Pigment Printing
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OBJECTIVES: Preparation of stock paste. Preparation of print paste. To print given cotton fabric with the help of Pigments. APPARATUS: Beaker Stirrer Electric Balance CHEMICALS REQUIRED:- (FOR STOCK PASTE)
PVA [3-12 %] Ammonia liquor Binder Water
20-80g/l 10-20g/l 20-40g/l 1000 ml
PROCEDURE:First of all, about 1liter of water was taken in a beaker followed by the addition of PVA 3% and a small amount of ammonia liquor. This mixture was then stirred vigorously using a high speed stirrer. The viscosity of paste was then measured with the help of viscometer. The amount of PVA was optimized to obtain a viscosity level of 7000 centipoises using spindle no. 6 of the viscometer. In the next step, binder was added and again the viscosity was measured. The increase or decrease in viscosity was noted. A small amount of PVA was again added to get the required viscosity. OBSERVATIONS:Viscosity of paste before addition of binder = 7000 centipoises Viscosity of paste after addition of binder = 6300 centipoises
PREPARATION OF PRINT PASTE FOR COTTON:APPARATUS: Beaker Stirrer Electric Balance CHEMICALS REQUIRED:- (FOR PRINT PASTE) Stock paste Pigment [4%]
40 g/l
PROCEDURE: Pigment was added in the prepared stock paste and the paste was stirred for some time to make the pigment paste. PRINTING OF COTTON FABRIC:MACHINE USED: Flat bed printing machine Stenter PROCEDURE: The fabric sample was put on flat bed machine with the screen on the fabric. Print paste was put on one side of screen and applied with the help of steel rod. Steel rod moved with the help of electromagnetic assembly and applied the paste on the fabric. The fabric was then dried at 110oC for 1 min through stenter. It was then cured at 170oC for 2 min. Testing was carried out on the fabric. RESULT:A small decrease in the viscosity of the print paste was observed by the addition of the binder, but however the rubbing fastness of the print paste was improved because cross linking of the binders was done with the fabric.
Faisal Bashir
03-NTU-009 M.Aslam Qaisrani Nouman Danish Zeeshan Haider Shahid Mahmood
03-NTU-109 03-NTU-117 03-NTU-127 03-NTU-215
NATIONAL TEXTILE UNIVERSIRY FAISALABAD
PVA [3-12 %] Ammonia liquor Binder Water
20-80g/l 10-20g/l 20-40g/l 1000 ml
PROCEDURE:First of all, about 1liter of water was taken in a beaker followed by the addition of PVA 3% and a small amount of ammonia liquor. This mixture was then stirred vigorously using a high speed stirrer. The viscosity of paste was then measured with the help of viscometer. The amount of PVA was optimized to obtain a viscosity level of 7000 centipoises using spindle no. 6 of the viscometer. In the next step, binder was added and again the viscosity was measured. The increase or decrease in viscosity was noted. A small amount of PVA was again added to get the required viscosity. OBSERVATIONS:Viscosity of paste before addition of binder = 7000 centipoises Viscosity of paste after addition of binder = 6300 centipoises
PREPARATION OF PRINT PASTE FOR COTTON:APPARATUS: Beaker Stirrer Electric Balance CHEMICALS REQUIRED:- (FOR PRINT PASTE) Stock paste Pigment [4%]
40 g/l
PROCEDURE: Pigment was added in the prepared stock paste and the paste was stirred for some time to make the pigment paste. PRINTING OF COTTON FABRIC:MACHINE USED: Flat bed printing machine Stenter PROCEDURE: The fabric sample was put on flat bed machine with the screen on the fabric. Print paste was put on one side of screen and applied with the help of steel rod. Steel rod moved with the help of electromagnetic assembly and applied the paste on the fabric. The fabric was then dried at 110oC for 1 min through stenter. It was then cured at 170oC for 2 min. Testing was carried out on the fabric. RESULT:A small decrease in the viscosity of the print paste was observed by the addition of the binder, but however the rubbing fastness of the print paste was improved because cross linking of the binders was done with the fabric.
Faisal Bashir
03-NTU-009 M.Aslam Qaisrani Nouman Danish Zeeshan Haider Shahid Mahmood
03-NTU-109 03-NTU-117 03-NTU-127 03-NTU-215
NATIONAL TEXTILE UNIVERSIRY FAISALABAD
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