JPS5810043B2 - Method for manufacturing paper tube assembly - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a paper tube assembly having a cut extending through the side wall of a forest-like paper tube and having a depth within a bending range.

The paper tube seedling cultivation technique has been widely used in the past, in which plant seedlings are grown in paper tube pots, and after a certain period of time, the plant seedlings are transplanted to the field in their pots, which promotes mechanization of the transplanting process and saves labor. It has greatly contributed to the

Such a paper tube pot body is required to not rot during the seedling-raising period and to allow the roots of the plant seedlings to easily root and grow through the side wall of the pot body after being transplanted to the field.

In order to satisfy these quality requirements, the corrosivity of the paper can be controlled by chemical treatment that imparts corrosion resistance to the paper before or after the base paper making process, or thick and thin parts are created in the paper during the paper making process (especially (Japanese Publication No. 44-5402), a large number of small holes are formed in a polka dot pattern on a paper, and cylinders are made from this paper, and when assembled, adjacent paper cylinders are made so that the small holes do not communicate with each other. Various types of pot bodies have been devised, such as a paper tube pot body with discontinuous perforations at the folds (Japanese Patent Application Laid-open No. 7403/1983). has been done.

However, when using chemically treated base paper, advanced techniques are required to adjust the concentration of chemicals, and when using paper with thick and thin sections, special techniques are required for papermaking. It is difficult to obtain paper with uniform thin sections.

Also, Publication No. 51-12362 and JP-A-53-7403
In the case of No. 3, glue enters through the small holes or perforations in the process of assembling paper tubes by gluing, making it impossible for the paper tube aggregate to develop normally. It is difficult to completely prevent entanglement, which causes many problems.

In addition, during the seedling raising period, the corrosion is in the process of progressing, but it does not allow the roots to penetrate, but after transplanting, the corrosion is complete and the paper thickness is selected to make it easier for the roots to penetrate. The degree of corrosion of the paper can be adjusted, but this requires supplying paper of the required thickness each time, and there are many problems such as draughts due to weakening of the paper strength of the entire paper tube pot body when seedlings are collected. It's completely impractical.

In view of the above circumstances, the present invention was developed through intensive research aimed at obtaining a paper cylinder that is easy to manufacture and has sufficient quality required as a paper cylinder for raising seedlings.The present invention was developed by making a cut in the base paper for cylinder making with a depth range that does not penetrate the paper. By processing and forming paper cylinders from this paper, it is easy to manufacture, and the degree of corrosion at the cut part can be arbitrarily selected depending on the depth of the cut, and during the seedling-raising period, there is no root entanglement between adjacent paper cylinders. After transplanting, it was possible to create a paper tube that allows roots to quickly grow from the side wall.

This will be explained below.

The base paper for tube making used in this invention may be any paper material such as kraft paper made of natural fibers, synthetic fiber mixed paper made by mixing natural fibers with synthetic fibers, or kraft paper or synthetic fiber mixed paper treated with chemicals. Can be used.

The manufacturing process will be described with reference to the drawings. A paper 2 is pulled out in the direction of the arrow from a roll 1 which has been wound up with a paper material appropriately selected from the above-mentioned paper material group, and fed into a scoring device 5 comprising a roll 3 and a knife roll 4.

In the scoring device 5, the depth of the edge σ' of the knife 6 into the paper 2 can be adjusted in accordance with the thickness of the paper 2 running on the roll 3.

Therefore, the paper 2 fed into the scoring device 5 becomes a scored paper 2a with cuts 8 of a predetermined depth that do not penetrate the paper 2 on one side thereof.

It is also possible to make the cuts perpendicular to the paper flow direction, and the cutting machine in this case is as shown in Figure 3.
The knife 6 may be set perpendicular to the paper drawer in the direction of the arrow.

The depth of the cut 8 made in the paper 2 is determined by the shape of the paper tube to be made and the conditions for raising seedlings, and the depth of the cut 8 and the residual tensile strength of the cut after burying in the soil are determined in advance for the given paper material. It is easy to make adjustments by determining the relationship between (indicating the degree of corrosion).

An example of this relationship will now be explained using vinylon mixed kraft paper.

Basis weight 601 made by mixing 20% vinylon fiber with kraft paper.
/r' Paper thickness 80μ vinylon mixed kraft paper 60X1
Cut to 20m/m and place approximately 0.1m/m in the center of the paper.
A cut was made in each test method, and the paper was buried in soil with a controlled humidity of 35% for two weeks, and then taken out and the left and right ears of the paper strip were set in a zipper-type expansion force tester so as to expand the cut. The wet tensile strength (kg) was measured.

The results are shown in Table 1.

From the data in Table 1, the increase in the number of kites remaining in the cut area and the tensile strength after burial
), y=
o, 0238
It has been shown that the relationship between is sufficiently explained by the above equation.

Note that even when the paper quality and the embedding treatment period are changed, the relationship between the cut remaining pattern and the post-embedding tensile strength y) is explained by a linear equation.

Therefore, by calculating in advance a regression equation that expresses the remaining thickness of the paper used and the tensile strength after burying, it is possible to extremely easily provide the necessary embedding strength corresponding to the seedling raising conditions by adjusting the remaining thickness of the cut part. This eliminates the need for complicated, labor-intensive, and technical measures such as obtaining paper materials whose specifications are changed each time in response to changes in seedling-raising conditions, or delicately adjusting the chemical treatment of the paper, as in the past.

The scored paper 2a then enters a slitter 9, where it becomes a narrow strip of tape 2b, and as it passes through a gluing roll 10, each narrow strip of tape 2b is glued on one side edge and passed through a cylinder forming device 11. It is molded and laminated into a cylindrical body 2c, and passed through a pressing roll 12 to become a pressed cylindrical body 2d.

Next, a plurality of compressed cylindrical bodies 2d are brought together so that 1/2 or 1/3 of their widths overlap alternately to form a band-shaped body 2e or 2f with glue. After applying glue to one side of the body, cut it to a predetermined length to make a cut piece.If the band-shaped body is 2e, make it face-to-face for each layer, and if the band-shaped body is 2f, make it a cut piece. , and then stack them one after another and press them together.

When unfolded, it presents a square or hexagonal prism pot assembly (Figs. 7 and 8), and each pot has its own length marked on the inner wall of the pot as shown in Fig. 9. In addition, if the scoring device 5 is structured to provide cuts 8 on both sides of the paper 2, the cuts 8 will be provided on the inner and outer walls of the pot body as shown in FIG. 10. .

Further, in the case of the scoring device shown in FIG. 3, horizontal cuts 8 are similarly provided on the inner wall or the inner and outer walls of the pot body.

(Figures 11 and 12) Even if the paper tube aggregates obtained in this manner are filled with soil, sown, and the seedlings are raised for a specified period of time, the cuts are still cruel, and during the seedling-raising period, the roots of the seedlings are still damaged due to corrosion. Since the cut is made to a degree that does not allow passage, roots will not grow from the cut 8, and root entanglement between adjacent pot bodies will not occur.

After raising the seedlings and separating them into individual pots and transplanting them to the field, the remaining parts of the cut will become corroded and the roots of the seedlings will easily take root and grow through these parts, so the seedlings will have sufficient rooting and will not suffer from poor growth. It doesn't happen.

Note that the cut line may be continuous or discontinuous.

Furthermore, as another means of making cuts deep enough not to penetrate the paper, it is possible to stack sheets of tape-like paper of a certain width in parallel in the horizontal direction without overlapping with other sheet-like materials in the same parallel manner. At this time, there is a method of gluing the upper and lower knots so that they are offset from each other, or a method of pasting tape-like paper to a piece of wide paper. It is possible to expect almost the same effect as using paper with cut edges.

As described above, when manufacturing a paper tube according to the present invention, the degree of corrosion of the pot body can be arbitrarily adjusted by adjusting the depth of the cut, the selection of paper is easy, and no special papermaking process is required, resulting in low cost. Because it does not penetrate the paper, there is no problem with glue infiltration during manufacturing, and there are no problems with development.

Also, when using this paper tube, the roots of the seedlings will not be entwined with each other (
Separation into individual seedlings is easy, and after transplanting, roots are allowed to quickly grow from the cut portion of the paper tube, resulting in good rooting.

The paper tube assembly produced according to the present invention can be used in exactly the same way as conventional paper tube aggregates, and its effects are even greater.

Next, examples will be shown.

Basis weight 57.4 made by mixing 16% vinylon fiber with natural fibers.
g/m: The remaining thickness of the cut on one side of the 70μ thick base paper is 20μ
Using the cutting device shown in Fig. 2, which is set so that the diameter of
Paper tubes in the form of hexagonal prisms with a height of 130 mm were prepared, and the paper tubes were glued together in 20 rows and 70 stages to produce a paper tube assembly with 1400 pot bodies.

When beet seeds were sown using this paper tube assembly and the seedlings were raised for 30 days, there were no problems such as entangled roots or damage to the paper tube that would hinder the transplanting process, and the seeds could be easily separated after transplanting. We investigated the rooting status and growth rate of the seedlings per week, and found that the cut-treated seedlings exhibited significantly greater rooting from the cut-treated areas than paper tube seedlings grown under the same conditions using uncut paper tube aggregates. The growth amount increased by about 20%.

[Brief explanation of drawings]

Figure 1 is a flow sheet showing an example of the manufacturing process of a paper tube assembly, Figure 2 is an explanatory diagram of the situation in which cuts are made parallel to the paper travel direction, and Figure 3 is a diagram showing cuts transversely to the paper travel direction. An explanatory diagram of the application situation, Fig. 4 shows the compressed cylindrical body with cuts, Fig. 5
The figure shows a band-shaped body formed by alternately overlapping the cylindrical bodies of 1/2 width in Figure 4, Figure 6 shows a band-shaped body formed by alternately overlapping the cylindrical bodies of 1/3 width in Figure 4, and 7. The figure shows the unfolded state of the rectangular prism pot constructed by laminating and laminating the strips shown in FIG. 5, and the unfolding state of the hexagonal prism pot constructed by laminating and laminating the strips shown in FIG. FIGS. 9 to 12 are views showing a pot body in which cuts are made in the length direction or the lateral direction of the pot body, respectively, on the inner wall or the inner and outer walls of the pot body. 1...Base paper roll, 2...Paper, 2a.
...cutting [processed paper, 5... cut processing device,
8... Cut.

Claims (1)

[Scope of Claims] 1. In a method for manufacturing a paper tube assembly by gluing together a large number of open and bottomless forest-like paper tubes, a cut having a depth range that does not penetrate the base paper on one or both sides of the paper tube base paper is provided. A method for producing a paper tube assembly with cuts, characterized by forming a forest-like paper tube from the scored base paper, and then aggregating a large number of the forest-like paper tubes by gluing. . 2. A method for manufacturing a paper tube assembly according to claim 1, which comprises adding cuts to a sheet of base paper using a slitter or the like. 3. A method for producing a paper tube assembly according to claim 1, item 1, characterized in that the cuts are made by combining paper cut into tape shapes. 4. A method for producing a thread aggregate according to claim 1, characterized in that the cuts are made by combining a tape-like paper and a sheet-like paper.