JP5266586B2 - Silence splitter for wide stretched film - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a splitter for a wide width stretched film having a high silencing effect in a split process, capable of reducing the generation of a small crack as a defect generated in splitting, and capable of reducing a split tension to enhance splitting performance, in the splitter (linear splitting tool) for manufacturing a wide width split web by splitting the wide width stretched film stretched uniaxially along a longitudinal direction (vertical direction). <P>SOLUTION: This silenced splitter for a wide width stretched film is a rotor comprising a polygonal column of polygonal cross section, is formed screw-thread-likely with a large number of cutting edges in a ridge line part of a polygon thereof, and is formed spirally crookedly with a rod-like ridge line part having a polygonal cross section. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a splitter (split tool) for producing a wide split web by splitting a uniaxially stretched wide stretched film in the length direction (vertical direction), and in particular, has a high silencing effect in the splitting process. The present invention also relates to a silencer splitter for a wide stretched film that has a good split property by reducing the occurrence of small cracks as disadvantages that occur during splitting and by reducing split tension.

  The production of a wide split web (wide web) by splitting a wide stretched film into a net shape is mass-produced as a raw material for the weft-orthogonal nonwoven fabric obtained by widening and stretching the net body. As a typical example of such a splitter, a wide stretched film is provided on the periphery of the rod-shaped body that rotates at a high speed by providing a large number of thread-shaped blades at the ridge line of the rod-shaped body having a polygonal cross section (polygonal column). The method of splitting by running is often adopted because of its good splitting property. When a wide film is run on the periphery of such a polygonal rod-shaped body that rotates at a high speed, the film is struck between the wide film and the flat portion of the splitter (between adjacent ridges), and the slap is This produces a loud sound. In recent years, environmental conditions have become severe, and it has become an important technical problem to eliminate noise generated in the manufacturing process. As a means for solving this noise, a splitter has been proposed in which a convex receiving member is provided on the flat surface portion (between adjacent ridge line portions) of the polygonal column, thereby reducing the roughness and reducing the sound. (Japanese Patent Laid-Open No. 5-111907). However, even in this method, the rattling is not completely eliminated, and a groove is formed between the blade and the convex receiving member, so that sound is reflected in the groove and the silencing effect is limited. It was.

JP-A-5-117907 (first page, FIGS. 1 and 5).

  The present invention has been made to eliminate the above-mentioned problems, and an object of the present invention is to propose a splitter having a large silencing effect in splitting a wide stretched film. Another object of the present invention is to suppress the flaking of the wide film on the splitter and to reduce small cracks as defects entering the manufactured net. Another object of the present invention is to provide a splitter that can be split even with a small split tension. Another object of the present invention is to provide a splitter in which the accumulation of resin powder as a cutting powder is small even when split for a long time.

The present invention has been made to overcome the problems of the prior art described in the background art, and features of the manufacturing apparatus of the present invention will be described below. The present invention is a rotating body composed of a polygonal column with a polygonal cross section, and a plurality of blades are formed in a thread shape on the polygonal ridgeline portion, and the ridgeline portion of the rod-shaped body with a polygonal cross section is a spiral shape The present invention relates to a sound deadening splitter for a wide stretched film, characterized in that it is formed by twisting it. The present invention also relates to the silencer splitter for wide stretched films, wherein the spiral angle is 2 degrees or more and 60 degrees or less. The present invention also relates to the silencing splitter for wide stretched film, wherein the polygon of the cross section is a 5-10 square. The present invention also relates to the silencer splitter for wide stretched films, wherein the apex of the portion forming the blade of the ridge line portion has a parallel portion of 2-12 mm. The present invention also relates to the above-described silencer splitter for wide stretched films, wherein at least one end of the portion forming the blade of the ridge line portion has a cut portion in a direction perpendicular to the polygonal surface. The present invention, threads formed in the shape blade of the ridge portion is left on the left and right from the center of the splitter are formed in different directions right, about the Hirohaba stretched film for silencing splitter. In addition, the present invention relates to the silencer splitter for wide stretched film, wherein a helical twist provided in a ridge line portion of the rod-like body is formed in a direction different from leftward and rightward from the center of the splitter. . Furthermore, the present invention relates to the silencing splitter for wide stretched film, wherein a protrusion is formed between adjacent ridgelines of the polygonal column.

  The present invention relates to a splitter for producing a wide reticulated web by splitting a wide uniaxially stretched film. The split process of a wide stretched film is particularly noisy, and although various sound reduction means have been tried, there is actually no effective means. Here, the wide stretched film is a width in which generation of noise is particularly problematic, and a film of 50 mm or more, preferably 200 mm or more, most preferably 500 mm or more, and 2,000 mm or less is the most important practically. is there. Therefore, splitting in a normal stretched tape of about 10-25 mm is not targeted.

  The splitter of the present invention is a rod-shaped body having a polygonal cross section. A large number of screw-shaped blades are provided on the ridgeline of the polygonal column, and the film comes into contact with the blades of the ridgeline, so that the split property is good. The polygon is preferably a 5-10 polygon, and more preferably a 6-8 octagon. In the triangle and the quadrangle, the difference in height between the ridge line and the plane in the high-speed rotation of the splitter was too large, the vibration was too intense, and the split web was easily cracked. In addition, when the shape exceeds 10 decagons, the split property is poor, and with a splitter having the same diameter, it is difficult to increase the length of the branch of the net-like body to be manufactured.

  The splitter according to the present invention is effective when the contact angle with the wide stretched film is a certain value or more in the splitting process. The contact angle is 10 degrees or more and preferably 150 degrees or less, more preferably 30 or more and 90 degrees or less. If it is less than 10 degrees, no sound is accumulated, so the noise is small, but in order to form a mesh with a certain branch length, it is necessary to increase the number of rotations, and cracks are likely to occur, which is not practical. . On the other hand, if it exceeds 150 degrees, fluff and powder due to friction are likely to be generated on the wide web of the product, and cracks increase. The splitter of the present invention also has a greater silencing effect at the contact angle.

  The splitter according to the present invention is characterized in that the ridge line portion of the polygonal column is twisted into a spiral shape. Since the ridgeline is twisted and the wide stretched film and the splitter have a constant contact angle in the process, any part in the width direction of the wide film is always in contact with the ridgeline during the rotation of the splitter, as in the conventional case In the splitter, the film is rarely tamed. The helical angle is preferably 2 degrees or more and 60 degrees or less, more preferably 5 degrees or more and 45 degrees or less. This helical angle is determined by the width of the film, the diameter of the splitter, the number of ridges in the polygonal column, the ratio of the surface speed of the splitter to the traveling speed of the film, the contact angle with the film, and the like.

The ridge portions of the splitter of the present invention are numerous blades cut the threads form, it has a twenty blades from 0.5 fibers per 10 mm. The screw angle is less than 1 degree, and is a minute angle that goes around 0.5-2 mm after one round. And it is desirable for the part in which the blade of this ridgeline part is formed to have a parallel part of 2-12 mm.

  Moreover, the splitter of this invention can have a notch part at a perpendicular | vertical direction to a polygonal surface in the at least one edge part of the part which forms the blade of the ridgeline part of a splitter. By having such a cut portion, the split property is improved, and the split can be performed with a low tension, and therefore, the cracks entering the film are reduced.

  In the present invention, the blade formed in a thread shape on the ridge line portion may be formed in a direction different from the left direction and the right direction from the center portion of the splitter. By doing in this way, in the manufactured reticulated web, the trunk can be a web that is traveling in different directions on the left and right sides from the central portion, and the turn roll or the like travels unevenly when the reticulated web travels. There are no harmful effects.

  The helical twist provided at the ridge line portion of the splitter of the present invention can be formed in a direction different from the left direction and the right direction from the center portion of the splitter. By doing so, it is possible to prevent the wide film from being unidirectionally pressed during the splitting process, and it is possible to prevent small cracks entering the wide split web that is the product.

  It can also be set as the shape in which the projection part was formed between the adjacent ridgeline parts of the splitter which consists of a polygonal column in this invention. When the spiral angle formed by the ridge is large, the split wide film runs on the splitter and undulates, and small cracks are likely to enter. Can be prevented.

  The splitter according to the present invention is a prismatic prism having a polygonal cross section, the ridge line portion is twisted in a spiral shape, and no groove is formed on the surface of the prism. As described above, since the splitter of the present invention has no grooves, no sound is trapped, and the wide stretched film does not slap on the splitter, so that the noise generated when splitting can be reduced. In addition, the blade formed in the ridge line part is cut in an oblique direction with respect to the direction in which the film enters, so that the cutting is good, the effect of being split with a small tension, and the split ratio is low. The effect is that even films with poor properties can be split. Further, since there is no backlash and the split tension is small, the frequency of occurrence of small cracks, which is another problem, can be reduced. Furthermore, when the splitter is operated for a long time, resin powder as swarf accumulates on the blade and prevents the splitting. There is also an advantage that powder does not accumulate easily.

The front view of the splitter of this invention. Sectional drawing in the AA of FIG. Sectional drawing on the CC line of FIG. 1 which shows the blade provided on the ridgeline of the splitter of this invention. Sectional drawing on the AA line of FIG. 1 which shows one of the blades provided on the ridgeline of the splitter of this invention. Fig. A is a plan view of one blade of the splitter of the present invention, and Fig. B is a plan view of one blade of a conventional splitter. The top view which shows the other example of one blade of this invention splitter. Sectional drawing which shows the process of splitting a wide film with the splitter of this invention. The conceptual diagram which shows the net-like web by which the wide stretched film was split by the splitter of this invention. Front view of a splitter showing that thread-shaped blades provided in splitter is thread-shaped blade in the opposite direction than in the left-right center portion of the splitter of the present invention. The front view of the splitter which is provided in the splitter of this invention and shows that the helical twist of the ridgeline part is twisted in the opposite direction from the center part of the splitter. Sectional drawing which shows the example in which the projection part is formed between the adjacent ridgeline parts in the polygonal column of the splitter of this invention.

  FIG. 1 is a front view showing a splitter of the present invention. The splitter 1 is a polygonal column having a polygonal cross section, and includes ridge line portions 2a, 2b, 2c,... And plane portions 3a, 3b, 3c,. The number of ridge line portions 2 is the number of vertices of a polygon, and is hexagonal in the figure, so the number of ridge line portions is also six. The same applies to the number of the planar portions 3. The present invention is characterized in that the polygonal ridgeline portion 2 is twisted in a helical shape at an angle Ψ with respect to the axial center line CC of the polygonal column. The cross-sectional view of the splitter 1 in the AA direction is a polygon (in this figure, a hexagon) as shown in FIG. 2, and the diagonal length is R. On the ridge 2, a blade 4 is cut like a screw thread. In FIG. 1, the blade 4 is shown only on one ridge line portion because it is complicated, but all the ridge line portions have the blade 4. A part of the cross section of the blade 4 on line CC is enlarged and shown in FIG. In the ridgeline part 2, it cuts in with the depth h, and the blade 4 is formed. Both ends of the shaft of the splitter 1 have attachment terminals 5a and 5b that are rotatably attached to bearings and the like, and are forcedly driven at these portions to rotate.

  FIG. 4 is a cross-sectional view taken along the line AA of FIG. 1 showing one of the blades 4 provided on the ridge line of the splitter of the present invention, and a flat portion 5 having a length m is formed at the apex portion. An example is shown. The left end of FIG. 4 shows an example in which the blade is cut on the extension line of the plane portion 3. The right end of the figure shows an example in which the blade is cut at an angle α in the axial direction of the splitter.

  FIG. 5A is a plan view of one blade of the splitter of the present invention, and FIG. B is a plan view of the conventional splitter when the twist angle ψ is zero for reference. In the present invention, the triangle (shaded portion in the figure) formed by the intersections m1 and n1 of the vertex P1 of the blade 4 and the plane portion 3 is on the extended line of the plane portion 3. In the splitting process, in FIG. 5A, the film first contacts with the line F connecting the P1 and m1 with respect to the direction F into which the wide stretched film enters. Therefore, the split tension is reduced, the film is cut and the splitting property is good. good. On the other hand, FIG. 5B, which is a conventional method, cannot be said to have good splitting properties because the film is received by the area of the triangle formed by Q1, x1, and y1 and not by the line.

  FIG. 6 is a plan view showing another example when the splitter is set in a direction in which the P2 portion of FIG. In the case of this figure, since the film first hits the point of the apex P2, the film is cut better than FIG. 5A and the split property is good.

  FIG. 7 is a sectional view showing the process of splitting a wide film by the splitter of the present invention. The wide stretched film 11 is nipped by introduction nip rolls 12 a and 12 b and guided to the splitter 1. The wide stretched film 11 travels at a contact angle θ with the splitter, and the splitter 1 rotates at a surface speed that is 2 to 5 times the traveling speed of the film. The wide stretched film 1 is given a split tension by the speed difference between the introduction nip rolls 12a and 12b and the take-up nip rolls 13a and 13b, and the wide stretched film becomes the wide split web 14 by the split tension.

  FIG. 8 is a conceptual diagram showing a state in which the wide split web 21 in which the wide stretched film is split by the splitter of the present invention is widened in the lateral direction. The wide split web 21 includes a trunk portion 22 and a branch portion 23. The small crack to be a problem in the present invention becomes a small crack portion 24 when the branch portion 23 is connected and cut by the flack of the wide stretched film on the splitter and widened. The present invention is characterized in that the occurrence of the small crack portion 24 can be reduced.

9, the blade 32a and to the right of the thread-like blade 32b in the opposite direction from the thread provided on splitter 31 is threaded shaped blade from the central portion of the splitter 21 in the left direction thread-like of the present invention It is a conceptual diagram which shows the example which is a blade. In this figure shows big for clarity the angle α and -α thread shaped blade, but actually a very small angle, as described above. In the direction of the blade was cut to the thread-like, it is determined the direction of inclination of the stem 22 shown in FIG. By being threaded symmetrically in this way, the wide split web can be a web having a different trunk inclination from the center of the web to the left and right.

FIG. 10 is a front view of the splitter showing that the helical twist of the ridge line portion provided in the splitter of the present invention is twisted in the opposite direction from the center to the left and right. The splitter 41 has ridge portions 42a and 42b having spiral angles opposite to each other at the center thereof. Each ridge portion 42a, the thread-like blades provided on 42b orientation, may be the same direction, it can be opposite to each other as shown in FIG.

  FIG. 11 is a cross-sectional view of an example in which protrusions 53a, 53b, 53c,... Are formed between adjacent ridge lines 52a, 52b, 52c,. Shown in the figure. Due to the presence of such a protrusion 32, even if the spiral angle formed by the ridge line portion 42 is large, the traveling film is not wavy and, therefore, a splitter with few small cracks can be obtained.

  The splitter of the present invention is used for splitting a wide stretched film, and is used for production of a nonwoven fabric and the like of a wide split web.

1: splitter, 2: ridge line part, 3: flat part, 4: blade, 5a, 5b: mounting terminal.
11: Wide stretched film, 12a, 12b: Introduction nip roll,
13a, 13b: take-up nip roll, 14: wide split web.
21: Wide split web 22: Trunk part 23: Branch part 24: Small crack part
31: splitter, 32a, 32 b: reverse thread-like blade to each other.
41: splitter, 42a, 42b: ridge lines having spiral angles opposite to each other.
51: Splitter, 52a, 52b, 52c: Ridge line part,
53a, 53b, 53c: protrusions

Claims (8)

A rotating body having a polygonal polygonal cross section,
A number of blades are formed in a thread shape on the ridge portion of the polygon,
The cross-section is formed by twisting the ridge line portion of the polygonal rod-shaped body into a spiral shape,
A silencing splitter for a wide stretched film characterized by the above. The silencer splitter for wide stretched films according to claim 1, wherein the spiral angle is 2 degrees or more and 60 degrees or less. The silencing splitter for wide stretched films of Claim 1 whose polygon of the said cross section is 5-10 square. The silencing splitter for wide stretched films according to claim 1, wherein the apex portion of the portion forming the blade of the ridge line portion has a parallel portion of 2-12 mm. The silencing splitter for wide stretched films according to claim 1, wherein at least one end portion of the portion forming the blade of the ridge line portion has a cut portion in a direction perpendicular to the polygonal surface. Threads formed in the shape blade of the ridge portion is left to the right and left from the center portion of the splitter, and is formed to the right and different directions Hirohaba stretched film for silencing splitter of claim 1. The silencer splitter for a wide stretched film according to claim 1, wherein the helical twist provided at the ridge portion of the rod-like body is formed in a direction different from leftward and rightward from the center of the splitter. The silencing splitter for wide stretched films according to claim 1, wherein a protrusion is formed between adjacent ridgelines of the polygonal column.

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