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Do you know the process characteristics 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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Composite bags are made by using an adhesive to bond films such as polyester, nylon, aluminum foil, and special polyolefins through a dry lamination process to create a composite film, which is then aged, slit, and formed into retort pouches. After food is packaged in the composite bag, it undergoes high-temperature sterilization at 121-135 ℃ for 30-40 minutes. Not only must the film used to make the bag be heat-resistant, but the adhesive used to bond the films must also be heat-resistant; otherwise, after retorting, the bonding strength between the films is likely to decrease, leading to delamination and other undesirable phenomena. Currently, the most important adhesive used in the composite film for retort pouches on the market is a heat-resistant retort pouch adhesive recently developed by a chemical research institute. After several machine composite tests, its retort resistance, content resistance, and hygiene safety meet the requirements of domestic manufacturers.
After composite gusset bags are used to package food, they undergo high-temperature sterilization at 121-135 ℃ for 30-40 minutes. The packaging materials used must be heat-resistant. Commonly used materials for retort pouch packaging include polyester (PET), nylon (NY), aluminum foil (Al), and cast polypropylene (CPP). The adhesive used is a high-temperature retort-resistant two-component polyurethane adhesive. The composite film is produced through a dry lamination process.
The main process of dry lamination is that the first substrate is coated with adhesive by a web-fed roller, then dried by hot air in a drying channel, and then laminated with the second substrate by a composite steel roller under heating and pressure before being wound into a composite film. Then, it is sent to a drying room for heating and aging for several days, after which it is slit and made into bags.
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