Cold Pellet Size Reduction for Starch Sorbent Absorption Control

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing methods for producing extruded granular absorbents, such as animal litter, suffer from adverse changes in starch properties due to moisture, heat, and mechanical processing, leading to reduced absorption capacity and clumping issues.

Innovation Solution

A system and method involving cold-processing of extruded granular sorbent pellets using air cooling and drying, followed by non-compression particle size reduction, to preserve the starch structure and matrix, minimizing physical and thermal modifications.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If hot air drying is used to reduce moisture content, then drying efficiency is improved, but starch retrogradation occurs reducing absorption capacity

Engineering Contradiction:

Improvedrying efficiencyVSAvoidabsorption capacity

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent changes the drying parameter from high temperature hot air drying to low temperature vacuum drying. By reducing temperature and increasing vacuum level, the drying process achieves moisture removal without causing starch retrogradation, thus preserving absorption capacity while maintaining drying efficiency.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent utilizes phase transition of water from liquid to vapor under vacuum conditions. By creating a vacuum environment, water evaporates at lower temperatures, enabling efficient drying without thermal damage to the starch structure and maintaining absorption properties.

Inventive Principle:

Principle #36Phase transitions

2Manufacturing precision

If hammer milling is performed to reduce particle size, then particle size control is improved, but starch is physically and thermally modified reducing absorption

Engineering Contradiction:

Improveparticle size controlVSAvoidabsorption capacity

Core Design Contradiction:

Manufacturing precisionVSReliability

Solution Approach 1:

The patent replaces the mechanical hammer milling system with a jet grinding system that uses high-velocity air streams. This substitution eliminates mechanical impact and thermal generation, achieving particle size reduction through fluid dynamics alone, thus preserving starch structure and absorption capacity while controlling particle size.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent employs pneumatic jet grinding where high-velocity air streams collide particles to reduce size. This pneumatic mechanism replaces mechanical contact, avoiding both physical crushing and thermal modification of starch, thereby maintaining absorption properties while achieving desired particle size distribution.

Inventive Principle:

Principle #29Pneumatics and hydraulics

3Loss of time

If rapid cooling is applied after extrusion, then processing time is reduced, but starch structure changes adversely affecting performance

Engineering Contradiction:

Improveprocessing timeVSAvoidstarch structure

Core Design Contradiction:

Loss of timeVSStability of the object's composition

Solution Approach 1:

The patent changes cooling parameters from rapid ambient air cooling to controlled vacuum cooling. By maintaining vacuum conditions during cooling, the process removes heat efficiently through evaporation while preventing adverse starch structure changes, achieving both time efficiency and structural stability.

Inventive Principle:

Principle #35Parameter changes

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The method maintains the starch properties of the pellets, enhancing absorption capacity and clumping ability, resulting in improved performance as litter.

Implementation Method 1

a cooling and drying subsystem that cools and dries pellets upon extrusion

Methodology Applied

Scientific EffectEvaporation: Evaporation

Implementation Method 2

grain milling byproducts containing enough starch to form at least 30% gelatinized starch in each extruded pellet during extrusion

Methodology Applied

Scientific EffectGelatinization:

Data Source

PatentUS12478034B2System and ultrahigh pressure extrusion method for making extruded granular sorbent with post-extrusion cold-processing of extruded granular absorbent for size control

Publication Date: 2025.11.25 PIONEER PET PRODUCTS LLC

AI summary

A method, system and machine for cold processing extruded starch-containing pellets by cold particle size reducing pellets of a size greater than a particle size reduction setting size enabling particle size reduction to be performed without compacting or compression any size reduced particle while doing so without heating them during particle size reduction thereby preserving their pores, internal liquid absorbing voids and starch matrix optimizing granular sorbent performance. Such a method, system and machine is selectively controllable enabling not only control of how many and a ratio of fines produced relative to the final product providing real time control of fines production but also is able to provide particle size distribution control as well. A preferred particle size reduction machine is a roll granulator that breaks larger size pellets into smaller sized particles and/or fines without compressing or compacting them with the spacing between the rolls selectively variably in a manner that regulates how much of different sized particles and/or particles falling within certain size ranges are produced advantageously enabling real time control of particle size distribution to be achieved during extruder line operation.