Adhesive-Free Fusion Bonded Label for Plastic Articles
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Solution Overview
Problem
Existing methods for fusion bond marking on plastic objects are costly and uneconomical for mass-produced articles, as they require thick-walled regions and are difficult to detach, making them unsuitable for thin-walled or complex shapes.
Innovation Solution
A fusion bond marking system using an adhesive-free transparent plastic film with embedded identification means that can be melted onto the object, allowing for permanent and cost-effective marking of plastic objects regardless of their thickness or shape, including the use of barcode, data matrix codes, and RFID inlays for secure and readable identification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional fusion bond marking methods are used, then clear and unambiguous identification is achieved, but the method requires thick-walled regions and is uneconomical for mass-produced items
Solution Approach 1:
The marking system is segmented into a separate plastic film component that can be applied independently to the plastic article. This allows the marking function to be decoupled from the article manufacturing process, enabling economical mass production of both the articles and the markings separately, then combining them through fusion bonding.
Solution Approach 2:
The marking film is prepared in advance with pre-applied marking material (ink, barcode, RFID, etc.) before being fused to the plastic article. This preliminary preparation of marking elements on the film allows for efficient batch processing and eliminates the need for thick-walled regions during the article molding process.
2Ease of manufacture
If marking material is applied directly during injection molding, then fused-to-metal markings are formed, but the method is only economical for thick-walled articles
Solution Approach 1:
The marking system is divided into a separate film component that can be independently manufactured and then fused to articles of any wall thickness. This segmentation allows thin-walled articles to receive markings without requiring additional material or complex molding processes.
Solution Approach 2:
The marking approach transitions from in-mold marking (three-dimensional integration during molding) to post-molding fusion bonding (surface-level application). This dimensional shift allows markings to be applied to articles regardless of wall thickness, as the marking film bonds to the external surface rather than requiring integration during molding.
3Adaptability or versatility
If adhesive labeling is used, then marking can be applied to any plastic article, but the marking can be removed and is not permanent
Solution Approach 1:
The marking film utilizes phase transition (melting) of thermoplastic material to achieve permanent bonding. When heated, the thermoplastic film melts and fuses with the plastic article surface, creating an irreversible bond that cannot be removed without damaging the article, unlike adhesive labels that can be peeled off.
Solution Approach 2:
The marking system employs composite material construction with a thermoplastic film base and integrated marking material (ink, barcode, RFID inlay). This composite structure fuses as a unified layer to the article, ensuring the marking becomes an inseparable part of the article surface while maintaining versatility across different plastic types.
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 system enables efficient and secure marking of plastic objects, ensuring the identification remains inseparable until the object is damaged, offering a cost-effective solution for mass-produced items and providing high-speed application, suitable for various plastic products, including bottles and packaging materials.
Implementation Method 1
The marking material can be fused to the object by melting the inner surface of the plastic film onto or into a preheated surface area of the object
Implementation Method 2
The marking material can be fused to the object by melting the inner surface of the plastic film onto or into a preheated surface area of the object
Data Source
Figure 1~3
Figure 4a~4
Figure 5
AI summary
The invention relates to a fusion-linked marking of a plastic article (2). The fusion-linked marking (1) comprises a transparent plastic film piece (3) with an inner surface (4) and an outer surface (5). The inner surface (4) and the outer surface (5) of the plastic film piece (3) are adhesive-free. The inner surface (4) and/or the outer surface (5) has a marking element (6), wherein the inner surface (4) of the plastic film piece (3) forms a fusion bond with the plastic article (2).