TDS Weeton 711A 711B EN.pdf

Weeton 711A/ harder 711B two-component solvent-based polyurethane adhesive is a two-component polyurethane adhesive for various high-performance film/film laminates.

Application

In a variety of film /film laminating process, it shows excellent bonding performance, including PET/AL/PE, PET/VMPET/PE, PET/VMCPP, PET/PE, OPP/VMCPP. This product has low viscosity and short curing time (Meet the 2-3 layer structure curing, 6-8h slitting and bag making), the film has good wettability and low solvent residues, suitable for high-solid, low-viscosity and high-speed dry film laminating technology.

Properties

Directions for use

• Dilution: The suitable solvent is ethyl acetate, using water content not exceeding 300ppm, when the solvent contains active hydrogen (such as alcohols, and amines), it will react with the curing agent, resulting in a reduction of the curing agent and affect the strength; Do not use aromatic or alcoholic solvents.
• Preparation of Adhesive Mixture: After having added the right quantity of solvent to 711A and having achieved the required solid content, 711B has to be stirred into the 711A solvent mixture.
• List of Dilution: When the ethyl acetate is used for dilution to obtain an accurate solid content, the amount required should refer to the following table

Viscosity is based on the average viscosity of the Zahn Cup 3# (25°C)

4. Pot life: Unused adhesive on the laminating machine should be discarded if it has been stored for more than 8 hours, otherwise it may affect the product performance of the laminated film. Particular attention should be paid to laminating films that require high-temperature treatment and laminating films filled with irritants.

Tropical area (Temperature >28°C + humidity >60%) pot life: Ready-for-use adhesive should be used up within 2 hours.

5. Coating: 711A/711B is suitable for dry film laminating machines with smooth roller or gravure roller. Before mass production, repeated trials should be carried out to determine the fitting roller.

6. Coating weight: Depending on the film or foil combination and the end use of the laminate, the adhesive weight may range from 2.0g/m² (dry). For printed laminates the weight has to be adjusted accordingly, it should be approx.0.5-1.0g/m² higher than for unprinted films. The coating amount should be adjusted according to the raw materials and processing technology of the product.

7. Dry: The laminating machine should have good air volume, wind speed, wind pressure, and the appropriate temperature to avoid residual solvents. Temperature setting generally follows the gradient principle (55°C-65°C, 65°C-75°C, 70°C-85°C). Adjust the temperature of the oven according to the performance of the processed products, raw materials, and processing technology.

8. Pressure adjustment: An appropriate increase in laminating temperature and pressure can improve the bonding strength and surface finish of the laminates.

9. Curing: The composite film should be aged in the curing room, the curing temperature is 45-55℃, and the curing time is 2-4 days. The preliminary composite film should be matured for at least 12 hours before rewinding or manufacturing 3 layers of composite film, and bag-making should be carried out after complete curing.

10. Film properties: The completely cured 711 polyurethane film is transparent, odorless, elastic and aging-resistant.

Product certification

711A/711B is suitable for laminating food packaging materials in accordance with US FDA 175.105 and Chinese GB- 9685. After sizing, the fully cured adhesive material complies with the EU 2002/72/EC and its Supplementary Agreement 2004/19/EC on the restriction of migration of certain substances.

Storage/Transport

Storage: 711 has a storage life of 12 months when stored at a cool and dry place in unopened containers. Once opened, containers of 711A/711B should be closed tightly again and the material should be consumed within a short period.

Transport: For details please refer to the corresponding safety data sheets.

Packaging specifications

711A:20KG/bucket 711B:4KG/bucket

Notes

When using 711 an efficient exhaust hood has to be installed to the coating unit due to safety reasons. The exhaust efficiency has to be checked prior to production by gas analysis for isocyanate concentration in the air. Safety regulations with regard to the handling of isocyanates have to be followed as per the guidelines issued by the International Isocyanates Institute. Please also refer to the local safety instructions and our safety data sheet and contact Huitian for analytical support.

As the adhesive contains polyisocyanates, any contact with the skin has to be removed.

Others

Film particularly the types and content of slip agents in LDPE, MDPE and CPP films, film thickness, packed goods, printing inks, pre-treatment, and film coating are of significant importance to the end use of the laminates and may affect the performance properties either directly or indirectly. Therefore, practical laminating tests as well as checks on the laminates are necessary before going into full-scale production. The above information is from the laboratory for reference only.

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