Package Container Coating to Prevent Spout-Seal Shrinkage
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Solution Overview
Problem
Packaging bags made of composite films with different resin types face issues in recycling due to shrinkage and reduced strength when a spout is sealed, leading to appearance deterioration and reduced resistance.
Innovation Solution
A packaging container with a packaging bag formed of a packaging film having a sealant in the innermost layer and a spout or discharge port opening member, featuring a heat-resistant coating layer on the outermost side, made of a curable resin or high-melting-point resin, to inhibit shrinkage during sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a spout is sealed to a laminated film made of polyethylene resin, then the packaging bag can be formed with mono-material for recycling, but the laminated film shrinks around the sealed place reducing its strength and appearance
Solution Approach 1:
The invention applies a heat-resistant coating layer specifically at the sealed portion where the spout is attached to the packaging bag. This localized treatment provides heat resistance exactly where needed during the sealing process, preventing shrinkage at the critical sealed area while leaving the rest of the mono-material film intact for recycling. The coating layer has different thermal properties than the surrounding polyethylene resin, creating local quality differentiation that solves the shrinkage problem without compromising overall recyclability.
2Adaptability or versatility
If a spout is sealed to a laminated film made of polyethylene resin, then the packaging bag can be formed with mono-material for recycling, but the appearance deteriorates due to shrinkage
Solution Approach 1:
The heat-resistant coating layer is applied locally at the sealed portion to prevent shrinkage-induced appearance deterioration. By providing thermal protection only where the spout contacts the film, the coating prevents localized shrinkage and maintains the aesthetic appearance of the sealed area, while the rest of the packaging bag remains as mono-material suitable for recycling.
3Strength
If a heat-resistant coating layer is applied to prevent shrinkage, then the strength and appearance are maintained, but the device complexity increases
Solution Approach 1:
The heat-resistant coating layer is applied in advance to the sealed portion of the packaging film before the spout sealing process. This preliminary action ensures that the coating is already in place to prevent shrinkage during sealing, eliminating the need for complex real-time control systems or post-sealing correction mechanisms. The coating is applied once during manufacturing, simplifying the overall process while maintaining strength.
4Shape
If a heat-resistant coating layer is applied to prevent shrinkage, then the appearance is maintained, but the manufacturing process becomes more complex
Solution Approach 1:
The heat-resistant coating layer is applied in advance to the sealed portion of the packaging film during the film manufacturing process, before the packaging bag is assembled and sealed. This preliminary application integrates the heat-resistant function into the existing film production line without requiring additional complex manufacturing steps later in the packaging process, thereby maintaining ease of manufacture while achieving the desired appearance protection.
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 heat-resistant coating layer prevents shrinkage and maintains strength, appearance, and drop resistance of the packaging bag when the spout or discharge port is sealed, facilitating mono-material recycling.
Implementation Method 1
the packaging bag includes a heat-resistant coating layer that includes a region superposed on the spout or the discharge port opening member via at least the sealant and is partially formed with respect to an area of the packaging film
Implementation Method 2
When the composite film is sealed, the sealant is melted to bond to the inner surface of the composite film
Data Source
Figure 1~2
Figure 3~4
AI summary
This packaging container has a packaging bag (20) formed of a packaging film (23) having a sealant (21) in an innermost layer, and a spout (10) or a discharge port opening member sealed to the packaging bag (20). The packaging bag (20) has a heat-resistant coating layer (30) that includes a region superposed on the spout (10) or the discharge port opening member via at least the sealant (21) and is formed partially with respect to an area of the packaging film (23).