US1667691A - Proofed paper - Google Patents

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Publication number
US1667691A
US1667691A US15086826A US1667691A US 1667691 A US1667691 A US 1667691A US 15086826 A US15086826 A US 15086826A US 1667691 A US1667691 A US 1667691A
Authority
US
United States
Prior art keywords
paper
proofing
bath
infused
web
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
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English (en)
Inventor
Reid James
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.)
SCUTAN Co
Original Assignee
SCUTAN 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 SCUTAN Co filed Critical SCUTAN Co
Priority to US15086826 priority Critical patent/US1667691A/en
Priority to GB3170427A priority patent/GB281316A/en
Priority to DES82748D priority patent/DE514922C/de
Application granted granted Critical
Publication of US1667691A publication Critical patent/US1667691A/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
    • 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
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/60—Waxes
    • 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
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/61—Bitumen
    • 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
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31815—Of bituminous or tarry residue
    • Y10T428/31819—Next to cellulosic
    • Y10T428/31823—Paper

Definitions

  • the resent invention relates to a proofed cellulosic product, particularly to a waterproof aper made from a paper having a base of wood or cotton fibre.
  • My inventlon is primarily directed to the treatment of close grained materials such as paper as d1stinguished from loose formed bodies suchas building felt. Accordingly, I broadly term the basic material close grained cellulosie fibrous material.
  • My invention is based upon the d scovery that if proper precautions and conditions are had, it is possible to infuse the surface layers of a sheet of close grained cellulo'sic fibrous material with a viscous compound at a temperature which normally would substantially destroy such material.
  • a type of impregnation or infusion can be obtained which has never before been possible, with the result that I can produce a product having markedly different characteristics from those which have heretofore been made.
  • cellulosic fibrous material such as paper, the fibres of which are unprotected, is exposed to a temperature substantially above 250 F. it will be so carbonized that it will lose all its strength. According to my process such a material is plunged into a bath of viscous proofing compound which has a temperature substantially above 250 and preferably is above 400, under such conditions that the surface layers will be infused with the proofing agent, but the middle of the sheet will have lts fibres 'uncoated. In applying such a temperature to the paper or similar material, great care must be taken to reduce the access of air. Also the time of treatment must be short 40 and after the treatment, provisionmust be made for rapid cooling so that air does not contact with uncoated fibres at carbonizing temperature.
  • the proofing compound may be of various rubber or bituminous material which I have used has a melting point above 250, for example, I may use a material having a melting point of from 290 to 310 F., ring and ball method.
  • the scale wax which is a paraflin product, has a melting point of about 122.
  • the Montan wax is a natural wax in'iported from Germany, and the type which I have used is a crude Wax, black 1n color, with a melting point of about 168.
  • the mixed bath has a melting point of above 250 F. and when cool has very little tackiness due to the presence of-tfic waxes. I heat this bath to a temperature above 350 F.-say 450---at which temperature it isliquid but still extremely viscous.
  • the web of fibrous material always contains a certain amount of moisture.
  • -steam is evolved;
  • The-steam escaping from the web forms a stiff but cellular coating over the bath which I term a brat because of its resemblance-to the coating which forms when cheese is made.
  • the brat should be allowed to develop until it is several inches thick when the surface will be found to be quite cool.
  • the brat serves to keep the heat in the bath and also serves as a protective coating through which the web passes as it is being heated, so that the hot fibres are not exposed to the air.
  • the web should be in the bath for only about five seconds where the bath is heated to a temperature of about 450 F. Under these conditions, infusion does not reach a maximum, with a rmult that in the finished prodnot the fibres of the center layers are substantially unaffected by the proofing material. This gives to the finished product a high degree of flexibility, for the unproofed fibres of the center layers can move relativelyto each other, permitting the surface layers to act more or less independently. For example, using kraft paper as a base, the finished product can be creased and folded without cracking in the same way as can be done with the unproofed paper. At the same time the bursting strength of the paper is somewhat increased. I
  • the amount of proofing material that is infused into the surface portions of the paper may be varied with the temperature, time of treatment. etc. but for general results I have found it .advisable to incorporate from 15% to 35% of proofing material (based on the weight of the finished prod net). This will give a product with about one-third to one-quarter of its thickness noninfused.
  • the amount of infused material may be determined by treating the paper with appropriate solvents which will leave ing waterproof bags or containers or as a strong waterproofwrapping where a fixed moisture content is to be maintained, or where dryness is essential as with explosives and some chemicals; it has sufficient strength and a proper surface sov it can be embossed to make a waterproof imitation leather, and its flexibility permits it to be used for making cheap umbrellas.
  • the surplus is stripped off and the paper, as before, allowed to cool quickly causing the proofing agent to be drawn intothe pores of the fibres to replace the volatilized moisture.
  • the amount of proofing agent used should be about the same as in the other case, from one-quarter to one-third of the paper being left non-infused.
  • a process of proofing close-grained paper of substantial strength .and flexibility without destroying such flexibility and strength which comprises" the steps of assing a sheet of such paper through a ath of relatively high melting point proofing material of a bituminous nature heated to a temperature substantially above 250 F., and until the bath is liquid but still viscous, and removing the sheet from ,the bathbefore it is saturated with the proofing material.
  • proofing material comprises a major proportion of bituminous. material having a melting point above 290 F. and the bath is heated above 400 F.
  • a process of producing highly flexible proofed paper with a non-tacky surface which comprises the steps of infusing into the surface of a sheet of close grained fibrous cellulosic material less than enough relatively high melting point bituminous proofing agent to permeate the entire thickness of the sheet by contacting the paper with the proofing agent in an extremely viscous statebut at a temperature substantially above 250 F., withdrawing the paper from the mass of proofing agent before it is fully infused, stripping off surplus proofing material and causing the sheet to cool rapidly.
  • a process of producin proofed paper which comprises the steps 0 heat-ing a muture of bituminous material and wax to a.
  • terial a surface layer of which is infusedwith a bituminous proofing material which has a melting point above 250 F. and which has a layer which is non-infused, the infused layer being substantially non-tacky at atmospheric temperatures.
  • a new product of considerable strength and with flexibility corresponding to t at of paper comprising paper the surface layers of which are infused with a bituminous proofing agent which is substantially nontacky at atmospheric temperatures and comprises a major portionof bituminous material having a melting point above 290'F., while the center layers are substantially non-infused.

Landscapes

  • Paper (AREA)
  • Laminated Bodies (AREA)
  • Synthetic Leather, Interior Materials Or Flexible Sheet Materials (AREA)
US15086826 1926-11-26 1926-11-26 Proofed paper Expired - Lifetime US1667691A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US15086826 US1667691A (en) 1926-11-26 1926-11-26 Proofed paper
GB3170427A GB281316A (en) 1926-11-26 1927-11-24 Improvements in proofed paper and method of producing same
DES82748D DE514922C (de) 1926-11-26 1927-11-25 Verfahren zur Herstellung von wasserdichtem biegsamen Papier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US15086826 US1667691A (en) 1926-11-26 1926-11-26 Proofed paper

Publications (1)

Publication Number Publication Date
US1667691A true US1667691A (en) 1928-04-24

Family

ID=22536329

Family Applications (1)

Application Number Title Priority Date Filing Date
US15086826 Expired - Lifetime US1667691A (en) 1926-11-26 1926-11-26 Proofed paper

Country Status (3)

Country Link
US (1) US1667691A (de)
DE (1) DE514922C (de)
GB (1) GB281316A (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2496566A (en) * 1946-10-19 1950-02-07 Szwarc Alexander Water-vapor resistant coated paper
US5752327A (en) * 1994-12-08 1998-05-19 Basf Aktiengesellschaft Particle fluidization method and apparatus therefor

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE910397C (de) * 1940-12-10 1954-05-03 Groneweg & Meintrup Luftdichte Packung, insbesondere fuer Kaffee od. dgl.

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2496566A (en) * 1946-10-19 1950-02-07 Szwarc Alexander Water-vapor resistant coated paper
US5752327A (en) * 1994-12-08 1998-05-19 Basf Aktiengesellschaft Particle fluidization method and apparatus therefor

Also Published As

Publication number Publication date
DE514922C (de) 1930-12-20
GB281316A (en) 1928-05-10

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