People spend a lot of time choosing the right plastic material for a part by running simulations, attempting material trials, debating over PP homopolymer and copolymer for half a week. However, the mold steel is sometimes selected with far less attention. Well, that’s literally going backwards. The steel determines the following things: How long that […]
We hear it all the time from buyers visiting our facility. They walk in, look at the plastic injection moulding machines, check the tonnage ratings and the platen sizes, and start making assumptions about capability. Bigger machine, better parts, right? Wrong. And we'll tell you exactly why. At Rustagi Polymers, we offer injection mold services, […]
So you want that flawless chrome-like finish on your plastic parts. The kind that looks like it came straight off a luxury car assembly line. Most people focus on the vacuum metalising machine, the deposition rate or the metal target. But in reality, the primer coat is where it all starts. If that layer is […]
Coating adhesion failures on plastic parts rarely come down to the coating itself. The coating is almost always fine. The problem is what the coating was asked to bond to, a surface with mold release contamination, residual moisture from a poorly dried part, or a gate vestige that nobody addressed before the part went into the […]
Single-colour pad printing is a fairly forgiving process. You set up one cliché, one ink cup, one pad, and you print. Multi-colour pad printing is a different story entirely. The moment you introduce a second colour, let alone a third or fourth, you're managing registration between each strike, ink compatibility between layers, and the risk […]
If you've spent time around a pad printing line, you've probably seen a job that looked right in trial but started drifting in production. Print edges getting soft. Coverage turning patchy on one side of the part. Or the pad picking up a slightly different amount of ink as the run goes on and the […]
Spray painting for plastic parts is one of those processes where the standard approach works acceptably for most applications and fails in critical precision applications. The cases where spray coating interacts badly with thin walls, small features, and precision components are more common than the industry tends to acknowledge. This is a technical guide for […]
Spray painting a flat plastic panel is straightforward. You set the gun, maintain a steady pass, and as long as the surface is clean, you get a consistent result. But the moment you're dealing with parts that have fine ribs, narrow slots, snap-fit hooks, or walls under a millimetre thick, you're in different territory. For […]
Injection molding and vacuum metallizing are complementary processes. While injection moulding makes complex plastic shapes at high volume and low cost. Vacuum Metalizing adds a metallic finish that looks like metal but weighs almost nothing and doesn't rust over time. In practice, getting the combination to work well consistently, across a large production run, to […]
There's a conversation that keeps coming up in manufacturing facilities, particularly among procurement heads and product designers. The conversation usually starts the same way: someone brings up compliance costs, or an environmental audit comes back with a list of concerns. And suddenly, vacuum metalizing starts looking a lot more interesting than it did before. The […]
