JPS5930825B2 - Method for manufacturing heat-sealable fiber sheet - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a heat-adhesive fine-grained short fiber group formed from a melt of a high molecular weight polymer or a copolymer to form a layer or a covering layer on the surface of a breathable fiber sheet. The present invention relates to a method for producing a heat-sealable fiber sheet for fixing or adhering.

Recently, demand for clothing fabrics has increased from the viewpoints of comfort, silhouette, and luxury goods, and as a result, fibers with finer fineness are being used, and woven fabrics are also shifting to lighter, thinner fabrics.

Therefore, there has been a demand for an adhesive interlining that is flexible, lightweight, and does not lose its shape to sewn products. The interlining used in this adhesive interlining is manufactured by spinning a molten high polymer into continuous filaments, which are then deposited on the fiber sheet in a spider-like shape while they are sticky. However, this manufacturing method involves drawing melt-extruded filaments into continuous filaments using undisturbed parallel airflow, and the spider-like particles of the continuous filaments collected on the fiber sheet can be uniformly dispersed. The filament has a relatively large fineness, and in order to reduce the fineness, the speed of the gas flow or the resin melting temperature has to be reduced. Due to the characteristics of the molten resin, it tends to break during drawing. Continuous and stable spinning was difficult due to limitations. Furthermore, with the above-mentioned spider web interlining material, for thin fabrics with a basis weight of 100y/771" or less, the resin oozes onto the fabric surface during adhesion, making it unsatisfactory. The present invention was developed in view of the above-mentioned drawbacks, and eliminates the above-mentioned drawbacks by melting and adhering at the lowest possible temperature and slight pressure during sewing processing, so that the entire adhesive constituent fiber contributes to adhesion without waste. The present invention provides a method for producing a breathable interlining having a thin layer of fine heat-sealable short fibers on the surface layer without resin oozing. The fibers are extruded through a number of adjacent spinning nozzles lined up in a straight line, and a high-velocity gas stream is blown through the gas jet holes placed on both sides of each spinning nozzle to spin a group of short fibers with fine fineness that can be heat-fused. In doing so, the tips of the spinning holes constituting the spinneret are positioned on the left and right sides of the spinning holes, and the tips of the spinning holes are positioned at an angle of about 30 to 60 degrees.
~7n is formed to protrude, and the gas flow injected from the gas jet hole is a distance of 1 to 10n directly below the tip of the center of the spinning hole (
12) The extruded melt is caught in the turbulent region by the spinneret configured to intersect with each other in the turbulence zone, and the short fibers are scattered downward. The present invention provides a method for producing a heat-sealable fiber sheet, which is characterized in that the fiber sheet is adhered in a thin layer onto an air-permeable fiber sheet fed out from a sheet. Next, the present invention will be explained according to the drawings.

FIG. 1 shows a perspective view of an apparatus for producing a heat-fusible fiber sheet according to an embodiment of the present invention. The polymer or copolymer is melted in an extruder 2, passes through a conduit 3, enters a spinneret 4 with a built-in heater, and is extruded from a spinning nozzle 5 at a constant pressure. The temperature is maintained at 20 to 50 degrees C higher than the melting point. Ru.

Each spinning nozzle 5 has a diameter of 0.1 to 0.5 as shown in FIG.
A large number of n holes are arranged in a line at regular intervals of 2 to 10 n adjacent to each other, and independent holes or slits of a constant width are provided as gas flow jetting holes 6 at symmetrical positions on both left and right sides. As shown in FIGS. 3 and 4, the details of the spinning nozzle are such that its tip C protrudes 13 independently or continuously from each gas jet hole 6 with a dimension 11 of 1 to 7 nm, and the gas jets are formed on both sides. The hole 6 usually has a diameter of 0.1 to 0.5 mm, and straight lines D and d' drawn downward from the spout hole on the same extension line intersect at a distance 12 of 1 to 10 nm directly below the tip C of the spinning nozzle. It is arranged at a constant angle θ so that it looks like X. The arrangement angle θ of the gas flow jetting holes 6 is set within a range of about 30 to 60 degrees in view of the uniform dispersion and spread of the spun short fibers. The heat-fusible polymer or copolymer resin discharged from the spinning nozzle having such a structure is a modified polyolefin resin,
(Modified polyester resin) An appropriate one of modified products such as acrylic, epoxy, polyvinyl alcohol resin, copolymer, polyamide copolymer resin, etc. is used.

A gas flow adjusted to below 300 degrees Celsius such as air, steam, nitrogen gas, etc. supplied from the gas flow inlet 7 flows through the pair of left and right jets.
It is injected from the outlet hole 6, intersects within the tip 101 of the spinning nozzle to form a turbulent region, and at the same time captures and fragments the extruded melt, forming a large number of fine short fibers 8 with an average fiber diameter of 2 to 12μ, and flows downward. The dispersed fine-grained short fibers are sticky and uniformly spread onto an air-permeable fiber sheet 9 that is fed out from one end of a porous conveyor 11 that incorporates a suction pipe 12 provided below and a suction device 10. A heat-sealable interlining fiber sheet material is formed by stacking thin layers and adhering them together. The above-mentioned breathable fiber sheets include plain-woven cotton cores, wool cores, hemp cores, etc. with a basis weight of 100 to 200y/771', or flexible, elastic fiber sheets with a parallel or random fiber arrangement having a basis weight of 15 to 150y/7rI. A repellent nonwoven fabric is used. Next, one embodiment of the present invention will be described.

Example A nylon copolymer resin (melting point: 110 degrees Celsius) is melted as a spinning raw material in an extruder and introduced into a spinneret.

The temperature of the spinneret is maintained at 130 degrees C, and the diameter of the spinning nozzle is 0.
．． 100 holes of 4nf are lined up in a straight line at 10n intervals, and on both sides of the spinning hole, a pair of gas flow jetting holes with a diameter of 0.3mm are arranged, 100 on each side. Distance to the intersection on the flow jet hole extension line 125
n, distance from the gas flow jet hole to the tip of the spinning nozzle 115
n, and the temperature from the gas flow nozzle is 160 degrees C.
Hot air with a pressure of K9/Cd blows out to form a turbulent region directly below the spinning nozzle, catching the melt extruded from the spinning nozzle and scattering it downward to form a group of fine short fibers with a thickness of 2 to 12 μm,
3[m/Wn! 550n below the spinning nozzle! A sheet of 50% Tetoron and 50% rayon with a basis weight of 20 is delivered from one end of a steel conveyor with a built-in suction device that runs at a speed of t.
Fabric weight: 30V/wl, thickness: 0.2, formed on a Y/A mixed fiber web using an acrylic acid ester copolymer as a binder.
heat-fusible interlining fibers having a product weight of 50 y/wl and having a heat-fusible short fiber thin layer having a covering layer weight of 20 V/m'', uniformly accumulated and adhered on a non-woven fabric of u. A sheet material was formed.Such a product can be laminated together with clothing fabric and easily bonded and pressed by ironing.
The adhesive strength is so excellent that it breaks from the nonwoven fabric portion. As mentioned above, according to the present invention, the thickness is 2 to 12 μm.
Because a uniform thin layer of heat-fusible fine-grained short fibers is obtained on the fiber sheet, the number of fibers per single area is large and the distribution is uniform, resulting in heat-fusible clothing in which all fibers effectively contribute to adhesive strength. A shape-retaining interlining is obtained.

When laminated with thin fabrics with a basis weight of 100 y/m or less or fabrics made of fine yarn, there is no resin oozing and the texture of the fabric is not affected. Pressure is applied with an iron or adhesive press. The heating time can be shortened, and compared to the filament spinning method, it has excellent effects such as continuous and stable operation.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a heat-sealable fiber sheet manufacturing apparatus according to an embodiment of the present invention, FIG. 2 is a partially cutaway plan view showing a spinning nozzle portion of a spinneret, and FIG. A partially cutaway side view, and FIG. 4 is an enlarged sectional view of essential parts of the spinning nozzle and gas flow jetting holes. 1...Hopper, 2......Extruder, 3...Conduit, 4...Spinneret, 5
...Spinning nozzle, 6...Gas flow jet hole, 7...Gas flow inlet, 8...Fine fineness short fiber, 9... ...Breathable fiber sheet, 10...
... Suction device, 11... Porous conveyor,
12... Suction duct.

Claims (1)

[Claims] 1. A melt of a high molecular weight polymer or a copolymer is extruded through a number of adjacent spinning nozzles arranged in a straight line, and a gas is extruded at a high velocity through gas flow jetting holes arranged on both sides of each spinning nozzle. In order to spin fine short fibers that can be thermally fused by blowing a stream, the tips of the spinning holes constituting the spinneret are positioned on the left and right sides of the spinning holes at an angle of about 30 to 60 degrees. A spinneret formed to protrude 1 to 7 mm from the set gas flow jet hole, and configured so that the gas flow jetted from the gas flow jet hole intersects at a distance (12) of 1 to 10 mm directly below the tip of the center of the spinning hole. The extruded melt is caught in the turbulent zone, fragmented, and the short fibers scattered downward are deposited in a thin layer on a breathable fiber sheet that is fed out from one end of a collection porous conveyor with a built-in suction device. A method for producing a heat-sealable fiber sheet, characterized by adhering the fiber sheet. 2. A breathable fiber sheet with randomly or parallelly arranged fiber webs whose main constituent fibers are natural, synthetic fibers, or mixtures thereof weighing 15 to 150 g/m^2, and synthetic rubber or synthetic resin as the main binder. A method for producing a heat-sealable fiber sheet according to claim 1, characterized in that a breathable nonwoven fabric is used. 3. Breathable fiber sheet with a basis weight of 100 to 200 g/m^2
A method for producing a heat-sealable fiber sheet according to claim 1, characterized in that a woven core such as a plain-woven cotton core, a wool core, or a hemp core is used.