Spun-bonded non-woven commonly used three kinds of drafting the uncensored!
Spun-bonded non-woven fiber is adopt the way of air draft drawing, with the application of drafting mechanism is different, the specific way of drawing also owing to the different models.
In spun-bonded law system, common way of drawing the main has wide slot suction type (
Drafting, width slit barotropic draft three drafting, round pipe.
A, spun-bonded non-woven fabric width slit suction type (
Draft width slit suction type (
Draft is characteristic of the close spinning draft channel, airflow into the net, drafting of positive pressure air and cooling airflow close 2 for one, with a suction wind device net machine to produce the negative pressure to accelerate air flow, realize the drafting of the fiber.
As the channel of the draft basic shapes for the large under small tapered shape, accelerated airflow within the channel, the drafting of the fiber.
Wide slot suction type drafting process is a kind of technology very widely used in the world.
Second, spun-bonded non-woven fabric width slit drafting of positive pressure width slit barotropic drafting use open-end spinning drafting channel, air flow (
Some models using static points)
Into the net, using monolithic independent drafting device, draft with positive pressure air as a driving force, spinning channel open to all.
And cooling air flow is basically no drawing function, the use of compressed air (general
Pressure generally within 1 mpa)
The draft of the fiber.
According to the actual operation situation, width slit barotropic drafting device has high drawing speed and good feedstock adaptability, but as a result of drafting assembly exports high air velocity, increased the difficulty of the control web uniformity.
Three, spun-bonded non-woven tube draft tube drawing process is often referred to as 'draft tube type', use open-end spinning drafting channel, machinery (
Such as pendulum type)
Silk, into a network, the use of numerous independent circle tubular (
Diameter of about 8 to 16 mm, length up to several meters)
Drafting device, the use of positive pressure air as draft force.
Draft air (
After entering drafting device of annular space, down from the diversion cavity injection draft tube, from the bottom.
High-speed airflow in tow entrance negative pressure, and the silk bundle and air suction tube, tow air flow in channel clamping speed and the draft.
In tubular drafting system, fiber drawing speed can reach 3000 ~ 5000 m/min, and thus can be applied to PP spinning system, also can have high drawing speed on the PET spinning system.
The circular tube drawing system can achieve high drawing speed, wire speed can reach 5000 ~ 7000 m/min, drawing effect is ideal, fiber drawing more fully, also is the present domestic for main technology of spun-bonded non-woven fabric production.
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