JPS63159556A - Sandwich like panel knitted article - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a sandwich-like panel knitted fabric made of fiber aggregates.

[Conventional technology]

In recent years, composite materials using fiber materials have come to be widely used not only in products in the aviation and military fields, but also in various structural materials for everyday items. In particular, Santoifuchi panels are often used in areas that require light weight, high strength, and high rigidity.

However, conventional sandwich panels are manufactured by sandwiching the core material that forms the intermediate layer between two panels and gluing them together to integrate them. Due to the difference in coefficient of thermal expansion, they had problems such as being susceptible to sudden temperature changes.

[Problem that the invention seeks to solve]

An object of the present invention is to solve the problems of conventionally known sandwich panels and to provide a sandwich-like panel knitted fabric as a base material capable of producing a sandwich panel that is resistant to peeling (and resistant to temperature changes).

[Means for solving problems]

The object of the present invention is to provide a three-dimensional knitted fabric in which two warp knitted fabric sheets facing each other are connected by a connecting yarn, the two-dimensional warp knitted fabric sheets forming a diagonal to the connecting yarn between the two warp knitted fabric sheets, Further, an insertion yarn inserted substantially parallel to the sheet surface of the warp knitted fabric is crossed with the connecting yarn so as to exhibit a knitted structure with ups and downs to form a wall portion, and the connecting yarn is inserted against the sheet surface. This is achieved by means of a sandwich-like panel knitted fabric, characterized in that the partial arrangement forms cavities between the wall parts.

The inserted yarn is inserted in the wale direction or course direction, and further in an oblique direction as necessary, in a plane substantially parallel to the warp knitted fabric sheet surface, and intersects with the connecting yarn according to the arrangement of the corresponding connecting yarn, A kind of knitted structure is formed to form the wall.

The connecting yarn may be the base yarn itself that forms the stitches of the sheet, or may be an additional yarn dedicated to connection that is independent of the base yarn and used as the connecting yarn. That is, the connecting yarn may connect the front and back sheets and form loop-like stitches of the sheets at the same time, or it may be another yarn that is simply caught in the loop-like stitches of the front and back sheets.

In the warp-knitted fabric sheet, a plurality of warp-knit stitches extending in the wale direction are connected in the course direction to form one knitted fabric. Generally, warp knitted fabrics are connected in the wale direction with needle loops to form a warp stitch stitch, and connected in the course direction with sinker loops to form a single piece of fabric. Alternatively, another yarn may be inserted as a weft and connected in the course direction. In addition, in order to reinforce the warp knitted fabric, it is desirable to use a weft insertion yarn and/or a warp insertion yarn between the needle loop and the sinker loop. The connecting threads should not be connected over the entire surface but only partially. In other words, if one set of connecting yarns is connected for each stitch forming a warp knitted fabric sheet, it is considered to be a full connection, but in the sandwich-like panel knitted fabric according to the present invention, it is not a full connection but a partial connection, and a plurality of It is formed in a structure in which one set of connecting threads is connected to one stitch among the stitches. Therefore, the number of pairs of connecting yarns is smaller than the number of stitches of the warp knitted fabric sheet, and the ratio is 9.
It is in the range of 0% to 5%.

In order to reduce the weight of the sandwich-like panel fabric, the ratio of the number of sets of connecting yarns to the number of stitches of the warp knitted fabric sheet is more preferably 40% to 10%. The connecting thread is 1
Since two threads are connected to one stitch, a set of linking threads in the present invention means two linking threads.

The connection pattern of the connecting yarns in the sandwich-like panel fabric according to the present invention is not particularly limited, but the connecting yarns are regularly inserted into the fabric-like structure by inserting the yarns so that the cross-sectional shape of the panel fabric exhibits a logo-shaped cross section. Preferably, a wall is formed.

Furthermore, the planar pattern of the partition wall arrangement when the panel fabric is viewed from above is not particularly limited, and a planar pattern that appropriately determines the partition wall placement depending on the direction of rigidity required to be imparted to the panel fabric is adopted. do it.

The present invention will be described in detail below with reference to the accompanying drawings showing an embodiment of the sandwich-like panel knitted fabric according to the present invention.

FIG. 1 is a perspective view schematically showing the structure of a part of an embodiment of the sandwich-like panel knitted fabric according to the present invention. In the figure, two opposing warp knitted fabric sheets 5.5' are each 6
The warp stitch stitches of the rows are connected by sinker loops of the yarn forming the stitches to form one sheet. 1-1~1
-6 indicates the warp stitch stitch density forming the warp knitted fabric sheet 5, among which two sets of connecting yarns 2-, , L,
It is connected to the opposing warp knitted fabric sheet 5' by. 2
1Jl of connecting threads, L, are formed along the wale direction, and this connecting thread group 2. ．． Insert thread 3-3 to 12
3-s is inserted while rising and falling for each course, and the meandering form of the inserted threads 3-1.3-3.3-s and the inserted threads 3-z and 3-n is symmetrical, creating a kind of woven structure. is formed.

Figure 2 shows the structure shown in Figure 1 in one unit.

An example is shown in which the units are continuous along the wale direction of a sandwich-like panel knitted fabric and connected along the course direction. In the figure, numerals 4-1 to 4-6 indicate partition walls each having a wall portion formed of connecting threads and insertion threads. The plane pattern of this sandwich-like panel knitted fabric is shown in 3rd (a).
As shown in the figure.

FIG. 4 shows a sandwich-like panel knitted fabric in which partition walls made up of connecting yarns and inserted yarns are formed in a honeycomb shape, and FIG. 5 is an enlarged model diagram of a knitted fabric sheet 5 of the panel knitted fabric. . In the figure, 6 indicates a stitch in the knitted fabric sheet 5 to which the connecting yarn is connected, and 7 indicates a stitch in the belonging fabric sheet 5 to which the connecting yarn is not connected. By arranging the stitches 6 in a hexagonal shape as shown in FIG. 5, a sandwich-like panel knitted fabric in which partition walls are formed in a honeycomb shape as shown in FIG. 4 can be obtained. The planar pattern of this panel knitted fabric is shown in FIG. 3(b).The panel knitted fabric with such a planar pattern has a well-balanced rigidity, similar to the panel knitted fabric with the planar pattern shown in FIG. 6(C). has.

〔Example〕

Using a double raschel machine with 12 reeds shown as L, ~L, and t, using the threads used and the threading conditions shown in Table 1, and with the knitting structure shown in Figure 6, a sandwich shape with a honeycomb planar pattern was fabricated. A panel knitted fabric was knitted. The knitting machine gauge used at this time was a 14 gauge specification, and the hook interval was set to llm-.

The resulting sandwich-like panel knitted fabric had the appearance shown in FIG. 4 and had a thickness of 10 fins. This knitted fabric was impregnated with epoxy resin at a weight ratio of 60% and heated at 150°C for 3 hours.
A lightweight sandwich panel was obtained by curing under the conditions of r.

Below is the margin Table 1 (Note) Work Setting the yarn 2 Offcenting the yarn [Effects of the invention] In the sandwich-like panel knitted fabric of the present invention, both the core part and the panel part of the conventional sandwich panel are formed of fiber aggregates. The fiber threads are intricately intertwined and integrated inside the fiber aggregate. For this reason, the core part and the panel part do not separate until the fibers are cut. In addition, the core part and the panel part can be made of the same material, so that deformation and covering of the panel due to differences in thermal expansion coefficients will not occur. Furthermore, since the structure of the sandwich-like panel knitted fabric of the present invention is formed all at once during the knitting process, even panel knitted fabrics with complex shapes can be easily and industrially manufactured.

[Brief explanation of the drawing]

FIG. 1 is a perspective view schematically showing the structure of a part of an embodiment of the sandwich-like panel knitted fabric according to the present invention, and FIG. 2 is a sandwich-like panel formed by connecting the structures shown in FIG. 1. 3(a), 3(b), and 3(a) are perspective views showing an example of a knitted fabric; FIG.
C) Figure 4 is a plan view showing different plane patterns of the walls of the sandwich-like panel knitted fabric, and FIG. FIG. 5 is an enlarged plan view of the knitted fabric sheet of the panel knitted fabric shown in FIG. 4, and FIG. 6 is a knitting structure diagram of one embodiment of the sandwich-like panel knitted fabric according to the present invention. 1-+ ~ 1-6... Warp stitch ratio, 2-+, 2-t... Connecting yarn set, 3-, ~3-6... Insert yarn, 4-, ~4-6. ...Partition wall consisting of wall section, 5.5'...
・Knitted fabric sheet, 6... Stitches in the knitted fabric sheet where connecting yarns are connected, 7
...Stitches in a knitted fabric sheet where connecting yarns are not connected. Figure 2 (b) Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] A three-dimensional knitted fabric formed by connecting two warp knitted fabric sheets facing each other with a connecting yarn, the two warp knitted fabric sheets forming a diagonal to the connecting yarn and having a warp knitted fabric sheet surface between the two warp knitted fabric sheets. forming a wall portion by intersecting the insertion yarn inserted substantially parallel to the connecting yarn so as to exhibit a knitted structure with ups and downs, and partially arranging the connecting yarn with respect to the sheet surface. A sandwich-like panel knitted fabric characterized in that a cavity is formed between the wall portions.