27
2021
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02
Why do plastic bags (PE bags) make such a loud tearing sound?
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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Why do plastic bags make such a loud tearing sound? Today, we'll explain this, or is it simply because the sound of plastic bags is particularly easy to perceive? Is it an inherent characteristic of the plastic bag itself? How would you explain it?
Sound is produced by vibrations, and the intensity of the sound depends on the strength of the vibration. This is the energy released during this dimensional process, and the conversion of energy is clearly what people work on. Comparing the difference between a plastic bag and a table, a plastic bag is very light, and it's obvious that it will undergo more substantial movement and shape changes (including itself). According to the work formula x = force displacement (W = F(S)), the work done should be greater during this process. When you tap a table, there is only a small deformation, and the displacement is zero, as the force naturally does this work. Of course, there is a process of conversion to other forms of energy, but overall it is not significant.
Sound is the shape of an object; it compresses air, changing its local density, and transmits it to the ear via waveforms. To understand why plastic bags make such a loud sound, a light touch with a thin one can be explained as follows: 1. The plastic bags we use daily are mainly PE or PVC films, which are very flexible. The plastic bag requires low energy to change its configuration and conformation at the microscopic level; and because of its film-like nature, even a child has the strength to pinch it. When a person lightly touches a plastic bag, the force is sufficient to change the structure of the polymer chains in the plastic bag. 2. Polymer chains are very small, and the number of them in a macroscopic plastic bag is considerable. When plastic deformation occurs in one part, it involves the deformation of a large number of polymer chains, and the compression of the surrounding air is enough for the human ear to hear the sound.
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