Fluting paper and packaging using paper

 

(57) Abstract:

Fluting paper is intended for the production of packaging and can be used in the pulp and paper industry. The paper consists of a fibrous material containing waste paper, prefabricated high output, and the coating applied in the sizing press. As a semi high output it contains chemi-thermomechanical mass with the degree of grinding 40-SR. The latter is obtained by two-stage chemical treatment with sodium hydroxide solution with simultaneous steaming in a screw machine. As the paper it contains a paper with the degree of grinding 50-SR when a predetermined ratio of these materials. The coating weight is 0.2-2.5 g/m2. Also proposed container using the above paper. The technical result is to increase the stiffness and strength characteristics of paper for corrugation with simultaneous optimal cost of paper and packaging. 2 S. p. f-crystals, 1 table.

The invention relates to the pulp and paper industry and can be used in the manufacture of paper for corrugated cardboard.

Known fluting paper, consisting of the 20, 15.03.93).

In addition, known fluting paper consists of a fibrous material containing 90% recycled paper and 10% unbleached sulfate pulp, and surface coating contains, in wt.%: sodium carboxymethyl cellulose 25-55 and a water-soluble salt of a copolymer of Acrylonitrile, methyl acrylate and basis of itaconic acid 45-75, and the mass of sediment is 5-6 g/m2.

A well-known paper has high strength properties at high smoothness paper.

Famous paper comprising fibrous material containing 90% bleached chemithermomechanical pulp (BCTMP and 10% bleached deinked pulp (US 6372088, class D 21 H 21/06, 16.04.2002).

Used thermo-mechanical wood pulp is white 67-68%, obtained by bleaching with a flow rate of Na2S2ABOUT4- 1.8 kg/so

Known paper has the required quality properties.

The closest analogue of the present invention is fluting paper comprising fibrous material containing waste paper, and the coating applied in the sizing press, and Tara with its use (Wochenblatt Papierfabrkation, 2002, 130, No. 4, S. 187-188).

Surface sizing of paper for corrugation provides optimum strength paper with a minimum consumption of starch glue.

However, such factors as resistance to mechanical and in-plane compression famous paper, is not high enough.

The objective of the invention is to increase stiffness and strength characteristics of paper for corrugation with simultaneous optimal cost of paper and packaging, obtained with its use, through the use of chemi-thermomechanical pulp from a mixture of birch and aspen.

A new technical result is achieved that, fluting, consisting of fibrous material containing waste paper, and the coating applied in the sizing press, according to the invention the fibrous material further comprises a prefabricated high output, which is taken chemi-thermomechanical pulp with a beating degree of 40-SR obtained by two-stage chemical treatment with sodium hydroxide solution with simultaneous steaming in a screw machine, and the paper he soda is Paper 60-65

Chemi-thermomechanical

wood pulp 35-40

the coating weight is 0.2-2.5 g/m2.

Packaging is carried out using corrugated paper according to a standard technique by alternating glued together flat and corrugated layers.

When this chemical-thermo-mechanical wood pulp is prepared from a mixture of birch and aspen in a single screw apparatus in two stages, the first of which is performed by the caustic soda solution with a concentration of 20-25 g/l at the rate of 2.5-4.0% in units of Na2O by weight of absolutely dry wood chips at a temperature of 100-120, and the second stage is carried out with sodium hydroxide solution with a concentration of 26 to 30 g/l when the consumption of 4.5-5.5% in units PA2About by weight of absolutely dry wood chips at a temperature of 150-160S, and as waste paper use waste paper MC-6 - paper from used corrugated boxes and waste corrugated production.

Surface coating applied in the sizing press, has a coating weight of 0.2-2.5 g/m2preferably based on starch or sodium salt of carboxymethyl cellulose. At the same time as the cationic starch used corn or potato.

According to the authors, the combination of CTMP received in screw pozvolyaet get corrugating paper with high stiffness and mechanical properties by filling the inter-fiber paper patterns paintings tougher CTMP fibers from a mixture of wood hardwood - birch and aspen.

On the basis of the received offer fluting produce corrugated packaging, characterized by high resistance to compression, i.e., holding the load of the pile. At the same time as produce corrugated boxes complex cutting, including 4-valve and trays from gofrokartona different profiles from E to C.

We offer corrugated paper has high stiffness and strength parameters by combining in the composition of the paper CTMP with high physical-mechanical indicators with a beating degree of 40-SR and waste paper with the degree of grinding 50-SR in the claimed composition ratio, thereby reducing the density of the coating, preferably a starch-based or Na salt of carboxymethyl cellulose.

Proposed fluting paper obtained in examples 1-3, and the characteristics of the target product are presented in the table.

Example 1. The corrugating medium weight 125 g/m2get a standard technology with the only difference that:

1. the fibrous composition comprises 35% CTMP with the degree of grinding SR and 65% recycled paper brand MS-6 with the degree of grinding SR;

2. the coating weight is tea contains cationic potato starch.

CTMP receive the above technologies by two-stage chemical treatment with sodium hydroxide solution with simultaneous steaming in a screw machine.

The obtained corrugated paper analyzed to determine quality indicators.

The results are shown in the table.

Example 2. The corrugating medium weight 125 g/m2get a standard technology with the only peculiarity that:

1. the fibrous composition comprises 38% CTMP with the degree of grinding SR and 62% recycled paper brand MS-6 with the degree of grinding of 55 SR;

2. the coating weight of 1.5 g/m2;

3. the coating is deposited on one side of the paper web;

4. composition for coating contains a cationic corn starch.

The obtained corrugated paper analyzed to determine quality indicators.

The results are shown in the table.

Example 3. The corrugating medium weight 125 g/m2get a standard technology with the only peculiarity that:

1. fibrous composition consists of 40% CTMP with the degree of grinding SR and 60% recycled paper brand MS-6 with the degree of grinding SR;

2. weight pokr is left to cover contains the sodium salt of carboxymethylcellulose.

The obtained corrugated paper analyzed to determine quality indicators.

The results are shown in the table.

The analysis of the table shows that the proposed fluting on the basis of the CTMP, obtained by two-stage chemical treatment with sodium hydroxide solution with simultaneous steaming in a screw machine, has high stiffness parameters, namely, the end resistance to compression, resistance to in-plane compression with high physical-mechanical properties.

This result is achieved by the combination of the set of features included in the invention.

1. Fluting paper comprising fibrous material containing waste paper, and the coating applied in the sizing press, characterized in that the fibrous material further comprises a prefabricated high output, which is taken chemi-thermomechanical pulp with a beating degree of 40-SR obtained by two-stage chemical treatment with sodium hydroxide solution with simultaneous steaming in a screw machine, and as the paper it contains a paper with the degree of grinding 50-SR with ocrite is 0.2-2.5 g/m2.

2. Tara, characterized in that it is made using paper p. 1.

 

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