US3839137A - Corrugated film having increased stiffness - Google Patents

Corrugated film having increased stiffness Download PDF

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Publication number
US3839137A
US3839137A US00221677A US22167772A US3839137A US 3839137 A US3839137 A US 3839137A US 00221677 A US00221677 A US 00221677A US 22167772 A US22167772 A US 22167772A US 3839137 A US3839137 A US 3839137A
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US
United States
Prior art keywords
film
corrugation
lanes
corrugated
stiffness
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00221677A
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English (en)
Inventor
R Davis
T Dickerhofe
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 US00221677A priority Critical patent/US3839137A/en
Priority to CA161,705A priority patent/CA1012319A/en
Priority to BE794568D priority patent/BE794568A/xx
Priority to JP1038073A priority patent/JPS5651889B2/ja
Priority to FR7302828A priority patent/FR2169331B1/fr
Priority to LU66913A priority patent/LU66913A1/xx
Priority to IT19707/73A priority patent/IT978553B/it
Priority to DE2303923A priority patent/DE2303923C2/de
Priority to NLAANVRAGE7301140,A priority patent/NL178664C/xx
Priority to GB410373A priority patent/GB1380024A/en
Application granted granted Critical
Publication of US3839137A publication Critical patent/US3839137A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
    • H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
    • H01B7/189—Radial force absorbing layers providing a cushioning effect
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C67/00—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00
    • B29C67/0011—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00 for shaping plates or sheets
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/02—Disposition of insulation
    • 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.]
    • Y10T428/24628—Nonplanar uniform thickness material
    • Y10T428/24669—Aligned or parallel nonplanarities
    • Y10T428/24694—Parallel corrugations
    • Y10T428/24702—Parallel corrugations with locally deformed crests or intersecting series of corrugations

Definitions

  • Corrugated polymeric film can be stiffened in the direction transverse to corrugation lines by creating flattened, i.e., noncorrugated, narrow width lanes in that transverse direction.
  • This invention relates to corrugated polymeric film having increased stiffness.
  • Corrugated films are being used increasingly for many applications One use is in the formation of a core wrap for electrical cable as described in Roberts, US. Pat. No. 3,244,799, and assignees application of Everhart et al., Ser. No. 34,812, filed May 5, 1970, now abandoned. In such applications, the corrugated film provides mechanical protection, thermal insulation, dielectric protection and electrical stability for the core. Corrugated films are also useful in packaging applications either alone or when laminated to uncorrugated films such as described in assignees application of R- gers, application Ser. No. 113,849, filed Feb. 9, 1971, now US. Pat. No. 3,684,642. In such applications, the corrugated film contributes not only to the appearance and protection of the package but also provides dead fold properties which enable an opened package to be closed by creasing and also provides for the formation of sharp, well-defined corners on the package.
  • Corrugated films have a rather pronounced degree of stiffness in the direction of the corrugation lines. However, in a direction transverse to the corrugation lines, they exhibit less stiffness and even may tend to curl which may cause problems in film handling, especially on automatic film-handling equipment.
  • TD stiffness the stiffness of a corrugated polymeric film in a direction transverse to the direction of the lines of corrugation
  • FIG. 11 is an isometric view of a portion of a typical film in accordance with this invention.
  • FIG. 2 is a portion of an enlarged sectional view of the film of FIG. 1 taken along cut 2-2.
  • corrugated is used herein to describe a film with a cross section such as that shown in FIG. 5 of Roberts, US. Pat. No. 3,244,799, having from about to about 40 corrugations per inch.
  • the other geometrical configurations shown in that patent may also be used.
  • polymeric film includes regenerated cellulose films (cellophane) as well as films of polypropylene, polyesters, e.g., polyethylene terephthalate, highdensity polyethylene, and laminates thereof.
  • the poly meric material should be rather high in modulus, i.e., above about 80,000 psi.
  • the films of this invention before corrugation may range across a broad range of thicknesses; however, with films above about 5 mils, the need for stiffening in the direction transverse to the corrugation lanes is not as great. Accordingly, the stiffening afforded by the invention is most valuable on films between about 0.25 and 3.5 mils in thickness.
  • the films may be oriented in one or both directions; however, if oriented, they must be heat set sufficiently to resist shrinkage during corrugation and during formation of the noncorrugated lanes.
  • noncorrugated lanes is used herein to mean and is illustrated in the drawing as a series of narrow width lanes 10 transverse to the direction of the corrugation lines 11 wherein the undulations of the corrugation have been substantially ironed fiat.
  • the lane width A is not particularly critical but generally ranges from about one thirty-second to about one eighth of an inch.
  • the frequency of the lanes can be varied to meet the particular stiffness properties desired in the film. It is usually desirable to have more than one but fewer than about eight noncorrugated lanes per inch. For most purposes, it is preferred to have between about two and six lanes per inch.
  • the film may be corrugated by running a preheated film between a pair of interfitting, meshing corrugating wheels which coact'to press the heated film into the desired longitudinally grooved, laterally waved, corrugated shape.
  • the corrugation ratio is the ratio of the thickness of the corrugated film over the thickness of the uncorrugated film. If it is desired to have good dead fold in the corrugated film, the corrugation ratio should usually be at least about 6.
  • the film is preheated between about 50 to 100C. by over and under contact with one or more of a series of internally heated rollers or drums usually about C.
  • a preheating temperature should be high enough to avoid coating blush on coated films but not so high as to damage the coating.
  • the preheated film is then led partially around and between the corrugating wheels which are both generally kept somewhere near room temperature by circulating tap water therethrough.
  • the stiffness in the transverse direction of the corrugated films is measured by the Gurley stiffness test, which, briefly described, comprises testing in a device which measures the resistance to bending, under conditions of uniform load, of a strip of film, e.g., 2 inches wide and 1 inch long, with the lanes running parallel to the length.
  • the force in milligrams (mg.) is measured which is necessary to deflect the sample a given distance by application of the force near the end of the length of the strip.
  • corrugated films of about 2.84 mils in thickness have a TD stiffness of about 25 mg. which is too limp for many uses. However, a TD stiffness of over 100 mg. may be too stiff for many applications. It is generally desired in accordance with this invention to create a TD stiffness between about 50 to mg. As will be seen by one skilled in the art, this can be a function of film thickness, modulus, corrugation configuration and even corrugation ratio as well as the width and frequency of noncorrugated lanes created in the film transverse to the corrugation lines in accordance with this invention.
  • the narrow width, noncorrugated lanes may be formed transverse to the corrugation lines of the corrugated film in a number of ways which will readily occur to one skilled in the art. Generally speaking, they are best formed by a heated ironing out of the undulations in a defined path. A suitable method for forming the noncorrugated lanes will be described in connection with the following examples.
  • a polyethylene terephthalate film laminate about 2.84 mils thick is prepared by laminating a pair of films 1.42 mils thick by heat and pressure and is corrugated as described hereinabove to a corrugation ratio of about 3.5 with about 32 corrugations per inch.
  • the Gurley stiffness in a direction transverse to the corrugation lines is about 22 mg.
  • the film is run into the nip formed by an embossing or ironing roll and a hard rubber-covered nip roll.
  • the embossing roll is 16 inches long and 8.5 inches in diameter.
  • One hundred seven grooves parallel to the roll axis are formed in the surface of the roll approximately three-sixteenths inch wide and three thirty-seconds inch deep leaving a onesixteenth inch uncut metal land between each groove. This will form four lanes per inch.
  • the process variables are machine speed, nip roll pressure, and ironing roll temperature.
  • the data appearing in the following Table are representative. In general, the stiffness is found to be related to roll temperature, nip roll pressure and film residence time on the embossing roll.
  • the addition of the lanes improves the amount of TD stiffness to the degree noted. It is advantageous that the amount of flattening caused by the lanes does not adversely affect the dielectric strength of the film when used in electrical applications such as a cable core wrap.
  • the stiffened films of this invention are used to wrap cable cores, a more cylindricalcross section can be obtained than with unstiffened corrugated films.
  • a corrugated polymeric film selected from the group consisting of polypropylene, thermoplastic polyesters, high-density polyethylene, and laminates thereof, having a thickness before corrugation of 0.25 to 3.5 mils, 20 to 40 corrugations per inch, a corrugation ratio of at least about 6, and a TD stiffness of less than about 38 mg. after corrugation, the improvement wherein said film has a series of noncorrugated lanes running transverse to the direction of the lines of corrugation, said lanes being about one thirty-second to oneeighth inch in width and there being two to six lanes per inch, such that the modified corrugated film has a TD stiffness between about 50 to mg.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Laminated Bodies (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
  • Insulated Conductors (AREA)
US00221677A 1972-01-28 1972-01-28 Corrugated film having increased stiffness Expired - Lifetime US3839137A (en)

Priority Applications (10)

Application Number Priority Date Filing Date Title
US00221677A US3839137A (en) 1972-01-28 1972-01-28 Corrugated film having increased stiffness
CA161,705A CA1012319A (en) 1972-01-28 1973-01-19 Corrugated film having increased stiffness
JP1038073A JPS5651889B2 (de) 1972-01-28 1973-01-26
FR7302828A FR2169331B1 (de) 1972-01-28 1973-01-26
BE794568D BE794568A (fr) 1972-01-28 1973-01-26 Pellicule ondulee de rigidite accrue
LU66913A LU66913A1 (de) 1972-01-28 1973-01-26
IT19707/73A IT978553B (it) 1972-01-28 1973-01-26 Pellicola ondulata avente una maggiore rigidezza
DE2303923A DE2303923C2 (de) 1972-01-28 1973-01-26 Gewellte Polymerfolie
NLAANVRAGE7301140,A NL178664C (nl) 1972-01-28 1973-01-26 Folie van polymeer met in elkaar overgaande golvingen.
GB410373A GB1380024A (en) 1972-01-28 1973-01-26 Corrugated polymeric film

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00221677A US3839137A (en) 1972-01-28 1972-01-28 Corrugated film having increased stiffness

Publications (1)

Publication Number Publication Date
US3839137A true US3839137A (en) 1974-10-01

Family

ID=22828851

Family Applications (1)

Application Number Title Priority Date Filing Date
US00221677A Expired - Lifetime US3839137A (en) 1972-01-28 1972-01-28 Corrugated film having increased stiffness

Country Status (10)

Country Link
US (1) US3839137A (de)
JP (1) JPS5651889B2 (de)
BE (1) BE794568A (de)
CA (1) CA1012319A (de)
DE (1) DE2303923C2 (de)
FR (1) FR2169331B1 (de)
GB (1) GB1380024A (de)
IT (1) IT978553B (de)
LU (1) LU66913A1 (de)
NL (1) NL178664C (de)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3964945A (en) * 1972-04-07 1976-06-22 E. I. Du Pont De Nemours And Company Method of making an electrical cable
US4461388A (en) * 1980-03-11 1984-07-24 Leggett & Platt, Incorporated Slip surface shelf merchandiser
US20050008825A1 (en) * 2001-11-21 2005-01-13 Casey William A. Embossed non-woven fabric having a three-dimensional structure
DE10343603A1 (de) * 2003-09-18 2005-04-14 Abb Patent Gmbh Isolierplatte
US20050100713A1 (en) * 2001-04-20 2005-05-12 The Procter & Gamble Company Self-bonded corrugated fibrous web
US8151542B2 (en) 2007-11-13 2012-04-10 Infinite Edge Technologies, Llc Box spacer with sidewalls
US8586193B2 (en) 2009-07-14 2013-11-19 Infinite Edge Technologies, Llc Stretched strips for spacer and sealed unit
US8789343B2 (en) 2012-12-13 2014-07-29 Cardinal Ig Company Glazing unit spacer technology
US20140290978A1 (en) * 2011-12-20 2014-10-02 Mitsubishi Electric Corporation Insulation structure of lead wire, transformer having the same, and method for insulating lead wire
US8967219B2 (en) 2010-06-10 2015-03-03 Guardian Ig, Llc Window spacer applicator
USD736594S1 (en) 2012-12-13 2015-08-18 Cardinal Ig Company Spacer for a multi-pane glazing unit
US9228389B2 (en) 2010-12-17 2016-01-05 Guardian Ig, Llc Triple pane window spacer, window assembly and methods for manufacturing same
US9260907B2 (en) 2012-10-22 2016-02-16 Guardian Ig, Llc Triple pane window spacer having a sunken intermediate pane
US9309714B2 (en) 2007-11-13 2016-04-12 Guardian Ig, Llc Rotating spacer applicator for window assembly
US9689196B2 (en) 2012-10-22 2017-06-27 Guardian Ig, Llc Assembly equipment line and method for windows

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4076121A (en) * 1973-10-15 1978-02-28 Mobil Oil Corporation Reinforced thin wall plastic bag, and method and apparatus to make material for such bags
NL173574C (nl) * 1976-05-26 1984-02-01 Stamicarbon Werkwijze voor het in de grond leggen van kabels, alsmede daarbij te gebruiken band.
DE102019111083B4 (de) * 2019-04-29 2024-02-15 Delfingen Fr-Anteuil S.A. Schutzband, umwickeltes Kabelbündel und Verfahren

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1189140A (en) * 1915-08-26 1916-06-27 Sidney David Lane Corrugated or like packing material.
US3025340A (en) * 1959-04-06 1962-03-13 Anaconda Wire & Cable Co Flexible power cable
US3105872A (en) * 1960-11-10 1963-10-01 Anaconda Wire & Cable Co Electric cable
US3244799A (en) * 1963-04-02 1966-04-05 Superior Cable Corp Electrical cable with cable core wrap
US3518142A (en) * 1965-07-21 1970-06-30 Sun Oil Co Process for applying hot melt adhesive to corrugated paperboard
US3614299A (en) * 1970-07-17 1971-10-19 Exxon Research Engineering Co Low thermal conductivity cable core wrap

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB190619107A (en) * 1906-08-27 1907-01-24 Leonhard Lederer Improvements relating to Cellulose Compounds and to their application for the Manufacture of Filaments, Films, Ribbons and other Products.
GB1063335A (en) * 1963-06-11 1967-03-30 Thompson Bruce Roy Screens, strainers and the like and the manufacture thereof
US3608047A (en) * 1968-03-08 1971-09-21 Fort Howard Paper Co Method of manufacturing embossed paper products

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1189140A (en) * 1915-08-26 1916-06-27 Sidney David Lane Corrugated or like packing material.
US3025340A (en) * 1959-04-06 1962-03-13 Anaconda Wire & Cable Co Flexible power cable
US3105872A (en) * 1960-11-10 1963-10-01 Anaconda Wire & Cable Co Electric cable
US3244799A (en) * 1963-04-02 1966-04-05 Superior Cable Corp Electrical cable with cable core wrap
US3518142A (en) * 1965-07-21 1970-06-30 Sun Oil Co Process for applying hot melt adhesive to corrugated paperboard
US3614299A (en) * 1970-07-17 1971-10-19 Exxon Research Engineering Co Low thermal conductivity cable core wrap

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3964945A (en) * 1972-04-07 1976-06-22 E. I. Du Pont De Nemours And Company Method of making an electrical cable
US4461388A (en) * 1980-03-11 1984-07-24 Leggett & Platt, Incorporated Slip surface shelf merchandiser
US20050100713A1 (en) * 2001-04-20 2005-05-12 The Procter & Gamble Company Self-bonded corrugated fibrous web
US7427434B2 (en) * 2001-04-20 2008-09-23 The Procter & Gamble Company Self-bonded corrugated fibrous web
US20050008825A1 (en) * 2001-11-21 2005-01-13 Casey William A. Embossed non-woven fabric having a three-dimensional structure
US7678442B2 (en) * 2001-11-21 2010-03-16 Karl Freudenberg Kg Embossed non-woven fabric having a three-dimensional structure
DE10343603A1 (de) * 2003-09-18 2005-04-14 Abb Patent Gmbh Isolierplatte
US9127502B2 (en) 2007-11-13 2015-09-08 Guardian Ig, Llc Sealed unit and spacer
US9187949B2 (en) 2007-11-13 2015-11-17 Guardian Ig, Llc Spacer joint structure
US8596024B2 (en) 2007-11-13 2013-12-03 Infinite Edge Technologies, Llc Sealed unit and spacer
US9617781B2 (en) 2007-11-13 2017-04-11 Guardian Ig, Llc Sealed unit and spacer
US8795568B2 (en) 2007-11-13 2014-08-05 Guardian Ig, Llc Method of making a box spacer with sidewalls
US9309714B2 (en) 2007-11-13 2016-04-12 Guardian Ig, Llc Rotating spacer applicator for window assembly
US8151542B2 (en) 2007-11-13 2012-04-10 Infinite Edge Technologies, Llc Box spacer with sidewalls
US8586193B2 (en) 2009-07-14 2013-11-19 Infinite Edge Technologies, Llc Stretched strips for spacer and sealed unit
US8967219B2 (en) 2010-06-10 2015-03-03 Guardian Ig, Llc Window spacer applicator
US9228389B2 (en) 2010-12-17 2016-01-05 Guardian Ig, Llc Triple pane window spacer, window assembly and methods for manufacturing same
US20140290978A1 (en) * 2011-12-20 2014-10-02 Mitsubishi Electric Corporation Insulation structure of lead wire, transformer having the same, and method for insulating lead wire
US9260907B2 (en) 2012-10-22 2016-02-16 Guardian Ig, Llc Triple pane window spacer having a sunken intermediate pane
US9689196B2 (en) 2012-10-22 2017-06-27 Guardian Ig, Llc Assembly equipment line and method for windows
USD736594S1 (en) 2012-12-13 2015-08-18 Cardinal Ig Company Spacer for a multi-pane glazing unit
USD748453S1 (en) 2012-12-13 2016-02-02 Cardinal Ig Company Spacer for a multi-pane glazing unit
US8789343B2 (en) 2012-12-13 2014-07-29 Cardinal Ig Company Glazing unit spacer technology

Also Published As

Publication number Publication date
BE794568A (fr) 1973-07-26
NL178664B (nl) 1985-12-02
JPS4884172A (de) 1973-11-08
NL178664C (nl) 1986-05-01
DE2303923C2 (de) 1982-12-23
JPS5651889B2 (de) 1981-12-08
GB1380024A (en) 1975-01-08
NL7301140A (de) 1973-07-31
DE2303923A1 (de) 1973-08-02
CA1012319A (en) 1977-06-21
FR2169331B1 (de) 1977-04-22
FR2169331A1 (de) 1973-09-07
IT978553B (it) 1974-09-20
LU66913A1 (de) 1973-07-27

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