Forming Guide for Vertical Form Fill Seal Webs
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Solution Overview
Problem
Existing vertical forming, filling, and sealing (VFFS) processes for unit dose packages, such as sachets, face issues with uneven material distribution and wrinkling due to the reliance on webs forming spaces around nozzles, leading to inconsistent sachet widths and potential leaks.
Innovation Solution
A multi-lane VFFS apparatus with a forming guide that shapes the webs to maintain equal path length across their width, using projections and valleys oriented in the machine direction, and optionally rollers, to ensure consistent strain and reduce bagginess, combined with a sealing mechanism that accounts for non-planar web configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If webs are forced together between nozzles to create dispensing space, then product dispensing is enabled, but material distribution becomes uneven and wrinkling occurs
Solution Approach 1:
The forming guide is positioned upstream of the nozzles to pre-shape the webs into a pleated configuration before they reach the dispensing zone. This preliminary action creates consistent material distribution and eliminates wrinkles before product dispensing occurs, resolving the contradiction between enabling dispensing and maintaining material uniformity
Solution Approach 2:
The forming guide acts as an intermediary device between the web feed and the nozzles. It mediates the transition from flat webs to pleated configuration, ensuring smooth material flow and consistent spacing without direct contact between webs and nozzles, thereby preventing wrinkling while maintaining dispensing capability
2Ease of manufacture
If webs are forced together between nozzles, then sachet formation is enabled, but transverse seals become inconsistent leading to leaks
Solution Approach 1:
The forming guide pre-shapes the webs into a consistent pleated configuration before sealing occurs. This preliminary shaping ensures that when transverse seals are formed, the material is evenly distributed and free of wrinkles, enabling reliable sealing and preventing leaks while maintaining ease of manufacture
3Productivity
If nozzles are inserted between webs to form packages, then multi-lane production is enabled, but web spacing becomes inconsistent
Solution Approach 1:
The forming guide is positioned upstream to pre-establish consistent web spacing and pleated configuration before the webs reach the multi-lane nozzle array. This preliminary action ensures uniform material distribution across all lanes, enabling high-productivity multi-lane production while maintaining precise web spacing
Solution Approach 2:
The forming guide creates multiple pleats across the web width, effectively segmenting the material into consistent sections for each lane. This segmentation ensures that each nozzle receives uniformly spaced and distributed material, maintaining manufacturing precision across multiple lanes
Data Source
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AI summary
A method and apparatus for pleating or otherwise shaping a web are described herein. The method and apparatus may have numerous applications. In some embodiments, the method and apparatus are used in the formation, filling, and sealing of unit dose packages for consumer products. A method and apparatus for forming sealing two moving webs together, which webs have portions that are non-planar are also described herein.