JPS59114045A - Manufacture of paper pipe for packing - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a paper tube container for packaging, which is often used when mailing sheet-like objects such as posters and calendars as long rolls.

Various means have been considered for closing the openings at both ends of the paper tube after the contents have been stored in the paper tube, one of which is to use so-called oil paper.

This is done by wrapping thin paper around both ends of the paper tube so that it extends beyond the opening edge, and after storing the contents, the extended portion of the thin paper is inserted into the paper tube through the opening. This folding is also used as a frontage closing means to prevent the contents from falling out.In this case, the above-mentioned extended thin paper is usually called oil paper.

The present invention relates to a method for manufacturing a packaging paper tube in which oiled paper is provided so as to be able to slide against a paper tube body. Conventionally, the steps of forming the paper tube body and providing oiled paper were performed separately in terms of time. This is an improved manufacturing method that allows the process to be carried out in one step.

Paper tubes are made using a one-way spiral winder using the following process. Wrap a long strip of paper around a mandrel. At this time, the banding paper should be placed so that the edge of the banding paper meets the
Can be wrapped under Z conditions. This condition is based on the width of the obi paper.
If the diameter of the mandrel is the diameter of the mandrel, and the angle between the longitudinal direction of the band and the axis of the mandrel is θ (<90°), then the formula 1 Q-πDCO8θ (π is pi) is satisfied. If the width is larger than the width of the strip, the strips will be overlapped by that width, and if the width is smaller than the width of the strip, there will be a portion of the mandrel that cannot be completely covered.

The strip of paper that is wrapped directly around the mandrel is called a one-page program, and no adhesive is applied to the one-page program.

Furthermore, the banding paper that is wrapped on top of it is the second paper.

The width of these strips is determined by taking into account the thickness of the strips already wrapped, and the conditions for collision are slightly wider intersections than in equation 1. However, the winding of the front number paper is at a position shifted by half the pitch, and the same winding is at the front gf at an angle.
A thick paper tube is continuously formed by wrapping a band of paper coated with adhesive on one side that is in contact with the i-paper.

The paper tube made in this way is moved in the axial direction while rotating on the mandrel, and sent as it is to the cutting process.
Cut into paper tubes with a certain quality.

That is, an inner-blade cutter that moves at the same speed as the paper tube is formed and advances toward the axis is pressed against the paper tube, and the paper tube is cut using the rotation of the paper tube to form a paper tube. The inner blade cutter periodically repeats moving cutting and returning to the cutting start position, and adjusts the length of the paper tube depending on the length of the cycle to obtain a paper tube of a desired length.

In the present invention, the outermost layer of the paper tube, the largest paper band, is not the normally used liner paper or paper tube base paper of about 260 g/m, but is made of thin kraft paper of about 50 g/m, and the band paper Chinese sentence 9 whose width is the collision mentioned above
The paper tube is made larger than the paper tube, and because it is made wider, adhesive is applied only to the overlapping edges that occur due to wrapping, and the paper tube is formed. A paper tube is formed on the inner layer of paper, which is not bonded.

Next, for cutting, an auxiliary inner blade cutter is installed at a distance of about half the length of the paper tube from the inner blade cutter for cutting the paper tube, and the inner blade cutter for cutting is set to cut only the outermost layer of the paper tube. , -. Therefore, in the manufactured paper tube, only the top layer is cut at the longitudinal center, and the outermost layer not bonded to the inner layer is cut at -4 in the axial direction of the paper tube. - It becomes possible to move toward both opening ends in the direction; b
It is.

A paper tube container with oiled paper produced by the method of the present invention is made by extending this movable outermost layer from both ends of the paper tube to form oiled paper.

The present invention will be explained below with reference to the drawings.

FIG. 1 is a plan view showing the main part of the paper tube forming process, and shows an example in which the paper tube R is made of three strips of paper from program 1 to number 3, where number 3 is It is a thin kraft paper that is to be used as oil paper, and has a width larger than the width of the first program 1° and the width ρ, Q' of the second paper 2, and the entire surface of the second paper 2 in contact with the first program 1 and the third paper Adhesive is applied to the overlapping edges of the parts 3 and 3 before wrapping. The application range is indicated by diagonal lines. M represents a mandrel, and D and θ are the same as in formula 1 above.

The rotational force for winding and forming the paper cylinder R is not shown in the figure. .

FIG. 2 is an enlarged cross-sectional view showing the winding state of each band paper of the formed paper cylinder R. The second paper 2 is wrapped half a pitch apart from the butt and its entire surface is glued to each other, but the third paper 3 is glued only at the overlapping edges, and is not glued at all to the inner layer of the second paper 2. This is something that has not been done yet.

Fig. 3 is a perspective view of a paper tube P cut and manufactured by a cutting mechanism equipped with an auxiliary inner blade cutter, in which only the third paper 3 of the top layer is cut and divided in the center, and the left side part is a sliding part. The broken line shows the oil paper S extending from the end of the paper tube P.

FIG. 4 is an enlarged side view, partially in section, showing a state in which the paper tube P has accommodated the calendar C in the form of a long roll, and then the oiled paper S has been retracted inward from the opening at the end of the paper tube P. Yes, contents C
Since the static frictional resistance between the second paper 2 and the third paper 3 is sufficiently large compared to the weight of the oil paper S, the content C is
is retained without escaping from the paper tube P, and is sufficiently suitable for practical applications such as mailing.

-6- Note that cutting only the top layer does not necessarily have to be performed at the same time as cutting the paper tube, and processing can also be carried out after the paper tube is manufactured and when actually used as a container.

- As mentioned above, according to the present invention, by using existing paper tube manufacturing equipment as is, the process of preparing oil paper, which was previously required separately, can be eliminated by simply changing the operating conditions and installing an auxiliary cutter. This can be omitted and is a revolutionary method for manufacturing low-value products such as paper tubes.

In addition, since the product paper tube does not have oiled paper extending out, the storage efficiency is improved in terms of volume, and when storing the contents, the oiled paper does not extend out, making it easier to store the contents.
Handling has also been significantly improved. Furthermore, since the length of the paper tube can be approximately the same as the length of the contents, there is also the advantage that the cost of postage can be kept low.

[Brief explanation of drawings]

Fig. 1 is a plan view showing the main parts of the culm that forms the paper cylinder according to the method of the present invention, Fig. 2 is an enlarged sectional view showing the stacked state of the band paper of paper cylinder -7- according to the method of the present invention, and Fig. 3 is achieved by the method of the present invention! FJ is a perspective view showing a manufactured paper tube, showing a state in which oiled paper extends from one end. Figure 4 is an enlarged side view, partially in cross section, showing the state in which the contents are accommodated in the paper tube and oiled paper is rolled in. 1...First program 2...Second paper 3.・Third paper R・
...Paper tube P...Paper tube S...Oil paper patent applicant Johoku Shigyo Co., Ltd. -8-

Claims (1)

[Claims] When continuously forming paper tubes using a single spiral winder, adhesive is applied only to the edge of the band paper that forms the outermost layer, so that the outermost layer is not bonded to the inner layer. A method for producing a packaging paper tube in which the outermost layer is capable of moving once relative to the paper tube by cutting and dividing only the outermost layer at the longitudinal center of the paper tube at the same time as or after cutting the paper tube into the paper tube. .