Two-Composition Toilet Blocks Using Non-Concentric Coextrusion
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Solution Overview
Problem
Existing toilet blocks with multiple compositions release active ingredients unevenly, with the outer shell dissolving first and the core releasing later, failing to achieve a consistent release profile over their entire service life.
Innovation Solution
A toilet block production method involving non-concentric coextrusion, where two compositions are in spatial contact with different regions of the extruder head's side wall, followed by spheronization to form a spherical geometry, ensuring even distribution and simultaneous release of active ingredients.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If concentric coextrusion is used to produce toilet blocks with two compositions, then different active ingredients can be combined in the block, but the shell dissolves first resulting in uneven release of active ingredients
Solution Approach 1:
The patent applies asymmetry by using non-concentric coextrusion where the first and second compositions are extruded in asymmetric positions relative to the extruder head axis. The first composition contacts a first partial area of the side wall while the second composition contacts a second partial area, creating an asymmetric internal structure that enables simultaneous dissolution and uniform release of both active ingredients throughout the block's service life.
2Ease of manufacture
If concentric coextrusion is used, then production is simplified, but the block geometry causes the outer shell to dissolve before the core
Solution Approach 1:
The patent applies segmentation by dividing the extruder head's side wall into multiple partial areas and assigning different compositions to different segments. The first composition is in spatial contact with a first partial area while the second composition is in spatial contact with a second partial area, creating segmented composition distribution that enables simultaneous dissolution rates and consistent performance throughout the block's service life.
3Device complexity
If a single composition is used for the rim block, then the production process is simple, but only one type of active ingredient can be effectively utilized
Solution Approach 1:
The patent applies merging by combining multiple compositions containing different active ingredients into a single integrated rim block structure. The non-concentric coextrusion process merges the first composition with its active ingredient and the second composition with its active ingredient into one homogeneous-looking block, achieving multi-functionality while maintaining production efficiency.
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 ensures a uniform and consistent release of both active ingredients throughout the block's life, enhancing aesthetics and performance by maintaining a symmetrical geometry that allows even flushing and contact with water.
Implementation Method 1
the production of the toilet block comprises a non-concentric coextrusion step
Implementation Method 2
the two compositions are interwoven with one another on the surface in a streak-like manner
Data Source
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AI summary
The invention relates to a solid toilet block comprising at least a first composition and a second composition obtained by a non-concentric co-extrusion step, as well as a method for producing such a toilet block and a device comprising such a toilet block.