How to Avoid Blotchy Results Occurred in Sublimation Process
Blotches and spots in your transfers can happen at any time and anywhere. This is a problem generally caused by excess moisture in the environment or on the substrate.
Left: Perfect transfer result. Right: Blotches and spots in a poor paper
Common sublimation materials like polyester fabric, hardboard, plastic and even metal materials like aluminum and stainless steel can be sublimated, and what happens when there is moisture on a substrate? When water is heated, it turns into steam vapor which starts to escape upward, however, since dye-sublimation ink also turns into a gas, the steam vapor from the areas that have even the smallest amounts of moisture clash with the sublimation gas which will prevent a full and consistent transfer.
So how to resolve this blotchy results? The quick solution is to pre-press substrates immediately before applying & heat pressing the sublimation transfer. Pre-pressing is done by placing the item in the heat press, covering it with a protective sheet such as silicone or Teflon to avoid scorching or getting it dirty. Only a fraction of the time is necessary, generally about 10-20 seconds. The temperature and pressure should follow the recommendations for the particular item. If you see steam, that is a sure sign that there is moisture. With larger or more expensive substrates, we recommend pre-pressing closer as per the instructions to avoid potential failed results. For additional protection, you may use a layer of polyester fabric which will wick away the escaping moisture. Allow the item to cool before moving onto the actual transfer to avoid sublimation being activated too soon which can result in ghosting (blurriness).
Moisture may exist everywhere at any time, but especially in the summer months, and substrates travel though different areas that may be more humid or hotter than your location, so a general rule of thumb is to always pre-press. It will add a little bit more time to the process but save your money anyway.
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Email:vision@itransferpaper.com
Tel:86-2164950453
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