JPS6332137Y2 - - Google Patents

Description

[Detailed explanation of the idea]

The present invention relates to aligned fibers that are sufficiently superior in strength and have a high specific gravity. Traditionally, high-density yarns are produced in the monofilament manufacturing process.
High specific gravity fillers were simply mixed into the monofilament-forming resin to increase the specific gravity. That is, as a result of mixing a foreign substance called a high specific gravity filler into the resin, the high specific gravity filler acts as an aggregate, and it is inevitable that the filament itself becomes hard. Therefore, the hardness remains even after processing into rope or twine, and the higher the specific gravity, the higher the hardness, and the product quality is 30% higher than that of unfilled filament.
The drawback was that it became ~50% harder. This invention creates a high-density resin by mixing a high-density filler with a soft, non-stretchable resin that is different from the resin that makes up the main body of the monofilament. It is extruded separately using a two-layer die, and is then laminated inside the die to form a pencil lead shape. Even during the stretching process, the high specific gravity resin does not come out directly, so it can be manufactured using normal work processes. In short, it is about an excellent high specific gravity alignment fiber that has never been seen before, in which two types of resin have their respective roles: increasing the strength of the monofilament in the outer sheath and increasing the specific gravity in the core. To explain the high specific gravity aligned fibers of the present invention with reference to the drawings, as shown in FIG. A high specific gravity resin 4 in which 7 is mixed and dispersed is sealed in the core of the outer shell to form a pencil lead shape, and this pencil lead shaped monofilament is further connected by a connecting film 2.
As shown in the figure, the connecting membrane has a high specific gravity resin membrane 5 in the center, which is sandwiched in a sandwich-like manner by a thin outer resin membrane 6. As shown in FIG. 2, the number of monofilaments 1 is usually several. Furthermore, the soft resin used for the core has a property of softening or melting at the stretching temperature of the outer skin resin, and does not require stretchability. Now, as shown in FIG. 1, in the high specific gravity aligned fibers of the present invention, the high specific gravity resin part 4 encapsulated in the core of the monofilament 1 is interconnected by the thin paper-like high specific gravity resin 5 forming the core of the connecting membrane 2. This is a special structure in which the connecting membrane is connected to the membrane and is completely covered by the outer skin 3 and the outer piece 6 of the connecting membrane, and an example of its manufacturing method will be described below. The outer skin resin and the high-density resin are extruded separately by two extruders, while the die, in which the orifice forming the monofilament is communicated with a narrow slit, has two layers: the inside and outside, and the high-density resin is extruded into the inner die. When the outer dies feed the outer skin resin and allow it to run out, a pencil lead-shaped composite body with internal and external communication is obtained. Next, the composite thus obtained is stretched at a predetermined temperature suitable for the outer skin resin.
The outer skin is stretched to increase its strength, while the high specific gravity resin in the core is in a softened or molten state at the predetermined temperature, so that it can deform in accordance with the deformation of the outer skin. In other words, the outer skin becomes thinner due to stretching, but the core also stretches and becomes thinner according to the degree of stretching, and during that time they are always in close contact, and there is a gap between the outer skin and the soft resin, or between the soft resin and the high-density powder. There is no void or void in between. In this way, cored type fibers as shown in FIG. 2 are formed. Various fiber resins such as polyethylene, polypropylene, and nylon can be used as the resin for the outer skin 3. The high specific gravity resins 4 and 5 are the same, but the resin used for this has a melting point that melts at the temperature when the resin of the outer skin 3 is stretched, and is soft, even when mixed with a large amount of high specific gravity filler. Desirable materials include low-density polyethylene (abbreviated as LDPE), ethylene vinyl acetate copolymer (abbreviated as EVA), and rubber-like resins that do not become hard and have a low melting point. Examples of high-density fillers include calcium sulfate, calcium carbonate, and metal oxides. Example The physical properties of the high specific gravity yarn of the present invention, which has five strands of 600d and 3000d, specific gravity 1.46, outer skin resin is polyethylene, and core resin is LDPE, are as follows.

[Table] For comparison, an example of ordinary aligned fibers is shown below. The physical properties of 5-strand 400d, 2000d, specific gravity 096, regular polyethylene fibers are as follows.

【table】 [Brief explanation of the drawing]

Figure 1 is a cross-sectional view showing the structure of the present invention and fibers;
FIG. 2 is a perspective view of five fibers of the present invention arranged in a row. 1...Pencil lead type monofilament, 2...Connection membrane, 3...Outer skin, 4...High specific gravity soft resin, 5...
High specific gravity film, 6... Outer film, 7... High specific gravity powder.

Claims (1)

[Scope of utility model registration request] Stretched at a certain temperature to improve molecular orientation,
A plurality of high-density fiber bodies each having a resin that increases strength as an outer skin, and a core of which is filled with a high-density resin obtained by mixing and dispersing a powder of a high-density substance in a resin that softens or melts at the predetermined temperature, in the shape of a pencil lead. A high specific gravity aligned fiber, characterized in that the above-mentioned high specific gravity resin is connected with an outer resin thin film sandwiching the high specific gravity resin in the shape of a sandwich.