by Engr. Kh. Mashiur Rahman | Apr 20, 2019 | LAB
Portable Spectrometer
The specifications of portable spectrometer are as under:
- Geometry:
- Illumination:
- Spectral Engine: Spectral Range: Spectral Interval: Measurement Range:
- Calibration Interval:
- Measurement Spot Size: Measurement Distance:
- Repeatability: Inter-instrument
- Agreement:
- Gloss Geometry: Gloss Repeatability: Gloss Reproducibility: Operating Temp: Humidity:
- 45/0° dual illumination
- Full spectrum LED
- True Dual beam, 31 channel 400 – 700 nm
- 10 nm measured, 10 nm output 0-150% reflectance
- Once per week or temperature shift > 14° C (25.2° F) (self detected)
- 6 mm (1/4″) and 12 mm (1/2″)
- 38 mm (1 1/2″) nominal lens to measurement surface
- 6 mm 0.035 Mat) Maximum 12 mm 0.025 AEab Maximum (white ceramic tile)
- 6 mm 0.15 avg AEab (12 BCRA tiles) 12 mm 0.15 avg aEab (12BCRA tiles)
- 45/0°, 60° Correlated
- 0-10 GU, +/- 0.2 GU, 10-100 GU, +/- 0.6 GU 5-92 GU, 3.0 GU maximum, 1.5 GU average 10° – 40°C (50° – 104°F)
- 0-85% relative non-condensing
Other Term
In a counterflow washing process, fresh water is introduced only at the exit wash unit and counterflows back toward the dirtier units. This process increases water consumption at each separate washing stage, but the overall water consumption is reduced considerably.
In textile dyeing and printing, counterflow washing is applied because most of the water consumption is related to the washing of the materials. Besides, counterflow washing provides a more efficient cleaner wash. Since 1985, the use of counterflow washing machines has resulted in a decrease of water consumption and a corresponding reduction in the volume of the wastewater. Many textile companies have adopted the counterflow washing process. The further development of these washing machines has resulted in the optimisation of the washing process leading to a further reduction of the water consumption.
With the implementation of the counterflow washing process, a water savings of 75% can be achieved.
Conclusion
Portable spectrometer – Counterflow washing can be applied to all washing processes in the textile industry, with the exception of washing processes that take place in yarns painting equipment, flake painting equipment and reel barrels. Converting a conventional washing process to a counterflow washing process has a payback period of several years.
by Engr. Kh. Mashiur Rahman | Apr 15, 2019 | LAB
Characteristic
|
Tender Specifications
|
Instrument
Type
|
d/8°
spectrophotometer
|
Spectral
Analyser
|
Dual Beam analyser
|
Able to work between 360-700 nm
|
Reflectance
|
Yes
|
Tranmittance
|
Yes
|
Measuring resolution
|
2 rm
|
Spectral Interval
|
10 nm
|
Illumination Source
|
Pu se Xenon filtered to D65
|
Sphere Diameter
|
Minimum 150 nm
|
Photometric Range
|
0-200
|
Inter-instrument agreement CIE AE
|
0.08
|
UV cutoff Filters
|
400 nm, 420 nm, 460 nm
|
Reflactance
Apertures
|
26mm, 16 mm, 5 mm, 2.5 mm
|
Transmission Apertures
|
22 mm
|
Sample Positioning
|
Adjustable with camera
|
Display
|
Builtin Color LCD Display
|
Lens
|
Auto Zoomable
|
Softwares
Data Acquisition System
|
Co or Measurement
|
Prediction/Matching Database
|
Co–npatible with
equipment • All softwares pre- nstalled & upgradable
|
Accessories
|
All accessories to make and keep the unit
operational
|
Most defects arising in the production process of textiles and apparels are detected by inspectors. In order to promote consistent inspection decision from factory inspector, we recommend our factory to provide adequate inspector training in recognizing fabric and apparel defects and cause.
Under the new concept of Auto Sportswear Quality Assurance program and partnership with our factories, Definition and Classification of Defects are developed and established as follows: Read more about Non-Contact Portable Spectrometer
Defect Definition:
Critical Defects: A
defect that fails to meet mandatory regulations and/ or affects the safety of
the consumer. Results in automatic
rejection of inspection.
Major Defects: Any defect severe enough that it would result in customer dissatisfaction, or generally classify the garment as a second, or of less quality.
Minor Defects: An imperfection that may or may not cause a second, depending upon it’s location in the finished garment.
Apparel Defect Classification
A simplified list of defects, explanation and the judgments
are used in classifying apparel defects found in final inspection.
Fabric defects Classification
A fundamental list of defects, explanation and the judgments
are used in classifying both woven and knit fabric defects.
Factory Quality Control Manager should offer continuous
inspection training with showing written standards, using sample fabric
standards / defective garment samples and photograph.
*Note “Sewing Defect Manual” and “Seam Puckering Technical
Bulletin” are property of American & Efird Inc.
by Engr. Kh. Mashiur Rahman | Nov 9, 2013 | LAB
Principle of FTIR
Spectrophotometer is the principle of FTIR – Fourier transform infrared spectroscopy used for color management in computer. It is also known as spectrometry, colorimeter, spectrophotometry etc. Optical density of these equipments are very complex.
Category of Optical Density of Spectrophotometer:
There are different types optical density of spectrophotometer is developed by the manufactures
- Spherical Spectrophotometers
- Atomic Absorption Spectrophotometer
- Laboratory Colorimeter / Digital Colorimeters
- UV VIS NIR Spectrophotometer
- Portable Color Spectrophotometer
- UV VIS Spectrophotometer
- Visible range
- Double Beam Spectrophotometer -UV Visible
- Infrared Spectrophotometer
- Single Beam Spectrophotometer -UV Visible
- Spectrophotometers – by Wavelength Range
How a Spectrophotometer Works :
Numerical Gloss Control- Instead of using a mechanically driven gloss trap, the Spectrophotometer should equipped with a patented numerical gloss (SCI/SCE) control system.
(more…)