720H/700 Solvent-based Laminating Adhesive Flexible Packaging Adhesive Suitable

Product Specification

 TDS Weeton 720H 700 EN.pdf

Weeton 720H/700 is a two-component polyurethane adhesive for various film/film and film/foil laminates. The product has high initial adhesion, high peeling strength, good transparency, and can effectively prevent the tunnel phenomenon.

Properties

Directions for use

• 1. 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 affecting the strength; Do not use aromatic or alcoholic solvents.

  2. Mixing method: After having added the right quantity of solvent to 720H and having achieved the required solid content, 700 has to be stirred into the 720H/solvent mixture.

  3. 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: The ready-for-use adhesive in closed containers has a working time of about 8 hours. If the laminating machine doesn’t use up adhesive, the retention time shouldn’t be more than 4 hours. Otherwise, the adhesive should be abandoned, or it may result in unstable laminated film.

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

5. Coating: 720H/700 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.

7. Pressure adjustment: Appropriate increase in laminating temperature and pressure can improve the bonding effect

and surface finish of the laminates.

8. 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 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, processing technology.

9. Curing: Stored in a curing chamber (45-55°C), the laminates will be ready for cutting in 24h. The curing time should be extended if the laminates are used for bagging.

10. Film properties: The completely cured 720H/700 polyurethane film is transparent, odorless, elastic and aging-resistant.

Product certification

720H/700 are 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: 720 has a storage life of 12 months when stored at a cool and dry place in unopened containers. Once opened, containers of 728A/728B 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

720H:20KG/bucket

700:3.5KG/bucket

Notes

When using 720 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 as well as our safety data sheet and contact Huitian for analytical support.

As the adhesive contains polyisocyanates any contact with 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.

 
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