2. Process of making:

3. Factory introduction

    Our factory is state-of-the art and spans over 20,000 square meters. The factory houses more than 130 sets of different domestic and foreign high precision production equipment, with the degree of numerical control up to 95%.

4. Raw material guarantee

    The company has been cooperating with domestic and foreign first-line brand material suppliers for a long time, and has a strict quality control and performs regular audits and inspection of the factory (elemental analysis, metallographic analysis, ultrasonic flaw detection, etc.) to ensure a 100% qualified status.

5. Heat treatment 

    As we all know, heat treatment is very important in the screw production process. In order to ensure the quality of products, Joiner has purchased professional heat treatment equipment to produce, so that we can control the construction process by ourselves. In China, we are the only company that does heat treatment by ourselves, and the heat treatment of screw components made by Nanjing factory is processed by outsiders, so the quality of products can not be completely guarantee.

6.  Packing & Delivery
Packing Details : Using antirust peper,  then bubble, next fixed in the peper case.
Delivery Time: Shipped in 60 days after payment .

7. Extruder Screw Elements Testing Reports for Our customer
We will send Inspection reports for every our customer.
a. General Dimension Inspection Report
b. Material certificate for customer.

8. All types of screw we produce: