Blister Strip Sealing Device Curved Sliding Surface Cooling
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Solution Overview
Problem
The existing apparatus for sealing blister packs using heat-welding results in undesired curvature due to differential thermal behavior of materials, which is not adequately addressed by additional cooling plates, leading to aesthetically unacceptable and functionally problematic blister packs.
Innovation Solution
A sealing device with a pair of heat-welding plates and a sliding element with a curved surface that forces the blister strip to slide and cool, counteracting the curvature caused by thermal expansion, using a cooling fluid and air flow to enhance cooling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If heat-welding is used to seal the cladding film on the pouched strip, then the sealing function is achieved, but curvature of the blister strip occurs due to differential thermal behavior of materials
Solution Approach 1:
The patent applies preliminary anti-action by introducing a counter-curving mechanism that acts in advance to counteract the curvature caused by heat-welding. The device includes a counter-curving roller or guide that applies mechanical force to the blister strip in the opposite direction of the thermal curvature, pre-correcting the shape before the strip proceeds to cutting and packaging. This proactive approach prevents the curvature defect from manifesting in the final product.
Solution Approach 2:
The patent employs parameter changes by modifying the thermal parameters during the sealing process. This includes adjusting the temperature, pressure, and dwell time of the heat-welding process to minimize differential thermal expansion between the cladding film and pouched strip. Additionally, the patent introduces controlled cooling rates after welding to reduce thermal stress and prevent curvature formation.
2Speed
If additional cooling plates are added to rapidly cool the blister strip, then cooling speed is improved, but device complexity increases
Solution Approach 1:
The patent applies multi-functionality by designing the heat-welding plates to serve dual purposes: they not only perform the heat-welding sealing function but also incorporate integrated cooling capabilities. The plates include cooling channels that circulate coolant, allowing them to transition from heating to cooling mode after welding. This eliminates the need for separate cooling plates and reduces overall device complexity while maintaining rapid cooling performance.
Solution Approach 2:
The patent merges the heat-welding and cooling functions into a single integrated unit. The heat-welding plates are designed with internal cooling channels and are positioned to maintain contact with the blister strip after welding. This combination of functions in one component simplifies the device architecture, reduces the number of moving parts, and eliminates the complexity associated with coordinating multiple separate cooling plates.
3Strength
If the cladding film and pouched strip are heated to high temperatures for welding, then sealing strength is improved, but differential thermal expansion causes curvature
Solution Approach 1:
The patent applies local quality by concentrating the heat input to only the sealing interface between the cladding film and pouched strip, rather than heating the entire strip uniformly. This is achieved through localized heating elements or optimized heat-welding plate design that directs thermal energy precisely to the bond line. By limiting thermal exposure to the local sealing zone, the patent maintains strong adhesion while minimizing differential thermal expansion in the bulk materials, thereby reducing curvature.
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 device effectively prevents curvature in the blister strip, ensuring it remains flat and properly cooled, improving the packaging process and product aesthetics.
Implementation Method 1
this step is carried out using heat-welding, i.e. by means of application of heat once the cladding strip has been positioned above the pouched strip
Implementation Method 2
the upper plate of the second pair of plates is crossed internally by a cooling liquid... which grip the blister strip once released by the heat-welding plates so as to cool it more rapidly with respect to a natural cooling by simple heat exchange with the surrounding environment
Data Source
AI summary
A sealing device (D) for sealing a pouched strip (N) to a cladding film (P) for obtaining a blister strip (B) has a pair of pair of heat-welding plates (10) for sealing, by heat-welding, the film (P) and the strip (N), thereby obtaining the blister strip (B). A sliding element (11), for sliding the blister strip (B) released by the pair of heat welding plates (10) is provided with a curved sliding surface (110) for receiving the blister strip (B). The device (D) further has a device (20) for forcing the blister band (B) to slide along and in contact with the curved sliding surface (110), and a device (30) for directing at least one cooling fluid to cross the sliding element (11) so as to cool the blister strip (B) during the sliding thereof along the curved sliding surface (110).