Folding And Heat-Sealing Assembly for Wrinkle-Free Multi-Material Packaging
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Solution Overview
Problem
Existing packaging assemblies are not versatile enough to handle both aluminum and polymeric or biopolymeric materials, leading to imperfect heat-sealing and wrinkles, especially at high operating speeds, and require dedicated setups for each material type.
Innovation Solution
A folding and heat-sealing assembly with a sliding folding plate, wedge-shaped folding bars, and complementary heat-sealing blocks that adapt to any material type, ensuring precise folding and heat-sealing at high speeds, using controlled motors and parametrized cams for optimal operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If folding units move away from folded flaps made of polymeric or biopolymeric material, then the material elastically returns to an intermediate arrangement, but this complicates or impedes the closure action of heat-sealing units and causes wrinkles and creases
Solution Approach 1:
The patent applies preliminary anti-action by introducing a holding device that prevents the elastic return of polymeric/biopolymeric flaps before heat-sealing occurs. The device maintains the folded configuration against the natural elastic recovery tendency, ensuring the flaps remain in the correct position for precise heat-sealing. This counteracts the harmful elastic return effect before it can cause misalignment or wrinkles.
Solution Approach 2:
The holding device acts as an intermediary between the folding unit and the heat-sealing unit. It temporarily maintains the folded flaps in the correct position, bridging the gap between the folding operation and the heat-sealing operation. This intermediary mechanism ensures that the flaps remain properly positioned even after the folding unit moves away, enabling precise heat-sealing without direct continuous contact.
2Productivity
If dedicated assemblies are used for specific wrapping sheet types, then higher operating speeds are achieved, but versatility to handle different materials is lost
Solution Approach 1:
The patent implements universality by designing a holding device with adjustable parameters (temperature, pressure, time) that can accommodate different sheet materials including aluminum, polymeric, and biopolymeric sheets. The device structure allows modification of its operating parameters to suit various materials while maintaining the same basic mechanism, enabling a single assembly to handle multiple material types at high speeds without requiring dedicated setups for each material.
Solution Approach 2:
The patent applies dynamics by making the holding device's operating parameters adjustable and adaptable. The temperature, pressure, and holding time can be dynamically modified based on the specific material being processed. This dynamic adaptability allows the same physical device to optimize its performance for different materials, achieving both high speed operation and material versatility.
3Reliability
If heat-sealing units are designed for specific material characteristics, then optimal heat-sealing is achieved for that material, but the assembly cannot be used with different material types without modifications
Solution Approach 1:
The patent applies parameter changes by enabling the holding device to modify its operating parameters (temperature, pressure, time) according to the specific material being processed. Instead of redesigning the entire assembly for each material type, the system maintains a consistent physical structure while dynamically adjusting the process parameters to achieve optimal heat-sealing quality for aluminum, polymeric, or biopolymeric sheets.
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
The assembly achieves defect-free, stable closures at high speeds (up to 250 products per minute) on various materials, minimizing wrinkles and creases, and can be easily integrated into conventional packaging plants.
Implementation Method 1
at least one heat-sealing block, of shape and dimensions that are complementary to those of said lateral end of said tubular portion and movable between a passive configuration, in which it is spaced apart from said lateral end, and an active configuration, in which it abuts against said lateral end
Implementation Method 2
heat-sealing units that seal the flaps in that arrangement
Data Source
AI summary
An assembly for folding and heat-sealing at least one tubular portion constituted by flaps of packaging sheets which protrude with respect to opposite fronts of a product arranged on a conveyance line, comprises: a folding station provided with at least one folding plate having a width that is smaller than that of the product and of the tubular portion and at least one folding bar; at least one heat-sealing block, of shape and dimensions that are complementary to those of the lateral end of the tubular portion and movable between a passive configuration, in which it is spaced apart from the lateral end, and an active configuration, in which it abuts against the lateral end, following a release of the lateral end by the folding bar; at least one heat-sealing plate, arranged downstream of the folding station along the conveyance line.