Nonwoven fibrous material (versions)

FIELD: textile industry, in particular, versions of nonwoven fibrous material made in the form of needle stitched web.

SUBSTANCE: material is manufactured from mixture of high-melting point and various low-melting point fibers, with main fiber being two-component polyester fiber of "core-coat" type. Polymer of "coat" has melting temperature substantially lower than polymer of "core". According to first version, low-melting point fiber used is staple two-component polyester fiber of "core-coat" type having thickness of 0.4-1.0 tex, length of 50-90 mm and melting temperature of "coat" polymer of 105-115 C. High-melting point fiber is staple polyester fiber having thickness of 0.3-1.7 tex, length of 60-90 mm and melting temperature of 240-260 C. Ratio of fibers in mixture, wt%, is: staple two-component polyester fiber of "core-coat" type 30-70; staple polyester fiber the balance to 100. According to second version, nonwoven fabric additionally comprises auxiliary staple polypropylene fiber having thickness of 0.6-1.7 tex, length of 50-90 mm and melting temperature of 150-160 C. Ratio of fibers in mixture is, wt%: staple two-component polyester fiber of "core-coat" type 30-70; staple polypropylene fiber 5-20; staple polyester fiber the balance to 100.

EFFECT: improved operating properties and form stability of parts manufactured from nonwoven fibrous material under conditions of changing temperature loadings.

3 cl, 1 tbl, 5 ex

 

The technical field to which the invention relates.

The invention relates to nonwoven fibrous material from a mixture of synthetic thermoplastic fibers. The invention can be used in the production of articles of complex configuration, for example in the manufacture of facing tselnoformovannye interior parts of vehicles (upholstery ceilings, upholstery, walls, doors and other).

The level of technology

Known nonwoven fibrous material consisting of a mixture of thermoplastic fibers - polyester, polyamide or polyvinyl chloride infusible fibers and natural fibers - wool or sphagnum moss [Patent RU 2118416, D 04 H 1/46, 27.08.1998]. Polyester fiber is 5-40 wt.%, polyamide or polyvinyl chloride fiber is 5 to 30 wt.%, wool fiber is 1-20 wt.%, the rest of sphagnum moss.

The disadvantage of non-woven material - low sound absorption capability.

Known non-woven fibrous material, consisting of interconnected hypoproteinemia fibrous layers containing polyester fibers. Nonwoven fibrous material contains polyester fibres and with a linear density of 0.33-0.44 Tex, cutting length not less 65-90 mm not less than 50% of the mass of material [Patent RU 2215836 "Nonwoven fibrous material", D 04 H 01/46, published. 2003.11.10].

The closest the present invention according to the most similar essential features is a non-woven fibrous material for Shoe insoles, described in the patent of Russian Federation (RU 2220241, D 04 H 1/54, 27.12.2003). Non-woven material bonded hypoproteinemia made of fibrous mixture comprising bicomponent Poliarnie fiber type core-shell polymer shell which has a melting point substantially lower than that of the polymer core, 25-40 wt.% absorbent fibers 90-100% representing flax fibres and polypropylene or polyamide fibers in the amount of 30-55 wt.%. The content of bicomponent polyester fibers of type "core-shell" is 20-30 wt.%. The material is further fusion bonded polymer "shell" polyester bicomponent fibers, and the surface density of the material is in the range 550-750 g/m2.

A disadvantage of the known composition of non-woven material - low dimensional stability obtained their bulk products and unacceptably low reverberation of sound absorption in the frequency range 1-8 MHz.

The invention

The technical problem on which this invention is directed, is obtaining a nonwoven fabric with high performance properties: thermal insulation and noise in the frequency range 1-8 MHz, while providing the necessary shape of the parts in operation under the action of the alternating temperature the x loads.

The problem is solved in that the nonwoven fibrous material, which is a needle-punched fabric made of a mixture of refractory and various fusible fibers, the core of which is a bicomponent polyester fiber type core-shell polymer shell which has a melting temperature substantially lower than the polymer core, according to the invention, as fusible fibers used staple bicomponent polyester fiber type core-shell thickness of 0.4÷1.0 dtex and a length of 50÷90 mm with a melting point polymer "shell" 105÷115°or a mixture of polypropylene staple fiber thickness of 0.6÷1.7 dtex and a length of 50÷90 mm with a melting point of 150÷160°With staple bicomponent polyester fiber type core-shell thickness of 0.4÷1.0 dtex and a length of 50÷90 mm with a melting point polymer "shell" 105÷115°and as refractory fibers used polyester staple fiber thickness 0,3÷1.7 dtex and a length of 60÷90 mm, melting point 240÷260°C.

The ratio of fibers in the mixture is (wt.%):

staple bicomponent polyester fiber
type "core-shell" 30÷70
staple polypropylene fiber0÷20
staple polyester fiberthe rest is up to 100

Polypropylene or polyester fiber, part of the non-woven material may further contain carbon black in the amount of 3-10 wt.%.

The dimensional stability of the product design of the proposed non-woven material is provided by using the above-mentioned fusible fibers, which are in the process of heating and molding melt and sew (fasten) composite material.

High homopolyamide properties of the products of the proposed non-woven material provides a polyester fiber, which does not melt in the process of thermoforming and keeps the air gaps in the structure of the composite material is optimal (from the point of view of noise absorption in the range of the above frequencies) size and configuration.

The technical problem can be solved by the simultaneous fulfillment of all conditions of certain essential features of the proposal. When included in the composition of the nonwoven staple fibers smaller thickness and length of the reduced dimensional stability of large volumetric frame products derived from non-woven material by extrusion method. When SOS is AB nonwoven staple fibers greater thickness and length of the reduced sound absorption in the frequency range of the noise of motor vehicles.

When the nonwoven fabric composition polyester staple fiber type core-shell" fiber melting temperature "shell" less than 105°and polypropylene fibers with a melting point less than 150°With reduced coefficient of thermal protection products from non-woven material.

When the nonwoven fabric composition polyester staple fiber type core-shell" fiber melting temperature "shell" over 115°and polypropylene fibers with a melting point of more than 160°deteriorates the formability of the large volume of frame products derived from non-woven material.

By reducing the content in non-woven staple bicomponent polyester fiber type core-shell" less than 30 wt.% deteriorates the formability of the material.

With the increasing content in non-woven staple bicomponent polyester fiber type core-shell" more than 70 wt.% while maintaining the basic properties increases the cost of the material.

By reducing the content in non-woven polypropylene staple fibers less than 5 wt.%. deteriorating the dimensional stability of the products.

With the increasing content of non-woven material of polypropylene staple fiber for more than 20 wt.% worse noise characteristics of the products.

Thus the use of staple polypropylene fibers within a 5÷20 wt.% allows you to achieve positive results. The result is maximum when using staple polypropylene fibers within 10÷15 wt.%.

The positive effect of use is also observed in the absence of staple polypropylene fibers in the mixture of fibers, but using as a low-melting fiber staple bicomponent polyester fiber type core-shell" with the stated characteristics.

Information confirming the possibility of carrying out the invention

Example 1. Nonwoven material intended for receipt by the method of timepressure large decorative elements of the interior of vehicles consists of a mixture of staple fibers of the following composition (wt.%):

two-layer bicomponent fusible polyester fiber - 50;

polypropylene fiber (black) - 10;

polyester fiber - 40.

The length and thickness of the staple fibers is:

two-layer bicomponent fusible polyester fiber - 51 mm/0.44 Tex;

polypropylene fiber - 66 mm/0,68 Tex;

polyester fiber - 66 mm/0.33 Tex.

Polypropylene fiber is painted in black color. Mass fraction of carbon in the fiber 5 wt.%.

the Formation and bond patterns decorative paintings carry on the needle Assembly. Surface density (bulk) 1000÷1200 g/m2. The density of the perforation - 100 cm-1the depth of the perforation fibrous canvas 8 mm

From a cloth ready nonwoven material cut samples - billet for extrusion.

Pressed from the material composition of example 1 bulky items placed in the template with the specified dimensions and shape. Check the stability of the shape and dimensions immediately after molding and cooling. Deviations in dimensions and maximum deviations from the form template are entered in the table 1.

Example 2. Nonwoven material intended for receipt by the method of timepressure large decorative elements of the interior of vehicles consists of a mixture of staple fibers of the following composition (wt.%):

two-layer bicomponent fusible polyester fiber - 50;

polyester fiber(black) - 35;

polypropylene fiber(white) - 15.

The length and thickness of the staple fibers is:

two-layer bicomponent fusible polyester fiber - 51 mm/0,ax;

polyester fiber - 66 mm/0.33 Tex;

polypropylene fiber - 66 mm/0,68 Tex.

Part polyester fiber dyed in black color. Mass fraction of carbon in the fiber 5 wt.%.

Pressed from the material composition according to example 2 major is sstable products are placed in the template, having specified dimensions and shape. Check the stability of the shape and dimensions immediately after molding and cooling. Deviations in dimensions and maximum deviations from the form template are entered in the table 1.

Examples 3-5. Nonwoven material intended for receipt by the method of timepressure large decorative elements of the interior of vehicles, consists of a mixture of staple fibers of the following composition (wt.%):

two-layer bicomponent fusible polyester

fiber - 30÷70;

polyester fiber(white) - 20÷60;

polyester fiber(black) - 10÷15.

The length and thickness of the staple fibers is:

two-layer bicomponent fusible polyester fiber - 51 mm/0.44 Tex;

polyester fiber - 66 mm/0,33÷1.7 Tex.

Part polyester fiber dyed in black color. Mass fraction of carbon in the fiber 5 wt.%.

Pressed from the material composition according to examples 3-5 bulky items placed in the template with the specified dimensions and shape. Check the stability of the shape and dimensions immediately after molding and cooling. Deviations in dimensions and maximum deviations from the form template are entered in the table 1.

For comparison were tested in similar conditions known non-woven material, the floor is obtained according to the patent of Russian Federation (RU 2220241, D 04 H 1/54, 27.12.2003).

Table 1.
IndicatorsThe number of the sample (sample)
Known material12345
The composition, %
Bicomponent polyester fiber5050503070
Polyester fiber4035 (black)35 (white) 15 (black)60 (white) 10 (black)20 (white) 10 (black)
Polypropylene fiber10 (black)15 (white)--
Weight, g/m1010±101100-12001100-12001100-12001100-12001100-1200
The test result. Deviation from the form mm721323
The deflection, the m (120° C - 1 hour)150491510013097
The heat (95°M - 6 hours) are not allowed to change the appearance of++++++
Resistance to alternating temperature loads:++++++
Reverberation ratiofactfactfactfactfactfact
sound absorption. Frequency(required):
500 Hz = 30%363536373344
1000 Hz = 60%476060606161
2000 Hz = 80%518382848472
4000 Hz = 90%5610810810910989
8000 Hz = 100%6518 11711811898
Result-++++±
Coefficient of thermal conductivity, kcal/m.ch °0,0350,031to 0.032to 0.0320,0310,031

Sources of information

1. Patent of the Russian Federation - RU 2118416 "Nonwoven fibrous material", IPC D 04 H 01/46, (published. 2004).

2. Patent of the Russian Federation - RU 1805152, "Nonwoven fibrous material", IPC D 04 H 13/00, (published. 1991)

3. Patent of the Russian Federation - RU 2215836 "Nonwoven fibrous material", IPC D 04 H 01/46, published. 2003.11.10.

4. Patent of the Russian Federation - RU 2220241, D 04 H 1/54, 27.12.2003, "Nonwoven material", (published. 2003.06.27) prototype.

1. Non-woven fibrous material, which is a needle-punched fabric made of a mixture of refractory and various fusible fibers, the core of which is a bicomponent polyester fiber type core-shell polymer "shell" which has a melting temperature substantially lower than the polymer core, wherein as the fusible fibers used staple bicomponent polyester fiber type core-shell thickness of 0.4÷1.0 dtex and a length of 50÷90 mm with a melting point polymer "shell" 105÷115°and the quality is TBE refractory fibers used polyester staple fiber thickness of 0.3÷ 1.7 dtex and a length of 60÷90 mm, melting point 240÷260°ratio of fibers in the mixture is, wt.%:

Staple bicomponent polyester
fiber type core-shell"30÷70
Staple polyester fiberThe rest is up to 100

2. Non-woven fibrous material, which is a needle-punched fabric made of a mixture of refractory and various fusible fibers, the core of which is a bicomponent polyester fiber type core-shell polymer shell which has a melting temperature substantially lower than the polymer core, and auxiliary polypropylene fiber, characterized in that as the main fusible fibers used staple bicomponent polyester fiber type core-shell thickness of 0.4÷1.0 dtex and a length of 50÷90 mm with a melting point polymer "shell" 105÷115°With, as an auxiliary fusible fibers used low-melting polypropylene staple fiber thickness of 0.6÷1.7 dtex and a length of 50÷90 mm with a melting point of 150÷160°and as refractory fibers used staple poliefirketonov thickness of 0.3÷ 1.7 dtex and a length of 60÷90 mm, melting point 240÷260°ratio of fibers in the mixture is, wt.%:

Staple bicomponent polyester
fiber type core-shell"30÷70
Staple polypropylene fiber5÷20
Staple polyester fiberThe rest is up to 100



 

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