BG61167B1 - Method for obtaining paste for cigarette joints - Google Patents

Abstract

(54) METHOD OF PREPARING CIGARETTED SEAMS @ (57) 1. A method of producing adhesive for cigarette butts based on chemically modified starch, characterized in that the solid and liquid components are deposited in or sequentially overlapping. during the mixing and crushing stages are processed into water glue.

Description

TECHNICAL FIELD

The invention relates to a method of producing adhesive for cigarette stitches based on chemically modified starch.

BACKGROUND OF THE INVENTION

Modified starch based aqueous adhesive mixtures (CMS-adhesive) are described in patent application GDR WPC 09J / 31780, respectively. in the relevant application DE-A-3 914 556.5, and are used in the cigarette industry for sticking cigarette paper in the industrial production of cigarettes at a bandwidth of a maximum of 550 m / min.

The advantages of these adhesives are the high adhesive strength of the short drying time, the possibility of processing the solids content with cold water and the healthy reliability of the adhesive.

The production of SMZ-adhesive according to the method described above, in which the solid substance and the cold water must be intensively mixed with each other and the aqueous adhesive mixture must be filled in spare containers of the machine (adhesive cartridges) is not satisfactory for the industrial production of cigarettes.

After an intensive mixing process, a solid content of about 20% required for sufficient adhesive force shows a viscosity above the cutoff yield strength of γ = 1.63 at η - Pa at a mean shear load according to practice. h. Based on the stated negative liquefaction, the production of adhesive with protective technical means cannot be automated in this way. Despite intensive mixing, homogeneously dry agglomerates are dispersed in the aqueous adhesive mixture, requiring in practice an additional swelling time of 10 to 54 hours, which is indispensable in order to exclude the tearing of the adhesive film on the seam of the cigarette paper during production. . Despite the 54 h equalization process, fluctuations in the viscosity distribution of Δη = 7% were detected.

This means that the described method of adhesive production can only be implemented intermittently.

Both the mixing process and the process of filling the cartridges by hand after the adhesive swelling has taken place cannot be prevented by disturbing air entanglements at present viscosities. The need for evacuation of the filled adhesive cartridges to a final pressure of p = 50 Torr does indeed contribute to a certain reduction of air inclusions, however, complete avoidance of the disturbing air bubbles on the adhesive washer of the cigarette machine is not possible due to the previously given materials viscosities and diffusion conditions.

SUMMARY OF THE INVENTION

It is an object of the invention to provide a method which enables the continuous production of free air balloon practically water-based adhesive for cigarette seams based on chemically modified starch, which can avoid the further processing of the adhesive (evacuation of cartridges and etc.).

The process is carried out by adding one more crushing process to each mixing process after mixing the solid and cold water (T = 10-20 ° C). The combination of the mixing and crushing process results in the permanent dissolution of the agglomerates of solids while depositing solvents to the solids particles.

In addition, the alternation of the mixing and crushing process causes the gel structures to dissolve and the air bubbles involved to disintegrate. In this way, at a time t = <3 min for mixing and crushing, one ready-to-process final product is obtained. Practical results show that the viscosities of the pure blending process compared to the combination of blending and crushing processes at the same formulation and shear load are higher by a factor of 1.5.

The enabling liquid liquefaction environment thus ensured self-propelled loading into the cartridge filling device, and thus a continuous loading of the mixing components in the mixing and crushing apparatus until automated delivery of the finished adhesive from the cartridge.

This produces a finished product with excellent adhesive properties whose fluctuations in the viscosity distribution are less than 1% and whose finely distributed air inclusions have a bubble diameter of less than 100 µm.

The homogeneity, the incorporation of air into the microstructure and the relatively low viscosity of the adhesive have advantages both in the actual production and in the adhesive apparatus of the cigarette machine, such as homogeneous coating of the adhesive washer and transfer to the cigarette paper at 550 m / l tape speeds. min, and thus contribute to the quantitative and qualitative stabilization of the cigarette product.

The aqueous adhesive mixture based on chemically modified starch consists predominantly of 15 to 30 Ma-% of carboxymethyl ether of potato starch or corn starch with a degree of substitution of 0.1 to 0.25, wherein one part of the carboxyl groups of the compound are linked esterically to the hydroxyl groups of the adjacent molecules, and the free carboxyl groups are present in the form of the sodium salt.

Preferably, the ratio of the free and esterified carboxylate groups is so selected that the quasi-viscosity in the 2% aqueous solution is 500 to 4000 mPa, determined by a Hoppler ballpoint viscometer at a sliding voltage of 4.91 kPa. The total content of inorganic salts is predominantly below 2%, and the content of heavy metals and other harmful substances is lower than the food and taste limits.

EXAMPLES OF IMPLEMENTATION

For the manufacture of cigarette seam adhesive, certain amounts of powdered carboxymethyl starch and cold water (total salt content less than 1%; total hardness less than 20 ° N; temperature 20 ° C) in a ratio of 1: 5 in rotary mixing container (11 = rpm). In the semicircular arc cross section of the rotary annular mixing container are arranged tangentially to the center of the mixing container inclined with 120 ° circular blades, which in a few layers of intensive crushing and mixing process (mainly 1450 rpm) allow for 3 minutes to produce , a gel-free, practically air-free mixture of adhesives that does not need to be further processed.

The finished adhesive at a temperature of 28 ° C to 30 ° C is leakable, which guarantees the automatic removal of the adhesive mass from said mixing container into a transport auger and, practically, filling free of air bubbles into a suitable container for absorbing the adhesive (cartridge for glue).

Claims (9)

Claims CLAIMS 1. A method of producing adhesive for cigarette butts based on chemically modified starch, characterized in that the solid and liquid components are processed into water-based adhesive by applying them to or in successive mixing and crushing steps. A method according to claim 1, characterized in that the viscosity of the aqueous adhesive mixture at a solids content of preferably about 20% by weight. under ambient conditions is lower than the liquefaction limit. The method according to claims 1 and 2, characterized in that the aqueous adhesive solution after mixing time is 3 minutes at a maximum peripheral rotational speed of about 24.5 rpm and a cutting surface of 900 cm ^{2 is} acted upon. can be applied immediately thereafter, without a degree of additional swelling, such as cigarette seam adhesive. A method according to claims 1 to 3, characterized in that the mixing and crushing is carried out so intensely that the fluctuations in the viscosity distribution immediately after filling the adhesive cartridge are lower than about 1%. The method according to claims 1 to 4, characterized in that the inclusions of air in the aqueous adhesive solution have a bubble diameter of d <100 pc. The method according to claims 1 to 5, characterized in that the operations of the method for preparing the adhesive for filling the adhesive cartridge are carried out at a continuous flow of material. The method according to claims 1 to 6, characterized in that the adhesive for cigarette seams is made on the basis of chemically modified starch from 15 to 30% by weight. of carboxymethyl ether of potato starch or corn starch with a degree of substitution of 0.1 to 0.25, wherein part of the carboxyl groups of the coupling are combined 5 esterally with the hydroxyl groups of adjacent molecules and the free carboxyl groups are available in the form of sodium salt. A method according to claim 7, characterized in that the ratio between The 10 d free and esterified carboxylate groups were selected such that in the 2% aqueous solution the quasi-viscosity was from 500 to 4000 mPa as determined by a Hoppler ball-stick viscometer at a shear stress of 4.91 kPa. The method according to claims 7 and 8, characterized in that the total content of inorganic salts is preferably less than 2% and the content of heavy metals and other harmful substances is lower than the acceptable limits for nutrients and consumables.