General Purpose Series

As a kind of common adhesive, this product is two-component solvent-based polyurethane adhesive. Our product possesses many remarkable properties, such as high transparency, excellent elasticity, high bonding strength, good frost resistance, no peculiar smell, as well as good resistance to aging, good machinability and wettabilty. Thus, it is often applied to bond different substrates including PET, BOPP, CPP, VMCPP, VMPET, NY and aluminum foil.
Our product fits well for both high-speed and low-speed printing machines. Due to its proper viscosity, it still works when the solid content varies within a comparatively large scope.

Applicable Substrates
Our dry lamination adhesive fits for BOPP/CPP (PE, VMCPP), PET/VMPET/CPP (PE), PET/PE, NY/PE, aluminum foil and other substrates that have common requirements for boiling performance.

Glue Amount
For dry lamination, the glue amount is usually controlled within 2-3.5g/m2.

Note: The symbol "*" means the amount of curing agent is adjustable within this range depending on specific application and ambient humidity.

Calculation Formula for Dry Glue
Cw=KhN, where
Cw is the dry glue amount (g/m2)
K is the correction factor whose typical values are within 0.15-0.25
h is the cell depth of anilox roll (μm)
N is the solid content of adhesive (%)

Calculation Formula for Diluent
Wx=(Wz×Nz Wg×Ng)/N-(Wz Wg), where
Wx is the weight of diluent (kg)
Wz is the weight of main agent (kg)
Nz is the solid content of main agent (%)
Wg is the weight of curing agent (kg)
Ng is the solid content of curing agent (%)
N is the working concentration after proportioning (%)

Cautions
1. For this dry lamination adhesive, the corresponding substrate must be clean, dry, dust-free and oil-less, and its surface tension should be higher than 38dyn/cm2. For PET and NY substrates, the surface tension values need to be over 50dyn/cm2 and 52dyn/cm2, respectively.

2. The applied solvent, namely ethyl acetate, is required to have a water content of less than 0.05%, while alcohol, acid, amine and other materials that contain active hydrogen should be avoided. Otherwise, incomplete drying may take place.

3. On condition that the substrate has too much slip agent (erucylamide), the bonding strength turns out to be worse. Given this, the application of such substrates must be controlled rigorously.

4. If the dry lamination adhesive is planned to bond PET or PA, please place the printed substrate for 24 hours before lamination to get better results.

5. When it comes to lamination process, the ambient RH is recommended to be around 65%. If actual RH is higher than this value, more curing agent is needed.

6. The glue should be used within 8 hours after preparation. The remaining glue needs to be kept in a closed container, and the container requires cold preservation. Before using the remaining glue, please thaw it in sealed condition, and mix it with newly prepared glue. Moreover, it is not allowed to use whitish or cross-linked glue.

Lamination Process
The drying tunnel temperature shall be increased to 60℃, 70℃ and 80℃ gradually, and this temperature, along with the air flow, plays a very important role in the evaporation process of solvent. The lamination temperature is 55-85℃, and the pressure of press roll is within 0.3-0.5MPa. In addition, appropriate drum heater’s temperature and pressure help to improve the transparency and peel strength of final product.

The curing process is implemented at 40-50℃ for 12-48 hours.

Product Package and Storage
The main agent of our dry lamination adhesive is stored in a barrel, and one barrel contains 20kg of such product. On the other hand, 4kg of the curing agent is packed in one barrel, and this is customizable.

This laminate binding chemical is a kind of flammable material. Hence, it shall be stored in a cool, shady, fireproof, moisture-proof, well ventilated place.

Notes
1. The technical suggestions are based on our experience and expertise. They are true and reliable, but not guarantees because the working condition and process flow are not controllable to us.
2. Before commercial production, please check out whether our dry lamination adhesive fits for your equipment and the end product.