Plastic gravure inks are solvent-based inks that contain volatile solvents, along with pigments, binders, resins, additives, fillers, and other components. These inks play a crucial role in the gravure printing process, which involves a series of precise steps that require careful attention to detail. As it turns out, there's a lot more to consider than you might initially think.
When it comes to gravure inks, they must meet several specific requirements to perform effectively during the printing process. The ink is applied onto the engraved cylinder while it rotates, and then a doctor blade removes the excess ink from non-image areas, leaving only the ink within the engraved cells. This ink is then transferred to the printing substrate. Based on this process, gravure inks need to have the following characteristics:
1. The working ink should be a thin, fluid substance with excellent flowability, allowing it to easily fill the fine cells on the printing cylinder.
2. It must have good squeegee compatibility, meaning it can be efficiently scraped off by the doctor blade without leaving residue or causing damage.
3. The ink needs sufficient cohesion to resist separation due to centrifugal force during high-speed operation.
4. It should exhibit good transfer properties and viscoelasticity, ensuring that the ink in the cells transfers smoothly to the substrate without smudging or distorting images, lines, or dots.
5. Once transferred, the ink should spread evenly and form a smooth, uniform film on the printing material.
6. The ink must dry quickly through solvent evaporation, with a drying speed that matches the printing speed for optimal efficiency.
7. It should have adequate resolubility, allowing any untransferred ink in the cells to be re-dissolved back into the ink system during the process.
The performance of gravure inks must first satisfy the demands of the printing process itself. Additionally, the ink layer transferred to the substrate must withstand various post-printing processes and environmental conditions throughout the product’s lifecycle.
The original ink, before use, typically doesn't meet all these requirements directly. Therefore, it is adjusted into the working ink according to its properties and the specific needs of the printing process. Although the original ink's characteristics set limits on how much adjustment can be made, this step is essential for achieving optimal print quality.
Standards such as QB/T 2024-2012 provide clear specifications for the quality and performance of plastic gravure inks. However, compliance with these standards does not always guarantee superior printability. Real-world performance often depends on factors beyond just meeting basic criteria.
Wood Fired Pizza Oven
Wood-fired ovens come in various styles and sizes, ranging from portable outdoor ovens to large, built-in units found in restaurant kitchens. Despite advancements in technology, the fundamental principle of using burning wood to create even, high temperatures for baking remains consistent over the centuries.
Wood-fired ovens are specifically designed for cooking pizzas using wood as the primary heat source. The wood fire heats up the bricks inside the oven, providing the perfect cooking surface for the pizza.
These ovens typically use dried hardwoods like maple, oak, hickory, and walnut to generate optimal flames and smoke. These hardwoods burn cleanly and impart excellent flavors to the food.
Once the wood-fired oven reaches full temperature, pizzas are cooked at incredibly high temperatures, ranging from 750° to 850° Fahrenheit. This intense heat allows pizzas to cook in a rapid 2 to 3 minutes, resulting in a charred crust that adds to the flavor profile.
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