Dry & Wet Lamination Machine

With wet laminations, the adhesive is applied to one substrate, usually by roller coating or air knife. The coated substrate is then nipped with another substrate, and the resulting laminate may then be left to air dry or passed through a heated oven to remove solvent and build bond strength.

The types of adhesive used for wet lamination are : waterborne natural products, such as starch and dextrin or waterborne synthetic latex products, such as polyvinyl acetate, acrylic, etc. 100% reactive liquids, such as polyurethanes or polyesters.Wet lamination via waterborne or solvent based adhesives is confined to applications where at least one substrate is porous (e.g., paper, cardboard, textiles) to facilitate drying. Once cured, bond strength is generally high enough to cause failure or tearing of the porous substrate. Most often, waterborne synthetic latex adhesives are utilized for wet bonding because of their high initial strength and fast drying characteristics when applied to porous substrates.

Dry Lamination

Dry laminations are those in which the liquid adhesive is first dried before lamination. The adhesive can be either applied to one substrate and dried or it can be applied as a hot melt type of film (essentially another film layer). The adhesive is then in the dry solid or slightly tacky stage when joined with the other substrate. The bonding is generally achieved during a high temperature, high pressure nip. The temperature and pressure are sufficient to cause the adhesive to flow and create an instantaneous bond when it cools and gels. Dry lamination can be applied to a broader range of products such as film-to-film and film-to-foil.

Dry laminating adhesives are generally solvent based although considerable development has taken place to reduce or replace the solvent to meet environmental regulations. This has produced several strong competitors to conventional solvent-based adhesives such as: hot melts (e.g., ethylene vinyl acetate copolymers), 100% reactive solids (e.g., two-part polyurethanes, one part moisture curing polyurethanes and UV/EB curable acrylates), high solids solvent based (e.g., silicone), and waterborne adhesives (e.g., acrylic emulsions). A significant advantage of reactive 100% solids adhesive in addition to the reduction in possible VOCs is the possible elimination of drying ovens and resulting energy cost.

SALIENT FEATURES

• Heavy duty C.I. Cast iron & Heavy fabricated structure
• Gravure type coating system
• Liner type impression pressure assembly actuated with pneumatic piston for rubber roll Doctor blade and Nip Roller
• Fully insulated imported special glass wool sheet fitted in the panel (Top side & Bottom) For controlling heat loss
• One & One Slit type counter air flow arrangement, Divided equally are placed against roller for proper web support
• Exhaust are distributed through-out the length of drying chamber & individual exhaust duct for each zone
• Digital temperature controller with indicator & PT 100 sensor for each Zone
• Inside heating for Nip Steel roller
• Heavy duty Shaft types fix Rewinder with motor

REWIND STATION

• A. C. synchronize Drive with Load cell
• Center winding system / Surface

HOT AIR GENERATOR

• Diesel / Fired Air Heater
• Thermic fluid Heater with Blower

COATING UNIT

• Independent A.C. Drive
• Pre � Heating / Exhaust

UNWIND STATION

• Tension control Brake Unit with load cell feedback (Pneumatic/Motorized)
• Moveable unwind with web guide

TECHNICAL DATA FOR COATING AND DRY LAMINATION MACHINE

• Max. Web Width : 800MM TO 1500 mm.
• Max. Unwind Dia. : 800MM T0 1000 mm.
• Max. Rewind Dia. : UP TO 1200 mm. Max.
• Type of Lamination : Dry
• Max. Machine Speed : 0 to 100/150 M.P.M

Note : The actual production speed will however depend on all lamination condition, such as type weight and quality of material adhesives and solvents atmospheric condition operator skillfulness etc.

• Ideal roller : Aluminum 85 mm O.D width inside bearing with 25 mm MS shaft.
• Tunnel Roll : 75mm with 20mm shaft
• HEATING ARRENGMENT : Heating arrangement through hot air generator 50 um to 1 lakh or 1hp blower with 12hp heater(for each chamber)
• Heat Controller : tharmoset or temp controller
• Material to be laminated : Paper Polyester, BOPP Allum, Foil LDPE & other allied material
• Frame Structure : CI plate up to 20/40 mm and Channel 4-2
• Dryer : glass wool panel from MS sheet.
• Coating system : gravure type coating with CI plate up to 20 mm and With coating cylinder mounting shaft, doctor blade, and manual rubber roll lifting,
• Laminating lead : CI plate up to 20 mm and 1 No. HCP roll with Special type of heater arrangement for laminating subtract for perfect bonding. 1 No. full width rubber roll pressure arrangement with manual lifting common drive from coating manual SYNCRONISE for acting as a laminating drive
• REWIND STATION : One Rewind 50 mm EN-8 shaft complete with core holder check nuts. Common drive through mechanical clutch 1 No. Lay-on roller for Rewind