Detergent Portion Units With Localized Heating for Uniform Film Thickness
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Solution Overview
Problem
Existing methods for producing pre-portioned detergent and cleaning agent pouches with multiple chambers face challenges in achieving homogeneous film thickness distribution, leading to mechanical instability, ease of deformation, and aesthetic issues, while requiring complex equipment and high setup costs.
Innovation Solution
A method involving a heating device with depressions that replicate the cavity outline at a reduction factor of 0.6 to 0.8, using a metallic surface with controlled heat transfer and vacuum contact to uniformly stretch water-soluble films, forming receiving chambers with minimal equipment and material use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional heating devices with flat surfaces are used, then the production process is simple, but the film thickness distribution becomes heterogeneous
Solution Approach 1:
The heating device features localized depressions in specific regions (edge areas) rather than uniform heating across the entire surface. This local quality modification allows targeted thermal treatment where film stretching is most pronounced, achieving homogeneous film thickness distribution by addressing specific problem areas with enhanced heating while maintaining simplicity elsewhere in the device design.
2Shape
If deep-drawing processes with high deformation are used to create multiple chambers, then the receiving container geometry is achieved, but the film thickness distribution becomes more heterogeneous
Solution Approach 1:
The heating step is performed before the deep-drawing deformation process, preparing the film in advance by creating a temperature profile that anticipates the upcoming deformation. This preliminary thermal treatment ensures the film has appropriate plasticity and responds uniformly to the subsequent forming process, preventing heterogeneous thickness distribution even when creating complex multi-chamber geometries.
3Volume of moving object
If the film is stretched to form deep cavities, then the receiving chamber depth is increased, but the minimum film thickness decreases
Solution Approach 1:
The heating device applies localized heating to edge and high-stretch areas before forming, ensuring these regions achieve uniform thickness distribution. This local quality enhancement prevents excessive thinning in critical areas while still allowing sufficient deformation to create deep receiving chambers with adequate volume, maintaining minimum film thickness requirements throughout the structure.
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 produces detergent portion units with high mechanical stability, appealing appearance, and minimal packaging, achieving homogeneous film thickness and efficient production.
Implementation Method 1
heating the film increases its plasticity
Implementation Method 2
the force resulting from the negative pressure applied to the heated film causes it to stretch and plastically deform
Implementation Method 3
through the action of heat and negative pressure
Implementation Method 4
causes it to stretch and plastically deform
Data Source
AI summary
A method for producing a portion unit with at least one filled receiving chamber surrounded by a film, comprising the steps: a) transporting a first film towards a heating device; b) bringing the first film into contact with a surface of the heating device; c) heating the first film by means of the heating device; d) removing the contact between the first film and the heating device; e) forming the first heated film into the cavities of a thermoforming die, forming a receiving container with at least one receiving chamber; f) filling the at least one receiving chamber;g) optionally closing and separating the filled receiving containers to form the portion unit, wherein the surface area of the heating device which is brought into contact with the film has at least one depression and the at least one depression in step b) is covered by the partial areas of the first film which are formed into the cavity of the thermoforming die in step e).