823A 828B Flexible Packaging Adhesive Used In The Packaging Of Food, Medicine, Daily Use Chemical, Industrial Packages

Weeton 823A/828B is a two-component solvent-free polyurethane adhesive for various film/film, film/metalized film and film /foil laminates, widely used in the packaging of food, medicine, daily use chemical, industrial packages. It has low viscosity, good wettability, long pot life, high peeling strength and high laminating speed (450m/min).

The typical applicable structure is as follows +:

• OPP (PET) / met. CPP
• OPP (PET) / CPP (PE)
• PA // PE (CPP)
• AL / PE

+: Film should get appropriate surface tension by corona treatment

Properties

* Mass ratio changes from 100: 50 to 100: 60 depending on the humidity and films.

Directions for use

• Mix Ratio: The standard mass ratio of 823A:828B is 100:50. Adjust the ratio according to product properties, printing inks, raw materials, and production conditions.
• Coating: 823A/828B 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 - 2.5g/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 823A/828B at 40°C is 30-50min with excellent operability
• 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.

Typical Use Parameters

Storage barrel: 823 A: 40°C 828 B: 35-45 °C
Transport hose: 40 °C
Metering roller: 40 °C
Coating roller: 45-50 °C
Pot life: over 30 mins(mixed)
Application weight: 1.2 - 2.5g/m²
Coating temperature: 40-55°C
Coating speed: 100-450m/min
Curing time: 35-45°C/24–48h (70%RH)

FDA Compliance

823A/828B is in compliance with FDA175.105 and GB9685–2008

Storage & Transport
Storage: 823A/828B have 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

823 A: 20kg/bucket; 828 B: 20kg/bucket

Notes

When using HT 823A and HT 828B 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 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 and our safety data sheet and contact Huitian for analytical support.

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