Process and apparatus for coating a controlled release product in a rotating drum

A technology of rotating rollers and rotating directions, which is applied in the direction of surface coating liquid devices, spraying devices, fertilizing devices, etc., and can solve problems such as high raw material consumption, net profit impact, and adverse effects on controlled release product quality.

Active Publication Date: 2007-11-07
爱禾瑞公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Not only is this cleaning process costly, but production interruptions and higher raw material consumption also have a negative impact on net profit
Also, fouling adversely affects the quality of controlled release products
[0004] In prior art methods, since the coating material has only limited opportunities to be Mixing, so coating quality (and thus product performance) is reduced

Method used

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  • Process and apparatus for coating a controlled release product in a rotating drum
  • Process and apparatus for coating a controlled release product in a rotating drum
  • Process and apparatus for coating a controlled release product in a rotating drum

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] A rotating cladding unit with three cladding zones with a total of three sets of nozzles and tubes, one set for each cladding zone, was used.

[0077] In the wet belt of the first cladding zone, the premix (comprising castor oil) and isocyanate are delivered simultaneously through pipes (ie drip or spray) from behind a curved angle iron plow tool welded into the cladding unit. Plow tools were also used in the second and third cladding areas.

[0078] The plow tool was found to contribute to a reduction in the product release rate. It was also found that by introducing the premix and isocyanate from behind the plow, the dry zone of the first cladding zone was increased from about 1 to 11 / 2 feet to about 5 feet. This increase in the drying zone is comparable to the improvement in the drying zone in the second and third sheathing zones, which would not have been possible before the addition of the plow and the feeding of the sheathing material from behind the plow. This ...

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Abstract

The present invention is directed to a process for coating a substrate in a rotating drum, wherein a pocket is created in a substrate bed into which pocket coating materials are delivered. Also provided is a controlled release product produced according to this process, and an apparatus for carrying out the process.

Description

technical field [0001] The present invention relates to an improved method and apparatus for coating a substrate in a rotating drum. Background technique [0002] Typical fertilizer granules are coated by spraying and / or dripping the coating composition onto the top surface of a bed of fertilizer granules in a rotating drum. In this method, coating materials, such as castor oil and isocyanate, have difficulty penetrating into the interior of the particle bed. One reason for this is that their high viscosity and surface tension inhibit their penetration into the particle bed. Because these coating materials do not readily penetrate the granule bed, they coat the surface of the roller and then transfer to the surface of the fertilizer granules. During this two-stage process, the coating material was not effectively spread on the surface of the fertilizer granules within the time required for the reaction of castor oil and isocyanate to form polyurethane (approximately 4 minu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D1/00B05C19/04B05C5/00B05B17/00B01J2/12B05D1/12B05D1/02C05G5/00
CPCB01J2/006B05B13/0257B01J2/12C05C9/005C05G5/37
Inventor 邢宝忠劳伦斯·亚瑟·维尔姆斯尼克·彼得·温尼克罗伯特·格伦·福特妮科莱特·玛丽·巴布拉克戴维·J·伊斯特汉
Owner 爱禾瑞公司
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