Blister Packing Machine Tension Control for Film Sagging
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Solution Overview
Problem
Blister packs undergo shrinkage deformation and sagging during retort sterilization, leading to defects like wrinkles in the container film, which affect the sealing quality and appearance of the blister pack.
Innovation Solution
A blister packing machine with a tension applying mechanism that stretches the container film in the width direction during the formation of pocket portions, using protruding portion forming elements and holding guides to stabilize the film and prevent sagging, even at high preheating temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the preheating temperature of the container film is set to a relatively high temperature to suppress shrinkage deformation, then the shrinkage deformation is reduced, but the container film sags significantly by its own weight causing wrinkles and quality defects
Solution Approach 1:
The invention applies a preliminary anti-action by introducing a tension applying portion that exerts tension on the container film in the width direction before and during the pocket portion forming process. This preliminary tension counteracts the sagging effect caused by high preheating temperatures, preventing wrinkles from forming in the pocket portion or mounting areas while allowing the high temperature necessary to suppress shrinkage deformation during subsequent heat treatment
2Reliability
If the preheating temperature is increased to prevent shrinkage during heat treatment, then the shrinkage deformation is suppressed, but the container film sags and causes wrinkles in the pocket portion
Solution Approach 1:
The tension applying portion implements preliminary anti-action by applying tension to the container film along the width direction before pocket portion formation. This prevents the film from sagging and forming wrinkles while maintaining the high preheating temperature necessary for reliable shrinkage suppression during retort sterilization
Solution Approach 2:
The invention changes the physical state parameters of the container film by applying tension in the width direction during preheating. This parameter change (applying mechanical tension) allows the film to maintain stability and prevent wrinkles even at high temperatures that would otherwise cause significant sagging
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 effectively prevents defects such as wrinkles and ensures reliable sealing and appearance quality by maintaining the container film's stability during heat treatment, while also simplifying the apparatus and reducing manufacturing costs.
Implementation Method 1
The preheating unit preheats the container film to soften the container film
Implementation Method 2
a tension applying portion configured to apply a tension along a width direction of the container film to at least a pocket portion forming area of the container film
Data Source
AI summary
A blister packing machine includes: a conveyor that conveys a belt-like container film having a pocket portion forming area and an expected mounting part; a preheating device that preheats the container film conveyed by the conveyor; a pocket portion forming device that forms a pocket portion in the container film softened by the preheating device; and a tension applier that applies a tension along a width direction of the container film to at least the pocket portion forming area. The pocket portion forming device forms the pocket portion while the tension applier applies the tension to the container film, the container film has an edge area between an edge in the width direction and the expected mounting part, and the tension applier includes a projection that applies the tension to the container film by pressing the edge area to form a protruding portion in the container film.