Plastic and nonmetallic article shaping or treating: processes – With severing – removing material from preform mechanically,... – To form particulate product
Patent
1991-05-20
1992-10-27
Woo, Jay H.
Plastic and nonmetallic article shaping or treating: processes
With severing, removing material from preform mechanically,...
To form particulate product
264142, 425198, 425308, 425311, 4253824, 425464, 425DIG230, B29B 906
Patent
active
051587300
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a device for the granulation of a plastic molding compound which does not flow under gravity, more particularly an enzyme concentrate suitable for detergents, comprising a granulating head which adjoins an extruder and which comprises a number of bore-like passages on its outlet side and a preliminary distributor in the form of a perforated plate arranged at a distance from the extruder screw and the bore-like passages on the extruder side.
Modern detergents contain enzyme granules, for example proteases, amylases, lipases. In the production of enzyme granules, it is important to obtain a dust-free product of homogeneous composition and uniform external appearance, including shape, color and general appearance. Since granules of the type in question must not disintegrate in the detergent powder, their particle sizes have to be comparable with the other granules. Accordingly, die plates having bore diameters of less than 0.8 mm have to be used where an extruder is employed for granulation.
Enzyme granules consist not only of the liquid enzyme concentrates, but also of fillers, zeolites, tripolyphosphates, starch, cellulose, methyl cellulose, carboxymethyl cellulose, waxes, water-soluble polymers, etc.
Another problem is the uniform distribution of the compound to be processed over the entire cross-section of the molding plates containing die plates. This problem is particularly serious when the cross-section of the molding plate, for example with 3,000 to 6,000 individual bores, is considerably larger than the cross-section of the outlet opening for the molding compound at the end of the extruder screw. Unless the molding compound to be processed is uniformly distributed over the entire cross-section of the moulding plate, the compound issues from the individual openings at different rates. Accordingly, the issuing strands are cut into granules of different length by the blade rotating in front of the moulding plate so that a uniform product cannot be obtained.
2. Discussion of Related Art
Although a device of the type mentioned at the beginning is known from DE-OS 25 57 166, only a few (about twenty at most) bore-like passages are provided in the known granulating head so that the above-mentioned problem of uniform distribution of the molding compound does not arise. In the known extruder, the molding compound is uniformly distributed for the simple reason that all the bores are arranged symetrically to one another and equidistantly from the central axis of the extruder.
Accordingly, the problem addressed by the present invention was to provide a granulating device of the type mentioned at the beginning which would enable the molding compound for processing to be uniformly distributed over the entire cross-section of the moulding plate even when the cross-section of the moulding plate was considerably larger than the cross-section of the outlet opening for the molding compound at the end of the extruder screw.
DESCRIPTION OF THE INVENTION
Other than in the operating examples, or where otherwise indicated, all numbers expressing quantities of ingredients or reaction conditions used herein are to be understood as modified in all instances by the term "about".
According to the invention, the solution to this problem is characterized in that, in a device of the type mentioned at the beginning, the preliminary distributor is preceded on the extruder side by a displacement cone and in that the bore-like passages are formed in a support plate and, at the front end of the support plate, each comprise a perforated disk of which the bores have an inlet-end zone of relatively large cross-section and an outlet-end zone of relatively small diameter, the transitional zone between these two zones being inclined at an angle of 55.degree. to 65.degree. relative to the longitudinal axis of the bores.
According to the invention, the ratio of length to diameter in the granules is the same over the entire cross-section section of the molding pl
REFERENCES:
patent: 3949039 (1976-04-01), Yamamoto et al.
patent: 4290989 (1981-09-01), Topor et al.
Carduck Franz-Josef
Pawelczyk Hubert
Grandmaison Real J.
Henkel Kommanditgesellschaft auf Aktien
Jaeschke Wayne C.
Mackey James P.
Szoke Ernest G.
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