Bag Sealing Slider Segmentation for Profile Deformation Control
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Solution Overview
Problem
Existing closure systems for bags using complementary profile strips and sliders on automatic machines face issues such as reduced manufacturing speed, complex guide mechanisms, and potential deformation leading to weaknesses or folds in the bag film, especially when closing over the entire pitch of the bag.
Innovation Solution
A method and device that implement two successive sequences of relative movement between the slider and profile strips over distances less than the bag pitch, using blocking devices to ensure continuous scrolling and prevent slider abutment, allowing complete closure without deforming the strips.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the strips of profiles are closed over the entire pitch of the bag using a single blocking sequence, then complete closure is achieved, but the sliders strongly deform the closing profiles causing weaknesses, folds, and positioning difficulties
Solution Approach 1:
The closure process is divided into multiple sequential blocking operations (at least two successive blocking sequences) rather than a single blocking action. Each blocking sequence moves the slider a portion of the total distance, preventing excessive deformation while achieving complete closure over the entire bag pitch. This segmentation of the closing action resolves the contradiction by distributing the deformation stress across multiple smaller steps.
Solution Approach 2:
The blocking device applies periodic blocking actions to the slider, releasing it between sequences to allow continuous movement of the profile strips. This periodic blocking pattern enables the system to achieve complete closure while preventing slider abutment and excessive deformation, maintaining manufacturing precision without requiring overly complex device architecture.
2Manufacturing precision
If the slider is blocked continuously to close profiles over the entire bag pitch, then complete closure is achieved, but two successive sliders come into abutment causing strong deformation and manufacturing issues
Solution Approach 1:
The blocking operation is segmented into multiple sequences with release periods in between. During release periods, the profile strips continue moving while sliders are not blocked, preventing abutment between successive sliders. This maintains manufacturing speed by allowing continuous strip movement while achieving complete closure without excessive deformation.
Solution Approach 2:
The profile strips move continuously throughout the process without interruption, while the blocking action is applied periodically to the sliders. This continuous movement of the useful workpiece (profile strips) maintains high productivity, while the periodic blocking achieves the necessary closure without causing slider abutment or excessive deformation.
3Manufacturing precision
If the strips of profiles are partially separated to avoid slider abutment, then deformation is reduced, but positioning becomes more complex and product stability is compromised
Solution Approach 1:
The closure process uses multiple segmented blocking sequences that progressively close the profiles over the entire bag pitch. Each sequence closes a portion of the profiles without causing excessive deformation, while the cumulative effect achieves complete stable closure. This ensures both low deformation and high reliability of bag mouth positioning.
Solution Approach 2:
The blocking device controls the movement distance and timing parameters of the slider to optimize the closure process. By adjusting these parameters across multiple sequences, the system achieves complete profile closure with minimal deformation while maintaining stable bag mouth positioning for downstream processes.
Data Source
Figure 1
AI summary
The method involves ensuring two successive relative displacement sequences of sliders (C1, C2) and section strips (B1, B2) over distances (L1, L2) strictly lower than a pitch (L) of a sachet. Sum of the distances corresponding to the successive relative displacement sequences is equal to or higher than the pitch of the sachet. The sliders are maintained in an immobile manner, and the section strips are unwound at a predetermined displacement speed. An independent claim is also included for a sachet closing unit closing device comprising a slider blocking device.