829A 829B Solvent-Free Lamination low viscosity and good wettability Suitable for food packaging

TDS Weeton 829A 829B EN.pdf

829 has been developed for the laminating of transparent, aluminizing film, and metalized films as well as aluminum foils for food packaging. 829 is a product with low viscosity and good wettability.

Typical applicable structure is as follows +:

• OPP (PET) / met. CPP
• BOPP / met. CPP (met. PET) / PE
• OPP (PET) / CPP (PE)
• Nylon / LLDPE(CPP)
• PET(OPP) / PE (CPP)

+: Film should get appropriate surface tension by corona treatment

Properties

* Mass ratio changes from 100: 45 to 100: 55 depending on the humidity and films.

Directions for use

• Mix Ratio: 100 parts of 829A with 50 parts of hardener 829B.
• Coating: 829 is applied on special laminating machines with multi-roller application system.
• Coating Weight: Depending on the film or foil combination and the end use of the laminate, the adhesive weight may range from 1.2 – 2.5 g/m² dry. For printed laminates, the weight has to be adjusted accordingly.
• Dosing: The adhesive is continuously added in the gap of the application station with a two-component dosing and mixing unit. The amount of adhesive in the gap should be kept at the lowest possible level.
• Pot Life: The pot life of mixed 829 at 40°C is 30-50min with excellent operability. Please refer to fig.1
• Laminating conditions: Precise web tension control together with a suitable winding program avoids delamination as well as telescoping and curling effects.
• Cleaning: In case of a machine stop (for more than 30 minutes) the coating unit has to be cleaned with solvents/plasticizer-mixture (observe safety precautions) and the 2-component dosing unit has to be washed. The same cleaning procedure has to follow at the end of the run.
• Curing: The laminates may be rewound and slit after 1-2 days at 35-45°C. Manufacture of triplex laminates is possible 12 hours after duplex production. Complete curing will be achieved after 24 hours at 25-45°C or 3-5 days at room temperature.

Pot life

Figure1: The viscosity of 829A/829B vs. time at 50℃

Typical Use Parameters

Storage barrel: 829 A: 50°C 829 B: 50 °C

Transport hose: 50 °C

Metering roller: 50 °C

Coating roller: 50 °C

Pot life: over 30 mins(mixed)

Application weight: 1.2 - 2.5g/m²

Coating temperature: 53°C

Coating speed: -450m/min

Curing time: 40°C/24–48h (50-90%RH)

FDA Compliance

829 is in compositional compliance with FDA 175.105 and GB 9685 –200, The fully cured adhesive complies with testing conditions of BfR XXVIII. and the specific migration limits of plastic directive 2002/72/EC and amendment 2004/19/EC.

Storage & Transport

Storage: 829 has a storage life of 9 months a room temperature when stored in the original unopened containers. Opened containers have to be closed immediately and the material should be consumed within a short period.

Transport: Details can be obtained from the corresponding safety data sheets.

Packaging specifications

829 A: 20 kg /barrel; 829 B: 20 kg /barrel

Notes

When using 829 an efficient exhaustion hood has to be fitted to the coating unit due to safety reasons. The exhaust efficiency has to be checked prior to production by gas analysis for isocyanates 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.

Other information and Disclaimer

Film additives - particularly slip additives - in packed goods, printing inks, pre-treatment and coating of films are of significant importance to the end use of the laminates and may affect the performance properties either straight away or later.

Laminates of high slip-containing films, EVA films, CPA films and white-pigmented PE films bear the risk of migration of monomeric MDI. This can cause negative influences on the filling good and may lead to antiseal effects. Therefore, practical laminating tests as well as proper checks on the laminates are necessary before going into full-scale production.

* For detailed information, please refer to Huitian's "Technical Guide to Adhesive Lamination".

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