Melt-spinning

Melt-spinning

Melt spinning is a typical spinning of synthetic fiber such as Polyester, Nylon, Polypropylene. Melted polymer is discharged from the spinneret.
The discharged fiber is wound after quenching process and drawing process.Melt spinning is used for various polymers and applications.

>Melt-spinning nozzle

  • Round hole SEM pictureRound hole SEM picture
  • Enlarged pictureEnlarged picture
  • Y-shaped hole SEM pictureY-shaped hole SEM picture
  • Enlarged pictureEnlarged picture
Material Stainless steel, others
Application Textile, Industrial yarn
Hole size Round/irregular-shaped hole range 0.1mm dia to 3.0mm diat
Polymer
  • ・Polyester
  • ・Nylon
  • ・Polypropylene
  • ・Polyethylene
  • ・Vinylidene

Accuracy of holes for melt spinning use

  • Round hole
  • Irregular shaped hole

■Round hole

Hole diameter L/d Accuracy of hole diameter Accuracy of capillary length
Special Standard Special Standard
Φ0.07~Φ1.0 1/1~5/1 ±0.001 ±0.002 ±0.01 ±0.02
Φ1.1~Φ2.0 1/1~20/1 ±0.003 ±0.005 ±0.02 ±0.03
Φ2.1~ 1/1~30/1 ±0.003 ±0.005 ±0.02 ±0.03

■Irregular shaped hole

Slit width L/W Accuracy of slit width Aaccuracy of capillary length
Special Standard Special Standard
0.04W~0.1W 1/1~18/1 ±0.001 ±0.002 ±0.01 ±0.02
0.11W~0.8W 1/1~20/1

Special Treatment on Surface

By coating on the nozzle surface, various performance can be given.Optimum coating materials can be selected depending on the raw materials used, spinning and cleaning condition.
It also contributes to cost saving such as extended life time and maintenance during operation.

■Typical example of coating we can make

  coating with single element coating with mixed plural elements special coating
Cr Si TiN CrN Si3N4 TiC SiC T7
surface roughness depending on surface roughness of base material
hardness HV500 HV700 HV2300 HV1900 HV1300 HV2500 HV2000 HV2300
coating thickness 0.1~5um

List of irregular hole shape

By changing polymer combination and spinning condition, fiber spun from irregular shaped hole can obtain various type of characteristic.The hole shape is selected based on required performances.

List of irregular hole shape