JP2005313381A - Scoring roll - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a scoring roll capable of forming a fold becoming a folding line to a paper tube for a bag in a uniform width in parallel to the leading end edge of the paper tube for the bag. <P>SOLUTION: The scoring roll is composed of a female roll 2 and a male roll 3 both of which are mutually opposed so as to hold the axial leading end sides of the front and rear pieces of the paper tube for the bag and a groove 4 is formed to the outer peripheral surface of the female roll 2 along the peripheral direction thereof while the ridge 5 fitted in the groove 4 is formed to the outer peripheral surface of the male roll 3 and the peripheral direction thereof. The cross section of the ridge 5 is formed so that the surface (one side) 6 near to the leading end edge of the paper tube for the bag is inclined and the other side 7 thereof is formed into an almost triangular shape almost right-angled to the center axis of the male roll 3. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a scoring roll that forms streaks that form fold lines parallel to both end edges in the axial direction of the bag paper tube in the bag paper tube before the bottom bonding in the bag bottom closing step.

Japanese Industrial Standards (JIS) Z1531 Kraft Paper Bags-General Table 1 B-1 (double-bottomed bag without pleats) or A-1 (single-bottomed bag without pleats) standard Paper bags, especially the so-called “PV bags” used for storing powders such as mixed powder, starch powder, corn starch, yeast, etc. And then paste the upper and lower ends of each layer, and cut to form a bag paper tube of an appropriate length. Then, in an automatic bottom pasting machine called “bottomer”, the bottom of the bag paper tube Close.
To close the bag bottom, open the ends of the front and rear pieces of the bag mouth, fold the left and right ends of the bag mouth in a triangular shape, and then use the scoring roll to each end of the front and rear pieces of the bag mouth. Form a fold line along the width direction, then apply adhesive to the inner surface of the front or rear end, then fold the ends of the front and rear pieces of the bag mouth inward from the fold line, superpose and paste To do.

In general, the scoring roll that forms the fold line is composed of a female roll and a male roll that face each other across the front end or the rear end of the bag paper tube.
Grooves are formed along the circumferential direction on the outer circumferential surface of the female roll, and protrusions that fit into the grooves of the female roll are formed along the circumferential direction on the outer circumferential surface of the male roll.
Then, the ends of the front and rear pieces of the flat bag paper tube are opened from the folding line in the vertical direction, and the bag paper tube is laid with a belt or the like so that the axial direction of the bag paper tube is perpendicular to the transfer direction. Place the scoring rolls on the upper and lower sides of the transfer path so that the female roll is located on the main body side of the bag paper tube and the male roll is on the bottom side of the bag paper tube. By passing between the female roll and the male roll, a mesh line forming a fold line is formed by the engaged grooves and protrusions.

By the way, as shown in the figure, in the conventional scoring roll, the groove b of the female roll a has a triangular cross section with an opening angle of about 90 degrees that is symmetric about the bottom thereof, and the male roll c has The ridge d has a triangular cross section that is symmetrical about the top and has a top angle of about 60 degrees.
When the front and rear end portions of the bag paper tube are fed between the female roll a and the male roll c, the paper is bent and a raised line is formed, so the end portions of the front and rear pieces of the bag paper tube are folded lines. Try to shrink to the side (the side of the bag paper tube body).

For this reason, the position of the streak is different between the entry side to the scoring roll and the discharge side, and it bends or curves. In addition, depending on the paper quality, the width of the streak is wider on the discharge side than on the approaching side to the scoring roll.
If the streak is distorted, when folding the bag bottom from this streak, not only a complicated device such as a molding inner plate or an outer guide plate is required, but also the gluing range by using the molding inner plate. Is likely to occur, and leakage of contents due to poor adhesion and inability to open due to unnecessary adhesion inside the valve valve are likely to occur.
In addition, the pressure between the male roll and female roll must be adjusted to prevent the streaks from bending or curving, but if the pressure is too strong, the bag may be torn or damaged. Since the basis weight is loose and it is easy to cause molding defects, very skillful techniques are required.

  The problem to be solved by the present invention is that the crease line can be formed in a uniform width parallel to the leading edge of the bag paper tube, thereby improving the finishing accuracy of the bag. It is to provide a scoring roll.

The scoring roll of the present invention forms streaks that form fold lines parallel to the front edge of the front and rear pieces of the bag paper tube, and is formed of the front piece and the rear piece. A female roll and a male roll, the outer peripheral surfaces of which face each other with the axial direction near the front end, are formed, grooves are formed along the circumferential direction on the outer peripheral surface of the female roll, and the female roll is formed on the outer peripheral surface of the male roll. A protrusion that fits into the groove of the roll is formed along the circumferential direction, and the protrusion has an inclined surface near the tip edge of the bag paper tube, and the other surface is substantially perpendicular to the central axis of the male roll. And has a substantially triangular cross section.
You may form the space | interval of the outer peripheral surface of the said female roll, and the outer peripheral surface of a male roll wider than the other side in the front end edge side of the said bag paper tube on both sides of the said groove | channel.

According to the first aspect of the present invention, when the front and rear pieces of the bag paper tube are bent by the grooves of the female roll and the protrusions of the male roll that are meshed with each other, Since the force that pulls the front and rear pieces in the direction of the tip works depending on the shape of the strip, it is possible to prevent the streak from bending, curving, and changing the width, thus forming a uniform width streak at an accurate position As a result, the finishing accuracy of the bag is increased, and when the front and rear pieces are folded from the streak, a molding plate and an outer guide plate disposed along the streak are not necessary.
In addition, since the molding plate is not required, it is possible to apply an adhesive to the streaks that are the bent portions, preventing leakage of the contents, and the valve valve by rubbing the adhesive against the molding plate. Prevent inability to open.
According to the invention which concerns on Claim 2, the front-back piece pulled to the front-end | tip edge direction can be escaped smoothly.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
As shown in FIGS. 1 and 2, the scoring roll 1 of the present invention has a streak 16 that forms a fold line parallel to the front edge of the front piece 11 and rear piece 12 of the bag paper tube 10 near the front end in the axial direction. , 17, 17, 17, 17, 17, and 17, and the female roll 2 and the male roll arranged so that the outer peripheral surfaces are opposed to each other with the axial ends of the front piece 11 and the rear piece 12 facing each other and the central axes are parallel to each other It consists of three.
As shown in FIG. 1, grooves 4 are formed in the outer periphery of the female roll 1 along the circumferential direction, and protrusions 5 that fit into the grooves 4 of the female roll 1 are formed in the circumferential direction on the outer periphery of the male roll 2. Are formed along.

The cross section of the groove 4 of the female roll 1 is formed in a substantially V shape with an opening angle of about 75 degrees.
The cross section of the protrusion 5 of the male roll 2 is substantially triangular, one surface 6 is inclined, the other surface 7 is substantially perpendicular to the central axis of the male roll 2, and the top angle is formed at about 50 degrees. .
In addition, the bottom part of the groove | channel 4 and the top part of the protrusion 5 are rounded off so that paper may not be damaged.
Further, the one surface 6 of the ridge 5 and the side surface 8 of the groove 4 face each other at an angle of about 2 degrees, and the opening 9 is slightly wider than the back portion of the gap 9 between the one surface 6 and the side surface 8.
Furthermore, the space | interval of the outer peripheral surface of the female roll 1 and the outer peripheral surface of the male roll 2 is narrow on the other surface 7 side of the protrusion 5 across the groove 4, and is formed slightly wider on the one surface 6 side.
The dimensions of each part of the female roll 1 and the male roll 2 vary depending on the material of the bag paper tube and the paper thickness. However, in the case of a normal PV bag, the width of the gap 9 is about 0.1 to 0.15 mm and the surface 6 side. The distance between the outer peripheral surface of the female roll 1 and the outer peripheral surface of the male roll 2 is about 0.1 mm.

A fold line is formed by the scoring roll 1 as follows.
As shown in FIG. 2, the flat bag paper tube 10 is laid down, and the axial direction thereof is arranged at right angles to the transfer direction and is fed to the scoring roll 1.
In this pre-process, both ends in the axial direction of the front piece 11 and the rear piece 12 are bent at right angles from the folding lines 13 and 13 ′ along the width direction of the bag paper tube 1 to the outer surface side (up and down direction), and the folding lines 13 and 13 ′, the width direction both ends (the transfer direction both ends) of the front piece 11 and the rear piece 12 are bent inward in the portion on the front end side relative to 13 and 13 ′, and the intersection of the fold line and the both side edges of the tube 10 is the vertex. A triangular side bent piece 14 is formed.
Also, at one bottom opening, a cylindrical valve paper piece 15 is attached to the center of the outer surface of the side bent piece 14 on one side in the width direction so that its axis is along the width direction of the bag paper tube 10.

The scoring roll 1 is provided on the upper and lower sides of the transfer path of the bag paper tube 10 such that each female roll 2 is positioned inside the transfer path and the male roll 3 is positioned outside, and the ridge 5 of each male roll 3. The center axis is arranged in the vertical direction so that the one surface 6 is positioned on the front edge side of the front piece 11 and the rear piece 12, respectively.
Then, both end portions of the front piece 11 and the rear piece 12 of the bag paper tube 10 which are sandwiched and transferred by a belt or the like are fed between the female roll 2 and the male roll 3 facing each other.
While passing between the female roll 2 and the male roll 3, the front piece 11 and the rear piece 12 are bent by the grooves 4 and the ridges 5 that mesh with each other, and protrude inward of the transfer path in parallel with the front edge. Lines 16 and 17 are formed.

By attaching the lines 16 and 17 in this way, the front piece 5 and the rear piece 6 try to shrink in the direction of the folding lines 13 and 13 ′ while passing through the line setting roll 1.
However, as described above, the cross section of the protrusion 5 of the male roll 3 is such that one surface 6 near the front edge of the front piece 11 and the rear piece 12 is inclined, and the other surface 7 is horizontal (parallel to the folding lines 13, 13 '). Therefore, a force that pulls the front piece 11 and the rear piece 12 in the distal direction works, and the interval between the female roll 2 and the male roll 3 is formed slightly wider near the front ends of the front piece 5 and the rear piece 6, Since the pulled front piece 11 and rear piece 12 can be released in the distal direction, the streaks 16, 17 are formed in an accurate position parallel to the front edges of the front piece 11 and the rear piece 12.

The bag paper tube 10 with the streaks 16 and 17 is sent to the next process, the adhesive is applied to the bag bottom, and the front end portion of the front piece 11 and the front end portion of the rear piece 12 become fold lines. It is bent inward from the streaks 16, 17 and polymerized and bonded to each other.
At this time, since the streaks 16 and 17 are formed at accurate positions, it is not necessary to install a molding plate as a ruler along the streaks 16 and 17, and therefore, the adhesive is applied to the portions of the streaks 16 and 17 ( (Folded portion) can be applied.
As a result, it is possible to prevent leakage of the contents filled in the bag and ejection of the contents accompanying deaeration of residual air.
Further, since the molded plate is not used, the adhesive does not adhere to the inside of the valve valve 15 by being rubbed with the molded plate, and the labor for performing the opening inspection of the valve valve 15 one by one can be saved.

The principal part sectional drawing of a scoring roll. FIG. 2A shows a scoring configuration, where FIG. 2A is a front view, and FIG. Sectional drawing of the principal part of the conventional bracing roll.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Straightening roll 2 Female roll 3 Male roll 4 Groove 5 Projection 6 One side 7 Other side 8 Side 9 Gap 10 Bag paper tube 11 Front piece 12 Rear piece 13, 13 'Folding line 14 Side folding piece 15 Valve paper piece 16, 17 Streaks

Claims (2)

  A scoring roll that forms a streak that forms a fold line parallel to the front edge of the front piece and rear piece of the bag paper tube, and sandwiches the front piece and the rear piece closer to the tip, A female roll and a male roll whose outer peripheral surfaces are opposed to each other, a groove is formed in the outer peripheral surface of the female roll along the circumferential direction, and a protrusion that fits into the groove of the female roll is formed on the outer peripheral surface of the male roll. A strip is formed along a circumferential direction, and the strip has a substantially triangular cross section in which a surface near the leading edge of the bag paper tube is inclined and the other surface is substantially perpendicular to the central axis of the male roll. A crease roll characterized by 2. The scoring roll according to claim 1, wherein a gap between the outer peripheral surface of the female roll and the outer peripheral surface of the male roll is formed wider on the leading edge side of the bag paper tube than the other side across the groove.

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