Stretched elastic nonwovens
A technology of non-woven fabrics and elastic polymers, which is applied in the direction of non-woven fabrics, fabrics, textiles and papermaking, and can solve problems such as poor overall coverage and poor uniformity
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Examples
Embodiment V0-V13 and 1-6
[0047] A 50 gsm sheath / core ("S / C") fiber sample of 93% / 7% w / w propylene-ethylene copolymer elastomer with polyethylene sheath (ASPUN 6811A polyethylene) was prepared. These samples were biaxially stretched (both machine and transverse) at 0%, 100%, 150% and 200% on an Iwamoto stretcher at 40°C. Two of the samples were subjected to ring rolling in both directions at once, using a transverse ring roll with 0.149" engagement. Measured in the machine and cross directions using a 2-cycle, 100% elongation / recovery test on an Instron device Individual samples. All values reported here have been normalized to a 3" width x 50 gsm fabric. Permanent set is determined from the expanded Y-axis view where the baselines intersect from the second cycle contraction curve. Stress relaxation was determined from raw tensile data using 50% elongation and 1 minute hold to remove any machine compliance artifacts. The results are shown in Tables 1-4.
[0048] Microscopic, qualitative observatio...
Embodiment 7-16
[0050] The following examples are produced on a ra 2.5m production line, and then stretched in the MD or CD direction on a differential drive system (for MD stretching) or a tenter frame (for CD stretching).
[0051] The system is a series of rollers and drives capable of taking a 2.5 meter wide web and moving it through the system at different speeds in order to achieve stretching (increasing speed) or relaxation (decreasing speed). The system has 3 drive zones, each with multiple rollers and drives to control the set velocity of the web and avoid slippage. There is no way to maintain the transverse width, which can and probably will decrease during MD stretching. Drive unit and rollers can be heated.
[0052] A stenter frame is an equipment with temperature control and stretching versatility in multiple zones. Basically, there is an initial region to preheat the sample, with little or no stretch, followed by a region to stretch the sample under heat, a hold region, to furt...
Embodiment 7
[0053] The 50gsm fabric is made of 93 / 7 core / sheath bicomponent elastane based on PELLETHANE 2102 75A elastic polyurethane as the core elastomer and fiber grade polyethylene sheath, and the thermal point bonded web is It is directly fed into the CD tenter. The equilibrium temperature at the beginning was set at 80°C-90°C. The stretching and relaxation steps were carried out at temperatures of 95°C and 100°C, respectively. The web was initially 1.8 meters and ended up being 4.4 meters wide. The fabric basis weight at the end was 25 gsm. The linear density of the raw fiber was 3.9 dtex (grams per 10,000 meters or average -22 micron diameter fibers), while the CD tenter material had a reduced density of 2.14 dtex (-16.5 micron diameter).
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Abstract
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