JPH076120B2 - Honeycomb three-dimensional knit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is a honeycomb core structure obtained by knitting a fibrous material and having a wide range of uses as a reinforcing material, a filler, a constituent material, a cushioning material, and the like. Regarding

[Conventional technology]

Conventionally, honeycomb structures have been widely used not only in the fields of aviation, space, and military, but also for the purpose of reducing the weight, strengthening, shock absorption, heat insulation, and soundproofing of various daily materials. FRP honeycomb made of material is one of the important industrial materials in the future as a composite material.

In general, the honeycomb structure, as a honeycomb core simple substance,
Further, it is used as a sandwich panel in which two outer plates are bonded to a honeycomb core material. Conventionally, in order to manufacture a honeycomb core using a fibrous material, a sheet-like material made of a fibrous material, for example, a woven fabric is formed into a corrugated corrugated sheet by a corrugated roll and is formed by adhering these in parallel. However, there is a method of laminating and adhering the sheet-like material while shifting the adhering portion of the sheet-like material, and then expanding the adhering portion.

[Problems to be solved by the invention]

It is an object of the present invention to provide a honeycomb solid knitted fabric which can be formed by a knitting process by solving the problem of the conventional honeycomb core made of a fibrous material.

[Means for solving problems]

The honeycomb-shaped three-dimensional knitted fabric of the present invention for solving the above problems is composed of a plurality of strip-shaped members made of a fibrous material. The strip-shaped member is composed of at least one pair of opposing loop-shaped stitch rows, connecting yarns for connecting the stitch rows, and at least two insertion yarns inserted between the connecting yarns so as to intersect the connecting yarns in a crossing direction. The strip-shaped member is partially connected to the adjacent strip-shaped member by the insertion yarn and is formed into a honeycomb shape to form a honeycomb-shaped three-dimensional knitted fabric.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings showing an embodiment of the honeycomb core-structured knitted fabric of the present invention.

FIG. 1 is a model diagram showing a honeycomb-shaped three-dimensional knitted fabric of the present invention. The strip-shaped member indicated by 3 in the drawing has at least a pair of facing loop-shaped stitches 1 and 1 ′ each formed in a row in the wale direction (W direction in the drawing), and has a facing loop-shaped stitch row. The loop-shaped stitch rows are connected to each other by a connecting yarn 2. Between the connecting yarns 2, a plurality of insertion yarns 5 _-1 , 5 _-2 , 6
Are inserted so as to intersect with the connecting yarns 2 in the intersecting direction to form a woven fabric structure. The crossing state of the connecting yarn and the inserting yarn is
As shown in FIG. 1, each of the plurality of insertion yarns 5 _-1 , 6, 5 _-2 with respect to one connecting yarn that connects the facing stitches alternates ups and downs, and has a wale direction (W In the direction), symmetrical floating and sinking may be repeated for each connecting yarn, or any other floating and sinking structure may be used. However, the insertion of the insertion yarn in the course direction (C direction) is subject to certain restrictions. That is, at least one insert thread is
Stitch 1,1 'and the connecting threads 2 adjacent to the belt-shaped member 3 comprising a stitch 1 _-1 and 1' _-1 strip 3 _-1 formed from
And the connecting yarns of the adjacent strip-shaped members 3 _-1 are crossed so as to partially join (part X in FIG. 1). Similarly, the strip-shaped member 3 _-1 and the strip-shaped member 3 _-2 are also connected by the inserting yarn at the X'portion to form a honeycomb structure.

For example, FIG. 2 is a model view of a section obtained by moving Z and Z ′ in FIGS. 1A and 1B in the direction of the arrow, and shows an intersecting state of the connecting yarn and the inserting yarn in the course direction. Insert thread 6 _-1
(Or 6 _-2 ) is the connecting thread 2 _-1 of the strip-shaped member 3 _-1 (or 3 _-2 ).
(Or 2 _-2 ) is repeatedly inserted into the connecting yarns by repeating floating and sinking, but the inserting yarns 5 correspond to or are adjacent to the strip-shaped member 3 _-1 and the strip-shaped member 3 _-2. Simultaneously intersecting the connecting threads 2 _-1 and 2 _-2 , the band-shaped members 3 _-1 and 3 _-2 are intermittently connected. The floating / sinking structure of the insertion yarn 5 can be arbitrarily selected as long as it is in an intersecting state in which adjacent strip-shaped members are intermittently connected to each other.

Further, the floating and sinking structure of the insertion threads 6 _-1 , 6 _-2 can be selected appropriately. As described above, the plurality of strip-shaped members have a portion to be connected to each other and a portion to be separated from each other by the intersection of at least two insertion yarns 6 _-1 (or 6 _-2 ) and the insertion yarn 5, whereby the honeycomb is formed. It has a structure. Also, at least one insert thread is used to connect adjacent strips together. However, in order to increase the thickness or width of the strip-shaped member and stabilize the shape of the honeycomb core, it is preferable that the number of inserted yarns is as large as possible.

As described above, the floating / sinking structure of the inserted yarn is not regulated at all, but it is desirable to repeat floating / sinking as closely as possible in order to further stabilize the shape of the structure.

Four inserting yarn to 6 _-2-1 6 _-2-4 is used in the example of FIG. 3. Further, 6 _{-2-1 to} 6 _-2-4 form a dense woven structure (in this case, do not intersect with the connecting yarn 2 _-1 ) with _respect to the connecting yarn 2 _-2 for the above reason. In FIG. 3, insert thread 5
_-1, 5 _-2, connecting yarn 2 _-1 respectively X moiety, and ups and downs for both 2 _-2 to knotting the two belt-shaped member. X indicates a connecting portion of adjacent strip-shaped members 3 _-1 , 3 _-2 and Y indicates a non-connecting portion.
Are shown in, At a non-knotting portion, the inserting yarn 5 _-1, strip 3 _-1
And floating and sinking only connecting yarns 2 _-1 constituting the insert yarn _5-2 is floating and sinking only connecting yarns 2 _-2 constituting the belt-shaped member 3 _-2. Although FIG. 3 shows the case where there are two insertion threads for connecting the belt-shaped members,
As described above, two pieces are not necessarily required, and one piece may be used.

In order to maintain the stability of the morphology of the honeycomb core structure and the strength against the shear stress in the thickness direction, it is preferable to increase the number of inserted yarns and to make the floating and sinking structure dense. It may be appropriately selected depending on the application of the honeycomb structure.

As described above, the honeycomb-shaped three-dimensional knitted fabric of the present invention can exhibit various shapes by the adjacent band-shaped members repeatedly connecting and disconnecting. For example, when the section of the bonded portion X has the same length as the section of the non-bonded portion Y, the unit shape of the honeycomb core is a regular hexagon, and the section of the bonded portion X and the section of the non-bonded portion Y are the same. If the length is changed, the hexagonal shape will change at any time. Furthermore, a rhombus-shaped quadrangle can be formed by making the connecting portion one course. Further, the size of the unit polygon forming the honeycomb core structure is determined by the length of the section of the connecting portion and the non-connecting portion, and the length of the section is in the wale direction at the connecting portion and the non-connecting portion. It is determined by the number of continuous loop stitches.

Further, the thickness of the strip-shaped member constituting the honeycomb core structure of the present invention is determined by the number of facing loop-shaped stitch rows, and the minimum is one row, which may be appropriately increased depending on the target structure. For example, in order to increase the compression strength in the thickness direction of the honeycomb core structure, the number of loop stitch rows may be increased and the thickness of the belt-shaped member (direction C in FIG. 1) may be increased. On the contrary, in order to reduce the weight of the honeycomb core structure, the number of loop stitches should be reduced as much as possible.

The material used for the honeycomb-shaped three-dimensional knitted fabric of the present invention is polyester, polyamide, acrylic, synthetic fiber such as aramid,
Not only natural fibers such as wool and cotton, but also fibrous materials such as glass fibers, carbon fibers, and metal fibers that can be knitted may be used.
Further, it may be in the form of filament, spun yarn or tape.

The term "one connecting yarn" as used in the present invention refers to the number of yarns at the points where the loop stitches are joined to join the stitches. When the connecting yarn extends back and forth from this one knot point, the reciprocating yarn is counted as one.

Next, one row of the method for manufacturing a honeycomb-shaped three-dimensional knitted fabric of the present invention will be described.

FIG. 4 shows a view of the needle bed of a warp knitting machine having a two-row needle bed as seen from above. In the two rows of needle beds of this warp knitting machine, the connecting yarn is knitted so as to overlap the corresponding needles (1) and (1 ') in the front and rear, and the loop-shaped stitch and the connecting yarn are formed in the front and rear needle beds. The band-shaped member having the same is knitted in the length direction with the same needle. Needle (2)
(2 '), (3) and (3') are similarly knitted.
Between at least one reed, the insertion threads are inserted in a zigzag manner at intervals of one stitch of the guide, between the connecting threads of all the belt-shaped members arranged in parallel. Furthermore, at least two reeds are inserted in a zigzag manner between the connecting yarns in a 1-in-1-out yarn arrangement. For example, the insertion thread _{5-1 in} FIG. ₁ is the needle (1) (1 '),
(3) Insert a meandering interval between the connecting yarns knitted by (3) (3 ') with one needle of Shog width, and then with two needles of Shog width, needles (0) (0'), (2) (2 ') Insert the connecting thread on the ... side and insert it meanderingly. Further insertion yarns 5 _-1 meandering inserted in the first state shog width 1 needle, followed by the needle (2) (2 '), (4) (4') ... inserting same section meanders entwined connecting yarn . Also, insert thread 5 _-2 is needle (2)
On the basis of the meandering insertion between the connecting yarns knitted by (2 '), (4) and (4'), the meandering insertion is performed in the direction opposite to the inserting yarn 6. By repeating this knitting, the honeycomb core structure of the present invention can be obtained.

As another embodiment of the present invention, the honeycomb-like three-dimensional knit shown in FIG. 1 was knitted using a double raschinyl knitting machine equipped with five reeds L _{1 to} L ₅ . The gauge of the knitting machine was 18 gauge, and the thread shown in Table 1 was used for each reed, and the design was carried out with the construction shown in Table 2. The resulting honeycomb core structure was a hexagonal honeycomb core structure in which the band-shaped members had 4 courses of connecting portions and 3 courses of non-connecting portions, as shown in FIG.

Further, as another example of the present invention, a honeycomb core structure was formed according to the knitting structure shown in FIG. 5, using a double Raschel machine equipped with 7 reeds of L _{1 to} L ₇ . Uses 200 denier aramid fiber for L ₄ and carbon fiber for other reeds 1
800 denier was used. In the obtained structure, the insertion yarn for knotting is supplied from L ₂ and L ₆ , and the two insertion yarns are inserted into one knotting portion, and the insertion yarn that does not act as knotting action is obtained.
It was supplied from L ₁ , L ₃ , L ₅ , and L ₇ , and four insertion yarns were inserted between the connecting yarns of one non-knotted portion. The obtained honeycomb-shaped structure is impregnated with epoxy resin and heated at a set temperature of 120 ° C for 180
Minute dried and cured. The composite material thus obtained was lightweight, the honeycomb core shape of the three-dimensional knit was maintained as it was, and had an extremely high resistance in the thickness direction (A direction) of the honeycomb core.

〔The invention's effect〕

In the honeycomb-shaped three-dimensional knitted fabric according to the present invention, since the honeycomb core itself is formed as an integrated body on the knitting machine, it is not necessary to go through various processes such as conventional adhesion, and there is no problem of partial peeling of the honeycomb core. Furthermore, since the wall plate of the honeycomb core has a woven-like structure composed of meandering insertion of connecting yarn and warp yarn, it has extremely high resistance to compression in the thickness direction,
Good shape retention of three-dimensional shape.

[Brief description of drawings]

FIG. 1 is a model diagram of an embodiment of a honeycomb-shaped three-dimensional knitted fabric of the present invention. FIG. 2 is a model view of the cross-sectional shape when the straight line ZZ ′ in FIG. 1 is moved in the direction of the arrow. FIG. 3 is a model diagram of another embodiment of the present invention. FIG. 4 is a model diagram of a knitting part of a warp knitting machine for manufacturing the structure of the present invention. FIG. 5 is a knitting structure diagram for manufacturing the structure of the present invention. 1,1 ', 1 _-1 , 1, _-2 , 1' _-1,, 1 ' _-2 …… Loop stitch, 2,
2 _-1 , 2 _-2 ...... Connecting thread, 3,3 _-1 , 3 _-2 ...... Strip-shaped member, 5,
5 _-1 , 5 _-2 ...... Insertion thread, 6,6 _-1 , 6, _-2 , 6 _-2-1 , 6 _-2-2 , 6
_-2-3, 6 _-2-4 ...... inserting yarn, X ...... co-woven part, Y ...... non co-woven part, (0), (0 '), (1), (1'), (2 ),
(2 '), (3), (3'), (4), (4 '),
(5), (5 ') ... Knitting needle.

Claims (1)

[Claims] 1. At least one pair of opposing loop-shaped stitch rows, connecting yarns connecting the stitch rows, and at least two insertions inserted between the connecting yarns so as to intersect with the connecting yarns in a crossing direction. A honeycomb three-dimensional knitted fabric, wherein a plurality of strip-shaped members made of yarns are partially connected to adjacent strip-shaped members by the insertion yarns to form a honeycomb shape.