Unit Dose Packaging Web Deflection for Vapor Barrier Integrity
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Solution Overview
Problem
Current vertical forming, filling, and sealing (VFFS) processes for unit dose packages, especially those with vapor barriers, are limited by the need for precise and rapid filling, as existing systems struggle with accurately dispensing small amounts of liquid within short cycle times and maintaining vapor barrier integrity during the forming process.
Innovation Solution
A method and apparatus for forming, filling, and sealing unit dose packages involve temporarily deflecting a web of material into a cavity, depositing the product, and sealing it with another web, using a moving belt conveyor and vacuum mechanisms to maintain vapor barrier integrity and achieve faster filling cycles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If vertical forming, filling, and sealing (VFFS) processes are used to maintain vapor barrier properties, then product freshness is preserved, but filling speed and accuracy are limited
Solution Approach 1:
The patent inverts the conventional VFFS sequence by performing filling before forming. The web is fed horizontally, filled with product while flat, then formed into the sachet shape after filling. This reversal eliminates the need to fill through or between formed pouches, dramatically increasing filling speed while preserving vapor barrier integrity since the barrier material is never subjected to high-speed nozzle insertion or deformation during filling.
Solution Approach 2:
The patent applies preliminary action by depositing the product onto the flat web surface before the forming operation. The web is positioned, product is dispensed accurately onto the predetermined location, and only then is the web formed and sealed. This preliminary filling step allows for precise dosage control and high-speed operation without compromising the vapor barrier properties of the packaging material.
2Productivity
If filling occurs while film is in motion in intermittent processes, then continuous production is achieved, but filling accuracy decreases
Solution Approach 1:
The patent replaces the mechanical intermittent stop-and-go system with a continuous horizontal web feed system. Instead of stopping the film for each fill operation, the web moves continuously horizontally while product is dispensed onto it. The positioning accuracy is achieved through precise web control and synchronized dispensing timing rather than mechanical stopping, maintaining both continuous production and high filling accuracy.
3Productivity
If rapid dispensing is implemented to increase filling speed, then productivity improves, but dispensing accuracy deteriorates
Solution Approach 1:
The patent introduces the flat web surface as an intermediary platform for product deposition. Instead of directly filling formed pouches at high speed, the system dispenses product onto the stable, flat web surface which then carries the product to the forming and sealing stations. This intermediary step provides a stable target for accurate dispensing while allowing the overall process to operate at high speed, decoupling dispensing accuracy requirements from forming speed requirements.
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
This approach enables faster and more accurate filling of unit dose packages while preserving the vapor barrier properties of the packaging material, enhancing production efficiency and maintaining product freshness.
Implementation Method 1
using a moving belt conveyor and vacuum mechanisms to maintain vapor barrier integrity
Data Source
AI summary
A method and apparatus for formation, filling, and sealing unit dose packages for consumer products are described herein. A filling system with a filling control system is also disclosed. Although the filling system is described in conjunction with a method for forming, filling, and sealing unit dose packages, the filling system and filling control system can be used in other dispensing processes.