EP2307616A2 - White, brilliant white and coloured transparent papers comprising secondary or postconsumer waste fibres (pcw fibres) in proportions up to 100% - Google Patents

White, brilliant white and coloured transparent papers comprising secondary or postconsumer waste fibres (pcw fibres) in proportions up to 100%

Info

Publication number
EP2307616A2
EP2307616A2 EP09777087A EP09777087A EP2307616A2 EP 2307616 A2 EP2307616 A2 EP 2307616A2 EP 09777087 A EP09777087 A EP 09777087A EP 09777087 A EP09777087 A EP 09777087A EP 2307616 A2 EP2307616 A2 EP 2307616A2
Authority
EP
European Patent Office
Prior art keywords
fibres
transparent paper
transparent
fibre
paper according
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.)
Withdrawn
Application number
EP09777087A
Other languages
German (de)
French (fr)
Inventor
Karen BÖNSCH
Walter Grasmeier
Udo Raumann
Alfred Triebel
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.)
Reflex Premium Papier AG
Original Assignee
M Real Oyj
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 M Real Oyj filed Critical M Real Oyj
Publication of EP2307616A2 publication Critical patent/EP2307616A2/en
Withdrawn legal-status Critical Current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
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/06—Vegetable or imitation parchment; Glassine paper
    • 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
    • D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
    • D21H11/14—Secondary fibres
    • 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
    • D21H15/00—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution
    • D21H15/02—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution characterised by configuration

Definitions

  • PCW fibres secondary or postconsumer waste fibres
  • the present invention relates to the use of secondary fibres for the production of white, brilliant white and coloured transparent papers .
  • the paper grade serves as a general term for distinguishing between papers of different composition, manufacture and hence appearance and mode of use.
  • grading of paper by trade names and common names is effected according to origin of material, manufacture, degree of finishing and/or subsequent main use. Frequently, different grade names are customary for the same papers on the market. Often, a different name is also used for the same paper grade, depending on the intended use.
  • the starting materials required for the production of paper can be divided into four groups :
  • fibres e.g. groundwood, semichemical pulps, chemical pulps, other fibres
  • sizing and impregnation e.g. animal sizes, resins, paraffins, waxes, wet strength agents, functional chemicals, etc.
  • fillers e.g. kaolin, talc, gypsum, barium sulphate, chalk, titanium white, methylurea resins
  • auxiliaries e.g. water, dyes, antifoams, dispersants, retention aids, flocculants, wetting agents
  • the fibres can be divided in principle into two groups:
  • primary fibres i.e. raw materials which are used for the first time in production
  • secondary fibres recycled materials, also referred to as postconsumer waste (PCW) fibres, which are fed to the production process once again after use
  • Transparent papers are papers having high light transmittance .
  • the pulps are beaten (squeezed) in a refiner, with the result that the fibre surface is increased in size and the light transmittance (transparency) increases.
  • the primary pulps (long and/or short fibres) used for the production of a transparent paper are as a rule very resistant to beating.
  • the transparent papers thus produced have low folding endurances (less than 100 folds transversely to the running direction of the paper machine in the case of papers having a basis weight of 100 g/m 2 ) and are moreover characterized by low softness and pronounced extension and shrinkage behaviour.
  • the folding endurance is a measure of the strength of a paper. It indicates the number of double folds which a test strip has withstood before it tears. A high folding endurance is therefore important in particular when a paper is to be used in the packaging sector, for example as packing paper, envelope, etc.
  • wastepaper Before wastepaper can be used for the production of new paper, a number of preparatory steps is necessary: the wastepaper is first disintegrated in water and defibrated. The fibres are cleansed from paper- foreign parts in various steps. The fibres must then be very substantially freed from printing ink. However, it is scarcely possible to free the fibres completely from substances which reduce the transparency. Inter alia, this fact has to date prevented those skilled in the art from using secondary fibres for the production of transparent papers.
  • the present invention is based on the discovery that secondary fibres can be fibrillated with less beating in comparison with primary fibres, resulting in advantages in the draining of the stock, the extension and shrinkage, the softness and the folding endurance.
  • the production experiments with secondary fibres have shown that the shrinkage behaviour was 3% to 4% lower compared with the production with primary fibres, so that larger paper widths were permitted.
  • the use of secondary fibres for transparent papers also means the possibility of recycling fibres into the stock circulation and hence the reduction of amounts of waste and the protection of natural resources.
  • the present patent application therefore relates to a transparent paper containing secondary fibres .
  • the proportion of the secondary fibres, based on the total fibres used in the transparent paper according to the invention, may be up to 100%.
  • the proportion of secondary fibres is between 50% and 100%, based on the total fibres of the transparent paper according to the invention, particularly preferably between 70% and 90% and very particularly preferably between 80% and 90%.
  • the secondary fibres used according to the invention have an average fibre length between 0.7 mm and 1.2 mm, preferably between 0.8 mm and 1.1 mm and very particularly preferably between 0.9 mm and 1.0 mm.
  • the secondary fibres used according to the invention consist of hard- and softwood in a ratio of 40% to 80% : 60% to 20%, preferably of 50% to 70% : 50% to 30% and very particularly preferably of 60%: 40%.
  • hardwood is understood as meaning a wood having a dry density greater than or equal to 0.55 g/cm 3 and the term “softwood” is understood as meaning a wood having a dry density of less than 0.55 g/cm 3 .
  • the dry density designates the gross density of dry wood at 0% wood moisture content.
  • the present patent application also relates to the use of secondary fibres for the production of a transparent paper according to the invention.
  • the present patent application finally also relates to a process for the production of a transparent paper according to the invention.
  • the process steps following the provision of secondary fibres are in principle comparable with the process steps of the processes known in the prior art for the production of transparent papers from primary fibres.
  • a preferred process for the production of transparent papers from secondary fibres comprises the steps: a) constant part provision of secondary fibres, - optionally disintegration of the fibre bales, optionally beating of the fibre, dilution of the fibre with water, optionally dyeing, brightening, sizing, pigmentation, - heating of the fibre/water mixture to 40 0 C to
  • the sizing of the paper web can be effected with all commercially available synthetic surface sizes. Synthetic surface sizes are based, for example, on styrene acrylate copolymers, acrylate copolymers, dimeric alkylketenes, etc. Reactive dyes, substantive dyes, acid dyes and pigment colorants are used for colouring (pulp and/or surface) . Further substances for the surface preparation are, inter alia, those which optimize, for example, the inkjet, laser or indigo suitability, improve the printability or impart particular optical and/or safety-relevant properties to the paper. These auxiliaries include, inter alia, pigments, latices, PVA and natural binders (starch, CMC) .
  • Examples 1 and 2 In each case two measurement series were carried out to compare the properties of a transparent paper according to the invention (Examples 1 and 2) with those of a commercially available transparent paper (Examples Ia and 2a) .
  • the papers used for the examples differ only with regard to the respective basis weight (200 g/m 2 for Examples 1 and Ia, 100 g/m 2 for Examples 2 and 2a) .
  • the transparent papers according to the invention of Examples 1 and 2 contain secondary fibres in a proportion of 100%, based on the total fibres. These are secondary fibres having the designation "PW94FSC” from Greenfields S.A. S., Chateau-Gold, France. However, other PCW fibres can also be used.
  • the commercially available transparent papers of Examples Ia and 2a contain primary fibres in a proportion of 100%, based on the total fibres. These are the following transparent papers:
  • Table 1 summarizes the results of the measurements.
  • the measured values show that the transparency decreases slightly with the use of secondary fibres but is still in a range suitable for transparent papers. Strengths and haptic properties, however, are unexpectedly at the same level; in the case of the folding endurance, even a dramatic increase in the values is observable.
  • the transparent papers according to the invention shrink by about 3% to 4% less on average in comparison with the commercially available transparent papers.

Landscapes

  • Paper (AREA)

Abstract

The present invention relates to a transparent paper which is characterized in that the transparent paper contains secondary fibres. It furthermore relates to the use of secondary fibres for the production of transparent papers and to a process for the production thereof.

Description

White, brilliant white and coloured transparent papers comprising secondary or postconsumer waste fibres (PCW fibres) in proportions up to 100%
The present invention relates to the use of secondary fibres for the production of white, brilliant white and coloured transparent papers .
The paper grade serves as a general term for distinguishing between papers of different composition, manufacture and hence appearance and mode of use.
The grading of paper by trade names and common names is effected according to origin of material, manufacture, degree of finishing and/or subsequent main use. Frequently, different grade names are customary for the same papers on the market. Often, a different name is also used for the same paper grade, depending on the intended use.
The starting materials required for the production of paper can be divided into four groups :
fibres (e.g. groundwood, semichemical pulps, chemical pulps, other fibres), sizing and impregnation (e.g. animal sizes, resins, paraffins, waxes, wet strength agents, functional chemicals, etc.), fillers (e.g. kaolin, talc, gypsum, barium sulphate, chalk, titanium white, methylurea resins) , and auxiliaries (e.g. water, dyes, antifoams, dispersants, retention aids, flocculants, wetting agents) .
The fibres can be divided in principle into two groups:
primary fibres (i.e. raw materials which are used for the first time in production) and secondary fibres (recycled materials, also referred to as postconsumer waste (PCW) fibres, which are fed to the production process once again after use) .
Transparent papers are papers having high light transmittance . During the production, the pulps are beaten (squeezed) in a refiner, with the result that the fibre surface is increased in size and the light transmittance (transparency) increases.
The primary pulps (long and/or short fibres) used for the production of a transparent paper are as a rule very resistant to beating. With the necessary high degree of beating of fibres, the transparent papers thus produced have low folding endurances (less than 100 folds transversely to the running direction of the paper machine in the case of papers having a basis weight of 100 g/m2) and are moreover characterized by low softness and pronounced extension and shrinkage behaviour.
It was therefore an object of the present patent application to provide a transparent paper which has higher strength and softness, in particular a substantially higher folding endurance, and an improved shrinkage/extension behaviour compared with the transparent papers of the prior art with comparable haptic properties.
The folding endurance is a measure of the strength of a paper. It indicates the number of double folds which a test strip has withstood before it tears. A high folding endurance is therefore important in particular when a paper is to be used in the packaging sector, for example as packing paper, envelope, etc.
Surprisingly, it has now been found that the object is achieved by using secondary fibres for the production of transparent papers. The invention is therefore based on the surprising discovery that not only can secondary fibres be very readily used for the production of transparent paper, contrary to a known prejudice among those skilled in the art, but that the transparent papers produced from secondary fibres have improved properties even compared with customary transparent papers .
Before wastepaper can be used for the production of new paper, a number of preparatory steps is necessary: the wastepaper is first disintegrated in water and defibrated. The fibres are cleansed from paper- foreign parts in various steps. The fibres must then be very substantially freed from printing ink. However, it is scarcely possible to free the fibres completely from substances which reduce the transparency. Inter alia, this fact has to date prevented those skilled in the art from using secondary fibres for the production of transparent papers.
The present invention is based on the discovery that secondary fibres can be fibrillated with less beating in comparison with primary fibres, resulting in advantages in the draining of the stock, the extension and shrinkage, the softness and the folding endurance. The production experiments with secondary fibres have shown that the shrinkage behaviour was 3% to 4% lower compared with the production with primary fibres, so that larger paper widths were permitted. Independently of this, the use of secondary fibres for transparent papers also means the possibility of recycling fibres into the stock circulation and hence the reduction of amounts of waste and the protection of natural resources.
The present patent application therefore relates to a transparent paper containing secondary fibres . The proportion of the secondary fibres, based on the total fibres used in the transparent paper according to the invention, may be up to 100%.
In a preferred embodiment, the proportion of secondary fibres is between 50% and 100%, based on the total fibres of the transparent paper according to the invention, particularly preferably between 70% and 90% and very particularly preferably between 80% and 90%.
It has proved to be advantageous if the secondary fibres used according to the invention have an average fibre length between 0.7 mm and 1.2 mm, preferably between 0.8 mm and 1.1 mm and very particularly preferably between 0.9 mm and 1.0 mm.
It has furthermore proved to be advantageous if the secondary fibres used according to the invention consist of hard- and softwood in a ratio of 40% to 80% : 60% to 20%, preferably of 50% to 70% : 50% to 30% and very particularly preferably of 60%: 40%.
The term "hardwood" is understood as meaning a wood having a dry density greater than or equal to 0.55 g/cm3 and the term "softwood" is understood as meaning a wood having a dry density of less than 0.55 g/cm3. The dry density designates the gross density of dry wood at 0% wood moisture content.
The present patent application also relates to the use of secondary fibres for the production of a transparent paper according to the invention.
The present patent application finally also relates to a process for the production of a transparent paper according to the invention. The process steps following the provision of secondary fibres are in principle comparable with the process steps of the processes known in the prior art for the production of transparent papers from primary fibres. A preferred process for the production of transparent papers from secondary fibres comprises the steps: a) constant part provision of secondary fibres, - optionally disintegration of the fibre bales, optionally beating of the fibre, dilution of the fibre with water, optionally dyeing, brightening, sizing, pigmentation, - heating of the fibre/water mixture to 400C to
950C, preferably 65°C to 85°C and particularly preferably to 75°C to 850C, distribution of the fibre/water mixture to give a paper web on a wire, - drainage of the fibre web by means of natural and artificial vacuum and pressure, predrying of the paper web to a residual moisture content of 30% to 50%, pressing of the paper web by means of a moisture press, intermediate drying of the paper web to a residual moisture content of 2% to 8%, b) surface preparation optional finishing by means of a surface preparation (dyeing, brightening, sizing, pigmentation, surface formulations for establishing specific properties) , drying of the transparent paper to a residual moisture content of 4% to 10%, preferably 6% to 8%, optionally additional smoothing or embossing.
The sizing of the paper web can be effected with all commercially available synthetic surface sizes. Synthetic surface sizes are based, for example, on styrene acrylate copolymers, acrylate copolymers, dimeric alkylketenes, etc. Reactive dyes, substantive dyes, acid dyes and pigment colorants are used for colouring (pulp and/or surface) . Further substances for the surface preparation are, inter alia, those which optimize, for example, the inkjet, laser or indigo suitability, improve the printability or impart particular optical and/or safety-relevant properties to the paper. These auxiliaries include, inter alia, pigments, latices, PVA and natural binders (starch, CMC) .
It has proved to be advantageous if, after the disintegration of the fibres, the fibre length is monitored during the beating process and, if required, adjusted by suitable energy input.
The present invention is explained in more detail below with reference to examples:
In each case two measurement series were carried out to compare the properties of a transparent paper according to the invention (Examples 1 and 2) with those of a commercially available transparent paper (Examples Ia and 2a) . The papers used for the examples differ only with regard to the respective basis weight (200 g/m2 for Examples 1 and Ia, 100 g/m2 for Examples 2 and 2a) .
The transparent papers according to the invention of Examples 1 and 2 contain secondary fibres in a proportion of 100%, based on the total fibres. These are secondary fibres having the designation "PW94FSC" from Greenfields S.A. S., Chateau-Thierry, France. However, other PCW fibres can also be used.
The commercially available transparent papers of Examples Ia and 2a contain primary fibres in a proportion of 100%, based on the total fibres. These are the following transparent papers:
Zanders T 2000 in the stated basis weights. The measured values for the individual transparent papers were determined by the following methods of measurement :
Methods of measurement
DIN ISO
Determination of the resistance to 53121 2493 bending:
Determination of the breaking load: 53112 1924-2
Determination of the Mullen bursting 53141 2759-2 pressure :
Determination of the Schopper folding 5626 endurance :
Determination of the coefficient of 53119-1 friction:
Determination of the Bekk smoothness: 53107 5627
Determination of the transparency: 53147 22891
Table 1 summarizes the results of the measurements. The measured values show that the transparency decreases slightly with the use of secondary fibres but is still in a range suitable for transparent papers. Strengths and haptic properties, however, are unexpectedly at the same level; in the case of the folding endurance, even a dramatic increase in the values is observable. On the paper machine, it is found that the transparent papers according to the invention shrink by about 3% to 4% less on average in comparison with the commercially available transparent papers.

Claims

Patent claims
1. Transparent paper, characterized in that the transparent paper contains secondary fibres.
2. Transparent paper according to Claim 1, characterized in that the proportion of secondary fibres is between 50 and 100%, based on the total fibres of the transparent paper.
3. Transparent paper according to Claim 1, characterized in that the proportion of secondary fibres is between 70 and 90%, based on the total fibres of the transparent paper.
4. Transparent paper according to Claim 1, characterized in that the proportion of secondary fibres is between 80 and 90%, based on the total fibres of the transparent paper.
5. Transparent paper according to at least one of Claims 1 to 4, characterized in that the secondary fibres have an average fibre length between 0.7 mm and 1.2 mm.
6. Transparent paper according to at least one of Claims 1 to 4, characterized in that the secondary fibres have an average fibre length between 0.8 mm and 1.1 mm.
7. Transparent paper according to at least one of Claims 1 to 4, characterized in that the secondary fibres have an average fibre length between 0.9 mm and 1.0 mm.
8. Transparent paper according to at least one of Claims 1 to 7, characterized in that the secondary fibres consist of hard- and softwood in a ratio of 40% to 80% : 60% to 20%.
9. Transparent paper according to at least one of Claims 1 to 7, characterized in that the secondary- fibres consist of hard- and softwood in a ratio of 50% to 70% : 50% to 30%.
10. Transparent paper according to at least one of Claims 1 to 7, characterized in that the secondary fibres consist of hard- and softwood in a ratio of 60%:40%.
11. Process for the production of a transparent paper according to at least one of Claims 1 to 10.
12. Process according to Claim 11, comprising the steps : provision of secondary fibres, optionally disintegration of the fibres, optionally beating of the fibre, - dilution of the fibre with water, optionally dyeing, brightening, sizing, pigmentation, heating of the fibre/water mixture to 400C to
95°C, - distribution of the fibre/water mixture to give a paper web on a wire, drainage of the fibre web by means of natural and artificial vacuum and pressure, predrying of the paper web to a residual moisture content of 30% to 50%, pressing of the paper web by means of a moisture press , intermediate drying of the paper web to a residual moisture content of 2% to 8%, - optional finishing by means of a surface preparation (dyeing, brightening, sizing, pigmentation, surface formulations for establishing specific properties) , drying of the transparent paper to a residual moisture content of 4% to 10%, optionally additional smoothing or embossing.
13. Process according to Claim 12, characterized in that, after the disintegration of the fibre bales, the fibre length is monitored during the beating process and is adjusted by suitable energy input.
14. Use of secondary fibres for the production of a transparent paper according to at least one of Claims 1 to 10.
15. Use of a transparent paper according to at least one of Claims 1 to 10 for envelopes, as craft paper, for brochures and/or interleaves for brochures, for inkjet and laser applications, as writing and printing material .
EP09777087A 2008-08-01 2009-07-10 White, brilliant white and coloured transparent papers comprising secondary or postconsumer waste fibres (pcw fibres) in proportions up to 100% Withdrawn EP2307616A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200810035864 DE102008035864A1 (en) 2008-08-01 2008-08-01 White, high white and colored transparent papers with secondary or post consumer waste (PCW fibers) of up to 100%
PCT/EP2009/005002 WO2010012365A2 (en) 2008-08-01 2009-07-10 White, brilliant white and coloured transparent papers comprising secondary or postconsumer waste fibres (pcw fibres) in proportions up to 100%

Publications (1)

Publication Number Publication Date
EP2307616A2 true EP2307616A2 (en) 2011-04-13

Family

ID=41461573

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09777087A Withdrawn EP2307616A2 (en) 2008-08-01 2009-07-10 White, brilliant white and coloured transparent papers comprising secondary or postconsumer waste fibres (pcw fibres) in proportions up to 100%

Country Status (3)

Country Link
EP (1) EP2307616A2 (en)
DE (1) DE102008035864A1 (en)
WO (1) WO2010012365A2 (en)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2133406A1 (en) * 1992-04-23 1993-11-11 Xuan Truong Nguyen Wood-free pulp and white paper product
JP2000185801A (en) * 1998-12-21 2000-07-04 Yoshinori Shimazaki Drawstring-purse-type waterproof transparent paper made refuse collecting bag formed from environment friendly recycled paper
DE19910064B4 (en) * 1999-02-22 2009-10-22 Schwedt Papier & Karton Gmbh Coated corrugated cardboard overlay paper of graphic quality on waste paper basis and method for its production
JP2005280338A (en) * 2004-03-04 2005-10-13 Oji Paper Co Ltd Inkjet recording paper
JP5041505B2 (en) * 2005-07-29 2012-10-03 北越紀州製紙株式会社 Transparent paper base paper

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2010012365A3 *

Also Published As

Publication number Publication date
DE102008035864A1 (en) 2010-02-04
WO2010012365A3 (en) 2010-04-01
WO2010012365A2 (en) 2010-02-04

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