Die for extrusion moulding of pad for optical fiber cable and manufacture method thereof
An optical fiber cable and extrusion forming technology, applied in the direction of fiber mechanical structure, etc., can solve the problems of increased cost, no inspiration, no record of surface smoothness, etc., and achieve the effect of reducing manufacturing cost and suppressing the rise of back pressure
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Embodiment 1
[0133] have figure 2 The plane shape shown and image 3 Opening section 10 is shown, having Figure 4 Protrusions shown, groove forming parting faces, partially constraining parting faces, Figure 5 The ribs shown form the parting face, and the dies shown in Table 1 for the groove forming dies were used to extrude a gasket with six rectangular shaped grooves.
[0134] (Manufacture of coated tensile wire and extrusion of gasket)
[0135] To the steel wire of 2.3mmφ, extrusion has MI and is that the anhydrous maleic acid-modified polyethylene (Japanese Yunika one system: GA006) and MI are the low-density direct-molded polyethylene of 1.3g / 10 minutes. Chain polyethylene (LLDPE: produced by Japan's Yunika, trade name: NUG5350), was coated with two layers to obtain a pre-coated tensile wire 3 with an outer diameter of 4.75 mm.
[0136] Next, the above-mentioned pre-coated tensile yarn 3 is continuously supplied on the production line in this state, and the length of the groove...
Embodiment 2
[0139]Using the same mold as in Example 1, while rotating the mold at 20.0 rpm, the same pre-coated steel wire 3 as in Example 1 was introduced into the above-mentioned mold at a linear speed of 10 m / min. Extrude and coat with the same resin and temperature to obtain six helical storage grooves twisted at a pitch Z of 500 mm relative to the length direction, with an outer diameter of 8.2 mm, a groove width of 1.45 mm, and a groove depth of 1.5 mm. Gaskets for optical fiber cables with generally rectangular grooves. The transit time of the partially constrained parting face at this time is 0.018 seconds. In addition, when the surface roughness was measured in the same manner as in Example 1, the maximum value of Ra was 0.85 μm at the groove bottom and 1.55 μm at the groove side, and the maximum value of Rmax was 6.35 μm at the groove bottom and 1.55 μm at the groove side. 9.65 μm, fully satisfying the performance as a spacer for optical fiber cables.
Embodiment 3
[0141] Prepare the pre-coated tensile yarn 3 in the same manner as in Example 1, and continuously rotate the mold 100 with the length of the groove-forming parting surface 22 of 6.35 mm and the length of the part-constraining parting surface 23 of 6 mm at 10.0 rpm. , introduce the pre-coated steel wire 3 into the above-mentioned mold at a linear speed of 5 m / min, perform extrusion coating in the same manner as in Example 1, and obtain six helical housings with a pitch Z twisted at a distance of 500 mm relative to the longitudinal direction. The groove has an outer diameter of 8.2 mm, a groove width of 1.45 mm, and a groove depth of 1.5 mm, and is a gasket for an optical fiber cable formed into a substantially rectangular groove. The transit time of the partially constrained parting face at this time is 0.072 seconds.
[0142] When the surface roughness of the spacer storage groove obtained was measured, the maximum value of Ra was 0.55 μm at the bottom of the groove and 1.26 μ...
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