A simple breakdown of why packaging printing and garment printing require totally different equipment, inks, and expertise.

When people hear the word "silkscreen printing," it’s easy to assume that printing on a T-shirt is basically the same as printing on a cosmetic bottle or jar. After all, both techniques push ink through a woven mesh screen using a squeegee!

However, behind the scenes, printing on a flat piece of fabric and printing on a rigid 3D container are two completely different worlds. Here is why the two processes require totally different equipment, inks, and surface preparation.

1. Shape & Movement: Flat Surfaces vs. Rolling Bottles

• T-Shirt Printing (Flat): A T-shirt is laid out completely flat on a board. A flat screen lowers down, and a squeegee presses ink straight down into the fabric. The shirt and frame remain still during printing.

• Bottle Printing (Rotary Motion): A bottle is curved and 3-dimensional. If you press a flat screen against a curved bottle, only a tiny line in the middle will touch. To print seamlessly around the curve, the machine holds the bottle in a custom jig and rolls the bottle underneath the screen as the screen moves sideways.

In short: T-shirt printing presses flat against stationary fabric, while bottle printing uses precision rotary gears to roll the bottle in sync with the screen.

2. How Ink Sticks: Absorbing vs. Solvent Surface Bonding

• Fabrics (Cotton / Polyester): Fabric is porous like a sponge. Textile inks (like Plastisol or water-based inks) soak into the woven threads and physically lock into the fibers.

• Packaging (Glass, Plastic, Metal): Glass bottles and plastic containers are completely non-porous—ink cannot soak into them. Instead, packaging screen printing uses specialized oil-based solvent inks. These inks contain aggressive solvents that evaporate as they dry, causing the resin and pigments to bite into plastic or form a durable chemical film on glass.

To ensure oil-based solvent inks achieve a grip on smooth plastics like HDPE or Polypropylene, plastic containers undergo surface flame treatment right before printing to increase surface energy.

3. Ink Chemistry: Soft Textiles vs. Oil-Based Solvent Inks

• T-Shirt Inks: Fabric inks are formulated to remain soft, flexible, and stretchable so the garment is comfortable to wear and won't crack when washed.

• Packaging Inks: Oil-based solvent inks for packaging are formulated for hard-surface adhesion and high durability. Once cured, they create a tough, glossy, scratch-resistant print that won't rub off during handling.

Frequently Asked Questions (Q&A)

Q: Do you print on T-shirts? saya mahu print baju.

A: No, we do not. While both processes use screens, our machines, holding jigs, and oil-based solvent inks are engineered exclusively for product packaging (such as glass and plastic bottles). We do not print on textiles, baju kita tak print ya.

Q: Why can't a bottle printing factory print a T-shirt on the side?

A: Bottle factories operate rotary machinery, flame treaters, and chemical solvent inks designed for hard, non-porous containers. Garment printing requires flatbed carousel presses and flexible textile inks designed to soak into cotton or polyester fibers, lain tau.