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DMI presents – Valentine Card

February 14, 2019 Leave a 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

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Learn all about LPI vs DPI vs RESOLUTION by Bhargav Mistry

December 28, 2018 Leave a 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

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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.

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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

NOTE: Kindly rate each post and also send your comments to help us improve on contents and topics.

DMI Introduces New Courses on Art & Serigraphy Screen Printing the CAZAWAY

September 12, 2015 Leave a comment

Before I continue writing about my last workshop update on textile (t-shirt/garment) screen printing I would like you to note my next workshop dates at DMI.

29 – 30 Sept, 1 Oct 2015
Workshop on Advance Screen Printing Process on Graphics, UV Print Finishing, UV Special Effects & Packaging

27-28-29 Oct 2015
Workshop on Advance Textile Screen Printing Process, Special Effects on Garments & Heat Transfers

If you wish to participate register online soon as seats are filling up quickly…

My 1st Workshop is on graphics, commercial and value addition on packaging wherein I shall mainly focus on two aspect of screen printing. On graphics side I shall demonstrate how to print moiré free, digital like quality graphics using traditional screen printing process with various UV special effects inks and varnishes.

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And on packaging side I shall demonstrate some innovative ideas to add value into your packaging products through screen printing process.

Here’s a video presentation of some of DMI’s finest special effects screen printed in my various Workshops & Training programs.


And on last day I shall just show some highlights about serigraphy (art screen printing) which is now gaining popularity in India. Since we have just started working on this new technique in DMI hence it will take few months to master on this subject and bring it into my workshops as a regular subject on this topic.

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In serigraphy screen printing many printers ask me why cannot we print serigraphy using high quality digital printing machine ?
The first reason is that if it is digital, it’s not “serigraphy” which is the latin name of screen printing ! This technic exists and the name of those prints is “giclée” or “digigraphy”.

There are many other reasons why we cannot but I shall highlight those points in my workshop but maybe the main reason is how can we add value addition and UV special effects in serigraphy after we print digitally. I mean unless it’s a flat bed digital machine we get a chance to register the job like traditional three guides system as we use in screen printing but how will you register the job on screen printing machine to add UV special effects etc. if it’s printed on a digital machines. Many experts have also informed me that even to register jobs printed on flat bed digital machines are also difficult to match because they are also not that perfect and dimensionally stable piece to piece.

So after a long break we shall once again demonstrate how you can earn through serigraphy screen printing using various UV special effects screen printing to add value in your arts and graphics.

I have observed than in India there are few serigraphy screen printers and most of them print cut colours (solid flat colours) without halftones so most of their arts do not have gradation and halftones and that’s the reason they end up printing 12-14-16 or some times even more colours but they can never achieve gradations in their prints and arts are all made of brush strokes and strokes are mainly never flat tints unless painted specifically with flat colours.

CAZA-3

So without gradations and vignettes one cannot product exact reproduction of the original art no matter how many colour are printed. Even the separation will take hours to divide image into special colours. As matter of fact, some American screen printers made and often still make serigraphy with 50 printed colours and sometimes more. In the past, Michel Caza printed one time in the seventies 100 colours just as a “challenge” ! But to avoid this, he invented in the sixties the “halftones without dots” that allows to print full colour jobs with between 9 and 14 colours. Then, and still now, he put this technique to 7 printed colours.

FROMME-DOUGLAS-PETER--1989-74X90cm- VERDIER-FABIENNE--2005-56X76cm-

There are many companies who print serigraphy on offset machine but those prints look very much flat when compared to screen printed serigraphy and that’s because of the ink thickness achieved through screen printing. But to print special effects one has to anyway depend on screen printing. Here again, same as above, if it is “offset”, it cannot be “serigraphy”. Fine art prints are then made in what is named “photolithography” a name coming from the old technique from which offset was invented name “stone-lithography”.

My guru Michel Caza in Paris, France is one of the finest serigraphy screen printers and in his company “Graficaza” he had one division mainly focused and specialised on serigraphy (art screen printing). This company succeeded 1984 to “Atelier d’Art Michel Caza” existing since 1964. Graficaza was sold 2004, but they stop to screen print Fine art and luxury POP and disappeared 2005! Even till today he still enjoys printing fine art and serigraphy near Paris, in the screen printing workshop of his friend, the now famous artist Fabienne Verdier. In addition to several serigraphies printed for and with Fabienne, he printed this year two serigraphies of his wife Therese, painter but also Yoga and Ayurveda teacher. Some of those serigraphies were given to the winners of Gold Awards in the FESPA competition.


I was one of his lucky pupil who got my training from him in 2003 when I visited Graficaza in Paris, France to learn from the master of screen printing.

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In fact here I would like to inform you that on December 2006, DMI was inaugurated by my guru Michel Caza and he conducted two workshops one after another and his second workshop was on serigraphy screen printing.

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So with all his blessings and knowledge today after 9 years I am proud to announce regular workshop on arts and serigraphy screen printing soon at DMI…

After he conducted his first serigraphy workshop in DMI, we continued to demonstrate serigraphy screen printing but very few screen printers had shown serious interest on this process because they had to invest on machine and good screen making system which was expensive those days and without proper equipment one cannot print high quality serigraphy.

But today I don’t see that as an issue because Grafica now has more than thousand’s of screen printers using our Nano range of products and out of those many have invested in NPL which includes of UV curing machine and 5-In-1 screen making system. Those printers who have screen printing machine, proper screen making system and UV Curing Machine can very well high quality print serigraphy.

So if you have already automated your shop floor and are seeking for some diversification in business or want to learn something new than this is the right time to invest your time and energy to learn serigraphy at DMI and learn how to reproduce arts and paintings using traditional screen printing process. So with the knowledge and technique given to me by my Guru Michel Caza lets all learn serigraphy screen printing the Cazaway process at DMI…

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Because at DMI you get to Learn More | Earn More.

Now report about my last textile workshop:

DMI_Workshop_20150825-232

In this workshop for the first time and now forever we will only demonstrate how to print digital like quality through traditional screen printing process on t-shirts and garments.

CLICK HERE TO VIEW COMPLETE PHOTO GALLERY OF OUR LAST TEXTILE WORKSHOP

Now at DMI I will only teach all garment screen printers how to achieve continuous tone printing through traditional screen printing process.

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I am sorry if you want to still learn the traditional, outdated, dirty and ugly looking halftone dots (45, 55, 65 LPI etc.) and also want to understand how to avoid moire in screen printing than you will have to look for an outdated screen printing institute because at DMI the kind of process I teach there is no moire issue now anymore and in textile screen printing we never print rational halftone dots anymore. Hence in all my future workshop the topic “how to avoid moire in screen printing” has been removed forever because, I simply don’t need it…

In my three day workshop I demonstrated five variations and all with only Water Based Ink technology:

1. CMYK on white and light garments
2. Discharge & CMYK on dark garments
3. Under Base White (Khadi) & CMYK on dark garments
4. Discharge & Spot Colour Process
5. Spot colour process on under base white (Khadi)

And on the last day we also demonstrated heat transfers.

DMI_Workshop_20150825-258

All the above mentioned jobs were demonstrated using my separation technique and how one can print continuous tone printing and achieve digital like quality using traditional screen printing method.

Apart from this I also demonstrated many new techniques:


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How to mask complicated photos in less than one minute which was highly appreciated by many participant because some said to me that they sometimes spend hours to mask just one image and even then it’s not perfectly masked.

Lion_Black Lion_White

Complete workflow, file handling, PDF files, image correction and evaluation.

Color management and all about ICC profiles.

How to output correct linearised positives on image setter, inkjet printers and now for the first time we shall also demonstrate thermal image setters.

How make your artwork ready for printing and for positive output in correct manner.

How to convert low resolution file to high resolution and all about DPI, LPI & PPI

Complete workflow on screen making and screen reclaiming system.

So don’t forget to register online today:

29 – 30 Sept, 1 Oct 2015
Workshop on Advance Screen Printing Process on Graphics, UV Print Finishing, UV Special Effects & Packaging

27-28-29 Oct 2015
Workshop on Advance Textile Screen Printing Process, Special Effects on Garments & Heat Transfers

And get ready to Learn More | Earn More… at worlds most advance and finest institute DMI dedicated to the screen printing industry.

Have a pleasant weekend.

Bhargav Mistry

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