JPS6247709B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for treating the edges of carton base paper for containers, which allows the joints of paper containers to be made thinner and allows the production of paper containers with good dimensional stability. The purpose is to provide a method that does not generate paper dust.

In recent years, liquid products such as milk and fruit juice drinks have been sold in paper containers because they are easier to handle. In order to prevent leakage, these paper containers, especially paper containers for storing liquid materials, are made by forming a coating layer 2 of vinyl chloride or the like on both sides of a carton base paper 1, as shown in Fig. 1, and forming the container into the desired shape. The joint part is formed by slightly bending the edge 3 on the inside of the container outward and gluing it together.
The other edge 4 of the carton base paper 1 is bonded to the outer surface of the edge 3 bent outward as described above.

However, the above method is inconvenient to handle because the carton base paper has three layers at the joint. For this reason, a known method is to use a grinder or the like to scrape off the paper edge 3, which is conventionally folded, to make it thinner and then adhere it. Since the entanglement of paper fibers is significantly impaired, there is a risk that the strength will deteriorate and the joint will crack, and fine paper dust will be generated during work, which is unfavorable for the work environment. Further, there is a risk that these fine paper dust may remain inside the paper container, and there is also the inconvenience that the paper dust remaining inside the paper container must be completely removed for sanitary control.

The present invention has the structure described in the claims, whereby the bent portion of the edge of the joint can be formed thin without reducing the strength, and a method for processing the end surface of carton base paper without generating paper dust etc. I got it.

2 and 3 show the method of the present invention. Next, the present invention will be explained with reference to the drawings. Of the edges forming the joint of the carton base paper 5, the inner side of the joint is Cut grooves are formed parallel to the end surface 7 on the surface of the end where the carton base paper 5 is located, starting from the one side end surface 7 of the carton base paper 5 at intervals of a width L having a length equal to the sum of the width of the joint and the thickness of the carton base paper 5. form 8. The cut groove 8 has a depth to approximately the midpoint P of the carton base paper 5 (so-called half cut). In order to prevent the carton base paper 5 from getting wet, coating layers 9 made of vinyl chloride or the like are formed on both sides.

Next, at the other end surface 10 of the carton base paper 5 that is orthogonal to the kerf 8, the tip P of the kerf 8 and a line passing through the part P and parallel to the surface 6 of the carton base paper 5 intersect the end surface 7. The corner H of the surface 6 is peeled and cut away from the line segment P--P' formed by the intersection P' along the kerf 8 in parallel with the surface 6. However, it is not necessary to separate the corner H of the front surface 6 from the other end surface 10 of the carton base paper 5;
- It may be separated by cutting along the line segment P' from the end surface 7 side in the direction of the kerf 8.

By cutting off the corner H of the surface 6 as described above, the edge is formed as a tongue piece 11 having a thickness approximately half of the thickness of the carton base paper 5.

In addition, since the cut groove 8 is formed in advance and is cut along the line P-P' parallel to the surface 6, the corner H of the surface 6 always has the same width and thickness. Since the tongue piece 11 is separated as a
can be formed to have the same width and thickness over the entire length.

In addition, since the corner H of the surface 6 of the tongue piece 11 described above is separated, the intertwining of the fibers within the tongue piece 11 is hardly damaged, and there is no risk of deterioration in strength compared to when scraping it off with a grinder or the like. do not have. Further, since no paper dust is generated as would be the case when scraping with a grinder, there is no need for any operation to remove paper dust.

FIG. 4 shows what can be obtained according to another embodiment of the present invention. On the surface 12 of the tongue piece 11 obtained by the method described above, from the part of the cut groove 8, With a width equivalent to the thickness of the carton base paper 5,
A broken line 13 is carved parallel to the cut groove 8. By forming the above-mentioned folding line 13, when the tongue piece 11 is bent, it can be easily bent to the same width, and therefore the length of the tongue piece 11 at the joint part can be made uniform. can.

To form a container using the carton base paper obtained by the method of the present invention, as shown in FIG. The surface 12 of the tongue piece 11 is adhered with the adhesive 14, and the carton base paper 5 is formed into a desired shape so that the surface 6 of the carton base paper 5 forms the outer surface. The tip portion 15 of the other end surface parallel to the end surface 7 is
It may be laminated on the outer surface 16 of the tongue piece 11 which is bent and adhered to the surface 6 of the carton base paper 5 and bonded with an adhesive 17.

In the paper container formed as described above, the joint part can be made thinner, the intertwining of the fibers of the tongue piece 11 is not damaged at all, so there is no risk of cutting from the joint part, and the width of the tongue piece 11 and Since the thickness can be made almost uniform, paper containers with good dimensional stability can be easily mass-produced.

As described above, the present invention allows the end surface of the carton base paper to be simply formed into tongues of the same width and thickness, so that paper containers with good dimensional stability can be manufactured, and there is no generation of paper dust. The process is simple and there is no need to remove paper powder from the paper container.
It also has the effect of improving the working environment.

[Brief explanation of the drawing]

Fig. 1 is an enlarged cross-sectional view of the joint of a paper container according to the conventional method, Fig. 2 is a perspective view of an example of the present invention in which a kerf is formed, and Fig. 3 is a tongue piece formed from the one in Fig. 2. FIG. 4 is a perspective view of a tongue piece according to another embodiment of the present invention, and FIG. 5 is an enlarged sectional view of a container joint made of carton base paper obtained by the method of the present invention. 5... Carton base paper, 6... Carton base paper surface, 7
... End face of carton base paper, 8... Cut groove, 9... Coating layer, 10... Other end face perpendicular to end face 7, 11... Tongue piece, 12... Tongue piece surface, 13... Broken line, 14, 17...
glue.

Claims (1)

[Claims] 1 Among the edges forming the joint of container carton base paper, on the surface of the end located inside the joint,
Parallel to the end surface with a width equal to the sum of the width forming the joint part and the thickness of the carton base paper from the end surface of the end part,
After forming a cut groove having a depth of approximately half the thickness of the carton base paper, the surface portion between the cut groove and the end surface is cut off, and a cut groove having a depth of approximately half the thickness of the base paper is formed at the end of the carton base paper. 1. A method for treating the edge of container carton base paper, the method comprising forming tongues of approximately half the length of the tongue.