SU445717A1 - The composition of the paper pulp - Google Patents

Description

one

The invention relates to the pulp and paper industry.

Known paper pulp for making paper used as a carrier of information in electronic computers is included, and sulphite bleached pulp, sizing agent and filler.

However, paper made from this mass is unsuitable for use in electronic reading machines of electronic computers. This is due to the low microgeometry of the paper surface.

For the purpose of making paper suitable for use in optical machines of electronic computers, a paper pulp composition is proposed that further comprises sulphate pulp in the following ratio of components (in weight%):

Sulfite Blebane Cellulose28-45

Sulphate henbenan pulp45--64

Sizing agent 2,5-3

Filler 5, 5, 7,

and the sizing agent consists of rosin glue and melamine formaldehyde resin, taken in a ratio of 1: 1.5-1.5: 2. For making paper of the proposed

the composition of the cellulose sulfate and sulfite grind separately in the presence of a filler, for example titanium dioxide. Sulphate pulp is ground to 45-50 ° SR,

and sulphite - up to 42-45 ° ShR with fiber length of both celluloses 50-bC. A lot of glue rosin glue. Melamine formaldehyde resin is introduced into the mass after the glue during the grinding process or before the pressure head.

box. The paper is poured on a net table with an equalizer. The drying and finishing of the paper is carried out according to the specifications for glued papers.

Example 1

950 kg of sulphate bleached pulp, ground to 45-50 ° SHR, is mixed with 550 kg of bleached sulphite pulp, ground to 42-45 ° SHR in the presence of titanium dioxide, taken in an amount of 90 kg. The prepared mass is glued with rosin glue, in the amount of 15 kg, and then - melamine-formaldehyde resin in the amount of 22.5 kg. Example 2

750 kg of sulphate bleached pulp ground 45-50 ° SHR in the presence of titanium dioxide, injected in an amount of 120 kg, is mixed with 750 kg bleached sulphite pulp ground up to 42-45 ° ShR. The sizing agent is prepared from rosin

glue and melamine formaldehyde resin, taken respectively in the amount of 22.5 and 30 kg.

Example 3

1030 kg of sulphate bleached pulp ground to 45-50 ° SHR in the presence of titanium dioxide, introduced in an amount of 105 kg, is mixed with 470 kg of sulfite cellulose ground to 42-45 ° ShR. Glue a weight of 22.5 kg of rosin glue.

Before overlapping the mass, 30 kg of melamine-formaldehyde resin are introduced into the grid of the paper machine.

The paper is dried out, dried and finished in the usual ways used for glued paper.

Paper made from the proposed mass has the following characteristics:

Microgeometry of paper surface, determined by the method of reflection,% 8.2

Explosive load on average in two directions, kgf7.0

Kink - the number of double kinks on average in two directions 930

The tearing on average in two directions, g114.

Subject invention

1. A paper pulp composition for making paper used as an information carrier in electronic computers, including bleached sulphite pulp, a sizing agent and filler, characterized in that, in order to make paper suitable for use in electronic reading machines of electronic computing machines, the composition additionally contains sulphate pulp in the following ratio of components (in wt.%):

Sulfite Blebane Cellulose28-45

Sulphate henbane cellulose 45-64

Sizing agent 2,5-3

The filler is 5.5-7.

2. Composition according to c. 1, characterized in that the sizing agent contains rosin glue and melamine formaldehyde 25 resin in a ratio of 1: 1.5 to 1.5: 2.