长城卡扣主要用于高温肉食品的包装工艺，能够有效保证封口工序介质的储存性能，在食品包装中发挥重要作用。所有长城卡扣在设计时不能马虎大意，因为它关系着人们的食品安全，在设计时需要注意以下几点： The long city card is mainly used in the packaging process of high-temperature meat food, which can effectively guarantee the storage performance of the sealing process media and play an important role in food packaging. All long city card buckles should not be careless in design, because it is associated with people's food safety, when designing, need to pay attention to the following points: 　　1、选择合适的变形量。长城卡扣通过紧固件的变形和反弹来实现安装。而太小的变形量容易造成安装不牢固；太大的变形量又容易导致安装困难甚至无法安装，破坏长城卡扣。所有选择合适的变形量非常重要。 1. Select the appropriate deformation quantity. The long city card is installed through fastener deformation and rebound. Too small deformation can easily cause the installation to be unstable; Too much of the deformation can easily cause the installation to be difficult or even impossible to install, damaging the long city card buckle. It is important to choose the right amount of deformation. 　 2、设计时，注意要使长城卡扣在安装靠位时出现一些比较明显的现象，如声音以及手感上的变化。 2. When designing, pay attention to the appearance of some obvious phenomena such as sound and the change of hand feeling in the position of the long city card. 　　3、设计时，注意长城卡扣的约束数量，不能出现过约束的情况。约束过多，对零件的加工精度要求较高。在实际装配过程，容易导致安装不到位或不能安装。 3. When designing, pay attention to the constraint quantity of the long city card, which cannot be restricted. Too many constraints, the machining accuracy of parts is higher. In the actual assembly process, it is easy to cause the installation not to be in place or not to be installed.