“Companies committed to customer satisfaction with their best technical skills and quality”
“Unless it is the best product, it does not produce.”
CEO Message
Since its establishment in 1988, Plusdoor has grown based on continuous research and development, the best technology, and customer trust.
To produce products that always satisfy our customers to always produce products that satisfy our customers.We produce insulation products for energy saving in line with the changing times and have various test reports. We have built the latest facilities to produce perfect products and are doing our best in R&D. Our products are also loved for their sophisticated and luxurious designs that are not found in other companies.As our company motto says “A company that grows with its employees, a company that coexists with its customers”and we sincerely thank you for visiting us.
Company's history
2023
- Main plant completed in July
2022
- 3rd Plant & Corporate Affiliated R&D Center Completed
2021
- 110 mm insulation door U-factor 1.09 obtained
2019
- Achieved 1.31 U-factor for 90mm system door (26T)
- Established 2nd factory
- Acquired patent for Loy series manufacturing process / Acquired U-factor of 0.653 for improved products
- Acquired condensation test
- Developed 'PJ roll insect-screen'
2018
- Started production of system door
- Developed 'PVC laminated door’
- Developed 'Insect screen' for folding doors
2017
- Loy Door Development and U-factor of 1.11
- Started production of middle doors
- Acquired U-factor of insulated folding door
2016
- Expansion of Plant 1 / Development of insulated folding doors
- Development of insulation system door
2013
- Incorporation and name change to 'Cheongju Metal Plus Door’
- Developed and produced folding doors
- Acquired 4 front door design registrations
2012
- Relocation of headquarters expansion
2008
- Expansion of headquarters
- Developmen of Nine series
- Development of Azondoor
1996
- Relocation of headquarters expansion
- Change name to ‘Cheongju Metal’
1991
- Start advanced front door production
1988
- Established the 'Cheongju Jabala' factory
DIFFERENTIATION STRATEGY
superior competitiveness
Unique Design
Highest level of insulation
Investing in R&D
Communication with customers
Headquarters-managed A/S
Industry-leading delivery date
Organization chart
Company views
▲ Main Plant
▲ Second Plant
▲ Third Plant
Product Development
“Companies committed to customer satisfac tion with their best technic al skills and quality”
“Unless it is the best product, it does not produce.”
PlusDoor build and designs all products directly through the company's own R&D team.
3D Assembling
Finishing material design
3D Simulation
U-factor interpretation
Thermal conductivity interpretation
Structural interpretation
Production Lists
we produce all of our products ourselves.
Insulated Front Doors
General Doors
Folding Doors
Middle Doors
Gates
Fence
System Doors
PJ Insect Screen
Production facilities
Plus door pursues the perfect product with precision processing. A high performance machine has an error of 0.1mm Do not allow.
Laser marking machine
3D Printer
Laser cutting machine
CNC banding machine
CNC work machine
CNC engraver
Production facilities
The introduction of the latest facilities improves productivity and reduces defect rates.
Corner clamping machine
automatic profile cutting machine
crushing machine
Sharing machine
Double notching machine
Hot press
Screen cutting machine
Film cutting machine
Test reports
The patent certificate
The patented Loy Series
(patent No. 10-2035936)
The present invention relates to a front door, and more particularly, to a method for improving heat conduction by a metal surface having an iron plate or the like disposed on an outer surface of aThe present invention relates to a front door, and more particularly to a front door partthe heat conduction by the metal surface of a metal plate such as an iron plate arranged on the outer surface of the front door part.An improved insulation that enables airtightness to be improved by providing a windproof structure on the four sides of the front doorThe present invention relates to a front door having an improved insulation and windproof structure.
U-factor of insulated Folding doors
26T(1.49)
U-factor of insulated Folding doors
38T(1.27)
U-factor of insulated System doors
26T(1.31)34T(1.11)
U-factor of Loy series 0.653
Condensation Performance of Loy series
Frame 0.07, Door 0.17
110MM U-factor of Regen series 1.09
Loy Doors Certificate of Design Registration
General Doors Certificate of Design Registration
Gates Certificate of Design Registration
Awards
Loy series has one of the best insulation ratings in the industry (0.657 thermal transmittance), Class 1 airtightness, and condensation resistance.In addition, more than 100 designs and colors are available to choose from.
▲ Participation in
the "Korea Build" Exhibition
▲ Gyeonggi-Do Showroom
Sponsorship
▲ The Drama ( 
The Penthouse)
▲ The Drama
( 
One day, destruction came into my doorstep)
▲ Web site & SNS
▲ Video of Plusdoor introduction
