JP2639791B2 - Method of manufacturing paper tube stopper - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a paper tube stopper for fitting to a tube end of a paper tube.

[0002]

2. Description of the Related Art Conventionally, a plastic molded product is used exclusively for a paper tube as a paper end stopper.

[0003]

The plastic paper tube stopper member fixed to the end of the paper tube cannot be incinerated together with the paper tube at the time of disposal after use because of plastic. If this is separated from the paper tube, it will take a lot of trouble.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention uses a paper tube stopper which is specially constructed by using a paper material. In the cap body, a large number of wavy waves are radially formed on the flange portion and the peripheral portion near the flange portion of the central projection body. While pulling out, impregnated in the fortifying agent liquid and dried, this is sandwiched between two upper and lower donut disk-shaped female molds that form radial sawtooth grooves in the circumferential direction from the center, and a donut-shaped circle from above Insert the male mold of a convex circular body that is smaller than the circular hole diameter of the board by the thickness of the light-weight sheet or interleaf paper, and press it for a certain period of time. A number of wavy grooves are formed radially around the periphery of the body.

[0005]

The suitability at the end of the paper tube is good and the shock resistance is excellent.

[0006]

FIG. 1 schematically shows a method of manufacturing a paper tube stopper according to the present invention, wherein A is a base paper obtained by punching a light-weight sheet or interleaf paper having a certain thickness into a disc shape. B is a state diagram in which the base paper 1 is immersed in the reinforcing agent tank 2. Here, the reinforcing agent liquid used is a solution obtained by dissolving vinyl acetate in water at a fixed ratio. According to various experimental examples of the present inventor, the ratio of the former to the latter is 2: 1. It was also extremely excellent in terms of moldability and the like.

The immersion time in the reinforcing agent liquid tank 2 is about several minutes, and it is pulled up and dried. Fig. C shows this base paper 1 ', and the drying time is about 10 at room temperature.
Minutes to about 15 minutes.

FIG. D shows the female mold 3 and the male mold 4 used in the present invention.
The female die 3 is a donut-shaped disk, and has a number of radial saw-tooth grooves p formed in the circumferential direction from the center of the inner hole 3a. On the other hand, in the male mold 4, a convex circular body 4a having a diameter s' which is smaller than the inner hole diameter s of the female mold 3 by the thickness of the base paper 1 (2t when the thickness is t) is formed at the center. And a sawtooth groove p is formed on the outer peripheral surface.

FIG. E is a diagram showing a state in which a base paper 1 ′ impregnated with a reinforcing agent liquid is pressed and pressed on a base plate 5 via a press head 6 using the male and female molds. It is made to clamp between the prepared male molds 3,3. At this time, the convex circular body 4a of the male mold 4 is inserted into the inner hole 3a of the female mold 3, and is pressed from above with the head 6 of the press machine for a certain time to produce a flanged cap. To do so.

FIG. 2 is a perspective view showing the formed paper tube stopping member 7 after the above-mentioned press-pressing. The formed annular member 7a of the member 7 and the peripheral edge k of the central projection 7b near the flange portion are formed. A large number of wavy grooves p 'which are sometimes formed are engraved.

FIG. 3 is a diagram showing the state of use of the paper tube stopper 7, in which the paper tube 8 is fitted and stopped from the outside to the tube end (only one side is shown in the drawing). Reference numeral 9 denotes a material to be wound wound on the paper tube 8, and reference numeral 10 denotes a side cap used for protecting the periphery of the material to be wound.

The lightweight sheet used as the base paper 1 has a thickness of 1
mm, 2 mm, 3 mm, etc., of which 2 mm is extremely excellent in formability and shape retention, and is optimal in strength, air permeability, etc. The weight of the product is 470 g / m ² ,
A density of 0.24 g / cm ² is used. Although the above description relates to a lightweight sheet, a sheet using interleaving paper may be used. With interleaf paper, it can be taken out without requiring time for pressure pressing.

[0013]

The paper tube stopper 7 manufactured according to the present invention.
Since the wavy groove p 'is engraved on the peripheral edge k near the flange of the projection 7b, it can be resiliently fitted into the mouth of the paper tube 8, thereby facilitating the fitting operation. In addition, the holding of the adhesive is sufficient and it is extremely difficult to come off after fitting. Further, the wavy groove p 'in the flange portion is very effective in exhibiting a buffering action at the time of contact during handling or transportation of the product. It should be noted that the paper tube 8 using the product of the present invention can be incinerated as it is after use, and is easily post-processed and does not cause a pollution problem as compared with a product using a conventional plastic product.

[Brief description of the drawings]

FIG. 1 is an explanatory view schematically showing a method of manufacturing a paper tube stopper according to the present invention.

FIG. 2 is a perspective view of a paper tube stopper manufactured as described above.

FIG. 3 is a use state diagram.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Base paper 2 Reinforcement liquid tank 3 Female type 4 Male type 6 Pressing head 7 Paper tube stop member 8 Paper tube

Claims (2)

(57) [Claims] 1. A light weight sheet or interleaf paper having a certain thickness is punched into a disk shape, impregnated in a reinforcing agent liquid, and then dried to form radial sawtooth grooves from the center in the circumferential direction. Between the upper and lower two donut disk-shaped female molds, and the male mold of a convex circular body that is smaller than the diameter of the hole of the donut-shaped disk by the thickness of the light-weight sheet or interleaf paper from above. A method for manufacturing a paper tube stopper, wherein a plurality of wavy grooves are radially formed in a flange portion and a peripheral portion of a central projection by a flanged cap body by press-fitting for a predetermined time. 2. The thickness is about 2 mm and the density is about 0.25.
g / cm ² as a reinforcing liquid, impregnated with vinyl acetate dissolved in water at a ratio of about 2: 1 for about 5 minutes, dried for about 10 to 15 minutes, and dried for about 35 minutes.
2. The method for manufacturing a paper-made paper tube stopper according to claim 1, wherein the member is manufactured by pressing at 0 kg pressure for about 1 minute.