728 2K Polyurethane Adhesive For Various Film/Film And Film/Metalized Film Laminates good flexibility & Transparency

TDS Weeton 728A 728B EN.pdf

Weeton 728 is a two-component polyurethane adhesive for various film/film and film/metalized film laminates. This product has good flexibility and good transparency, can effectively reduce the characteristics of aluminum transfer, and prevent the phenomenon of tunnel.

Properties

Directions for use

• Dilution: Suitable solvents are ethyl acetate, and Methylethylketone provided that the water content does not exceed 300 ppm. Do not use aromatic or alcoholic solvents.
• Preparation of Adhesive Mixture: After having added the right quantity of solvent to 728A and having achieved the required solids 728B has to be stirred into the 728A/solvent mixture.
• List of Dilution: When the ethyl acetate is used for dilution, to obtain an accurate solid content, it is required to refer to the following solvents.

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 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: 728 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. Application 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.0.5-1g/m² higher than for unprinted films.

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 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.

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

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 728 polyurethane film is transparent, odorless, elastic and aging-resistant.

Product certification

728A/728B 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: 728 have a storage life of 9 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

728A:20KG/bucket

728B:4KG/bucket

Notes

When using 728 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.

Huitian is your reliable partner and satisfies your need for adhesives!

Huitian New Material (stock code: 300041) is the oldest enterprise in China's adhesive & new material industry, with 46 years of development history, focusing on research and development, constantly breaking through the innovative technology of adhesive new material, taking the lead in solving the problem of necklace. With over 2,000 products spanning six disciplines, our offerings find extensive application in new energy, transportation, 5G communication, consumer electronics, aerospace, and beyond. We are committed to delivering new material one-stop solutions for high-end manufacturing industry head customers.

Huitian New Material has 6 R&D bases in Shanghai, Guangzhou, Xiangyang, Yicheng, and Changzhou, as well as industrial bases in Vietnam, providing customers with a stable supply of multi-series, high-quality products, and possessing a large-scale manufacturing capacity; the existing core R&D team consists of more than 300 people with PhDs and master's degrees, and it is the first "National Enterprise Technology Centre" in the domestic adhesive new material industry. Huitian New Material has been continuously investing in R&D for a long time, a joint development with customers, and forward-looking product reserve, constantly refining sustainable R&D capability; Huitian people's high-efficiency organizational force quickly responds to customers' needs and empowers and adds value to customers' products.

Huitian New Material was founded in 1977. Its predecessor was the earliest domestic research unit engaged in the research and development of adhesives. It is also a private high-tech enterprise transformed by a batch of research institutes in the country according to market-oriented operation. The company has a deep professional and technical accumulation and has been identified as a provincial-level post-doctoral industrial base and a national-level post-doctoral scientific research workstation.

In 2012, Huitian and the Chinese Academy of Sciences jointly set up the "High-Performance Adhesive Material Engineering Technology Center".

In 2013, Huitian Group inaugurated a new base and R&D center at its Shanghai headquarters to create a world-class adhesives R&D center.

In 2015, Huitian was awarded the National Enterprise Technology Centre jointly recognized by the National Development and Reform Commission, Ministry of Science and Technology, Ministry of Finance, General Administration of Customs, and General Administration of Taxation.

In 2017, Huitian Vietnam Yueyou Co., Ltd was established to start the road of overseas expansion.

In 2019, the Huitian Group set up overseas offices in Europe, America, and Southeast Asia to accelerate its overseas business development.

In 2022, Huitian New Material Japan Co., Ltd was founded and Huitian Vietnam Yueyou Co., Ltd opened a new office in the north part.

In 2023, Vina Evergreen Advanced Material Company Limited was established to invest in the overseas market, localization starts at the same time as internationalization.

In 2024, the Vietnamese factory of Huitien New Material starts production in BW Industrial Zone, Hai Duong, Vietnam, taking the first step toward overseas production.

Huitian New Materials has successively won the key high-tech enterprises of the National Torch Plan, China's well-known trademarks, China's Top 10 Most Valuable Investment Values, China's Adhesive Products Customer Satisfaction Brand, China's Top Ten Innovative Materials Enterprises, Patent Pilot Enterprises, and A series of precious honors such as honest taxpayer unit. The company has donated more than 20 million yuan to society and won the "Outstanding Contribution Award for Chinese Charity" twice.

Vision

Become the preferred expert for customers in adhesives and new materials

Bent on catching up with the world's advanced-level

Mission

Industry Serves the Country, Repays the Society

Values

Customer-centric, striver-oriented

Long-term hard work and continuous self-criticism

Culture

Competition, Reward, Innovation, Gratitude