YOSHINO GYPSUM CO., LTD.

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About Us

Research & Development

We have three key bases for developing our advanced technologies for gypsum productions:
The Research and Development Centre, The Total Quality Testing Centre and The Engineering Department


Research and Development Centre
[Principal Activities]
Improving the quality of our plasterboards and gypsum plasters, along with seeking solutions for technical problems
Developing new products to meet future market needs
Developing products which lead to the expansion of our sales of industrial gypsum

At the research and development centre, our principal activities are to improve product quality and to seek solutions for technical problems. The centre is also actively engaged in seeking patents for its research achievements and for gaining publicity in relation to research papers at various academic conferences.


Total Quality Testing Centre
[Principal Activities]
Various kinds of product performance are verified carefully through a course of comprehensive tests at our Total Quality Testing Centre, which help us gain understanding and allow us to develop more sophisticated products using plasterboards. The products may include wall systems for Fire-Resistance, Sound Insulation, Earthquake Resistance and Sound Absorption - along with ceiling systems. This enables us to assure quick responses to our customers' needs.


[Facilities and Equipment at Total Quality Testing Centre]
1 Acoustical Laboratory
Our acoustical laboratory has facilities with the ability to measure world-class sound insulation performance, comparable to a music studio with TLD80 (RW = 90).

TLD80
TLD is the evaluated value specified by the Architectural Institute of Japan to represent sound insulation performance of stand-alone walls when tested in an acoustic laboratory. The higher the value of TLD, the greater the sound insulation performance.
TLD80 is equivalent to the sound insulation performance of a concrete wall 5,000mm thick.

2 Testing Equipment for Measuring Comprehensive Structural Performances
Challenges for creation of lighter, more strengthened and more endurable building materials and construction systems
The performance tests for full-scale models can be carried out by our testing equipment in response to the demands for larger buildings.
The following equipment is used for a variety of tests, including a test for structural strength or rigidity based on assumption that a various factors are applied, e.g. when impact or pressurization from earthquake is applied, and comparative tests for each wall materials' quality, thickness, structure, etc.

  • Testing Equipment for Structural Performance of Shear Walls
    Testing equipment for measuring shearing strength of walls in wood framed housings or 2X4 housings.
  • Testing Equipment for Structural Performance of Walls Under In-Place Force
    This equipment is used to observe extent of damage under the simulated conditions such as earthquake.
  • Testing Equipment for Structural Performance (Flexural Rigidity) of Walls Under Out-Plane Force
    Testing equipment for measuring deflection to walls when loads is applied vertically to testing walls. Testing wall board up to 5 m high can be tested.

3 Full Scale Furnace for Testing Fire Resistance
The effectiveness of Non-combustible Wall Systems can be demonstrated under a variety of conditions

The full scale furnace allows us to conduct experiments on walls of an area up to 9m2
The furnace can carry out fire-resistance tests in accordance with the new regulations required by the revision of Japanese Building Standard Law, 2000.

[General Description of Total Quality Testing Centre ]
General Description of Total Quality Testing Centre
Location: Chiba II factory, 52, Minamisode, Sodegaura-shi, Chiba 299-0268 JAPAN
Building: Total Floor Area 1,273m2 Partially Two-Storied Steel Construction
Completion of Construction: 25th January in 2001

[Facilities and Equipment]
1) Acoustical Laboratories
The testing room meets the specification of room type I, specified by JIS A1416:2000 (Reverberation Room)
Supervision of Design: Professor Hideki Tachibana at Institute of Industrial Science Department of Human and Society, the University of Tokyo

· Measurement Limit: TLD80/
·Diffusion (Acryl) Plate: A sheet of diffusion plate is installed in both the sound source room and the sound receiving room.
·Sound Source Room: Capacity:286m3 Surface Area:265m2
Sound Receiving Room: Capacity:304m3 Surface Area:276m2


2) Testing Equipment for Measuring Comprehensive Structural Performances
Testing Equipment for Structural Performance of Shear Walls

·Maximum Load: 10,000kgf
·Maximum Vibration Amplitude: ±200mm
·Maximum Size of Test Specimen: 3,000 (width) × 2,730 (height) mm


Testing Equipment for Structural Performance of Walls Under In-Place Force (Non-Shear Walls)
·Maximum Load: 10,000kgf
·Maximum Vibration Amplitude: ±200mm
·Maximum Size of Test Specimen: 3,000 (width) × 2,730 (height) mm


Testing Equipment for Structural Performance (Flexural Rigidity) of Walls Under Out-Plane Force
·Maximum Load:5,000kgf
·Maximum Size of Test Specimen: 3,000 (width) × 5,000(height) mm


3) Full Scale Fire Resistance Furnace
·Subject Parts: Walls
·Effective Size for Fire Test 3,050 (width) × 3,000 (height) mm
·Combustion Equipment: Natural Gas·Flat Frame Gas Burner 16
·Heating Curve: Standard heating curve specified in ISO·834


Engineering Department
[Principal Activities]
The engineering department's principal activities are the Control of Plants, Design of the Plant Facility and Safety Control.
Control of Plants includes providing guidance on plant design, plant system improvement and maintenance work for plants, and providing support for them.
Design of Plant Facilities includes research, design, and evaluation for new plants or production facilities for new products.
Safety Control includes drawing up criteria for company-wide safety standards and making manuals for them.



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