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Filler for the manufacture of base paper and method for the manufacture of base paper

a technology of base paper and filler, which is applied in the field of filler for the manufacture of base paper, can solve the problems of not being able to use calcium carbonate, paper is subjected to a force that tends to crack paper, and pcc pigments have not achieved particular success, etc., to achieve good internal strength and density, improve light scattering and opacity, and low base weight

Inactive Publication Date: 2004-12-23
M REAL OYJ
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0015] An object of the invention is to provide a method for the manufacture of base paper, in particular for the manufacture of thin base paper, by means of which a base paper is obtained that has a low basis weight, a good internal strength and density, as well as improved light-scattering and opacity.

Problems solved by technology

Thin base papers are traditionally manufactured in acidic conditions, wherein it is not possible to use calcium carbonates but other compounds, and thus PCC and GCC are used mainly in fine papers.
In sheet-fed offset, the requirement for strength is caused by the fact that printing inks are very viscous and, at the outlet side of the printing nip, the paper is subjected to a force that tends to crack the paper.
However, the PCC pigments have not achieved any particular success as fillers of thin base papers.
In addition, density naturally deteriorates, i.e. decreases when the basis weight is reduced.
A problem with known PCC fillers is that they do not meet simultaneously all the requirements associated with the manufacture of thin base paper.
Typically, the brightness and opacity of the base paper may be high but, at the same time, the bonding strength of the base paper has decreased to an alarming extent and its density has deteriorated such that the coating colour has penetrated into the base paper.

Method used

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  • Filler for the manufacture of base paper and method for the manufacture of base paper
  • Filler for the manufacture of base paper and method for the manufacture of base paper

Examples

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Effect test

example 1

[0039] Laboratory Tests with Different Fillers

[0040] In a series of tests, laboratory sheets were produced on a Formette Dynamique sheet mould. The fibre pulps, broke and different fillers described below were used at test points. A standard amount of retention agents and starch was also used.

[0041] The following fibre pulps were used in the tests:

[0042] Nordic bleached chemical softwood pulp, which was refined to an SR number of 24 on an Escher Wyss laboratory refiner;

[0043] bleached CTMP containing 85% aspen and 15% spruce, which was refined to a CSF value of 48 ml on a Voith Sulzer laboratory refiner (consistency 4.2%, specific edge load 0.3 J / m, specific energy consumption 90 kWh / t). The fibre distribution of the pulp and its most important paper technical values measured from laboratory sheet were:

[0044] length-weighted fibre length: 0.69 mm

[0045] McNett classification +28 mesh: 3.3%

[0046] McNett classification {fraction (28 / 48)} mesh: 39.4%

[0047] McNett classification {fractio...

example 2

[0060] Manufacture of Base Paper on a Pilot Paper Machine as Well as its Coating and Calendaring

[0061] The following fibre pulps were used in tests:

[0062] mill-ground Nordic bleached chemical softwood pulp,

[0063] bleached CTMP containing 85% aspen and 15% spruce, which was after-refined on a pilot-scale refiner with a low specific edge load while the specific energy consumption was 140 kWh / t. Before the after-refining, the CSF of the pulp was 115 ml. After the after-refining, the most important properties of the pulp and laboratory sheets were:

[0064] CSF 59 ml

[0065] length-weighted fibre length 0.73 mm

[0066] McNett classification +16 mesh: 0.0%

[0067] McNett classification {fraction (16 / 30)} mesh: 5.4%

[0068] McNett classification {fraction (30 / 50)} mesh: 31.3%

[0069] McNett classification {fraction (50 / 200)} mesh: 34.1%

[0070] McNett classification -200 mesh: 29.1%

[0071] brightness 78.6

[0072] tensile index 46.7 Nm / g

[0073] tear index 3.9 mNm.sup.2 / g

[0074] density 570 kg / m.sup.3 (bulk 1....

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Abstract

The invention relates to the use of precipitated calcium carbonates (PCC) as fillers for the manufacture of base paper together with mechanical hardwood pulp and chemical softwood pulp, and to a method for the manufacture of base paper, in which method pulp produced from hard woods, in particular from the wood of the genus Populus, and chemical softwood pulp are used together with a PCC filler. The use of precipitated calcium carbonate (PCC) for the manufacture of base paper together with mechanical hardwood pulp and chemical softwood pulp is characterized in that >=20 wt-% of the fibres of the mechanical hardwood pulp is included in the fibre size fraction of <200 mesh and 10-40 wt-% of them is included in the fibre size fraction of {fraction (28 / 48 mesh, the brightness of the mechanical hardwood pulp is >=75, the particle size distribution of the precipitated calcium carbonate is 90%<=9 mum, 50%<=5 mum and 20%<=1.5 mum, and the basis weight of the base paper is 25-150 g / m<2>.

Description

[0001] The present invention relates to the use of precipitated calcium carbonates (PCC) as fillers for the manufacture of base paper together with mechanical hardwood pulp and chemical softwood pulp, and to a method for the manufacture of base paper, in which method pulp produced from hard woods, in particular from the wood of the genus Populus, and chemical softwood pulp are used together with a PCC filler.PIOR ART[0002] In base papers, in particular in thin base papers, kaolins and ground calcium carbonates (GCC) are used as fillers. Thin base papers are traditionally manufactured in acidic conditions, wherein it is not possible to use calcium carbonates but other compounds, and thus PCC and GCC are used mainly in fine papers.[0003] In coated base papers, the paper must be dense in order that coating colour shall stay on the surface of the paper forming a well-covering layer and shall not be able to penetrate into the base paper during the coating process. In order that coated pa...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): D21H11/02D21H17/67D21H11/10D21H21/52
CPCD21H11/02D21H17/675D21H21/52
Inventor LESKELA, MARKKUNYGARD, STINAPAULER-JOHANSSON, GUDRUNPITAKANEN, MAIJAANAS, EEVA
Owner M REAL OYJ
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