CS215158B1 - A method for producing continuous polyester fibers suitable for hybrid forming - Google Patents

Abstract

The purpose of the invention is to prepare continuous polyester fibers for hybrid shaping from composite silks of different shrinkage, which is achieved by preparing a silk with high shrinkage by drawing a pre-oriented silk with a birefringence of 0.025 to 0.070 on a heating element-iron with a surface temperature of 20 to 100°C. A less shrinkable silk, as the second component of the fiber, has a shrinkage of 7 to 12% and is prepared by drawing on a heating element at a temperature of 20 to 80°C higher than the temperature of the heating element when drawing a higher shrinkable silk, continuously with shaping, or in a separate drawing operation before shaping the composite silk formed by both components - fibers.

Description

1 215,58

The present invention provides a method for producing starting filaments having sufficient shrinkage variations suitable for hybrid molding. f *

The hybrid molding is a new way of shaping, which is the subject of the Czechoslovak invention under the author's certificate no. In the hybrid molding, two endless filaments, which differ in their shrinkage, are inserted into the forming element, preferably into the molded article. After shaping, the fiber stabilizes, gets stuck, thus enhances the shaping effect and improves the stability of the bulk.

For a hybrid molding, the fibers used need to be sufficiently different in shrinkage. The difference in shrinkage can vary within wide limits, the shrinkage difference of 15-25 is most often chosen. The basic task at. This theology is the preparation of a two-fold polyester fiber with the required shrinkage difference, which is combined prior to forming. Conventional copolyester silk exhibits shrinkage at 150 ° C most often in the range of 7-12 µm. The viscous silk should preferably have a shrinkage of preferably 15 to 25 degrees.

The shrinkage can be increased by reducing the cut-off temperature, but in this way the necessary shrinkage cannot be achieved.

The shrinkage can be increased by copolyesterification, for example by copolyesterification with isophthalic acid. The disadvantage of this method is the higher fiber cost and the complicated technological process. ~

In the known method described in FR 1.U03-59, a two-stage extension is used. In the first stage, it is cut to 3Ο7% of the total draw ratio, the temperature is in the range of -20 ° C from the second stage to -50 ° C from the melting point. In the second stage, it is cut at a temperature of 10-100 ° C lower than in the first stage. This will allow you to prepare a thread with shrinkage of 60-70 $.

The disadvantage of this procedure is that there is a need for machinery that allows two stages to be driven. In the process of the present invention, a suitable combination of the properties of the starting fiber as well as the parameters of the spreading are used. The starting fiber must be birefringent in the range 0.025 - 0.070. Such a fiber can be made by a known spinning method at high vents, the most commonly used is spinning and spacing in the range of 2,500 - 3.5ΟΟ m / min. When cutting the sheet, a reduced ratio is used, most often in the range of 1.6 - 2.2. By selecting the appropriate temperature for the tread, both the shrinkage and the less shrinkable fibers can be made. However, the invention is not limited to the preparation of double-stranded filaments of 0.025-0.070 but only a shrinkable component is prepared from such filament and a conventional shrinkable 7-12 ový polyester polyester silk is used as the less shrinkable component which is associated with the shrinking filament prior to the forming apparatus. .

In the delineation, the ratio is adjusted to the degree of orientaia, which is characterized by a double-fold. As a rule, the ratio is chosen so as to obtain a ductility of 18-25 215158 2

Mining temperature is an essential parameter. A substantial lower temperature can be used for the double-breakage filament of 0.025-0.070, which is twofold 0.010. Even such a fiber can be cut without heating. By using a sufficiently high temperature, it is possible to prepare the fiber with shrinkage and 10 ¢. EXAMPLES EXAMPLE 6.1

A pre-oriented double-stranded filament of 0.040 was used and prepared at a speed of 3,000 m / t. Fiber low titer 190 dtex, give fibers j6. Two such filaments led together on the galet feed and the second flue galet was pulled together. Two galvanic hammers were set between the galets, each set to the desired temperature. Each of the two fibers was fed to a single heating mandrel. At the cut, the temperatures varied around the mandrel to determine the shrinkage of the cut fiber, and for each test each fiber was separately removed. The split fiber passed into the forming element. Depending on the length of the temperatures, the following results were obtained: Beam ratio: 1.8 1.8 1.8 1.8 Darkness 6.1 / ° C /: 20 70 80 90 Freezing at 150 ° C / $ /: 40.1 36 , 5 30.5 23.1 Darkness 6.2 / ° C /: 100 110 130 150 Freeze at 150 ° C / $ /: 15.1 14.1 8.9 8.3 Difference in shrinkage / # /: 25, 0 22.4 21.6 14.8 Length ratio: 1.7 1.7 1.7 Darkness 6.1 / ° C /: 20 80 100 Freeze at 150 ° C / # /: 58.6 48.3 24.5 Darkness 6.2 / ° C /: 100 100 150 Freeze at 150 ° C /% /: 24.5 24.5 8.4 Difference in shrinkage / $ /: 34.1 23.8 16.1 Example 6.2

The fiber as in Example 6.1 was separate between the galet's halls, the heater was placed between the galets. A ratio of 1.9 was used. The temperature of the darkness was changing.

Triia temperature / ° C /: 20

Fiber shrinkage at 150 ° C /% / 40.3 70 36.1 80 30.2 90 23.1

Claims (1)

3 215158 In this way, and preparing the fiber, and by resilient shrinkage, this was fed to the molding machine as a shrinking component into a molding element, with 84 dtex, f 36 prepared by classical theology being drawn up by the indented fiber prior to the molding element. The double-layered polyester silk had a shrinkage of 8.7% and served as a less aggressive component. DISCLOSURE OF THE INVENTION A process for producing a blendable polyester fiber suitable for hybrid molded silk fabrics of differing degrees of fatigue, characterized in that the higher soft silk is adhered to by drawing a pre-oriented silk with a birefringence of 0.025 to 0.070 on a heating element heated to 20-100 ° C and less soft silk, with a yield of 7 to 12%, are prepared by drawing on a heating element heated to a temperature of 20 to 80 ° C higher than the temperature of the heating element while the higher silk is in operation, continuing with the forming operation or in a sham the operation of drawing before forming the silk. SeverognfU 'n .odod 7 «Mort