White ink usage on screen printing machine

For most garment screen printers, choosing white ink has become their habit. We usually have a prior idea of ​​the ink we like. Large garment printing plants can use any type of hot melt ink on their automated presses. Only manual printing presses in small printing plants and hand proofing printing presses in large printing plants need to choose apparel hot melt inks. In this type of printing press, the performance of the ink is the easiest to evaluate. Although you can now use any type of ink, the human factors in the screen printing process can amplify the characteristics of the ink.

White ink

White hot melt inks play the most important role in the day's work of manual press operators. In printed clothing designs, more than half of the designs require white ink. The biggest challenge for printers is choosing the best ink for printing needs. Almost every manufacturer of hot melt inks has hundreds of white ink formulations, and they sell a dozen or more inks at every moment. Even though some white hot melt inks are of special use, their composition is still vague.

You must have a general understanding of the existing products. There are now four whites that can be used for manual printers to meet different needs.

Ink. They include a basic cotton white, a white for a 50/50 cotton/polyethylene T-shirt, a nylon white, and a polyester white for 100% polyethylene fibers.

Cotton white:

White hot melt inks for cotton materials are the easiest to use. Cotton fiber limits ink performance less than other materials. The most attractive features of this material are: simple printability, good opacity, and good reflectivity. There are many versions of this type of hot melt ink on the market. The best method is to try as many as possible and find the one that works best for you. The performance of all these products should be similar.

Anti-absorption white:

Anti-absorption white hot melt inks pose great challenges for both manufacturers and end users. This is the most widely used white ink in the market, and the competition in the market is fierce. Manufacturers of hot melt inks will launch a new anti-absorbing white ink approximately every 12 to 18 months. These manufacturers have been trying to improve the formula of white products, hoping to gain more shares in the apparel silk screen market.

The challenge of using anti-absorbing hot melt inks comes from the performance requirements of these products. These requirements include superior printability, quick-drying, high gloss, good opacity, soft touch, durability, good smoothness, and post-flash. Each feature requires manufacturers to make different formulations, so you will find a wide variety of anti-absorbent white inks on the market. You have to try different types of inks from different manufacturers to find the one that suits you best. Most of the anti-absorption white inks have their own areas of expertise; we cannot concentrate all of the above-mentioned properties into one product.

From the printer operator's point of view, I give the following priority parameters:

1. Printability

2. Opacity

3. Absorption

4 good after-flash

5. Feel

6. Gloss

7. Good aging

The top three factors in this list are the issues I first emphasized in my book. And, if you want to know, "aging" refers to the ink's good printability over a long period of time, but the rate of viscosity growth is not very fast. Although this sounds trivial, you don't want to face a half-gallon (or one-half a barrel used by a large print shop). These products are too thick for printing. In this regard, some white inks perform better than others, so you have to try these different products yourself.

Nylon white:

Nylon white is another different color because they have special performance parameters. Nylon inks were first used in print shops that served the sports uniform market. The fibers here include nylon micronets and high-stretch fibers such as Lycra. The structure and composition of these materials may change as the manufacturer does not use them, so you must test your inks on these products and conduct a comprehensive study of these materials. The performance of these inks varies greatly depending on the manufacturer and the purpose of use. You need to pay attention to the characteristics of a good nylon hot melt ink has: opacity, printability and durability.

Polyester white:

Polyester white can pose the greatest challenge for all inks. This is especially true for people using manual presses. When printed on the most troublesome polyester fibers, polyester white can also exhibit maximum resistance to absorption. Not all of these inks are easy to print. The performance parameters of these inks depend on the compatibility of the fibers rather than the ease of printing. The printing performance of polyester white produced by different manufacturers is also very different, so you need to try different brands of products to make the final choice

When you want to use polyester white ink, the most critical thing is to listen to the opinions of other printers and find the most practical product. It is also important to contact the newly introduced inks on the market to extract their samples.

For manual press operators, the most important thing is to have a good product, which means that there is no need for special handling or major changes to the printing program. But this is where the problem arises. You must have a deep understanding of the variability of inks, fibers, and printing presses and have some experience. You must also conduct your own bleeding test to test whether this product is really resistant to absorption on the fibers you print.

Unfortunately, not all fibers can be used for screen printing. To print, consult the fiber manufacturer. I consulted the manufacturer about their tough fibers. They told me not to print on these fibers. This is one of the things your customers don't want to hear, but before doing this, it's best to let them know. If you encounter such fiber, it is best to give up - or help customers find alternatives - do not risk printing, regardless of fiber bleeding problems.

Please choose carefully

The white hot melt ink you use on hand-made equipment will have a certain influence on the company's productivity and profitability. Careful inspection of white inks from different manufacturers may seem like a daunting task, but the time you spend selecting inks will be compensated for in higher print quality and fewer printing problems.

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