Stabilized filament drawing device for a meltspinning apparatus and meltspinning apparatus including such stabilized filament drawing devices
View Patent ↗A stabilized filament drawing device for a meltspinning apparatus and a meltspinning apparatus including the stabilized filament drawing device. The stabilized filament drawing device applies a high-velocity flow of air to attenuate the filaments, which are discharged from a device outlet in a discharge direction. The filament drawing device includes multiple inclined guides adjacent to the outlet that cause the filaments and high-velocity flow of air to deviate from the discharge direction. Each of the guides has a major surface that is angled relative to a common plane containing the discharge direction and a cross-machine direction of the device outlet of the filament drawing device. The guides are oriented such that the major surface is also inclined relative to the discharge direction.
1. A drawing device for attenuating a plurality of filaments in a meltspinning apparatus, the drawing device comprising:
a manifold including an inlet for receiving the filaments, an outlet oriented in a cross-machine direction, and a passageway between said inlet and said outlet, said manifold having a slotted channel communicating with said passageway for discharging air to impinge the filaments in said passageway and said manifold discharging the filaments and the air from said outlet in a downward direction perpendicular to said cross-machine direction;
a plurality of first guides positioned proximate to said outlet, each of said first guides including a first major surface oriented at a first rotational angle relative to said cross-machine direction; and
a plurality of second guides positioned proximate to said outlet, each of said second guides positioned between a corresponding adjacent pair of said first guides, each of said second guides including a second major surface oriented at a second rotational angle relative to said to said cross-machine direction,
wherein said first and second major surfaces are inclined with different inclination angles relative to said downward direction so as to cause the flow of air and the filaments to deviate from said downward direction.
2. The drawing device of claim 1 wherein said first rotational angle is equal to said second rotational angle.
3. The drawing device of claim 2 wherein said first and second rotational angles are approximately 75°.
4. The drawing device of claim 1 further comprising:
a body carrying said first and second guides and having a side proximate to said outlet, said first and second guides being integral with said side of said body.
5. The drawing device of claim 4 wherein said body includes an edge adjoining said side, said first and second guides diverging in said downward direction from said edge, and said first and second guides each including a facet proximate to said edge.
6. A meltspinning apparatus for depositing filaments on a collector to form a nonwoven web, comprising:
a spin pack capable of forming filaments from a thermoplastic material;
a drawing device including an inlet for receiving the filaments from said spin pack, an outlet oriented in a cross-machine direction, and a passageway extending from said inlet to said outlet, said drawing device having a slotted channel communicating with said passageway for discharging air to impinge the filaments in said passageway, and said drawing device discharging the filaments and the flow of air from said outlet in a downward direction perpendicular to said cross-machine direction;
a plurality of first guides positioned proximate to said outlet, each of said first guides including a first major surface oriented at a first rotational angle relative to said cross-machine direction; and
a plurality of second guides each positioned between a corresponding adjacent pair of first guides, each of said second guides including a second major surface oriented at a second rotational angle relative to said cross-machine direction,
wherein said first and second major surfaces are inclined with different inclination angles relative to said downward direction so as to cause the flow of air and the filaments to deviate from said downward direction.
7. The meltspinning apparatus of claim 6 wherein said first rotational angle is equal to said second rotational angle.
8. The meltspinning apparatus of claim 7 wherein said first and second rotational angles are approximately 75°.
9. The meltspinning apparatus of claim 6 further comprising:
a body carrying said first and second guides and having a side proximate to said outlet, said first and second guides being integral with said side of said body.
10. The meltspinning apparatus of claim 9 wherein said body includes an edge adjoining said side, said first and second guides diverging in said downward direction from said edge, and said first and second guides each including a facet proximate to said edge.