JPS61146862A - Production of cotton like article - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a method for producing a cotton-like material made of filaments obtained by melt-spinning a thermoplastic resin.

Prior art and its problems Synthetic cotton is used as a cushioning material for sheets, etc., or as a filler for bedding and clothing.
Synthetic cotton is usually manufactured by crimping melt-spun filaments and then opening bundles of cut filament short fibers. If only the filament is used alone, the filament will shift considerably, lack shape retention, and be easily removed.

In order to give bulkiness, the filaments are sufficiently opened and expanded; in other words, the filaments are shifted so that the crimped forms of each filament do not overlap; in other words, the filament layers that have been opened are curled. Various materials have been proposed, but they still have drawbacks such as insufficient bulkiness, unevenness, and tactility problems, and filaments that tend to shift.

Means for Solving the Problems The present inventors cooled and crimped a group of spun filaments under specific cooling conditions, then wound them into a roll and cut them with a knife. It was discovered that the fibers instantly crimped and expanded, producing a fluff-like material with extremely high bulk and finely entangled filaments.

The present invention was made based on this knowledge. After crimping a group of filaments made by melt-spinning a thermoplastic resin under specific cooling conditions, the filaments are wound onto a roll. After the amount of winding reaches an appropriate amount, a cutter is used to It is characterized by cutting with.

Here, the filament group is crimped by the method previously proposed by the applicant, that is, by applying a flow rate of 5 from the side of the filament group.
~30 m/sec, cooling air at a temperature of 20°C or less is applied at 45° above and below the cooling outlet located within 20-1 from the nozzle surface and within 20+ seconds from the filament group.
For spraying within the range, spray at an angle of 100-
(2) A method in which the filament group is completely separated and cooled and solidified while being drawn at a speed of 5 m/min or more, and then drawn in a heated air stream in a multi-stage drawing stand; in the above method, the drawing speed is A method in which the drawing process is omitted by increasing the speed to 5 Om/min or more, blowing cooling air under the above conditions from one side of the filament group, and using a highly directional heating means such as an infrared heater to disturb the air flow on the other side. This is carried out by, for example, a method in which a group of filaments is heated.

The figure shows an apparatus for producing cotton-like material used in the present invention, in which a goo body 1 is provided with a porous block nozzle 2 through which a molten thermoplastic resin is extruded to form an undrawn filament group 3. The undrawn filaments are taken up by a roller pair consisting of a take-up drive roller 5 and a take-off squeeze roller 6 at a speed of 5 m/min or more, and Surin and Doper 7 are blown onto the sides of the undrawn filament group 3. The outlet is within 20mm from filament group 3 and 20s+ from the nozzle surface.
The cooling air at a temperature of approximately 20°C or less is blown out at an angle within a range of 45° horizontally to the filament group 3 at a flow rate of 5 to 30 m/sec. The filament group is cooled and separated and solidified within 100 seconds from the nozzle surface. The undrawn filament group 3 that has passed through the pair of take-up rollers 5.6 is then drawn through a pair of rollers including a hot drawing stand 9 of a known structure provided in one or more stages, a drawing drive roller 1G, and a drawing squeeze roller 11. The crimped drawn filament group 12 is wound up on a winding roller 13. The drawn filament group 12 is taken up by the rewinding roller 1°3
After the filaments have been wound appropriately 11 times above, the roller is stopped, and the cutter 14 cuts the drawn filaments laminated in layers on the take-up reroller.

The thermoplastic resin used in the method of the present invention may be low-density polyethylene, high-density polyethylene, polypropylene, poly-1-butene, poly-4-methyl-1- bentene or ethylene,
Polyolefins such as random or block copolymers of α-olefins such as propylene, 1-butene, 4-methyl-1-pentene, ethylene/acrylic acid copolymers, ethylene/vinyl acetate copolymers, ethylene/vinyl alcohol Copolymers, ethylene/vinyl compound copolymers such as ethylene/vinyl chloride copolymers, polystyrene, acrylonitrile/styrene copolymers, ABS, methyl methacrylate/styrene copolymers, α-methylstyrene/styrene copolymers Styrenic resins, polyvinyl chloride, etc.
Polyvinylidene chloride, vinyl chloride/vinylidene chloride copolymer, polyvinyl compounds such as polymethyl acrylate, polymethyl methacrylate, nylon 6, nylon 6-6,
Any resin such as polyamide such as nylon 6-1O, nylon 11 or nylon 12, thermoplastic polyester such as polyethylene terephthalate or polybutylene terephthalate, polycarbonate, polyphenylene oxide, etc., or a mixture thereof may be used.

Among such thermoplastic resins, crystalline thermoplastic resins such as polyolefins, polyamides, and polyesters, which can be transformed into high-strength multifilaments by stretching and oriented crystallization, are preferred.

The molecular weight of the thermoplastic resin is not particularly limited as long as it can be melt-extruded into a multifilament.6 For example, in the case of polyolefin, the melt flow rate (MFR: ASTM D1238) is usually 0.
In the range of 2 to 30 g/10 m1n, if it is polyamide, it is usually concentrated sulfuric acid, and the intrinsic viscosity [η] at 25°C is 0.8 a / g or more, and if it is polyester, it is usually 0- Chlorphenol has an intrinsic viscosity [η] of 0.5 dl/g or more at 25°C.

Example 1 MFR: 13.0 g/10s+in (AST
M D 1238 L) polypropylene (trade name, Mitsui Petrochemical Polypropylene 5800 manufactured by Mitsui Petrochemical Industries) was melted in a 40 m 5 Φ extruder, and a porous nozzle block (with a hole diameter of 0 in a 10-1 φ circle) installed in a die was melted. . 4 blocks with 88 holes of 5-1Φ drilled) to Gui salt 3
The molten filament group was spun at 00°C, and the cooling conditions for the undrawn filament group were as follows: Cooling air temperature: 15°C, cooling ring cooling air blowing angle: 30° below the horizontal with respect to the filament group, cooling air outlet position: multi-hole nozzle From the same level as the block spinneret to the flow direction 51-, the distance from the cooling air outlet to the outer surface of the filament group: 51 and the speed at the cooling air outlet: l Q m/a+in, and the cooling take-up speed is 50 m/min. After spinning a completely separated group of 352 undrawn filaments, a hot air drawing tank (hot air temperature: 111i0°C, wind speed at the hot air outlet of the drawing tank = 1
0m/min, tank length: 2m), 210m/min.
Stretched at a speed of min.
-■Φ) increased to 3% of the stretching speed (216m/■in)
After winding it up on the winding roll to a width of 20 mm and a thickness of 51 mm, the roll was stopped and immediately cut at one place on the circumference with a cutter knife. The cut filament group instantly crimped, expanding its cross-sectional area by about 80 times, and shrinking in the vertical direction to about 17% of the roll's outer circumference length, resulting in a finely entangled cotton-like material. . The denier of the single yarn of the cotton-like material is
The average denier was 2.6 denier. Also, when observing the crimped state, the number of rings per 10 mm cannot be clearly measured because the threads are entangled with each other and the fineness is small. When we investigated the crimp ring, we found that there were 8 or more to 29 crimp rings, and the crimp ring was composed of many overlapping threads.

Comparative Example A test was carried out under the same conditions as in Example 1, except that the cooling air temperature was changed from 15°C to 28°C, and the distance 5-■ from the cooling air outlet to the outer surface of the filament group was changed to 30s-.

As a result, a 51-thick steel roll, laminated and wound in a 20-mist layer, was cut at one point on the circumference with a cutter knife immediately after the roll stopped, but crimp did not occur as in Example 1. However, the effect of the winding speed was only to cause contraction in the direction of the winding diameter, and the desired crimped and expanded cotton-like material could not be obtained.

Effects of the Invention According to the present invention, it is possible to obtain a cotton-like material that has extremely high bulk (and filaments are finely intertwined with each other, so that the filaments are less likely to shift), and has excellent shape retention. To escape (-)

[Brief explanation of the drawing]

The figure is a diagram schematically showing an apparatus used in the method of the present invention. 1. Gui body 2. Porous nozzle block 3. Undrawn filament group 9. Hot drawing stand 12. Stretched filament group 13. Winding reroller 14. Cutter agent Patent attorney Akira Sato - Procedural amendment Manabu Shiga, Commissioner of the Japan Patent Office Case Indication 1982 Patent Leprosy No. 264848 2 Title of the invention Method for manufacturing flocculent material 3 Relationship with the person making the amendment Case Patent applicant Chiyoda, Tokyo 100 3-2-5 Kasumigaseki-ku Mitsui Petrochemical Industries Co., Ltd. Representative Seiki Nakano 4 Agent

Claims (1)

[Claims] For filament groups made by melt-spinning thermoplastic resin, within 20 mm from the nozzle surface and 2 points from the filament group.
A flow rate of 5~ from a slit bar with an outlet within 0 mm
Spray cooling air at a rate of 30 m/sec at a temperature of 20°C or less horizontally at a blowing angle within a range of 45° up and down.
If necessary, the filament group is further heated from the opposite side using a heating means such as a highly directional heater that disturbs the air flow, and the filament group is completely separated and solidified within 100 mm from the nozzle surface at a rate of 50 m/min or more. Cotton is drawn at a speed of 5 m/min or more, stretched, crimped, wound on a winding roll, and then cut with a cutter on the winding roll. Method of manufacturing