Polymer articles, and methods and dies for making the same
A technology of polymer and polymer film, applied to polymer products and moulds. , to manufacture the field of polymer products, able to solve problems such as less successful
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Embodiment approach
[0142] 1. A method comprising:
[0143] - extruding the polymer in melt or solution through a spinneret to form a plurality of polymer fibers exiting the spinneret,
[0144] The spinneret has a plurality of holes having inlets for receiving polymer melt or polymer solution and outlets for dispensing polymer melt or polymer solution in fiber form; and
[0145] - directing the polymer fiber through an opening while still in the melt or solution to form a polymer film (or other article, such as a tube or rod) exiting the outlet of the opening, wherein the outlet of the opening has a surface area corresponding to The following formula:
[0146] SA2
[0147] in
[0148] SA represents the surface area of the outlet of the opening;
[0149] N represents the number of hole outlets of the spinneret; and
[0150] D represents the diameter of the hole outlet of the spinneret.
[0151] 2. The method according to embodiment 1, wherein SA2 .
[0152] 3. The method according to any ...
Embodiment 1
[0342] The material used is Vectra TM A950. Tapes were produced by continuous extrusion at 300°C using a single-screw extruder equipped with a self-made die similar to that of Fig. Part of the spinneret, the hole has an inlet and an outlet each having a diameter of 0.1 mm (to be substantially the same as Figure 4 The holes in the spinneret section in ® are arranged in a similar manner, but on a length of 120 mm instead of 17 mm)). Various extrusion speeds in the range of 10-60 rpm were used. The tape was collected on a winder (DACA Instruments, Santa Barbara, USA). Use various winding forces, up to a winding speed of 250m / min. Although the tape is not produced uniformly, eg contains cavities and / or has a considerable thickness variation across its width.
Embodiment 2
[0344] The experiment of Example 1 was repeated, but now using a reduced slit width outlet of 0.07mm (and a smaller variation in winding speed, ie maximum winding speed below 125m / min). Transparent tapes of good quality were produced, including tapes with a tensile modulus of 59 GPa in the stretch direction.
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