TDS Weeton 856A 856B EN.pdf
Weeton 856A/856B is a two-component solvent-free flexible packaging laminating adhesive widely used in plastic/plastic, plastic/aluminum, and other material structures of the composite, high-strength pharmaceutical packaging foil, the aluminum-plated structure of the inner layer, suitable for plastic/plastic structure of the boiling and steaming. It has the characteristics of high peel strength, excellent surface wettability, excellent heat resistance, long pot life, and no smell.
858A/ hardener 856B two-component solvent-free adhesive has medium viscosity and excellent wetting performance, which meets the requirements of high-speed laminating (0 - 300 m / min). 858A/ hardener 856B does not affect the openness of the inner layer of the composite film, the adhesive layer is transparent after curing, odorless, elastic, and resistant to aging.
The typical applicable structure is as follows +:
- PET/Milky white PE, PET/PE
- PET/CPP
- AI/PE (Ordinary medium)
- PA/PE, PA/PCPP
+: Film should get appropriate surface tension by corona treatment
*According to the environmental humidity and the film's composite structure, the ratio can be adjusted between 100: 50-70, high temperature and high humidity are appropriate to reduce the 856B content, and the CPP structure is suitable to increase the curing temperature and the amount of glue; solvent-free composite workshop with air conditioning in the summer, leave the workshop as soon as possible into the drying room, to avoid excessive humidity in the workshop, alternating hot and cold moisture cooling on the surface of the film, resulting in excessive moisture.
Properties
| Product Name |
856A 856B |
| Component |
Isocyanate component Hydroxyl component |
| Mixing Ratio |
100:60* (mass ratio) |
| Solids Content |
100% 100% |
| Viscosity |
700-1,800mPa.s
(Brookfield LVT,25°C)
|
700-1,500mPa.s
(Brookfield LVT, 25°C)
|
| Color |
Colorless to light yellow transparent Colorless to light yellow transparent |
| Density |
1.15±0.05 g/cm3 1.15±0.05 g/cm3 |
Directions for use
- Ratio: The standard mass ratio 858A/hardener 856B = 100: 60 can be fine-tuned according to the properties of the product, the ink, the packaging material, and the operating conditions.
- Mix method: Mix by automatic mixing machine, mix evenly before use.
- Coating system temperature setting: Recommended mixing and coating operating temperature parameters are shown in the "Typical Use Parameters column" and can be adjusted according to the actual conditions of use.
- Coating: Suitable for specialized laminating equipment with multi-roll coating systems.
- Coating weight: Depending on the combination of plastic film or aluminum foil and the end use of the laminated film, the coating amount of the adhesive can range from 1.2 to 2.5 g / m2. Usually, for printed film lamination, the coating amount needs to be increased appropriately when the structure is AI/CPP.
- Adding: Use a two-component dosing and mixing unit to add the adhesive continuously to the adhesive tank of the solvent-free laminator. The adhesive in the tank should be kept as fresh as possible to avoid abnormal viscosity affecting the coating result.
- Pot life: 858A/Hardener 856B component has a pot lifetime of about 40-50 minutes at 45°C after mixing and shows reliable workability. See Figure 1 below.
- Laminating conditions: Precise tension control and proper winding procedures prevent delamination, roll head size difference, and film curl.
- Curing: Cure at 38 - 45℃ for 18-24h for rewinding and slitting. Aluminum foil composite products usually need to be cured at 45℃~50℃ for 36~48 hours, winter AI/CPP structures need to increase the curing time to 48~60 hours.
- Cleaning: When the machine is shut down for more than 40 minutes, the metering roll position adhesive can no longer be used and the coating unit needs to be cleaned with a solvent/plasticizer mixture (refer to Safety Precautions). The two-roller coating unit also needs to be cleaned and the same cleaning procedure should be carried out at the end of the start-up period.
Pot life
Figure1: 856A/ hardener 856B Standard proportioning 100:60 pot life (45℃)
Typical Use Parameters
Glue container: 856ASummer 36-38℃ Winter 40-42℃
Hardener856B Summer 34-37℃ Winter 40-42℃
Rubber hose: 856ASummer 38℃ Winter 40℃
Hardener856B Summer 35℃ Winter 40℃
Metering roller: 35-38℃
Coating roller: 35-38℃
Pot life: about 40-50mins (after mixing)
Coating weight: 1.2-3.5 g/m2
Laminating temperature: 35-40℃
Laminating machine speed: 0-300 m/min
Curing time: 35-38℃/12-36h (60-70%RH)
FDA Compliance
856A/856B 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: 856A/856B are recommended to be stored in a cool and dry place, away from sunlight and high temperatures. When unopened it should be stored in the original closed container. The main agent 856A is valid for 12 months and the hardener 856B for 12 months. Open the storage container, after use, it should be recovered and sealed, and the rest of the product should be used up within a short period of time.
Transport: Please refer to the relevant MSDS for details.
Packaging specifications
856A:20 KG/bucket, Special requirement 200KG/Drum; 856B:20 KG/bucket Special requirement 200KG/Drum.
Notes
When using 858A/ hardener856B an efficient exhaust hood should 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.
Special Note:858B In cold winter, there will be small lumps is a normal phenomenon, before use in the drying room preheating can be melted or in the dosing tank can be melted, which does not affect the use.
Other information and Disclaimer
Film additives (especially slipping agents) for packaged goods, printing inks, and pretreatment of films and coatings are critical to the end use of the laminated product and can directly or indirectly affect performance. In order to obtain good lamination results, practical lamination trials and proper testing of the laminates are necessary before large-scale production.
* For detailed information, please refer to Huitian's "Technical Guide to Adhesive Lamination".
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