JP6729992B2 - How to form a weakening line - Google Patents

Description

The present invention relates to a method of forming a weakening line consisting of circumferentially alternating bridges and slits between a skirt wall of a container cap and a tamper evident band by means of a capping cutter .

Conventionally, in the production of a synthetic resin cap having a tamper-evidence band (hereinafter referred to as TE band), a weakening line forming method in which a weakening line is formed by a cutter between the TE band and the skirt wall by post-processing. As a slit, a slit penetrating in the wall thickness direction of the skirt wall is intermittently formed, leaving a portion that becomes a bridge in the circumferential direction, and then a notch of about half the wall thickness is made on the outer peripheral side of the remaining bridge portion. By reducing the thickness of the bridge, a method has been proposed in which the bridge is easily broken when the cap is opened, and the broken portion of the bridge becomes a thin film and the broken portion is prevented from being sharp (for example, Patent Reference 1).

In the method described in Patent Document 1, a predetermined transport path is moved while revolving and rotating the cap, and a slit and a bridge are circumferentially formed by a stationary outer cutting tool for penetration cutting arranged on the upstream side of the transport path. After being formed alternately, the notch is formed on the outer peripheral side of the bridge by the stationary outer cutting tool for partial cutting arranged on the downstream side of the transport path.

However, in the method described in Patent Document 1, since two types of cutters, a stationary outer cutting tool for penetrating cutting and a stationary outer cutting tool for partial cutting, are arranged side by side, the total distance of the cutting processing region of the cap becomes long. As a result, there is a problem that the cap manufacturing apparatus becomes large in size, and because of the two-stage cutting, cutting is performed with the stationary outer cutting tool for penetration cutting on the upstream side and the stationary outer cutting tool for partial cutting on the downstream side. The position may shift in the vertical axis direction of the cap, and if the cutting position is displaced, a difference in strength will occur between the bridges.

Therefore, as a method for solving the above-described problem, as shown in FIG. 8, a single cutter 110 has a slit blade portion 121 for forming a slit in a cap and a bridge blade portion 131 for making a cut in the bridge. It is also conceivable that the slits and the cuts in the bridge are collectively formed by a single cutter 110 (see, for example, Patent Document 2).

Japanese Patent Publication No. 2-23313 JP-A-56-161953

However, in cutting/cutting into a cap using such a cutter, it is necessary to cut/cut into the cap with one contact with the cutter, so the cutter blade is manufactured with high precision. However, in the cutter 110 described in Patent Document 2, as shown in FIG. 8, two kinds of inclined surfaces (the inclined surface 121a of the slit blade 121, the bridge 121a, Since it is necessary to form both the inclined surfaces 131a) of the blade portion 131, there is a problem that it is difficult to manufacture the blade portions 121 and 131 of the cutter 110 with high accuracy.

Further, in the cutter 110 described in Patent Document 2, since both the inclined surface 121a of the slit blade portion 121 and the inclined surface 131a of the bridge blade portion 131 are formed on one side of the cutter 110, it is shown in FIG. As described above, when the cutter 110 is viewed in a plan view (from the direction perpendicular to the blade), the inclined surface 121a of the slit blade portion 121 and the inclined surface 131a of the bridge blade portion 131 cannot overlap, and the slit blade The width dimension W1 of the inclined surface 121a of the portion 121 and the width dimension W2 of the inclined surface 131a of the bridging blade portion 131 cannot be freely designed, which imposes constraints on the design of the cutter shape.

Therefore, the present invention is to solve these problems, and an object of the present invention is to provide a method of forming a weakened line that can be easily and highly accurately manufactured, and that improves the degree of freedom in design. To do.

The present invention is a method for forming a weakening line composed of bridges and slits alternately arranged along the circumferential direction between a skirt wall of a resin cap and a tamper-evidence band by a cap processing cutter, The cap processing cutter is formed separately from a first cutter portion having a plurality of slit blade portions formed at intervals corresponding to the width of the bridge, and the first cutter portion, and the outer periphery of the bridge. A second cutter portion having a bridge blade portion for making a notch on the side, a first adjusting member arranged on the other edge side opposite to the one edge portion of the first cutter portion, and the second cutter portion And a second adjusting member arranged on the other edge side opposite to the one edge portion, wherein the slit blade portion and the bridge blade portion each have a single-edged shape in which each blade portion has an inclined surface on one side. The first cutter portion and the second cutter portion are arranged such that the inclined surface of the slit blade portion and the inclined surface of the bridge blade portion face opposite to each other. The portion alternately has the slit blade portion and the bridge concave portion along one edge portion thereof, and the bridge blade portion is continuously formed along one edge portion of the second cutter portion. In the first cutter portion and the second cutter portion, the blade edge of the slit blade portion projects further toward the tip side than the blade edge of the bridge blade portion, and the blade edge of the bridge blade portion has the recess portion for bridge. Is arranged so as to project more toward the tip side than the bottom portion, the inclination angle of the inclined surface of the slit blade portion and the inclination angle of the inclined surface of the bridge blade portion are set to the same, and the resin cap On the other hand, the length of the inclined surface of the slit blade portion in the thickness direction in which the cap processing cutter is inserted is the processing of the resin cap on the one surface side where the inclined surface of the slit blade portion is formed. Sometimes, only the inclined surface of the slit blade portion is designed in such a size as to contact the resin cap, and in the wall thickness direction of inserting the cap processing cutter into the resin cap, the bridge blade portion The length of the inclined surface is a dimension such that only the inclined surface of the bridge blade portion comes into contact with the resin cap when the resin cap is processed on the one surface side where the inclined surface of the bridge blade portion is formed. In the processing of the resin cap, only the inclined surface of the slit blade portion is formed on the one side of the slit blade portion where the inclined surface is formed. In the state of contacting the up, the slit blade portion, while penetrating the resin cap in the thickness direction, the bridge blade portion of the bridge blade portion on the one surface side forming the inclined surface of the bridge blade portion. The problem is solved by making a non-penetrating notch in the thickness direction of the bridge blade portion on the outer peripheral side of the bridge in a state where only the inclined surface is in contact with the resin cap.

According to the invention of claim 1 , the slit blade portion and the bridge blade portion are formed in a single-edged shape having an inclined surface on one side, and the first cutter portion and the second cutter portion are inclined of the slit blade portion. The inclined surface of the slit blade portion is formed on one surface side of the cap processing cutter by arranging the inclined surface of the surface and the inclined surface of the bridge blade portion to face each other, and the blade portion for bridge is formed. Since it is sufficient to form the inclined surface on the other surface side of the cap processing cutter, the cap processing cutter can be easily manufactured while ensuring the accuracy of each blade portion.
Further, since the inclined surface of the slit blade portion may be formed on one surface of the cap processing cutter, and the inclined surface of the bridge blade portion may be formed on the other surface of the cap processing cutter, the bridge blade portion The width of the inclined surface and the inclined surface of the slit blade portion can be freely designed, so that the degree of freedom in designing the cutter shape can be improved.
Further, since it is possible to collectively form the slits and cut into the bridge at one time, the cutting position by the slit blade portion, which tends to occur when performing the two-stage cutting as in Patent Document 1, It is possible to prevent a situation in which the cutting position of the bridge blade portion deviates in the vertical axis direction of the cap.

According to the invention of claim 1 , since the first cutter portion and the second cutter portion are separately formed, the first cutter portion and the second cutter portion can be individually manufactured in a single-edged shape. Because it is good, not only can the blade portion for the bridge and the blade portion for the slit be manufactured with high accuracy and easily, but by adjusting the positional relationship between the blade edge of the blade portion for the bridge and the blade edge for the slit blade, It is possible to easily adjust the depth of cut into the bridge by the bridge blade.
Further, since the first cutter portion and the second cutter portion are formed as separate bodies, even when the cutter needs to be replaced due to damage or wear, it is sufficient to replace only the damaged cutter. Therefore, the replacement work can be easily achieved, and the maintenance cost can be reduced.

The top view which shows the cutter for cap processing which is one Embodiment of this invention. The top view which shows a 1st cutter part. The top view which shows a 2nd cutter part. The top view which shows the usage aspect of the cutter for cap processing. Explanatory drawing which shows the insertion state of the blade part in the cap in the VV line position of FIG. Explanatory drawing which shows the insertion state of the blade part in the cap in the VI-VI line position of FIG. Explanatory drawing which shows the cap processed using the cap processing cutter. The perspective view which shows the conventional cutter.

Below, the cap processing cutter 10 which concerns on one Embodiment of this invention is demonstrated based on drawing.

First, as shown in FIG. 4, the cap processing cutter 10 is installed on the inner peripheral side of the cap transport path in the cap manufacturing apparatus (not shown), and is weakened to the cap C that is transported along the transport path while rotating. The line W is formed. Here, the weakening line W of the cap C is formed between the TE band T and the lower end of the tubular skirt wall SK hanging from the peripheral edge of the top wall R of the cap C, as shown in FIG. It is a portion constituted by bridges B and slits SL that are alternately arranged in the circumferential direction of C and connect the lower end of the skirt wall SK and the TE band T.

Hereinafter, a specific configuration of the cap processing cutter 10 will be described with reference to the drawings.

First, as shown in FIGS. 1 to 6, the cap processing cutter 10 includes a first cutter portion 20 and a second cutter portion 30 which are separately formed.

As shown in FIG. 2, FIG. 5, and FIG. 6, the first cutter portion 20 includes a slit blade portion 21 that penetrates the skirt wall SK in the thickness direction and forms the slit SL in the cap C when the cap C is processed. , And bridge recesses 22 having a width corresponding to the bridge B of the cap C are alternately provided along one edge thereof. That is, in the present embodiment, since the first cutter portion 20 is provided with the bridge concave portions 22 at 10 positions, the cap C after cutting has 10 bridges B. As shown in FIG. 5, the slit blade portion 21 is formed in a single-edged shape having an inclined surface 21a only on one surface (upper surface side). Further, as shown in FIG. 2, the first cutter portion 20 has a fixing hole 23 which is formed so as to penetrate therethrough in the thickness direction thereof and which is used for installing the first cutter portion 20 in a fixed state in the cap manufacturing apparatus. doing. In addition, in the case of a resin cap used for a normal bottle cap having a diameter of 28 mm, the bridge recess 22 has 5 to 20 bridges B having a width of about 0.6 to 3.0 mm after cutting. It is preferable to design it. Further, although the bridge recesses 22 of the first cutter unit 20 of the present embodiment have the same width, it is possible to partially provide the bridges B having different breaking strengths by partially changing this width. ..

Further, as shown in FIG. 3, the second cutter portion 30 has a bridge blade portion 31 along its one edge portion for making a cut on the outer peripheral side of the bridge B when processing the cap C. As shown in FIGS. 5 and 6, the bridge blade portion 31 is formed in a single-edged shape having an inclined surface 31a only on one surface (lower surface side). In addition, in this embodiment, as shown in FIG. 3, the bridge blade portion 31 is continuously formed along one edge of the second cutter portion 30, but the first cutter portion 20 and the second cutter portion 30 are formed. The bridge blade portion 31 may be formed only at the position corresponding to the bridge recess 22 of the first cutter portion 20 with the portion 30 installed in the cap manufacturing apparatus. Further, as shown in FIG. 3, the second cutter portion 30 has a fixing hole 32 that is formed so as to penetrate therethrough in the thickness direction thereof and that is used to install the second cutter portion 30 in a fixed state in the cap manufacturing apparatus. doing.

In addition, as shown in FIG. 5, in the first cutter unit 20 and the second cutter unit 30, the blade edge of the slit blade portion 21 is located closer to the tip side than the blade edge of the bridge blade portion 31 when installed in the cap manufacturing apparatus. Without projecting a predetermined amount and without causing a gap between them so that the inclined surface 21a of the slit blade portion 21 and the inclined surface 31a of the bridge blade portion 31 face the opposite sides (that is, the outer sides). Will be placed. That is, the first cutter section 20 and the second cutter section 30 have the flat surface 20a of the first cutter section 20 on the back side of the side on which the inclined surface 21a is formed and the second side of the back side on the side on which the inclined surface 31a is formed. The cutter unit 30 is arranged so as to face the flat surface 30a of the cutter unit 30. In addition, in this embodiment, the inclination angles of the tip of the slit blade portion 21 (inclined surface 21a) of the first cutter portion 20 and the bridge blade portion 31 (inclined surface 31a) of the second cutter portion 30 are the same. .. When the first cutter section 20 and the second cutter section 30 are manufactured by making the inclination angles the same, the same processing can be performed even in the middle of processing, which is an advantage that tool processing is easy.

Further, in this embodiment, when the cap processing cutter 10 is installed in the cap manufacturing apparatus, as shown in FIG. 4, the first adjusting member 40 is arranged on the other edge side of the first cutter portion 20, and The second adjusting member 50 is arranged on the other edge side of the two-cutter unit 30. Accordingly, by adjusting the position and size of the first adjusting member 40, it is possible to adjust the degree of cutting by the slit blade portion 21 into the cap C, and the position and size of the second adjusting member 50. By adjusting, it is possible to adjust the degree of incision to the outer periphery by the bridge blade portion 31, that is, the thickness of the bridge B remaining after the incision processing. In addition, in a normal bottle cap having a diameter of 28 mm, the thickness of the weakened line formation planned portion before cutting is about 0.4 to 2.0 mm. Corresponding to this wall thickness, the bridge blade portion 31 is preferably adjusted so that the thickness of the bridge B is about 0.2 to 0.5 mm after cutting.

In addition, in the above-described embodiment, the cap processing cutter has been described as including the first cutter portion and the second cutter portion that are formed separately from each other, but the first cutter portion and the second cutter portion are integrated. You may comprise.
Further, in the above-described embodiment, the cap processing cutter is fixed during processing of the cap, and the cap is moved along the blade of the cap processing cutter to form the weakening line on the cap. Conversely, the cap may be fixed and the cap processing cutter may be moved along the outer periphery of the cap.
Further, in the above-described embodiment, each blade portion is formed on the outer peripheral side of each curved cutter portion, but each blade portion may be formed on the inner peripheral side of each cutter portion, and the edge of the blade portion side is also formed. The part may be formed in a linear shape.
Further, specific aspects such as a cutting edge angle and a width dimension of each blade portion (slit blade portion, bridge blade portion) may be appropriately determined according to a specific aspect such as a material of a cutter or a cap.
Further, in the above-mentioned embodiment, the cap is made of synthetic resin, but the cap may be made of any material.

10 ・・・Cutter for cap processing 20 ・・・First cutter part 20a ・・・Flat surface 21 ・・・Slit blade part 21a ・・・Inclined surface 22 ・・・Bridge recess 23 ・・・Fixing hole 30 ... 2nd cutter part 30a ... Flat surface 31 ... Bridge blade part 31a ... Inclined surface 32 ... Fixing hole 40 ... 1st adjustment member 50 ... 2nd adjustment Member C ・・・ Cap W ・・・ Weakening line B ・・・ Bridge SL ・・・ Slit R ・・・ Top wall SK ・・・ Skirt wall T ・・・ TE band

Claims (1)

A method for forming a weakening line composed of bridges and slits alternately arranged along the circumferential direction between a skirt wall of a resin cap and a tamper-evidence band by a cap processing cutter,
The cap processing cutter is formed separately from a first cutter portion having a plurality of slit blade portions formed at intervals corresponding to the width of the bridge, and the first cutter portion, and the outer periphery of the bridge. A second cutter portion having a bridge blade portion for making a notch on the side, a first adjusting member arranged on the other edge side opposite to the one edge portion of the first cutter portion, and the second cutter portion A second adjusting member arranged on the other edge side opposite to the one edge portion of
The slit blade portion and the bridge blade portion, each blade portion is formed in a single-edged shape having an inclined surface on one side,
The first cutter portion and the second cutter portion are arranged so that the inclined surface of the slit blade portion and the inclined surface of the bridge blade portion face opposite to each other,
The first cutter portion alternately has the slit blade portion and the bridge concave portion along one edge thereof,
The bridge blade portion is continuously formed along one edge of the second cutter portion,
In the first cutter portion and the second cutter portion, the blade edge of the slit blade portion projects farther toward the tip side than the blade edge of the bridge blade portion, and the blade edge of the bridge blade portion is the bridge recessed portion. It is arranged so as to project to the tip side from the bottom,
The inclination angle of the inclined surface of the slit blade portion and the inclination angle of the inclined surface of the bridge blade portion are set to the same,
In the thickness direction of inserting the cap processing cutter with respect to the resin cap, the length of the inclined surface of the slit blade portion is the one surface side on which the inclined surface of the slit blade portion is formed, Designed in such a size that only the inclined surface of the slit blade portion contacts the resin cap when processing the resin cap,
In the thickness direction of inserting the cutter for cap processing with respect to the resin cap, the length of the inclined surface of the blade portion for bridge is the one surface side on which the inclined surface of the blade portion for bridge is formed, Designed with dimensions such that only the inclined surface of the bridge blade portion contacts the resin cap during processing of the resin cap,
During processing of the resin cap, only the inclined surface of the slit blade portion is in contact with the resin cap on the one side where the inclined surface of the slit blade portion is formed, and the slit blade portion is, While piercing the resin cap in the thickness direction, in the state where only the inclined surface of the bridge blade portion is in contact with the resin cap on the one surface side forming the inclined surface of the bridge blade portion, the bridge A method for forming a weakening line, characterized in that the blade part makes a non-penetrating cut in the thickness direction on the outer peripheral side of the bridge.

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