PVOH Pouch Film Pattern Registration Control
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Solution Overview
Problem
The challenge in producing pouches with water-soluble polyvinyl alcohol (PVOH) film is maintaining accurate registration of the printed pattern due to the visco-elastic properties of PVOH, which leads to distortion and difficulty in adjusting the position of the pattern during the pouch-making process.
Innovation Solution
An apparatus is designed with a control system that includes registration sensors and adjustment mechanisms to monitor and adjust the position of the printed pattern on the PVOH film, utilizing a rotating drum and multiple printing stations to ensure accurate registration and phasing, even with hygroscopic and temperature-sensitive PVOH films.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If water-soluble PVOH film is used for pouch production, then the pouches gain water-solubility and environmental benefits, but the visco-elastic properties of PVOH cause distortion and make pattern registration difficult
Solution Approach 1:
The patent applies preliminary action by pre-coating the PVOH film with a sizing agent before printing. This sizing layer is applied in advance to stabilize the film's surface properties and reduce its visco-elastic distortion during the printing process, thereby improving pattern registration accuracy without compromising the water-soluble nature of the film
Solution Approach 2:
The patent changes physical parameters by controlling the humidity and temperature conditions during printing and by adjusting the composition and application parameters of the sizing agent. These parameter changes optimize the film's dimensional stability during processing while maintaining its water-soluble characteristics
2Area of stationary object
If multiple printing stations are used to create a complete pattern, then the pattern coverage is improved, but the adjustment and alignment of different pattern parts becomes more difficult
Solution Approach 1:
The patent implements feedback by using registration marks and sensors at each printing station to detect the actual position of the film. The system uses this feedback information to automatically adjust the positioning and alignment of subsequent printing stations, ensuring accurate pattern registration across multiple printing passes despite the film's visco-elastic properties
Solution Approach 2:
The patent applies preliminary action by pre-positioning registration marks on the film before it enters the printing stations. These marks serve as reference points that enable automatic alignment systems to compensate for any film distortion or positioning variations across multiple printing stations
3Manufacturing precision
If the printed pattern is monitored and adjusted during production, then the pattern position accuracy is improved, but the device complexity increases due to additional control systems
Solution Approach 1:
The patent uses feedback through registration marks detected by optical sensors that monitor the film position in real-time. The control system processes this feedback and makes automatic adjustments to printing station positioning, achieving high pattern position accuracy with a relatively simple control architecture that relies on straightforward optical detection and actuation
Data Source
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AI summary
Apparatus for producing pouches comprising a source of printed water-soluble PVOH film, a second source of film, a source of composition, a pouch making unit comprising a filing system to form pouches from the first film, the second film, and the composition, a control system for monitoring and adjusting the position of the pattern onto the pouches.