JPS5947983B2 - Continuous side edge processing equipment for paper cup base paper - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for continuously folding the side edges of base paper for paper cups.

Normally, base paper for containers such as paper cups is laminated with a film such as polyethylene on the side that contacts the liquid surface.
When manufacturing containers such as cups using this base paper,
Cut surfaces at both ends of the body blank (hereinafter referred to as end surfaces)
If the paper is left as it is, and when it is polymerized and bonded to form the body, the end surface on the liquid surface side will not be treated with resin, so the end surface in contact with the liquid will absorb liquid and swell. It begins to seep outside.

Therefore, the side edge of the body that comes into contact with the liquid is smoothed by a certain width, about half of the thickness of the outer surface of the paper.

That is, FIG. 1 shows a paper cup blank a, and A is a plan view thereof, which is shaped like a square, a sector, a rectangle, or a square.

As shown in the cross section of the opening diagram, the surface of about half of the thickness of the paper is scraped off from one of the two end portions S and C (for example, B).

(referred to as skive) d is the raw paper, e is the laminate layer of polyethylene or the like, and f is the skive surface.

g is a groove that facilitates folding of the skive portion.

This groove also prevents cracks that are likely to occur due to bending.

Figure 1 (c) is an explanatory diagram showing a state in which adhesive is applied to the skive surface (f) and the skive surface (f) is folded inward and bonded. Overlap and glue with b facing inwards to form the body of the cup.

FIG. 1 and 2 are explanatory diagrams of the bonded parts, and as can be seen from the figure, all parts that come into contact with the liquid are in contact with a laminate layer of polyethylene or the like, so that no liquid leaks out of the container.

As described above, previously punched cup blanks as shown in FIG.

However, such processing of each leaf is extremely complicated work, and the work itself is not an hour wheel.

The present invention has been developed under these circumstances, namely, the processing steps shown in Figure 1 and C are continuously applied to the side edges of a long sheet of paper as shown in Figure 2. Finally, the blank a is punched out so that the side of the blank comes to the side edge of the paper.

For this purpose, both sides of the paper are first skived as shown in FIG. 1 to form a cross-sectional shape as shown in FIG. 4A.

The steps from the skive to the folding and crimping of the skive portion will be explained below with reference to FIG. 3, which is an explanatory diagram of the processing apparatus of the present invention.

This process may be performed only on one side depending on the paper.

Paper A is wound around a roll B, and a plastic film e made of polyethylene or the like is laminated on the back side of paper d.

Reference numeral C denotes a tension sensing roll, which is linked to the powder brake of the material roll B so that the tension of the paper is always constant.

Next, the sheet enters a skiving device for forming skive portions, and the spiral cutter E rotates at high speed to skive the side edge of the sheet into a cross section as shown in FIG. 1 or FIG. 4.

Spiral cutter E is made of cemented carbide as shown in Figure 5 A, and is skived by high-speed rotation (approximately 1,800 r, 96 m) in an abrasive manner rather than cutting. Front view 1 of the spiral cutter E, the mouth is a side view, the tip of the blade 1 has a protrusion 2, the spiral is directed outward, and all cuttings are discharged to the outside of the long material. It has become.

Since the surface of the skive is frayed, it is sent to dresser F, where it is pressed by a roll using a coil spring that rotates at the same circumferential speed as the feed speed.

This dressing roll 3 is as shown in the external view of FIG. 6A, and has a roll surface in which an annular protrusion 4 matches the skive surface like a mouth.

Next, the skive surface is cleaned and the dust and electricity are removed using a static and dust remover G to avoid reducing the strength of the adhesive.The skive surface of the paper is then removed by an adhesive applicator H consisting of a gray wheel, a glue pot, and a part of a doctor. Apply adhesive near groove g.

FIG. 7 is an explanatory diagram showing the situation, and 5 is a rotating glue wheel.

h is adhesive.

Next, it passes under a heating device J other than an infrared device, and at this time, the solvent, moisture, etc. are evaporated by heating, and the initial adhesive strength is increased.

Furthermore, the skive portion is gradually folded inwardly around the groove g by a folding device K, and is finally folded 9 times over, as shown in the explanatory diagram of FIG.

After this step, the pressure roll L folds the sys-skive portions in half and overlaps them to complete the adhesion.

The original sheet, on which the side edges of the cup paper have been folded in this way, then enters the cutter device M and is cut into blanks for cups as shown in Figure 1A, and the blanks are accumulated to form the remaining paper. The core is rolled up on a roll or cut with a scrap cutter and discharged.

In this way, the conventional process of folding and gluing the side edges of leaf blanks that were previously punched from the original material became more economical and labor-saving for the first time through continuous automation. .

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram showing the method for treating the side edges of cup blanks, where A is the blank, the opening is the cross section of the skive part, C is the skive part folded over, and 2 is the treated side edge of the skive part. Fig. 2 is an explanatory diagram showing how to punch out blanks from original paper, and Fig. 3 shows the side edges of the base paper for paper cups of the present invention. An explanatory diagram of the continuous processing equipment. Figure 4A is an explanatory diagram showing a cross section of the skived raw fabric. The opening is an enlarged cross-sectional view of the skive part. Figure 5A is an illustration of the skive part forming apparatus, the spiral cutter. The front view, the mouth is a side view, Figure 6 A is an explanatory diagram of the dressing for smoothing the skive part, the mouth is an external view of the dressing roll, and Figure 7 is the main part of the adhesive application device and gluing using a glue wheel. Explanatory diagram showing the state of agent application, No. 8
The figure is an explanatory diagram showing the progress of folding of the skive portion. A...Paper, B...Material roll, C.
...Tension sensing device, D...Skiving device (skive forming device), E...Spiral cutter, F...Dresser, G...・
Static neutralization dust removal device, H...Adhesive application -device,
J... Heating device, K... Folding device, L... Pressure roll, M...
Blank cutter, a...Paper cup blank, b, c...End of blank, d...
・Raw material paper, e...layer of polyethylene, etc., f...
...skive surface, g...groove, h...
・Adhesive, 1...Spiral cutter blade, 2
・・・・・・Central protrusion of cutter blade, 3・・・・・・
Dressing roll, 4... Annular projection at the center of the dressing roll.

Claims (1)

[Scope of Claims] 1. On a conveying device that continuously pulls out base paper laminated with a plastic film on the back side from a roll of raw material, there is provided a blade for skiving a surface portion of approximately 1 of the thickness of the paper to a required width at the side edge of the base paper. A skive part forming device using high-speed rotation of an outward facing spiral cutter blade with a slight protrusion in the center, and then a dressing roll having an outer periphery shaped to fit on the skive surface to smooth out fuzz on the skive surface. , Konohira M
. Static neutralization and dust removal equipment for cleaning skive surfaces. Next, an adhesive applicator is applied near the central groove of the skive surface, a heating device using infrared rays or the like for this skive surface, a folding device that folds the skive inward around the central groove, and then the folded portion is completely folded. A side edge continuous processing device for base paper for paper cups, characterized in that pressure rolls for bonding are continuously arranged in sequence.