EP1306484A2 - Papier calque - Google Patents

Papier calque Download PDF

Info

Publication number
EP1306484A2
EP1306484A2 EP02257231A EP02257231A EP1306484A2 EP 1306484 A2 EP1306484 A2 EP 1306484A2 EP 02257231 A EP02257231 A EP 02257231A EP 02257231 A EP02257231 A EP 02257231A EP 1306484 A2 EP1306484 A2 EP 1306484A2
Authority
EP
European Patent Office
Prior art keywords
paper
tracing paper
weight
urea
urea solution
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.)
Pending
Application number
EP02257231A
Other languages
German (de)
English (en)
Other versions
EP1306484A3 (fr
Inventor
Graham Robert Bracewell
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.)
Arjo Wiggins Fine Papers Ltd
Original Assignee
Arjo Wiggins Fine Papers Ltd
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 Arjo Wiggins Fine Papers Ltd filed Critical Arjo Wiggins Fine Papers Ltd
Publication of EP1306484A2 publication Critical patent/EP1306484A2/fr
Publication of EP1306484A3 publication Critical patent/EP1306484A3/fr
Pending legal-status Critical Current

Links

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
    • D21H17/03—Non-macromolecular organic compounds
    • D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
    • D21H17/07—Nitrogen-containing compounds

Definitions

  • This invention relates to natural tracing paper suitable for conversion into envelopes or other products for which folding is required, for example packaging for luxury items (hereafter referred to as "luxury packaging").
  • Natural tracing paper derives its translucency primarily from the unusually high degree of refining given to the cellulose pulp fibres from which it is made. This results in a sheet without the air/fibre interfaces which give most papers their opacity. Natural tracing paper should not be confused with "prepared” tracing paper (also known as “vellum”) which is rendered translucent by impregnation with an oil or other transparentising chemical.
  • Natural tracing paper is dense and hard compared with most other papers. As a result, it is brittle and prone to cracking if it is folded or crumpled, unlike, for example, bond paper as used in photocopiers. Cracking, and consequent loss of strength, is particularly apparent if a hard fold is made across the grain of the tracing paper sheet, and the effect becomes worse with increasing grammage.
  • Softening agents of the kind used in regenerated cellulose film might also be considered for use in tracing paper, in view of their proven affinity or compatibility with cellulose.
  • Such softening agents include glycerol, propylene glycol and di-, tri- and poly-ethylene glycols. We evaluated all of these materials, and also monoethylene glycol and sorbitol, but none were satisfactory.
  • a strong aqueous urea solution we mean a solution of a concentration of at least 40% by weight, preferably around 50% by weight.
  • Japanese Patent Publication No. 45-38729 discloses introduction of solutions of guanidine, urea, thiourea or certain derivatives thereof into tracing paper in the wet state to provide improved tearing strength.
  • use of a 20% solution of guanidine hydrochloride is disclosed.
  • USSR Patent No. 239028 discloses the use of a solution containing a mixture of 85% gelatine and 15% urea (v/v) for surface treatment of a dry tracing paper intended for use as a base for light-sensitive diazo paper. The treatment is intended to increase the elasticity and transparency of the paper.
  • USSR Patent No. 1231094 discloses treatment of tracing paper with a solution of a mixture of carboxymethyl cellulose (CMC) and urea to improve product quality and reduce product cost (as a result of savings in the amount of pulp used) .
  • the CMC is present in an amount of from 50-62.6% by weight, with the amount of urea being, correspondingly, from 37.4-50% by weight.
  • a process for modifying natural tracing paper to reduce its susceptibility to cracking on folding wherein the paper is treated with an aqueous urea solution of a concentration of at least about 40% by weight, preferably about 50% by weight.
  • the invention resides in natural tracing paper containing urea introduced by a process according to said first aspect of the invention.
  • the present invention resides in the use, for the purpose of reducing the susceptibility of natural tracing paper to cracking on folding, of an aqueous urea solution of a concentration of at least about 40% by weight, preferably about 50% by weight.
  • the invention resides in envelopes, luxury packaging or other folded products produced from natural tracing paper according to said second aspect of the invention.
  • the urea treatment is conveniently carried out at the size press or bath of the paper machine on which the tracing paper is produced.
  • the treating solution may contain other ingredients besides urea, for example a surface sizing agent of the kind compatible with and conventionally used in natural tracing paper manufacture.
  • the surface sizing agent is present in the solution in an amount of about 0.5% w / w , based on weight of sizing agent as supplied, i.e. as an aqueous composition of about 20% solids content.
  • Natural tracing paper is manufactured at many different grammages. Papers within the range 110-115 gm -2 , and specifically ca. 112 gm -2 are probably the most widely manufactured. Typical properties for such natural tracing papers both according to the present invention (i.e treated with a 50% urea solution) and an otherwise similar untreated paper are shown in Table 1 below: Property Urea-treated Paper Untreated Paper Tear Strength (mN)(Tappi T414) MD 430 - 510 360 - 430 CD 500 - 800 390 - 470 MIT Fold (-) (Tappi T511) MD 3500 - 5500 1100 - 2200 CD 1400 - 3000 700 - 1600 Stretch (%) (Tappi T494) MD 6 - 9 4.5 - 6.5 CD 9 - 13 5 - 7 Tensile Strength (N/15mm)(Tappi T494) MD 100 - 130 115 - 145 CD 50 - 70 65 - 85 Stiffness (mN 15°/10mm) (ISO
  • a range of aqueous treating solutions was applied to sheets of ca.90gm -2 water leaf (unsized) natural tracing paper by means of a laboratory size press.
  • the sheets had been cut from paper produced on a full-scale Fourdrinier papermachine.
  • the wet pick-up was of the order of 20-25% in each case.
  • the active ingredient of the treating solutions were as follows:
  • the propylene glycol, diethylene glycol and 200 grade polyethylene glycol were used as commercially supplied, i.e. with no dilution.
  • the glycerol, monoethylene glycol and 400 grade polyethylene glycol were all diluted with an equal volume of water. Sorbitol and urea were each used at a range of different concentrations, namely 12.5%, 25% and 50% in the case of sorbitol and 20%, 40% and 50% in the case of urea.
  • the sheets were dried by clamping in handsheet rings, in order to ensure that the dried sheets were flat.
  • Discs of paper were cut from the dried sheets and were evaluated on a paired comparison basis by holding them vertically from one edge and shaking.
  • a trial reel of ca. 112 gm -2 natural tracing paper was manufactured in conventional manner on a Fourdrinier paper machine, except that a 50% urea solution was used in the size bath. Initially, i.e. at the start of the reel, no surface sizing agent was present. Part-way through manufacture of the trial reel a styrene copolymer sizing agent as conventionally used in the manufacture of natural tracing paper was introduced into the size bath solution at a concentration (after equilibration) of 0.5% (based on sizing agent as supplied at ca. 20% solids content). The properties of the resulting paper were determined, both in relation to the unsized paper produced at the start of the reel and the sized paper from the end of the reel.

Landscapes

  • Paper (AREA)
EP02257231A 2001-10-25 2002-10-17 Papier calque Pending EP1306484A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0125605A GB0125605D0 (en) 2001-10-25 2001-10-25 Tracing paper
GB0125605 2001-10-25

Publications (2)

Publication Number Publication Date
EP1306484A2 true EP1306484A2 (fr) 2003-05-02
EP1306484A3 EP1306484A3 (fr) 2004-09-29

Family

ID=9924498

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02257231A Pending EP1306484A3 (fr) 2001-10-25 2002-10-17 Papier calque

Country Status (2)

Country Link
EP (1) EP1306484A3 (fr)
GB (1) GB0125605D0 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2916769A1 (fr) * 2007-05-31 2008-12-05 Arjowiggins Licensing Soc Par Feuille de papier transparente ou translucide, son procede de fabrication et emballage le contenant
WO2013026788A3 (fr) * 2011-08-19 2014-01-16 Basf Se Sauces de couchage aqueuses à base d'urée, composants de sauces de couchage aqueux à base d'urée et leur utilisation
EP3483337A1 (fr) 2017-11-14 2019-05-15 Arjo Wiggins Fine Papers Limited Papier translucide ou transparent recyclable et repulpable à utiliser pour des applications d'emballage

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU1231094A1 (ru) * 1984-09-21 1986-05-15 Всесоюзный Научно-Исследовательский Институт Гознака Чертежна прозрачна бумага

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2916769A1 (fr) * 2007-05-31 2008-12-05 Arjowiggins Licensing Soc Par Feuille de papier transparente ou translucide, son procede de fabrication et emballage le contenant
WO2008152291A2 (fr) * 2007-05-31 2008-12-18 Arjowiggins Licensing Feuille de papier transparente ou translucide, son procede de fabrication et emballage le contenant
WO2008152291A3 (fr) * 2007-05-31 2009-03-19 Arjowiggins Licensing Sas Feuille de papier transparente ou translucide, son procede de fabrication et emballage le contenant
WO2013026788A3 (fr) * 2011-08-19 2014-01-16 Basf Se Sauces de couchage aqueuses à base d'urée, composants de sauces de couchage aqueux à base d'urée et leur utilisation
EP3483337A1 (fr) 2017-11-14 2019-05-15 Arjo Wiggins Fine Papers Limited Papier translucide ou transparent recyclable et repulpable à utiliser pour des applications d'emballage
WO2019096848A1 (fr) 2017-11-14 2019-05-23 Arjo Wiggins Fine Papers Limited Utilisation de papier translucide ou transparent recyclable et retriturable dans des applications d'emballage

Also Published As

Publication number Publication date
GB0125605D0 (en) 2001-12-19
EP1306484A3 (fr) 2004-09-29

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