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Spot Process Colour Separation for t-shirt screen printing

AVOID CMYK SCREEN PRINTING ON T-SHIRT & GARMENT.

Use the latest spot process colour separation technique to achieve high-quality photo images on t-shirts and garment.

Download FREE high-resolution sample files to learn. You can also output positives using the sample files to see the difference in print quality.

Part – 1

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टी-शर्ट और परिधान पर सीएमवाइके स्क्रीनिंग का उपयोग न करें।

स्पॉट प्रक्रिया रंग पृथक्करण तकनीक का उपयोग करके टी-शर्ट पर स्क्रीन प्रिंटिंग प्रक्रिया द्वारा फोटो गुणवत्ता छवि को कैसे प्राप्त करें.

सीखने के लिए मुफ्त उच्च-रिज़ॉल्यूशन नमूना फ़ाइलें डाउनलोड करें। आप प्रिंट की गुणवत्ता में अंतर देखने के लिए नमूना फ़ाइलों का उपयोग करके सकारात्मक भी आउटपुट कर सकते हैं।

भाग – पहला

DOWNLOAD FILE LINK

https://www.dropbox.com/s/t2mfznvtnmzk2k4/Miami_Glow_CMYK.psd?dl=0

https://www.dropbox.com/s/pinhqiyrojmrft5/Miami_Glow_Separation.psd?dl=0

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DMI presents – Valentine Card

February 14, 2019 1 comment

On this valentine day, I would like to present DMI’s Valentine Card to all our students, workshop participants, customers and everyone who loves SCREEN PRINTING.

This card is completely screen printed with all UV INKS & VARNISH on foil laminated paper & Mirror.

FRONT PAGE
1st – Matt Black
2nd – Refractive Varnish (Micro Embossing Effect)
3rd – Metallic Red
4th – ROSE FRAGRANCE INK to get the smell of ROSE
INSIDE PAGE (LEFT)
5th – Metallic GOLD on Heart Shape
6th – Multi colour glitter on Heart Shape
7th – Wrinkle Varnish on the remaining area
INSIDE PAGE (RIGHT)
8th – Bubble Varnish
9th – Matt Varnish on Mirror
BACK SIDE
10th – Drip-off Effect by screen printing
11th – Metallic Orange
12th White Ink

Learn all about LPI vs DPI vs RESOLUTION by Bhargav Mistry

December 28, 2018 1 comment

Learn all about LPI vs DPI vs RESOLUTION by Bhargav Mistry

A video tutorial in HINDI Language

For more information log on to:

https://graficaindia.com

https://www.facebook.com/graficaflextronica

https://www.facebook.com/dmiinstitute

https://www.youtube.com/GraficaFlextronica_Videos

Happy screen printing

Bhargav Mistry

Grafica’s NEW – Hybrid Dryer (Gas + Electric)

October 2, 2018 2 comments
Grafica_Hybrid_Dryer

Grafica’s Hybrid Dryer – Gas + Electric

Grafica’s hybrid dryer is meant for drying jobs printed with wide range of inks on a variety of substrates.

Single touch screen display automatically diagnosis for safety & faults during operation supported by artificial intelligence system with error message display on screen with alarm

Grafica_Hybrid_Dryer_TouchScreen

Grafica’s Hybrid Dryer – Gas + Electric (Touch Screen Panel)

It’s insulated with high density rock wool and double fabrication throughout to retain maximum heat inside the chamber while keeping the outside relatively cool

Exceptionally imposing airflow management system is facilitated by a very powerful low noise blower that discharges air circulating uniformly around the entire heating chamber’s inner hood through strategically placed holes. Incoming airflow passes through heating system to the printed surface. Because air creates a vacuum-like behaviour at the side of the conveyor and re-circulated to the top again.

Powerful air re-circulation with air purification system effectively scrubs solvents/ water away from the ink surface, thereby allowing faster drying times while lowering temperature requirements for a superior processing.

Grafica_Hybrid_Dryer_TopView

Grafica’s Hybrid Dryer – Gas + Electric (Top View)

Heated air is recycled, which in effect reduces power consumption considerably, the heating bank consisting of extremely effective heaters are not continuously engaged and drawing power in order to maintain temperature setting. Air circulation system maintains equal heat distribution all over the chambers. External variable airflow damper is provided to adjust exhausted air, according to solvent saturation during production, so that the drying system can always operate in its most efficient manner thus reduces power consumption.

To further improve efficient and energy conservation, a tool- free adjustable entry and exit stainless steel shields are provided to further prevent heat from spilling out to the production area. Exhaust fan below the electrical box is purposely intended to keep the electrical components cool and fully operational.

Single touch screen display with high quality thermocouple sensor, keeps precise temperature inside the chamber to ensure perfect control of drying.

The dryer’s inner chamber has a separate module from the heater to prevent escaping heat from spilling out into the production area.

High quality PTFE coated antistatic conveyor belt comes as standard, which is firmly driven by an AC geared motor with a frequency inverter for precise speed control—a handy feature at times when the belt is fully.

The rubberised conveyor drive roller is specifically cambered for superior belt tracking irrespective if the workload is off centred drying on the conveyor.

The dryer is completely portable in design for ease of mobility or it can be anchored to the floor with its own foundation bolts for a more permanent location.

Finally, to keep the dryer in optimum operation condition, a fine graded filter collects fine fibers and lint which prevents them from detrimentally sticking to the heaters themselves.

Grafica_Hybrid_Dryer_SideView

Grafica’s Hybrid Dryer – Gas + Electric (Side View)

Standard Features:

  • With removable filter to collect fine fibres, lints & dust particles
  • Compact design
  • Single touch screen display, simple to operate
  • High quality Antistatic PTFE coated conveyor belt
  • Powerful blower to recycle heated air circulation with exhaust system to remove solvent laden air from the chamber
  • Extremely effective heaters with special coating to deliver maximum efficiency and to maintain consistent temperature (max. 200 C / 390 F)
  • Equal heat distribution all over the chamber
  • Variable external airflow damper is provided to adjust the exhausted air, according to solvent saturation during production.
  • High density rock wool insulated heating chamber with double fabrication to retain maximum heat inside the chamber while keeping the outside body relatively cool
  • High quality thermocouple sensor, keeps precise temperature inside the chamber to ensure perfect control of drying
  • AC geared motor with a frequency inverter to set precise conveyor belt speed (Bidirectional)
  • Real Time conveyor belt speed control
  • Rubberised drive roller specifically cambered for superior belt tracking
  • Fine-graded air purification filter to collect fine fibres and lint which prevents them from detrimentally sticking to the heaters themselves
  • Sensor to detect filter choking with error message on screen and alarm
  • Tool-free adjustable entry and exit stainless steel shields provided to prevent heat spilling out to the production area
  • Castor wheel for ease of mobility
  • Exhaust fan inside the electrical panel to keep the components cool
  • In the event of electrical failure a special mechanism is designed to remove material from the chamber
  • The system automatically diagnosis for safety & faults during operation supported by artificial intelligence system with error message display on screen and sound an alarm
  • Safety button placed on both ends for emergency stop
  • High quality gas burner with solenoid and gas volume regulator with all safety
  • Single & double belt models available on request

Click on the link given below to download catalogue & technical specifications:

Grafica’s Hybrid Electric-Gas Dryer

DMI is truly an International Screen Printing Institute!

July 23, 2017 2 comments

Hi Friends,

My recent houseful workshop had 19 overseas participants (South Africa – 10, Egypt – 5, Japan – 1, Nepal – 2 and Sri Lanka – 1). In all there were 59 participants.

DMI is now truly an international screen printing institute!

DMI_Textile_Workshop_20170719_108

There is a saying that sometimes photo speaks more than words. So let me share with you photos of my recent textile workshop.

CLICK HERE AND ENJOY THE PHOTO GALLERY

Have a nice & lazy Sunday…

Bhargav Mistry

Technical Tips by Bhargav Mistry, DMI – #3

In my previous blog post I had mentioned about Humidity control and I would like to further elaborate on this subject.

Controlling Humidity is very important and essential in screen making department. Few companies do have Air-Conditioned in their screen making department but that only will not help. Split/ceiling mount or wall mount units are all comfort AC’s and do not have humidity control system.

If you want to achieve high quality screens and repetition accuracy then controlling Temperature and Humidity becomes very crucial.

In DMI many times we keep screens till max. 15/20 day unexposed. Obviously under control environment and in total dark condition to prevent from light and to avoid hardening of screens.

To achieve longer shelf life from pre-coated screens do not allow screens to get expose to any kind of light including yellow light of your screen making room.

Once the coating is over and the screen is removed from the screen dryer. Keep those screens inside cupboards to avoid lights.

The main reason we could keep our pre-coated screens in perfect condition till 15/20 days is due to controlled temperature and humidity.

Alway try to keep humidity as low as possible at DMI we maintain between 50% to 55% RH and temperature 23℃ to 24℃
Humidifier_WhiteWestingHouseIf you are thinking about investment and running cost. Believe me its negligible compare to quality.

Currently in DMI we use centralised air-condition plant with inbuilt humidity control system.

But previously in DMI we were using White-Westinghouse Model WDE550. This machine consumes approx. 20 units in 24 hours which costs us max. ₹140/- per day which is very negligible.

It’s worth spending because the quality of screen will improves drastically. Plus you will always get repetition accuracy.

Especially when you use Inkjet films it will help a lot because I have observed people complaining of ink transferring on emulsion after exposing and there after the films can no longer be used.

The main reason for this is humidity or improper time given for emulsion to dry. The use of Screen Dryer is very much essential to achieve proper drying of liquid emulsions.

Investing on a humidity control system is very much essential in screen making department.

These kind of humidifier are available online on Amazon and Flipkart. The one which we use WDE550 cover approx. 550 sq. ft. easily (5500 Cubic Ft.).

“It’s vital that the amount of remaining moisture in the emulsion coat in the screen – when totally dry after coating (before exposing ), and also when dry after development (before printing) – remains under 4%. If it must resist to printing, especially in the part of India and Asia or in any other country when the humidity of external or internal air is above 70%. There are tools available in market which can measure internal emulsion humidity.” Says Michel Caza.

Below I have mentioned few important points if your screen making department has proper yellow lights, no windows to prevent outside lights, plus controlled temperature and humidity.

  1. Repetition accuracy
  2. Image Sharpness
  3. Reduce stencil breakdown during printing
  4. Increases quantity of prints
  5. Avoid inkjet films black ink transfer on emulsion after exposing
  6. Reuse inkjet films
  7. Reduces tackiness
  8. Increases pre-coated screens storage life
  9. Avoid pinhole problems
  10. Reuse screens after short print runs

So if you want to improve your screens, improve your screen making department first.

In my next post I shall highlight the importance each department and process.

Till then good bye.

Bhargav Mistry

Technical Tips on Screen Printing by Michel Caza – #1

March 8, 2017 4 comments

Bhargav-MichelCazaToday I will be posting my first Technical Tips. As my I have written dozens of technical articles on my blog but this new concept is designed to provide short and quick technical informations on screen printing technology.

Since it’s my first post, so I requested my GURU Michel Caza to kick start by posting one short technical tips.

Yesterday evening I requested him to send me few technical articles & tips so that I shall keep you posting one by one.

He was quite helpful to send me one quick article on Screen Making but there are many more to come from us and also from many other technocrats of this industry.

This is just a beginning, you will see many in-depth articles, tips, videos, visual to learn every day with many new innovative ideas.


Q – The small dots and fine lines printed disappear on the screen after stencilling?

Dots and lines too fine on the film
Respect the indications about the maximum possible fineness to reproduce

Dots and lines not black enough on the film
This can happen with films made by inkjet, not dark enough.
The sharpness, resolution, edge definition of the film must be perfect.

Colour of the screen mesh
Always use yellow mesh, avoid white mesh, to prevent light dispersion in the thread

Too coarse fabric or/and too large thread diameter
This prevent to print fine lines or dot : use S or T, thread diameter of 27 to 31 microns
in 120 to 165 thread/cm, plain wave (PW) if possible

Improper emulsion sensibility for fine lines definition and resolution
Choose a good emulsion, diazo (SBQ) or better, diazo polymer (wide latitude when exposing) with high amount of solid content.

Too many emulsion coats
As it must be exposed more, this causes the closing of the fines lines and dots.

Over exposure of the screen
Even with a correct coating of emulsion (1 coat, 1 + 1, or 2 + 1 maximum), respect the indication given by the Exposure Calculator.

Handling of screen under Improper light.
When the emulsion is dry, before and after exposure and beginning of developing with water, it is sensible to the light and can then be hardened, partially or totally. Then use yellow light in stencil room. When wetted on both sides of the screen , the white light can be used.

Poor contact in the exposing unit
To prevent any dispersion of the UV light during the exposure the contact between film and screen must be perfect. Check your vacuum pump or the rubber carpet quality which must be clean and without holes. Use a thread to the screen frame to permit a better drainage of the air.

Use of “UV tubes” light
I do not advise this because the UV light is not punctual enough and the dispersed light is not able to stencil properly line and dots under 100 microns. For fine lines, use a metal halide lamp.

No “light integrator”
Take care of exposure “time” which can drastically change during the day with the variations of supplied electricity. Use a light integrator which automatically measure and supplies the exact “amount of light” needed

Poor development of the screen.
If some emulsion remains in the finest lines or dot that should be totally open, those will be closed and of course impossible to print.

All the best from;

Michel Caza

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