mold in the process, some parts due to not to put too much friction with the impact of higher wear and tear. At this time. This is just part of the replacement parts can still be used for molds.

In addition. Sometimes as long as the work of replacement parts to achieve a new product production. Removable not only caused a large number of reusable parts and components of the waste material. And as a result of poor waste disposal. Will severely pollute the environment. In the early design and therefore it is necessary to take into account the issue of demolition:

1) general structure of choice as far as possible in order to be replaced.

2) strength in meeting the requirements under the premise. The widespread use of removable connection. If the connecting thread with no welding, riveting, and so on.