JP2008208471A - Felt needle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a felt needle capable of suppressing damage to yarns composing a woven fabric and preventing carrying in of the yarns into the interior of a nonwoven fabric while achieving high interlacing of a nonwoven fabric part when the nonwoven fabric is integrated with the woven fabric by needle punching. <P>SOLUTION: The felt needle has one or more barbs 5 being ≥0.040 and ≤0.100 mm depth defined by a bottom part and a tip part and formed on the same ridge line of a blade. In the felt needle, the barb tip angle α of the barbs is ≥80 to ≤120°. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention provides a felt needle, in particular, when a nonwoven fabric and a woven fabric are integrated by a needle punch, while achieving high entanglement of the nonwoven fabric portion, suppressing damage to the yarn constituting the woven fabric, and introducing the yarn into the nonwoven fabric. It is related with the felt needle which can prevent carrying in.

Felt needles are used to obtain non-woven fabrics, with the shaft portion, intermediate blade, blade and needle tip to be clamped and fixed as main components, and barbs called barbs as important working parts of the non-woven fabric. When the felt needle is inserted, the spine hooks and moves the fiber to entangle it to form a nonwoven fabric (Patent Document 1).
With regard to nonwoven fabric production, the required characteristics are increasing year by year. For example, for nonwoven fabric production for artificial leather substrates, the final product artificial leather is aesthetically pleasing and can be used practically. This is a difficult field that must be achieved with the same characteristics.

  In order to improve the aesthetics of artificial leather and improve the strength and durability, generally, the entanglement of the fibers constituting the nonwoven fabric that is the base material must be increased. For this purpose, it is necessary to increase the degree of entanglement by increasing the needle punching effect such as increasing the number of needles with felt needles or increasing the barb size of the felt needles used in the production of the nonwoven fabric. However, there is a conflicting problem that product quality deterioration such as the appearance of needle traces and needle streaks occurs with the entanglement.

  As a technique for improving the strength and durability of artificial leather, a method for producing artificial leather in which ultrafine fibers and a strongly twisted knitted fabric are inseparably integrated is proposed. According to the present technology, by applying a knitted fabric with a strong twisted yarn of 700 T / m or more, damage of the knitted fabric constituting yarn can be suppressed when the nonwoven fabric and the knitted fabric are entangled with a felt needle. However, it is still not sufficient in terms of achieving both the entanglement of the nonwoven fabric and the maintenance of the reinforcing effect of the knitted fabric. (See Patent Document 2).

  In addition, in order to achieve an improvement in the degree of nonwoven fabric entanglement and maintenance of the knitted fabric reinforcement effect, by defining the relationship between the diameter of the yarn constituting the knitted fabric to be overlapped and the barb depth of the felt needle, And a technique for achieving both the reinforcing effects of the knitted fabric. (Refer to Patent Document 3) According to the present technology, the conflicting problems of improving the entanglement of the nonwoven fabric portion and maintaining the reinforcing effect have been solved. In some cases, the thread to be exposed is exposed.

  This is because the yarn that makes up the knitted fabric is not damaged by the needle punching with the felt needle, but it is brought into the thickness direction by the barb and exposed to the product surface. Compared with the extra fine yarn that makes up artificial leather The appearance of the thick and thick knitted fabric constituent yarn on the surface of the product caused a defect in appearance or a problem of deterioration in touch.

Further, in the present technology, since the relationship between the barb size of the felt needle and the diameter of the knitted fabric constituent yarn is defined, there are restrictions on the entangled design of the nonwoven fabric portion and the design of the reinforcing knitted fabric constituent yarn to be inserted.
JP-A-7-331575 JP-A-62-78281 Japanese Patent Laid-Open No. 3-82858

  The present invention relates to felt needles, in particular, when a nonwoven fabric and a knitted fabric are integrated by a needle punch, while suppressing the damage of the yarn constituting the knitted fabric while achieving high entanglement of the nonwoven fabric portion, and the nonwoven fabric of the constituent yarn An object of the present invention is to provide a felt needle that can be prevented from being brought into the interior.

  The present invention has the following configuration in order to solve the above problems.

  That is, in the felt needle in which one or more barbs are formed on the same ridge line of the blade, the barb tip angle α is 80 ° or more and 120 ° or less.

  According to the felt needle of the present invention, when the barb tip angle α is set to 80 ° or more and 120 ° or less, when the nonwoven fabric and the fabric are entangled and integrated with each other by the needle punch, high entanglement of the nonwoven fabric portion is achieved. However, it is possible to drastically suppress the damage of the fabric constituting yarn and prevent the yarn from being brought into the nonwoven fabric.

  As a result of intensive studies to meet the demand for advanced nonwoven fabric processing, the present inventors have reached the present invention. Details of the present invention will be described below.

  In order to solve the above-mentioned problems, the present invention is such that in a felt needle in which one or more barbs are formed on the same ridge line of the blade, the barb tip angle α is 80 ° or more and 120 ° or less.

  First, the felt needle referred to in the present invention will be described with reference to FIG. The felt needle 1 basically includes a blade 2 having a barb 5 formed on a ridgeline, an intermediate blade 3, and a shaft portion 4 for fastening and fixing a felt needle to a needle board. There can be one barb or multiple barbs. In a plurality of cases, the barbs need to be on the same ridgeline in order to achieve the desired effect described later. That is, in order to increase the barb tip angle α and to exhibit the effect that the portion represented by the blade side surface (barb side surface) 10 spreads the yarn constituting the woven fabric to the outside, to suppress damage to the yarn, the barb is on the same ridgeline. It is important to be in

  Further, the intermediate blade 3 may be omitted.

  Next, barbs will be described. FIG. 2 shows an enlarged view of the barb 5 in FIG. 1 as seen from the side. In general, the barb 5 is provided on one ridge line of the blade 2 and has a wedge shape defined by the barb tip 6 and the barb bottom 7, and the barb depth c as a whole is determined from the blade ridge line L to the barb tip 6. Is expressed as the sum of the kick-up a expressed by the height up to and the throat depth b expressed by the depth from the blade ridge line L to the barb bottom 7. That is, barb depth c = kick-up a + throat depth b. The kick-up a may be zero, or may be a minus kick-up in which the barb tip 6 is positioned below the blade ridge line L.

In FIG. 2, a wedge-shaped barb called a cut barb is shown, but a known shape such as a box-shaped barb can be adopted, and a known means such as die press or cutting is used as a means for forming the barb. I can do it.
FIG. 3 shows an enlarged sectional view of the barb 5 of the felt needle according to the present invention. 3 is an enlarged vertical cross-sectional view taken along the line II in FIG. 2, but the barb bottom 7 is also shown for convenience (the same applies to other barb enlarged cross-sectional views).

  In order to achieve the desired effect, the barb tip angle formed by the straight line M defined by the width of the barb tip 6 (barb tip width) d and the width of the barb bottom 7 (barb bottom width) e. It is necessary that α is 80 ° or more and 120 ° or less. It is preferably 90 ° or more and 120 ° or less, and more preferably 95 ° or more and 120 ° or less.

  The action of the needle in the present invention will be described with reference to FIGS.

  4 to 5 schematically illustrate the relationship between the fabric structure and felt needle barb during processing in the process of needle punching by overlapping the woven fabric and the nonwoven fabric to form a non-separable integrated structure. The woven warp is designated 8 and the weft is designated 9.

  The felt needle according to the present invention is most effective when felt processing is performed by setting the acute angle β formed by the center line N that bisects the barb and the line P that represents the symmetry of the fabric to 45 °. . This is because as β is smaller than 45 °, the barb is likely to be caught by the weft yarn, and as β is larger than 45 °, the barb is likely to be caught by the warp yarn. In any case, the constituent yarn is easily damaged and is easily brought into the nonwoven fabric. . Therefore, since needle punching is generally performed at β = 45 °, β = 45 ° is also set in FIG. However, since the optimum angle varies depending on the tip angle and the needle cross-sectional shape, the present invention is not limited to the angle β.

  When the felt needle is inserted at β = 45 °, when the barb tip angle α is small, the barb is caught by the warp or weft as shown in FIG. 9 and the yarn is damaged or brought into the nonwoven fabric, as shown in FIG. As described above, when the barb tip angle α is large, the portion represented by the blade side surface (barb side surface) 10 exerts the effect of spreading the fabric constituting yarn outside, and the yarn damage can be suppressed. Furthermore, if the barb tip angle α is 80 ° or more, it becomes very difficult for the barb of the felt needle to enter the warp yarn, the weft yarn, and the corners formed by them (hereinafter collectively referred to as the yarn region). If the angle exceeds 90 °, the barb cannot substantially enter the yarn region. For this reason, the barb does not get caught in the fabric constituting yarn, and by pulling it, it is possible to drastically suppress the yarn from being damaged or brought into the nonwoven fabric.

  FIG. 5 shows the effect of a felt needle having a barb tip angle α of 120 °. It can be seen that if the tip angle α is increased, the effect of suppressing damage and carry-in of the fabric yarn by the barb is further enhanced.

  On the other hand, if the tip angle α is made too large, the cross-sectional area of the barb (the cross-sectional area of the blade) and the cross-sectional area of the intermediate blade tend to increase, which may cause deterioration in needle marks and streaks. And the entanglement effect decreases.

  Therefore, the barb tip angle α is desirably 80 ° or more and 120 ° or less, preferably 90 ° or more and 120 ° or less, and more preferably 95 ° or more and 120 ° or less.

  Moreover, various shapes can be adopted for the shape of the barb section of the felt needle. The felt needle shown in FIG. 3 has a polygonal cross section of the barb, but it is sufficient to have at least one ridgeline in order to provide the barb, and otherwise there is no particular limitation. In addition to the cross-sectional shape of FIG. 3, for example, various cross-sectional shapes as shown in FIGS. 6A to 6C can be adopted. The felt needle shown in FIG. 6 (a) has a blade cross section composed of a combination of a curve and a straight line. In (b), the barb tip angle α satisfies 80 ° or more and 120 ° or less, but the portion below the barb is an acute angle. (C) is composed mainly of curves except for the barb portion. The action of these felt needles on the woven fabric is shown in FIGS. 7 (a) to 7 (c). In each needle, the working portion (blade side surface 10) that pushes the woven fabric yarn is effective, and the woven fabric yarn of barb becomes effective. It can be seen that the interference can be avoided.

  From the above, when the barb tip angle α is 80 ° or more and 120 ° or less, preferably 90 ° or more and 120 ° or less, and more preferably 95 ° or more and 120 ° or less, the design of the other parts of the felt needle is as follows. In order to avoid defects such as needle marks and vertical lines, and fiber cutting at the corners, any shape can be adopted as long as it conforms to a normal felt needle design. On the other hand, FIG. 8 shows a felt needle having a barb tip angle α = 60 ° as an example of a prior art felt needle. FIG. 9 shows the action of this prior art barb. Even if the felt needle is inserted with β = 45 °, the effect of the portion (blade side surface 10) for spreading the fabric constituting yarn is low, and the barb It can be seen that it can easily enter the yarn area of the fabric. For this reason, the fabric constituting yarn is caught by the barb, causing damage to the yarn or bringing it into the nonwoven fabric.

  In the felt needle of the present invention, it is desirable that the barb depth c defined by the barb bottom and the tip is 0.040 mm or more and 0.100 mm or less. When the barb depth c is small, it becomes difficult to hook the nonwoven fabric constituting fibers, and it is not preferable because sufficient entanglement formation is difficult. On the other hand, when the barb depth c is increased, the distance between the barb tip 6 and the action part (blade side surface 10) that spreads the fabric constituent yarn is increased, the degree of freedom of the fabric constituent yarn is increased, and the barb is easily bent. In addition to the possibility of the introduction and damage of the constituent yarns due to the non-woven fabric, the nonwoven fabric surface tends to cause deterioration in surface quality such as needle marks and needle lines, which is not preferable.

  From the above, it is desirable that the barb depth is 0.040 mm or more and 0.100 mm or less, and more preferably 0.040 mm or more and 0.080 mm or less.

  The felt needle in the present invention preferably has a barb tip width d of 0.050 mm or more and 0.150 mm or less. If the barb tip width d is too narrow, the entanglement effect of the nonwoven fabric is lowered, which is not preferable. If the width d of the barb tip is too wide, the distance between the barb tip 6 and the action part (blade side face 10) that spreads the fabric constituent yarn becomes long, the degree of freedom of the fabric constituent yarn increases, and it becomes easy to bend. In addition, the possibility of yarn being brought in or damaged by the yarn increases, and the nonwoven fabric surface tends to cause deterioration in surface quality such as needle marks and needle streaks. From the above, it is desirable that the barb tip width d is 0.050 mm or more and 0.150 mm or less, and more preferably 0.050 mm or more and 0.120 mm or less.

  In the present invention, the barb tip 6 and the barb bottom 7 may be tapered as shown in FIG. In the case of such a felt needle, a deemed barb tip 6 ', defined by a line perpendicular to the barb bisector N and passing through the lowest point of the barb tip 6, is guided in a similar manner. The barb tip angle α can be determined using the assumed barb bottom 7 ′, and the same effect can be obtained if this value satisfies the range of 80 ° to 120 °.

  In the present invention, the cross-sectional shapes of the barb and the other blade portions may be different. For example, only the peripheral portion of the barb may have the cross-sectional shape shown in FIG. 3, and the other blade portions may have a round cross-section.

  Further, in the present invention, there may be a plurality of barbs. When a plurality of barbs are provided, all the barbs need to be on the same ridgeline in order to exhibit the above-described effects.

The whole figure of one mode of the felt needle of the present invention. The expanded side view of the one aspect | mode of the barb part of the felt needle | hook of this invention. The barb part cross-sectional enlarged view of the one aspect | mode of the felt needle | hook of this invention. The figure which shows the effect | action of the felt needle | hook of this invention in the bonding process of a textile fabric and a nonwoven fabric. The figure which shows the effect | action by another one aspect | mode of the felt needle | hook of this invention in the bonding process of a textile fabric and a nonwoven fabric. The barb part cross-sectional enlarged view which shows another aspect of the felt needle | hook of this invention. The figure which shows the effect | action by another aspect of the felt needle | hook of this invention shown in FIG. 6 in the bonding process of a textile fabric and a nonwoven fabric. 1 is a diagram of an example of a prior art felt needle. The figure which shows the operation | movement relationship in the bonding process of a textile fabric and a nonwoven fabric by the felt needle | hook of a prior art. The figure which shows the calculation method of the barb front-end | tip angle (alpha) when a taper exists in a barb front-end | tip part or a barb bottom part in this invention.

Explanation of symbols

1 Felt Needle 2 Blade 3 Intermediate Blade 4 Shaft 5 Barb 6 Barb Tip 6 ′ Considered Barb Tip 7 Barb Bottom 7 ′ Considered Barb Bottom 8 Fabric Constructing Warp 9 Fabric Constructing Weft 10 Barb Constituent Thread Does Not Enter That acts like (blade side)
a Kick-up (length from blade ridge to barb tip)
b Throat depth (length from blade edge to barb bottom)
c Sum of kick-up and throat depth (length from barb tip to barb bottom)
d Barb tip width e Barb bottom width L Blade ridge line M Two straight lines N defined by barb tip width and bottom width Straight line P that bisects barb Straight line α showing fabric symmetry Barb tip angle formed by two straight lines M An acute angle formed by a straight line N that bisects β barb and a straight line P that represents fabric symmetry

Claims (5)

  A felt needle in which one or more barbs are formed on the same ridge line of a blade, wherein the barb tip angle α of the barb is 80 ° or more and 120 ° or less.   The felt needle according to claim 1, wherein the barb tip angle α is not less than 90 ° and not more than 120 °.   The felt needle according to claim 1 or 2, wherein a barb depth defined by a barb bottom and a tip is 0.040 mm or more and 0.100 mm or less.   The felt needle according to any one of claims 1 to 3, wherein a barb tip width is 0.050 mm or more and 0.150 mm or less.   The felt needle according to any one of claims 1 to 4, wherein the felt needle is used when the nonwoven fabric and the woven fabric are formed into an integral structure.

Images