A melt-blown composite feather and/or down wadding, its producing method and equipment

Abstract: The present invention relate to a melt blown composite feather and/or down wadding and its producing method and equipment. The problem of forming, fixing, sewing and cutting out the feather and/or down material is successfully solved. By application of the invention, the feather and/or down characteristics of thermal insulation, softness and tensile strength are much improved. The invention belongs to melt blown nonwovens field. The main idea of the present invention is described as the following. The molten polymer is extruded and blown out of the die heads by high-velocity hot air to form two or more layers of melt blown fiber webs. The webs tend to extend to join together and a certain angle β exists between the extending directions of the webs. In the same time, the pre-equalized feather and/or down is blown out of down slot jet positioned between the die heads in the laminated state and sandwiched and wrapped by the melt blown fiber webs. Said fiber webs and said feather and/or down blown out of the feather and/or down slot jet twine and stick together randomly and they are condensed, and collected on the receiving device to form the melt blown composite feather and/or down madding.

Description: INTRODUCTION The present invention relates to the melt-blown nonwovens field and, particularly to a melt-blown composite feather and/or down wadding (MBCFDW), its producing method and its producing equipment. BACKGROUND OF THE INVENTION In the prior art, as a kind of thermal insulation material, natural feather and/or down have the disadvantages of looseness and are easily leaked, and very difficult to be formed to desired shapes, resulting in the forming method being limited to such process that the surface materials have to be sewed in grids with feather and/or down in. Thus, the feather can not fully reflect its advantages of thermal insulation, lightness and softness, and it is difficult to be used in fashionable dress. So much effort has been made to modify the surface materials, but no breakthrough occurs yet in this area. Up to now, there is no method to process the feather and/or down to product which is easy to form and cut into a desired shape. The object of the present invention is to provide a material(MBCFDW), its producing method and equipment by which the feather and/or down and the molten polymer are blown out simultaneously to form the composite wadding directly in the melt-blown nonwoven process. SUMMARY OF THE INVENTION According to the present invention, the feather and/or down and the molten polymer are blown out simultaneously to form the MBCFDW directly. The object of the present invention is realized by the following method and equipment. According to first aspect of the invention, a producing method for the melt-blown composite feather and/or down wadding is provided and comprises following steps. a kind of or kinds of polymer are molten, extruded and blown out to form two or more layers of melt-blown fiber webs by melt-blown process; said webs tend to extend to join together, and an angle β exists between the extending directions of said webs; in the meantime, the pre-equalized feather and/or down is transported by the air flow to the feather and/or down slot jet and blown out in a laminated state and is sandwiched and wrapped between the fiber webs, said feather and/or down and said fiber webs twine, stick and mix together randomly and are condensed and formed on the receiving device successively and directly. Preferably, said melt-blown angle β is within the range of 0°<=β<=180°, the number of layers of said melt-blown fiber webs is n, which is 2 or more. Preferably, when said fiber webs and said feather and/or down twine and stick together to form the composite material, the other materials can be added on the surface layer or between layers of the composite material to improve comprehensive or specific property of the composite wadding. Preferably, said producing method is suit for incorporating nature material with melt blown fiber; said natural material includes the feather and/or down of other animals and the natural fiber; said melt-blown fiber includes a kind of or n kinds of chemical fiber which is suitable for melt blown process. According to second aspect of the invention, a product of the melt blown composite feather and/or down wadding produced by above method is provided. The product is a thermal insulation material formed by incorporating natural material with melt blown fiber, wherein said feather and/or down is natural one; said chemical fiber is the melt blown fiber. According to third aspect of the invention, an equipment is further provided and comprises an extrude means, a spinning box, die heads, a receiving means, an isolating screen means, a pre-equalizer means, feather and/or down transportation pipes. The die heads are positioned and supported by both die head holders and the coupling; the die heads can be adjusted to form the angle β between the extending directions of melt blown fiber webs; a feather and/or down slot jet is provided between the two die heads; by adjusting and controlling the airflow rate of the inlet airflow valve and the outlet airflow valve of the pre-equalizer means, the feather and/or down can be rotated, pre-equalized and transported in certain quantity to the down slot jet in laminated state, the receiving means may be a screen roller or conveyor belt. Preferably, the number of the die heads may be two or two groups, n or n groups, said angle β is 0°<=β<=180°, the number of the feather and/or down slot jet is one to n-1, and the width of the feather and/or down slot jet is less than or equal to that of the die heads. Preferably, said equipment may include a negative pressure means to provide a negative area on the surface of the receiving means. According to the present invention, the chemical fiber and the natural feather and/or down are compounded directly on its first meeting to form the wadding by the melt-blown method. In the melt-blown process, the feather and/or down and the melt-blown fiber webs twine, overlap and stick together randomly to form the successive laminated wadding which can be cut willfully. This method is not the two step forming method, e.g., needle punching and knitting mechanically, bonding chemically and heat setting, which is not suit to the down forming. Thus, the producing method provided by the invention is simple and reasonable and easily realized. Also according to the invention, the feather and/or down and the chemical fiber twine, stick and mix together randomly by the melt-blown method, wherein the melt-blown fiber is not only the carrier and the linker, but also the "bonding agent" and the protective, so that the compounded feather and/or down can be fixed in the melt blown fiber webs randomly and a lot of tiny cavities are formed. In this way , the feather and/or down can be saved a lot, the cost of the product can be decreased, the characteristics of the thermal insulation and the softness as well as the tensile strength of the wadding can be improved. According to this invention, by adopting such a method, the chemical fiber can be a material such as polypropylene fiber, polyester, nylon, etc. and the feather and down can be the feather and/or down of the other animals, and the natural fiber, such as the nap, the flax, the silk,etc. In addition to that, other specially required materials can also be mixed with the down. Therefore the product may be a multi-materials or multi-layer composite material if desired , and the diversification of the product can be realized. This invention solves the problem of forming, fixing, sewing and cutting of feather and/or down. By application of the invention, the product characteristics of thermal insulation, softness and tensile strength of the formed wadding are much improved. Further objects and advantages of the invention will appear from the following description taken together with the accompanying drawings BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS Figure 1 is a schematic view for the producing method and equipment for MBCFDW. DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS The prefer embodiment of the present invention can be described together with the Fig.1. According to the first embodiment of the invention, As the polymer pellets pass through an extruder 1 and a spinning box 2, they are melted and extruded to the die heads 5, 21. At the same time, the feather and/or down is transported, through a transportation pipe 20, to a feather and/or down slot jet 22 and is blown out in laminated state. In this process, by adjusting the die head holders 3, 19 and the couplings 4, 18, an angle β is formed between the extending directions of the melt blown fiber webs, and can be varied within the range of 0<=β<=180. The pre-equalization of the feather and/or down 6 is realized by rotation of the feather and/or down in the pre-equalizer 17 with the adjustment of the inlet airflow rate of the inlet airflow valve 16, then the output of the feather and/or the down 6, which pass through the inlet airflow pipe 14, is adjusted by the inlet airflow valve 15 and the outlet air flow valve 12. As shown in the figure, the isolating screen 13 is used to protect the down and/or feather 6 from letting out. When the molten polymer is blown out of the die heads 5, 21 and attenuated into fibers, the fibers overlap and stick together randomly to form the melt-blown fiber webs 7. Meanwhile, the pre-equalized feather and/or down 6 is blown out from the feather and/or down slot jet 22, sandwiched and wrapped between the webs, twined, sticked and mixed with the fiber webs together to form the composite material 8, wherein the melt blown fiber webs 7 are not only the carrier and linker but also the bonding agent and the protective, so that the fiber web 7 can be compounded three-dimensionally with the feather and/or down 6. By the continuous wrap of the hot airflow and the negative pressure suction of the receiving device 10, the composite material 8 is condensed, collected and formed on the surface of the receiving device 10. Then the composite material 8 is rotated together with the receiving device 10 to form the composite feather and/or down wadding 11 successively. As shown in the figure, the receiving device 10 is a screen roller or screen conveyor belt. In the device 10, a negative pressure device is provided. The negative pressure receiving area of the receiving device faces the composite material 8. According to the present invention, the width of the feather and/or down slot jet 22 is designed to be less than or equal to that of the die heads 5, 21, so that the feather and/or down 6 is guaranteed to fully fixed and can be protected from scattering or letting out. The present invention is also suit to the composite wadding of a plurality of kinds of materials, multi-layer structure, or more different specifications or different application, which can be produced by different raw polymer materials, or by increasing the number of the die heads or the feather and/or down slot jets, or by the method of overlap, or by incorporating the other materials on the surface of or in the composite material 8, wherein the other materials incorporated may be the woven or nonwoven fabric in band or piece type, and can also be a special material such as pellet, powder, liquid, atomized material, etc. Besides, by controlling the output of the feather and/or down 6, the fine and close chemical fiber layer is formed on the surface of the composite material, so that the product of chemical fiber with feather and/or down composite material or chemical fiber with chemical fiber composite material can be obtained. During the process of production, by adjusting the rotating rate and times of travel motion of the receiving device 10 , the wadding of different specifications is available. The second embodiment of the present invention is similar to the first one, the difference is only that three die heads (two for nylon, one for polypropylene ) and two feather and/or down slot jets are included in the second embodiment, so that the composite wadding of nylon-down-polypropylene-down-nylon can be obtained. The third embodiment of the present invention is also similar to the first one, the difference is only that three die heads (two for polypropylene, one for polyester) and two feather and/or down slot jets are provided, By controlling output of feather and/or down when the receiving device rotating, the overlapped composite wadding with a structure of polypropylene-polyester-polypropylene iterative layers and polypropylene-down-polyster-down-polypropylene composite layers as well as polypropylene-polyester-polypropylene iterative layers can be obtained. While the description of the invention has been given respect to a preferred embodiment, it is not to be constructed in a limited sense. Variations and modification will occur to those skilled in the art. Reference is made to the appended claims for a definition of the invention.

Claims: A producing method for the melt-blown composite feather and/or down wadding, which is characterized by that: a kind of or kinds of polymer are molten, extruded and blown out to form two or more layers of melt-blown fiber webs by melt-blown process; said webs tend to extend to join together, and an angle β exists between the extending directions of said webs; in the meantime, the pre-equalized feather and/or down is transported by the air flow to the feather and/or down slot jet and blown out in a laminated state and is sandwiched and wrapped by said fiber webs, the feather and/or down and said fiber webs twine, stick and mix together randomly and are condensed and formed on the surface of the receiving device successively and directly. A producing method as claimed in claim 1, wherein, said melt-blown angle β is within the range of 0°<=β<=180° , the number of layers of said melt-blown fiber webs is n, which is 2 or more. A producing method as claimed in claim 1, wherein, when said fiber webs and said feather and/or down twine, stick and mix together to form the composite material, the other materials can be added on the surface layer or between layers of the composite material to improve comprehensive or specific property of the composite wadding. A producing method as claimed in claim 1, wherein , said producing method is suit for incorporating nature material with melt blown fiber; said natural material includes the feather and/or down of other animals and the natural fiber; said melt-blown fiber includes a kind of or n kinds of chemical fiber which is suitable for melt blown process. A product of the melt blown composite feather and/or down wadding produced by the method in claim 1, which is characterized by that: the product is a thermal insulation material formed by incorporating natural material with melt blown fiber; wherein said feather and/or down is natural one; said chemical fiber is the melt blown fiber. An equipment specially designed according to the producing method in claim 1, comprising: an extruder means(1), a spinning box(2), die heads(5, 21), a receiving means(10), an isolating screen means(3), a pre-equalizer means(17), feather and/or down transportation pipes(20), which is characterized by that: the die heads(5, 21) are positioned and supported by both die head holders(3, 19) and the coupling (4, 18); the die heads can be adjusted to form the angle β between the extending directions of melt blown fiber webs; a feather and/or down slot jet (22) is provided between the two die heads(5, 21); by adjusting and controlling the airflow rate of the inlet airflow valve(15, 16) and the outlet airflow valve(12) of the pre-equalizer means (17), the feather and/or down(6) can be rotated, pre-equalized and transported in certain quantity to the down slot jet(22) in laminated state, the receiving means(10) may be a screen roller or conveyor belt. An equipment as claimed in claim 6, wherein, the number of the die heads(5, 21) may be two or two groups, n or n groups, said angle β is 0°<=β <=180°, the number of the feather and/or down slot jet(22) is one to n-1, and the width of the feather and/or down slot jet(22) is less than or equal to that of the die heads (5, 21). An equipment as claimed in claim 6, wherein, said equipment may include a negative pressure means(9) to provide a negative area on the surface of the receiving means(10).

Inventors: DONG PING, LI CHUN ZENG, SHAO CHENG XU, SUN SONG YAN, WU JIAN ZHOU, WU ZHENG NAN, YU GAN, DONG, PING, LI, CHUN ZENG, SHAO, CHENG XU, SUN, SONG YAN, WU, JIAN ZHOU, WU, ZHENG NAN, YU, GAN, Dong, Ping, Science Techn.&amp; Trade Centre, Shao, Cheng Xu, Science Techn.&amp; Trade Centre, Sun, Song Yan, Science Techn.&amp; Trade Centre, Wu, Jian Zhou, Science Techn.&amp; Trade Centre, Wu, Zheng Nan, Science Techn.&amp; Trade Centre, Yu, Gan, Science Techn.&amp; Trade Ctr.
Applicants: BEIJING CHALLEN NONWOVEN TECH, BEIJING CHALLEN NONWOVEN TECH. CORP.
Application year: 1993
Main classification: D04H13
IPC codes: D04H1, B68G5, D04H13