SU554337A1 - Method of making filterboard - Google Patents

Description

(54) METHOD OF MANUFACTURING FILTER-CARDBOARD

one

The invention relates to pulp and paper production and can be used in the food industry to filter wines, beer, and other liquids.

A cardboard for filtering wines is known, the composition of which includes cellulose, asbestos and diatomite.

However, upon contact with the filtered liquids, the cardboard formed from the mass of the indicated composition absorbs a large amount of moisture, as a result of which the fibers contained in it swell. This leads to a decrease in the specific throughput of the cardboard, a sharp decrease in its mechanical-. combustibility, washing out individual fibers and filler particles from it, which worsens the presentation of the filtered products, leads to increased consumption of cardboard and significant loss of filtrate.

There is a method of increasing the mechanical strength of cardboard by surface treatment of a wet cardboard sheet with an aqueous solution of POLYVINYL alcohol.

The disadvantage of this method is that α-polyvinyl alcohol cannot be used for processing the cardboard intended for filtering food liquids, due to the large washout of the polymer into the medium being filtered (wine, juice, etc.), which causes a large o-acidity filtrate.

In order to improve the filtering properties of cardboard by reducing lint in the process of filtering food liquids by the proposed method, cartops are treated with an aqueous dispersion of vinyl vinylidene chloride latex with 65% vinylidene chloride content in the amount of 1-6% by weight of a- absolutely dry fiber with a dryness of 45--60% .

Such surface treatment with an aqueous latex dispersion makes it possible to obtain a cardboard with a high mechanical strength in the wet state, to exclude in the process of filtration lint and leaching of filler particles into the filtrate, and therefore to improve the filtering properties of the cardboard and the quality of filtered liquids.

Cardboard samples are obtained in the laboratory according to a known reflux regime. The latex of the brand VHVD-65 in the form of an aqueous dispersion is applied on the surface of cardboard samples with a dryness of 40-60% in an amount of 1-6% by weight of absolutely dry fiber.

Samples of cardboard tested in the laboratory.

Moscow winery "Samtrest when filtering wines. Test data are given in the table.

It can be seen from the table that a cardboard that is coated with an aqueous dispersion of latex is much more durable than a similar cardboard.

without coating. The resistance to bursting in the wet state reaches 0.9-1.2 kg / cm — versus 0.03 kg / cm for uncoated cardboard. Increasing the strength of cardboard in the state helps to reduce the washout of fibers and filler particles from it. The turbidity of wine filtered through coated cardboard is reduced to 0.110-0.087 formazine units versus 0.122-0.150 for wine filtered through uncoated cardboard.

Tasting the filtered wine showed that the aqueous dispersion of latex does not affect the organoleptic properties of the wine.

The introduction of the proposal into production will not require large expenditures associated with the modernization of the old or the need for new equipment. For example, a size press can be used to coat the cardboard.

Claims (1)

Invention Formula A method of manufacturing a filter board by surface treatment of a wet cardboard sheet, characterized in that, in order to reduce lint during filtration of liquid liquids, the surface treatment of the cardboard sheet is carried out by aqueous vinyl vinylidene latex with 65% of vinylidene chloride in an amount of 1-6% by weight absolutely dry fiber with a dry cloth 45-60%.