At present, the domestic bi-component fiber field mainly uses composite staple fiber hot emulsification or hot air process to produce nonwovens. Among them, ES ultra-short fibers of 3, 4, and 5 mm have been favored by the market, and their products are better than single-component fibers. It has softer hand feeling, higher strength, greater extension, and good air permeability. It is the raw material for the production of surface non-woven fabrics for hygiene products. At present, ES staple fiber is a high-tech product, and its application market is on the rise. Let's learn about the ES staple fiber production process today.
There are currently two main production methods for ES staple fiber non-woven fabrics: hot air production line and hot rolling production line. The hot air method is the two-step method to produce non-woven fabrics. The non-woven fabric has the characteristics of high bulkiness, good elasticity, soft touch, strong warmth retention, good air permeability and water permeability, but its strength is low and it is easy to deform. Hot rolling production line, that is, one-step production of ES fiber non-woven fabrics. In terms of product quality, the product quality of the two-step method is better than that of the one-step method. The processing equipment for the production of ES staple fiber by the two-stage method is not much different from that of the current conventional staple fiber, mainly in the choice of output.
Two-step production process
Pre-spinning process:
The spinning temperature is determined according to the MFR of the two raw materials. If the MfR ratio of PE and PP is close to 1.0, the fiber cross section is skin-core type. If the MfR ratio is greater than 1.5, the fiber cross section is partial skin-core type, which is generally spinning The temperature of the box is 250 ~ 270 ℃, the humidity of side blowing is 85% ± 5%, the temperature of side blowing is (20 ± 2) and the speed of side blowing is 1.0 ~ 1.6m/s.
The two-component ratio is generally 50:50, and it can be adjusted according to performance requirements. The ratio between PE and PP can be from 30:70 to 70:30
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