Powder Pellet Coating With High-Viscosity Polysaccharide Layers
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Solution Overview
Problem
Existing methods for coating powder pellets, such as those used in beverage capsules, require multiple repetitions due to the use of low-viscosity polysaccharide solutions, leading to inefficiencies in time, energy, and cost.
Innovation Solution
A method utilizing highly viscous polysaccharide solutions with viscosities between 400 and 4000 mPas, applied via alternative techniques like overmolding or spraying, followed by a single-step coating process that includes crosslinking and drying.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If low-viscosity polysaccharide solutions are used for coating, then the coating solution can be easily pumped, poured, and recirculated, but multiple coating repetitions are required resulting in high time and energy expenditure
Solution Approach 1:
The patent changes the viscosity parameter of the polysaccharide coating solution from low-viscosity to high-viscosity range. This parameter change allows achieving sufficient coating thickness in a single application step, eliminating the need for multiple repetitions and thereby improving productivity while maintaining ease of operation through optimized application methods
Solution Approach 2:
The patent transitions from a multi-step iterative coating process to a single-step coating process by utilizing high-viscosity solutions. This dimensional change in the process flow (from repeated cycles to one-time application) resolves the contradiction between operational ease and productivity
2Device complexity
If low-viscosity polysaccharide solutions are used for coating, then the coating process can be simplified in terms of application method, but the coating thickness is very thin requiring multiple repetitions
Solution Approach 1:
By changing the viscosity parameter to high-viscosity range, the patent achieves sufficient coating thickness in a single application. This parameter change directly addresses the coating thickness control issue without increasing process complexity, as the high-viscosity solution maintains stability and applicability
3Manufacturing precision
If multiple coating repetitions are performed to achieve sufficient coating thickness, then the desired coating quality is achieved, but time and energy consumption increase significantly
Solution Approach 1:
The patent changes the viscosity parameter to high-viscosity range, enabling sufficient coating thickness to be achieved in a single application step. This eliminates multiple repetitions, thereby reducing production time and energy consumption while maintaining coating quality
Solution Approach 2:
By using high-viscosity polysaccharide solutions, the patent skips the multiple repetitive coating steps required by low-viscosity solutions. The high-viscosity solution deposits sufficient material in one go, rushing through the coating process efficiently without compromising quality
4Manufacturing precision
If multiple coating repetitions are performed to achieve sufficient coating thickness, then the desired coating quality is achieved, but energy expenditure increases significantly
Solution Approach 1:
By changing the viscosity parameter to high-viscosity range, the patent achieves sufficient coating thickness in a single application. This eliminates multiple repetitions and associated drying cycles, thereby significantly reducing energy consumption while maintaining coating quality
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
Enables rapid, efficient, and cost-effective coating of powder pellets with a single layer, reducing energy consumption and production time while maintaining high tensile strength and barrier properties.
Implementation Method 1
Applying the coating solution to the powder pellet
Implementation Method 2
Drying the coated powder pellet
Data Source
AI summary
The invention relates to a method for coating a powder pellet, in particular for producing a capsule containing beverage powder. The method comprises the following steps: a) providing a powder pellet made from a powder containing at least one polysaccharide, b) providing a coating solution made from at least one polysaccharide for coating the powder pellet, c) applying the highly viscous coating solution to the powder pellet, d) drying the coated powder pellet. The coating solution has a viscosity between at least 400 mPas and at most 4000 mPas, preferably between 600 and 2500 mPas, and particularly preferably between 800 and 1500 mPas, as measured by a rheometer. The invention also relates to a capsule for beverage preparation.