Pressure-Sensitive Adhesive Label for PET Bottle Recycling
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Solution Overview
Problem
The recycling rate of PET bottles is hindered by the difficulty in removing adhesive labels without leaving residue, which contaminates the bottles and affects recycling quality and efficiency.
Innovation Solution
A label coated with a pressure-sensitive adhesive, applied in a roll-type format using a synthetic resin film with non-shrinkable or shrinkable film, allowing for easy removal without adhesive residue, and a heat-shrinking process for curved bottles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a slow dry adhesive is used to attach the label to the PET bottle, then the labeling process can proceed at high speed, but the adhesive remains on the container surface after label removal, affecting recycling quality
Solution Approach 1:
The patent changes the adhesive type from slow dry adhesive to pressure-sensitive adhesive, fundamentally altering the adhesive's physical and chemical properties. This parameter change enables the adhesive to bond strongly during application but release cleanly upon label removal, eliminating residue while maintaining high-speed labeling capability
Solution Approach 2:
The label itself is designed as a disposable component with a finite service life. The pressure-sensitive adhesive is engineered to provide sufficient bonding during the product's usage period, then fail cleanly when the label is removed for recycling, allowing the adhesive to fulfill its purpose temporarily and then detach without residue
2Reliability
If a sticker label with adhesive is used, then the label can be attached to the container, but it is not easy to remove and adhesive remains on the container surface
Solution Approach 1:
The patent changes the adhesive type from slow dry adhesive to pressure-sensitive adhesive, fundamentally altering the adhesive's physical and chemical properties. This parameter change enables the adhesive to bond strongly during application but release cleanly upon label removal, eliminating residue while maintaining high-speed labeling capability
Solution Approach 2:
The adhesive system is designed with dynamic characteristics - it provides strong bonding under normal conditions (when the bottle is in use) but allows easy detachment when removal force is applied. The pressure-sensitive adhesive transitions from a bonded state to a removable state based on the applied force and duration, enabling both reliable attachment and easy removal
3Device complexity
If the label is not removed before recycling, then the recycling process is simpler, but the recycling rate and quality of PET bottles are adversely affected
Solution Approach 1:
The patent converts the previously harmful effect of adhesive residue into a beneficial property. By using pressure-sensitive adhesive that releases cleanly, the label removal process becomes advantageous rather than detrimental. The adhesive that once caused contamination now enables easy separation, turning the labeling process into an asset for recycling rather than a liability
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 solution significantly increases the PET bottle recycling rate, improves recycled PET quality, and reduces recycling costs by eliminating adhesive residue and optimizing the labeling process.
Implementation Method 1
A label coated with a pressure-sensitive adhesive, applied in a roll-type format using a synthetic resin film
Implementation Method 2
a heat-shrinking process for curved bottles
Data Source
AI summary
The present invention relates to a label made of a synthetic resin film in a roll-type, and disclosed is a label 20 coated with a pressure sensitive adhesive, wherein an adhesive portion 21 of a certain width coated with the pressure sensitive adhesive is formed at the intervals of one label which is to be attached to a PET bottle, and wherein the adhesive portion 21 consists of a front end adhesive portion 21a which is attached to the PET bottle and a rear end adhesive portion 21b which is attached to overlap on the front end adhesive portion 21a, and cutting is made at a cutting line 22 between the front end adhesive portion and the rear end adhesive portion 21b. As the synthetic resin film, a general non-shrinkable film as well as a heat-shrinkable film may be used.