WO2009117774A1 - A fabric for reducing free water due to condensation and thermal packaging incorporating same - Google Patents

A fabric for reducing free water due to condensation and thermal packaging incorporating same Download PDF

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Publication number
WO2009117774A1
WO2009117774A1 PCT/AU2009/000344 AU2009000344W WO2009117774A1 WO 2009117774 A1 WO2009117774 A1 WO 2009117774A1 AU 2009000344 W AU2009000344 W AU 2009000344W WO 2009117774 A1 WO2009117774 A1 WO 2009117774A1
Authority
WO
WIPO (PCT)
Prior art keywords
free water
fabric
condensation
woven
thermal packaging
Prior art date
Application number
PCT/AU2009/000344
Other languages
French (fr)
Inventor
Donald Lindley Henry
Original Assignee
Mendad Pty Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from AU2008901403A external-priority patent/AU2008901403A0/en
Application filed by Mendad Pty Ltd filed Critical Mendad Pty Ltd
Publication of WO2009117774A1 publication Critical patent/WO2009117774A1/en

Links

Classifications

    • 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
    • B65D81/38—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 with thermal insulation
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F7/00—Heating or cooling appliances for medical or therapeutic treatment of the human body
    • A61F7/10—Cooling bags, e.g. ice-bags
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F7/00—Heating or cooling appliances for medical or therapeutic treatment of the human body
    • A61F7/02—Compresses or poultices for effecting heating or cooling
    • A61F2007/0244—Compresses or poultices for effecting heating or cooling with layers
    • A61F2007/0258—Compresses or poultices for effecting heating or cooling with layers with a fluid permeable layer
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F7/00—Heating or cooling appliances for medical or therapeutic treatment of the human body
    • A61F7/02—Compresses or poultices for effecting heating or cooling
    • A61F2007/0244—Compresses or poultices for effecting heating or cooling with layers
    • A61F2007/026—Compresses or poultices for effecting heating or cooling with layers with a fluid absorbing layer
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F7/00—Heating or cooling appliances for medical or therapeutic treatment of the human body
    • A61F7/0097—Blankets with active heating or cooling sources
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
    • F25D21/04—Preventing the formation of frost or condensate
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D3/00—Devices using other cold materials; Devices using cold-storage bodies
    • F25D3/02—Devices using other cold materials; Devices using cold-storage bodies using ice, e.g. ice-boxes

Definitions

  • the present invention relates to the elimination or reduction of free water due to condensation associated with cold packing material.
  • the invention finds particular application where a cold pack is required that will have improved resistance to the formation of free water.
  • Cold packages are frequently used, for example to assist in the transportation of goods that must be kept at a reduced temperature to avoid spoilage, or in the treatment of athletic injuries.
  • the packaging assembly is comprised of a plurality of pouches, each having a flexible outer skin containing a thermal controlling agent.
  • the pouches may be provided in a continuous sheet in bubble pack form to be laid upon an item to be packed.
  • Condensation may occur over a wide range of temperatures, for example where room temperature atmosphere contacts refrigerator temperature packaging.
  • the temperature range most susceptible to production of condensation is 0° C. to 1O 0 C, which is considered the standard refrigerator temperature.
  • Production of condensation, particularly where the ambient atmosphere has a high humidity content may result in substantial free water that can be deleteriously affect packaging and in some circumstances damage the very goods that are packed.
  • One method of reducing damage due to free water is to include absorbent paper towels about the cold packaging to prevent the free water pooling.
  • dehumidifying materials may also be used to combat the problem of free water.
  • dehumidifying agents include silica gel and soda powder for example. However, such agents are usually insufficient to overcome the problem of free water formation.
  • a thermal packaging assembly including: a moisture impervious inner layer for location adjacent a refrigerant; and a condensate dispersal layer disposed on a side of said inner layer opposing the refrigerant.
  • the condensate dispersal layer includes a hydrophilic material.
  • the condensate dispersal layer includes a non-woven fabric.
  • the non-woven fabric is impregnated with a surfactant.
  • the non-woven fabric may comprise spunbond polypropylene.
  • Figure 1 is a perspective view of a prior art cold packaging blanket.
  • Figure 2 is a cross-section of the blanket of Figure 1.
  • Figure 3 is cross-section of a blanket similar to Figure 1 incorporating a preferred embodiment of the present invention.
  • Figure 1 is a perspective view of a prior art thermal blanket comprised of a continuous sheet of pillow-shaped pouches.
  • the blanket is typically made with polyethylene walls 4 enclosing a refrigerant 6.
  • Figure 2 is a cross section through two pouches of the same blanket. Each of the pouches is filled with a suitable refrigerant 6 as detailed in the previously mentioned U.S. patent No. 4,931 ,333 for example.
  • the polyethylene walls 4 present a moisture impervious inner layer adjacent refrigerant 6.
  • Figure 3 is a cross section through a blanket according to an embodiment of the present invention.
  • dispersal layer 8 has been incorporated.
  • the dispersal layer is provided in the form of a hydrophilic material being a non-woven hydrophilic fabric treated with a surfactant.
  • the inventor has identified a suitable material for dispersal layer 8 being a non-woven spunbond polypropylene fabric with incorporated surfactant available from Jen-Coat, Inc. of 132 North Elm Street, Westfield, MA 01086 U.S.A.
  • non-woven cloth absorbs condensate on the outside of the blanket.
  • the surfactant acts to disperse the condensate into a thin film on the outside of the non-woven cloth which is then more easily evaporated before it can pool to form free water globules.
  • Other mechanisms which achieve the same dispersal effect might also be employed. For example micro roughening of the outer surface of the non-woven fabric may also provide for a sufficiently large surface to reduce free water formation.
  • a blot test was used to measure the moisture on the surface of the alternative products. Frozen sheets, 21.6cm x 10.2cm of cooling blanket with and without the dispersal layer were laid on a granite sink top for 30 minutes at ambient temperature of 25°C and a relative humidity of 82% prior to the blot test.
  • each sheet was given a blot test and its surface temperature was measured.
  • the blot test placing a double folded absorbent tissue on the top surface of each frozen sheet and gently pressing it on to the surface. The tissue was then weighed on an electronic scale calibrated to measure in grams. The weights shown below are the average of ten replicated tests.
  • the dispersal layer allows the surface moisture to evaporate more readily, due in part, to the much larger moisture surface made possible by the surfactant.
  • the surfactant reduces the surface tension of a liquid allowing it to spread out without forming globules of water as would otherwise be the case.
  • condensation formed by ambient air coming in contact with the cold surface 4 of blanket 5 is absorbed by the non-woven hydrophilic cloth 8.
  • the surfactant impregnated within cloth 8 causes the condensation to disburse into a thin film of water that will more readily evaporate.
  • a cooling blanket, or similar product incorporating the laminate may be most efficiently produced by operation of a Lane W-18 pouch making machine.
  • a Lane W-18 pouch making machine is available from Winpak Ltd of 100 Saulteaux Crescent, Winnipeg, MB R3J3T3 Canada.

Landscapes

  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Biomedical Technology (AREA)
  • Mechanical Engineering (AREA)
  • Vascular Medicine (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Laminated Bodies (AREA)
  • Packages (AREA)

Abstract

The invention addresses a problem associated with cold packaging systems being that of free water forming due to condensation. A cold packaging blanket according to an embodiment of the present invention includes a dispersal layer provided in the form of a hydrophilic material, being a non-woven hydrophilic fabric treated with a surfactant. Preferably the dispersal layer comprises a non-woven spunbond polypropylene fabric. Due to its hydrophilic nature the non-woven fabric absorbs condensate on the outside of the blanket. The surfactant acts to disperse the condensate into a thin film on the outside of the non-woven cloth which is then more easily evaporated before it can pool to form free water globules.

Description

A FABRIC FOR REDUCING FREE WATER DUE TO CONDENSATION AND THERMAL PACKAGING INCORPORATING SAME
TECHNICAL FIELD
The present invention relates to the elimination or reduction of free water due to condensation associated with cold packing material. The invention finds particular application where a cold pack is required that will have improved resistance to the formation of free water.
BACKGROUND
Cold packages are frequently used, for example to assist in the transportation of goods that must be kept at a reduced temperature to avoid spoilage, or in the treatment of athletic injuries.
In U.S. patent No. 4,931 ,333 to the present inventor there is described a reusable thermal packaging assembly. The packaging assembly is comprised of a plurality of pouches, each having a flexible outer skin containing a thermal controlling agent. The pouches may be provided in a continuous sheet in bubble pack form to be laid upon an item to be packed.
A problem that occurs in relation to the cold packaging system described above, and also in relation to most other cold packing systems, is that of free water forming due to condensation.
Condensation may occur over a wide range of temperatures, for example where room temperature atmosphere contacts refrigerator temperature packaging. The temperature range most susceptible to production of condensation is 0° C. to 1O0C, which is considered the standard refrigerator temperature. Production of condensation, particularly where the ambient atmosphere has a high humidity content, may result in substantial free water that can be deleteriously affect packaging and in some circumstances damage the very goods that are packed. One method of reducing damage due to free water is to include absorbent paper towels about the cold packaging to prevent the free water pooling.
A variety of dehumidifying materials may also be used to combat the problem of free water. These dehumidifying agents include silica gel and soda powder for example. However, such agents are usually insufficient to overcome the problem of free water formation.
It is an object of the present invention to provide a means for addressing the above problem.
SUMMARY OF THE INVENTION
According to a first aspect of the present invention there is provided a thermal packaging assembly including: a moisture impervious inner layer for location adjacent a refrigerant; and a condensate dispersal layer disposed on a side of said inner layer opposing the refrigerant. Preferably the condensate dispersal layer includes a hydrophilic material.
In the preferred embodiment the condensate dispersal layer includes a non-woven fabric.
It is preferable that the non-woven fabric is impregnated with a surfactant.
The non-woven fabric may comprise spunbond polypropylene.
BRIEF DESCRIPTION OF THE DRAWINGS
Preferred features, embodiments and variations of the invention may be discerned from the following Detailed Description which provides sufficient information for those skilled in the art to perform the invention. The Detailed Description is not to be regarded as limiting the scope of the preceding Summary of the Invention in any way. The Detailed Description will make reference to a number of drawings as follows: Figure 1 is a perspective view of a prior art cold packaging blanket. Figure 2 is a cross-section of the blanket of Figure 1. Figure 3 is cross-section of a blanket similar to Figure 1 incorporating a preferred embodiment of the present invention.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
Figure 1 is a perspective view of a prior art thermal blanket comprised of a continuous sheet of pillow-shaped pouches. The blanket is typically made with polyethylene walls 4 enclosing a refrigerant 6.
Figure 2 is a cross section through two pouches of the same blanket. Each of the pouches is filled with a suitable refrigerant 6 as detailed in the previously mentioned U.S. patent No. 4,931 ,333 for example. The polyethylene walls 4 present a moisture impervious inner layer adjacent refrigerant 6.
As previously discussed, a problem with cool packaging such as the thermal blanket depicted in Figures 1 and 2 is that condensation may form which can then poo! as free water.
Figure 3 is a cross section through a blanket according to an embodiment of the present invention. It will be noted that dispersal layer 8 has been incorporated. In the present embodiment the dispersal layer is provided in the form of a hydrophilic material being a non-woven hydrophilic fabric treated with a surfactant. The inventor has identified a suitable material for dispersal layer 8 being a non-woven spunbond polypropylene fabric with incorporated surfactant available from Jen-Coat, Inc. of 132 North Elm Street, Westfield, MA 01086 U.S.A.
Due to its hydrophilic nature the non-woven cloth absorbs condensate on the outside of the blanket. The surfactant acts to disperse the condensate into a thin film on the outside of the non-woven cloth which is then more easily evaporated before it can pool to form free water globules. Other mechanisms which achieve the same dispersal effect might also be employed. For example micro roughening of the outer surface of the non-woven fabric may also provide for a sufficiently large surface to reduce free water formation.
Test Results
Tests were performed to determine the moisture and free water production of a prior art product similar to that of Figure 1 with each pouch holding a refrigerant volume of approximately 12 milliliters. A comparison test was preferred on a corresponding product incorporating dispersal layer 8, similar to that depicted in Figure 3.
A blot test was used to measure the moisture on the surface of the alternative products. Frozen sheets, 21.6cm x 10.2cm of cooling blanket with and without the dispersal layer were laid on a granite sink top for 30 minutes at ambient temperature of 25°C and a relative humidity of 82% prior to the blot test.
At 30 minutes the surface of each sheet was given a blot test and its surface temperature was measured. The blot test placing a double folded absorbent tissue on the top surface of each frozen sheet and gently pressing it on to the surface. The tissue was then weighed on an electronic scale calibrated to measure in grams. The weights shown below are the average of ten replicated tests.
Results: Without Dispersal Layer
Temp: 1°C to 3°C
Free water: 0.76 gm
Results: With Dispersal Layer Temp: 2°C to 3°C Free water: 0.37 gm The above test results show a 51 % reduction in moisture absorbed by the tissue due to the presence of the hydrophilic surfactant impregnated dispersal layer.
It appears that the dispersal layer allows the surface moisture to evaporate more readily, due in part, to the much larger moisture surface made possible by the surfactant. As the reader will be aware, the surfactant reduces the surface tension of a liquid allowing it to spread out without forming globules of water as would otherwise be the case.
In short, condensation formed by ambient air coming in contact with the cold surface 4 of blanket 5 is absorbed by the non-woven hydrophilic cloth 8. In turn the surfactant impregnated within cloth 8 causes the condensation to disburse into a thin film of water that will more readily evaporate.
From a manufacturing perspective, a cooling blanket, or similar product incorporating the laminate may be most efficiently produced by operation of a Lane W-18 pouch making machine. Such a machine is available from Winpak Ltd of 100 Saulteaux Crescent, Winnipeg, MB R3J3T3 Canada.
A surfactant is described in U.S. patent No. 6,608,124 whilst European patent application EP1522620A1 , in the name of Kuraray Co. Ltd, provides an example of a non-woven fabric.
The word "comprises" and its variations is used herein, both in the description and claims, in its inclusive sense and not to the exclusion of any additional integers. In particular, "comprises" and its variations is not used synonymously with the phrase "consisting of.
In compliance with the statute, the invention has been described in language more or less specific to structural or methodical features. It is to be understood that the invention is not limited to specific features shown or described since the means herein described comprises preferred forms of putting the invention into effect. The invention is, therefore, claimed in any of its forms or modifications within the proper scope of the appended claims appropriately interpreted by those skilled in the art.

Claims

The claims defining the invention are as follows:
1. A thermal packaging assembly including: a moisture impervious inner layer for location adjacent a refrigerant; and a condensate dispersal layer disposed on a side of said inner layer opposing the refrigerant.
2. A thermal packaging assembly according to claim 1 , wherein the condensate dispersal layer includes a hydrophilic material.
3. A thermal packaging assembly according to claim 1 or claim 2, wherein the condensate dispersal layer includes a non-woven fabric.
4. A thermal packaging assembly according to claim 3, wherein the non-woven fabric is impregnated with a surfactant.
5. A thermal packaging assembly according to claim 3 or claim 4, wherein the non-woven fabric comprises spunbond polypropylene.
6. A thermal packaging assembly substantially as described herein with reference to Figure 3.
PCT/AU2009/000344 2008-03-25 2009-03-25 A fabric for reducing free water due to condensation and thermal packaging incorporating same WO2009117774A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU2008901403A AU2008901403A0 (en) 2008-03-25 A fabric for reducing free water due to condensation and thermal packaging incorporating same
AU2008901403 2008-03-25

Publications (1)

Publication Number Publication Date
WO2009117774A1 true WO2009117774A1 (en) 2009-10-01

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105129210A (en) * 2015-08-27 2015-12-09 天津瀛德科技有限公司 Cold accumulation packing bag
CN105151539A (en) * 2015-08-27 2015-12-16 天津瀛德科技有限公司 Temperature sensing cold storage packaging bag
CN105151538A (en) * 2015-08-27 2015-12-16 天津瀛德科技有限公司 Cold storage packaging bag
CN105151540A (en) * 2015-08-27 2015-12-16 天津瀛德科技有限公司 Cold storage packaging bag
CN114180193A (en) * 2020-09-12 2022-03-15 左点实业（湖北）有限公司 Cold compress appearance with accomodate base

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4931333A (en) * 1985-09-23 1990-06-05 Henry D Lindley Thermal packaging assembly
US5993433A (en) * 1997-10-20 1999-11-30 Kimberly-Clark Worldwide, Inc. Absorbent article with enhanced elastic design for improved aesthetics and containment
US6508797B1 (en) * 2000-11-03 2003-01-21 Kimberly-Clark Worldwide, Inc. Pant-like disposable absorbent articles with a releasable line of weakness and a fastener
US20040243080A1 (en) * 2003-05-27 2004-12-02 Bba Nonwovens Simpsonville, Inc. Absorbent pads

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4931333A (en) * 1985-09-23 1990-06-05 Henry D Lindley Thermal packaging assembly
US5993433A (en) * 1997-10-20 1999-11-30 Kimberly-Clark Worldwide, Inc. Absorbent article with enhanced elastic design for improved aesthetics and containment
US6508797B1 (en) * 2000-11-03 2003-01-21 Kimberly-Clark Worldwide, Inc. Pant-like disposable absorbent articles with a releasable line of weakness and a fastener
US20040243080A1 (en) * 2003-05-27 2004-12-02 Bba Nonwovens Simpsonville, Inc. Absorbent pads

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105129210A (en) * 2015-08-27 2015-12-09 天津瀛德科技有限公司 Cold accumulation packing bag
CN105151539A (en) * 2015-08-27 2015-12-16 天津瀛德科技有限公司 Temperature sensing cold storage packaging bag
CN105151538A (en) * 2015-08-27 2015-12-16 天津瀛德科技有限公司 Cold storage packaging bag
CN105151540A (en) * 2015-08-27 2015-12-16 天津瀛德科技有限公司 Cold storage packaging bag
CN114180193A (en) * 2020-09-12 2022-03-15 左点实业（湖北）有限公司 Cold compress appearance with accomodate base

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