RFID Inlay Injection Molding Parallel Flow

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Solution Overview

Problem

Existing methods for integrating two-dimensionally extending electronic elements, such as RFID tags, into plastic containers are complex and costly, often resulting in a loose connection that can be manipulated or detached, compromising security and originality.

Innovation Solution

A method where the two-dimensionally extending electronic element is directly introduced into a recess on the inner face of a mold, with molten plastic injected parallel to the element, eliminating the need for protective coverings and ensuring a secure, intimate connection by minimizing stress and shearing forces during the injection molding process.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the two-dimensionally extending electronic element is accommodated in a protective covering (plastic housing), then the electronic element is protected during injection molding, but the production process becomes elaborate and costly

Engineering Contradiction:
Improveprotection of electronic elementVSAvoidproduction process complexity
Core Design Contradiction:
ReliabilityVSDevice complexity

Solution Approach 1:

The patent removes the protective housing from the system entirely. The electronic element is placed directly into a recess in the mold core without any protective covering, and the injection-molded plastic container directly encapsulates and protects the element. This eliminates the intermediate protective housing component and simplifies the production process while maintaining protection of the electronic element.

Inventive Principle:
Principle #2Taking out (Extraction)

2Ease of manufacture

If the electronic element is bonded onto the container, then the connection is simple, but the element can be detached without damage compromising security

Engineering Contradiction:
Improvesimplicity of connectionVSAvoidsecurity and originality
Core Design Contradiction:
Ease of manufactureVSReliability

Solution Approach 1:

The patent merges the electronic element directly into the plastic container structure through injection molding. The molten plastic material flows around and encapsulates the electronic element, creating an integral, inseparable connection. The element and container become a unified structure where the element cannot be removed without damaging either the element or the container, thereby ensuring security and originality while maintaining manufacturing simplicity.

Inventive Principle:
Principle #5Merging (Combining)

3Reliability

If the electronic element is injection-molded onto the container, then a secure connection is achieved, but the element may be damaged by impact from molten plastic material

Engineering Contradiction:
Improveconnection securityVSAvoidstress and shearing forces on electronic element
Core Design Contradiction:
ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent prepares the mold core with a recess before injection molding begins. The electronic element is placed into this pre-formed recess, which positions the element in a protected location. The recess acts as a buffer zone that absorbs the impact of incoming molten plastic material, preventing direct high-velocity impact on the electronic element while still allowing the element to be encapsulated and securely connected to the container.

Inventive Principle:
Principle #10Preliminary action

4Ease of operation

If a barcode is used on the container, then data can be optically scanned, but the barcode can be manipulated and cannot be read after soiling

Engineering Contradiction:
Improvedata reading capabilityVSAvoiddata security and readability
Core Design Contradiction:
Ease of operationVSReliability

Solution Approach 1:

The patent replaces the optical/mechanical barcode system with an electronic identification system (such as RFID tags or other electronic elements). Instead of using optical patterns that require line-of-sight scanning and can be visually manipulated, the invention uses electronic components that provide contactless reading capability, enhanced security features, and immunity to soiling or physical degradation. This substitution of mechanical/optical systems with electronic systems resolves the limitations of barcode technology.

Inventive Principle:
Principle #28Mechanics substitution (Replace mechanical system)

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 approach results in a securely integrated electronic element that is difficult to detach without damage, enhancing the security of the container and its content, while simplifying the production process and reducing costs, making it suitable for large-scale production.

Implementation Method 1

the molten plastic material is injected into the mold cavity in such a way that it flows essentially parallel along a surface of the two-dimensionally extending electronic element that faces the mold cavity

Methodology Applied
Scientific EffectFluid flow:

Implementation Method 2

injecting a molten plastic material into the mold cavity of the injection mold and subsequently cooling the plastic material

Methodology Applied
Scientific EffectCooling and solidification: Freezing

Data Source

PatentUS9908271B2Method for producing a plastic container having a two-dimensionally extending electronic element, plastic container produced according to said method and injection mold for carrying out the method
Publication Date: 2018.03.06 WEIDMANN PLASTICS TECH
  • US9908271B2 patent drawing
  • US9908271B2 patent drawing
  • US9908271B2 patent drawing

AI summary

In order to produce a plastic container (1,2) having a planar electronic element (15), a planar electronic element (15) is introduced into a recess (29) of an inner face of a mold. The mold comprises an outer mold part (10) and a mold core (11), which form a mold cavity (12). Molten plastic material is injected into the mold cavity (12). After the subsequent cooling of the plastic material, mold removal is carried out. The recess (29) is arranged on an inner face (26) of the outer mold part (10). The molten plastic material is injected into the mold cavity in such a way that the molten plastic material flows substantially parallel along a surface (25) of the planar electronic element (15) facing the mold cavity (12). The planar electronic element (15) is an RFID inlay, for example. The planar electronic element does not require a protective casing and can be sprayed directly.