For Certain materials like PP and HDPE, it is difficult for any ink to adhere to this material due to low surface tension of the material compared to ink. Hence these gas flame treatment systems are used online or offline on indexing table or conveyors for PP/HDPE material for pre heating them before printing to get good adhesion. It is just given some heat so that the ink molecules will bond with the PP/HDPE molecules by interlinking with each thus giving good bonding and adhesion. When given heat the surface tension of the material comes at par with the surface tension of the ink thus resulting in good bonding.

Ten variables are involved in the flame treating process:

• Composition of the air-gas mixture that produce the flame
• Dwell time between flame and material
• Distance between flame and material (air-gap)
• Power of the flame
• Type of material to be treated
• Temperature of the material to be treated
• The treatment roll surface temperature, in the case of thin plastic film flame treatment
• Kind of gas used
• Desired level of treatment
• Environment conditions

The first 4 variables are very important for the process optimization. The 6 remaining are well known in advance, and normally subject to small variations. Therefore, they are not measured, and are assumed as initial conditions.

• Long and wide conveyor
• Electronic Ignition
• Substrate positions are adjustable, can set timer for turning off the flame.
• Aluminium alloy frame
• Power Consumption 0.02KWH

• Approx 24 substrate positions
• Manual ignition
• Aluminium alloy frame
• Power Consumption 0.06KWH

• Approx 20 substrate positions
• Shorter and narrower conveyor
• Iron Body frame
• Manual flame ignition
• Power Consumption 0.04KWH

Carona systems are also used for pre treatment of PP material before it is printed to get proper adhesion. The difference is that it creates an electric discharge on the component. It is recommended over gas flame treatment as it leaves no marks and there are no chances of excess treatment and bonding is excellent.

Carona is nothing but a high-voltage electrical discharge - that appears visibly as a blue arc. The corona treatment is applied directly to the surface of virtually any material with a low surface tension. When the materials are pre-treated with corona the surface tension will increase, yielding better ink adhesion or wettability.

To understand in depth, the corona discharge field is made up of a collision of neutral molecules and electrically loaded molecules. This rapid collision causes the neutral molecules to become electrically loaded. The electrons created in this field have a charged energy that is 2 to 3 times greater than the energy needed to break the molecular bond of most materials. When the molecular bond of the substrates surface breaks into an atomic form, free radicals will react with the electrically loaded electrons in the corona field and there by change the energy (surface tension) of the substrates surface. It is important to note that only the surface of the substrate is molecularly changed.

With Kinnari's corona treating system you can raise the dyne level of PP and PE to 48 dynes or above, ensuring excellent ink adhesion to the substrate.

Infrared (IR) is a part of electromagnetic spectrum and lies just beyond red color of visible light. Infrared is invisible. However it has properties similar to light i.e. it travels at the speed of light, it can be directed or focussed and it can travel even in vacuum.

Infrared curing systems are used online on linear indexing/oval/rotary indexing systems for post treatment of products after printing for quick curing and drying so that you do not have to stack or keep the printed products for drying thus increasing productivity and saving time, labor, money. Infrared curing systems are used to dry and cure solvent based inks. Our Infrared curing system emits a particular long wave (electro magnetic spectrum) IR that is easily absorbed by printed surfaces. When IR radiation is absorbed by an object, heat is generated internally in the object as IR causes the atom of the object to vibrate, raising its temperature. (Temperature of any substance is a measure of the severity of the vibration of its atoms.) IR does not need a medium like air to heat a substance. IR wavelengths begin at 0.7 microns and wavelengths up to 10 microns have significance as far as industrial heating is concerned. These wavelengths are determined by the IR source temperature and each temperature has a characteristic spectrum with a "peak wavelength".

Advantages of Infrared curing system

• Non contact heating.
• One stage heat transfer.
• High energy efficiency.
• Faster rate of heating.
• Low thermal inertia.
• Shorter heat up and cool down time.
• Emitters that respond instantly.
• High controllability and control accuracy.
• No combustion by-product.
• Clean system.