3D-Printed Printing Sleeves Without Mandrels or Zipper Defects
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Solution Overview
Problem
The existing methods for manufacturing commercial printing sleeves require multiple mandrels with strict diametrical tolerances, leading to high costs, inventory management challenges, and environmental waste due to the use of thermoset materials, while 3D printing technologies face issues with zipper defects and inadequate adhesion between material layers, resulting in structural weaknesses and waste.
Innovation Solution
A 3D printing technique is employed to form sleeves with multiple distinct regions simultaneously, using multiple printing heads to extrude material helically, eliminating the need for mandrels and ensuring uniform adhesion through a temperature control sub-assembly and heated air circulation, preventing zipper defects and structural anomalies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional mandrel-based methods are used to manufacture sleeves, then manufacturing precision is achieved, but device complexity and manufacturing costs increase due to the need for multiple mandrels with strict tolerances
Solution Approach 1:
The patent removes the mandrel from the manufacturing process entirely. Instead of using mandrels to form sleeves, the invention uses a mandrel-less additive manufacturing process where material is deposited directly onto a build plate to form the sleeve structure, eliminating the need for mandrel inventory while maintaining precision through digital modeling and controlled material deposition
Solution Approach 2:
The patent replaces the mechanical mandrel-based forming system with a digital additive manufacturing system. The mechanical process of wrapping material around mandrels is substituted with computer-controlled material deposition using extrusion or injection mechanisms, where digital models guide the formation of sleeves with precise dimensions without requiring physical mandrels
2Strength
If thermoset materials are used in traditional sleeve manufacturing, then structural strength is achieved, but environmental friendliness deteriorates due to non-recyclability and waste generation
Solution Approach 1:
The patent changes the material parameter from thermoset polymers to thermoplastic polymers. Thermoplastics can be melted and reformed, enabling recycling and reducing environmental waste, while maintaining the structural strength required for printing sleeves through appropriate material selection and layer configuration in the additive manufacturing process
Solution Approach 2:
The patent enables material recovery by using thermoplastic materials that can be melted and reused. Unwanted or worn sleeves can be recovered, melted down, and reformed into new sleeves, creating a closed-loop manufacturing system that reduces waste and environmental impact while maintaining structural integrity
3Adaptability or versatility
If multiple mandrels are used for different sleeve diameters, then adaptability is improved, but loss of time increases due to mandrel setup and inventory management
Solution Approach 1:
The patent creates a universal additive manufacturing system that can produce sleeves of various diameters using the same build plate and material deposition process. By programming the extrusion mechanism to deposit material in different spiral patterns and diameters, the system can manufacture different sleeve sizes without changing physical equipment, eliminating setup time while maintaining versatility
Solution Approach 2:
The patent implements dynamic control of the material deposition process, where the extrusion rate, deposition pattern, and layer thickness are adjusted in real-time based on the desired sleeve dimensions. This dynamic programming allows the same manufacturing system to adapt to different sleeve diameters and configurations without physical reconfiguration, reducing setup time while maintaining product variety
4Ease of manufacture
If conventional 3D printing is used without temperature control, then manufacturing simplicity is maintained, but manufacturing precision deteriorates due to zipper defects and inadequate adhesion
Solution Approach 1:
The patent introduces temperature control as a critical parameter in the additive manufacturing process. By controlling the temperature of the build plate, extrusion nozzle, and surrounding environment, the patent ensures proper adhesion between layers and prevents zipper defects, achieving manufacturing precision while maintaining the simplicity of the additive manufacturing approach through automated thermal management
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 method reduces manufacturing costs, minimizes waste, enhances durability, and allows for recyclability, while ensuring precise fit and reduced energy consumption, making the sleeves more environmentally friendly and safer to handle.
Implementation Method 1
a temperature control sub-assembly and heated air circulation
Data Source
AI summary
A sleeve for mounting on a mandrel of a commercial printing machine can include distinct annular regions that are integrally formed simultaneously as a unitary structure without a forming mandrel and without any need to be adhered to one another in manufacturing steps separate from the manufacture of each annular region of the completed sleeve. A 3D printing machine and method suitable for one or more of the flexible packaging industry, the offset printing industry, the publication printing industry, the décor printing industry, and the corrugated printing industry, employs a build plate that descends from a horizontal printing plane where each of multiple printing heads extrudes a road cycle of thermoplastic material onto the immediately underlying road cycle of the sleeve.