JP2008143659A - Easily tearable wound adhesive tape - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an easily tearable wound adhesive tape facilitating the opening of the articles of small commodities such as farm products and confectionery put in a bag, the opening of which is closed with a narrow adhesive tape; and a machining device and method thereof. <P>SOLUTION: On a rotation stand rotated by a motor, a wound adhesive tape is temporary fixed to a position where the rotation center on a rotation stand and a center of a paper pipe of the wound adhesive tape match. On the other hand, at least one arm equipped with an easily tearable machining tool is extended from a center shaft capable of vertically moving at a position matching with the rotation center of the rotation stand in a centrifugal direction The cylindrical easily tearable machining tool is equipped to a position covering a tape layer of the wound tape so as to freely rotate. The easily tearable machining tool closely provided with a large number of semicircular protrusions on an outer peripheral surface presses the tape layer of the wound tape. By rotations of the wound tape, on the whole of a lateral cross section of the wound tape, the easily tearable machining tool provides cracks transferring the protrusions of the easily tearable machining tool on the whole of a base layer of the wound adhesive tape in high density, while self-rotating. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention is an easily tearable wound adhesive tape that makes it easy to open a product in which small items such as vegetables and fruits, such as agricultural products and confectionery, are put in a bag and the bag mouth is ligated with an adhesive tape having a width of about 9 mm. The present invention relates to an easy tear processing device for a tape and an easy tear processing method for a wound adhesive tape.

  A wound adhesive tape having a width of about 9 mm and a length of about 50 m has been widely introduced in the industry, and is widely used for ligating a bag mouth of a packaged product. In order to tie the bag mouth with this wound adhesive tape, the bag mouth is tied at once by holding the bag body and the bag mouth with both hands in a widely ligating device and inserting it into the slit of the device. A wound adhesive tape having a width of 9 mm and a length of 50 m is the most suitable tape for this apparatus. However, when opening a product, the adhesive tape has a strong adhesive force and is shortly ligated, so the customer could not open it manually and had to rely on knifes such as knives and scissors. .

The present inventor disclosed in Patent Document 1 a processing tool for imparting easy opening to an adhesive tape having a bag mouth ligated. That is, the diameter of the center portion is continuously smaller than the diameter of the end portion, and the processing tool shaft is rotatably penetrated through the central portion in the length direction. This is an easy tearing tool for a wound tape in which hard and fine protrusions are densely provided on the circumferential surface and the length of the cylinder is longer than the width of the wound tape to be processed.
This easy tearing tool was processed so that it could be mounted on a conventional commercially available bag mouth ligation apparatus, and a commercially available wound adhesive tape was used to allow easy tearing during use.

  Although this bag mouth ligation processing tool has spread to some extent, there are companies that refuse to attach the bag mouth ligation processing tool, and require an easy-open adhesive tape that has been subjected to easy tearing in advance. The winding thickness of the opening tape that can be used by being mounted on a commercially available bag mouth ligating apparatus is about 5 to 15 mm, and the adhesive tape wound thicker than this has been in a situation that cannot be mounted on a commercially available bag mouth ligating apparatus.

  In the case of a wound pressure-sensitive adhesive tape exceeding 100 m, small rolls are made while slitting the original fabric provided with the pressure-sensitive adhesive layer on the base film. At this time, easy tearing can be performed immediately before the small winding by the method of Patent Document 1. However, when the above method is used for a winding adhesive tape having a length of 100 m or less and a winding thickness of 2 cm or less, the time required for setting becomes longer than the actual winding time, and there is a problem in workability. A wound adhesive tape having a length of 100 m or less and a thickness of 2 cm or less that is currently on the market is provided on the market by winding an adhesive sheet around a long paper tube and then cutting it into a predetermined width.

In Patent Document 2, when sufficient tearability is not obtained by the method of Patent Document 1, a large scar is provided on the central portion side adjacent to the easy tear surface. In this case, the surface of the tape is damaged.
Patent Document 3 discloses a “paper feed roller and its manufacturing method”. And paper adjacent to a recess formed by piercing a tool with a sharp tip at an arbitrary inclination angle in an oblique direction, and formed with a high density of meniscus arc-shaped protrusions that have risen by plastic deformation as a result of the recess formation A feed roller is disclosed.
Japanese Patent No. 2789524 JP 2000-163023 A Japanese Patent No. 3626286 Japanese Examined Patent Publication No. 61-39228

  Unless it is a wound adhesive tape having a length of about 50 to 100 m and a thickness of about 10 to 15 mm, it cannot be attached to a commercially available bag mouth ligation apparatus. Even if it is a wound adhesive tape that has to be cut into pieces after being wound around a paper tube in the manufacturing process, it can be opened manually if it is not easily teared in a state of being cut into pieces. The ligature product was not in widespread use.

  An object of the present invention is to solve the above-described problems, and its configuration is such that a rotating base rotated by a motor has a winding adhesive at a position where the center of rotation of the rotating base coincides with the center of the paper tube of the winding adhesive tape. While temporarily fixing the tape, at least one arm equipped with an easy tear tool is extended in the centrifugal direction from a central axis that is movable up and down and coincides with the rotation center of the turntable, A cylindrical easy tearing tool is rotatably mounted at a position covering the tape layer of the winding tape, and an easy tearing tool in which a large number of half-moon arc-shaped projections are provided in close contact with the outer peripheral surface. When the tape layer is pressed and the winding tape rotates, the easy tearing tool rotates and the cracks that transfer the protrusions of the easy tearing tool on the entire cross section of the winding tape are rotated. It is characterized by being provided at high density throughout the material layer. Further, a winding adhesive tapes obtained by thus.

  That is, the present invention uses the paper feed roller disclosed in Patent Document 3 as a processing tool, and presses the tape surface of the wound adhesive tape that has been cut into a circle to cause a crack in the cross section of the adhesive tape substrate. It is. Patent Document 4 discloses a method of rubbing the cross section of a film with a wire brush. However, the wire brush has insufficient hardness as a processing tool and does not generate cracks. There was a shortage of actual implementation.

The present invention uses the processing tool described in Patent Document 3. This processing tool has as many as 300 to 500 fine protrusions per 1 cm ² , and each protrusion has a half-moon arc shape and causes a sharp crack. The surface of the wound adhesive tape that has been cut into rounds has irregularities of up to about 20 μm, but can be uniformly processed by using a processing tool having protrusions with a height of 100 to 170 μm. Moreover, it is a high-hardness blade that has been hardened after carbon steel has been processed. A feature of the present invention is that cracks occur in the cross section of the tape substrate. Of course, it is not on the plane of the tape end, but is not the boundary between the tape plane and the tape cross section, but the cross section of the tape substrate.

  The wound tape is required to have strength in the length direction. Moreover, the force applied when the tape is torn is torsional stress. The scratch on the flat surface adversely affects the strength of the tape, and the reaction to torsional stress is slow. In order to obtain a sufficient sharpness, the tear strength of the tape is inevitable. On the other hand, since the present invention is only a crack in the transverse direction of the tape base material, it does not adversely affect the strength of the adhesive tape and responds sensitively to torsional stress. Torsional stress is a force that is not applied to the product during distribution, storage and use.

  According to the present invention, it is possible to provide a large number of sharp cracks in the transverse direction of a tape base material in a state of being cut into pieces even when the wound adhesive tape has a length of 100 m or less and a thickness of 2 cm or less. As a result, bag mouth ligation products using adhesive tape can be safely transported and stored and easily broken by hand when necessary.

  The wound adhesive tape according to the present invention has been described using a paper tube having a diameter of 3 inches and a width of 9 mm, and the adhesive tape is wound to a thickness of 10 to 15 mm. However, the diameter, width, adhesive tape length, and adhesive tape are described. The thickness is not limited and can be applied to all wound adhesive tapes that can be processed using the method and apparatus of the present invention. Therefore, the present invention can be applied to a tape having a length of 100 m or more that has been wound using a slitter while being easily teared.

  FIG. 1 is a cross-sectional view of one embodiment of the easy tearing apparatus of the present invention, and FIG. 2 is a cross-sectional view taken along the line II-II in FIG. Reference numeral 1 denotes a turntable, which is rotated about a rotation shaft 2 by a motor and a switch (not shown). The number of rotations is 2 times or more. As the number of rotations is doubled, the number of times of pressing with an easy tearing tool is also doubled. An adhesive tape 3 is wound in close contact with the paper tube 4. Reference numeral 5 denotes a nail-like protrusion for fixing the paper tube at a predetermined position during processing. By pressing the winding tape at the start of processing, the tip of the protrusion is stuck into and fixed to the paper tube, and can be easily released by pulling up the winding tape after the end of processing. Other known methods may be employed as a temporary fixing means during processing of the wound tape.

  Reference numeral 6 denotes a central axis, which can be moved up and down by an air compressor (not shown). Two arms 7 extend from the lower side of the central shaft 6 in the centrifugal direction at intervals of 180 °. A cylindrical easy tearing tool 8 is easily attached to each arm at a position covering the adhesive tape layer 3. That is, the easy tearing tool 8 can freely rotate at a position covering the adhesive tape layer 3 of the arm 7 via a ball bearing or the like. The central shaft 6 is lowered to a position where the easy tearing tool 8 sufficiently presses the adhesive tape 3. Reference numeral 9 denotes an arm pressing means for pressing the arm at the tip portion from the easy tearing tool 8 of the arm 7 so that reliable easy tearing can be performed.

  On the surface of the easy tearing tool, easy tearing protrusions 12 to be described later are provided. A hard square bar is stabbed obliquely into the circumferential surface of a cylinder made of carbon steel. As a result, a concave portion 10 is formed under the square bar, and the metal material in the concave portion is extruded and plastically deformed to be thick and pointed at the tip of a minute meniscus arc-shaped projection 11 having a shape as shown in FIG. Form. The easy tearing projections 12 thus obtained are arranged in a staggered manner as shown in FIG. 4, for example.

Although there is no limitation on the arrangement method, any arrangement may be used as long as sharp scratches can be uniformly formed on the surface of the base material of the wound adhesive tape 3 with which the cutting edge of the semicircular arc-shaped protrusion 11 contacts. Moreover, there is no limitation also on the direction of the half-moon arc-shaped protrusion 11, and it is generally better not to limit it to one kind of angle. In the present embodiment, protrusions directed in opposite directions are provided along the tape length. In the cylindrical easy tearing tool 8, the peak height of the half-moon arc-shaped projection 11 is 140 to 180 μm, and is 50 to 1000 / cm ² , preferably 300 to 600 / cm ² . In this example, about 500 pieces / cm ² of easy tearing protrusions having a peak height of 150 μm and a peak width of 200 μm were provided.
The easy tearing tool 8 of the present invention forms a half-moon arc-shaped protrusion 11 and then hardens it to increase the hardness, and further performs rust prevention processing such as chromium plating and nickel plating.

When the central shaft 6 is lowered and the easy tearing and lowering tool 8 attached to the arm 7 comes into contact with the adhesive tape 3, the turntable 1 starts rotating at the same time or immediately before. The easy tearing lowering tool 8 in contact with the adhesive tape 3 starts to rotate while causing a longitudinal crack in the adhesive tape 3. In this way, when the adhesive tape 3 rotates once, the adhesive tape is pressed twice by the easy tearing tool. If it rotates 3 times, it is pressed 6 times. If the height of the easy tearing tool, the number of peaks per 1 cm ² , and the required number of rotations are determined in this way, any easy tearing can be performed.
Furthermore, although two arms 7 are shown in the drawing, the number of arms may be one, three, four, or more, but an even number is generally preferred.

As shown in the partially enlarged view of FIG. 5, the easily tearable wound adhesive tape obtained by the above method is provided with minute cracks 13 densely provided in the substrate layer 15 in the transverse direction of the tape. Yes. Reference numeral 14 denotes an adhesive layer.
In this example, a pressure-sensitive adhesive sheet 50 m composed of a 45 μm-thick tape base layer and a 20 μm-thick pressure-sensitive adhesive layer is wound around a paper tube having a diameter of 3 inches and processed into a wound pressure-sensitive adhesive tape that is cut into a 9 mm width. gave. Two to three rotations were sufficient. The easily tearable wound pressure-sensitive adhesive tape thus obtained was inferior to the unprocessed tape in tensile strength, and could be opened very sharply when opened.

It is a longitudinal cross-sectional view of one Example of this invention apparatus. It is the II-II sectional view taken on the line of FIG. It is a perspective view of an easy tear process protrusion. It is an example of the layout of an easy tear process protrusion. It is a partially expanded perspective view of the easily tearable wound adhesive tape of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rotation base 2 Rotating shaft 3 Adhesive tape 4 Paper tube 5 Protrusion 6 Center axis 7 Arm 8 Easy tearing tool 9 Arm pressing means 10 Recessed portion 11 Half-moon arc-shaped projection 12 Easy tearing projection 13 Crack 14 Adhesive layer 15 Base material layer

Claims (7)

In a wound adhesive tape wound around a paper tube with the adhesive layer as the inner surface, cracks that are substantially perpendicular to the adhesive tape substrate are present on at least one cross section of the winding roll per 1 cm ² of the cross section of the wound tape. An easily tearable wound adhesive tape characterized by being provided at a rate of 1000 to 5000. The wound adhesive tape is an adhesive tape in which an adhesive sheet obtained by applying an adhesive to a wide film is wound to a thickness of 5 to 15 mm on a paper tube having an outer diameter of 84 to 88 mm, and is cut into a ring having a width of 8 to 10 mm. The easily tearable wound adhesive tape according to claim 1, wherein While the rotating adhesive tape is temporarily fixed to the rotating table rotated by the motor at a position where the rotation center of the rotating table and the center of the paper tube of the wound adhesive tape coincide with each other,
A position in which at least one arm equipped with an easy tearing tool is extended in the centrifugal direction from a central axis that is vertically movable and coincides with the rotation center of the turntable, and covers the tape layer of the wound tape In addition, a cylindrical easy tearing tool is mounted to rotate freely,
Easy splitting processing tool is a Togahari type chisels the circumferential surface of the carbon steel, to form a plurality of crescent arcuate projections obtained by plugging obliquely from the circumferential surface, projecting Kiga 1 cm ² per 300 An easy tearing device for wound adhesive tape, characterized in that 500 or 500 are provided. The easily tearing device for wound adhesive tape according to claim 3, wherein an arm pressing means is provided at the tip of the arm easy tearing tool. While the rotating adhesive tape is temporarily fixed to the rotating table rotated by the motor at a position where the rotation center of the rotating table and the center of the paper tube of the wound adhesive tape coincide with each other,
A position in which at least one arm equipped with an easy tearing tool is extended in the centrifugal direction from a central axis that is vertically movable and coincides with the rotation center of the turntable, and covers the tape layer of the wound tape In addition, a cylindrical easy tearing tool is mounted to rotate freely,
An easy tearing tool with a large number of half-moon arc-shaped projections in close contact with the outer peripheral surface. When the tape layer of the winding tape is pressed and the winding tape rotates, the easy tearing tool rotates while rotating. A method for easily tearing a wound adhesive tape, characterized in that cracks obtained by transferring protrusions of an easily tearable tool to the entire cross section of the tape are provided at a high density on the entire base material layer of the wound adhesive tape. 6. The easy tearing method for wound adhesive tape according to claim 5, wherein the cylindrical easy tearing tool has 300 to 500 half-moon arcuate protrusions per 1 cm ^{2 on} the outer peripheral surface. At least one protrusion with a sharp tip is provided at a position on the turntable that contacts the paper tube of the wound adhesive tape, and the wound adhesive tape is temporarily fixed by the protrusion protruding into the paper tube. The easy tear processing method of the wound adhesive tape according to claim 6.