PET Adhesive Tape Roll Noiseless Unwinding
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Solution Overview
Problem
Conventional self-adhesive tapes for packaging face limitations in length per roll diameter, mechanical resistance, environmental impact, adhesive efficacy, and production efficiency, with issues related to noise during unwinding and the need for corona treatment.
Innovation Solution
A self-adhesive tape using a polyethylene terephthalate (PET) film with a variable thickness and adhesive layer, allowing for longer rolls, improved mechanical resistance, reduced waste, and noiseless unwinding without corona treatment, utilizing either acrylic or hot-melt glue, and enabling printing on the outer face.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional self-adhesive tapes use polypropylene base structure with release agents, then the tape can unwind smoothly, but the tape produces noise during unwinding and requires corona treatment for polarisation
Solution Approach 1:
The patent changes the base material from polypropylene to polyethylene terephthalate (PET), which has inherently different surface properties. This parameter change eliminates the need for corona treatment to achieve proper polarisation and significantly reduces unwinding noise without compromising adhesion performance
Solution Approach 2:
The invention uses acrylic adhesives that do not require release agents, simplifying the tape structure and eliminating the source of noise generation associated with traditional release agent systems while maintaining functional performance
2Strength
If conventional tapes use thicker substrate for mechanical strength, then the tape has adequate tensile resistance, but the roll length is limited and waste material increases
Solution Approach 1:
The patent creates a composite structure using PET film combined with acrylic adhesive layers, achieving superior mechanical strength and adhesion properties that allow thinner substrates to perform as well as or better than conventional thicker polypropylene tapes
Solution Approach 2:
By changing from polypropylene to PET base material, the invention achieves higher specific strength (strength-to-weight ratio), enabling the use of thinner films that extend roll length while maintaining adequate mechanical resistance for packaging applications
3Reliability
If conventional tapes require corona treatment for adhesive application, then the adhesive adheres properly to the substrate, but production time increases and operational complexity increases
Solution Approach 1:
The patent changes the surface energy characteristics of the base material by using PET instead of polypropylene. This inherent surface property provides sufficient polarisation for acrylic adhesive adhesion without requiring additional corona treatment steps, thereby increasing production speed and simplifying the manufacturing process
4Ease of operation
If conventional tapes use release agents for unwrapping, then the tape can be unwrapped easily, but the adhesive efficacy on the packaging surface is reduced
Solution Approach 1:
The invention eliminates release agents entirely by using acrylic adhesives on PET base material that do not require them for proper function. This removal of the release agent layer prevents contamination of the packaging surface and maintains full adhesive efficacy while still allowing easy unwrapping through the inherent properties of the acrylic adhesive system
Data Source
Figure 1~4
AI summary
A roll of self-adhesive tape for packaging, and similar uses of the type formed by an inner core on which is wound a tape in plastic material rendered adhesive by means of association of an adhesive, characterized in that said tape (3) is composed of a non-textile film (3) in Polyethylene terephthalate or PET having a thickness between 5 and 23 microns and a layer of glue having a weight between 8 and 32 grams per square meter.