EP1007785B1 - Papermaking belt with improved elongation resin - Google Patents

Papermaking belt with improved elongation resin Download PDF

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Publication number
EP1007785B1
EP1007785B1 EP98915031A EP98915031A EP1007785B1 EP 1007785 B1 EP1007785 B1 EP 1007785B1 EP 98915031 A EP98915031 A EP 98915031A EP 98915031 A EP98915031 A EP 98915031A EP 1007785 B1 EP1007785 B1 EP 1007785B1
Authority
EP
European Patent Office
Prior art keywords
resinous polymer
elongation
papermaking belt
kpa
per square
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
EP98915031A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1007785A1 (en
Inventor
Glenn David Boutilier
Paul Dennis Trokhan
Michael Gomer Stelljes, Jr.
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.)
Procter and Gamble Co
Original Assignee
Procter and Gamble 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
Priority claimed from US08/853,561 external-priority patent/US6010598A/en
Application filed by Procter and Gamble Co filed Critical Procter and Gamble Co
Publication of EP1007785A1 publication Critical patent/EP1007785A1/en
Application granted granted Critical
Publication of EP1007785B1 publication Critical patent/EP1007785B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • D21F11/006—Making patterned paper

Definitions

  • This invention relates to a papermaking belt comprised of a resinous polymer which exhibits improved properties.
  • Papermaking belts are utilized for producing patterned paper.
  • the paper made by utilizing a papermaking belt of the type disclosed in this invention is described in commonly assigned U.S. Patent Nos. 4,528,239 issued to Trokhan on July 9, 1985; 5,514,523 issued to Trokhan et al. on May 7, 1996; 5,503,715 issued to Trokhan et al. on April 2, 1996; 5,334,289 issued to Trokhan et al. on August 2. 1994; 5,554,467 issued to Trokhan et al. on September 10, 1996; 4.514,345 issued to Johnson et al. on April 30, 1985; 5,534,326 issued to Trokhan et al.
  • WO 96/25 555 discloses a web support apparatus comprising a curable resin arranged in a pattern.
  • Papermaking belts are typically composed of two key components: a reinforcing element; and a resinous polymer as taught by Trokhan '239 and Johnson et al. '345.
  • the resins utilized to make the papermaking belts of these teachings suffer from a common drawback wherein as the resins age during papermaking, embrittlement, cracking and resin loss occur resulting in limited belt life. It is believed that resin elongation is the key property lost as aging occurs.
  • This invention comprises a papermaking belt wherein the belt is comprised of a resinous polymer.
  • the resinous polymer is disposed in a framework. After curing, the polymer has an elongation at 22°C of at least about 100% and a tensile strength at room temperature of at least about 2600 psi (179260 kPa).
  • this same polymer After curing, this same polymer has an elongation of at least about 45% and a tensile strength of at least about 700 psi (48263 kPa) wherein both the elongation and tensile strength of the polymer are measured at a temperature of 90°C.
  • the cured resinous polymer after being aged for twenty-four hours at an air temperature of 140°C in a convection oven has an elongation measured at 22°C of at least about 70% and tensile strength measured at 22°C of at least about 2000 psi (137895 kPa).
  • FIG. 1 Plan view of one completely assembled embodiment of a papermaking belt
  • the present invention relates to a papermaking belt 10 comprising a resinous polymer 20 disposed within a framework.
  • the resinous polymer 20 after curing exhibits improved elongation without sacrificing hardness or creep resistance.
  • Most preferably the resinous polymer 20 of this invention is completely cured.
  • a resinous polymer 20 is considered completely cured at the point where no additional heat from polymerization is evolved upon continuing irradiation of the sample.
  • a calorimeter can be used to make this measurement. It should be noted that even at complete cure as described above, polymerizable groups may be trapped within the polymeric network and hence inaccessible to further polymerization.
  • the papermaking belts 10 of this invention may be made according to commonly assigned U.S. Patent Nos. 5.334,289 issued to Trokhan et al. on August 2, 1994; 4,514,345 issued to Johnson et al. on April 30, 1985; 5,527,428 issued to Trokhan et al. on June 18, 1996 and 4,529,480 issued to Trokhan on July 16, 1985 show how to make papermaking belts 10 for use with the present invention.
  • the four key materials required include: a reinforcing element 30 such as a woven screen; a barrier film such as a thermoplastic sheet; a mask comprising a framework of transparent and opaque regions wherein the opaque regions define a preselected pattern of gross foramina in the framework; and a liquid photosensitive resin which is cured during the beltmaking process in order to form a resinous polymer 20.
  • the reinforcing element 30 may be made according to commonly assigned U.S. Patent Nos. 5,500,277, issued March 19, 1996, to Trokhan et al. or 5,496,624, issued March 5, 1996, to Stelljes Jr. et al., Examples of suitable reinforcing elements 30 include paper machine clothing such as forming fabrics, wet press felts and dryer fabrics. Alternatively, a Jacquard weave reinforcing element 30 may be utilized for the papermaking belt 10 having a framework made of the resinous polymer 20 according to the present invention.
  • a method of producing a papermaking belt 10 includes applying barrier film to the working surface of the belt forming unit; juxtaposing a reinforcing element 30 to the barrier film so that the barrier film is interposed between the reinforcing element 30 and the forming unit; applying a coating of liquid photosensitive resin to the surfaces of the reinforcing element 30; controlling the thickness of the coating to a preselected value; juxtaposing in contacting relationship with the coating of liquid photosensitive resin a mask comprising a framework of both opaque and transparent regions; exposing the liquid photosensitive resin to light having an activating wavelength through the mask thereby inducing curing of the liquid photosensitive resin in those regions which are in register with the transparent regions of the mask; and removing from the reinforcing element 30 substantially all of the uncured liquid photosensitive resin.
  • the exact apparatus or equipment used in the practice of the present invention is immaterial so long as it can, in fact, be used to practice the present invention.
  • Properties of the resinous polymer 20 which are deemed to be important to papermaking belt 10 life include elongation, tensile strength, hardness and creep resistance at both room temperatures and elevated temperatures. In order to maximize the life of the papermaking belt 10 it is especially desirable for the resinous polymer 20 at elevated temperatures, including those temperatures to which the belt 10 is exposed during use, to exhibit elongation without unduly sacrificing creep resistance, tensile strength, or hardness relative to the prior art.
  • the resinous polymer 20 of this invention has a room temperature elongation measured at 22°C of at least about 100%, more preferred of about 110% and even more preferred of 125%.
  • the resinous polymer 20 of this invention exhibits improved ultimate elongation while resisting creep and without undue loss of tensile strength and hardness relative to the prior art.
  • the preferred liquid photosensitive resin composition of this invention is comprised of four key classes of components: a prepolymer; monomers; photoinitiator and antioxidants.
  • a preferred liquid photosensitive resin is Merigraph L-055 available from MacDermid Imaging Technology, Inc. of Wilmington, Delaware.
  • the prepolymer of this liquid photosensitive resin is made from a methacrylated or acrylated polyurethane formed from polyethers and is substantially free of polyesters.
  • the prepolymer is a polyurethane derived from the reaction of a diisocyanate compound with a polyol.
  • the polyol is preferably comprised of a hydroxy terminated polyether compound which is substantially polyester free.
  • a polyol containing substantially all polyether is preferred over polyols which contain either all polyester or a mixture of polyether and polyester as it is believed that ester segments increase the possibility of transesterfication. Transesterfication is a mechanism which can result in molecular weight loss of the prepolymer. The molecular weight loss of the prepolymer can in turn result in a loss of resinous polymer 20 elongation. Additionally, without being bound by theory, it is believed that polyethers offer more hydrolytic stability than polyesters or blends of polyesters and polyethers.
  • the preferred polyurethane is endcapped or functionalized with a methacrylate or acrylate group.
  • the polyurethane-based prepolymer is preferably comprised mainly of polyethers and is substantially free of polyesters.
  • the polyethers are comprised preferably of ethylene oxide. propylene oxide and butylene oxide.
  • the liquid photosensitive resin of this invention is also comprised of a mixture of monomers including mono-functional. difunctional and trifunctional monomers containing acrylate or methacrylate groups.
  • the preferred monofunctional monomers are hydroxyalkyl acrylates or hydroxyalkyl methacrylates.
  • a photoinitiator most preferably comprised of 2.2-dimethoxy-2-phenylacetophenone is also utilized.
  • the photoinitiator is added to the liquid photosensitive resin formulation in an amount of preferably about .05%- 1.0% of the total weight of the resin formulation.
  • a suitable photoinitiator is available from Ciba Geigy Corp. of Hawthorne, New York as Irgacure 651.
  • the antioxidant component of the liquid photosensitive resinous polymer may be carried out according to commonly assigned U.S. Pat. Nos. 5,059,283 issued to Hood et al. on October 22, 1991 and 5,0573,235 issued to Trokhan on December 17, 1991.
  • Antioxidants are added to the liquid photosensitive resin formulation in order to prevent the resinous polymer 20 from oxidizing and causing degradation of the papermaking belt 10 resulting in premature belt 10 failure.
  • Suitable chemicals which may be used as antioxidants include but are not limited to: high molecular weight hindered phenols, secondary amines, phosphates, phosphites, thioesters, sulfur-containing compounds and secondary sulfides.
  • Preferred antioxidants used in the present invention include: Irganox 1010 marketed by Ciba Geigy Corp. of Hawthorne, New York and Cyanox 1790 marketed by Cytec Industries Inc. of West Paterson, New Jersey. Antioxidants are preferably added in a concentration of from about .001% to 5.0% by weight.
  • the type of papermaking belts 10 described in this invention may be used in conjunction with a variety of different types of paper machines systems and configurations well known in the art including but not limited to fourdrinier forming sections, twin wire formers, crescent formers, through air drying systems and conventional press sections.
  • the resinous polymer coupons are prepared by casting a .040 inch (0.102 cm) layer of liquid photosensitive resin over a 1 mil thick polypropylene film and covering it with a .004 inch thick polyester film, on a Merigraph 2228 photopolymer exposure unit available from MacDermid Imaging Technology of Wilmington, Delaware. The sample is first exposed for 30 seconds to the upper lamps and then exposed for 400 seconds to the lower lamps. Both films are removed after curing.
  • resinous polymer coupons are tested according to ASTM test method D-638. Each coupon is die cut by using a standard type IV dumbell die. The resinous polymer coupon is cut by striking the die with a hammer. The coupon is cut so as to have an overall length of 4.5 inches (11.4 cm), a width at the narrowest section of the coupon of 0.25 inches (0.63 cm) and an overall width of 0.75 inches (1.90 cm).
  • a suitable die is available from Testing Machines Inc, of Amityville, New, York.
  • a resinous polymer coupon is inserted in a tensile tester such as an Instron tensile tester model No. 1122 made by the Instron Corporation of Canton, Massachusetts.
  • a cross-head separation speed of 2 inches (5.1 cm) per minute and a gauge length of 2.5 inches (6.35 cm) are selected.
  • the sample is loaded into the tensile tester and tested to breakage by straining the coupon sample until it reaches its breaking point.
  • the elongation at the point of breakage is measured directly from the tensile tester or, alternatively may be measured using a chart recorder as is well known in the art.
  • Hardness of the resinous polymer coupons is measured according to ASTM test method D-2240 using a Shore D durometer gauge and a leverloader stand available from the Shore Instrument and Manufacturing Company of Freeport, New York. Resinous polymer coupons used for hardness testing are cut with a circular die of 1 inch (2.54 cm) in diameter. The circular coupons are stacked to achieve a total sample thickness of at least .250 inches (0.64 cm) prior to testing.
  • Resinous polymer 20 properties including tensile strength, elongation, creep and Shore D hardness are also measured at elevated temperatures. Tensile strength and elongation are measured at 90°C on an Instron Tensile Tester in which the crosshead grips of the Instron are enclosed in an environmental test chamber heated to 90°C ⁇ 1°C. Suitable environmental test chambers are available from Instron Corp. of Canton, Massachusetts. The resinous polymer coupon to be tested is also placed in the test chamber for three minutes and then immediately tested on the Instron.
  • leverloader stand and resinous polymer coupon samples are preheated to 90°C in a forced draft laboratory oven for 30 minutes and then tested in the oven according to the procedure described above.
  • Creep resistance is measured using a Bohlin CVO Controlled Stress rheometer manufactured by Bohlin Corporation of Cranbury, New Jersey.
  • the resinous polymer coupon samples are heated to 90°C for ten minutes in the rheometer and then tested. Creep measurements are taken at 25% strain and 100 seconds after the initial load has been applied.
  • the resinous polymer 20 of this invention at 90°C and 25% strain will exhibit a creep modulus of greater than about 2 x 10 7 dynes/cm 2 (2 x 10 5 millinewton/cm 2 ) wherein the modulus decreases less than 10% in the initial 100 seconds after the stress has been applied.
  • a resinous polymer coupon made according to the procedure described above is aged for twenty-four hours in a convection oven at a temperature of 140 ⁇ 2°C.
  • the coupon is removed after twenty-four hours and tested as soon as reasonably practical as described above after allowing the coupon to cool to 22°C. This same test is repeated on a coupon aged for ninety-six hours.
  • the properties of the resinous polymer 20 aged at elevated temperatures according to the present invention and the prior art are set forth in Table III below. Hrs. Sample is Maint. at 140°C Prior Art Resin Elong. (%) Pres. Inv. Resin Elong. (%) Prior An Tensile Strength (6.89 KPa) (psi) Present Invention Tensile Strength (6.89 KPa) (psi) 24 62.5 89.0 2929 2600 96 44.3 80.0 1808 2100

Landscapes

  • Paper (AREA)
  • Reinforced Plastic Materials (AREA)
  • Belt Conveyors (AREA)
  • Laminated Bodies (AREA)
EP98915031A 1997-05-08 1998-04-29 Papermaking belt with improved elongation resin Expired - Lifetime EP1007785B1 (en)

Applications Claiming Priority (7)

Application Number Priority Date Filing Date Title
US853561 1986-04-18
US4598397P 1997-05-08 1997-05-08
US4598297P 1997-05-08 1997-05-08
US08/853,561 US6010598A (en) 1997-05-08 1997-05-08 Papermaking belt with improved life
US45983P 1997-05-08
US45982P 1997-05-08
PCT/IB1998/000650 WO1998050627A1 (en) 1997-05-08 1998-04-29 Papermaking belt with improved elongation resin

Publications (2)

Publication Number Publication Date
EP1007785A1 EP1007785A1 (en) 2000-06-14
EP1007785B1 true EP1007785B1 (en) 2003-03-19

Family

ID=27366806

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98915031A Expired - Lifetime EP1007785B1 (en) 1997-05-08 1998-04-29 Papermaking belt with improved elongation resin

Country Status (18)

Country Link
EP (1) EP1007785B1 (ja)
JP (1) JP4331268B2 (ja)
KR (1) KR100365395B1 (ja)
CN (1) CN1106480C (ja)
AR (1) AR017502A1 (ja)
AT (1) ATE234960T1 (ja)
BR (1) BR9808756A (ja)
CA (1) CA2289061C (ja)
CO (1) CO5050280A1 (ja)
DE (1) DE69812373T2 (ja)
EG (1) EG21252A (ja)
ES (1) ES2195330T3 (ja)
HK (1) HK1028627A1 (ja)
HU (1) HUP0004798A2 (ja)
IL (1) IL132650A0 (ja)
NO (1) NO995418L (ja)
TW (1) TW419552B (ja)
WO (1) WO1998050627A1 (ja)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USD636608S1 (en) 2009-11-09 2011-04-26 The Procter & Gamble Company Paper product

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5629052A (en) * 1995-02-15 1997-05-13 The Procter & Gamble Company Method of applying a curable resin to a substrate for use in papermaking

Also Published As

Publication number Publication date
TW419552B (en) 2001-01-21
JP4331268B2 (ja) 2009-09-16
HK1028627A1 (en) 2001-02-23
IL132650A0 (en) 2001-03-19
NO995418D0 (no) 1999-11-05
CO5050280A1 (es) 2001-06-27
ES2195330T3 (es) 2003-12-01
CA2289061A1 (en) 1998-11-12
JP2001524172A (ja) 2001-11-27
EP1007785A1 (en) 2000-06-14
HUP0004798A2 (en) 2001-04-28
DE69812373T2 (de) 2003-08-21
CA2289061C (en) 2004-11-02
EG21252A (en) 2001-04-01
ATE234960T1 (de) 2003-04-15
AR017502A1 (es) 2001-09-12
KR100365395B1 (ko) 2002-12-26
WO1998050627A1 (en) 1998-11-12
DE69812373D1 (de) 2003-04-24
NO995418L (no) 2000-01-07
BR9808756A (pt) 2000-10-03
CN1255174A (zh) 2000-05-31
CN1106480C (zh) 2003-04-23
KR20010012380A (ko) 2001-02-15

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