1. What different between yarn “Heat Set” and “Non-Heat Set” ?  

On the left hand, a normal yarn after the twisting process which the torsion was not fixed, when released the yarn out the cone they will twist together fromthemselves.
On the right hand, we used the hot steaming machine to fixed the yarn torsion, as a result, they will not twist together by themselves. The benefit of “Heat Set yarn” is to help in the sewing purpose.

2. What is Round End (Round Edges)?  

Between above pictures, on the left is normal shape but in the right hand is a special shape that we called “Round End” or “Round Edges” the purpose is to help in the dyeing process.

3. How to test which twist direction of the yarn?  

S-twist thread.


Grasp a length of thread between the thumb and forefingers of each hand.Roll your thumbs toward the tips of your fingers. If the thread twist gets tighter as you roll, the thread is an S-twist If the twist loosens as you roll, the thread is a Z-twist.

4. Why we need yarn lubricant?  
Yarn Lubricant is used on all types of yarn to prevent friction and static. With less friction, the needle stays cooler and the yarn is less likely to shred or break or the machine to skip stitches.

5. What is "International Commercial Terms (INCOTERMS) ?  

Letter of Credit (L/C)

A letter of credit is the most common payment instrument used in foreign trade because it offers protection to both parties in the transaction. When the process of the L/C is followed, the instrument ensures payment for the supplier, and shipment for the buyer, as well as allowing for provisions to control the quality and quantity of the goods for the importer.

Telex Transferring (T/T)

A telegraphic transfer is a message forwarded electronically by telex instructing a correspondent bank to pay a specific amount of money to the beneficiary of the transfer on behalf of the remitter.

FAS – Free Alongside Ship

The exporter’s obligations are fulfilled when the goods have been placed alongside the principal ship at the dock or specified port. The buyer then assumes all risks and costs.

FOB – Free on Board
The exporter’s obligations are fulfilled when the goods are placed on board the ship. The buyer then assumes all risks and costs.

CFR – Cost and Freight
The exporter pays all costs necessary to transport the goods to the named destination. Risks are transferred to the buyer when the goods pass over the ship’s rails.

CIF – Cost Insurance Freight
Same as CFR except the exporter also has to provide marine insurance.