10690开头面试通知:do not use the translating sofeware what let me sick 2

PRE-TREATMENT before coating the appliance

The aluminium base shall be prepared in such a way as to ensure good adherence of the PTFE through the following methods:

• Sand-blasting for die-cast bowls or tanks, CG plates, boilers.
• Chemical pickling for pressed bowls or tanks
5.1 SAND-BLASTING
The sand-blasting shall be carried out with 60 mesh corundum balls (aluminium oxide).
5.2 CHEMICAL PICKLING
The pickling process shall take into account the type of aluminium alloy used.
5.2.1 Roughness
The roughness of the material (aluminium) after chemical pickling shall guarantee good adherence of the PTFE and allow it to be pressed: it shall therefore have a roughness Ra between 1.8 and 3.0 m inclusive.
The roughness profile shall also have a distribution of the No. peaks per cm according to the table:
这是一份规格来的，主要介绍的是不粘涂层喷在（炸锅/接触式烤盘/咖啡机加热器）表层的时候要对其先做的一些表面处理。
谢谢大家的帮助，这些我基本都能看懂，但就是专业知识不够，所以半懂不懂得。