JPS6138697B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION In order to increase the absorption rate, reduce the resistance to withdrawal from the vagina, and make the operation easier, the density at the front and rear ends of the tampon body is lower than that at the center. A method for manufacturing a sanitary tampon with a lower profile, in particular, in order to make the density at the front and rear ends of the tampon body lower than that at the center, the fiber fleece, which is the constituent material of the tampon body, is wrapped at an appropriate angle at both ends in the width direction. The present invention relates to a method for manufacturing a sanitary tampon, which is characterized in that the tampon is rolled into a spiral cylindrical body so as to be shifted.

Conventionally, tampons are known in which the density at the front and rear ends of the tampon body is lower than that at the center, but when molded in this way, the fiber fleece that is the constituent material of the tampon body is compressed at both ends in the width direction. There is no teaching of a convenient and suitable method for winding the coiled cylinder so that the parts are staggered at an appropriate winding angle.

The purpose of the present invention is to provide such a simple and suitable method, and the configuration for achieving the purpose will be described below using the illustrated embodiment.

In FIG. 1, a winding device 2 for a fiber fleece 1 is shown. The winding device 2 consists of a fixed cylinder 4 having slits 3 in the axial direction on both sides, and a rotating winding shaft 5 located at the center thereof and opening and closing like a beak.
The fleece 1 is made of an aggregate of absorbent fibers or a combination of the aggregate with a nonwoven fabric, preferably a nonwoven fabric without using a fiber binder, so as to be located on the outer peripheral surface of the finished tampon body, and the width of the fleece 1 is Both end lines in the direction are substantially parallel and have a constant width. The fleece 1 is inserted into a slit 3 of a cylinder 4 and held between a winding shaft 5, and then wound into a spiral cylindrical body by rotating the winding shaft 5.

FIGS. 2 and 3 show a method for winding the fleece 1 in a spiral shape while shifting both ends in the width direction. That is, as shown in FIG.
The winding shaft 5 (omitted) is located at a first center line 6 on the fleece 1, which is parallel to both widthwise end lines of the fleece 1, which is conveyed on a conveyor (not shown).
is arranged on the upper part of the fleece 1 while maintaining a relative position with the conveyor so that it intersects the second center line 7 on the fleece 1 perpendicular to the winding axis 5 and forms an angle θ ₁ on the winding axis 5 line. . When the fleece 1 is sandwiched between the winding shafts 5 while maintaining this angle θ ₁ and folded back around the winding shaft 5 as shown in FIG. 3, the first center of the overlapping portions 1a and 1b is Lines 6a and 6b intersect on the folding line at an angle θ
₂ = 2θ ₁ .

It is most preferable to fold the fleece 1 in half from approximately the center of its entire length, but it may also be folded from 1/4 to 1/2 of its total length. Furthermore, the angle θ 2 formed by the first center lines 6a and _6b when the fleece 1 is folded back is 1°.
36' to 8°36' is most preferred. Therefore, in that case, the angle θ between the first center line 6 of the fleece 1 and the second center line 7 that intersects the winding axis 5 at right angles.
₁ is 43' to 4°18'. The angle θ ₂ is adjusted depending on the width and length of the fleece 1, but the commonly used fleece 1 has a width of 40 to 55 mm and a length of 200 to 400 mm. Angle θ ₁
If θ is less than 43', both ends of the fleece 1 in the width direction are sufficiently misaligned, and if _θ1 is more than 4°18', the shape of the front and rear end surfaces of the tampon body after molding will be poor, and it will become spiral-shaped. There is a tendency that it cannot be wound stably when it is wound.

When the fleece 1 is wound in a spiral shape as shown in FIG. 4 with the ends in the width direction of the fleece 1 being appropriately shifted in this way, the front and rear ends of the wound cylindrical body 8 are shifted in stages, In this state, when the cylindrical body 8 is compressed using a compression molding device (not shown) so that its diameter is almost uniform over almost the entire length, the density of the front and rear ends 9a and 9b is lowered in the center as shown in FIG. 9
A cylindrical tampon body 9 that is lower than that of c is formed. If the tampon body 9 is compressed only in the radial direction, the front and rear end surfaces of the tampon body 9 will be uneven, but this can be corrected by lightly squeezing the front and rear end surfaces, and if necessary, the front and rear end surfaces can be shaped into a cannonball shape. It may be molded like that of .

Note that the tampon manufacturing method of the present invention does not outline all the steps, so the equipment for all the steps is not shown. The tampon body is continuously unrolled onto the top, a string 10 is hung by a stringing device, wound around a spiral cylindrical body 8 by a winding device 2, and cut into a predetermined length, a cylindrical tampon body is formed by a compression molding device. 9 is compression molded.

According to the manufacturing method of the present invention, as described above, the method of shifting both ends of the spiral cylindrical body before compression molding the tampon body is extremely simple and suitable. This is extremely beneficial as it requires only a simple device to be placed in the area.

[Brief explanation of the drawing]

Fig. 1 is a schematic perspective view of a fiber fleece winding device, Fig. 2 is a plan view showing the relative position of the winding shaft of the device and the fiber fleece, and Fig. 3 shows the fiber fleece in the state shown in Fig. 2. Explanatory plan view when folded back,
FIG. 4 is an explanatory plan view showing the process of winding the fiber fleece in the state shown in FIG. 3 into a spiral cylindrical body, and FIG. 5 is a perspective view of the completed tampon. 1... Fiber fleece, 2... Wrapping device, 3...
Slit, 4... Fixed cylinder, 5... Shaft with rotating winding,
6, 6a, 6b...first center line, 7...
Second center line, 8... Spiral cylindrical body, 9...
...tampon body, 10... string.

Claims (1)

[Scope of Claims] 1. A winding device having at least a movable winding shaft is placed on a conveyor to transport a fiber fleece having a constant width with substantially parallel both end lines in the width direction. A first center line on the fleece parallel to both end lines in the width direction intersects a second center line on the fleece perpendicular to the winding axis on the winding axis to form an angle θ ₁ . When the fleece is folded around the winding shaft in a state in which the fleece is folded, the first center line of the overlapping part of the fleece due to the folding intersects on the folding line to form the angle θ _1. The fleece is wound into a spiral cylindrical body by shifting the first center line so as to form an angle θ ₂ twice as large as A tampon body is formed by squeezing the tampon body so that its diameter is approximately uniform over almost the entire length, thereby making the density at the front and rear ends of the tampon body lower than that at the center. tampon manufacturing method. 2. The method for manufacturing a sanitary tampon according to claim 1, characterized in that the angle θ ₂ is between 1°26' and 8°36'.