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2021
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02
Static electricity has a serious impact on the production of composite bags
This article explores the patent landscape surrounding zippers, a common household item. You might assume zippers were initially designed for their current applications, but that wasn't the case. As the saying goes, where there's demand, there's a market; and innovation wins the market. Take zippers, for example. Before their invention, connecting two edges typically involved: (1) Buttons: Chinese button knots are still practical, and some clothing still uses them. (2) Laces: Iconic laces and bows. (3) Hook and Loop Fasteners: Unfortunately, I couldn't find an image; imagine a hook and loop working together. So, what would these methods look like on boots, especially the tall boots popular when zippers were in their infancy? Imagine replacing the zippers in the image above with buttons. Considering the less refined and durable buttons of that era, a pair of tall boots might have 20 or more buttons. Putting them on or taking them off might take 30 minutes each (for those with slow hands or less dexterity)... This is the environment in which zippers developed. Research reveals multiple claims regarding the origin (inventor) of the zipper. However, the earliest zipper-related patent I could find is: Those with mechanical knowledge might recognize the structural features of the diagram. However, the key point is the patent application date: August 27, 1914 – quite early! The second question is: how many zipper-related patents exist today? Using Baitian's patent search engine with the keyword "zipper", I found: Disregarding whether all patents relate to zipper structures (some might cover manufacturing processes), the image shows 5159 authorized and valid patents related to zippers. What does this mean? If you want to start a zipper manufacturing, business, or sales company, you must ensure your product's structure is either existing technology or entirely innovative, exceeding existing technology and patents. Otherwise, you risk receiving a notice of patent infringement (though the likelihood is low, the risk exists). I lack the resources to examine all 5000+ valid patents; those interested can explore further. This search is limited to domestic patents and uses the simple keyword "zipper." Zippers are also called "zipper locks," but "zipper" is more common. Internationally, even the Japanese term, when translated, isn't "zipper" but "clamp," which is quite puzzling. A complete search would require considering broader concepts like "sliding fasteners" and "tightening devices." This might yield a more comprehensive result. Please point out any omissions. This and future content aim to promote and popularize patents. Feel free to discuss further if you're interested. Any similarities are purely coincidental.
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Static electricity is easily generated during the production of products in flexible packaging factories. However, this static electricity has a serious impact and hazard on the production of plastic composite bags, often leading to printing failures and even personnel danger. Why is the tearing sound of plastic bags so loud? Today, we will explain this to you, or is it simply because the sound of plastic bags is particularly easy to feel? Is it the characteristic of the plastic bag itself? So what are the hazards of static electricity to flexible packaging manufacturing? Let's talk about it below.
Composite bag
1. The static electricity generated on the printing surface of the metal wire composite film will be transferred to the ink through the printing plate. The ink contains a large number of unsaturated groups and particulate fillers. Static electricity will be adsorbed on the ink particles and further absorb more particles, becoming larger ink particles. Finally, due to the adsorption characteristics of static electricity, the ink particles become larger, leading to the appearance of printing cut lines. Therefore, static electricity is also one of the main causes of printing cut lines.
2. Cause flexible packaging products to adhere to each other - Static electricity can cause printed materials to adhere to each other, making them difficult to separate. For paper printing, there will be adverse consequences such as double sheets, blank sheets, irregular paper collection, misregistration, and increased losses. For plastic printing, there are phenomena such as sticky bags, poor opening, and dust adsorption.
3. Lead to printing defects - If the surface of the printed matter is static, it will absorb dust floating in the air, which hinders the transfer of ink and leads to missing printing spots on the surface of the printed matter.
4. Make the winding end face irregular - When the static electricity of the film is not completely eliminated, due to the winding characteristics of the winding, when hundreds or even multiple layers of film are wound together, the static electricity on the film repels each other, and the interlayer films repel each other, resulting in irregular winding. When the horizontal parallelism accuracy of the equipment is low, this is also the main reason for the irregular winding.
5. A large amount of static electricity generated by the winding causes a fire - The winding is a multi-layer winding structure. The electrostatic field energy accumulated in each layer is not large, and the static electricity in each layer may only be a few hundred volts. However, when hundreds or even multiple layers of film are wound together, the voltage and energy of its electrostatic power plant are very large. In severe cases, the voltage reaches more than 20 kilovolts and more than 100 kilovolts. The winding is close to the final color printing unit. When high-voltage static electricity releases solvent-based ink, it is easy to cause a fire. Many fires have proved that the collected static electricity is the most important cause of the fire.
6. Cause ink spots and whiskers - The static electricity on the substrate of the printed matter will be transferred to the ink through the printing plate, causing the ink to carry static electricity. When the ink is transferred to the surface of the printed matter, due to the static electricity of the ink and the static electricity of the printed matter substrate at the same time, the static electricity or neutralization discharge or the same sex repels each other, and normal printing cannot be achieved. In shallow screen printing and mesh printing, the phenomenon of "missing dots" often occurs, which seems to be due to uneven inking and poor ink fluidity, but it is actually caused by static electricity, which is called "static electricity ink spots". In solid printing, the statically charged ink will discharge at the edge of the solid on the printed matter, resulting in hairy-like defective products at the edge of the solid, which is called "static electricity ink whiskers".
7. Electronic equipment damage - The current and electromagnetic field during static discharge affect the normal use of electronic equipment, and in severe cases, it can cause damage to electronic equipment. In actual production, the tension controller and peach computer installed in winding and unwinding are easily damaged, and the root cause is static electricity.
8. Electric shock operators - When static electricity accumulates to a certain extent, it will cause harm to operators and make it inconvenient for operators to carry out normal production.
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