Method for preparing of secondary filament from corrugated cardboard in the course of manufacture of fibrous materials

FIELD: manufacture of fibrous materials, in particular, cardboard.

SUBSTANCE: method involves first subjecting secondary filament-waste paper to breaking-up procedure in hydraulic breaker at temperature of 37-390C and pulp concentration of 2-4%, followed by processing in thermal dispersion apparatus at temperature of 38-550C and pulp concentration of 10-12%.

EFFECT: improved physico-mechanical properties of fibrous materials produced and reduced power consumption.

1 tbl, 5 ex

 

The present invention relates to the preparation of secondary fiber and can be used in the manufacture of fibrous material, preferably cardboard.

There is a method of preparation of secondary fiber from recycled paper (newsprint, book and magazine paper, SC paper with offset printing), including the dissolution of the waste paper in the pulper at a temperature of 40°and concentration of 15% and subsequent processing in termovision installation at a temperature of 65-95° (SAGGI Century, Gernac Y., Galland G. “Comparison processing of wastepaper pulp in the dispersant and brahmanah”, Res. Forum Recycl, Quebec, Oct. 7-9, 1997, Prepr-Montreal, 1997, 47-57).

This method provides satisfactory razvlechenie secondary intermediate product. However, hydration of the cellulose fibers having an exothermic in nature, an increasing temperature during processing in termovision installation (65-95° (C) leads to a decrease in strength of the resulting carton.

The closest analogue of the described invention is a method for the preparation of secondary fiber in the manufacture of cardboard, including the dissolution of the waste paper in the pulper and its subsequent processing in termovision installation (EP, 0967321 A1, D 21 5/02, 29.12.1999).

According to this method, the pulping is carried out in the pulper, and the processing in termovision ustanovkami a temperature of 60-90° C, the concentration of the fibrous suspension is 15-30%.

After pulping it is subjected to flotation at a temperature of 40-70°and the concentration of 0.5-2.0%.

However, this method does not allow to obtain a fibrous material (cardboard and paper) with high physical-mechanical properties (breaking force, the resistance to punching shear, tensile fracture with multiple bends, destructive force at the compression rings), as the processing of recycled fiber in termovision installation at a temperature of 60-90°and the concentration of the fibrous suspension to at least 15% leads to the twisting of the fibers. In addition, this method leads to increased consumption of electricity.

New technical result from the use of the present invention is the improvement of physico-mechanical properties of the obtained fibrous materials while reducing energy consumption.

Specified new technical result is achieved in that in the method of preparing secondary fibers of the corrugated cardboard in the manufacture of fibrous materials, including the dissolution of secondary fiber in the pulper and its subsequent processing in termovision installation according to the invention the dissolution of the fibers in the pulper is carried out at a temperature of 37-39°and the concentration of the mass of 2-4%, and processing termovision installation is carried out at a temperature 38-55°and the concentration of 10-12%.

As a result of implementation of the method of preparation of secondary fiber is increased such important physico-mechanical properties of paper and cardboard, as the resistance to punching shear, tensile fracture during repeated bending, breaking force and breaking force when the compression ring.

Due to the combination of the proposed method, the temperature regime of processing recycled fiber and concentration values in the pulper and termovision installation is quality razvlechenie and maximum recovery boomgaarden properties of recycled fibers, which leads to the improvement of physical and mechanical properties of fibrous materials.

The invention is illustrated by the following examples of its implementation.

Example 1. For laboratory research use recycled fiber-paper stamps MS 5B GOST 10700 (corrugated boxes).

The preparation of the paper is as follows. Waste paper dissolving in the pulper, for 15 minutes at a water temperature of 37°and the concentration of 4%. Next paper weight after thickening to a concentration of 10% was processed in the laboratory termovision installation at a temperature of 38°C. specifications laboratory is atorney termovision facility is presented below:

The working volume of the device - 0.7 l;

Drive motor:

type IV,

- power - 0.75 kW,

- speed - 1500 rpm,

- worm gear type RP-80,

- gear ratio = 41.

Before forming the received waste mass is served in a laboratory mixer, where it is diluted to a concentration of 0.6%. The duration of mixing in a laboratory stirrer for at least 10 minutes. Ebb experimental samples with a weight of 100 g/m2exercise apparatus “rapid-Köthen”. The obtained samples have the following standard methods:

GOST 13199-88 “Semi-fibrous, paper and cardboard. The method of determining the mass of products with an area of 1 m2”;

GOST ISO 1924.1-96 “Paper and cardboard. Determination of tensile strength. Part 1. Method of loading with constant speed”;

GOST 13525.8-86 “fibrous Semi-finished products and paper. Method for determining the resistance to punching”.

Paper. Determination of fracture toughness with multiple bends, GOST ISO 5626-97. Testing is carried out according to the method of the Shopper.

The test results of the experimental designs presented in the table.

Example 2.

The preparation of the paper is as follows. Waste paper dissolving in the pulper, for 15 minutes at a water temperature of 39°and a concentration of 2%. Then waste a lot of pic is e thickening to a concentration of 12% was processed in the laboratory termovision installation at a temperature of 55° C.

Before forming the received waste mass is served in a laboratory mixer, where it is diluted to a concentration of 0.6%. The duration of mixing in a laboratory stirrer for at least 10 minutes. Ebb experimental samples with a weight of 100 g/m2exercise apparatus “rapid-Köthen”.

The test results of the experimental designs presented in the table.

Example 3.

The preparation of the paper is as follows. Waste paper dissolving in the pulper, for 15 minutes at a water temperature of 38°and the concentration of 3%. Next paper weight after thickening to a concentration of 11% was processed in the laboratory termovision installation at a temperature of 46°C.

Before forming the received waste mass is served in a laboratory mixer, where it is diluted to a concentration of 0.6%. The duration of mixing in a laboratory stirrer for at least 10 minutes. Ebb experimental samples with a weight of 100 g/m2exercise apparatus “rapid-Köthen”.

The test results of the experimental designs presented in the table.

Example 4 (the prototype).

The preparation of the paper is as follows. Waste paper dissolving in the pulper, then it is subjected to flotation at a concentration of 1% and a temperature of 40°C for 2 minutes. Then waste a lot of pic is e thickening to a concentration of 15% was processed in the laboratory termovision installation at a temperature of 60° C.

Before forming the received waste mass is served in a laboratory mixer, where it is diluted to a concentration of 0.6%. The duration of mixing in a laboratory stirrer for at least 10 minutes. Ebb experimental samples with a weight of 100 g/m2exercise apparatus “rapid-Köthen”.

The test results of the experimental designs presented in the table.

Example 5 (the prototype).

The preparation of the paper is as follows. Waste paper dissolving in the pulper, then it is subjected to flotation at a concentration of 1.5% and a temperature of 60°C for 2 minutes. Next paper weight after thickening to a concentration of 25% was processed in the laboratory termovision installation at a temperature of 90°C.

Before forming the received waste mass is served in a laboratory mixer, where it is diluted to a concentration of 0.6%. The duration of mixing in a laboratory stirrer for at least 10 minutes. Ebb experimental samples with a weight of 100 g/m2exercise apparatus “rapid-Köthen”.

The test results of the experimental designs presented in the table.

Table
Number exampleThe temperature in the pulper, °The temperature in thermometers the Onna installation °The mass of 1 m2gBreaking force, NResistance to punching shear, kPaTensile fracture, the number of double foldsDestructive force at the compression ring N
13738101,173,0271276107
23955100,073,3273271107
3384699,573,1271272106
4406099,270,1268234102
5409099,866,0260176100

As can be seen from the table, the proposed method can significantly improve physical and mechanical properties of fibrous materials, namely, maximizing the destructive efforts by 11%, the resistance to bursting - at 5%, the tensile fracture with multiple kinks - 57%, destructive force when the compression ring is 7%.

The method of preparation of secondary fiber from corrugated cardboard p and the manufacture of fibrous materials, including the dissolution of secondary fiber in the pulper and its subsequent processing in thermodispersion installation, characterized in that the dissolution of the fibers in the pulper is carried out at a temperature of 37-39°and the mass concentration of 2-4%, and the processing in termovision installation is carried out at a temperature 38-55°and the concentration of 10-12%.



 

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FIELD: manufacture of fibrous materials, in particular, cardboard.

SUBSTANCE: method involves first subjecting secondary filament-waste paper to breaking-up procedure in hydraulic breaker at temperature of 37-390C and pulp concentration of 2-4%, followed by processing in thermal dispersion apparatus at temperature of 38-550C and pulp concentration of 10-12%.

EFFECT: improved physico-mechanical properties of fibrous materials produced and reduced power consumption.

1 tbl, 5 ex

FIELD: manufacture of fibrous materials, in particular, cardboard.

SUBSTANCE: method involves first subjecting secondary filament-waste paper to breaking-up procedure in hydraulic breaker at temperature of 37-390C and pulp concentration of 2-4%, followed by processing in thermal dispersion apparatus at temperature of 38-550C and pulp concentration of 10-12%.

EFFECT: improved physico-mechanical properties of fibrous materials produced and reduced power consumption.

1 tbl, 5 ex

FIELD: paper-and-pulp industry.

SUBSTANCE: process of invention is intended for use in paper-and-pulp industry, e.g. in manufacture if paper and cardboard, and is implemented as follows. Jute fibers are impregnated for 5-15 min with alkali solution containing NaOH and Na2CO3 (1:1) at common N2O consumption 2-4% based on the weight of absolutely dry raw material at temperature 90-120°C. Treated raw material in hot state is transferred together with reagent solution into heated grinding barrels of centrifugal grinding apparatus and ground therein to grinding degree ˜60 degrees of Shopper-Riegler.

EFFECT: increased yield and mechanical strength of intermediate product and reduced environmental pollution.

FIELD: technological processes.

SUBSTANCE: particles of printing inks in fibrous suspension in floatation chamber are taken away with the help of gas bubbles, at that carry-over is realised by removal of produced foam into tray for foam. Amount of removed foam is established by the following operations: measurement of inlet whiteness of delivered fibrous suspension, definition of control action as function of inlet whiteness and prescribed specified value for whiteness of removed fibrous suspension acceptance, definition of removed foam amount depending on control action.

EFFECT: invention makes it possible to realise automatic control of whiteness for removal of printing inks.

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