The picture is a group photo of our after-sales staff and client, as well as the dog food extruder machine and screw that had been used for many years. The quality is undoubted must be considered, when customers buying machinery and equipment. Many customers will ask how long is the warranty period of our equipment? The warranty period of our complete machine is one year, but in fact, many customers have not had problems after using it for many years. Also, the screw of an extruder is consumable. If the seller readily promises you that it will be no problem for a few years, then I want to remind you to carefully consider the seller’s promise, because the life of the screw not only depends on its materials and processes but also depends on raw materials and work intensity. The life of the screw is different, that working 8 hours a day and working 24 hours a day, as same as the life of the screw will be different if the raw materials used for processing feed are different. Therefore, the life of the screw can only be a rough reference value. The screw of our company is treated with alloy nitriding, and the life of the screw is longer. The screw can also choose the modular structure of building blocks, which can be combined according to different needs.