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Technology & Certifications
Technology & Certifications
"Quality and durability are both the beginning and the end of our process.
Doranblue delivers only proven trust in its products."
Kyungdae Tech has established rigorous quality standards and reliable technological capabilities across the entire process.
From planning and design to sample production, prototype development, and mass production, we operate and manage all R&D processes in-house to enhance product completeness and ensure consistent quality.
Based on Kyungdae Tech’s technological expertise, Doranblue operates a dedicated R&D department to further strengthen the durability and performance of our products.
As the starting point of innovation, our dedicated R&D department is a space where cutting-edge technology meets creative ideas to create new value, and our professional researchers design solutions for the future of our customers.
We are equipped with office equipment for precise analysis and testing. Our systematically managed devices support research and development in various fields, enhancing the reliability of product development and performance verification.

Doranblue Technology Development Process

Design and Material Optimization

Depending on the product’s purpose and function, we identify the most suitable materials and structures, creating designs that balance performance and durability. From basic design to the application of advanced technical elements, the entire process is carried out within our R&D department.

Sample and Prototype Production

Based on CAD/CAE design data, we produce precise samples and prototypes, and secure product reliability in advance through tests that simulate actual usage conditions.

Durability and Quality Testing

Doranblue applies its own durability evaluation standards and quality testing protocols to all fully developed products. By simulating various conditions such as long-term use, environmental changes, and equipment modifications, we predict the actual service life of the product and conduct thorough verification before mass production approval.

Same Standards for Customized Products

Products manufactured according to customer orders are also subject to Doranblue’s strict technical standards and quality verification procedures. This ensures that while meeting each product’s unique characteristics and customer requirements, we maintain Doranblue’s inherent reliability and stability.

Certification and Technical Quality Management

Doranblue not only maintains internal quality management standards for core components and product lines but also secures external certification systems, with plans to continuously expand domestic and international certification coverage. To ensure continuous technological advancement, we operate a full-cycle technical quality management system that includes quality data feedback, material performance analysis, and production process optimization.

Certifications & Intellectual Property
The technological achievements accumulated through research and development are protected by intellectual property rights, with a focus on registered patents and trademarks to strengthen Kyungdae Tech’s independent technology base.
In particular, patent-based design structures and applied technologies are directly reflected in actual products, delivering differentiated performance and durability, and contributing to the provision of customized technical solutions that meet a wide range of customer needs.
Going forward, Kyungdae Tech will further solidify its position as a company with technological reliability and sustainable growth capabilities by protecting its rights to technology and strengthening a certification-based quality system.

Certificates & Patents

Patent Certificate - Design
Jam Prevention Device for Cam Member of Toner Supply Unit
Patent Certificate - Design
Gap Prevention Device for Toner Supply Tray of Toner Supply Unit
Utility Model
Breakage Prevention Component for Toner Supply Unit
Patent Certificate - Design
Auxiliary Mounting Frame for Paper Feed Roller
Utility Model
Auxiliary Mounting Frame for Paper Feed Roller in Office Equipment
Patent Certificate - Design
Paper Feed Guide for Printer
Patent Certificate - Design
Paper Feed Roller
Patent Certificate - Design
Paper Feed Roller
Patent Certificate
Doranblue Logo Trademark
Patent Certificate
Slip Prevention Device for Copier Toner Cartridge Chip Connection Interface Board
Patent Certificate
Finger Mounting Structure for Copier Mounting Unit
Patent Certificate
Paper Feeding Device for Office Automation Equipment
Patent Certificate
Improved Operating Structure of Pre-Paper Feed Roller for Copier Cassette
Patent Certificate
Damage Prevention Device for Paper Feed Detection Sensor of Copier
Patent Certificate
Paper Feed Roller for Copier
Patent Certificate
Paper Feed Roller for Copier
Patent Certificate
Damage Prevention Device for Paper Feed Cassette in Copier
Patent Certificate
Magnetic Finger for Paper Fixing Unit in Copier
Patent Certificate
Paper Feeding Device for Office Automation Equipment