WO2014082014A1 - Couvercle de protection thermique et son procédé de fabrication - Google Patents

Couvercle de protection thermique et son procédé de fabrication Download PDF

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Publication number
WO2014082014A1
WO2014082014A1 PCT/US2013/071506 US2013071506W WO2014082014A1 WO 2014082014 A1 WO2014082014 A1 WO 2014082014A1 US 2013071506 W US2013071506 W US 2013071506W WO 2014082014 A1 WO2014082014 A1 WO 2014082014A1
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WO
WIPO (PCT)
Prior art keywords
protective cover
layer
thermally protective
foam
temperature
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/US2013/071506
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English (en)
Inventor
Srinivas Cherukupalli
Atanu ACHARYA
Raghvendra Singh PAL
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
EIDP Inc
Original Assignee
EI Du Pont de Nemours and Co
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
Application filed by EI Du Pont de Nemours and Co filed Critical EI Du Pont de Nemours and Co
Priority to US14/646,580 priority Critical patent/US20150291327A1/en
Publication of WO2014082014A1 publication Critical patent/WO2014082014A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/02—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by features of form at particular places, e.g. in edge regions
    • B32B3/04—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by features of form at particular places, e.g. in edge regions characterised by at least one layer folded at the edge, e.g. over another layer ; characterised by at least one layer enveloping or enclosing a material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/046—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of foam
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/14—Layered products comprising a layer of metal next to a fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/10—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material
    • B32B3/12—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material characterised by a layer of regularly- arranged cells, e.g. a honeycomb structure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B32B5/022—Non-woven fabric
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/18—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by features of a layer of foamed material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
    • B32B5/24—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
    • B32B5/245—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it being a foam layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00—Coating on the layer surface
    • B32B2255/02—Coating on the layer surface on fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00—Coating on the layer surface
    • B32B2255/20—Inorganic coating
    • B32B2255/205—Metallic coating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/02—Synthetic macromolecular fibres
    • B32B2262/0253—Polyolefin fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/02—Synthetic macromolecular fibres
    • B32B2262/0276—Polyester fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2266/00—Composition of foam
    • B32B2266/02—Organic
    • B32B2266/0207—Materials belonging to B32B25/00
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2266/00—Composition of foam
    • B32B2266/02—Organic
    • B32B2266/0214—Materials belonging to B32B27/00
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/30—Properties of the layers or laminate having particular thermal properties
    • B32B2307/304—Insulating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/416—Reflective
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/724—Permeability to gases, adsorption
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/724—Permeability to gases, adsorption
    • B32B2307/7242—Non-permeable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2419/00—Buildings or parts thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
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    • B32B2439/00—Containers; Receptacles
    • B32B2439/70—Food packaging
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2439/00—Containers; Receptacles
    • B32B2439/80—Medical packaging
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B2553/00—Packaging equipment or accessories not otherwise provided for
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2571/00—Protective equipment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2605/00—Vehicles
    • B32B2605/08—Cars

Definitions

  • the present invention relates to thermally protective cover for storage or transportation of temperature sensitive material which is to be maintained at or near their temperature at the time of packaging.
  • This invention also relates to a method of manufacture of thermal barriers for transport and storage of articles having improved thermal protection properties for temperature sensitive materials.
  • Styofoam ® is one of the commonly used insulation material. These problems are so severe that many countries ban the use of Styrofoam ®, thus severely restricting international shipments of biological materials.
  • the cooling agents also present numerous practical problems in field use. Specifically, gel systems are often too expensive for routine use and disposal. As for dry ice, the carbon dioxide gas evolved during shipment may be dangerous to personnel involved with packing and transportation of the shipment. Wet ice poses handling problems in packing, as well as leakage and product soaking problems. Many previously existing shipping systems also suffer the disadvantage that they are not capable of maintaining the shipped product or payload within a target temperature range. Various biological products, such as platelets, whole blood, semen, organs and tissue, must be maintained above a predetermined minimum temperature and below a predetermined maximum temperature. Pharmaceutical products are also commonly required to be kept within a specified temperature range. Food products, flowers and produce frequently have preferred storage temperature ranges as well. Many known methods and systems for shipping such products are not able to keep temperatures within the desired range. The result of this practice is excessive cooling, frequently resulting in damage to the product.
  • Vaccines and serums are expected to be maintained, in most cases, between 2 - 8 °C for 48 - 100 hours (depending on destination) during shipment through air or road. This requirement is typically achieved by using a Styrofoam® box filled with adequate gel packs to maintain the required product temperature. However, with increasing exposure to ambient conditions, the gel pack efficiency decreases and thereby puts the product at risk of losing potency.
  • thermal protective cover which significantly increases the time at which the product stays between a required temperature range and which is easy to manufacture, use and is also more cost effective. This would result in better protection for temperature sensitive products with more economical solutions for transporting and preserving them.
  • An object of the present invention is to provide a thermal protection cover having improved air permeability to protect pharma /bio pharma products or other such temperature sensitive materials from temperature excursions primarily during shipment or transportation.
  • This invention provides a thermal protection cover having improved air permeability to protect pharma /bio pharma products or other such temperature sensitive materials from temperature excursions during shipment primarily during shipment or transportation.
  • the invention is directed to a multilayered thermally protective cover for protecting temperature sensitive material.
  • the cover has an outer surface and an inner surface relative to the material and comprises a plurality of layers such that;
  • an outer layer adjacent to the outer surface is a plexifilamentary web comprising a multiplicity of fibers
  • an inner layer adjacent to the inner surface is a nonwoven web, an internal layer or layers located between the outer and inner layers comprises closed cell polymeric foam;
  • the protective cover is impermeable to air.
  • the cover further comprises a layer of connected vacuum panels, each panel having a porous core layer enveloped in a skin layer and at least partially evacuated, and having a metal foil covering that completely envelops the skin layer.
  • FIG. 1 is a sectional view of the thermal protection cover of a first embodiment of the present invention:
  • Figure 2 is a sectional view of the thermal protection cover of a second embodiment of the present invention:
  • Figure 3 is a sectional view of a vacuum insulation panel:
  • Figure 4 is a data logger chart comparing temperature profiles for maximum ambient temperature of 40°C.
  • Figure 5 is a data logger chart comparing temperature profiles for average exposure temperature of 33 °C in the absence of sunlight.
  • Figure 6 is a data logger chart comparing temperature profiles for maximum ambient temperature of 37°C.
  • Fig. Figure 7 is a data logger chart comparing temperature profiles for maximum exposure temperature of 32°C in direct sunlight.
  • Figure 8 is a data logger chart comparing temperature profiles for average exposure temperature of 25°C in direct sunlight.
  • Figure 9 is a data logger chart comparing temperature profiles for exposure in direct sunlight.
  • Figure 10 is a data logger chart comparing temperature profiles for exposure in direct sunlight.
  • polymer as used herein, generally includes but is not limited to, homopolymers, copolymers (such as for example, block, graft, random and alternating copolymers), terpolymers, etc., and blends and modifications thereof. Furthermore, unless otherwise specifically limited, the term “polymer” shall include all possible geometrical configurations of the material.
  • configurations include, but are not limited to isotactic, syndiotactic, and random symmetries.
  • polyolefin as used herein, is intended to mean any of a series of largely saturated polymeric hydrocarbons composed only of carbon and hydrogen.
  • Typical polyolefins include, but are not limited to, polyethylene, polypropylene, polymethylpentene, and various combinations of the monomers ethylene, propylene, and methylpentene.
  • polyethylene as used herein is intended to encompass not only homopolymers of ethylene, but also copolymers wherein at least 85% of the recurring units are ethylene units such as copolymers of ethylene and alpha- olefins.
  • Preferred polyethylenes include low-density polyethylene, linear low- density polyethylene, and high-density polyethylene.
  • a preferred high-density polyethylene has an upper limit melting range of about 130°C to 140°C, a density in the range of about 0.941 to 0.980 gram per cubic centimeter, and a melt index (as defined by ASTM D-1238-57T Condition E) of between 0.1 and 100, and preferably less than 4.
  • polypropylene as used herein is intended to embrace not only homopolymers of propylene but also copolymers where at least 85% of the recurring units are propylene units.
  • Preferred polypropylene polymers include isotactic polypropylene and syndiotactic polypropylene.
  • plexifilament as used herein means a three-dimensional integral network or web of a multitude of thin, ribbon-like, film-fibril elements of random length. Typically, these have a mean film thickness of less than about 4 micrometers and a median fibril width of less than about 25 micrometers. The average film-fibril cross sectional area if mathematically converted to a circular area would yield an effective diameter between about 1 micrometer and 25 micrometers.
  • the film-fibril elements intermittently unite and separate at irregular intervals in various places throughout the length, width and thickness of the structure to form a continuous three-dimensional network. Examples of plexifilamentary webs are those produced by the processes described in U.S. patents 3,081 ,519 (Blades et al.), 3,169,899
  • nonwoven means a web including a multitude of randomly distributed fibers.
  • the fibers generally can be bonded to each other or can be unbonded.
  • the fibers can be staple fibers or continuous fibers.
  • the fibers can comprise a single material or a multitude of materials, either as a combination of different fibers or as a combination of similar fibers each comprised of different materials.
  • An as-spun nonwoven of the present invention can be consolidated by processes known in the art (e.g. calendering) in order to impart the desired improvements in physical properties.
  • the term "consolidated" generally means that the nonwoven has been through a process in which it is compressed and its overall porosity has been reduced.
  • the as- spun nonwoven is fed into the nip between two unpatterned rolls in which one roll is an unpatterned soft roll and one roll is an unpatterned hard roll.
  • one roll is a hard metal, such as stainless steel, and the other a soft-metal or polymer-coated roll or a composite roll having a hardness less than Rockwell B 70.
  • the residence time of the web in the nip between the two rolls is controlled by the line speed of the web, preferably between about 1 m/min and about 50 m/min, and the footprint between the two rolls is the machine direction (MD) distance that the web travels in contact with both rolls simultaneously.
  • MD machine direction
  • the footprint is controlled by the pressure exerted at the nip between the two rolls and is measured generally in force per linear cross-direction (CD) dimension of roll, and is preferably between about 1 mm and about 30 mm.
  • the nonwoven web can be stretched, optionally while being heated to a temperature that is between the glass-transition temperature (T g ) and the lowest onset-of-melting temperature (T om ) of the fiber polymer.
  • the stretching can take place either before and/or after the web passes through the calender roll nip, and in either or both of the MD or CD.
  • continuous when applied to fibers means that the fibers have been laid down during the manufacture of a nonwoven structure in one
  • meltblown fibers are fibers formed by extruding a molten thermoplastic material through a plurality of fine, usually circular, die capillaries as molten threads or filaments into converging, usually hot and high velocity, gas, e.g. air, streams to attenuate the filaments of molten thermoplastic material and form fibers.
  • gas e.g. air
  • the diameter of the molten filaments is reduced by the drawing air to a desired size.
  • the melt blown fibers are carried by the high velocity gas stream and are deposited on a collecting surface to form a web of randomly disbursed melt blown fibers.
  • Such a process is disclosed, for example, in U.S. Pat.
  • meltblown fibers may be continuous or discontinuous.
  • spunbond fibers refers to small diameter fibers which are formed by extruding molten thermoplastic material as filaments from a plurality of fine, usually circular capillaries of a spinnerette with the diameter of the extruded filaments then being rapidly reduced as by, for example, in U.S. Pat. No. 4,340,563 to Appel et al., and U.S. Pat. No. 3,692,618 to Dorschner et al., U.S. Pat. No. 3,802,817 to Matsuki et al ., U.S. Pat. Nos. 3,338,992 and
  • Spunbond fibers are generally continuous and larger than 7 microns, more particularly, they are usually between about 15 and 50 microns.
  • Spunbond and melt blown fibers can be laminated together, for example into spunbond-meltblwon-spunbond structures, designated here as "SMS.”
  • SMS structures can also be calendered.
  • thermally protective cover refers to an article which aids in protecting against thermal excursions of a product or the material to be thermally protected or transported;
  • Radiative barrier refers to materials which allows for an efficient reflectivity of solar radiation
  • insulation layer refers to a structure designed to reduce or minimize heat transfer there through
  • air permeability refers to the time required for specific volume of air under unit pressure to pass through unit area , as measured by standard Gurley method and expressed as seconds per 100 cc of air;
  • reflectivity refers to the ability to reflect electromagnetic radiation
  • emissivity refers to the ability of a material to re-emit absorbed thermal energy as radiation
  • R-value is defined as the thermal resistivity of a material as measured by a guarded hot plate instrument
  • reduced atmospheric pressure refers to a condition of lowered concentration of air within a confined space as compared to atmospheric pressure.
  • “Gurley method” is based on the principle that air is compressed by the weight of a vertical cylinder floating in a liquid. A test piece is in contact with the compressed air and the cylinder falls steadily as air passes through the test piece. The time for a given volume of air to pass through the test piece, i.e. the air resistance is measured and from this the air permeability is calculated.
  • One aspect of this invention is a multilayered thermally protective cover for protecting temperature sensitive material, said cover having an outer surface and an inner surface relative to the material and comprising a plurality of layers such that;
  • an outer layer adjacent to the outer surface is a plexifilamentary web comprising a multiplicity of fibers
  • an inner layer adjacent to the inner surface is a nonwoven web
  • an internal layer or layers located between the outer and inner layers comprises closed cell polymeric foam
  • the protective cover is impermeable to air.
  • the multilayered thermally protective cover further comprises a layer of connected vacuum panels, each panel having a porous core layer enveloped in a skin layer and at least partially evacuated, and having a metal foil covering that completely envelops the skin layer.
  • the nonwoven web is a spunbond nonwoven of polyolefin.
  • the polyolefin is a polyethylene, polypropylene, polybutene, or a blend or copolymer thereof.
  • the plexifilamentary web is preferably a flash spun polyolefin web.
  • the multilayered thermally protective cover further comprises a radiative barrier layer located between the nonwoven layer and the foam layer. In another embodiment of the present invention , the multilayered thermally protective cover further comprises a radiative barrier coating on at least a portion of the fibers of the plexifilamentary web..
  • the plexifilamentary web has a reflectivity of at least 50 % in the wavelength region of 400-700 nm.
  • the radiative barrier layer has a reflectivity of at least 20% in the wavelength region of 100 - 3000 nm and an emissivity of at least 0.05.
  • the radiative barrier layer is selected from a group consisting of metal foils, nonwovens, microporous membranes, perforated sheets, porous cellulosic sheets or combinations thereof.
  • the foam layer has an R- value of 0.1 -13 m2K/W.
  • the foam layer is selected from the group consisting of nitrile rubber foam, nitrile rubber blended with polyvinyl chloride foam, crosslinked polyethylene foam, polyurethane foam, polystyrene foam, water filled super absorbent polymer or combinations thereof .
  • Fig. 1 is a sectional view of the thermal protection cover of a first embodiment of the present invention:
  • Fig. 2 is a sectional view of the thermal protection cover of a second embodiment of the present invention:
  • Fig. 3 is a sectional view of the vacuum insulation panel:
  • Fig. 4 is a data logger chart comparing temperature profiles for maximum ambient temperature of 40°C.
  • Fig. 5 is a data logger chart comparing temperature profiles for average exposure temperature of 33 °C in the absence of sunlight. 1 . Temperature profile for Tyvek® 1048A cover
  • Temperature profile for stitched cover comprising of Tyvek® 1048A, 6 mm nitrile rubber closed cell insulation, and spun bond polypropylene
  • Fig. 6 is a data logger chart comparing temperature profiles for maximum ambient temperature of 37°C.
  • Temperature profile for stitched cover comprising of Tyvek® 3563M, 9 mm nitrile rubber closed cell insulation, and spun bond polypropylene
  • Fig. 7 is a data logger chart comparing temperature profiles for maximum exposure temperature of 32°C in direct sunlight.
  • Temperature profile for cover comprising of Tyvek® 1048A and laminated super absorbent polymer
  • Fig. 8 is a data logger chart comparing temperature profiles for average exposure temperature of 25°C in direct sunlight.
  • Temperature profile for stitched cover comprising of Tyvek® 1048A, 6 mm nitrile rubber closed cell insulation, and spun bond polypropylene. Vacuum insulation panels made using honey comb structures are placed as an additional protection layer after the stitched cover. These layers enclose a Styrofoam box filled with gel packs and product.
  • Fig. 9 is a data logger chart comparing temperature profiles for exposure in direct sunlight.
  • Temperature profile for stitched cover comprising of Tyvek® 1048A, 6 mm nitrile rubber closed cell insulation, and spun bond polypropylene. 8 mm vacuum insulation panels made using fumed silica are placed as an additional protection layer after the stitched cover. These layers enclose a Styrofoam box filled with gel packs and product.
  • Fig. 10 is a data logger chart comparing temperature profiles for exposure in direct sunlight.
  • Temperature profile for Styrofoam box filled with gel packs and product 3. Temperature profile for stitched cover comprising of Tyvek® 1048A, 6 mm nitrile rubber closed cell insulation, and spun bond polypropylene. 8 mm vacuum insulation panels made using fumed silica are placed as an additional protection layer after the stitched cover. These layers enclose a wooden box filled with gel packs and product.
  • Tyvek® 1048A - a flash spun non-woven high density polyethylene from E.I. DuPont de Nemours Company, Wilmington, DE.
  • Tyvek® 3563M - a breathable, metalized flash spun non-woven high density polyethylene made by the process of vapor deposition available from E.I. DuPont de Nemours Company, Wilmington, DE.
  • Air permeability of a pallet cover was measured by an ISO 5636-5 method using a Gurley 4340 apparatus.
  • the apparatus consisted of an opening for a flat- sheet sample to be inserted and clamped pneumatically. Upon clamping, a constant volume of air is passed through the test specimen at a particular applied pressure (specified by Gurley 4340 automatic densometer provided by Gurley Precision Instruments, Troy, NY, USA) and the time taken (in seconds) is displayed by the instrument to indicate the air permeability of the sample.
  • Average peak temperatures of pallets prepared in the below examples was measured using a iButton DS1921 G-F5 data logger which can record air temperature for every 10 minutes with an accuracy of ⁇ 0.5 °C .
  • Thermal resistance of layers was measured as per ASTM C518 using a Netzsch HFM 436/3 Lambda Heat Flow Meter. The sample size used was 30 cm x 30 cm with a thickness of at least 5 mm.
  • a 750 x 750 x 750 mm 3 pallet was prepared with 27 corrugated packaging boxes of 3-ply construction and enclosed with a cover of the following layers stitched together (from outside in) - Tyvek® 1048A, 6 mm nitrile rubber foam, and an inner layer of spun bonded Polypropylene (100 g/m 2 basis weight).
  • the cover showed an air permeability value of 13545 s per 100 cc of air as measured by Gurley method and had a thermal resistance of 0.209 m 2 K/W as measured using a heat flow meter at 24 °C.
  • Example 1 b (comparative example with respect to example 1 )
  • Example 1 Pallet of dimensions described in Example 1 was prepared with only Tyvek® 1048A cover. The above sample showed an air permeability value of 13.7 s per 100 cc of air as measured by Gurley method. Data loggers were placed in boxes as described in Example 1 and the pallets were placed under direct sun light.
  • Figure 4 indicates the improved performance of cover used in example 1 over Tyvek® 1048A alone.
  • the product temperatures were nearly 5 °C lower for than Tyvek® 1048A and moreover, time to reach the peak temperature was offset by at least 4 to 5 hours.
  • Example 2 A pallet of dimensions described in Example 1 was prepared with a cover of the following layers stitched together (from outside in) - Tyvek® 1048A, 6 mm nitrile rubber foam, and an inner layer of spun bonded Polypropylene (100 g/m 2 basis weight). The cover showed an air permeability value of 13545 s per 100 cc of air as measured by Gurley method. A thermal resistance of 0.209 m 2 K/W was obtained using a heat flow meter at 24 °C. The pallet was first conditioned at 20 °C for at least 6 hours, before placing it under a shaded region with no direct sun light exposure for at least 3 hours. Data loggers were placed underneath the cover on top of top row middle box and also in top row corner box with 1 .7 kgs of gel packs (> 95 wt % water) to simulate the product.
  • Example 2b (comparative example to example 2)
  • Example 1 Pallet of dimensions described in Example 1 was prepared with only Tyvek® 1048A cover.
  • the cover showed an air permeability value of 13.7 s per 100 cc of air as measured by Gurley method. Thermal resistance for this sample could not be measured using a HFM due to sample dimension limitations. However, it is expected to be negligible and near 0 m 2 K/W.
  • the pallet was first conditioned at 20 °C for at least 6 hours, before placing it under a shaded region with no direct sun light exposure for at least 3 hours.
  • Data loggers were placed underneath the cover on top of top row middle box and also in top row corner box with 1 .7 kgs of gel packs (> 95 wt % water) to simulate the product.
  • Figures 5 indicates a much slower rate of temperature change for cover used in example 2 over Tyvek® 1048A; there is not more than 5 °C change over 3 hours of exposure while Tyvek® 1048A shows higher temperature values.
  • a pallet of dimensions described in Example 1 was prepared with a cover of the following layers stitched together - Tyvek® 3563M, 9 mm nitrile rubber foam, and an inner layer of spun bonded Polypropylene (100 g/m 2 basis weight).
  • the above sample showed an air permeability value of 15000 s per 100 cc of air as measured by Gurley method.
  • a thermal resistance of 0.285 m 2 K/W was obtained using a heat flow meter at 24 °C.
  • Example 3b (comparative example to example 3)
  • Example 1 A Pallet of dimensions described in Example 1 was prepared with only Tyvek® 1048A cover. The above sample showed an air permeability value of 13.7 s per 100 cc of air as measured by Gurley method. Thermal resistance for this sample could not be measured using a HFM due to sample dimension limitations. However, it is expected to be negligible and near 0 m 2 K/W. The pallet was exposed to direct sun light for at least 100 hours and the product temperature profiles were recorded, as described in Example 3.
  • Figure 6 shows that with a cover as used in Example 3, an average of nearly 8 °C lower peak temperature and a time lag of 5 or more hours are obtained in comparison to Tyvek® 1048A alone.
  • Example 4 A 24 cm 2 sample of a super absorbent polymer (Type 142/52/10, 140 g/m2, Technical Absorbent, UK) was wet with 200 cc of water and made into a panel by completely covering it with stretch wrap. Five such panels were adhered together to create a cover (sans bottom side) for a 250 x 250 x 250 mm 3 3-ply corrugated box, over which a Tyvek® 1048A cover was placed and sealed. Data logger was placed inside the box to record temperature. The boxes were exposed to direct sun light for about 50 hours. The above sample showed an air permeability value of >50000 s per 100 cc of air as measured by Gurley method. A thermal resistance of 0.102 m 2 K W was obtained using a heat flow meter at 24 °C.
  • Example 4b (Comparative example to example 4)
  • a 250 x 250 x 250 mm 3 3-ply corrugated box was covered with Tyvek® 1048A alone and used as reference.
  • the above sample showed an air permeability value of 13.7 s per 100 cc of air as measured by Gurley method.
  • the boxes were exposed to direct sun light for about 50 hours.
  • Figure 7 shows the temperature profiles.
  • the cover described in example 4 shows a slightly lowered temperature and also with a temperature lag of at least 4 hours in comparison to Tyvek® 1048A alone.
  • Example 5
  • a panel consisting of paper skin and a paper honeycomb core of 12" width, 15 mm height, and wall thickness of 2 mm (HonecoreTM, Bangalore) was placed inside a bi-axially oriented Polypropylene pouch previously sealed on 3 sides, and a lower atmospheric pressure condition was created. After reduction of air pressure, the open side was thermally sealed without allowing air ingress. Multiples of such panels were then attached through adhesive tape to adequately fit all sides of the Styrofoam box. Over this panel, a composite cover of the following layers stitched together was laid upon the panels and Styrofoam box ('protected') -
  • Example 5b (comparative example to example 5)
  • a Styrofoam box with gel pack and product contents as described in example 5 was prepared without any protective cover.
  • the box was exposed to ambient conditions with an average temperature of 25 °C.
  • Data loggers were imbedded in the box to continuously record temperature and this data was analyzed after 100 hours of exposure.
  • Example 6b (comparative example to example 6)
  • a Styrofoam box with gel pack and product contents as described in example 6 was prepared without any protective cover.
  • the box was exposed to ambient conditions with an average temperature of 25 °C.
  • Data loggers were imbedded in the box to continuously record temperature and this data was analyzed after 100 hours of exposure.
  • Example 7b (comparative example to example 7)
  • a Styrofoam box with gel pack and product contents as described in example 6 was prepared without any protective cover.
  • the box was exposed to ambient conditions with an average temperature of 25 °C.
  • Data loggers were imbedded in the box to continuously record temperature and this data was analyzed after 100 hours of exposure.
  • a cover as described in example 7 shows lower temperature of about 2 - 5 °C in comparison to the standard method of shipment described in this example.
  • Styrofoam which is typically not considered recyclable, can therefore be avoided to still maintain a temperature condition suitable for perishable or biopharmaceutical product.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Laminated Bodies (AREA)
  • Wrappers (AREA)
  • Packages (AREA)

Abstract

L'invention concerne un couvercle de protection thermique multicouche pour le stockage et le transport de matières sensibles à la température. Le couvercle présente une surface extérieure et une surface intérieure relativement à la matière et contient des couches de telle sorte qu'une couche extérieure adjacente à la surface extérieure est une bande de filaments plexiformes, une couche intérieure adjacente à la surface intérieure est une bande non-tissée, une couche interne ou des couches situées entre les couches extérieure et intérieure contient une mousse polymère à cellules fermées, le couvercle de protection étant imperméable à l'air.
PCT/US2013/071506 2012-11-22 2013-11-22 Couvercle de protection thermique et son procédé de fabrication Ceased WO2014082014A1 (fr)

Priority Applications (1)

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US14/646,580 US20150291327A1 (en) 2012-11-22 2013-11-22 Thermally protective cover and method of manufacture thereof

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Application Number Priority Date Filing Date Title
IN3583/DEL/2012 2012-11-22
INDE35832012 2012-11-22

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JP6944013B2 (ja) 2019-11-06 2021-10-06 寧波瑞凌新能源科技有限公司Ｎｉｎｇｂｏ Ｒａｄｉ−Ｃｏｏｌ Ａｄｖａｎｃｅｄ Ｅｎｅｒｇｙ Ｔｅｃｈｎｏｌｏｇｉｅｓ Ｃｏ．， Ｌｔｄ． 放射冷却生地及び製品

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