Extruded Hook Closure Structure Without Glue or Welding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing hook closure systems face challenges in attaching a plastic base to a product due to complex and costly processes, including the use of glue, which complicates recycling and poses reliability issues, and welding methods that are expensive and risky.
Innovation Solution
A hook-type retention device is formed as a single unit through extrusion, combining an elastic film, plastic tape, and retaining elements, with bonding achieved by partial encapsulation, eliminating the need for glue and simplifying the integration process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If glue is used to attach the plastic base to the product, then the attachment can be achieved, but the cost increases, reliability decreases, and recycling becomes difficult
Solution Approach 1:
The patent removes the adhesive layer from the closure system structure, extracting the problematic bonding agent that caused reliability and recycling issues. The hooks are designed to engage directly with the packaging surface without requiring glue, eliminating the source of attachment failures and contamination.
Solution Approach 2:
The patent replaces the chemical bonding mechanism (adhesive) with a mechanical engagement system (hooks that physically interlock with the packaging surface). This mechanical substitution provides more reliable attachment while eliminating the need for glue, thereby improving both reliability and recyclability.
2Ease of manufacture
If welding is used to attach the plastic base to the product, then the attachment can be achieved, but the cost increases and risks to the product and closure system arise
Solution Approach 1:
The patent removes the welding process from the manufacturing sequence, extracting the thermal energy source that poses risks to the product and closure system integrity. The cold-forming hook engagement method eliminates thermal damage risks entirely.
Solution Approach 2:
The patent replaces the thermal bonding process (welding) with a mechanical engagement system where hooks physically interlock with the packaging surface through cold-forming. This substitution eliminates the harmful thermal effects while achieving secure attachment.
3Adaptability or versatility
If adhesive layers and multiple material layers are added to the hook closure system, then the functional requirements can be met, but the device complexity increases
Solution Approach 1:
The patent merges the base structure and retention elements into a single integrated component made from a single extruded plastic material. The hooks are formed directly from the base material without requiring separate adhesive layers or additional material layers, thereby reducing device complexity while maintaining functional versatility.
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 extrusion-based method allows for efficient and cost-effective attachment of the hook closure system to products, ensuring reliability and ease of recycling without degrading the retention device or the product.
Implementation Method 1
an elastic film (310) attached to a packaging surface (P1), the film extending in a longitudinal direction and comprising a free end, the film exhibiting an elastic deformation of between 30% and 70% when stretched in the longitudinal direction
Data Source
Figure 1~5
Figure 6~10
Figure 11
AI summary
Disclosed is an attaching device (300) comprising: - a resilient film (310) that extends in a longitudinal direction; - a plastic strip (100) that extends in the longitudinal direction and includes a base (51) with a bottom face (512) and a top face (511); and - a plurality of attaching elements that extend from said top face (511); characterized in that the film (310), the base (51) and the attaching elements are formed as a single piece in an extrusion process.