Pre-expanded Starch Extrusion for Durable Edible Pet Chews
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Solution Overview
Problem
Conventional pet food products fail to provide extended chewing duration, are often non-edible, high in calories, expensive, and can pose safety risks due to high protein levels or poor texture design, leading to digestive issues and dental problems in pets.
Innovation Solution
A bio-plastics material produced from expanded starch, thermally treated with shear and a hydrogen bond-forming component under low moisture conditions, creating a biodegradable, edible product with a broad range of textures that is resistant to bite force and low in calories, suitable for pets and potentially for load-bearing applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If conventional extrusion methods are used to produce chewy pet products, then extended chewing duration is achieved, but the products are often non-edible and cause digestive problems
Solution Approach 1:
The patent changes the fundamental parameters of the extrusion process by using pre-expanded starch particles instead of conventional flour or meal, and by controlling moisture content to be below the glass transition point of starch. This creates a unique parameter space where the product achieves both extended chewing duration and digestibility. The pre-expanded particles create a porous structure that extends chewing time while the controlled moisture ensures the starch remains gelatinizable and digestible.
Solution Approach 2:
The patent creates a composite material system combining pre-expanded starch particles with specific binders and conditional liquid components. This composite structure allows the product to have the mechanical strength and chewiness needed for extended chewing while maintaining digestibility. The composite nature enables differentiation between the chewable structure and the digestible components.
2Duration of action of moving object
If pliable materials are used to resist pet chewing force, then extended chewing duration is achieved, but production cost increases
Solution Approach 1:
The patent employs inexpensive starch-based materials that can be disposed of after serving their chewing function. The pre-expanded starch particles provide sufficient structural integrity for chewing duration without requiring expensive pliable materials. The product is designed to be economically disposable, aligning with the principle of using cheap materials for single-use or limited-use applications.
Solution Approach 2:
By changing the physical state and structure of starch through pre-expansion and controlled moisture content, the patent achieves chew resistance without using expensive materials. The parameter changes in starch structure (from granular to pre-expanded porous structure) provide the necessary mechanical properties at low cost.
3Duration of action of moving object
If high protein constituents are used to create chewy products, then extended chewing duration is achieved, but safety risks increase due to potential renal failure and urinary tract blockage
Solution Approach 1:
The patent extracts or removes protein from the primary constituent list, replacing high-protein materials with starch-based materials. The formulation specifically excludes or minimizes protein content while maintaining chewiness through the pre-expanded starch structure and conditional liquid components. This extraction of the harmful element (high protein) while preserving the desired function (chewing duration) directly addresses the safety concern.
Solution Approach 2:
The patent changes the compositional parameters by substituting protein-based chewable materials with starch-based materials. This parameter change in the chemical composition (from high protein to starch-dominated formulation) eliminates the renal and urinary tract risks associated with high protein intake while maintaining the chewing duration benefit.
4Productivity
If starch-based materials are used for injection molding, then production is achieved, but the equipment is expensive and complex to operate
Solution Approach 1:
The patent replaces the complex mechanical injection molding system with a simpler extrusion-based process. Instead of requiring expensive injection molding equipment with high-pressure systems, the invention uses conventional extrusion technology that is already widely available in the pet food industry. This substitution of the manufacturing mechanism dramatically reduces equipment complexity and cost.
Solution Approach 2:
The patent changes the processing parameters from those required for injection molding (high pressure, precise temperature control, complex mold systems) to extrusion parameters (lower pressure, simpler heating, continuous processing). This parameter change enables production using less complex, more cost-effective equipment while maintaining product quality.
5Stability of the object's composition
If conventional cooking methods are used, then constituents are cooked, but water restricts the range of textures that can result
Solution Approach 1:
The patent changes the moisture parameter from conventional high-moisture cooking to low-moisture processing below the glass transition point of starch. This parameter change enables a broader range of textures by preventing excessive gelatinization and allowing for crisper, chewier, and more varied textural outcomes. The controlled moisture level acts as a new processing parameter that expands texture possibilities.
Solution Approach 2:
The patent utilizes the glass transition phase transition of starch as a critical control point. By processing below the glass transition temperature and controlling moisture content, the patent achieves different textural states that would not be possible with conventional cooking. The phase transition behavior of starch becomes a tool for texture differentiation rather than a limitation.
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 solution provides a safe, edible, and long-lasting chewable pet food product that improves dental hygiene, reduces environmental emissions, and offers a cost-effective method for producing pet foods with varied textures, while being environmentally friendly and low in caloric content.
Implementation Method 1
the constituent is cooked to gelatinize the starch and thereby provide a coherent and firm product mass having a structural integrity
Implementation Method 2
shear is imparted to the expanded material, causing it to melt, substantially completely
Implementation Method 3
cooking is carried out in the presence of a component other than water that has the capacity to form hydrogen bonds
Data Source
AI summary
The present invention provides methods and products made thereby, wherein a pre-expanded constituent, including an edible constituent, is thermally treated to melt it, preferably in a dynamic process environment, to produce products ranging from high to quite low densities and from very strong to soft to apparently dry textures. The wide range of textures enables the provision of food products such as low calorie, digestible and safe, long duration pet food chews. Non-food products suitable for use in manufacture may also be produced. Cooking is preferably carried in an extruder, preferably at low moisture or in the total absence of added water. The methods of dynamic cooking reduce cost in a number of ways including but not limited to decreased process steps, increased throughput, decreased capital expenses and decreased raw product cost.