Packaging Assembly Optimizing Sealing Distance to Control Batch Elongation
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Solution Overview
Problem
Existing snack food packaging machines are limited in speed due to undesirable product batch elongation, which occurs as batches fall through the packaging system, leading to increased length and potential misalignment issues.
Innovation Solution
A packaging assembly that includes a former to form tubular bag material, a drive assembly to engage and move the bag material, and a packaging machine with sealing jaws that close the bag at a predetermined position, optimizing the distance between the former's lower extremity and the sealing point to minimize batch elongation, typically between 100 mm to 400 mm, and preferably around 250 mm to 280 mm, using either rollers or belts to manage the bag material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the packaging machine speed is increased to increase productivity, then the number of packets produced per minute increases, but product batch elongation becomes more severe causing misalignment and defects
Solution Approach 1:
The patent applies preliminary action by positioning the sealing point at a predetermined distance (100-400mm) below the former's lower extremity before the product batch fully forms. This anticipatory sealing location prevents excessive batch elongation from occurring in the first place, allowing higher operating speeds without misalignment defects.
Solution Approach 2:
The patent changes the critical parameter of sealing position distance from the former extremity to 100-400mm (optimally 250-280mm). This parameter modification directly controls batch elongation characteristics, enabling the system to operate at higher speeds while maintaining precise product alignment within the bag.
2Shape
If the fall length from former to packaging machine is increased to improve bag formation, then the tubular bag material is better formed, but product batch elongation increases causing misalignment
Solution Approach 1:
The patent optimizes the fall length parameter to a specific range (100-400mm below the former extremity) where bag formation quality is maintained while batch elongation is controlled. This precise parameter setting prevents the harmful effect of excessive batch lengthening that would occur with longer fall distances.
Solution Approach 2:
The patent ensures continuous proper bag formation through the optimized fall distance while simultaneously maintaining continuous control over batch elongation. The sealing jaws engage at the predetermined position to continuously seal bags without interruption, preventing both formation defects and batch misalignment.
3Manufacturing precision
If the sealing point is positioned closer to the former to reduce batch elongation, then product alignment is improved, but bag material formation may be compromised
Solution Approach 1:
The patent establishes the optimal sealing position parameter range of 100-400mm below the former extremity through systematic investigation. This parameter value balances two competing requirements: it is far enough to allow proper bag material formation but close enough to minimize product batch elongation and ensure precise alignment.
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 configuration minimizes batch elongation, allowing for increased packaging speed, up to 250 to 300 bags per minute, while reducing rejects by ensuring proper bag formation and reducing the chance of product misalignment during sealing.
Implementation Method 1
a drive assembly located below the former to engage the tubular bag material to pull the tubular bag material past the former
Implementation Method 2
This function is performed by heating the tubular bag material along its longitudinally overlapping edges and by applying pressure to the overlapping longitudinal edges
Data Source
AI summary
A packaging assembly (10) including a weighing machine (11) that is located above a former (22). Located below the former (22) is a packaging machine (29), with strip bag material (25) being pulled through the assembly by a film drive assembly (46) that pulls the bag material past the former (22) to form tubular bag material (26) that is delivered to the packaging machine (29) together with product to form bags of the product.