In addition to the requirements of accurate bronzing position, a smooth and bright surface, balanced and uniform pressure, no blistering, and no paste issues during production, it is also essential that there should be no visible indentation along the edges of the bronzing pattern. The adhesion must be strong, and there should be no noticeable scratches or marks. Everyone knows that the bronzing process involves heating and pressing the paper. Throughout production, it's crucial to minimize factors that cause paper deformation, as this greatly contributes to the smooth progress of subsequent gilding steps and improves product quality rates.
Now let’s discuss the control, common faults, and troubleshooting in bronzing quality:
First, the bronzing plate.
The production of bronzing plates typically uses photo-etching or electronic engraving techniques, with materials mostly being copper or zinc plates. Copper plates offer finer details and better surface finish and heat transfer compared to zinc plates. Using high-quality copper plates can enhance the gloss and clarity of the bronzing images. Traditional photo-etching methods are simple, cost-effective, but have a shorter lifespan, making them suitable for text, thick lines, and general images. On the other hand, electro-engraved plates allow for more detailed and rich tonal variations, and they offer higher printing resistance, making them ideal for cigarette packaging and products with strict quality demands, especially in large batches.
Second, the appropriateness of bronzing.
This refers to the selection of anodized aluminum and the matching of factors like speed, temperature, and pressure. The hot stamping process includes: preparing the bronzing plate, adjusting the parameters for the pad version, trying a sample, and then proceeding to formal hot stamping.
Third, bronzing failures and troubleshooting.
If the hot stamping doesn't occur or the image isn't clear, it could be due to the surface characteristics of the printed material, the properties of the anodized aluminum, or improper temperature and pressure settings. For example, excessive powder on the printed surface, ink not fully dried, or the presence of additives like debonding agents or varnish can interfere with the adhesion of the anodized aluminum and the paper. These issues can be resolved by removing excess powder or adjusting the printing process.
Choosing the wrong type of anodized aluminum can directly affect the durability of the bronzing. The right type should be selected based on the size of the gold foil area and the material being stamped. There are many types available on the market, each suited for different substrates and applications. They differ mainly in their adhesion and peeling performance.
For general products with standard ink colors, 88-I or KURZ PM types are commonly used. For dense ink-colored prints (including gold and silver) on cigarette packs and cosmetics, 88-2 type is preferred. For fine stroke hot stamping on cigarette labels or cosmetic packaging, 88-3, 88-4, or PM288 types are recommended. For laminated paper, cardboard with UV ink, or glazed paper, 88-4, K series, LK series, or SP series anodized aluminum is appropriate.
Another issue is incorrect matching between the hot stamping equipment, time, and temperature, which can affect both the adhesion and the clarity of the design. For example, high-speed circular machines may require higher temperatures than flat ones. Typically, round pressing occurs at 190–220°C, while flat pressing is around 100–120°C. However, these parameters are also influenced by the transfer performance of the anodized aluminum. It's important to check if the pressure is even and whether the bronzing plate is damaged if some areas aren’t properly stamped.
Anti-pull happens when the anodized aluminum removes the ink or varnish from the printed surface after stamping. This often occurs if the ink isn’t dry or if the UV coating isn’t properly applied, leading to poor bonding between the ink, UV oil, and paper. Ensure the printed material is fully dry before stamping, and consider using anodized aluminum with lower separation force and good heat transfer properties.
Discoloration or pasting of the anodized aluminum after stamping is usually caused by poor plate quality, loose installation, or misalignment of the foil. High temperatures can also lead to discoloration. To prevent uneven coloring, lower the temperature slightly. For round flattening models, adding a fan near the foil feeding area can help keep the foil taut and prevent it from touching the plate prematurely, which might cause burning.
Lastly, fragile outlines in images or text can result from improper lamination. If the gold foil is easily smudged, it may be printed first and then coated, which can damage the surface gloss of the anodized aluminum. Avoid using water-soluble glue coatings, as they can cause dark spots on the aluminum surface and lead to gold particles sticking to the edges of text, creating a ghosting effect.
BedRoom Mattress
A good mattress is essential for achieving quality sleep, impacting not only your comfort but also your overall health and well-being. Our extensive collection of bedroom mattresses offers a variety of types, materials, and firmness levels, ensuring you can find the ideal mattress that meets your unique sleeping preferences and needs. Whether you are a side sleeper, back sleeper, or stomach sleeper, we have options designed to provide optimal support and comfort throughout the night.
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Innerspring mattresses, featuring traditional coil systems, are another widely favored option. These mattresses offer a classic feel and provide excellent support and breathability. The coils promote airflow, helping to regulate temperature during sleep. Innerspring mattresses come in various firmness levels, from plush to firm, catering to individual preferences. They often have a layer of cushioning on top to enhance comfort, making them suitable for various sleeping positions.
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For those who prefer a customizable sleeping experience, adjustable mattresses are available, allowing you to change the firmness level according to your preferences. Many of these mattresses come with dual firmness options, perfect for couples who have different firmness needs.
Choosing the right size mattress is also essential for your comfort. Our collection includes various sizes, such as twin, full, queen, and king, ensuring you find the perfect fit for your bed frame and sleeping space.
When investing in a mattress, quality is key. Our bedroom mattresses are crafted with premium materials designed for durability and long-lasting comfort. Explore our range of bedroom mattresses and discover the perfect combination of support and luxury that will transform your sleep experience, allowing you to wake up refreshed and ready to take on the day. With the right mattress, you can create your ideal sleep sanctuary, promoting better rest and overall well-being.
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