EP0736120B1 - Papiers aramides a surface lisse multicouche tres resistants, se caracterisant par une aptitude elevee a l'impression - Google Patents

Papiers aramides a surface lisse multicouche tres resistants, se caracterisant par une aptitude elevee a l'impression Download PDF

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Publication number
EP0736120B1
EP0736120B1 EP95907233A EP95907233A EP0736120B1 EP 0736120 B1 EP0736120 B1 EP 0736120B1 EP 95907233 A EP95907233 A EP 95907233A EP 95907233 A EP95907233 A EP 95907233A EP 0736120 B1 EP0736120 B1 EP 0736120B1
Authority
EP
European Patent Office
Prior art keywords
paper
floc
layer
aramid
layered
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
EP95907233A
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German (de)
English (en)
Other versions
EP0736120A1 (fr
Inventor
Philip Parks Burks, Jr.
Lee James Hesler
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
Publication of EP0736120A1 publication Critical patent/EP0736120A1/fr
Application granted granted Critical
Publication of EP0736120B1 publication Critical patent/EP0736120B1/fr
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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
    • D21H13/10—Organic non-cellulose fibres
    • D21H13/20—Organic non-cellulose fibres from macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H13/26—Polyamides; Polyimides
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/30—Multi-ply

Definitions

  • This invention relates to an improved layered aramid paper having a smooth surface and good tensile and tear strengths.
  • the smooth surface provides for better print clarity and makes such papers particularly useful for high temperature label applications.
  • Prior art techniques that improve on surface smoothness often lead to a reduced level of mechanical strength and/or thermal stability.
  • synthetic papers which have been pressed or calendered at high temperature and pressure will generally have fibers on the surface which cause roughness or snagging when the surface of the paper is worked during end use processing.
  • US-A-5,076,887 describes a multi-layered, high temperature resistant pressboard. All layers have the same uniform distribution of polyaramid fibrids and floc. The surface smoothness is not sufficient for the purpose of the present invention.
  • US-A-5,089,088 describes flash expansion of moist multi-layered boards, wherein each layer comprises the same uniform composition comprising aramid floc bonded by aramid fibrid.
  • This invention provides a multi-layered calendered aramid paper having a surface suitable for high quality printing characterized in that the paper contains from 40 to 55% by weight of fibrids and comprises a substrate layer which consists essentially of aramid fibrids and floc and one or two surface layers, each bonded to the substrate layer to form a single consolidated sheet, said surface layer(s) comprising from 10 to 67% of the weight of the paper and consisting essentially of from 65 to 90% by weight aramid fibrids and from 10 to 35% by weight aramid floc and wherein the entire surface of the paper is calendered and the sheet has a density of from 0.8 to 1.0 g/cc and a thickness of from 1 to 30 mils (0.0254 to 0.762 mm).
  • the multi-layered aramid papers of the invention are comprised of layers of different compositions to provide desired properties.
  • the surface layer(s) provide a smooth surface and contain from 65 to 90% aramid fibrid and from 10% to 35% of aramid floc.
  • the surface layer(s) constitutes from 10 to 67% of the weight of the paper.
  • the substrate layer provides high tear strength. In order for the multi-layered paper to behave as a unitary structure, it is preferred that the fibrous materials at the interface between layers be intermingled.
  • a layer of furnish i.e., a papermaking aqueous dispersion of floc and fibrid on an undried, previously formed layer of furnish in a paper making machine or by simultaneously depositing the layers of different composition on the screen of the paper making machine using a 2 or 3 layer hydraulic type headbox.
  • the paper coming off the machine is dried and calendered, to a thickness of from 1 to 30 mils.
  • the density of the layered paper is from 0.8 to 1.0 g/cc for use as labels.
  • the multi-layered papers of this invention have excellent mechanical properties.
  • the smooth surface retains a high degree of smoothness even after the necessary working to prepare it for end use applications. This quality is important if print clarity and color density is to be achieved.
  • Aramid floc is high temperature resistant floc or short fiber cut from longer aramid fiber, such as those prepared by processes described in U.S.-A-3,063,966; 3,133,138; 3,767,756 and 3,869,430. It refers to short fibers typically having a length of 2 to 12 mm and a linear density of 1-10 decitex, made of aromatic polyamide which is non-fusible.
  • the aramid fibrids can be prepared using a fibridating apparatus where a polymer solution is precipitated and sheared in a single step as described in U.S. -A-3,756,908.
  • the tensile break strength of paper is determined based on ASTM method D 828-87 for "Standard Test Method for Tensile Breaking Strength of Paper and Paperboard". Specimens are 2.54 cm wide and 20.3. cm long and the jaws of the tensile testing machine are initially separated by 12.7 cm. Ten paper samples are tested in the machine direction (MD) and ten are tested in the cross direction (CD) and the values for each direction are averaged. The total of the MD and CD strengths is divided by paper density and paper basis weight to obtain the Total Break Strength.
  • MD machine direction
  • CD cross direction
  • Thickness of papers is determined using calipers in accordance with ASTM D 374-79 (1986).
  • Density of papers is determined by determining the weight per unit area of the paper (Basis Weight) in accordance with ASTM D 646-86 and dividing by the thickness.
  • a two layered structure was made by combining fibrids of poly(m-phenylene isophthalamide) prepared as described in Example 1 of U.S. Pat. No. 3,756,908 and floc prepared by dry spinning poly(m-phenylene isophthalamide) from a solution containing 67% dimethyl acetamide (DMAc), 9% calcium chloride and 4% water.
  • the spun filaments were flooded with an aqueous liquid and contained about 100% DMAc, 45% calcium chloride and 30-100% water based on dry polymer.
  • the filaments were washed and drawn 4X in an extraction-draw process in which the chloride and DMAc contents were reduced to about 0.10% and 0.5%, respectively.
  • the filaments had a denier of 2 (2.2 dtex) and typical properties were: elongation to break, 34%, and tenacity, 4.3 grams/denier (3.8 dN/tex). The filaments were then cut to floc length of 0.27 inch (0.68 cm) and slurried in water to a concentration of about 0.35%.
  • Blends of fibrids and floc were separately fed to a 2-layer hydraulic type headbox which maintains each blend as a distinct layer until the slice exit where limited mixing of the layers occurs. This allows good bonding between the layers while still maintaining the individual nature of each layer.
  • the formed sheet is then processed as is normally done on a fourdrinier paper machine by pressing and drying.
  • the papers are dried completely using infrared heaters before being calendered at 320°C at a line speed of 30 feet per minute (9 meters per minute) using a pressure of 725 pounds per linear inch (130 kg/cm).
  • the composition of the layers varied from 35 to 65% fibrid, the remainder being floc.
  • the basis weight of each layer was adjusted so that the high fibrid layer (65% fibrid) ranged from 33 to 67% of the total basis weight of the final sheet.
  • the total fibrid content of the test papers ranged from 45 to 55% of the sheet versus 53% for the single layer control papers (C1-1).
  • Table 1 gives the basis weight of each layer and its composition.
  • Layered structures, 4.0-4.5 oz/yd 2 (135.6-152.6 g/m 2 ) were produced with high fibrid layers on both top and bottom of the structure.
  • the top and bottom plies (outer layers) had equal basis weight.
  • the top and bottom layers contain 65% fibrid and 35% floc.
  • the top layer was applied using a secondary headbox jetting the furnish onto an already formed sheet which was prepared using the headbox of Example 1.
  • the control (C2-1) was a single layer paper.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Paper (AREA)
  • Laminated Bodies (AREA)

Claims (2)

  1. Papier aramide calandré multicouche avant une surface convenant à une impression de haute qualité, caractérisé en ce que le papier contient de 40 à 55% en poids dc fibrides et comprend une couche de substrat qui consiste essentiellement en floc et fibrides d'aramide et une ou deux couches superficielles, chacune étant liée à la couche de substrat pour former une feuille unique consolidée, cette ou ces couches superficielles formant de 10 à 67% du poids du papier et consistant essentiellement en 65% à 90% en poids de fibrides d'aramide et en 10% à 35% en poids de floc d'aramide et dans lequel la surface totale du papier est calandrée et la feuille obtenue présente une densité de 0,8 à 1.0 g/cm3 et une épaisseur de 0,0254 à 0,762 mm (1 à 30 mils).
  2. Papier suivant la revendication 1, ledit papier comprenant deux couches superficielles liées étroitement aux faces opposées de cette couche de substrat.
EP95907233A 1993-12-21 1994-12-20 Papiers aramides a surface lisse multicouche tres resistants, se caracterisant par une aptitude elevee a l'impression Expired - Lifetime EP0736120B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US17084193A 1993-12-21 1993-12-21
US170841 1993-12-21
PCT/US1994/014672 WO1995017549A1 (fr) 1993-12-21 1994-12-20 Papiers aramides a surface lisse multicouche tres resistants, se caracterisant par une aptitude elevee a l'impression

Publications (2)

Publication Number Publication Date
EP0736120A1 EP0736120A1 (fr) 1996-10-09
EP0736120B1 true EP0736120B1 (fr) 1998-01-21

Family

ID=22621482

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95907233A Expired - Lifetime EP0736120B1 (fr) 1993-12-21 1994-12-20 Papiers aramides a surface lisse multicouche tres resistants, se caracterisant par une aptitude elevee a l'impression

Country Status (7)

Country Link
EP (1) EP0736120B1 (fr)
JP (1) JP3673277B2 (fr)
DE (1) DE69408170T2 (fr)
ES (1) ES2111394T3 (fr)
RU (1) RU2125131C1 (fr)
UA (1) UA37254C2 (fr)
WO (1) WO1995017549A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050230072A1 (en) * 2004-04-16 2005-10-20 Levit Mikhail R Aramid paper blend
US8268434B2 (en) * 2007-11-30 2012-09-18 E I Du Pont De Nemours And Company Honeycomb having a high compression strength and articles made from same
US8118975B2 (en) * 2007-12-21 2012-02-21 E. I. Du Pont De Nemours And Company Papers containing fibrids derived from diamino diphenyl sulfone
US8114251B2 (en) * 2007-12-21 2012-02-14 E.I. Du Pont De Nemours And Company Papers containing fibrids derived from diamino diphenyl sulfone
US9316342B2 (en) * 2012-04-18 2016-04-19 E I Du Pont De Nemours And Company Multilayered sheet
WO2013158696A1 (fr) * 2012-04-18 2013-10-24 E. I. Du Pont De Nemours And Company Feuille multicouche
KR101866526B1 (ko) * 2015-09-17 2018-06-14 주식회사 휴비스 내전압강도가 향상된 고평량 메타 아라미드 페이퍼

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5076887A (en) * 1990-09-25 1991-12-31 E. I. Du Pont De Nemours And Company Pressboard and process for its production
US5089088A (en) * 1991-02-28 1992-02-18 E. I. Du Pont De Nemours And Company Low-density, high strength aramid boards
US5667900A (en) * 1993-01-04 1997-09-16 E. I. Du Pont De Nemours And Company Aramid paper with high surface smoothness

Also Published As

Publication number Publication date
UA37254C2 (uk) 2001-05-15
WO1995017549A1 (fr) 1995-06-29
DE69408170T2 (de) 1998-08-20
DE69408170D1 (de) 1998-02-26
RU2125131C1 (ru) 1999-01-20
JPH09506938A (ja) 1997-07-08
JP3673277B2 (ja) 2005-07-20
ES2111394T3 (es) 1998-03-01
EP0736120A1 (fr) 1996-10-09

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