JP2005248397A - Multilayered nonwoven fabric and method for producing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a multilayered nonwoven fabric having a high base weight and a soft front surface layer and a back surface layer in which fibers are mutually joined by interlacing without mixing foreign materials such as hot melt or a paste and provided with sufficient peel strength in all the interlayers. <P>SOLUTION: The multilayered nonwoven fabric 1 is composed of the front surface nonwoven fabric layer 2A in which fibers are mutually bound by interlacing, the back surface nonwoven fabric layer 2B in which the fibers are mutually joined by interlacing and a plurality of intermediate nonwoven fabric layers 5 interposed between the front surface nonwoven fabric layer 2A and the back surface nonwoven fabric layer 2B and containing heat fusible fibers. The laminated interfaces among the front surface nonwoven fabric layer 2A, the back surface nonwoven fabric layer 2B and the adjacent next intermediate nonwoven fabric layers 3A and 3B are joined by interlacing of the mutual fibers. The laminated interfaces among the mutual intermediate nonwoven fabric layers 3A, 4A, 4B and 3B are joined by fusion of the mutual heat fusible fibers. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a multi-layer nonwoven fabric having a high basis weight having a flexible surface layer and a back surface layer in which fibers are joined by interlacing and a method for producing the same.

  Currently, non-woven fabrics are used in a wide variety of applications. Of these uses, especially when the nonwoven fabric requires bulk (thickness), for example, in the case of cosmetics, medical cotton, gauze, wiping cloth, etc. In the case of a one-layer structure, the air entangled method such as the spunlace method is difficult to dry completely in the line. Is manufactured by a method of heat-sealing fibers by heat treatment such as an air-through method or a calendar method.

  As a production method for obtaining a bulky nonwoven fabric by laminating a plurality of nonwoven fabrics, a method in which two nonwoven fabrics are bonded together by hot melt, glue, or the like, for example, as shown in Patent Document 1 below, a heat-fusible core Non-woven fabric containing sheath-type composite fibers and bonded between fibers by fusion of sheath components, and core-sheath type composite fibers that are also heat-fusible, and bonded together by fusion of sheath components A non-woven fabric is laminated, and the core-sheath type composite fiber of one non-woven fabric and the core-sheath type composite fiber of the other non-woven fabric are bonded together by fusion of sheath components to obtain a multilayer non-woven fabric. There are methods.

Moreover, in the following Patent Document 2, it has a multilayer structure of two or more layers including the first and second surface layers located on the front and back surfaces, and the first surface layer is non-heat-bondable under processing conditions. And the second surface layer is composed of heat-fusible fiber fiber accumulation layers in which the fibers of the heat-fusible fiber are bonded by heat melting of the fiber itself. A multilayer nonwoven fabric in which layers are joined by exhibiting thermal adhesiveness on the second surface layer side by hot air heating is disclosed.
JP 2001-315239 A JP 63-196753 A

  However, in order to obtain a multilayer nonwoven fabric, when each layer is bonded with hot melt or glue, the hot melt or glue hardens and causes a sense of incongruity, and directly on the skin such as medical, cosmetic puffs and gauze. In the case of a product to be touched, there is a problem that mixing of these foreign substances may cause rough skin.

  In addition, as in the method described in Patent Document 1, each non-woven fabric layer contains a heat-sealing fiber, and when bonding between fibers and layers is attempted by hot air treatment (air-through method), the heat-sealing portion However, since the whole spreads, there is a problem that it becomes unsuitable for non-woven fabric applications requiring “softness” and “softness”. For example, there has been a problem that it cannot be applied to a nonwoven fabric in which the surface layer is desirably a natural fiber layer such as rayon or cotton, such as cosmetic and medical cotton.

  Further, in the case of the method of Patent Document 2, it can be applied even if the surface layer is a natural fiber such as rayon or cotton, such as the above-mentioned cosmetic or medical cotton, but the peel strength between the layers is applicable. There is a problem that delamination may occur during use.

  Therefore, the main problem of the present invention is a multilayer fabric with a high basis weight having a flexible surface layer and a back surface layer in which fibers are joined by entanglement, and all layers can be used without introducing foreign substances such as hot melt and glue. In order to provide sufficient peel strength. Furthermore, it is to make it possible to produce a bulky nonwoven fabric by the spunlace method.

  In order to solve the above-mentioned problem, the present invention according to claim 1 is a multilayer nonwoven fabric in which a plurality of nonwoven fabric layers are laminated, and a laminated interface joined by entanglement of fibers and fusion of heat-fusible fibers. A multilayer nonwoven fabric characterized in that it has both a laminated interface joined by the above.

  In the present invention according to claim 1, the nonwoven fabric is laminated by skillfully combining both the laminated interface joined by entanglement of fibers and the laminated interface joined by fusion of heat-fusible fibers. Therefore, sufficient peel strength is provided between all the layers.

  In order to solve the above-mentioned problems, the present invention according to claim 2 includes a surface nonwoven fabric layer in which fibers are bonded by entanglement, a back nonwoven fabric layer in which fibers are bonded by entanglement, and these surface nonwoven fabric layer and back nonwoven fabric layer. And a plurality of intermediate nonwoven fabric layers containing heat-fusible fibers interposed therebetween, and the laminated interface between the surface nonwoven fabric layer and the adjacent intermediate nonwoven fabric layer of the adjacent next layer is entangled between fibers. The laminated interface between the back nonwoven fabric layer and the adjacent next intermediate nonwoven fabric layer is joined by entanglement between fibers, and the laminated interface between the intermediate nonwoven fabric layers is fused between the heat-fusible fibers. A multilayer nonwoven fabric characterized by being bonded by wearing is provided.

  In the present invention according to claim 2, the front nonwoven fabric layer and the back nonwoven fabric layer are nonwoven fabric layers in which fibers are bonded by a confounding method such as a spunlace method or a needle punch method, and the front nonwoven fabric layer and the back nonwoven fabric layer Since the laminated interface with the intermediate nonwoven fabric layer of the adjacent next layer is joined by entanglement between the fibers, and the other laminated interface is joined by fusion of the heat-fusible fibers, the surface layer is Even though it is a flexible surface layer in which fibers are bonded by entanglement, these non-woven fabric layers on the front and back surfaces are joined to the next layer while having a predetermined peel strength by entanglement. With good peel strength. In the present invention, the term “heat-sealable fiber” refers to a low-melting fiber having a melting point of 200 ° C. or lower, such as an olefin resin such as polyethylene and polypropylene.

  The present invention according to claim 3 provides the multilayer nonwoven fabric according to claim 2, wherein each of the intermediate nonwoven fabric layers is a layer containing 20 to 90% of heat-fusible fibers.

  In the present invention according to claim 4, the intermediate nonwoven fabric layer has a two-layer structure, and each of these layers is a layer containing 20 to 60% by weight of the heat-fusible fiber. A multilayer nonwoven fabric as described above is provided.

  As this invention which concerns on Claim 5, the said intermediate | middle nonwoven fabric layer is made into the multi-layer structure of 4 layers or more, The upper layer and lower layer of these multi-layers contain a heat-fusible fiber in the ratio of 20 to 60 weight%. 4. The multilayer nonwoven fabric according to claim 2, wherein the other intermediate layer is a layer containing 60 to 90 wt% of heat-fusible fibers. In particular, when the intermediate nonwoven fabric layer has four or more layers, the upper layer and the lower layer are set to have a relatively low heat-fusible fiber content so as to increase flexibility and cushioning, and the other intermediate layers are relatively In particular, it is desirable to set the content of the heat-fusible fiber high so as to increase the peel strength.

  As the present invention according to claim 6, there is provided the multilayer nonwoven fabric according to any one of claims 2 to 5, wherein the front nonwoven fabric layer and the back nonwoven fabric layer do not contain heat-fusible fibers.

  As the present invention according to claim 7, the fiber seed composition of the surface nonwoven fabric layer and the fiber seed composition of the back nonwoven fabric layer are made different so as to have different surface characteristics on the front and back surfaces. Is provided.

  The multilayer nonwoven fabric according to the present invention can be manufactured by the manufacturing procedure described in claim 10 below, and the front surface nonwoven fabric layer and the back surface nonwoven fabric layer are manufactured independently in separate steps. It is also possible to make them different.

  As the present invention according to claim 8, there is provided the multilayer nonwoven fabric according to any one of claims 1 to 7, wherein the delamination strength between the nonwoven fabric layers is at least 10 cN / 5 cm or more. When the peel strength between each layer is 10 cN / 5 cm or more, it can be used with confidence without causing peeling at the time of use.

The multilayer nonwoven fabric according to any one of claims 1 to 8, wherein the multilayer nonwoven fabric has a basis weight of 60 g / m ² or more.

As the present invention according to claim 10, the surface nonwoven fabric layer in which the fibers are bonded by entanglement, the back nonwoven fabric layer in which the fibers are bonded by entanglement, and the surface nonwoven fabric layer and the back nonwoven fabric layer are interposed. A method for producing a multilayer nonwoven fabric comprising a plurality of intermediate nonwoven fabric layers containing heat-fusible fibers,
1st which consists of one or more layers which comprise a part of said intermediate | middle nonwoven fabric layer containing the heat-fusible fiber, and the fiber and / or the interlayer were joined by the fusion | melting of the said heat-fusible fibers. After the non-woven web and the second non-woven web serving as the surface non-woven fabric layer are overlaid, the fibers of the first non-woven web and the fibers of the second non-woven web at the lamination interface by the spunlace method or the needle punch method. A first step of joining the layers by entangled with each other to obtain a first laminated nonwoven fabric,
A third layer composed of one or a plurality of layers that constitutes part of the intermediate nonwoven fabric layer, which contains heat-fusible fibers and is bonded between fibers and / or layers by fusing the heat-fusible fibers together. After the non-woven web and the fourth non-woven web serving as the back non-woven fabric layer are overlaid, the fibers of the third non-woven web and the fibers of the fourth non-woven web at the lamination interface by the spunlace method or the needle punch method. A second step of joining the layers by entangled with each other to obtain a second laminated nonwoven fabric,
After the first laminated nonwoven fabric and the second laminated nonwoven fabric are overlapped so that the first nonwoven fabric web surface and the third nonwoven fabric web surface face each other, the first nonwoven fabric web surface and the second laminated nonwoven fabric surface are heated by hot air treatment. And a third step of obtaining the multilayer nonwoven fabric as a final product by fusing the heat-fusible fibers together at the laminated interface with the nonwoven fabric web surface of No. 3 and providing a method for producing the multilayer nonwoven fabric Is done.

  In the present invention described in claim 10, a step of laminating a part of the surface nonwoven fabric layer and the intermediate nonwoven fabric layer by a spunlace method or a needle punch method, a part of the back surface nonwoven fabric layer and the intermediate nonwoven fabric layer being a spunlace method or a needle. In order to manufacture non-woven fabric through the steps of laminating by the punch method and other steps of bonding each laminated non-woven fabric by thermal fusion, a non-woven fabric with a bulky sheet is produced even by the spunlace method. It becomes possible to do.

  As described above in detail, according to the present invention, a multi-layer nonwoven fabric with a high basis weight having a flexible surface layer and a back surface layer in which fibers are joined by entanglement, and without introducing foreign matter such as hot melt or glue, It becomes possible to provide sufficient peel strength between the layers. Moreover, even if it is a spunlace method, it becomes possible to manufacture a nonwoven fabric with a sheet bulk.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a cross-sectional view of a multilayer nonwoven fabric 1 according to the present invention.

  As shown in FIG. 1, the multilayer nonwoven fabric 1 includes a surface nonwoven fabric layer 2 </ b> A in which fibers are bound by entanglement, a back surface nonwoven fabric layer 2 </ b> B in which fibers are bound by entanglement, and the surface nonwoven fabric layer 2 </ b> A and the back surface nonwoven fabric. In the illustrated example, the intermediate nonwoven fabric layer 5 is composed of a plurality of layers containing a heat-fusible fiber interposed between the layers 2B.

  And while the lamination | stacking interface of 2 A of said surface nonwoven fabric layers and intermediate nonwoven fabric layer 3A of an adjacent next layer is joined by the entanglement of fibers, the said back nonwoven fabric layer 2B and the intermediate nonwoven fabric layer 3B of an adjacent next layer, The laminated interfaces of the intermediate nonwoven fabric layers 3A, 4A, 4B, and 3B are joined by fusion of heat-fusible fibers. The entanglement joining for joining the front and back nonwoven fabric layers 2A, 2B and the next intermediate nonwoven fabric layers 3A, 3B is specifically entangled by a spunlace method (water entanglement method) or a needle punch method (mechanical entanglement method). The heat fusion bonding which joins the said intermediate nonwoven fabric layers 3A, 4A, 4B, 3B points out heat processing methods, such as an air through method and a calendar method.

  The front nonwoven fabric layer 2A and the back nonwoven fabric layer 2B do not contain a heat-fusible fiber (referred to a fiber having a melting point of 200 ° C. or lower) when the application is for cosmetics, medical cotton, etc., and cotton. It is desirable to combine natural fibers such as rayon and hemp, or to form a 100% layer alone. Depending on the application, polyester fibers such as polyethylene terephthalate (melting point 255 ° C.) and polybutylene terephthalate (melting point 215 ° C.) and polyamide fibers such as nylon may be contained in a predetermined ratio.

  The surface nonwoven fabric layer 2A and the back nonwoven fabric layer 2B may have the same fiber seed composition and the same surface characteristics, or may have different fiber seed compositions and different surface characteristics. For example, the surface nonwoven fabric layer 2A is a 100% cotton nonwoven fabric, and the back nonwoven fabric layer 2B is a mixed nonwoven fabric of cotton and rayon to improve water retention, etc. You may make it use for a flight.

  The intermediate nonwoven fabric layer 5 is preferably a layer containing 20 to 90% of heat-fusible fibers. As the heat-fusible fiber, any fiber that melts by heating and exhibits adhesiveness to each other can be used. This heat-fusible fiber may be a single fiber or a composite fiber in which two or more synthetic resins are combined. Specific examples include polyolefin single fibers such as polyethylene, polypropylene and polyvinyl alcohol, polyethylene terephthalate / polyethylene, polyethylene terephthalate / polypropylene, polypropylene / polyethylene, polyethylene terephthalate-ethylene / propylene copolymer, low-melting point polyester-polyester, etc. A core-sheath type composite fiber or an eccentric core-sheath type composite fiber whose sheath part is made of a relatively low melting point, or a part of each component consisting of polyethylene terephthalate / polypropylene, polyethylene terephthalate / nylon, polypropylene / polyethylene on the surface Thermal splitting by thermal contraction of one component consisting of exposed split composite fiber or polyethylene terephthalate / ethylene-propylene copolymer Or the like can be used composite fibers. In this case, a core-sheath type composite fiber is preferable when importance is attached to productivity and dimensional stability, and an eccentric type composite fiber is preferable if importance is attached to the volume feeling of a nonwoven fabric. Further, if the softness is regarded as important, when a split type composite fiber or a heat split type composite fiber is used, each component is easily split into ultrafine fibers during high-pressure water flow treatment.

  When the heat-fusible fiber is less than 20% by weight, the bonding rate is small due to the heat-sealing of the fiber, and a predetermined peel strength cannot be ensured. On the other hand, if it exceeds 90% by weight, the whole is cured and the texture is impaired.

  In addition, as shown in FIG. 1, when the intermediate nonwoven fabric layer 5 has a four-layer structure or a layer structure of more than that, the upper layer and the lower layer of the plurality of layers are formed of 20 to 20 heat-fusible fibers. The layer contains 60% by weight, preferably 40-60% by weight, and the other intermediate layers each contain 60-90% by weight, preferably 70-90% by weight, of the heat-fusible fiber. It is desirable to be a layer. Of the intermediate nonwoven fabric layer 5, the upper layer and the lower layer are layers in which the laminated interface is joined with the surface nonwoven fabric layer 2 </ b> A and the back nonwoven fabric layer 2 </ b> B, respectively, and it is desired to give a soft feeling and a good feel to the surface as a product For this purpose, it is desirable to use a layer in which the content of the heat-fusible fiber that causes curing is relatively reduced, and to function as a buffer layer or a cushion layer. In addition, the other intermediate layer is preferably a layer in which heat-fusible fibers are blended at a high content with an emphasis on peel strength. In each of the intermediate nonwoven fabric layers 3A, 4A, 4B, 3B, examples of the fibers other than the heat-fusible fiber include polyester fibers such as polyethylene terephthalate (melting point 255 ° C.), polybutylene terephthalate (melting point 215 ° C.), nylon, and the like. Polyamide fibers can be included. In some cases, natural fibers such as cotton, rayon and hemp may be contained at a low content.

  As shown in FIG. 4 (A), when the intermediate nonwoven fabric layer 5 has a two-layer configuration, the content of the heat-fusible fiber is equal to the content of the intermediate nonwoven fabric layers 3A and 3B in the upper layer and the lower layer. It is desirable to form a layer containing 20 to 60% by weight, preferably 40 to 60% by weight.

  By the way, the delamination strength of the multilayer nonwoven fabric 1 is preferably at least 10 cN / 5 cm or more at each lamination interface. The delamination strength is a value measured by a test method based on JIS L 1086. Specifically, a test specimen of 50 mm × 125 mm was prepared, 5 cm was peeled from the end, each peeled piece was chucked with a load cell machine clamp, and peeled off at a distance of 5 cm at a speed of 100 mm / min. The maximum peel strength at that time was used. If the delamination strength is less than 10 cN / 5 cm, peeling may occur during use. The delamination strength is adjusted by adjusting the content of the heat-fusible fiber, the heating temperature, and the heating time when the lamination interface is joined by hot air treatment (joining between the intermediate nonwoven fabric layers 3A, 4A, 4B, and 3B). In the case where the lamination interface is joined by an entanglement process (joining of the front nonwoven fabric layer 2A and the intermediate nonwoven fabric layer 3A and joining of the back nonwoven fabric layer 2B and the intermediate nonwoven fabric layer 3B), the water pressure of the jet water flow Control is possible by adjusting the processing time, the number of times the needle is passed, the processing time, and the like.

The basis weight of the multilayer nonwoven fabric 1 according to the present invention is 60 g / m ² or more, preferably 80 g / m ² or more and less than 200 g / m ² .

  The above-described multilayer nonwoven fabric 1, for example, the multilayer nonwoven fabric 1 comprising the front nonwoven fabric layer 2A, the back nonwoven fabric layer 2B, and the four intermediate nonwoven fabric layers 5 shown in FIG. 1, undergoes the following first to third steps. Can be manufactured. Hereinafter, the manufacturing procedure will be described together with a specific method using the nonwoven fabric manufacturing line shown in FIG.

[Step 1A]
First, as shown in FIG. 2 (A), heat-fusible fibers are contained, fibers and / or layers are joined by fusing the heat-fusible fibers, and the intermediate nonwoven fabric layer 5 The first nonwoven fabric web 6A composed of the intermediate nonwoven fabric layers 3A and 4A constituting the half layer is obtained.

  Specifically, in the web manufacturing unit 10 shown in FIG. 3 (A), two card machines are used to laminate the non-woven webs 3A and 4A having a two-layer structure, and are passed through the hot air processing unit 12 and heat-sealed. The first non-woven fabric web 6A is manufactured by thermally fusing the adhesive fibers together and thermally fusing the heat-fusible fibers together at the lamination interface. Of the first nonwoven fabric web 6A, the nonwoven fabric web 3A on one side is a layer to be joined to the surface nonwoven fabric layer 2A in a later step, and contains heat-fusible fibers in a proportion of 20 to 60% by weight. ing. The non-woven fabric web 3B on the other side is a layer to be joined to the intermediate non-woven fabric layer 4B in the subsequent third step, and contains 60 to 90% by weight of heat-fusible fibers.

[Step 1B]
As shown in FIG. 2 (B), after the second nonwoven fabric web to be the surface nonwoven fabric layer 2A is superimposed on the first nonwoven fabric web 6A obtained in the step 1A, the spunlace method or the needle punch The fibers of the first nonwoven fabric web 6A (intermediate nonwoven fabric layer 3A) and the fibers of the second nonwoven fabric web (surface nonwoven fabric layer 2A) are entangled with each other by a confounding method such as a method. The first laminated nonwoven fabric 7A is obtained by entanglement.

  Specifically, as shown in FIG. 3 (B), the roll body of the first nonwoven web 6A is set in the web manufacturing unit 10 and fed out, and the second nonwoven fabric layer 2A manufactured by the card machine is formed. The nonwoven fabric web is overlaid on the upper surface of the first nonwoven fabric web 6A, and the entanglement processing unit 11 applies a jet water flow to the first nonwoven fabric web (surface nonwoven fabric layer 2A) at the laminated interface. The nonwoven fabric web 6A is entangled with each other to join the layers to obtain the first laminated nonwoven fabric 7A.

[Step 2A and Step 2B]
In the same process as the above-mentioned 1A process and 1B process, it contains heat-fusible fibers, the fibers and / or the layers are joined by fusion of the heat-fusible fibers, and the intermediate nonwoven fabric. After obtaining the 3rd nonwoven fabric web 6B which consists of intermediate nonwoven fabric layers 3B and 4B which constitutes the half layer of layer 5, the 2nd nonwoven fabric web 2B which becomes the back nonwoven fabric layer 2B is obtained in this 3rd nonwoven fabric web 6B. After superposing the nonwoven webs, the fibers of the third nonwoven web 6B (intermediate nonwoven fabric layer 3B) and the fibers of the fourth nonwoven web (surface nonwoven fabric layer 2B) are entangled at the lamination interface by high-pressure water flow. The second laminated nonwoven fabric 7B is obtained.

[Third step]
As shown in FIG. 2C, the first laminated nonwoven fabric 7A and the second laminated nonwoven fabric 7B are divided into a first nonwoven fabric web surface (intermediate nonwoven fabric layer 4A) and a third nonwoven fabric web surface (intermediate nonwoven fabric). After the layers 4B) face each other, heat fusion is performed at the laminated interface between the first nonwoven web surface (intermediate nonwoven fabric layer 4A) and the third nonwoven fabric web surface (intermediate nonwoven fabric layer 4B) by hot air treatment. The multilayer nonwoven fabric 1 is obtained as a final product by fusing the adhesive fibers together.

  Specifically, as shown in FIG. 3 (C), a roll body of the first laminated nonwoven fabric 7A and a roll body of the second laminated nonwoven fabric 7B are set together, and the first nonwoven web is fed in the feeding process. After superimposing the surface (intermediate nonwoven fabric layer 4A) and the third nonwoven fabric web surface (intermediate nonwoven fabric layer 4B) so as to face each other, the hot air treatment unit 12 gives hot air, thereby providing the first nonwoven web surface ( At the laminated interface between the intermediate nonwoven fabric layer 4A) and the third nonwoven fabric web surface (intermediate nonwoven fabric layer 4B), the heat-fusible fibers are fused together to bond the layers and produce the multilayer nonwoven fabric 1 as the final product. To do.

[Other examples]
(1) In the above embodiment, the multilayer nonwoven fabric 1 including the front nonwoven fabric layer 2A, the back nonwoven fabric layer 2B, and the four intermediate nonwoven fabric layers 5 has been described in detail. The intermediate nonwoven fabric layer 5 is shown in FIG. Thus, a two-layer structure may be used, or a six-layer structure may be used as shown in FIG. That is, the intermediate nonwoven fabric layer 5 should just be at least 2 layers or more. In addition, what is necessary is just to divide | segment and manufacture to 3 layers and 2 layers, when the intermediate | middle nonwoven fabric layer 5 is an odd number layer, for example, 5 layers.

  The present invention is, for example, cosmetics, medical cotton (also called cut cotton, cotton puff or puff), gauze, wiping cloth, bed sheets, pillow covers, etc. It is preferably used as a surface sheet of a paper diaper.

It is a cross-sectional view of the multilayer nonwoven fabric 1 which concerns on this invention. It is a figure which shows the manufacture procedure of the said multilayer nonwoven fabric. It is a line figure which shows the manufacturing method of the said multilayer nonwoven fabric 1. FIG. It is a transverse cross section showing an example of multilayer nonwoven fabrics 1B and 1C.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Multilayer nonwoven fabric, 2A ... Surface nonwoven fabric layer, 2B ... Back surface nonwoven fabric layer, 3A, 4A, 3B, 4B ... Each intermediate nonwoven fabric layer, 5 ... Intermediate nonwoven fabric layer (whole), 6A ... 1st nonwoven fabric web, 6B ... 1st 3 nonwoven webs, 7A ... first laminated nonwoven fabric, 7B ... second laminated nonwoven fabric

Claims (10)

  A multilayer nonwoven fabric in which a plurality of nonwoven fabric layers are laminated, characterized by having both a laminated interface joined by entanglement of fibers and a laminated interface joined by fusion of heat-fusible fibers. Multilayer nonwoven fabric.   It contains a surface nonwoven fabric layer in which fibers are bonded by entanglement, a back nonwoven fabric layer in which fibers are bonded by entanglement, and a heat-fusible fiber interposed between the surface nonwoven fabric layer and the back nonwoven fabric layer. It is composed of a plurality of intermediate nonwoven fabric layers, and the laminated interface between the surface nonwoven fabric layer and the adjacent intermediate nonwoven fabric layer is joined by entanglement of fibers, and the back nonwoven fabric layer and the adjacent next layer A multilayer nonwoven fabric characterized in that a laminated interface with an intermediate nonwoven fabric layer is joined by entanglement of fibers, and a laminated interface between the intermediate nonwoven fabric layers is joined by fusion of heat-fusible fibers.   The multilayer nonwoven fabric according to claim 2, wherein each of the intermediate nonwoven fabric layers is a layer containing 20 to 90% of heat-fusible fibers.   The multilayer nonwoven fabric according to any one of claims 2 and 3, wherein the intermediate nonwoven fabric layer has a two-layer structure, and each of these layers is a layer containing 20 to 60% by weight of heat-fusible fibers.   The intermediate nonwoven fabric layer is composed of four or more layers, and the upper layer and the lower layer of these layers are layers containing 20 to 60% by weight of heat-fusible fibers, and the other intermediate layers are The multilayer nonwoven fabric according to any one of claims 2 and 3, wherein each layer is a layer containing 60 to 90% by weight of heat-fusible fibers.   The multilayer nonwoven fabric according to any one of claims 2 to 5, wherein the front nonwoven fabric layer and the back nonwoven fabric layer do not contain heat-fusible fibers.   The multilayer nonwoven fabric according to any one of claims 2 to 6, wherein the fiber seed composition of the surface nonwoven fabric layer and the fiber seed composition of the back nonwoven fabric layer are made different so that the front and back surfaces have different surface characteristics.   The multilayer nonwoven fabric according to any one of claims 1 to 7, wherein an interlayer peel strength between the nonwoven fabric layers is at least 10 cN / 5 cm or more. The multilayer nonwoven fabric according to any one of claims 1 to 8, wherein the multilayer nonwoven fabric has a basis weight of 60 g / m ² or more. It contains a surface nonwoven fabric layer in which fibers are bonded by entanglement, a back nonwoven fabric layer in which fibers are bonded by entanglement, and a heat-fusible fiber interposed between the surface nonwoven fabric layer and the back nonwoven fabric layer. A method for producing a multilayer nonwoven fabric comprising a plurality of intermediate nonwoven fabric layers,
1st which consists of one or more layers which comprise a part of said intermediate | middle nonwoven fabric layer containing the heat-fusible fiber, and the fiber and / or the interlayer were joined by the fusion | melting of the said heat-fusible fibers. After the non-woven web and the second non-woven web serving as the surface non-woven fabric layer are overlaid, the fibers of the first non-woven web and the fibers of the second non-woven web at the lamination interface by the spunlace method or the needle punch method. A first step of joining the layers by entangled with each other to obtain a first laminated nonwoven fabric,
A third layer composed of one or a plurality of layers that constitutes part of the intermediate nonwoven fabric layer, which contains heat-fusible fibers and is bonded between fibers and / or layers by fusing the heat-fusible fibers together. After the non-woven web and the fourth non-woven web serving as the back non-woven fabric layer are overlaid, the fibers of the third non-woven web and the fibers of the fourth non-woven web at the lamination interface by the spunlace method or the needle punch method. A second step of joining the layers by entangled with each other to obtain a second laminated nonwoven fabric,
After the first laminated nonwoven fabric and the second laminated nonwoven fabric are overlapped so that the first nonwoven fabric web surface and the third nonwoven fabric web surface face each other, the first nonwoven fabric web surface and the second laminated nonwoven fabric surface are heated by hot air treatment. And a third step of obtaining the multilayer nonwoven fabric as a final product by fusing the heat-fusible fibers with each other at the laminated interface with the nonwoven fabric web surface.

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