Twisted Paper Cable Tie With Strong Locking and Easy Insertion

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Solution Overview

Problem

Conventional plastic cable ties pose environmental hazards and are not easily tamper evident, while also lacking sufficient strength and usability.

Innovation Solution

A cable tie with a twisted paper strip cord, having 55-75 turns per meter, and a locking head with a protrusion such as a metal blade, providing high strength and locking force, and ensuring easy manual insertion.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If conventional plastic cable ties are used, then sufficient strength and locking force can be achieved, but environmental harm increases and carbon footprint increases

Engineering Contradiction:

Improveenvironmental harmVSAvoidcable tie strength

Core Design Contradiction:

Object-affected harmful factorsVSStrength

Solution Approach 1:

The patent changes the material parameter from conventional plastic to paper strip, and optimizes the structural parameter of twisting turns (55-75 turns per meter) to achieve both environmental friendliness and sufficient strength. This parameter optimization resolves the contradiction by finding the optimal point where environmental benefits are maximized while mechanical strength remains adequate for cable tying applications.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The cable tie combines paper strip material with a metal blade protrusion in the locking head, creating a composite structure. The paper strip provides flexibility and environmental friendliness, while the metal blade provides the necessary cutting edge for secure locking. This composite approach resolves the strength contradiction while maintaining environmental benefits.

Inventive Principle:

Principle #40Composite materials

2Strength

If the cord is made from twisted paper strip with high number of turns, then strength and locking force increase, but insertion force required increases

Engineering Contradiction:

Improvelocking forceVSAvoidinsertion ease

Core Design Contradiction:

StrengthVSEase of operation

Solution Approach 1:

The patent precisely optimizes the twisting parameter to 55-75 turns per meter, which is the critical threshold where sufficient locking force is achieved while insertion force remains manageable. This parameter optimization resolves the contradiction by identifying the optimal range that balances strength requirements with user-friendly insertion characteristics.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent applies partial twisting rather than excessive twisting. By limiting the turns to 55-75 per meter rather than higher values, the cord achieves adequate locking force without over-twisting, which would make insertion difficult. This partial action approach resolves the contradiction by applying just enough twist to achieve the necessary function without excessive complexity.

Inventive Principle:

Principle #16Partial or excessive action

3Ease of operation

If the cord is made from twisted paper strip with low number of turns, then insertion force decreases, but locking force and strength decrease

Engineering Contradiction:

Improveinsertion easeVSAvoidlocking force

Core Design Contradiction:

Ease of operationVSStrength

Solution Approach 1:

The patent establishes the minimum effective parameter at 55 turns per meter, below which locking force becomes insufficient. This lower bound of the parameter range ensures that the cord is twisted enough to provide adequate strength and locking capability while remaining easy to insert, resolving the contradiction between ease of operation and locking force.

Inventive Principle:

Principle #35Parameter changes

4Object-affected harmful factors

If plastic cable ties are used, then sufficient locking force is achieved, but environmental friendliness decreases

Engineering Contradiction:

Improveenvironmental friendlinessVSAvoidtamper evidence

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The patent employs a disposable paper-based cable tie that is designed for single use and then disposed of in an environmentally friendly manner. The paper material is biodegradable and does not persist in the environment like plastic, thus improving environmental friendliness while maintaining adequate reliability during its service life through the optimized twisting structure and metal blade locking mechanism.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Data Source

PatentEP4656549A1Cable tie

Publication Date: 2025.12.03 EVLR INT AB

Figure 1~2b
Figure 3

AI summary

A cable tie (100) comprising: - a cord (101) having a first end (202) and a second end (103), and - a locking head (104) fixedly attached to the first end (102), said locking head (104) being adapted to receive the second end (103) and retain the cable tie (100) in a closed loop configuration, wherein the locking head (104) defines (a) wall(s) (105) that encircles a passage (106) having an inlet (107) and an outlet (108), and comprises a protrusion (109) that extends into the passage (106) for engaging the cord (101) and which is arranged to allow displacement of the cord (101) in a first direction towards the outlet (108) while preventing displacement of the cord (101) in a second direction towards the inlet (107), and wherein the cord (101) comprises a paper strip (10) twisted along its length, the number of turns per meter of the twisted paper strip being 55-75.