Water Based Ink For Plastic
Water based ink for plastic is a low-VOC printing ink formulated to bond with polymer surfaces using water as the primary carrier fluid instead of hydrocarbon solvents.
The ink forms a continuous resin-pigment film on plastic substrates after water evaporation and resin coalescence.
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Product Introduction
Main Resin and Pigment Components
Acrylic Resin
Water-based acrylic resin forms the primary binder phase.
Typical functions:
Attach pigment to plastic surfaces
Form continuous coating film
Control hardness and gloss
Common acrylic systems include:
Styrene acrylic
Pure acrylic
Self-crosslinking acrylic emulsions
Solid content typically ranges from:
35–50%
Polyurethane Dispersion
Polyurethane dispersions improve:
Flexibility
Abrasion resistance
Chemical resistance
Adhesion on flexible film
These systems are commonly used for:
Flexible packaging film
Plastic labels
Membrane switch overlays
Pigment System
Pigments provide color, opacity, and UV stability.
Common pigments include:
| Pigment Type | Typical Application |
|---|---|
| Titanium dioxide | White opacity layer |
| Carbon black | Industrial coding |
| Organic pigments | Packaging graphics |
| Inorganic pigments | Outdoor labels |
| Parameter | Details |
|---|---|
| Curing Wavelength | 365-395nm (UV-LED compatible) |
| Curing Time | 2-5 seconds (60-100mJ/cm²) |
| Wash Resistance | ≥50 cycles (ISO 105-C10, 60℃) |
| Substrates | Cotton, polyester, nylon, blended cloth labels |
| Viscosity | 150-300 cP (adjustable for flexo presses) |
| Color Range | CMYK + custom Pantone spot colors |
| Shelf Life | 12 months (sealed,15-25℃) |
Industrial Applications
Flexible Packaging Printing
Water based plastic ink is used in flexographic and gravure printing lines for flexible packaging production.
Typical substrates include:
BOPP film
PET film
PE laminated film
CPP film
The ink forms graphic and information layers on:
Food pouches
Detergent packaging
Agricultural chemical bags
Frozen food packaging
FAQ:
Why does water based ink require surface treatment before printing on plastic?
Many plastic materials such as PP and PE have low surface energy, typically below 33 dyn/cm.
Low surface energy prevents the ink from wetting and attaching to the substrate surface.
Corona or flame treatment oxidizes the plastic surface and increases surface energy to approximately:
38–44 dyn/cm
This improves resin anchoring and coating uniformity during printing.
Why does water based ink peel off plastic containers after printing?
Common causes include:
Inadequate surface treatment
Oil or mold release contamination
Insufficient drying temperature
Excessive ink film thickness
Poor resin compatibility with substrate material
Adhesion failure often appears around curved edges or high-stress areas during container handling.
What causes blocking during plastic film printing?
Blocking occurs when printed film layers stick together during rewinding or stacking.
Typical causes:
| Cause | Result |
|---|---|
| Incomplete drying | Residual moisture remains |
| Excessive coating thickness | Slow water evaporation |
| High storage temperature | Film softening |
| High winding pressure | Surface transfer |
Blocking is common in flexible packaging lines operating at high production speed.
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