LOCTITE® LIOFOL® LA 4220 RE

• Designed for general to medium performance film laminations at line speeds in excess of 800 ft/min.
• Exhibits low misting at high line speed. This system can be used for film/film and film/foil food packaging laminations.
• The adhesives system is ideal for PE/PE structures that are designed for recycling but is suitable for a wide range of substrates.
• This adhesive also can be used for general-purpose food packaging laminations, health care, pharmaceutical and cosmetic applications.

• The selection of the adhesive system, substrates, and process conditions are critical to the success of the final structure.
• Thorough qualification on your equipment and substrates is recommended before commercial production begins.
• Note: Although not common, some high slip containing films, EVA films, PA films and white-pigmented PE films may contribute to the migration of monomeric MDI with this adhesive system.
• This can have a detrimental effect on the final sealing ability of the lamination and result in anti-seal. You should thoroughly pre-test the laminations.

• This adhesive system requires the use of Meter/Mix/Dispense (MMD) equipment that will automatically measure and mix the correct amounts of adhesive and deliver them to the laminator.
• Verification that the unit is providing the correct amounts of adhesive and coreactant is recommended prior to startup.
• If the MMD unit is capable of phasing issues (one material enters the static mixer before the other) verification that each side is being dispensed at precisely the same time is required. The adhesive is sensitive to moisture.
• Tanks or large containers such as drums will require nitrogen purging or the attachment of a desiccant dryer.

• The laminate can be further processed, rewound and slit after 3-4 days of curing at room temperature.
• To achieve complete curing, i.e., total resistance to severe environments, allow 7-10 days of storage at room temperature.
• Cure rate may depend on film combination.

• The recommended method of application for this product is with a series of rubber and steel, smooth surface transfer rollers on a specially designed solventless adhesive laminator.
• The adhesive is mixed by the MMD unit, deposited onto the first two rollers, and metered by the remaining rollers in the application station (typically 3 to 5 rollers).
• To improve the flow characteristics of the adhesive, heat the first two rollers to 90 - 104°F (35 - 40°C). The final application roller should be heated to 110 - 122°F (43 - 50°C).
• Modifications of these temperatures may be required depending on line speed, substrates, and roller size.

Coating Weight:

• The coating weight will be dependent upon the film or foil combination, the end use of the lamination, and the thickness of the printing inks.
• Typically 0.8 – 1.2 lb/ream (1.3 – 2.4 gm/m²) is suggested.

Combining Nip:

• Nip temperatures of 120 - 175°F (49 - 79°C) are generally recommended.
• Higher nip temperatures may be required depending on the line speeds, thickness, and substrates being bonded.

Initial Tack:

• There will be little or no initial tack with most solventless adhesive systems.
• Proper tension control during processing and winding will produce a good lamination.

Appearance Off-line:

• Very small bubbles (1/2 mm) between the layers of the lamination are typical off line.
• With proper winding parameters, the adhesive will flow and the bubbles will dissipate by the following day.
• To obtain maximum optical properties, a rewind temperature of 90 - 100°F (32-38°C) may be used.

Curing:

• The laminate normally can be rewound and slit after 1 day at room temperature (77°F/25°C).
• To achieve maximum chemical and thermal resistance, allow 7 to 14 days of storage at room temperature.
• Cure rate may depend on film combination. If rolls are subjected to low temperatures, a substantially longer cure time may result.

Clean Up:

• Clean up is accomplished with solvents such as ethyl acetate, methyl ethyl ketone or acetone.
• Care should be taken to ensure the solvent used would not damage the rubber rollers in the application station.
• Protective gloves should be worn and proper ventilation is recommended.

• 1 part by weight
• 0.95 parts by volume

• These products have a storage life of twelve months from date of manufacture.
• They should be held at normal warehousing temperatures and stored in the original, unopened containers.
• Containers of the adhesive or curing agent should not remain open for an extended period of time.
• Material from opened containers should be consumed within a short period. It is necessary to use all the adhesive, once the container is opened, unless there is means of purging the container with dry nitrogen.
• If exposed to below freezing temperatures, these products may solidify.
• Large containers (drums and pails) may be slow to reliquify.
• Slight warming at 104 - 122°F (40 - 50°C) will aid the process.
• Freezing and thawing have no effect on the performance of this product.

• The adhesive, as received, has chemically active Isocyanate groups that will react with water, alcohols, amines, and similar materials containing active hydrogen groups.
• Reseal containers and keep them tightly closed to maximize the storage life.
• Nitrogen purging of original containers will have a similar effect.
• Positive fresh air ventilation is necessary: otherwise use air supplied hood or chemical facemask.
• Avoid prolonged breathing of vapors and mists. In case of persistent coughing, call a physician.
• Keep adhesive away from heat, sparks and open flame. Avoid prolonged contact with skin.
• Wash hands thoroughly after using or before smoking or eating. Harmful or fatal if swallowed. If swallowed, do not induce vomiting.
• Drink one or two glasses of water and call a physician immediately.