JPH0423624Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a jig used for sealing a thick hard plastic sheet, for example, 0.4 mm thick, into a cylindrical shape using a high-frequency sealing machine.

(Prior art) Conventionally, in order to seal a thick hard vinyl chloride resin sheet into a cylindrical shape, the width of the seal mark △l is added to the length πd of the predetermined diameter, which is the length l = πd + △l, and the height h. The cut vinyl chloride resin sheet 1 as shown in Fig. 18 is made into a cylinder as shown in Fig. 19, and the width of the seal is △.
The sheet 1 is held down from the inside by a seal receiving bar 2 of l, and high-frequency sealing is performed by a seal width Δl in accordance with the position of the seal bar 3 by visual measurement.

In addition, in other methods, as shown in FIG.
The sheet 1 is wrapped around a seal receiving jig 4 in the shape of a round bar, and high-frequency sealing is performed using a seal bar 3 for a seal width Δl.

(Problems to be solved by the invention) Among the above sealing methods, in the former shown in FIG. 19, the sealing position is not stable;
The accuracy of the inner diameter d and the height h direction as shown in Fig. 7 cannot be achieved.

In the case of the latter shown in FIG. 20, since a certain amount of clearance is required, inner diameter accuracy cannot be achieved. In addition, in the case of thick hard PVC resin sheets, it is difficult to fix the seal width △l constant because of the repulsive force of the material itself, and if the cooling after sealing is not sufficient, the seal will deform and the cylinder will become distorted. Since it is curved and deformed, roundness cannot be achieved. Furthermore, the shape of the seal stitches tends to vary depending on the conditions of high frequency sealing.

For example, warpage and distortion at the seal width end Whitening of seal eyes (foaming) Peeling due to poor adhesion occurs.

(Means for solving the problem) Therefore, the technical problem of the present invention is to provide a jig used for sealing a hard plastic sheet into a cylindrical shape that is stable in adhesive strength and finished dimensional accuracy. The technical means of the present invention to solve this technical problem is to form a working gap between the seal bar and the seal receiving bar on the upper surface, and to form a hollow part inside where the seal receiving bar is inserted. The inner surface of the left and right side walls to be formed has a semicircular arc shape in cross section, and the jig main body has a length commensurate with the height of the cylindrical body to be sealed. This is a jig for sealing a hard plastic sheet such as hard vinyl chloride resin into a cylindrical shape, consisting of a pair of left and right inner pieces that are attached to the jig body so that the gap can be freely adjusted so as to form a constant gap with the wall surface. .

(Effect of the invention) According to this technical means, the inner wall surface of the semi-circular jig body receives the repulsive force of the hard plastic sheet, and both ends of the hard plastic sheet to be sealed are held between the silver and the seal receiving bar. It works to maintain the seal in the proper position, and even if there is a repulsive force on the hard vinyl chloride resin sheet, it is supported by the jig body and the inner piece, so the shape of the seal part is reliably maintained. Ensures high frequency sealing. Therefore, there is no warpage or distortion at the width end of the seal, and there is no peeling due to poor adhesion.

Therefore, a product with stable finished dimensional accuracy, stable seal shape, and stable adhesive strength can be obtained. Incidentally, if a 0.4 mm thick sheet is sealed into a cylindrical shape, the inner diameter error can be within 0.25 m/m. Moreover, since the attachment of the inner piece is adjustable, it can be adapted to the thickness of the hard vinyl chloride resin sheet.

The conventional method of high-frequency sealing thin (0.35 m/m or less) hard vinyl chloride resin sheets and soft vinyl chloride resin sheets lacks stability in adhesion accuracy and finished dimensional accuracy, so thick hard vinyl chloride resin sheets are used. It is said that sheet cylinders are difficult to mass produce, but if the sealing jig of the present invention is integrated, it is possible to seal a large number of seals at the same time, and therefore full automation is planned and mass production is possible.

Additionally, it is possible to seam flanged lid materials using a sealing machine for can manufacturing, thereby significantly improving the production rate compared to existing manual seamers.

In any case, by using the special jig according to the present invention and setting the optimum conditions for high-frequency sealing, a cylindrical body with stable quality can be manufactured.

Furthermore, due to the stability of accuracy and the fact that it can be applied to high-speed automatic filling seamer machines without major changes in conditions, we can expect that see-through PVC cans with airtightness and durability will be used in a wide range of applications, and conventional aluminum cans and tin cans are It can also be used for packaging with an excellent design that would otherwise be difficult to obtain. For example, seeds, pet feed, tree feeder, etc.

Furthermore, if the vinyl chloride resin sheet material is improved, it can also be used for liquids and foods.

(Example) The embodiments shown in the drawings will be described below.

Reference numeral 5 shown in FIG. 12 is a jig main body having a hollow interior, and a working gap 6 between the seal bar 3 and the seal receiving bar 2 is formed in the surface thereof.

Further, the inner wall surfaces 7a, 7a of the left and right side walls 7, 7 have a semicircular arc shape in cross section, and the length of the jig body is set to match the height of the cylindrical body. Reference numeral 8 denotes an inner piece having an outer peripheral surface 8a having substantially the same shape as the inner wall surfaces 7a, 7a, and is attached to the jig main body 5 so as to form a constant gap with the inner wall surface 7.

The jig main body 5 is formed to a predetermined dimension l=πd+△l in order to make the sheet cylindrical, and its inner wall surface 7a can receive the repulsive force of the vinyl chloride resin sheet itself. The inner diameter can be finely adjusted using the inner piece 8.

As shown in FIG. 13, the seal bar 3 has a baked plate 9 mounted on the brass seal bar 3a, and the bottom surface of the seal bar 3a has an uneven surface 10 forming a sealing hole.
is formed, and this is covered with Teflon tape 11.

Therefore, if such a seal bar is used, the 14th
The shape of the vinyl chloride resin sheet shown in the figure before sealing becomes as shown in FIG. 15 after sealing.

To explain the jig of the present invention in more detail based on FIGS. 1 to 11, the jig main body 5 has a bottom plate 12.
The left and right side walls 7, 7 are screwed onto the top, and the left and right top plates 14, 14 are screwed onto the upper surfaces of the left and right side walls 7, with a certain gap 6 therebetween.

In addition, the inner pieces 8, 8 are attached to the L-shaped back walls 13, 13 of the left and right side walls 7, 7 with bolts 15, 15, and these bolts 15, 15 are inserted into the long holes 16, 16 of the back walls 13, 13. The mounting positions of the inner pieces 8, 8 can be adjusted along the elongated holes 16, 16. Also, depending on the size of the cylinder, the bottom plate 1
2. The side wall body 7 may be attached by changing the top plate 14.

FIG. 16 shows a system in which sealing jigs are integrated to seal a large number of seals at the same time.

That is, a predetermined vinyl chloride resin sheet 1 is inserted into jig a. Next, this is accumulated in guides 17 and 18 of a high frequency sealing machine. The shape of the seal bar 3 is set as shown in FIG. Next, high-frequency sealing is performed by determining sealing conditions (high-frequency oscillation time, pressurizing force, and cooling time) according to the capacity of the high-frequency sealing machine so that the state of the sealed portion is 15th.

As described above, production efficiency can be increased by using several jigs a at the same time depending on the mechanical capacity and space of the sealing machine.

[Brief explanation of drawings]

Figure 1 is a front view of the proposed jig, Figure 2 is a cutaway plan view of the same as above, Figures 3 and 4 are a cutaway view and front view of the side wall body, and Figures 5 and 6 are a plan view and cutaway view of the top plate. Figures 7 and 8 are the plan view and cross-sectional view of the bottom plate, and Figures 9 and 1.
Figures 0 and 11 are a side view, front view, and plan view of the inner piece,
Figure 12 is a usage state of the proposed jig, Figure 13 is a cross-sectional view of the seal bar, Figures 14 and 15 are partial cross-sectional views showing the sealing state before and after sealing, and Figure 16 is the jig. State diagram for integrating and using
7, 18, and 19 are explanatory diagrams of a conventional example, and FIG. 20 is an explanatory diagram of another conventional example. 1... Sheet, 2... Seal receiving bar, 3...
Seal bar, 5... Jig body, 6... Operation gap between seal bar and seal receiving bar, 7... Left and right side walls, 8... Inner piece, 12... Bottom plate, 14... Top plate.

Claims (1)

[Scope of utility model registration request] In a jig for sealing a hard plastic sheet such as hard vinyl chloride resin into a cylindrical shape, a working gap between a seal louver and a seal receiving bar is formed on the upper surface, and a hollow part is formed inside where the seal receiving bar is inserted. a jig main body having an inner surface shape of the left and right side walls forming a semicircular arc shape in cross section and a length commensurate with the height of the cylindrical body to be sealed, and an outer circumferential surface having substantially the same shape as the inner wall surface; A jig for sealing a hard plastic sheet into a cylindrical shape, characterized by comprising a pair of left and right inner pieces that are attached to a jig body so that the gap can be freely adjusted so as to form a constant gap with the inner wall surface.