Meltblown die and method

Details Meltblown die and method Meltblown die and method

1982-11-17

1985-07-02

Lowe, James

Plastic and nonmetallic article shaping or treating: processes

Formation of solid particulate material directly from molten...

By impinging or atomizing with gaseous jet or blast

264518, 264DIG75, 425 7, 425 72S, 425464, B29F 304

Patent

active

045267332

ABSTRACT:
Improvement to the die and method of forming meltblown fibers and webs using a relatively cool fluid for meltblowing. Thermoplastic polymers such as polyolefins, polyamides, polyesters and the like are spun in accordance with the meltblowing process and contacted by a fluid which forms fibers and attenuates them. In accordance with the invention, the fluid is substantially cooler than the molten polymer and permits formation of webs at shorter forming distances greatly improving web formation. In addition, the costs of manufacture are improved since heating of the attenuating fluid may be reduced or avoided. In a particularly preferred embodiment, the die is provided with insulation between the attenuating fluid and the polymer chamber to avoid or reduce the tendency of the molten polymer to cool and cause plugging of the die. Alternatively, the die may, itself, be formed from an insulating material. Webs produced in accordance with the method and die of the present invention display highly desirable properties such as uniformity, softness, opacity, cover and the like.

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