CN101775683A - Normal reinforced 2.5D fabric and weaving method thereof - Google Patents
Normal reinforced 2.5D fabric and weaving method thereof Download PDFInfo
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- CN101775683A CN101775683A CN201010031344A CN201010031344A CN101775683A CN 101775683 A CN101775683 A CN 101775683A CN 201010031344 A CN201010031344 A CN 201010031344A CN 201010031344 A CN201010031344 A CN 201010031344A CN 101775683 A CN101775683 A CN 101775683A
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Abstract
The invention discloses a normal reinforced 2.5D fabric and a weaving method thereof. The fabric comprises a warp yarn system and a weft yarn system, wherein the warp yarn system and the weft yarn system are interwoven to form a layer-layer-corner interlocking structure. The fabric is characterized by also comprising a normal yarn system, wherein the normal yarn system is perpendicular to the interwoven warp yarn system and weft yarn system, penetrates through the thickness of the fabric, and is held by the adjacent warp yarn and weft yarn, thereby forming the normal reinforced 2.5D fabric. The fabric weaving method is realized in a way that: a technique normal yarn system is added based on the prior weaving method of the 2.5D fabric; and the normal yarn is perpendicularly led between every two adjacent warp yarn rows by a yarn leading device in the weft yarn direction in a certain leading way, penetrates through the thickness direction of the fabric and is held by the adjacent weft yarn rows, thereby weaving the 2.5D fabric. The method comprises the following steps: arranging yarn initially, making a shedding motion, leading in the weft yarn, leading in the normal yarn, making a shedding motion for the second time, leading in the weft yarn for the second time, and repeating the last three steps, thereby obtaining the normal reinforced 2.5D fabric.
Description
Technical field
The present invention relates to stereo fabric and weaving technology thereof, be specially a kind of normal direction and strengthen 2.5D fabric and weaving method thereof.
Background technology
2.5D fabric and weaving technology thereof are a kind of novel three dimension fabric weaving technologies that develops rapidly in recent years.2.5D fabric is on the basis of woven three-dimensional woven equipment, utilizes many healds to make warp thread form the multilayer opening, introduces a class layer stereo fabric that forms behind the weft yarn in certain sequence.2.5D in the fabric, weft yarn is in straightened condition substantially, adjacent weft layers is passed in the warp thread bending, forms shallow layer by layer fabric construction.Because warp thread does not run through whole fabric thickness, this kind fabric is commonly referred to as 2.5D fabric (or claiming angle-interlock fabric layer by layer).
Characteristics such as 2.5D the fabric reinforced composite materials has, and structure is tight, good integrity, good mechanical performance, the while can be realized the near clean formation type of Large Size Special Shaped structural member, has in fields such as Aeronautics and Astronautics, the energy, traffic, physical culture widely to use.The three dimension stereo fabric weaving method that Chinese patent application CN1182813A proposes can be weaved the fabric of three latitudes, six latitudes or nine latitude different-thickness.Chinese patent application CN1540052A has proposed a kind of weaving method that is used for the three dimension stereo fabric of composite variable cross-section, relates to three-dimensional orthogonal stereochemical structure, accurate orthogonal stereo structure, angle interlock.Chinese patent application CN1570234A has proposed the weaving process of the woven three dimensional fabric of a kind of profiled-cross-section, adopts many healds to realize orthogonal shallow connection structure fabric and curved layer by layer moulding of handing over shallow connection structure fabric layer by layer.Aeronautical material journal (Yang Caiyun etc., the relation research of resin-based three-dimensional woven composite structure and mechanical property, 2006,26 (5): 51-55) studied the performance of four kinds of 2.5D fabric constructions and reinforced composite materials thereof.Four kinds of fabrics comprise common angle-interlock fabric layer by layer, laying-in angle-interlock fabric, inlaid thread angle-interlock fabric and laying-in inlaid thread angle-interlock fabric layer by layer layer by layer layer by layer.More as can be seen, composite only is 1/3rd of a TENSILE STRENGTH along the compressive strength of warp thread direction from four kinds of fabric reinforced composite materials performances.Though the crooked mutually interlocking of 2.5D fabric warp thread on thickness direction, the shearing strength at intersection that has significantly improved composite is cut performance, but because the warp thread degree of crook is higher in the 2.5D fabric construction, when the compressive load that is subjected to along warp thread direction is done the time spent, the crooked easier generation unstable failure of warp thread makes that the warp-wise compressive property of 2.5D fabric reinforced composite is relatively poor.
Summary of the invention
At the deficiencies in the prior art, the technical problem to be solved in the present invention is to provide a kind of normal direction to strengthen 2.5D fabric and weaving method thereof.This 2.5D fabric has the normal direction yarn that runs through the fabric thickness direction, and the composite of being made by this 2.5D fabric has higher interlayer (normal direction) bonding strength, can effectively reduce the compression unstability of warp thread, significantly improves the warp-wise compressive property of composite.This weaving method is on the basis of existing 2.5D fabric knitting technology, increased a normal direction yarn system, this normal direction yarn is introduced between the adjacent longitude yarn row by row are vertical by yarn withdrawal device by certain introducing mode along weft direction, and technology is simple, and is workable.
The technical scheme that the present invention solves described fabric technology problem is: design a kind of normal direction and strengthen the 2.5D fabric, comprise warp systems and weft systems, and warp systems is interweaved angle interlock layer by layer with weft systems, it is characterized in that also comprising normal direction yarn system, normal direction yarn system is perpendicular to warp systems that interweaves and weft systems, the thickness that runs through fabric, and by adjacent warp thread and weft yarn clamping, constitute described normal direction and strengthen the 2.5D fabric.
The technical scheme that the present invention solves described weaving method technical problem is: design the weaving method that a kind of normal direction strengthens the 2.5D fabric, this weaving method is used to weave normal direction of the present invention and strengthens the 2.5D fabric, on existing 2.5D fabric knitting method basis, increased a normal direction yarn system, the normal direction yarn is introduced between the adjacent longitude yarn row by row are vertical by yarn withdrawal device by certain introducing mode along weft direction, the thickness direction that runs through fabric, and by adjacent weft yarn row clamping, realize that normal direction strengthens weaving of 2.5D fabric, concrete processing step comprises:
(1), initially arrange yarn, according to arranging M layer N row warp thread on many healds of shape and size designing requirement in the heald frame of the front and back of three-dimensional loom of fabric;
(2), harness motion, heald frame relative motion up and down before and after the heald lifting device control drives warp thread and forms M+1 layer shed open,
(3), introduce weft yarn, in the M+1 layer shed open that forms, successively introduce weft yarn successively by a weft inserting apparatus, perhaps by more than one weft inserting apparatus simultaneously multilayer introduce weft yarn; After wefting insertion was finished, beating-up mechanism was squeezed into fell to weft yarn to the fell translation;
(4), introduce the normal direction yarn, the normal direction shedding motion moves along broadwise, makes warp thread pursue the row opening, forms N-1 row shed open, yarn withdrawal device is by certain introducing mode vertical normal direction yarn of introducing in the shed open between the consecutive warp row successively; Certain introducing mode of described normal direction yarn comprises around knot mode and implantation mode, described is that the normal direction yarn from top to bottom or is from the bottom to top introduced between longitude yarn row around the knot mode, after passing all thread layers, walking around longitude yarn row again draws between the consecutive warp row from the bottom to top or from top to bottom, and pursue row and carry out, until between all longitude yarn rows, all introduce the normal direction yarns; Described implantation mode is that the normal direction yarn is introduced from top to bottom or from the bottom to top between longitude yarn row, pass all thread layers after, between same longitude yarn row, draw from the bottom to top or from top to bottom again, and undertaken by row, until between all longitude yarn rows, all introduce the normal direction yarns;
(5), the secondary harness motion, heald frame relative motion up and down before and after the heald lifting device control, the consecutive warp layer is interlaced, warp thread is crooked and straight weft yarn is tied up, and forms new M+1 layer shed open;
(6), secondary introduces weft yarn, in new M+1 layer shed open, set by step the mode of (3) respectively in each layer shed open secondary introduce weft yarn, the weft yarn of introducing gets up the clamping of normal direction yarn, beating-up mechanism is squeezed into fell to weft yarn and normal direction yarn simultaneously to the fell translation;
(7), repeat described processing step (4)-(6), promptly obtain normal direction of the present invention and strengthen the 2.5D fabric.
Compared with prior art, normal direction of the present invention strengthens the 2.5D fabric except the typical structure feature with existing 2.5D fabric, also has the vertical normal direction yarn of introducing along weft direction that runs through the fabric thickness direction, further strengthened the globality of (normal direction) structure between tissue layer, effectively reduced the compression unstability of warp thread, significantly improve the warp-wise compressive property of 2.5D Fabric composites, can be used for the main force support structure in fields such as Aeronautics and Astronautics, the energy and the backing material of thermal protection struc ture composite.Weaving method of the present invention is on the basis of existing 2.5D fabric knitting technology, increased a normal direction yarn system, the normal direction yarn is introduced between the adjacent longitude yarn row by row are vertical by yarn withdrawal device by certain mode along weft direction, it is simple to have technology, the weaving efficiency height, characteristics such as workable.
Description of drawings
Fig. 1 is the 2.5D fabric basic structure schematic diagram of prior art; 1 is warp thread among the figure, and 2 is weft yarn.
Fig. 2 is that the broadwise of prior art strengthens 2.5D fabric construction schematic diagram; 3 are broadwise enhancing yarn among the figure.
Fig. 3 is that the warp-wise of prior art strengthens 2.5D fabric construction schematic diagram; 4 are warp-wise enhancing yarn among the figure.
Fig. 4 be prior art strengthen 2.5D fabric construction schematic diagram through broadwise.
Fig. 5 strengthens the warp thread initial arrangement structural representation of a kind of embodiment of 2.5D fabric knitting method for normal direction of the present invention.N1-N6 among the figure is the longitude yarn row numbering; N1, N3 N5 are the odd column warp thread; N2, N4 N6 are the even column warp thread.
Fig. 6 strengthens the warp opening movement schematic diagram of a kind of embodiment of 2.5D fabric knitting method for normal direction of the present invention; K1 among the figure is preceding heald frame, and K2 is the back heald frame.
Fig. 7 (a) and the weft yarn that (b) strengthens a kind of embodiment of 2.5D fabric knitting method for normal direction of the present invention are introduced schematic diagram;
Fig. 8 strengthens a kind of embodiment of normal direction yarn introducing method (embodiment 1) schematic diagram of 2.5D fabric knitting method for normal direction of the present invention; 5 is the normal direction yarn among the figure, and J1 is a J1 root warp thread, and J2 is a J2 root warp thread.
Fig. 9 strengthens the structural representation of a kind of embodiment of 2.5D fabric (embodiment 1) for normal direction of the present invention; Wherein, Fig. 9 (a) is a broadwise cross section fabric construction schematic diagram, and Fig. 9 (b) is a warp cross section fabric construction schematic diagram.
Figure 10 strengthens another kind of embodiment (embodiment 2) schematic diagram of normal direction yarn introducing method of 2.5D fabric knitting method for normal direction of the present invention.
Figure 11 strengthens the structural representation of the another kind of embodiment of 2.5D fabric (embodiment 2) for normal direction of the present invention; Wherein, Figure 11 (a) is a broadwise cross section fabric construction schematic diagram, and Figure 11 (b) is a warp cross section fabric construction schematic diagram.
The specific embodiment
Further narrate the present invention below in conjunction with embodiment and accompanying drawing thereof.
Normal direction of the present invention strengthens 2.5D fabric (being called for short the 2.5D fabric), comprise warp systems and weft systems, and warp systems is interweaved angle interlock layer by layer with weft systems, it is characterized in that also comprising normal direction yarn system, normal direction yarn system is perpendicular to warp systems that interweaves and weft systems, the thickness that runs through fabric, and by adjacent warp thread and weft yarn clamping, constitute described normal direction and strengthen the 2.5D fabric.
Normal direction of the present invention strengthens the 2.5D fabric and is made up of three orthogonal yarn systems.Three orthogonal yarn systems are respectively warp systems, weft systems and normal direction yarn system.Warp systems is the multilayer warp structures, and the warp thread number of plies can be according to the fabric thickness design of product requirement.The weft systems horizontal vertical is in the multilayer warp systems, and successively or simultaneously multilayer is introduced thread layer successively.Warp systems and weft systems are intertwined to form angle interlock layer by layer.Warp systems that interweaves and weft systems are same as the 2.5D fabric of prior art substantially.Innovative design of the present invention is suitably to have introduced normal direction yarn system on existing 2.5D fabric (referring to Fig. 1-4) basis.Normal direction yarn system runs through the thickness of fabric perpendicular to warp systems that interweaves and weft systems, and by adjacent warp thread and weft yarn clamping, constitutes normal direction of the present invention and strengthen the 2.5D fabric.
The present invention has designed the weaving method (being called for short weaving method, referring to Fig. 5-11) that described normal direction strengthens the 2.5D fabric simultaneously, and this weaving method is to realize on the basis of existing 2.5D fabric (referring to Fig. 1-4) and weaving method thereof.The improvement feature of weaving method of the present invention is, increased a normal direction yarn system, the normal direction yarn is introduced between the adjacent longitude yarn row by row are vertical by yarn withdrawal device by certain introducing mode along weft direction, the thickness direction that runs through fabric, and by adjacent weft yarn row clamping, and then realize that normal direction strengthens weaving of 2.5D fabric.
Weaving method of the present invention specifically comprises following processing step:
(1), initially arranges yarn.According to arranging M layer N row warp thread on many healds of shape and size designing requirement in the heald frame of the front and back of three-dimensional loom of fabric;
(2), harness motion.Heald frame relative motion up and down before and after the heald lifting device control drives warp thread and forms M+1 layer shed open,
(3), introduce weft yarn.In the M+1 layer shed open that forms, successively introduce weft yarn successively by a weft inserting apparatus, perhaps by more than one weft inserting apparatus multilayer introducing simultaneously weft yarn, beating-up mechanism is squeezed into fell to weft yarn to the fell translation;
(4), introduce the normal direction yarn.The normal direction shedding motion moves along broadwise, makes warp thread pursue the row opening, forms N-1 row shed open, and yarn withdrawal device is vertically introduced the normal direction yarn successively by certain introducing mode in the shed open between the consecutive warp row;
(5), secondary harness motion.Heald frame relative motion up and down before and after the heald lifting device control, the consecutive warp layer is interlaced, and warp thread is crooked also to tie up straight weft yarn, forms new M+1 layer shed open;
(6), secondary is introduced weft yarn.In new M+1 layer shed open, set by step the mode of (3) respectively in each layer shed open secondary introduce weft yarn, the weft yarn of introducing gets up the clamping of normal direction yarn, beating-up mechanism is squeezed into fell to weft yarn and normal direction yarn simultaneously to the fell translation;
(7), repeat described processing step (4), (5), (6), promptly obtain normal direction of the present invention and strengthen the 2.5D fabric.
Above technical process is carried out according to actual cycle.
In the weaving method of the present invention, step 1,2,3,5,6 is the process of prior art, is used to weave the basic structure (referring to Fig. 1) of 2.5D fabric; Step 4 is an innovative technology step of the present invention, is used to be implemented in suitably introduce the normal direction yarn on the 2.5D fabric basic structure basis, weaves the 2.5D fabric that normal direction of the present invention strengthens.
The introducing mode of the described introducing normal direction of weaving method of the present invention yarn has two kinds:
The one, around the knot mode: the normal direction yarn from top to bottom or is from the bottom to top introduced between longitude yarn row, after passing all thread layers, walk around longitude yarn row again and between the consecutive warp row, draw from the bottom to top or from top to bottom, and undertaken, until between all longitude yarn rows, all introduce the normal direction yarn by row.
The 2nd, the implantation mode: the normal direction yarn is introduced from top to bottom or from the bottom to top between longitude yarn row, pass all thread layers after, between same longitude yarn row, draw from the bottom to top or from top to bottom again, and undertaken by row, until between all longitude yarn rows, all introduce the normal direction yarns.
Two kinds of differences of introducing mode of described normal direction yarn are: in the fabric that employing normal direction yarn implantation mode is made into, two normal direction yarns are arranged between same longitude yarn row; And the normal direction yarn has only a normal direction yarn between same longitude yarn row in the fabric that the knot mode is made into.Therefore, in order to improve normal direction yarn shared ratio in whole 2.5D fabric, under the constant situation of normal direction yarn thickness, should adopt the implantation mode to introduce the normal direction yarn.
The present invention does not address part and is applicable to prior art.
Provide specific embodiments of the invention below.Specific embodiment only is used to describe in detail 2.5D fabric of the present invention and weaving method thereof, does not limit claim of the present invention.
Warp thread is 190tex quartz fibre * 3 strand, weft yarn is 190tex quartz fibre * 6 strand, the normal direction yarn is 190tex quartz fibre * 1 strand, the warp thread number of plies is 6 layers, fabric through close be 90/10 centimetres, filling density is 20/10 centimetres, and fabric width is 100 centimetres, and fabric construction is that normal direction strengthens angle interlock layer by layer.
Longitude and latitude yarn process parameter designing:
(1), warp thread columns N=fabric width * through close=100 * 90 ÷ 10=900 row;
(2), warp thread number of plies M=6 layer, the weft yarn number of plies=M+1=7 layer;
Concrete implementation step:
1, initially arranges yarn.Warp thread is arranged as 6 layer of 900 row, simple for illustrating, choose 6 layer 6 and classify signal as (referring to Fig. 5, zero represents the warp thread in the odd column, ● represent the warp thread in the even column, warp thread is penetrated respectively in (sheet) heald frame of front and back, and wherein the warp thread of zero representative penetrates among the preceding heald frame K1, ● the warp thread of representative penetrates among the heald frame K2 of back).
2, harness motion.With the move up position of a warp thread of preceding heald frame K1, and will back heald frame K2 move down the position of a warp thread, form the initial position (referring to Fig. 6) of warp thread.The mutual alternating movement of warp thread forms shed open.
3, introduce weft yarn.Weft yarn 2 is introduced successively the multilayer shed open (referring to Fig. 7 (a)) that forms by warp thread 1 by weft inserting apparatus from top to bottom.The number of plies of weft yarn is 7 layers.After wefting insertion was finished, beating-up mechanism was squeezed into fell to weft yarn to the fell translation.
4, introduce the normal direction yarn.Employing is from left to right introduced in longitude yarn row (referring to Fig. 8) with normal direction yarn 5 along weft direction around the knot mode, be that normal direction yarn 5 is from vertically introducing from top to bottom between N1 row warp thread and the N2 row warp thread, after passing all thread layers, form the yarn circle around tying-in yarn J1, again from from bottom to top vertically introducing between N2 row warp thread and the N3 row warp thread, after passing all thread layers, walk around warp thread J2 and form the yarn circle, from vertically introducing from top to bottom between N3 row warp thread and the N4 row warp thread, so vertically introduced normal direction yarn 5 by being listed between the consecutive warp row successively again along weft direction.
5, secondary harness motion.Preceding heald frame K1 is moved down two warp thread positions, and two the warp thread positions that will back heald frame K2 move up, the consecutive warp layer is interlaced, and warp thread is crooked and straight weft yarn is tied up, and forms new shed open.
6, secondary is introduced weft yarn.From going up and weft yarn 2 introduced shed open (referring to Fig. 7 (b)) successively down by weft inserting apparatus.The weft yarn of introducing gets up the clamping of normal direction yarn.After wefting insertion was finished, beating-up mechanism was squeezed into fell to weft yarn 2 and normal direction yarn 5 simultaneously to the fell translation.
7, repeat described processing step 4,5,6, promptly obtain normal direction of the present invention and strengthen 2.5D fabric (referring to Fig. 9).
Warp thread is 190tex quartz fibre * 4 strand, weft yarn is 190tex quartz fibre * 5 strand, the normal direction yarn is 190tex quartz fibre * 5 strand, the warp thread number of plies is 6 layers, fabric through close be 57/10 centimetres, filling density is 40/10 centimetres, and fabric width is 100 centimetres, and fabric construction is that normal direction strengthens angle interlock layer by layer.
Longitude and latitude yarn process parameter designing:
1, warp thread columns N=fabric width * through close=100 * 57 ÷ 10=570 row.
2, warp thread number of plies M=6 layer, the weft yarn number of plies=M+1=7 layer.
Concrete implementation step:
1, initially arranges yarn.Warp thread is arranged as 6 layer of 570 row, chooses 6 layer 6 and classify signal as that (referring to Fig. 5, zero represents the warp thread in the odd column, ● represent the warp thread in the even column, these warp thread are penetrated respectively in the sheet heald frame of front and back, and wherein the warp thread of zero representative penetrates among the preceding heald frame K1, ● the warp thread of representative penetrates among the heald frame K2 of back).
2, harness motion.With the move up position of a warp thread of preceding heald frame K1, and will back heald frame K2 move down the position of a warp thread, form the initial position (referring to Fig. 6) of warp thread.The mutual alternating movement of warp thread forms shed open.
3, introduce weft yarn.Weft yarn 2 is introduced successively the multilayer shed open (referring to Fig. 7 (a)) that forms by warp thread 1 by weft inserting apparatus from top to bottom.The number of plies of weft yarn is 7 layers.After wefting insertion was finished, beating-up mechanism was squeezed into fell to the fell translation with weft yarn.
4, introduce the normal direction yarn.Adopt the implantation mode that normal direction yarn 5 is introduced (referring to Figure 10) in the longitude yarn row from left to right along weft direction, be that normal direction yarn 5 is from vertically introducing from bottom to top between N1 row warp thread and the N2 row warp thread, after passing all thread layers, between the 1st row warp thread J1 and the 2nd row warp thread J2, from top to bottom return, after walking around warp thread J1 again, from vertically introducing from bottom to top between N2 row warp thread and the N3 row warp thread, after passing all thread layers, between N2 row warp thread and N3 row warp thread, from top to bottom return again, so vertically introduced normal direction yarn 5 by being listed between the consecutive warp row successively along weft direction.
5, secondary harness motion.Preceding heald frame K1 is moved down two warp thread positions, and two the warp thread positions that will back heald frame K2 move up, the consecutive warp layer is interlaced, and warp thread is crooked and straight weft yarn is tied up, and forms new shed open.
6, secondary is introduced weft yarn.From going up and weft yarn 2 introduced shown in the shed open (referring to Fig. 7 (b)) successively down by weft inserting apparatus.The weft yarn of introducing 2 gets up 7 clampings of normal direction yarn.After wefting insertion was finished, beating-up mechanism was squeezed into fell with weft yarn 2 and normal direction yarn 5 simultaneously to the fell translation.
7, repeat described processing step 4,5,6, promptly obtain normal direction of the present invention and strengthen 2.5D fabric (referring to Figure 11).
Claims (2)
1. a normal direction strengthens the 2.5D fabric, comprise warp systems and weft systems, and warp systems is interweaved angle interlock layer by layer with weft systems, it is characterized in that also comprising normal direction yarn system, normal direction yarn system is perpendicular to warp systems that interweaves and weft systems, the thickness that runs through fabric, and by adjacent warp thread and weft yarn clamping, constitute described normal direction and strengthen the 2.5D fabric.
2. the described normal direction of a claim 1 strengthens the weaving method of 2.5D fabric, this weaving method is on existing 2.5D fabric knitting method basis, increased a normal direction yarn system, the normal direction yarn is introduced between the adjacent longitude yarn row by row are vertical by yarn withdrawal device by certain introducing mode along weft direction, the thickness direction that runs through fabric, and, realize that normal direction strengthens weaving of 2.5D fabric by adjacent weft yarn row clamping, concrete processing step comprises:
(1), initially arrange yarn, according to arranging M layer N row warp thread on many healds of shape and size designing requirement in the heald frame of the front and back of three-dimensional loom of fabric;
(2), harness motion, heald frame relative motion up and down before and after the heald lifting device control drives warp thread and forms M+1 layer shed open,
(3), introduce weft yarn, in the M+1 layer shed open that forms, successively introduce weft yarn successively by a weft inserting apparatus, perhaps by more than one weft inserting apparatus simultaneously multilayer introduce weft yarn; After wefting insertion was finished, beating-up mechanism was squeezed into fell to weft yarn to the fell translation;
(4), introduce the normal direction yarn, the normal direction shedding motion moves along broadwise, makes warp thread pursue the row opening, forms N-1 row shed open, yarn withdrawal device is by certain introducing mode vertical normal direction yarn of introducing in the shed open between the consecutive warp row successively;
Certain introducing mode of described normal direction yarn comprises around knot mode and implantation mode, described is that the normal direction yarn from top to bottom or is from the bottom to top introduced between longitude yarn row around the knot mode, after passing all thread layers, walking around longitude yarn row again draws between the consecutive warp row from the bottom to top or from top to bottom, and pursue row and carry out, until between all longitude yarn rows, all introduce the normal direction yarns; Described implantation mode is that the normal direction yarn is introduced from top to bottom or from the bottom to top between longitude yarn row, pass all thread layers after, between same longitude yarn row, draw from the bottom to top or from top to bottom again, and undertaken by row, until between all longitude yarn rows, all introduce the normal direction yarns;
(5), the secondary harness motion, heald frame relative motion up and down before and after the heald lifting device control, the consecutive warp layer is interlaced, warp thread is crooked and straight weft yarn is tied up, and forms new M+1 layer shed open;
(6), secondary introduces weft yarn, in new M+1 layer shed open, set by step the mode of (3) respectively in each layer shed open secondary introduce weft yarn, the weft yarn of introducing gets up the clamping of normal direction yarn, beating-up mechanism is squeezed into fell to weft yarn and normal direction yarn simultaneously to the fell translation;
(7), repeat described processing step (4)-(6), promptly obtain normal direction of the present invention and strengthen the 2.5D fabric.
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