 with its peripheral section 28 affixed to the rigid rim 24 similar to that described in FIG. 1 .
- the valve-less vacuum releaser 43 comprises a finger-receiving chamber 47 formed by curving or recessing the side wall 6 of the dish 2 and the section of elastic membrane 48 above the finger receiving chamber ( FIGS. 8 and 8 a ).
- the chamber 47 is sufficiently large to receive a finger or finger-like member 41 to allow the finger to push the section of elastic membrane 48 to release the vacuum in the dish ( FIG. 8 c ).
- the part of the upper horizontal ring 20 located a predetermined distance above the section of elastic membrane 48 could function as the squeeze enabler 43 to facilitate the release of the vacuum in the dish 2 .
- a protruded section 57 is provided on the front part and another protruded section 57 on the back part of the rim 21 of the dish 2 to form openings 27 a on the left and openings 27 b on the right side of the protruded sections 57 .
- Both the front and back protruded sections 57 are positioned near the right part of the dish to cause the lid 7 to tilt towards the left side to make openings 27 b significantly larger than openings 27 a for preventing the microwave induced sucking-in and crushed food problems discussed earlier for the device 1 of FIG. 1 .
- the openings 27 a and 27 b also functions as the valve-less air evacuator 16 that enables air in the dish to be evacuated when a hand or finger 25 presses the elastic membrane 18 of the lid into the dish ( FIG. 8 b ) and enable sufficient closing of the openings 27 a and 27 b after releasing the lid to preserve the vacuum formed in the dish 2 ( FIG. 8 c ).
- FIGS. 9 a - c shows the thinning process for the elastic membrane 18 before affixing it to the rigid rim 24 .
- the elastic membrane 18 was thick and its peripheral edge was clamped by clamp 72 ( FIG. 9 ).
- the elastic membrane was placed between the outer rigid rim 9 and inner rim 10 .
- FIG. 9 b shows the elastic membrane 18 after the membrane was thinned about 25% by stretching the elastic membrane 18 with the clamp 72 .
- FIG. 9 c shows the vacuum lid 7 with the thinned elastic membrane sandwiched between the inner and outer rims 9 an 10 .
- the inner rim 10 is prevented from separating from the outer rim 9 by the annular channel 11 in the outer rim 9 and the ridge 8 on the inner rim 10 , where the thickness of the ridge 8 plus two times of the thickness of the thinned elastic membrane is larger than the gap for annular channel 11 .
- the thinning of the elastic membrane 18 in the vacuum lid should be about 3% or more depending on the nature and original thickness of the elastic membrane, and be preferably more than 8% prior to affixing the membrane to the rigid rim 24 .
- the lid 7 was used to generate and maintain vacuum in the container one or more times, the lid gradually lost its capability to generate and maintain sufficient vacuum for the perishable product. It was further found that the lid's capability to generate and maintain vacuum could be restored, at least partially, by exposing the lid to a hot fluid such as hot water having a temperature higher than 45° C. for about 10 seconds to several minutes. Higher hot fluid temperature up to 95° C. and longer exposing time was found to restore the lid's vacuum generating and maintaining capability in some cases more effectively.
- a hot fluid such as hot water having a temperature higher than 45° C. for about 10 seconds to several minutes. Higher hot fluid temperature up to 95° C. and longer exposing time was found to restore the lid's vacuum generating and maintaining capability in some cases more effectively.
- the rigid rim 24 may have a curved-out or outwardly protruding section shaped to receive the spout and the elastic membrane 48 may also have an outwardly protruding section attached to the outwardly protruding section of the rigid rim to seal the spout. If the spout has a downward or upward slope, the outwardly protruding sections of the rigid rim and membrane may have a similar slope to allow the outwardly protruding membrane section to seal the spout. It is possible to shape curved-out section 94 of the valve-less release valve 43 for sealing the spout.
- the elastic membrane can have various layers as taught in the applicant's U.S. patent application Ser. No. 10/917,016. Particularly, it was discovered that a multi-layer elastic membrane comprising a thin top elastic film layer, a thin bottom elastic film layer and an bonding layer between the thin top and bottom elastic film layers provides significantly improved vacuum seal to the container. By selecting a bonding material such as a soft gel, a viscous liquid or the like that can flow or move within the top and bottom film layers, the membrane forms significantly improved seal to the container.
- a bonding material such as a soft gel, a viscous liquid or the like that can flow or move within the top and bottom film layers
- the thickness of the multi-layer membrane is reduced at or near the contact area between the membrane and the rim of the container as a result of the fluidity of the bonding materials, thus forming an annual slot on the membrane to receive the rim of the container and improving the seal to the container.
- the bonding layer is thicker than the bottom elastic film layer, and is preferably 2 to 50 times as thick as the bottom elastic film.
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Abstract
A vacuum sealing device comprises a lid having a rigid rim with a lower opening for receiving a dish, an impermeable elastic membrane peripherally affixed to the rigid rim for sealing the dish, and a valve-less air evacuator formed between the elastic membrane and the dish rim. The valve-less evacuator allows air to flow out of the dish when the lid is being pressed and becomes closed when the lid is released to cause said lid to rebound to form a vacuum in the dish. The rigid rim prevents lid deformation when the lid is pressed, thus enabling the vacuum formation. To facilitate lid removal, the device has a valve-less vacuum releaser comprising a finger-receiving chamber and a section of the elastic membrane located above the chamber and connected to the rigid rim for releasing the vacuum in the dish. To prevent vacuum loss during storage in freezer or fridge, the elastic membrane is sufficiently thinned prior to being affixed to the rigid rim. In use, one places the lid on a dish, forces air out of the dish via the air evacuator between a section of the elastic membrane and the dish rim by pressing the lid, and releases the lid to cause the air evacuator to close and vacuum to form in the dish. To restore the device's capability to generate and maintain vacuum after numerous uses, the lid is exposed to a hot fluid having a temperature higher than 45° C. for a period of time.
Description
- This is a continuation-in-part patent application of the application Ser. No. 11/499,280, filed Aug. 5, 2006, which is to be issued as U.S. Pat. No. 7,594,586.
- This invention relates to a vacuum generating device for perishable products such as food, and is an improvement for the applicant's U.S. patent application Ser. No. 10/917,016.
- In commercial and home vacuum packaging, food is often placed in a plastic vacuum bag and the bag is subsequently evacuated and sealed by a vacuum seal appliance such as FoodSaver® or Seal-a-Meal® sealer. For average homes, such method is too labor intensive and complex for daily food storage. Moreover, the vacuum bag is normally disposed after one use, which is expensive and not environment friendly.
- It is also known to place food in a vacuum container and evacuate the container either by connecting the vacuum seal appliance to the container lid via a vacuum tube as taught by FoodSaver® or Seal-a-Meal® sealer or by manually removing air via a check valve in the lid as taught by Wang in U.S. Pat. No. 6,557,462. Such vacuum containers are susceptible to air leakage and plugging of the check valve and vacuum release valve in the lid by food. The check valve and vacuum release valve in the lid are also difficult to clean, which is not desirable for food storage.
- In the applicant's earlier invention disclosed in U.S. patent application Ser. No. 10/917,016, it was taught to seal food in existing kitchen containers with a vacuum lid comprising a rigid ring and an elastic membrane attached to the rigid ring.
- The present invention is to provide a new vacuum storage device to simplify the process of sealing food and other spoilable products and to solve the problems with the vacuum storage devices described above.
- The invention provides a vacuum sealing device having a lid for a dish or container adapted to receive the perishable product. The lid comprises a rigid rim having a lower opening for receiving the dish, an impermeable elastic membrane whose peripheral section is connected or affixed to the rigid rim for sealing to the rim of the dish, and a valve-less air evacuator formed between the elastic membrane and the rim of the dish. The rigid rim is made from a sufficiently rigid material to prevent it from being deformed when the lid on the dish is being pressed. The valve-less air evacuator allows the air to flow out of the dish when the lid is being pressed and becomes closed when the lid is released to cause said lid to rebound and the space between said lid and container to expand to form a vacuum in the dish. To facilitate the removal of the lid, the device has a valve-less vacuum releaser comprising a finger-receiving chamber and a section of the elastic membrane located above the finger-receiving chamber and connected to the rigid rim for releasing the vacuum in the dish. The finger-receiving chamber is sufficiently large to allow a finger or finger-like member to pass through and push said elastic seal member to release the vacuum in the dish.
- To prevent the sucking-in of the elastic membrane after microwave oven heating and prevent potential crushing of the perishable product in the dish or damaging of the elastic membrane during said sucking-in, at least one protruded section is provided on the elastic membrane or the rim of the dish to cause the lid to tilt sufficiently on the dish. To prevent the loss of vacuum in the dish during the storage of the perishable product in freezers and refrigerators, the elastic membrane is sufficiently thinned prior to being affixed to the rigid rim. In another embodiment of the invention, the elastic membrane may be replaced by a rigid or semi-rigid center section and an elastic seal member between the center section and the outer periphery of the rigid rim.
- The present invention further provides a method for using the vacuum generating device by placing said lid on the dish containing a perishable product, forcing air out of the dish via an air evacuator formed between a section of the elastic membrane and the rim of the dish by pressing the lid, and releasing the lid to allow the space between said lid and dish to expand to form a vacuum therein. The method may further comprise releasing the vacuum by placing a finger into the finger-receiving chamber of the valve-less vacuum releaser and pushing the elastic membrane and restoring the lid's capability to generate and maintain vacuum in the dish after the lid is used one or more times by exposing the lid to a hot fluid having a temperature higher than 45° C. for a period of time.
- The accompanying drawing illustrates diagrammatically non-limitative embodiment of the invention, as follows:
-
FIG. 1 is a section view of a vacuum generating device having a vacuum lid on a dish before the vacuum is formed; -
FIG. 1 a is a section view for the upper part of the device along line A-A ofFIG. 1 ; -
FIG. 1 b is a section view of the device along line B-B ofFIG. 1 ; -
FIG. 1 c is a section view of the device ofFIG. 1 when the lid is being pressed by a hand or finger; -
FIG. 1 d is a section view of the device ofFIG. 1 c after releasing the lid; -
FIG. 2 is a section view of a first modified version for the device ofFIG. 1 ; -
FIG. 2 a is a section view for the upper part of the device along line A-A ofFIG. 2 ; -
FIG. 2 b is a section view of the upper part of the device ofFIG. 2 when the lid tilts naturally on the dish; -
FIG. 3 is a section view of a device having a vacuum lid on a dish before the vacuum is formed according to a second embodiment of the invention; -
FIG. 3 a is a section view of the upper part of the device ofFIG. 3 when the lid is being pressed by a hand or finger; -
FIG. 3 b is a section view of the device ofFIG. 3 a after releasing the lid; -
FIG. 4 is a section view of a first modified version for the device ofFIG. 3 , showing the modified vacuum lid and the upper part of the dish before the vacuum is formed; -
FIG. 5 is a section view of a second modified version for the device ofFIG. 3 ; -
FIG. 5 a is a section view for the upper part of the device along line A-A ofFIG. 5 ; -
FIG. 5 b is a section view of the upper part of the device ofFIG. 5 when the lid tilts naturally on the dish; -
FIG. 5 c is a section view of the device ofFIG. 5 after the lid is pressed by a hand or finger and released; -
FIG. 6 is a section view of a device having a vacuum lid on a dish before the vacuum is formed according to a third embodiment of the invention; -
FIG. 6 a is a section view of the device along line A-A ofFIG. 6 ; -
FIG. 6 b is a section view of the upper part of the device ofFIG. 6 when the lid is being pressed by a hand or finger; -
FIG. 6 c is a section view of the device ofFIG. 6 b after releasing the lid; -
FIG. 7 is a section view of a device having a vacuum lid above a dish before a vacuum is formed according to a forth embodiment of the invention; -
FIG. 7 a is a section view of the device along line A-A ofFIG. 7 ; -
FIG. 7 b is a section view of the device along line B-B ofFIG. 7 ; -
FIG. 7 c is a section view of the device ofFIG. 7 after the lid is pressed by a hand or finger and released; -
FIG. 8 is a section view of a device having a vacuum lid on a dish before a vacuum is formed according to a fifth embodiment of the invention; -
FIG. 8 a is a section view of the device along line A-A ofFIG. 8 without showing the food in the dish; -
FIG. 8 b is a section of the device ofFIG. 8 when the lid is being pressed by a hand or finger; -
FIG. 8 c is a section view of the device ofFIG. 8 b after releasing the lid; -
FIG. 9 is a section view of the outer rigid rim, inner rim and the membrane of the lid ofFIG. 8 before affixed between the upper and lower rigid rims; -
FIG. 9 a is a section view of the outer rigid rim, inner rim and the membrane that is being thinned about 30% to prevent loss of vacuum; -
FIG. 9 b is a section view of the upper rigid rim, inner rim and the thinned membrane after the thinned membrane is affixed between the outer and inner rims; -
FIGS. 1-1 b show avacuum generating device 1 having avacuum lid 7 and adish 2. The dish has aside wall 6,rim 21,bottom 4 andchamber 3 for receivingfood 5.Lid 7 has an elastic and airimpermeable membrane 18 having anouter seal section 28, arigid rim 24 for adding strength to theelastic membrane 18 and enabling the membrane to generate vacuum indish 2, and avalve-less air evacuator 16 formed between theseal section 28 and therim 21 ofdish 2 for releasing the air in the dish when the lid is being pressed and for causing theseal section 28 to seal to therim 21 to prevent air from entering the dish when the lid is released. - The
rigid rim 24 comprises anouter rim 9 having acontinuous channel 8 around its peripheral and aninner rim 10 having anupper ridge 11 receivable inchannel 8 for sandwiching and affixing the periphery of theseal section 28 between the inner and outer rims. Theouter rim 9 further has an upperhorizontal ring 20, anupper opening 19 to allow access to theelastic membrane 28, and a bottom-facinginner perimeter 14. The inner rim further has alower opening 22 to receive or surround theside wall 6 or rim 21 of the dish and a top-facinginner perimeter 15 that fits to the bottom-facinginner perimeter 14 of the outer rim to cause theouter seal section 28 to conform to the contour or topography of the bottom-facinginner perimeter 14 and top-facinginner perimeter 15. Theouter rim 9 comprises a rigid material such as metal, glass, ceramics or hard plastics (e.g. polycarbonate, polyester, polyacrylate, polystyrene, polypropylene or polyamide) to lend strength to theelastic membrane 18 and to prevent therigid rim 24 from deforming when the elastic membrane is pressed downward to thedish 2. - As shown in
FIGS. 1 , 1 a and 1 b, thevalve-less air evacuator 16 comprises a recessedsection 14 a on the bottom-facinginner perimeter 14 of theouter rim 9 and a protrudedsection 15 a on the bottom-facinginner perimeter 15 of theinner rim 10 receivable in the recessedsection 14 a to form a recessedsection 17 on theseal section 28 of the lid. The recessedsection 17 originates from the recessedsection 14 a and protrudedsection 15 a of therigid rim 24 and extends a distance L into theseal section 28 of theelastic membrane 18 to form anopening 27 between the recessedsection 17 and therim 21 of thedish 2. Theopening 27 stays partially open when the lid or elastic membrane is pressed downward by a finger or hand 25 (FIG. 1 c) to allow air to flow out of the dish. Upon release, the lid or elastic membrane tends to rebound, thus causing the space between the lid and dish to expand and a vacuum to form in the dish. The valve-less air evacuator is self closed to enable sufficient closing of theopening 27 to preserve the vacuum in the dish for an extended period of time (FIG. 1 d). - To enable the sufficient closure of the
valve-less air evacuator 16 after the release of the lid or elastic membrane, it was found that the ratio of the length (w) of the recessedsection 14 a or protrudedsection 15 a along the inner perimeter of therigid rim 24 to the height (h) of the recessedsection 14 a or protrudedsection 15 a must be larger than 1. Preferably, the w/h ratio is larger than 5. For example, when h is 1 mm, w must be longer than 1 mm, preferably longer than 5 mm. A valve-less air evacuator with a w/h ratio smaller than 1 was found to cause the loss of the vacuum indish 2 within days or even hours. It was also found that the thickness of the elastic membrane near the recessedsection 17 should be less than about 0.05 inches, preferably less than 0.02 inches. - To allow the valve-less air evacuator to function, the maximum thickness allowed for the
elastic membrane 18 was found to be 0.25 w or smaller. Long preservation (e.g. three to thirty weeks) of the vacuum in thedish 2 was found to be achieved when theelastic membrane 18 in the vacuum lid was thinner than about 0.01 inches. Theelastic membrane 18 may be made from materials such as butyl rubber, nitrile rubber, ethylene acrylic elastomers, ethylene propylene (or EPDM) rubber, natural rubber, polyurethane elastomers, styrene-containing block copolymer elastomers, Santoprene elastomer and polychroroprene elastomer. - When using
vacuum device 1, one puts theperishable product 5 into thedish 2, places thelid 7 onto the dish (FIG. 1 ), and presses the lid orelastic membrane 18 by hand orfinger 25 to evacuate the dish (FIG. 1 c) through thevalve-less air evacuator 16. Although the valve-less air evacuator is reduced in size by the pressing of the lid, it is still sufficiently large for air to flow out (FIGS. 1 and 1 c). By making the w/h ratio larger than 1 and preferably larger than 4, the valve-less evacuator is able to close right after releasing the lid. After the lid is released or not pressed, the elasticity of the elastic membrane tends to cause thelid 7 to move upwards to expand the space between the lid and the dish, thus causing a vacuum to form therein. The closing of theopenings 27 a and 2 b was found to be sufficient to preserve the vacuum up to weeks and even months. - It is appreciated that without the
valve-less evacuator 16, it would be difficult for air to flow out when thelid 7 is pressed and as result thedish 7 would have either very low vacuum or even no vacuum generated therein. The dish may be any container such as a bowl, platter, canister, can, drum, barrel, box, beaker, bottle or pot. The perishable product may be any product whose composition or physical property may be altered by air or the pollutant or particles in air. Such products include dry or wet foods, samples for analysis, chemicals, medicine, mechanical or electronic devices. - Because the
device 1 ofFIG. 1 enables a consumer to produce a vacuum seal by simply pressing theelastic membrane 18, it not only saves consumers the money to buy expensive vacuum seal appliances but also make the vacuum sealing of food significantly faster and simpler. More importantly, sincedevice 1 evacuates air viavalve-less air evacuator 16 between theelastic membrane 18 and therim 21 of the dish, it does not need any valves for extracting or removing air from the dish as taught in prior art vacuum devices by Saleri et al. in U.S. Pat. No. 4,051,971, Romero et al. in U.S. Pat. No. 5,871,120, Breen in U.S. Pat. No. 6,148,875, Glaser in U.S. Pat. No. 6,194,011 and Wang in U.S. Pat. No. 6,557,462. Such air extraction or removal valves in the prior art vacuum devices comprise a valve opening and a movable valve member that are susceptible to clogging by the solids in food and soup and to insufficient closing of the valve opening by the movable valve member. The valve-less air evacuator, which replaces the air extraction valve in the prior art, has no valve opening or movable valve member and is directly formed on the rim of thedish 2. As a result, the valve-less air evacuator is cleaned every time when the dish is washed, and is thus much less susceptible to clogging or to insufficient closing than the prior art vacuum devices. - Moreover, unlike the prior art devices that contain difficult-to-clean areas such as those in the valve openings or between the valve opening base and valve member, the food in the
present device 1 can only contact the lower surface of theelastic membrane 18, which is easy to clean. The difficult-to-clean areas in the prior art devices may allow harmful bacteria to grow and contaminate the food stored therein. Therefore, thepresent vacuum device 1 provides much more hygienic alternative to the prior art vacuum seal devices. - One of the problems discovered with the present invention of the vacuum device in
FIG. 1 is that after heating the device containing food in microwave oven, theelastic membrane 18 of thelid 7 is sometimes completely sucked into thedish 2 and crashed the food therein. In case that the food contains sharp bones or shells, the elastic membrane was found to be weakened or even punctured by the food. The complete sucking-in of the elastic membrane also made it very difficult to remove the lid from thedish 2 after the microwave heating. Such microwave induced sucking-in and crushed food problems were found to occur when thelid 7 was not promptly removed from the dish after the microwave oven heating. - To resolve the microwave induced sucking-in and crushed food problems, a heat activated venting valve (not shown) was initially attached to the
elastic membrane 18 of the lid ofFIG. 1 . The venting valve has a valve opening in communication with a punched opening (not shown) on the elastic membrane and a bi-metal plate that normally seals the valve opening. When the food in thedevice 1 was heated up, the bi-metal plate deformed and opens up the valve opening to vent the dish. The bi-metal plate remained in the deformed state to vent the dish after microwave heating, thus preventing the elastic membrane from being sucked into the dish and from crashing the food. Unfortunately, the venting valve was frequently found to be clogged or to cause loss of vacuum due to leakage when the food contains soup or liquid. - An improved version for the
lid 7 ofFIG. 1 is provided (FIGS. 2 , 2 a and 2 b) to resolve the microwave induced sucking-in and crushed food problems. In theimproved lid 7, thevalve-less air evacuator 16 comprises a first protrudedsection 14 a on the bottom-facinginner perimeter 14 of theouter rim 9 and a first recessedsection 15 a on the top-facinginner perimeter 15 of theinner rim 10 receivable in the first protrudedsection 14 a to form a first protrudedsection 17 a on theelastic membrane 18 and a second protruded section 14 b on the bottom-facinginner perimeter 14 and a second recessedsection 15 a on the top-facinginner perimeter 15 receivable in the second protrudedsection 14 a to form a second protrudedsection 17 a on the elastic membrane (FIGS. 2 and 2 a). The protrudedsections sections 14 a and 14 b of therigid rim 24, respectively and extends a distance L into theseal section 28 of theelastic membrane 18 to formopenings rim 21 of thedish 2 and the part of theseal section 28 that is lifted up by the two protrudedsections sections seal section 28 of the elastic membrane are located at the left side of the lid, the lid tends to tilt naturally when placed on the dish 2 (FIG. 2 b). It was found that such tilting of the lid on the dish prevented the elastic membrane from being sucked into the dish and the food from being crashed after microwave oven heating. It is believed that the tilting of thelid 7 on the dish made theopening 27 b tall enough to prevent the elastic membrane from being sucked into the dish after microwave oven heating. - By adding more mass to the right side of the
rigid rim 24, the tilting of thelid 7 might be reversed to make theopening 27 a taller and theopening 27 b shorter. Such reversed tilting was discovered to be even more effective in preventing theelastic membrane 18 from being sucked in and thefood 5 from being crushed. It was also found that it is possible to enable thelid 7 to tilt on the dish when there is only one protrudedsection section 17 a is sufficiently large, e.g. larger than 20% of the area of theelastic membrane 18. It was further discovered that the microwave sucking-in of theelastic membrane 18 and the crushing of thefood 5 might be prevented without tilting thelid 7 if the height h for the recessedsection 14 a in thedevice 1 ofFIG. 1 is larger than 0.5 mm, preferably larger than 1 mm. However, the tilting of thelid 7 was found to be several times more effective against the microwave induced sucking-in and crushed food problems than a deeper ortaller recession 14 a After all, therecession 14 a can not be too deep or tall to make thevalve-less air evacuator 16 difficult to close. It was the noticed that when the height h of the recessedsection 14 a became larger than 5 to 10 mm the valve-less evacuator became much less capable, if not incapable, to close to preserve the vacuum formed by thelid 7 in the dish. - When the
dish 2 used in thedevice 1 ofFIG. 1 or 2 is substantially smaller than thelid 7, it was found that to enable the lid to tilt (FIG. 2 b) or make the recessedsection 14 a (FIG. 1 ) taller than 0.5 mm is not sufficient to resolve the microwave induced suck-in and crushed food problems. To prevent the sucking-in and crushed food problems when asmaller diameter dish 2 is used, it was found that the length w of the protruded or recessedsection 14 a should be about 1/32, preferably ⅛, of the perimeter of thelid 7. -
FIGS. 3 , 3 a and 3 b provide a second improved version of thelid 7 ofFIG. 1 that has a sufficientlyrigid center section 79 to prevent the sucking-in and crashed food problems after microwave oven heating. Theelastic membrane 18 adopts a ring shape. The inner and outer peripheries of the ring-shaped elastic membrane are attached to theinner rim 10 andouter rim 9, respectively, to form a ring-shapedseal section 28 below thechamber 31 between the inner and outer rims. Thevalve-less air evacuator 16 comprises aportion 81 of the ring-shapedseal section 28. The elastic membrane in theportion 81 is thinner or easier to stretch, i.e. more stretchable, than the elastic membrane in the rest of the ring-shapedseal section 28. Avacuum facilitating opening 29 is formed on theouter rim 9 for venting thechamber 31 to facilitating the formation of vacuum in thedish 2. Before thelid 7 is pressed, thevalve-less air evacuator 16 is closed and there is no gap between theportion 81 of theseal section 28 and therim 21 of the dish (FIG. 3 ). When the lid is pressed by a hand orfinger 25, theseal section 28 is pushed into thechamber 31 and the air pressure in the dish pushes the thinner or weaker elastic membrane at theportion 81 away from therim 21 of the dish to form theopening 27 to allow air to flow out of the dish (FIG. 3 a). Theopening 29 lets air out of thechamber 31 to prevent any air pressure to form above theelastic membrane 18. After the lid is released, theelastic membrane 18 tends to return to its natural position, thus causing the space between the lid and dish to expand to form a vacuum and causing the elastic membrane in theportion 81 to seal to therim 21 of the dish (FIG. 3 b). Besides lowering the thickness or increasing the stretchability of the elastic film on theportion 81 to produce thevalve-less air evacuator 16 when pressing the lid, it was found that providing a recessed or protruded portion on theseal section 28 like that inFIGS. 1 and 2 also produced the valve-less air evacuator. In all cases, sinceelastic membrane 18 is confined by thechamber 31 and thecenter section 79 of the lid is sufficiently rigid, thisimproved lid 7 is not susceptible to the microwave induced sucking-in and crushed food problems. -
FIG. 4 provides a first modified version to thelid 7 ofFIG. 3 that has a sufficientlyrigid center section 79 to prevent the microwave induced sucking-in and crashed food problems after microwave oven heating. In this lid, the elastic membrane is replaced by aU-shaped seal gasket 32 received in theannular chamber 31. The seal gasket comprises an annularbottom seal section 28, an annularempty chamber 82, and avalve-less air evacuator 16 having an easy-to-compress neck section 34. Anopening 35 is formed on the side wall of thegasket 32 in communication with thevacuum facilitating opening 29 to facilitate the compression of the seal gasket. When thelid 7 is pressed, theneck section 34 allows an opening 27 (not shown) to form between therim 21 ofdish 2 and the part of theseal section 28 located below neck section to allow air in the dish to exit. Since thecenter section 79 of the lid is sufficiently rigid, thisimproved lid 7 is also not susceptible to the microwave induced sucking-in and crushed food problems. -
FIGS. 5-5 c provide a second modified version to thelid 7 ofFIG. 3 that has a sufficientlyrigid center section 79 to prevent the sucking-in and crashed food problems after microwave oven heating. In this alternative lid, theelastic membrane 18 is also replaced by aU-shaped seal gasket 32 received in theannular chamber 31. The seal gasket comprises an annularbottom seal section 28, an annularempty chamber 82, aopening 35 in communication with thevacuum facilitating opening 29, and avalve-less air evacuator 16 comprising two protrudedsections 77, each having a length w and a height h, on theseal section 28. The two protrudedsections 77 sits on therim 21 of the dish and causes twoopenings seal section 28 and the rim 21 (FIGS. 5 and 5 a). The two protrudedsections 77 are off centered and located near the right side of the lid, causing the lid to tilt naturally towards the left side on the dish 2 (FIG. 5 b). It was found that such tilting of the lid on the dish prevents the damage of the lid and the breakage or deformation of the dish after the dish containing wet food is heated in microwave oven. - When the
lid 7 is pressed, theopenings annular chamber 82 is also pressed out through theopening 35, thevacuum facilitating opening 29 and theopenings openings gasket 3 tends to push thelid 7 upwards to expand the space between the lid and the dish, thus causing a vacuum to form therein. The closing of theopenings 27 a and 2 b was found to be sufficient to preserve the vacuum up to several days and even weeks. Since thecenter section 79 of the lid is sufficiently rigid, thisimproved lid 7 is not susceptible to the microwave induced sucking-in and crushed food problems. - Another of the problems discovered with the present invention of the
vacuum device 1 inFIG. 1 is that thelid 7 is difficult to be removed from thedish 2, especially when most of the air in the dish is removed or expelled. Such difficult-to-remove lid problem was found to be inconvenient to the users. It was also found to cause spill and mess when one tries very hard to remove the lid from a dish that contains soup or other liquid. In case of hot soup, the spill might reach a user's hand and cause potential burning or hurting.FIGS. 6 , 6 a, 6 b and 6 c describe avalve-less vacuum releaser 43 for thedevice 1 to resolving this problem. Thereleaser 43 comprises a curved-outsection 94 on therigid rim 24, a section ofelastic membrane 48 affixed to the curved-out section, and afinger receiving chamber 47 defined by the curved-out section below the section ofelastic membrane 48. Thefinger receiving chamber 47 is large enough to receive a finger or a finger-like member 41 (FIG. 6 c) to enable the finger to push the elastic membrane upward to generate an air passage for releasing the vacuum. The vacuum release by thefinger 41 makes the removal of thelid 7 from the dish spill-free and much less difficult. - The valve-less vacuum releaser further has a
squeeze enabler 42 formed above the section ofelastic membrane 48. The squeeze enabler allows one to place one finger above the enabler and another finger of the same hand below the elastic membrane to squeeze the membrane to release the vacuum in the dish. Theenabler 42 can be a thin plate connected to therigid rim 24 as shown inFIG. 6 or one or more beams (not shown) connected to the rigid rim. It is important the squeeze enabler is positioned sufficiently apart from the section ofelastic membrane 48. The distance between the elastic membrane and the enabler should be more than about 2 mm, and is preferably more than 4 mm or 0.16 inches. - The vacuum relief valves in the vacuum food containers taught by the prior art and products such as the FoodSaver® or Seal-a-Meal® vacuum canisters have a small valve opening and a seal member that seals the valve opening during food storage and is manually moved away from the valve opening to release the vacuum prior to removing the lid. Similar to the air extraction valve used in the prior art products, such vacuum relief valves are susceptible to clogging, insufficient closing and bacteria growth problems. The
valve-less vacuum releaser 43 has no such valve openings or seal member, and is thus immune to such problems during everyday home uses. It is appreciated that for the very low vacuum that forms in conventional sealed containers when refrigerated or in containers sealed by Amco or Progressive's silicone lids, the lid may be removed by just pushing up the rim or periphery of the lid. It is also appreciated that thevalve-less vacuum releaser 43 may used for the lid for the vacuum food canisters and sealed containers. - During use, it was found that a much deeper vacuum was formed in the dish if the curved-out
section 94 of the releaser is lifted or pushed upward slightly by ahand 44 while theelastic membrane 18 is being pressed into the dish by a hand or finger 25 (FIG. 6 b). It is appreciated that thevalve-less vacuum releaser 43 can also be formed on thevacuum lid 7 of thedevice 1 described inFIGS. 3 to 5 . The curved-outsection 94 of thereleaser 43 is formed on theout rim 9 of theannular chamber 31 and the ring-shaped orannular seal section 28 is extended into the curved-outsection 94 to form anelastic section 48 affixed to the curved-out section 94 (not shown). -
FIGS. 7 , 7 a, 7 b and 7 c describe a first modified version of thevalve-less vacuum releaser 43 for thevacuum lid 7. Thedevice 1 has arectangular dish 2 and arectangular vacuum lid 7 having a rectangularelastic membrane 18 affixed to therigid rim 28 of the lid and twovalve-less vacuum releasers 43, one on the left and the other on the right side of the lid. Thelower opening 22 of thelid 7 is dimensioned to receive therim 21 and the twohandles 49 of thedish 2. Eachvalve-less vacuum releaser 43 comprises a first finger-receivingchamber 47 b in ahandle 49 of thedish 2, a section ofelastic membrane 48 above the first finger-receivingchamber 47 b, a second finger-receivingchamber 47 a below the section ofelastic membrane 48 in thelid 7, andsqueeze enabling plate 42. Thesqueeze plate 42 is located a predetermined distance above the upperhorizontal ring 20 formed on the outer rim 9 (FIGS. 7 and 7 b). The first finger-receivingchamber 47 b has aninner chamber 52 and an outer opening 51 (FIG. 7 a) sufficiently large to allow afinger 41 to pass through to reach the second finger-receivingchamber 47 a and the section ofelastic membrane 48 to push the elastic membrane to release the vacuum in the dish (FIG. 7 c). -
FIGS. 8 , 8 a, 8 b and 8 c describe a second modified version of thevalve-less vacuum releaser 43 for around vacuum lid 7 comprising a roundelastic membrane 18 with itsperipheral section 28 affixed to therigid rim 24 similar to that described inFIG. 1 . Thevalve-less vacuum releaser 43 comprises a finger-receivingchamber 47 formed by curving or recessing theside wall 6 of thedish 2 and the section ofelastic membrane 48 above the finger receiving chamber (FIGS. 8 and 8 a). Thechamber 47 is sufficiently large to receive a finger or finger-like member 41 to allow the finger to push the section ofelastic membrane 48 to release the vacuum in the dish (FIG. 8 c). In this preferred embodiment, the part of the upperhorizontal ring 20 located a predetermined distance above the section ofelastic membrane 48 could function as thesqueeze enabler 43 to facilitate the release of the vacuum in thedish 2. - A protruded
section 57 is provided on the front part and another protrudedsection 57 on the back part of therim 21 of thedish 2 to formopenings 27 a on the left andopenings 27 b on the right side of the protrudedsections 57. Both the front and back protrudedsections 57 are positioned near the right part of the dish to cause thelid 7 to tilt towards the left side to makeopenings 27 b significantly larger thanopenings 27 a for preventing the microwave induced sucking-in and crushed food problems discussed earlier for thedevice 1 ofFIG. 1 . Theopenings valve-less air evacuator 16 that enables air in the dish to be evacuated when a hand orfinger 25 presses theelastic membrane 18 of the lid into the dish (FIG. 8 b) and enable sufficient closing of theopenings FIG. 8 c). - Another of the problems discovered with the present invention of the
vacuum device 1 inFIG. 1 is the loss of vacuum in thedish 2 after an extended period of storage in freezer and refrigerator. Such loss of vacuum was initially thought due to the presence of thevalve-less air evacuator 16. Later studies found that the vacuum disappeared in several days and sometimes in half a day even if the valve-less air evacuator was intentionally removed from thedevice 1. Such vacuum loss in the dish was found to occur with various elastic membranes such as butyl rubber, ethylene acrylic elastomers, ethylene propylene (or EPDM) rubber, polyurethane elastomers and natural rubber membranes. Although the reason for such vacuum loss was still not understood, it was discovered, quite by accident, that if theelastic membrane 18 was thinned about 12% compared to the membrane's original thickness, the loss of vacuum in thedish 2 was prevented or at least significantly reduced. In several long-term storage tests, it was found that thevacuum lid 7 comprising anelastic membrane 18 that was thinned about 12% could maintain the vacuum in the dish for six months to a year. In comparable tests with the same elastic membrane but with the membrane not thinned in thevacuum lid 7, the vacuumed in thedish 2 lasted only several days. -
FIGS. 9 a-c shows the thinning process for theelastic membrane 18 before affixing it to therigid rim 24. Before the thinning, theelastic membrane 18 was thick and its peripheral edge was clamped by clamp 72 (FIG. 9 ). The elastic membrane was placed between the outerrigid rim 9 andinner rim 10.FIG. 9 b shows theelastic membrane 18 after the membrane was thinned about 25% by stretching theelastic membrane 18 with theclamp 72.FIG. 9 c shows thevacuum lid 7 with the thinned elastic membrane sandwiched between the inner andouter rims 9 an 10. Theinner rim 10 is prevented from separating from theouter rim 9 by theannular channel 11 in theouter rim 9 and theridge 8 on theinner rim 10, where the thickness of theridge 8 plus two times of the thickness of the thinned elastic membrane is larger than the gap forannular channel 11. To prevent the vacuum loss in thedish 2 when stored in refrigerator or freezer, the thinning of theelastic membrane 18 in the vacuum lid should be about 3% or more depending on the nature and original thickness of the elastic membrane, and be preferably more than 8% prior to affixing the membrane to therigid rim 24. - It was found that after the
lid 7 was used to generate and maintain vacuum in the container one or more times, the lid gradually lost its capability to generate and maintain sufficient vacuum for the perishable product. It was further found that the lid's capability to generate and maintain vacuum could be restored, at least partially, by exposing the lid to a hot fluid such as hot water having a temperature higher than 45° C. for about 10 seconds to several minutes. Higher hot fluid temperature up to 95° C. and longer exposing time was found to restore the lid's vacuum generating and maintaining capability in some cases more effectively. - It was discovered that although a
vacuum lid 7 with itselastic membrane 18 thinned as much as 10% could maintain the vacuum in thedish 2 for several weeks to months in freezer or refrigerator, the same vacuum lid could not maintain the vacuum in the dish for more than one or two days in the same refrigerator or freezer after the dish covered by the vacuum lid was heated in microwave oven once or twice. It is believed that the microwave caused certain structural or compositional changes in the thinnedelastic membrane 8 that is detrimental to the preservation of the vacuum between thedish 2 and thevacuum lid 7. Various protections for the elastic membrane, such as covering the elastic membrane by a plastic wrap films and even perforated aluminum foils, were found not effective in preventing such microwave-induced vacuum loss in thedish 2. It was discovered that the vacuum loss, however, could be prevented by thinning the elastic membrane more than 15%, preferably more than 25% before affixing the elastic membrane to therigid rim 24. - It is appreciated that if the container, such as a pitcher or a laboratory glass beaker, has a pouring spout, the
rigid rim 24 may have a curved-out or outwardly protruding section shaped to receive the spout and theelastic membrane 48 may also have an outwardly protruding section attached to the outwardly protruding section of the rigid rim to seal the spout. If the spout has a downward or upward slope, the outwardly protruding sections of the rigid rim and membrane may have a similar slope to allow the outwardly protruding membrane section to seal the spout. It is possible to shape curved-outsection 94 of thevalve-less release valve 43 for sealing the spout. It is also appreciated that the elastic membrane can have various layers as taught in the applicant's U.S. patent application Ser. No. 10/917,016. Particularly, it was discovered that a multi-layer elastic membrane comprising a thin top elastic film layer, a thin bottom elastic film layer and an bonding layer between the thin top and bottom elastic film layers provides significantly improved vacuum seal to the container. By selecting a bonding material such as a soft gel, a viscous liquid or the like that can flow or move within the top and bottom film layers, the membrane forms significantly improved seal to the container. Particularly, the thickness of the multi-layer membrane is reduced at or near the contact area between the membrane and the rim of the container as a result of the fluidity of the bonding materials, thus forming an annual slot on the membrane to receive the rim of the container and improving the seal to the container. The bonding layer is thicker than the bottom elastic film layer, and is preferably 2 to 50 times as thick as the bottom elastic film. By selecting the bonding materials to be hydrophobic, it was found the moisture loss is drastically reduced by the bonding materials. - The scope of the invention is obviously not restricted or limited to the embodiments described by way of examples and depicted in the drawings, there being numerous changes, modifications, additions, and applications thereof imaginable within the purview of the claims.
Claims (20)
1. A vacuum generating device for sealing a perishable product comprising:
an elastic membrane for sealing a containing chamber, said elastic membrane being substantially impermeable to prevent air from permeating through into the containing chamber;
a sufficiently rigid rim connected or adapted to connect to said elastic membrane, said rigid rim comprising a sufficiently rigid material to prevent it from being substantially deformed when said elastic membrane is deformed and air is removed from the chamber to produce a vacuum therein; and
wherein said elastic membrane is sufficiently stretched during the assembly of said device to substantially reduce the thickness of said elastic membrane and maintain said elastic membrane in a stretched condition before said elastic membrane is sealed to the containing chamber, thereby improving the vacuum seal for the perishable product when said elastic membrane is sealed to the containing chamber.
2. A vacuum generating device as defined in claim 1 wherein said elastic membrane is sufficiently stretched to reduce its thickness by at least 3% and affixed to said rigid rim during said assembly, thereby maintaining said elastic membrane in a stretched condition under tension when said device is not in use or not applied to the containing chamber.
3. A vacuum generating device as defined in claim 2 wherein said elastic membrane is sufficiently stretched to reduce its thickness by at least 8% and to affixed to said rigid rim during said assembly.
4. A vacuum generating device as defined in claim 1 wherein said rigid rim comprises a first rigid rim and a second rim, wherein during said assembly said elastic membrane is sandwiched between said first and second rims and stretched to reduce its thickness by at least 3% as compared with the original thickness of the elastic membrane in its original non-stretched condition prior to the assembly.
5. A vacuum generating device as defined in claim 1 wherein said elastic membrane comprises a first section for sealing the containing chamber to form a closed vacuum chamber between said first section and the container and a second section connected to only part of said first section and extending away from the closed vacuum chamber, said second section being substantially smaller than said first section but being sufficiently large to allow a finger or finger-like member to push said elastic membrane up and away from the containing chamber to release the vacuum therein.
6. A vacuum generating device as defined in claim 5 wherein said rigid rim is further characterized by an outwardly protruding section adapted to connect to said second section of said elastic membrane.
7. A vacuum generating device as defined in claim 1 further comprising a vacuum releaser having at least one of a beam and a plate connected to said rigid rim and extending over a section of said elastic membrane to facilitate the release of the vacuum in the containing chamber.
8. A vacuum generating device as defined in claim 1 wherein said rigid rim comprises an annular ring having an inwardly extending ridge that is spaced above the elastic membrane.
9. A vacuum generating device as defined in claim 1 further comprising a valve-less air evacuator comprising a release section of said elastic membrane affixed to said rigid rim, said release section being adapted to be more deformable than at least some other part of said elastic membrane affixed to said rigid rim to enable an air passage to form between said release section and the containing chamber when at least one of a force, pressure and vacuum is applied to said device to remove air from the containing chamber and to be sufficiently elastic to stamp out said air passage when said one of said force, pressure and vacuum force is removed to cause said section to seal to the containing chamber.
10. A vacuum generating device as defined in claim 1 wherein said elastic membrane affixed to said rigid rim in a stretched condition comprises a section having lower tension than at least some other part of said elastic membrane to allow an air passage to form between said section and the containing chamber when at least one of a force, pressure and vacuum is applied to said device to remove air from the containing chamber.
11. A vacuum generating device as defined in claim 1 further comprising a sufficiently rigid center section to prevent said membrane from being sucked into the containing chamber by vacuum.
12. A vacuum generating device as defined in claim 1 further comprising a first outwardly protruding section extending at least partially horizontally out of said rigid rim and a second outwardly protruding section extending out of a part of said elastic membrane and connected to said first outwardly protruding section.
13. A vacuum generating device as defined in claim 12 wherein said first and second outwardly protruding sections have a downward slope adapted to seal to a dispensing spout on the containing chamber.
14. A vacuum generating device for sealing a perishable product comprising:
an elastic membrane for sealing to a container adapted to receive a perishable product, said elastic membrane being substantially impermeable to prevent air from permeating through into the container;
a sufficiently rigid rim connected or adapted to connect to a peripheral section of said elastic membrane, said rigid rim comprising a sufficiently rigid material to prevent it from being substantially deformed when said elastic membrane is deformed;
wherein said elastic membrane is adapted to tend to rebound to cause a vacuum to form in a closed chamber between said elastic membrane and the container after at least part of the air in said closed chamber is removed;
a vacuum releaser connected to said rigid rim for facilitating the release of the vacuum in the container, said vacuum releaser comprising a material substantially more rigid than said elastic membrane; and
wherein said vacuum releaser is further characterized by extending from said rigid rim inwardly and by being spaced above said elastic membrane.
15. A vacuum generating device as defined in claim 14 wherein said vacuum releaser comprises at least one of a beam and a plate connected to said rigid rim and extending inwardly over a section of said elastic membrane.
16. A vacuum generating device as defined in claim 14 wherein said vacuum releaser comprises an inwardly extending annular ring or ridge that is spaced above said elastic membrane.
17. A vacuum generating device for sealing a perishable product comprising:
an elastic membrane having a first section for sealing to a chamber to produce a closed vacuum chamber between said first section and the chamber for preserving the perishable product therein and a second section connected to a part of said first section and extending out of the chamber, said second section being substantially smaller than said first section;
a rim connected or adapted to connect to said elastic membrane, said rim being sufficiently rigid to facilitate the formation and preservation of a vacuum in the container;
wherein said rim comprises at least one of an outwardly protruding section and inwardly receding section; and
a valve-less vacuum releaser for releasing the vacuum in the closed vacuum chamber, said releaser comprising said second section of said elastic membrane and said one of said outwardly protruding and inwardly receding sections, said second section of said elastic membrane being defined by said one of said outwardly protruding and inwardly receding sections of said rim, wherein said second section of said elastic membrane is sufficiently large to allow a finger or finger-like member to press onto and push said elastic membrane up and away from the chamber to release the vacuum in the closed vacuum chamber.
18. A vacuum generating device as defined in claim 17 wherein said valve-less vacuum releaser further comprises a squeeze-enabler connected to said rim, the squeeze-enabler extending over and being spaced above said elastic membrane to enable a finger to place on said squeeze-enabler to cooperate another finger or finger-like member underneath said elastic membrane to squeeze to release the vacuum in the closed vacuum chamber.
19. A vacuum generating device as defined in claim 17 wherein said rim further comprises at least one of plate, beam and ridge that extends inwardly at least partly horizontally and is spaced above said elastic membrane.
20. A vacuum generating device for sealing a perishable product comprising:
an elastic membrane for sealing a container, said elastic membrane being substantially impermeable to prevent air from permeating through into the container;
a sufficiently rigid rim connected or adapted to connect to said elastic membrane, said rigid rim comprising a sufficiently rigid material to prevent it from being substantially deformed when said elastic membrane is deformed and air is removed from the container to produce a vacuum therein;
wherein said elastic membrane comprises a first elastic membrane adapted to seal to the container and face the perishable product, a second elastic membrane above said first membrane, and a bonding layer between said first and second elastic membranes; and
wherein the material in said bonding layer is sufficiently fluidic to be moved from a first location to a second location in the space between said first and second elastic membranes.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/586,452 US20100018169A1 (en) | 2006-08-05 | 2009-09-22 | Vacuum generating device for sealing perishable products and method of use |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/499,280 US7594586B2 (en) | 2006-08-05 | 2006-08-05 | Vacuum generating device for sealing perishable products and method of use |
US12/586,452 US20100018169A1 (en) | 2006-08-05 | 2009-09-22 | Vacuum generating device for sealing perishable products and method of use |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US11/499,280 Continuation-In-Part US7594586B2 (en) | 2006-08-05 | 2006-08-05 | Vacuum generating device for sealing perishable products and method of use |
Publications (1)
Publication Number | Publication Date |
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US20100018169A1 true US20100018169A1 (en) | 2010-01-28 |
Family
ID=41567391
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US12/586,452 Abandoned US20100018169A1 (en) | 2006-08-05 | 2009-09-22 | Vacuum generating device for sealing perishable products and method of use |
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Country | Link |
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US (1) | US20100018169A1 (en) |
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2009
- 2009-09-22 US US12/586,452 patent/US20100018169A1/en not_active Abandoned
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