ASO Co., Ltd.

 Polyethylene is an extremely flexible material widely used across industries. Its popularity stems from key characteristics such as cost-effectiveness, durability, and flexibility. Moreover, unlike PVC, polyethylene does not emit harmful dioxins during incineration, making it a much safer option for both users and the environment.

 The answer lies in its most notable feature—its thermoplastic nature. As a thermoplastic resin, polyethylene can be re-melted when heated, allowing it to be easily molded and bonded into various shapes. This property enables a manufacturing method known as heat sealing, which is commonly used to convert polyethylene film or tubing into bags using bag-making machines.

 Polyethylene softens at approximately 80°C–90°C and melts around 110°C–120°C, making it easy to process using heat sealing. At our company, we not only manufacture standard polyethylene bags using this method but also produce a wide variety of secondary processed products that take advantage of polyethylene’s unique properties.

 For example, we manufacture pallet covers—rectangular or cube-shaped polyethylene covers designed to protect goods like raw material bags, drums, and cardboard boxes stacked on pallets from rain, dust, and debris. These are fabricated by cutting polyethylene sheets or tubes and sealing them using heat. Additionally, we produce gusseted bags commonly used as inner liners for cardboard cases.
 

 Some of our pallet covers are also fitted with elastic bands at the bottom to prevent them from being blown away when used outdoors. This is also a result of the excellent heat sealability of polyethylene.

 In addition to bags and covers, we also manufacture more complex items such as tamper-evident liners and gusseted inner bags, and we are capable of heat-welding molded polyethylene parts—such as spouts and caps—directly onto film surfaces.
 

 However, while polyethylene’s heat sealability offers numerous advantages, it also presents certain technical challenges. For instance, when attaching molded parts, the compatibility between the resin in the film and the molded component must be carefully considered. Incompatible materials can result in poor bonding strength or detachment of parts during use.
 

 It is also important to note that heat sealing is only effective between identical or highly compatible materials. Even within polyethylene itself, differences exist: sealing HDPE (High-Density Polyethylene) to LDPE (Low-Density Polyethylene) or LLDPE (Linear Low-Density Polyethylene) can lead to insufficient bonding strength. Therefore, material selection must be based on thorough analysis, not just visual similarity. This becomes especially critical in heavy-duty logistics applications, such as our inner liners for containers and drums, where material performance is vital.
 

 Lastly, polyethylene films can be easily modified during the inflation process by incorporating additives such as color toners, UV absorbers, anti-rust agents, and anti-static agents using a masterbatch blending method. This flexibility enables us to offer customized solutions, such as UV-resistant gusseted covers, which we produce with ease to meet specific customer needs.