US20040137816A1 - Material for protecting articles having a nonwoven fabric bonded to a shrink film by an adhesive applied in a predetermined pattern - Google Patents
Material for protecting articles having a nonwoven fabric bonded to a shrink film by an adhesive applied in a predetermined pattern Download PDFInfo
- Publication number
- US20040137816A1 US20040137816A1 US10/725,644 US72564403A US2004137816A1 US 20040137816 A1 US20040137816 A1 US 20040137816A1 US 72564403 A US72564403 A US 72564403A US 2004137816 A1 US2004137816 A1 US 2004137816A1
- Authority
- US
- United States
- Prior art keywords
- adhesive
- film
- nonwoven fabric
- wrap material
- shrink wrap
- 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.)
- Abandoned
Links
- 239000000463 material Substances 0.000 title claims abstract description 83
- 239000000853 adhesive Substances 0.000 title claims abstract description 81
- 230000001070 adhesive effect Effects 0.000 title claims abstract description 81
- 239000004745 nonwoven fabric Substances 0.000 title claims abstract description 75
- 229920006300 shrink film Polymers 0.000 title 1
- 238000000034 method Methods 0.000 claims description 15
- 238000004519 manufacturing process Methods 0.000 claims description 14
- 229920001169 thermoplastic Polymers 0.000 claims description 14
- 239000004416 thermosoftening plastic Substances 0.000 claims description 14
- 239000004831 Hot glue Substances 0.000 claims description 8
- 229910003460 diamond Inorganic materials 0.000 claims description 4
- 239000010432 diamond Substances 0.000 claims description 4
- 239000000835 fiber Substances 0.000 claims description 4
- 230000004044 response Effects 0.000 claims description 4
- 229920006257 Heat-shrinkable film Polymers 0.000 claims 1
- 238000005299 abrasion Methods 0.000 claims 1
- 230000008878 coupling Effects 0.000 claims 1
- 238000010168 coupling process Methods 0.000 claims 1
- 238000005859 coupling reaction Methods 0.000 claims 1
- 238000003825 pressing Methods 0.000 claims 1
- 239000011800 void material Substances 0.000 claims 1
- 230000001681 protective effect Effects 0.000 abstract description 3
- 239000006096 absorbing agent Substances 0.000 abstract description 2
- 230000035939 shock Effects 0.000 abstract description 2
- VSKJLJHPAFKHBX-UHFFFAOYSA-N 2-methylbuta-1,3-diene;styrene Chemical compound CC(=C)C=C.C=CC1=CC=CC=C1.C=CC1=CC=CC=C1 VSKJLJHPAFKHBX-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 229920000728 polyester Polymers 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- XOJVVFBFDXDTEG-UHFFFAOYSA-N Norphytane Natural products CC(C)CCCC(C)CCCC(C)CCCC(C)C XOJVVFBFDXDTEG-UHFFFAOYSA-N 0.000 description 1
- 229920002302 Nylon 6,6 Polymers 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 229920001131 Pulp (paper) Polymers 0.000 description 1
- 239000004772 Sontara Substances 0.000 description 1
- 238000003916 acid precipitation Methods 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 229920000092 linear low density polyethylene Polymers 0.000 description 1
- 239000004707 linear low-density polyethylene Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229920001684 low density polyethylene Polymers 0.000 description 1
- 239000004702 low-density polyethylene Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000000059 patterning Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- -1 polypropylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 229920006302 stretch film Polymers 0.000 description 1
Images
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
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/14—Layered products comprising a layer of synthetic resin next to a particulate layer
-
- 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
- B65D81/02—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 specially adapted to protect contents from mechanical damage
- B65D81/03—Wrappers or envelopes with shock-absorbing properties, e.g. bubble films
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
- Y10T428/1328—Shrinkable or shrunk [e.g., due to heat, solvent, volatile agent, restraint removal, etc.]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24802—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
- Y10T428/2481—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.] including layer of mechanically interengaged strands, strand-portions or strand-like strips
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24802—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
- Y10T428/24826—Spot bonds connect components
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
- Y10T442/20—Coated or impregnated woven, knit, or nonwoven fabric which is not [a] associated with another preformed layer or fiber layer or, [b] with respect to woven and knit, characterized, respectively, by a particular or differential weave or knit, wherein the coating or impregnation is neither a foamed material nor a free metal or alloy layer
- Y10T442/2738—Coating or impregnation intended to function as an adhesive to solid surfaces subsequently associated therewith
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
- Y10T442/60—Nonwoven fabric [i.e., nonwoven strand or fiber material]
- Y10T442/674—Nonwoven fabric with a preformed polymeric film or sheet
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
- Y10T442/60—Nonwoven fabric [i.e., nonwoven strand or fiber material]
- Y10T442/689—Hydroentangled nonwoven fabric
Definitions
- This invention relates to a material for protecting articles during transport and storage, a method of manufacturing the material, and a method of using the material to protect articles.
- U.S. Pat. No. 5,491,017 damage may be caused by a number of factors, including acid rain and hurled objects, such a small rocks and stones.
- the wrap material disclosed in U.S. Pat. No. 5,491,017 includes a nonwoven fabric intermittently bonded to a shrinkable and stretchable film that has a pre-determined shrink response as heat is applied thereto. The material is formed into a bag which is placed over the object be protected. The bag is then shrunk around the object with the nonwoven fabric engaging the surface of the object and supporting the film off of the surface of the object.
- the present invention relates to an improved material and methods for its manufacture.
- An adhesive is applied to a contoured gravure roll whereby when rotated across a first material of nonwoven fabric or thermoplastic film, an adhesive is applied in a pre-determined pattern.
- the adhesive generally covers from about 4.0 to about 33.0% of the nonwoven fabric or thermoplastic film to which it is applied.
- the other of the nonwoven fabric or thermoplastic film is then adhered to the material bearing the adhesive by bringing the non-adhesive bearing material into contact with the adhesive bearing material with a limited amount of pressure.
- the nonwoven fabric separates from the film in the areas between the bonds to provide raised portions, thereby protecting the surface of the article from contact with the bonded portion of the nonwoven fabric.
- FIG. 1 is a schematic illustration of a first method of manufacturing the material of the present invention
- FIG. 2 is a plan view of the gravure roll used to apply the adhesive to the film in the manufacture of the material according to the present invention
- FIG. 3 is a fragmentary view in perspective of the material made using the gravure roll illustrated in FIG. 2 with the film layer peeled away from the nonwoven fabric;
- FIG. 4 is a fragmentary view in perspective of the material illustrated in FIG. 3 after the material has been shrunk;
- FIG. 5 is a view similar to FIG. 2, but illustrating another embodiment of the gravure roll used to apply adhesive to the film;
- FIG. 6 is an enlarged view of the circumscribed portion of FIG. 5;
- FIG. 7 is a view similar to FIG. 4, but illustrating the material made using the gravure roll illustrated in FIG. 5;
- FIG. 8 is an enlarged cross-sectional view of the material illustrated in FIG. 4, but with the material displaced from the surface protected by the material;
- FIG. 9 is a view similar to FIG. 8, but with the nonwoven fabric of the present material engaged with the surface being protected;
- FIG. 10 is a schematic illustration of a second method of manufacturing the material of the present invention.
- FIG. 11 is a perspective view of an automotive vehicle to be protected by the wrap material of the present invention.
- FIG. 12 is a perspective view of a motorcycle to be protected by the wrap material of the present invention.
- FIG. 13 is a schematic illustrating one manner of applying the material manufactured according to the processes illustrated in FIGS. 1 and 10 to an automotive vehicle.
- a shrinkable, protective material made according to the present invention is generally indicated by the numeral 10 .
- Protective material 10 includes a layer 12 of a shrinkable film and a layer 14 of a nonwoven fabric, preferably a hydro-entangled nonwoven fabric.
- shrinkable, stretchable film it is meant that the thermoplastic film retains a predetermined level of post shrink elasticity and a relatively low post shrink modulus after heating.
- These so called shrinkable, stretchable films are available from Wright Plastics Corporation, Prattville, Ala. and sold as film TS-5 or a film sold as film C-40 by, Crayex Corporation, Piqua, Ohio.
- the nonwoven fabric can be made out of fibers such as polyester, nylon 6,6, or a combination of wood pulp and staple polyester fibers.
- a commercially available hydro-entangled nonwoven fabric useful in accordance with the teachings of the present invention is Sontara, available from DuPont, Inc.
- the film and nonwoven fabric are secured to one another by an adhesive which is placed on the film according to the method depicted in FIG. 1 or the nonwoven according to the method depicted in FIG. 10 as will hereinafter be described in a predetermined pattern generally indicated by the numeral 16 (FIG. 3). Accordingly, areas 18 are defined on the film or the nonwoven that are free of the adhesive between the areas covered by the adhesive pattern 14 .
- the adhesive may be any on of a number of commonly available hot melt adhesives such as an S-I-S (styrene-isoprene-styrene), S-E-S (styrene-ethylene-styrene) type adhesive which are available from ATO Corp. of Findley, Ohio and H.B.
- Non-pressure sensitive hot melt adhesives are also useful.
- polypropylene based hot melt adhesives such as #9058-35 and #9058-70 available from Tivoli of Hamburg, Germany and #4315 LLDPE, available from Bostik Corp. are examples of useful non-pressure sensitive hot melt adhesives.
- the adhesive generally need only cover between about 4.0 to about 33.0% of the nonwoven fabric or film to which it is applied.
- no adhesive bonding occurs along at least about 67.0% of the interface between the nonwoven material and thermoplastic film. Accordingly, the bonded areas 20 of the material are much smaller than the unbonded areas 22 .
- a roll 24 of the film 12 is provided, and the film 12 is fed off of the roll 24 and is carried into engagement with the outer circumferential surface 26 of a rotating contoured gravure roll generally indicated by the numeral 28 .
- the gravure roll 28 is available from Karl Wenk GmbH, Lorrach Brombach, Germany.
- the film is held against the outer surface 26 of the gravure roll 28 by idler rollers 30 , 32 .
- the gravure roll applies adhesive to the film in the pre-determined pattern 16 .
- the film 12 with the adhesive applied thereto, is then fed through a set of rollers 34 , through which the nonwoven fabric 14 is also fed after being pulled from a roll 36 so that the film 12 and nonwoven fabric 14 are brought into substantially parallel alignment with one another.
- the film and nonwoven are then carried through a conventional bonding station 38 .
- the bonding station 38 is adjusted to provide light pressure to the film 12 and nonwoven fabric 14 to cause the film and nonwoven fabric to be bonded only in those areas in which adhesive has been applied to the film.
- the material 10 is wound on a take up roll 40 .
- the bonding station 38 and the supports for the various rolls of material are a part of a conventional laminating machine available from Cavitec AG, Munchwilen, Switzerland.
- the outer circumferential surface 26 of the gravure roll 28 is provided with a first set of substantially parallel grooves 42 and a second set of substantially parallel grooves 44 which extend obliquely, i.e., perpendicularly with respect to the first set of grooves to define diamond-shaped areas 46 on the surface 26 .
- the grooves 42 , 44 define lower portions of the surface 26 and the areas 46 define the outer circumferential surface 26 .
- the adhesive is maintained in molten form in a conventional adhesive dispenser generally indicated at 48 .
- Dispenser 48 includes a receptacle 50 in which the adhesive is maintained in the molten state and a roller 52 that extends parallel to the outer circumferential surface 26 and applies adhesive from the receptacle 50 on the entire surface 26 , including both the grooves 42 , 44 and the areas 46 .
- the adhesive is sufficiently liquid that it readily fills the grooves 42 , 44 .
- the roll 26 after the adhesive is applied to the outer circumferential surface 28 , is rotated past a conventional doctor blade 54 that scrapes the adhesive off of the areas 46 , thereby leaving adhesive only in the grooves 42 , 44 , so that adhesive is deposited on the film 12 in a substantially diamond shaped pattern 16 .
- Other linear and non-linear, generally parallel adhesive patterns such as a hexagonal pattern, while not specifically illustrated, are contemplated and should theoretically give rise to the so-called pillows described in greater detail below.
- the nonwoven fabric 14 is bonded to the film 12 in the areas where adhesive has been applied to the film as defined by the pattern 16 .
- the portions of the nonwoven fabric 14 which are not bonded to the film 12 overlay and engage the areas 18 of the film which are free of adhesive.
- the portions of the nonwoven fabric 14 overlying the areas 18 which are unbonded gathers up to form soft, curved raised portions or pillows 56 , which act as shock absorbers and have no square corners that might cut or abrade.
- FIGS. 8 and 9 the surface of the article being protected is indicated by the numeral 58 .
- the pillows 56 define edge portions 60 which face one another and define the portions of the nonwoven fabric that are secured to the film 12 via the bonds 20 .
- the nonwoven fabric engages the surface and the edge portions 60 of the film are deflected by contact of the pillows 56 with the surface 58 such that the portions 60 cover the bonds 20 , thus preventing contact between the bonds 20 and the surface 58 .
- the bonds 20 tend to be more abrasive than the film itself and as such, it is important that the bonds 20 are precluded from coming into contact with the surface 58 . Accordingly, the deflectable edge portions 60 prevent such contact, assuring that the surface 58 will be protected from the abrasive bonds 20 .
- the cushioning effect of the nonwoven fabric also protects the surface 58 against damage by small hurled objects, such as stones, that may occur during transport.
- the material is essentially not capable of being stretched around curves or corners of the object 58 in such a manner that the nonwoven will be drawn down to the extent that the film comes in direct contact with the object 58 .
- the pillows 56 generally have an increasing average height dimension (from base to pinnacle prior to being applied over a surface) as the shrink rate of the film in both the machine and cross-machine directions increase.
- the average pillow height will increase to approximately 140 mils at a 10% shrink rate.
- the average pillow height is approximately 210 mils and at a 35% shrink rate, the average pillow height is approximately 380 mils.
- the pillow height increases at least about two times (2 ⁇ ) prior to application over a surface.
- shrink rate it is meant the amount of shrinkage occurring, not the speed at which shrinkage occurs.
- the invention is not limited to any particular pattern 16 of applying adhesive to the film 12 .
- the outer circumferential surface 26 of the gravure roll may be provided with a single set of parallel grooves 62 that extend circumferentially around the roller 26 .
- a pattern of adhesive is deposited on the film 12 consisting of parallel lines.
- the bonds 64 between the film 12 and nonwoven 14 are also elongated strips and the pillows 56 formed after shrinking extend the entire length of the material.
- one advantage of applying the adhesive in a distinct pattern is that the tear strength of the film is increased.
- FIGS. 5 - 7 does not have the crossing lines of adhesive as does the embodiment of FIGS. 2 - 4 , the tear strength will be less, but less adhesive will also be used and because the nonwoven fabric is less restrained by the bonds, the nonwoven will more readily gather up and deflect.
- a roll 36 of nonwoven fabric 14 is provided, and the nonwoven fabric is fed off of the roll 36 and is carried into relative proximity with the outer circumferential surface 26 of a rotating contoured gravure roll generally indicated by the numeral 28 .
- the nonwoven fabric is held in relative proximity to the outer surface 26 of the gravure roll 28 by idler rollers 30 , 32 .
- the gravure roll applies adhesive to the nonwoven fabric in the pre-determined pattern 16 .
- the nonwoven fabric 14 with the adhesive applied thereto, is then fed through a set of rollers 34 , through which the shrinkable thermoplastic film 12 is also fed after being pulled from a roll 36 so that the film 12 and nonwoven fabric 14 are brought into substantially parallel alignment with one another.
- the film and nonwoven are then carried through a conventional bonding station 38 .
- the bonding station 38 is adjusted to provide light pressure to the film 12 and nonwoven fabric 14 to cause the film and nonwoven fabric to be bonded only in those areas in which adhesive has been applied to the nonwoven fabric.
- the material 10 is wound on a take up roll 40 .
- the nonwoven material is held slightly away from the gravure roll 28 as the adhesive is being applied.
- the adhesive should be maintained along the raised portions of the nonwoven film as opposed to significantly entering the interstitial openings in the nonwoven fabric.
- the nip pressure is preferably maintained at a rate of between about 1.0 to about 9.0 lbs. of pressure per lineal inch (lb/pli) depending on the nonwoven fabric, thermoplastic film and adhesive employed as well as the rates at which the materials are fed through the manufacturing equipment.
- lb/pli pressure per lineal inch
- Nip pressures below about 1.0 lb/pli tend not to effectively join the materials and nip pressures above about 9.0 lb/pli cause the adhesive to be pressed into the interstitial openings of the nonwoven fabric which is undesirable.
- the nip pressure is set and constantly monitored to ensure that the adhesive remains along the raised portions of the nonwoven fabric to a very high degree.
- the wrap material of the present invention is particularly useful in the transportation of articles of manufacture such as automobiles and motorcycles, by way of non-limiting example.
- rolls 40 of the material are unwound as demonstrated in FIG. 13 and an appropriate amount is cut off.
- the edges of the material are then sealed to form a bag in which the nonwoven material is on the inside and the film is on the outside.
- Heat is then applied to the bag causing the film to shrink and the nonwoven material to form pillows or cushions as described in detail above.
- heat can be applied by any conventional means such as through the use of heat tunnels 70 including fixed or slidable heating elements 72 for high volume production or by the use of hand held blowers for manual applications.
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- Engineering & Computer Science (AREA)
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Abstract
A shrinkable protective material includes a nonwoven fabric bonded to a shrinkable film by an adhesive that is applied to either the nonwoven fabric or the shrinkable film in a pre-determined pattern. Upon shrinking, the nonwoven fabric separates or releases from the film and forms cushions or pillows holding the film off of the surface being protected. The edge portions of the cushions or pillows act as shock absorbers and deflect over the bonds, thus protecting the surface against the abrasive adhesively bonded portions.
Description
- This application is a divisional of U.S. Ser. No. 10/079,642 which is a continuation-in part of U.S. Ser. No. 09/664,896 now issued as U.S. Pat. No. 6,562,740 B1.
- This invention relates to a material for protecting articles during transport and storage, a method of manufacturing the material, and a method of using the material to protect articles.
- Large articles, such as automobiles, machinery and boats must often be transported from the factory to the ultimate consumer on open trucks where they are exposed to the environment. Consumers expect that new automobiles, boats and machinery to be in pristine condition, and will not tolerate defects. As discussed in prior U.S. Pat. No. 5,491,017, damage may be caused by a number of factors, including acid rain and hurled objects, such a small rocks and stones. The wrap material disclosed in U.S. Pat. No. 5,491,017 includes a nonwoven fabric intermittently bonded to a shrinkable and stretchable film that has a pre-determined shrink response as heat is applied thereto. The material is formed into a bag which is placed over the object be protected. The bag is then shrunk around the object with the nonwoven fabric engaging the surface of the object and supporting the film off of the surface of the object.
- The present invention relates to an improved material and methods for its manufacture. An adhesive is applied to a contoured gravure roll whereby when rotated across a first material of nonwoven fabric or thermoplastic film, an adhesive is applied in a pre-determined pattern. The adhesive generally covers from about 4.0 to about 33.0% of the nonwoven fabric or thermoplastic film to which it is applied. The other of the nonwoven fabric or thermoplastic film is then adhered to the material bearing the adhesive by bringing the non-adhesive bearing material into contact with the adhesive bearing material with a limited amount of pressure. When the film is shrunk, the nonwoven fabric separates from the film in the areas between the bonds to provide raised portions, thereby protecting the surface of the article from contact with the bonded portion of the nonwoven fabric.
- Often, it is desirable to prevent contact between the bonded portions of the nonwoven fabric and the surface because the cured adhesive occurring along the bonded portion of the fabric is abrasive, as is the film, and any contact by either the film or the adhesive with the surface can cause damage. By protecting the surface of the object from the adhesive bonds, damage caused by rubbing of the bonded portion of the nonwoven fabric across the surface being protected, which occurs for example during handling of the object during transport storage, is prevented. The repeating nature of the pattern of adhesive also facilitates manufacture and strengthens and adds tear resistance to the material.
- These and other advantages of the present invention will become apparent from the following description, with reference to the accompanying drawings, in which:
- FIG. 1 is a schematic illustration of a first method of manufacturing the material of the present invention;
- FIG. 2 is a plan view of the gravure roll used to apply the adhesive to the film in the manufacture of the material according to the present invention;
- FIG. 3 is a fragmentary view in perspective of the material made using the gravure roll illustrated in FIG. 2 with the film layer peeled away from the nonwoven fabric;
- FIG. 4 is a fragmentary view in perspective of the material illustrated in FIG. 3 after the material has been shrunk;
- FIG. 5 is a view similar to FIG. 2, but illustrating another embodiment of the gravure roll used to apply adhesive to the film;
- FIG. 6 is an enlarged view of the circumscribed portion of FIG. 5;
- FIG. 7 is a view similar to FIG. 4, but illustrating the material made using the gravure roll illustrated in FIG. 5;
- FIG. 8 is an enlarged cross-sectional view of the material illustrated in FIG. 4, but with the material displaced from the surface protected by the material;
- FIG. 9 is a view similar to FIG. 8, but with the nonwoven fabric of the present material engaged with the surface being protected;
- FIG. 10 is a schematic illustration of a second method of manufacturing the material of the present invention;
- FIG. 11 is a perspective view of an automotive vehicle to be protected by the wrap material of the present invention;
- FIG. 12 is a perspective view of a motorcycle to be protected by the wrap material of the present invention; and
- FIG. 13 is a schematic illustrating one manner of applying the material manufactured according to the processes illustrated in FIGS. 1 and 10 to an automotive vehicle.
- Referring now to the figures, a shrinkable, protective material made according to the present invention is generally indicated by the
numeral 10.Protective material 10 includes alayer 12 of a shrinkable film and alayer 14 of a nonwoven fabric, preferably a hydro-entangled nonwoven fabric. By the phrase “shrinkable, stretchable film”, it is meant that the thermoplastic film retains a predetermined level of post shrink elasticity and a relatively low post shrink modulus after heating. These so called shrinkable, stretchable films are available from Wright Plastics Corporation, Prattville, Ala. and sold as film TS-5 or a film sold as film C-40 by, Crayex Corporation, Piqua, Ohio. The nonwoven fabric can be made out of fibers such as polyester, nylon 6,6, or a combination of wood pulp and staple polyester fibers. A commercially available hydro-entangled nonwoven fabric useful in accordance with the teachings of the present invention is Sontara, available from DuPont, Inc. - The film and nonwoven fabric are secured to one another by an adhesive which is placed on the film according to the method depicted in FIG. 1 or the nonwoven according to the method depicted in FIG. 10 as will hereinafter be described in a predetermined pattern generally indicated by the numeral16 (FIG. 3). Accordingly,
areas 18 are defined on the film or the nonwoven that are free of the adhesive between the areas covered by theadhesive pattern 14. The adhesive may be any on of a number of commonly available hot melt adhesives such as an S-I-S (styrene-isoprene-styrene), S-E-S (styrene-ethylene-styrene) type adhesive which are available from ATO Corp. of Findley, Ohio and H.B. Fuller Corp. of Minneapolis, Minn. Yet another useful adhesive is #9016 LDPE available from the Bostik Corp. of Middleton, Me. While the above described hot melt adhesives are commonly known as a “pressure sensitive” hot melt adhesives, non-pressure sensitive hot melt adhesives are also useful. For example and without limitation, polypropylene based hot melt adhesives such as #9058-35 and #9058-70 available from Tivoli of Hamburg, Germany and #4315 LLDPE, available from Bostik Corp. are examples of useful non-pressure sensitive hot melt adhesives. During manufacture, the nonwoven fabric and film are lightly pressed against one another to cause the adhesive to bond the film and nonwoven fabric together. As a result of the patterning of the adhesive, the adhesive generally need only cover between about 4.0 to about 33.0% of the nonwoven fabric or film to which it is applied. Thus, no adhesive bonding occurs along at least about 67.0% of the interface between the nonwoven material and thermoplastic film. Accordingly, thebonded areas 20 of the material are much smaller than theunbonded areas 22. - Referring specifically now to FIG. 1, a first method of manufacturing the
material 10 will now be described. Aroll 24 of thefilm 12 is provided, and thefilm 12 is fed off of theroll 24 and is carried into engagement with the outercircumferential surface 26 of a rotating contoured gravure roll generally indicated by thenumeral 28. Thegravure roll 28 is available from Karl Wenk GmbH, Lorrach Brombach, Germany. The film is held against theouter surface 26 of thegravure roll 28 byidler rollers film 12, with the adhesive applied thereto, is then fed through a set ofrollers 34, through which thenonwoven fabric 14 is also fed after being pulled from aroll 36 so that thefilm 12 andnonwoven fabric 14 are brought into substantially parallel alignment with one another. The film and nonwoven are then carried through aconventional bonding station 38. Thebonding station 38 is adjusted to provide light pressure to thefilm 12 andnonwoven fabric 14 to cause the film and nonwoven fabric to be bonded only in those areas in which adhesive has been applied to the film. Thematerial 10 is wound on a take uproll 40. Thebonding station 38 and the supports for the various rolls of material are a part of a conventional laminating machine available from Cavitec AG, Munchwilen, Switzerland. - According to a first embodiment, the outer
circumferential surface 26 of thegravure roll 28 is provided with a first set of substantiallyparallel grooves 42 and a second set of substantiallyparallel grooves 44 which extend obliquely, i.e., perpendicularly with respect to the first set of grooves to define diamond-shapedareas 46 on thesurface 26. Thegrooves surface 26 and theareas 46 define the outercircumferential surface 26. The adhesive is maintained in molten form in a conventional adhesive dispenser generally indicated at 48. -
Dispenser 48 includes areceptacle 50 in which the adhesive is maintained in the molten state and aroller 52 that extends parallel to the outercircumferential surface 26 and applies adhesive from thereceptacle 50 on theentire surface 26, including both thegrooves areas 46. The adhesive is sufficiently liquid that it readily fills thegrooves roll 26, after the adhesive is applied to the outercircumferential surface 28, is rotated past a conventional doctor blade 54 that scrapes the adhesive off of theareas 46, thereby leaving adhesive only in thegrooves film 12 in a substantially diamond shaped pattern 16. Other linear and non-linear, generally parallel adhesive patterns such as a hexagonal pattern, while not specifically illustrated, are contemplated and should theoretically give rise to the so-called pillows described in greater detail below. - As illustrated in FIG. 3, before the
material 10 is shrunk by applying heat thereto in a manner well known to those skilled in the art, thenonwoven fabric 14 is bonded to thefilm 12 in the areas where adhesive has been applied to the film as defined by the pattern 16. The portions of thenonwoven fabric 14 which are not bonded to thefilm 12 overlay and engage theareas 18 of the film which are free of adhesive. However, after thematerial 10 is shrunk, as indicated in FIG. 4, since thefilm 12 shrinks and thenonwoven fabric 14 does not shrink in any appreciable amount, the portions of thenonwoven fabric 14 overlying theareas 18 which are unbonded gathers up to form soft, curved raised portions orpillows 56, which act as shock absorbers and have no square corners that might cut or abrade. Thesepillows 56 engage the surface of the article being protected (not shown in FIG. 4), thus forming a cushion supporting the film off of the surface of the article being protected. This is more clearly illustrated in FIGS. 8 and 9, in which the surface of the article being protected is indicated by the numeral 58. In FIG. 8, in which thematerial 10 is illustrated as being displaced from thesurface 58, even though thematerial 10 has been shrunk, thepillows 56 defineedge portions 60 which face one another and define the portions of the nonwoven fabric that are secured to thefilm 12 via thebonds 20. However, when thematerial 10 is used to protect thesurface 58, the nonwoven fabric engages the surface and theedge portions 60 of the film are deflected by contact of thepillows 56 with thesurface 58 such that theportions 60 cover thebonds 20, thus preventing contact between thebonds 20 and thesurface 58. Thebonds 20 tend to be more abrasive than the film itself and as such, it is important that thebonds 20 are precluded from coming into contact with thesurface 58. Accordingly, thedeflectable edge portions 60 prevent such contact, assuring that thesurface 58 will be protected from theabrasive bonds 20. The cushioning effect of the nonwoven fabric also protects thesurface 58 against damage by small hurled objects, such as stones, that may occur during transport. Because the nonwoven fabric and film are secured to each other at regular intervals, the material is essentially not capable of being stretched around curves or corners of theobject 58 in such a manner that the nonwoven will be drawn down to the extent that the film comes in direct contact with theobject 58. - The
pillows 56 generally have an increasing average height dimension (from base to pinnacle prior to being applied over a surface) as the shrink rate of the film in both the machine and cross-machine directions increase. For example and without limitation, for a material having a shrink stretch film with an average thickness of about 5 mils and a nonwoven fabric layer having an average thickness of about 14 mils, the average pillow height will increase to approximately 140 mils at a 10% shrink rate. At a 20% shrink rate, the average pillow height is approximately 210 mils and at a 35% shrink rate, the average pillow height is approximately 380 mils. Thus, for each 10% increase in the shrink rate, the pillow height increases at least about two times (2×) prior to application over a surface. By the phrase “shrink rate”, it is meant the amount of shrinkage occurring, not the speed at which shrinkage occurs. - While a substantially diamond shaped pattern has been discussed above as a preferred pattern, it should be understood that the invention is not limited to any particular pattern16 of applying adhesive to the
film 12. For example, and referring to the alternate embodiment of FIGS. 5-7, the outercircumferential surface 26 of the gravure roll may be provided with a single set ofparallel grooves 62 that extend circumferentially around theroller 26. Accordingly a pattern of adhesive is deposited on thefilm 12 consisting of parallel lines. Referring to FIG. 7, thebonds 64 between thefilm 12 andnonwoven 14 are also elongated strips and thepillows 56 formed after shrinking extend the entire length of the material. As discussed above, one advantage of applying the adhesive in a distinct pattern is that the tear strength of the film is increased. Because the embodiment of FIGS. 5-7 does not have the crossing lines of adhesive as does the embodiment of FIGS. 2-4, the tear strength will be less, but less adhesive will also be used and because the nonwoven fabric is less restrained by the bonds, the nonwoven will more readily gather up and deflect. - Referring now to FIG. 10, a second method of manufacturing the
material 10 will now be described. Aroll 36 ofnonwoven fabric 14 is provided, and the nonwoven fabric is fed off of theroll 36 and is carried into relative proximity with the outercircumferential surface 26 of a rotating contoured gravure roll generally indicated by the numeral 28. The nonwoven fabric is held in relative proximity to theouter surface 26 of thegravure roll 28 byidler rollers nonwoven fabric 14, with the adhesive applied thereto, is then fed through a set ofrollers 34, through which theshrinkable thermoplastic film 12 is also fed after being pulled from aroll 36 so that thefilm 12 andnonwoven fabric 14 are brought into substantially parallel alignment with one another. The film and nonwoven are then carried through aconventional bonding station 38. Thebonding station 38 is adjusted to provide light pressure to thefilm 12 andnonwoven fabric 14 to cause the film and nonwoven fabric to be bonded only in those areas in which adhesive has been applied to the nonwoven fabric. Thematerial 10 is wound on a take uproll 40. Thus, as should be understood by those skilled in the art, generally the same equipment can be used in the methods depicted in FIGS. 1 and 10, respectively. Certain key differences in carrying out the method depicted in FIG. 10 will now be described. - To ensure that adhesive remain essentially along the raised portions of the nonwoven material, the nonwoven material is held slightly away from the
gravure roll 28 as the adhesive is being applied. By holding the nonwoven film away from the surface of the gravure roll by at least about {fraction (1/1000)} of an inch up to about {fraction (50/1000)} of an inch, the adhesive should be maintained along the raised portions of the nonwoven film as opposed to significantly entering the interstitial openings in the nonwoven fabric. - Likewise, to ensure that the thermoplastic film is adjoined to the nonwoven fabric with slight or limited pressure, the nip pressure is preferably maintained at a rate of between about 1.0 to about 9.0 lbs. of pressure per lineal inch (lb/pli) depending on the nonwoven fabric, thermoplastic film and adhesive employed as well as the rates at which the materials are fed through the manufacturing equipment. Nip pressures below about 1.0 lb/pli tend not to effectively join the materials and nip pressures above about 9.0 lb/pli cause the adhesive to be pressed into the interstitial openings of the nonwoven fabric which is undesirable. Thus, the nip pressure is set and constantly monitored to ensure that the adhesive remains along the raised portions of the nonwoven fabric to a very high degree.
- As illustrated in FIGS. 11 and 12, the wrap material of the present invention is particularly useful in the transportation of articles of manufacture such as automobiles and motorcycles, by way of non-limiting example. To utilize the wrap material of the present invention, rolls40 of the material are unwound as demonstrated in FIG. 13 and an appropriate amount is cut off. The edges of the material are then sealed to form a bag in which the nonwoven material is on the inside and the film is on the outside. Heat is then applied to the bag causing the film to shrink and the nonwoven material to form pillows or cushions as described in detail above. It should be noted that heat can be applied by any conventional means such as through the use of
heat tunnels 70 including fixed orslidable heating elements 72 for high volume production or by the use of hand held blowers for manual applications. - While it will be apparent that the preferred embodiments of the invention disclosed are well calculated to fulfill the objects stated, it will be appreciated that the invention is susceptible to modification, variation and change without departing from the spirit thereof.
- Further, most applications of the material will require that the
layer 12 of a shrinkable, stretchable film beyond bonded to substantially the entire area of nonwoven fabric, it is fully contemplated area specific bonding embodiments are well within the scope of the present invention.
Claims (31)
1. Shrink wrap material for protecting an object comprising a nonwoven fabric layer for engaging said object when the material is applied to said object, a heat shrinkable thermoplastic film layer having a pre-determined shrink response when heat is applied thereto and an adhesive applied to at least one of said nonwoven fabric layer or thermoplastic film in a predetermined pattern defining first areas bearing said adhesive and second areas being void of said adhesive, said nonwoven layer being intermittently bonded to said film by said adhesive, said nonwoven fabric including unbonded portions that overlie the second areas of the film, thereby protecting said surface from said bonded portions.
2. Shrink wrap material as claimed in claim 1 , wherein said predetermined pattern defining said first area includes parallel lines.
3. Shrink wrap material as claimed in claim 1 , wherein said predetermined pattern of adhesive defining said first areas include a first set of parallel lines and a second set of parallel lines crossing said first set of parallel lines.
4. Shrink wrap material as claimed in claim 3 , wherein said patterned adhesive is substantially diamond shaped.
5. Shrink wrap material as claimed in claim 1 , wherein said unbonded overlying portions of the nonwoven fabric include pillows having portions which extend over said bonded portions.
6. Shrink wrap material as claimed in claim 5 , wherein said unbonded portions of the nonwoven fabric separates from said film upon shrinking of the film.
7. Shrink wrap material as claimed in claim 5 , wherein said pillows have an increasing average height dimension from base to pinnacle prior to application over a surface as the shrink rate of said film increases.
8. Shrink wrap material as claimed in claim 7 , wherein said average height dimension of said pillows increases by a factor of at least about two times for each 10% increase in the shrink rate of said film.
9. Shrink wrap material as claimed in claim 1 , wherein said adhesive covers between about 4.0 to about 33.0% of said nonwoven fabric layer or shrinkable thermoplastic film to which it is applied.
10. Shrink wrap material as claimed in claim 9 , wherein said adhesive is selected from the group consisting of pressure sensitive and non-pressure sensitive hot melt adhesives.
11. Shrink wrap material as claimed in claim 1 , wherein said thermoplastic film is a shrinkable stretchable thermoplastic film.
12. Shrink wrap material as claimed in claim 1 , wherein said nonwoven fabric is in the form of hydroentagled fibers.
13. Shrink wrap material as claimed in claim 1 , wherein said adhesive is applied to said nonwoven.
14. A method of manufacturing a material for protecting surfaces comprising the steps of providing a shrinkable film having a pre-determined shrink response when heat is applied thereto and a nonwoven fabric, applying an adhesive using a gravure roll to at least one of said film or nonwoven fabric in a predetermined pattern defining first areas bearing said adhesive in said pattern and second areas substantially larger than the first areas extending between the pattern of said first areas bearing said adhesive, and adhering the nonwoven fabric and film together by said adhesive.
15. The method as claimed in claim 14 , wherein said adhesive is a hot melt adhesive and said nonwoven fabric is adhered to said film by pressing the film and nonwoven fabric together with limited pressure.
16. The method as claimed in claim 14 , wherein said adhesive is applied to said gravure roll by rotating said roll past an adhesive dispensing station extending across the outer circumferential surface of the roll, said adhesive dispensing station applying adhesive to the first and second portions of the roll, and then rotating the roll past a doctor blade extending across the outer circumferential surface, said doctor blade removing adhesive from the raised portions of the roll while permitting adhesive to remain in the lowered portions of the roll, and then rotating said roll to apply the adhesive to one of said fiber or nonwoven fabric.
17. The method as claimed in claim 16 , wherein said adhesive is applied to said nonwoven fabric.
18. The method as claimed in claim 16 , wherein said shrinkable film and said nonwoven fabric are intermittently bonded.
19. The method as claimed in claim 16 , wherein said thermoplastic film is a shrinkable stretchable film.
20. An article of manufacture produced by the method of claim 14 .
21. Shrink wrap material for protecting an object comprising: a heat shrinkable film outer layer having a pre-determined shrink response when heat is applied thereto, a nonwoven fabric inner layer for engaging said object when said material is shrunk around said object, and a patterned adhesive intermittently applied to said nonwoven layer by a gravure roll and disposed between said film outer layer and said nonwoven fabric inner layer thereby coupling said film outer layer to said nonwoven fabric inner layer to form bonded areas and unbonded areas whereby, upon the application of heat to said material, the nonwoven fabric occurring along said unbonded areas overlie the adhesive occurring along said bonded areas thereby protecting the object from the bonded areas.
22. Shrink wrap material as claimed in claim 21 , wherein said patterned adhesive includes substantially parallel lines.
23. Shrink wrap material as claimed in claim 21 , wherein said patterned adhesive includes a first set of substantially parallel lines and a second set of perpendicular to said first set of parallel lines.
24. Shrink wrap material as claimed in claim 23 , wherein said patterned adhesive is substantially diamond shaped.
25. Shrink wrap material as claimed in claim 21 , wherein said unbonded overlying portions of the nonwoven fabric include edge portions extending from the adhesive, said edge portions being deflected over said bonded areas.
26. Shrink wrap material as claimed in claim 25 , wherein said unbonded areas of the nonwoven fabric separates from said film upon shrinking of the film.
27. Shrink wrap material as claimed in claim 21 , wherein said unbonded areas of the nonwoven fabric include deflecting portions deflecting over the bonded areas of the nonwoven upon shrinking of the film to thereby protect the surface from abrasion by the bonded portions of the nonwoven.
28. Shrink wrap material as claimed in claim 21 , wherein said unbonded overlying portions of nonwoven fabric include pillows having portions which extend over said bonded portions.
29. Shrink wrap material as claimed in claim 21 , wherein said pillows have an increasing average height dimension from base to pinnacle prior to application over a surface as the shrink rate of said film increases.
30. Shrink wrap material as claimed in claim 29 , wherein said average height dimension of said pillows increases by a factor of at least about two times for each 10% increase in the shrink rate of said film.
31. Shrink wrap material as claimed in claim 21 , wherein said adhesive covers between 4.0 to about 33.0% of said film.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/725,644 US20040137816A1 (en) | 2000-09-19 | 2003-12-02 | Material for protecting articles having a nonwoven fabric bonded to a shrink film by an adhesive applied in a predetermined pattern |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/664,896 US6562740B1 (en) | 2000-09-19 | 2000-09-19 | Material for protecting articles having a nonwoven fabric bonded to a shrink film by an adhesive applied to the film in a pre-determined pattern |
US10/079,642 US6875712B2 (en) | 2000-09-19 | 2002-02-20 | Material for protecting articles having a nonwoven fabric bonded to a shrink film by an adhesive applied in a pre-determined pattern |
US10/725,644 US20040137816A1 (en) | 2000-09-19 | 2003-12-02 | Material for protecting articles having a nonwoven fabric bonded to a shrink film by an adhesive applied in a predetermined pattern |
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US10/079,642 Division US6875712B2 (en) | 2000-09-19 | 2002-02-20 | Material for protecting articles having a nonwoven fabric bonded to a shrink film by an adhesive applied in a pre-determined pattern |
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US20040137816A1 true US20040137816A1 (en) | 2004-07-15 |
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US10/079,642 Expired - Lifetime US6875712B2 (en) | 2000-09-19 | 2002-02-20 | Material for protecting articles having a nonwoven fabric bonded to a shrink film by an adhesive applied in a pre-determined pattern |
US10/725,644 Abandoned US20040137816A1 (en) | 2000-09-19 | 2003-12-02 | Material for protecting articles having a nonwoven fabric bonded to a shrink film by an adhesive applied in a predetermined pattern |
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US10/079,642 Expired - Lifetime US6875712B2 (en) | 2000-09-19 | 2002-02-20 | Material for protecting articles having a nonwoven fabric bonded to a shrink film by an adhesive applied in a pre-determined pattern |
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US20080242173A1 (en) * | 2007-03-27 | 2008-10-02 | Markow Ari L | UV light- and moisture-resistant textile barrier |
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CN103192567B (en) * | 2012-01-09 | 2016-05-11 | 佛山金万达科技股份有限公司 | Thermoplastic resin film layer compound and preparation method thereof |
US20140087145A1 (en) | 2012-09-27 | 2014-03-27 | Eastman Chemical Company | Self-corrugating laminates and methods of making them |
US9064994B2 (en) | 2013-04-26 | 2015-06-23 | Eastman Chemical Company | Self-corrugating laminates useful in the manufacture of thermoelectric devices and corrugated structures therefrom |
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US11155058B2 (en) | 2019-10-21 | 2021-10-26 | Transhield, Inc. | Laminated fabrics and protective covers with post-industrial and/or post-consumer content and methods of making laminated fabrics and protective covers with post-industrial and/or post consumer content |
US11046052B1 (en) | 2020-05-22 | 2021-06-29 | Transhield, Inc. | Protective covers and methods of manufacture and use |
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US20020077015A1 (en) | 2002-06-20 |
US6875712B2 (en) | 2005-04-05 |
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STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |