JPH08309889A - Female die for corrugated fiberboard - Google Patents

Abstract

PURPOSE: To accurately obtain a rule parallel to a step by cutting cross grooves at an interval in the direction perpendicular to the groove formed by a stripe on a plastic sheet or a hard sheet. CONSTITUTION: A surface plate 3 is stuck corresponding to a punching die installed in a flat board punching machine and a rule cutter of the punching die on a cutting plate. The plate 3 is formed by a groove formed by the two stripes of a plastic sheet or hard sheet, a polyester film at the bottom and a double-sided adhesive on its rear surface. Cross grooves 35 are formed perpendicularly to the groove 34 of a female die 3. When the die 3 is set and punched, a desired corrugated fiberboard is formed. In this case, a core 23 is not uniformly compressed at the right and left sides of a rule 22. Small protrusions 351 are formed perpendicularly to the surface plate mark 21. The protrusion 351 aids to completely fold at the center between the rule 22 and the mark 21.

Description

Detailed Description of the Invention

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the manufacture of corrugated cardboard boxes, and more particularly to a ruled line used in a flat board punching machine, and more particularly to a female die for forming ruled lines parallel to a step.

[Prior Art] Conventionally, a cardboard box has not been required to be more accurate than a paper container. However, recently, with the advent of automatic box making machines, high precision is required. Particularly accurate spacing between ruled lines is important for obtaining box dimensional accuracy. Recently, in order to obtain highly accurate ruled lines, a face plate (female type) has been attached to a cutting plate like a paper container. As the product, a product name such as CITO tape is generally used. As a publicly known technique, as a tape-shaped one, the actual development of 59-35025 and the actual development of 61-67.
119, British Patent 807251, USP 2524962,
USP 3884132, USP 3919924, and plate-shaped ones, Shokai 61-111722, US
P3847036, USP4256026 and the like.
However, these known techniques are effective in printing paper containers, but not in cardboard. As shown in the example of the developed view of the corrugated board box in FIG. 8, a ruled line 25 (SCOR
E) can be formed with high accuracy without any problem, but it is difficult to form the ruled line 22 (CREASE) formed in the direction parallel to the step 23 with high accuracy. The reason is step 23 as shown in Fig. 1.
Although the pitches are equal, the desired dimensions are uncertain where the peaks or valleys of the step 23 fall. As shown in Fig. 2, the center core 23 is evenly left and right if it hits a mountain, so it can be bent accurately at the center of the face plate mark 21, but as shown in Fig. 3 Even if the face plate 3 is set, it cannot be bent at the center of the face plate trace 21 and it is not known where it will be broken, so the dimensions are incorrect. After the stamping process, the blanks are glued in a gluer or packer. In the case of the box shown in FIG. 8, when the glue margin 26 is glued with glue, the second and fourth ruled lines counting from the glue margin are guided by the guide bar, but there are many defects due to inaccurate folding.

[Problems to be Solved by the Invention] The present invention uses a special face plate 3 as shown in FIG.
The ruled line 22 parallel to is also obtained by obtaining a highly accurate ruled line.

[Means for Solving the Problem] As shown in FIG. 4, a large number of cross grooves 3 are formed in a direction perpendicular to the grooves 34 of the conventional face plate 3.
Cut 5 at intervals.

[Operation] The face plate 3 of the present invention is set in the flat plate punching machine and punched. As a result, as shown in FIG. 5, small projections 351 are formed on the corrugated liner 24 at right angles to the ruled line traces 21. The inventor cannot completely elucidate why the small projection 351 causes an action of folding the ruled line 21 accurately from the center, but as a result of the experiment, the ruled line 22 parallel to the step 23 is completely formed at the center of the face plate trace 21. It turned out to break exactly.

[Embodiment] The present invention will be described in more detail with reference to the accompanying drawings. FIG. 1 is a cross-sectional view showing a conventional face plate 3 (female type) and its usage. The face plate 3 is pasted on the die 1 and the cutting plate 4 installed in the flat board punching machine so as to correspond to the ruled line blades 11 of the die 1.
The face plate 3 is composed of a groove 34 formed of two plastic sheet or hard paper stripes 31, a polyester film 32 on the bottom, and a double-sided adhesive 33 on the back surface thereof. In FIG. 4, it is only necessary to form the cross groove 35 in a direction perpendicular to the groove 34 of the conventional female die 3. When this female die 3 is set and punched, a cardboard as shown in FIG. 5 is formed.
FIG. 5 is a perspective view seen from the back surface. Core 23 is ruled line 22
The left and right sides of are not compressed uniformly. A small protrusion 351 is formed on the face plate trace 21 in a direction perpendicular to the surface. This small protrusion 351
Helps to fold completely at the center of the crease 22 and face plate trace 21. The reason why the small projection 351 breaks the ruled line 22 at the center of the face plate trace 21 is not clear. But I think as follows. The small protrusion 351 partially breaks the core 23 adjacent to the face plate trace 21 to help the ruled line 22 to be broken at the center of the face plate trace 21. In the case of the E-flute, the width of the cross groove 35 and the cutting interval were optimally 2 mm wide and 15 mm. However, the type of step, the width of the groove, and the interval are not limited to these numerical values. Cross groove 3
5 is cut by milling. If a large amount is needed, hard paper can be punched out and glued to make the tape of Figure 4.
Although the present invention has been described in the form of a tape, USP 42560
It is also possible to form a sheet like 26. The above description is for a punching machine by vertical movement like the flat board punching machine of FIG. 1, but the invention is not limited to this. A rotary die cutter is also possible. FIG. 6 shows another embodiment. It is a sectional view of a creasing roller 5 of a printer slotter or a flexo slotter. This roller is used to form the creases 22 of the cardboard box of FIG. The ruled line 25 is formed by a corrugator. This creasing roller 5 includes a shaft 51, a male ruler roller 52, a male ruler blade 54,
The knife ruler roller 53 has a knife groove 55. As shown in FIG. 7, cross grooves 56 are cut on the outer periphery of the knife ruled roller 53 in the direction perpendicular to the knife grooves 55 at intervals. The cross groove 56 forms the small protrusion 351. Cross groove 54
Is cut by the female ruler roller 53, but instead of this, it is also possible to install cross protrusions in which the shape of the cross groove 54 is raised in the direction perpendicular to the male ruler blade 54 of the male ruler roller 52 at intervals. is there.

[Advantages of the Invention] Since the present invention has the above-described configuration, (A) When the ruled line 22 parallel to the corrugated corrugated step 23 is folded, the small projection 351 is accurately formed from the center of the face plate trace 21. Break (B) Only a slight modification of the conventional face plate is required. No special equipment required.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of conventional corrugated board punching.

FIG. 2 is a cross-sectional view punched in parallel with a conventional corrugated board step.

FIG. 3 is a cross-sectional view punched in parallel with a conventional corrugated board step.

FIG. 4 is a perspective view of an embodiment of the present invention.

5 is a perspective view of a corrugated cardboard punched using the face plate of FIG.

FIG. 6 is a cross-sectional view of a conventional flexo-slotter roller.

FIG. 7 is a side view of a female roller according to another embodiment of the present invention.

FIG. 8 is a developed plan view of “A-1 type”. Some of the ryers are cut out.

[Explanation of symbols]

1; Die-cut, 11; Ruled blade, 2; Corrugated board, 21; Face plate trace, 22; Ruled line (CREAS), 23; Step, 24; Liner, 25; Ruled line (SCORE), 26; Glue margin, 3; Face plate, 31 Stripe, 32; Polyester film, 33; Double-sided adhesive, 34; Groove, 35; Cross groove, 3
51; small protrusion, 5; slitter roller, 51; shaft, 52; male ruled roller, 53; female ruled roller,
54; male ruled line blade, 55; female groove, 56; cross groove,

Claims (3)

[Claims] 1. A face plate (3) characterized in that cross grooves (35) are cut at intervals in a direction perpendicular to a groove (34) constituted by two plastic sheet or hard paper stripes (31). 2. A knife ruler roller 5 characterized by cutting cross grooves 56 in a direction perpendicular to the knife grooves 55 at intervals.
3. 3. A male ruler roller 52, characterized in that cross protrusions are installed at right angles to the male ruler blade 54 at intervals.