Compostable Beverage Pod Forming with Optical Moisture Control
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Solution Overview
Problem
Existing manufacturing processes for compostable beverage pods made from cellulose-based materials face challenges in accurately and efficiently controlling moisture levels, leading to issues with structural integrity and shelf-life due to localized and inaccurate moisture measurements, which are exacerbated by the high-speed movement of the sheet material through production lines.
Innovation Solution
A system and method utilizing a humidity sensor system with optical imaging and control units to monitor and adjust moisture levels in real-time, ensuring accurate and uniform moisture distribution across the sheet material, enhancing the structural integrity and shelf-life of the pods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If known sensor systems (microwave radiographic or infrared) are used to measure water content in the sheet material, then measurement capability is provided, but measurement accuracy is insufficient due to radiation noise and localized measurement limitations
Solution Approach 1:
The patent replaces electromagnetic radiation-based sensing (microwave or infrared) with a mechanical contact-based sensing system. The sensor probe physically contacts the sheet material to measure water content, eliminating susceptibility to radiation noise while providing reliable, accurate measurements that directly inform the moistening process control.
2Productivity
If the sheet material travels through the production line at high speed, then productivity is improved, but measurement synchronization becomes difficult causing misalignment between measurement results and respective sheet sections
Solution Approach 1:
The patent implements a feedback control system where the sensor continuously measures water content at the current position of the sheet material, and the control unit immediately uses this information to adjust the moistening process for that specific location. This real-time feedback loop eliminates the synchronization problems that occur with delayed or misaligned measurements in high-speed production.
Solution Approach 2:
The sensor measures the water content of the sheet material before the moistening process is applied to that section. This preliminary measurement allows the control unit to determine the exact moistening requirements for each location before treatment begins, ensuring precise control even at high production speeds.
3Measurement precision
If sensor probes physically contact the sheet material for measurement, then accurate localized water content data is obtained, but the process becomes unsuitable for industrial-scale manufacturing
Solution Approach 1:
The sensor system is designed to automatically measure water content as the sheet material passes through, without requiring manual intervention or sample removal. The continuous, automated measurement process maintains high measurement accuracy while being fully compatible with industrial-scale production speeds and operations.
4Productivity
If there is a delay between taking a measurement and determining the water content, then processing time is reduced, but the measurement becomes irrelevant for the current sheet section
Solution Approach 1:
The patent implements continuous measurement and continuous processing, where the sensor constantly monitors water content and the control unit continuously adjusts the moistening process without interruption or delay. This continuous operation ensures that measurements are always current and relevant to the sheet material being processed, maintaining both high productivity and measurement accuracy.
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 system enables the production of compostable pods with improved structural integrity and extended shelf-life by accurately controlling moisture levels, reducing measurement delays and inaccuracies, and optimizing the manufacturing process.
Implementation Method 1
sensor technology that is based on a microwave radiographic method or absorbance of infrared radiation, the latter taking advantage of the circumstance that water primarily absorbs infrared radiation
Data Source
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AI summary
The invention relates to a system (100) for manufacturing a compostable pod (900) for brewing products. Therein, the pod (900) is made from a sheet (600) made of a biodegradable cellulose-based material. The system (100) comprises at least one shaping line (200), which comprises a handling unit (300) for transferring the sheet (600) along a transfer direction (TD) through the system (100). The shaping line (200) further comprises a humidifying unit (400) for moistening at least one side of the sheet (600) with a moistening agent (401), and a forming unit (800) for shaping a part of the moistened sheet (600) into a three-dimensional shape to form a pod element (910), which defines a pod cavity (911). The shaping line (200) comprises further a humidity sensor system (500) for visually sensing a level of humidity of at least a section of the moistened sheet (600). Values related to the level of humidity sensed by the humidity sensor system (500) are received by a control unit (700), which is further configured to control the humidifying unit (400) based on these values. The invention also relates to a method for manufacturing a compostable pod (900), whereby a level of humidity of at least a section of the moistened sheet (600) is visually sensed and forwarded for controlling the moistening process of the at least one side of the sheet (600) correspondingly.