JPH0872850A - Preventive device of flap piece from dropping out - Google Patents

Abstract

PURPOSE: To prevent a flap piece fitted in a paper tube from dropping out into the inside thereof, by providing a groove inward protruding from the outer peripheral face of the paper tube, in the rear position of the flap piece fitted in the front end of the paper tube. CONSTITUTION: A core rod 6 of which front end 6a is a little thinner diametral part than the base end part, is fitted from the rear end of a paper tube 1 of which front end is curled inside. Embossing rollers 8, 8 having a trapezoidal section for forming 8 groove are pressed on the front end 6a of the core rod 6, having a little thinner diameter 7 than the core rod and rotated from the right and left sides of the periphery of the paper tube 1, at the front end of paper tube 1 and also at the rear part as much as the thickness of flap piece 3 from the curled part 2, to form a trapezoidal groove 4 projected inward. In this way, the flap piece 3 can be put in between the curled part 2 of paper tube 1 and the groove 4 and hence, it is prevented from dropping out into the inside of paper tube 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a facet fall-off prevention device which prevents a facet inserted into a paper tube from falling inside the paper tube by pressing from the tip.

[0002]

2. Description of the Related Art Conventionally, the face of a paper tube is pushed in from the back of a curl portion in which the tip of the paper tube is curled inward, and the friction is generated between the side surface of the face and the inner surface of the paper tube. Does not fall inside the paper core.

[0003]

Since the facet is pushed in from the back of the curl portion at the tip of the paper tube curled inward so that the facet does not fall into the inside of the paper tube only by frictional force, the facet is placed inside the paper tube. When a pressing force is applied toward the surface, the facet is easily dropped inside the paper tube.

It is an object of the present invention to provide a facet fall-out prevention device which prevents a facet fitted into a paper tube from falling inside the paper tube.

[0005]

In order to achieve this object, the present invention inserts a faceted piece of cardboard cut from the rear end of a paper tube whose front end is curled inward, and positions it behind this facet. A groove that projects inward is provided on the outer circumference of the paper tube.

[0006]

The cardboard 1 having the curl portion 2 whose front end is curled inward is inserted into the cardboard 3 which is cut so that the cardboard can be inserted into the cardboard, and the cardboard 3 is located behind the cardboard 3. A groove portion 4 that projects inward is provided on the outer periphery of the paper tube 1. Therefore, the face 3 is supported by the curl portion 2 of the paper tube 1 whose end portion is curled inward and the groove 4 which protrudes inward, so that the face 3 can be prevented from falling into the paper tube 1.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The following is a detailed description with reference to the accompanying drawings showing an embodiment of a facet removal prevention device according to the present invention.

FIG. 1 is a perspective view showing a device for preventing a facet from falling off according to the present invention, FIG. 2 is a sectional view taken along the line AA of FIG. 1, and FIG. 3 shows a method for forming a groove on the outer periphery of the front end of a paper tube. It is an explanatory view shown. 4 and 5 show the inward curling process at the tip of the paper tube, and FIG. 6 shows another application in which the groove portion according to the present invention is used for fitting the plastic cap at the mouth of the paper tube container. Is shown.

Reference numeral 1 shown in FIGS. 1 to 3 denotes a paper tube, and as shown in FIGS. 4 and 5, a curling die 5 is pressed against the tip 1a of the paper tube 1 while rotating the curling die 5. The curl portion 2 is formed inwardly. This curling process is well known and widely used.

Reference numeral 3 is a tip 1 curled inward of the paper tube 1.
The front end of the paper tube 1 is closed by a faceted sheet which is pressed into contact with a and is cut into a circular shape.

Reference numeral 4 denotes a lateral trapezoidal groove formed so as to project inward on the outer periphery of the tip of the paper tube 1, and as shown in FIG. 2, the curled tip 1a of the curl portion 2 formed on the paper tube 1. It is formed downward by the thickness of the face piece 3.

As shown in FIG. 3, the groove portion 4 extends from the rear end portion of the paper tube 1 in which the front end portion is curled to the front end portion 6.
The mandrel 6 in which the diameter a is slightly smaller than the base end is inserted. Then, at the leading end of the paper tube 1, the curl portion 2
The groove portion forming embossing rollers 8 having a trapezoidal cross section are pressed backward from the left and right of the outer periphery of the paper tube 1 by the thickness of the above to the tip portion 6a of the above-described mandrel 6 which is a slightly reduced diameter portion 7 and rotated. The paper tube 1 is formed so as to project inward on the outer circumference of the above-mentioned tip portion.

By forming the groove portion 4 on the outer periphery of the front end portion of the paper tube 1, the face 3 can be sandwiched between the curl portion 2 of the paper tube 1 and the groove portion 4 formed on the outer periphery of the front end portion of the paper tube 1. ,
The face 3 is prevented from falling into the paper tube 1.

FIG. 6 shows another application of the groove portion according to the present invention. The mouth portion of the paper tube container 9 whose bottom portion is closed (not shown) by using the facet fall-off prevention device according to the present invention. 3 shows an example in which the plastic cap 10 is fitted in.

The tip of the mouth of the paper tube container 9 is curled inward as described above to form the curl portion 2.
A lateral trapezoidal groove portion 4 protruding inward is provided immediately behind the outer periphery of the paper tube 1 where the tip 1a of the paper tube 1 contacts the inner surface. The plastic cap 10 has a projection 11 formed below the inner surface thereof and fitted into the laterally trapezoidal groove 4.

Accordingly, since the projection 11 formed below the inner surface of the plastic cap 10 is inserted into the laterally trapezoidal groove 4 which is formed on the outer periphery of the mouth of the paper tube container 9 and projects inward, the plastic cap 10 is made of paper. It fits into the mouth of the pipe container 9 without falling off.

[0017]

EFFECTS OF THE INVENTION The curl portion 2 of the paper tube 1 whose end portion is curled inwardly, and the lateral trapezoidal groove portion which projects inwardly toward the outer periphery of the front end portion of the paper tube 1 behind the curl portion 2 by the thickness of the face 3 4 is formed, the face 3 can be interposed between the curl portion 2 and the groove portion 4. Therefore, the face 3 does not easily fall off the paper tube 1 and the paper tube 1 can be made strong.

Further, since the groove portion 4 is provided on the outer periphery of the mouth of the paper tube container 9 whose upper end portion is curled inwardly, and the projection 11 of the plastic cap 10 is fitted into the groove portion 4, the plastic cap 10 is the paper tube container 9 It does not come off easily from the mouth of. Therefore, if it is used in containers such as seaweed and confectionery, it will exert an airtight effect, and the contents such as seaweed and confectionery will get damp, and dust will be mixed into this content, resulting in unsanitary conditions. Absent.

[Brief description of drawings]

FIG. 1 is a perspective view of a main part of a paper tube provided with a facet removal prevention device of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

3 is an explanatory view showing a method of forming a groove on the outer circumference of the front end of the paper tube, and a sectional view similar to FIG.

FIG. 4 is a cross-sectional view of a main part showing a curling process of the leading end of the paper tube, which is taken immediately before the curling process is started.

FIG. 5 is a cross-sectional view of a main part showing a curling process of the leading end of the paper tube, which is taken immediately after the curling process is completed.

FIG. 6 is a sectional view similar to FIG. 2, showing another application in which the groove of the present invention is used for fitting a plastic cap to the mouth of a paper tube container.

[Explanation of symbols]

 1 Paper Tube 2 Curl Section 3 Facer 4 Groove Section 5 Curling Die 6 Mandrel 6a Tip Section 7 Small Diameter Section 8 Embossing Roller for Groove Section 9 Paper Tube Container 10 Plastic Cap 11 Protrusion

Claims (1)

[Claims] 1. A cardboard cut face is inserted from the rear end of a paper tube whose front end is curled inward, and a groove portion projecting inward is provided on the outer periphery of the paper tube located behind this card. A device for preventing removal of a face, which is characterized in that