Capsule Filter Preform Sealing via Ultrasonic Welding
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Solution Overview
Problem
The challenge lies in forming and sealing ultra-lightweight filters into capsules on a commercial scale, as they are difficult to work with due to their lightweight nature and material properties.
Innovation Solution
A system comprising a filter forming station with a mandrel for shaping the filter preform and a capsule holder for positioning the capsule, along with a filter sealing station for sealing the filter preform within the capsule, ensures accurate placement and sealing of the ultra-lightweight filter material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If ultra-lightweight filter material is used in capsules, then material costs are reduced and recyclability is improved, but the material becomes difficult to form and seal on a commercial scale
Solution Approach 1:
The filter material is pre-formed into a cup shape with flanges extending beyond the capsule opening before insertion. This preliminary shaping allows the lightweight material to maintain its form during handling and insertion, enabling subsequent sealing operations to be performed effectively on commercial manufacturing lines.
2Ease of repair
If ultra-lightweight filter material is used in capsules, then recyclability is improved, but the material becomes difficult to work with during formation and sealing
Solution Approach 1:
The filter is constructed as a thin-walled cup-shaped structure with flanges that extend beyond the capsule opening. This flexible yet maintainable form allows the ultra-lightweight material to be manipulated during assembly while preserving its integrity for recycling. The flange design provides sufficient structural support for sealing operations without compromising the lightweight nature of the material.
3Productivity
If commercial scale production is implemented, then productivity increases, but the difficulty of working with ultra-lightweight materials becomes more significant
Solution Approach 1:
The filter material is pre-formed into a cup shape with flanges before insertion into the capsule. This preliminary action allows the lightweight material to maintain its form during automated handling and insertion processes, enabling subsequent sealing operations to be performed effectively on commercial manufacturing lines without requiring complex real-time manipulation equipment.
Solution Approach 2:
The sealing process utilizes ultrasonic welding technology to join the filter flange to the capsule rim. This mechanical substitution replaces traditional thermal or adhesive sealing methods with ultrasonic vibration-based welding, which is particularly effective for bonding ultra-lightweight materials at commercial production speeds without requiring complex mechanical manipulation of the delicate filter material.
Data Source
AI summary
A system and process for forming and sealing a filter in a capsule is provided. The system includes a filter forming station having a mandrel for forming a filter preform, a capsule holder for holding a body of a capsule for receiving the mandrel with the filter preform and a filter sealing station including a sealer for sealing the filter preform to the body at a desired location within the interior surface of the body. The mandrel is adapted to hold the filter preform at a desired position for placement and sealing within the body. The process includes forming a filter preform on a mandrel from a filter material, positioning a body of a capsule for receiving the mandrel with the filter preform, the mandrel being adapted to hold the filter preform, and sealing the filter preform at a desired location to an interior surface of the body.