FULLY AUTOMATIC FLAT – BED SCREEN PRINTING MACHINE

 

In order to increase the speed of flat – screen printing, it was necessary to devise a method of printing all the colours simultaneously. Unfortunately, flat screens are not suitable coloration units for a truly continuous process, and in all the successful machines for fully automatic flat – screen printing the colour is applied through the screen while the fabric is stationary.

            The machine consists of

ð  Printing table (flat bed)

ð  An endless conveyer belt to bring the fabric on to the table under the screen periodically

ð  A number of screens

ð  A special mechanism for lowering the screen on the required parts of the fabric squeegees driven by motor

ð  A special conveyer under the table to collect extra paste

ð  An arrangement for gumming the fabric to the conveyer belt and a drier.

During printing, the fabric is brought on to the printing table through a feeding arrangement and gummed to the conveyer belt on the table. For gumming, a two shaft peddler is used in which the bottom shaft rotates in a gum box and transmits the gum on to the top shaft which transfers it to the conveyer belt. The conveyer brings the fabric periodically under the screens and stops while the screens are lowered on the required parts of the fabric by a special mechanism. The squeegee makes one or more strokes over the screen after which the screens are lifted again.

            Printing paste prepared in tanks is brought through flexible hoses and poured on the screen. It is then distributed throughout the full length of the screen. The squeegee is pressed to the screen by dynamometers placed at the both ends of the squeegee holders. One or more strokes of the squeegee ensure simultaneous printing of the patterns by the common action of all screens each of which applies the printing paste as required by the colour in the design. Extra paste is collected by a special conveyer running under the table. After printing, the fabric is dried by passing through a hot – air chamber. The conveyer returns to its original position where it is washed and dried and a new fabric is gummed on it.

            Greater production of printed cloth can be achieved by this machine as compared to ordinary hand screen printing and exact registration of prints with different repeats is possible. Printing can also be carried out with as many as 6 squeegee strokes. Since the process is mechanised, it is not laborious and yet has all the advantages of screen printing.

 

ð  FEEDING:-  Feeding device is consist of two guider (roller or plate) manufactured by metal or rubber coated, and  tension roller to maintain the fabric flow in creaseless form.

ð  GUMMING:- Gumming device consist two rubber coated roller, one is dipped in gumming tank to apply gum to another roller which is attached to the blanket.

ð  PRINTING TABLE / SYSTEM:- The cast iron bed or wooden bed duly machine cut rest on heavy duty cast iron structure to ensure vibration free operation cloth feeding is tensionless with expander or cloth guiding arrangement permanent gumming arrangement can be given with electrical heater and thermostatic temperature controller rubber printing blanket travels on bed very accurately, main drive through mechanical sector run by reduction gear box and A.C. electric motor with correction device by hydraulic cylinder, screen adjustment is very handy to set design and the setting systems is located conveniently on the machine.

ð  BLANKET WASHING UNIT:- two nos of brush rolls are driven by A.C. electric Motor and they are housed in a S.S. TANK .Special Design squeeze also attached.

ð  DRYER:- The high capacity float dryer with suitable jets, radiators, fan assembly and insulating penal gives quick and even drying for all types of print. The dryer capacity can be increased by adding extra dryer modules.

ð  ELECTRICALCONTROL PANEL:- Internally fully wired electrical penal is made from best quality contactors, relays, switches for controlling M/C Operations.

ð  INVERTOR / SERVO CONTROL PANEL:- Invertors / servo control panel that is known for its high performance and stable nature. Made from superior quality components, these panels consume less power and provide higher outputs. These compact designed highly efficient control panels which use for our fully automatic flat bed screen printing machine for quality performance.

ð  FULLEY AUTOMATIC PRINTING HEAD:- An extensive range of automatic printing head on fully automatic flat bed screen printing machine that is an auto AC inverter drive system for flat bed printing machine.

Reference:- (Book)

1.      Handbook of Textile Processing Machinery by R.S. Bhagwat

2.      Textile Printing by LWC Miles

3.      Technology of Printing by Dr. V.A. Shenai

4.      Technology of Printing by R.S. Prayag