JPH03288634A - Manufacture of container made of synthetic resin - Google Patents

Abstract

PURPOSE:To manufacture a predetermined configuration container made of synthetic resin by successively molding a container configuration part in the direction of a sheet material, and thereafter, cutting the periphery of each container configuration part for separating from the sheet material and thus forming container configuration materials, and further, cutting the side wall of the container configuration material in a direction approximately intersecting therewith. CONSTITUTION:When the rows of container configuration parts Y formed on a sheet material X are supplied and then positioned on a cutting device 3, cylindrical blades 4a are moved in order to be outwardly fitted around each container configuration part Y, further, they are pressed against receiving dies 4c via stepped parts Y1, whereby each container configuration part Y is cut in its periphery, and in consequence separated from the sheet material X. By remaining the container configuration material Y' rotated, a rotary cutter 5b is moved from the side of the container configuration material Y' toward a rotationally receiving die 5c so that it is put into press contact with the upper part peripheral surface of a side wall Y2 at the lower side position of the stepped part Y1 in a direction intersecting therewith and toward the rotationally receiving die 5c, whereby the side wall Y2 of the container configuration material Y' is cut into a peripheral shape and the opening end part of the container configuration material Y' containing the stepped part Y1 is separated from the container configuration part Y', thus obtaining a container.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a method for manufacturing a synthetic resin container.

(Prior art) As a method for manufacturing synthetic resin containers such as plastic cups, a belt-shaped sheet material is molded from a thermoplastic synthetic resin, and one of the sheet materials is held at a temperature at which it can be molded. A method of manufacturing a container is known in which a plurality of parts are press-molded from a surface, the parts are stretched into a container shape, and the periphery of the container-shaped part thus formed in the sheet material is cut. . This method allows a large number of containers to be obtained from the sheet material, and is suitable for mass-producing containers made of synthetic resin.

When using such a method to mass produce a cylindrical synthetic resin container P having a ring-shaped flange Q (indicated by a phantom line) at the opening end, as shown in the first diagram, usually, as shown in the second diagram, Multilayer sheet material
is fed in the longitudinal direction, and during the feeding, first, the container forming device 2 presses, for example, upwardly a plurality of portions of the sheet material It is molded and stretched into a container shape,
Rows of the plurality of container-shaped portions Y are sequentially formed at appropriate intervals in the longitudinal direction as the sheet material X is supplied, and the container-shaped portions Y are arranged on the sheet material X in a lattice pattern.

Next, the sheet material X is supplied to the cutting device 3 for each row of container-shaped portions Y while being cooled, and cylindrical blades are arranged in parallel in the cutting device 3 corresponding to each of the plurality of container-shaped portions Y on the same row. 4a, the periphery of each container-shaped part Y is simultaneously cut for each row, and each container-shaped member Y' is separated from the sheet material X, and a container P is obtained. At this time, the sheet material When a plurality of container-shaped parts Y are supplied to the cutting device 3, there are many cases in which mutual positional deviation occurs and the container-shaped parts Y are not lined up in a line at equal intervals. Therefore, there are cases where the container-shaped portion Y is cut around the cylindrical blade 4a in a state where the axis does not match, and the outer circumference of the flange Q of the container P obtained in such a state is aligned with the container P and the axis. It becomes a shape that does not match the heart.

In this cutting, each container shaped portion Y is cut into the cylindrical blade 4a.
Even if the sheet material X is forcibly positioned against the flange Q, the sheet material
The outer periphery of the container P is shaped so that its axis does not coincide with that of the container P.

Therefore, in manufacturing the container P as described above, the periphery of the container shape portion Y is usually cut at a diameter sufficiently larger than the desired outer diameter of the flange Q, and after the cutting, the trim device 5 shown in the second figure Each container P is positioned and its flange Q is trimmed in its axial direction by a cylindrical blade or the like (not shown), so that the container P has a desired shape at the flange Q.
It is formatted to have the following. This also applies when mass producing the container P shown by the solid line in FIG. After cutting, it is trimmed into the desired shape.

However, in order to cut the periphery with a sufficient margin between the container-shaped parts Y and the container-shaped parts Y as described above, the container-shaped parts Y must be attached to the sheet material X with a sufficient gap between adjacent ones. For this reason, the container forming device 2 and the cutting device 3 become larger, and it becomes difficult to simultaneously form a large number of container-shaped portions Y on the sheet material X, resulting in a decrease in yield. was.

(Problems to be Solved by the Invention) The present invention solves the inconvenience caused by bending, and forms a plurality of container-shaped parts in a belt-shaped sheet material made of thermoplastic synthetic resin, and separates the container-shaped parts from the sheet material. An object of the present invention is to provide a method for manufacturing a synthetic resin container by forming container-shaped portions on the sheet material at small intervals from each other to manufacture a synthetic resin container having a predetermined shape.

(Means for Solving the Problems) In order to achieve the above object, the first aspect of the method for manufacturing a synthetic resin container of the present invention is to continuously mold a heated and melted thermoplastic synthetic resin. A container-shaped portion is formed by pressing a strip of sheet material supplied longitudinally at a temperature maintained at a temperature from one side of the sheet material in a row in the width direction until it stretches into the shape of a plurality of containers. The material is sequentially formed in the longitudinal direction, and then the periphery of each container-shaped part is cut and separated from the sheet material to form a container-shaped member, and the side wall of the container-shaped member is cut in a direction substantially perpendicular to this. It is characterized in that it is formed into a container of a predetermined shape.

Further, the second aspect of the present invention is to continuously mold heated and melted thermoplastic synthetic resin to form a belt-shaped sheet material that is supplied in the longitudinal direction while being maintained at a moldable temperature. Container-shaped portions are press-molded from the sheet material until they are stretched in a row in the width direction into the shape of a plurality of containers, and the sheet material is sequentially formed in the longitudinal direction, and then the side walls of each container-shaped portion are formed in a direction substantially perpendicular to this. The container-shaped portion is cut into a container having a predetermined shape.

(Function) According to the first aspect of the present invention, the side wall of each container-shaped member separated from the sheet material by cutting the periphery of each of the container-shaped parts formed in the sheet B, 1 is abbreviated as this. Since the cutting is performed in the perpendicular direction, the shape of each container-shaped member by cutting the side wall is not influenced by the shape of the surrounding portion of each container-shaped member at the time of cutting from the sheet, and the shape is a predetermined shape. The desired synthetic resin container is obtained.

Therefore, when cutting the periphery of each container-shaped part formed on the sheet material, there is no problem even if the periphery is cut at a position relatively close to the container-shaped part, and each container-shaped part is cut relative to the other. It becomes possible to form the sheet material with a small interval between the two.

According to the second aspect of the present invention, the side wall of each container-shaped portion formed on the sheet material is cut in a direction substantially perpendicular thereto, so that the shape of each container-shaped portion by the cutting is as follows: A desired synthetic resin container can be obtained by being formed into a predetermined shape without being affected by the mutual spacing between the container-shaped parts.

(Example) As an example of the first aspect of the present invention, a method for manufacturing a container P having no flange Q is shown in FIGS. 1 to 3 (a) to (d).
).

FIGS. 3(a) to 3(d) are explanatory diagrams for explaining the method of cutting the container-shaped portion, which is the essential part of the present invention.

In this manufacturing method, as described above in FIG. 2, the periphery of each container shape portion Y formed in a lattice shape on the sheet material X is cut by the cutting device 3 as described below. After separating from the sheet material X to form a container-shaped member Y', the trim device 5 cuts the side wall of the container-shaped member Y' as described below to produce a container P shown in solid line in FIG. This is how it was done.

Each container-shaped portion Y formed on the sheet material X is shown in FIG. 3(a).
As shown, they are arranged in parallel in the width direction of the sheet material X, and each row is supplied to the cutting device 3 and positioned. Cutting device 3
As shown in FIG. 3(a), a punch 4b having a cylindrical blade 4a at the tip provided on the bottom side of the container-shaped portion Y, and a disk-shaped punch 4b provided on the opening side of the container-shaped portion Y. A die cutter 4 is provided with a punch 4d having a receiving die 4c at its tip, and the cylindrical blade 4a and the receiving die 4C face each other at equal intervals in the width direction of the sheet material X corresponding to each container shaped portion Y on the same row. They are arranged side by side.

Then, when the row of container-shaped parts Y is supplied to the cutting device 3 and positioned, each cylindrical blade 4a and receiving die 4c face each other with each container-shaped part Y in between, and the receiving die 4c is connected to each container-shaped part Y.
The cylindrical blade 4a is moved toward the stepped portion Y formed circumferentially at the open end of the container and is pressed against the stepped portion Y1, and at the same time, the cylindrical blade 4a is moved toward each container-shaped portion Y and presses against the stepped portion Y1. Y, and is further pressed toward the receiving die 4C via the stepped portion Y, whereby each container-shaped portion Y is cut at its periphery and separated from the sheet material X.

At this time, the inner diameter of the cylindrical blade 4a is set to be between the outer diameter and the outer diameter of the container-shaped part Y. However, at the open end of the container-shaped member Y' separated from the sheet material Figure (b)
As shown, a portion of the step portion Y remains in the form of a flange.

Next, this container-shaped member Y' is supplied to the trim device 5, and its side wall Y2 is cut as shown in FIG. 3(C). That is, the trim device 5 includes a rotary support base 5a, a rotary cutter 5b, and a disc-shaped rotary receiving die 5c for the container-shaped member Y', and as shown in FIG. 3(C), the container-shaped member Y' is The bottom surface is adsorbed and held by the rotary support base 5a and is rotatable around its axis together with the rotary support base 5a,
The rotary receiver die 5c is pressed against the inner circumferential surface of the upper part of the side wall Y2 of the container-shaped member Y'', and is rotatable about its own axis as the container-shaped member Y'' rotates. Then, while the container-shaped member Y" is being rotated, the rotary cutter 5b is moved from the side of the container-shaped member Y" toward the rotary receiving die 5c, and at a position below the stepped portion Y, the rotary cutter 5b is moved from the side of the container-shaped member Y" to the side wall Y2. The side wall Y2 of the container-shaped member Y'' is cut into a circumferential shape to form a container including the stepped portion Y. The open end of the shaped member Y' is separated from the container shaped member Y' to obtain a container P as shown in FIG. 3(d).

In this way, the container P is obtained by circumferentially cutting the side wall Y2 of the container-shaped member Y'' separated from the sheet material X in a direction perpendicular to the side wall Y2. It is formed regardless of the shape of the portion Y1, and when the container-shaped portion Y is separated from the sheet material X, even if the stepped portion Y1 becomes distorted due to the shrinkage of the sheet material X as described above, the container P can be removed without any problem. is formed into the desired shape.

Therefore, there is no need to provide a large gap between the cutting position when cutting each container shape part Y from the sheet material X and each container shape part Y, as in the past, and the mutual distance between the container shape parts Y can be reduced. However, as in this embodiment, by making the cylindrical blade 4a of the die cutter 4 have a diameter smaller than the outer diameter of each container shape portion Y, it is possible to cut each container shape portion Y from the sheet material X without any trouble. can. In this way, by reducing the mutual spacing between the container-shaped parts Y, the container forming apparatus 2 that forms these into the sheet material X can be made compact, and a large number of container-shaped parts can be formed. Y can be formed into sheet material X.

Although the container P manufactured as described above does not have the flange Q, the flange Q can be formed on the container P by processing the container P as described below with reference to FIG.

FIG. 4 is an explanatory diagram for explaining the processing method.

That is, when forming the flange Q on the container P shown in FIG. 3(d), first, as shown in FIG. The outer circumferential surface of the open end of the container P is locked to the convex portion 7a provided on the inner circumferential surface of the receiver dia, and then the open end of the container P is pressed toward the convex portion 7a by the pressure punch 8 of the die device 6. As a result, the open end portion is bent toward the convex portion 7a, and the container P
The flange Q is formed at the open end of the flange Q.

1 2 Moreover, even if the container P shown in FIG. 3(d) is not processed as described above, as will be explained next in accordance with FIGS. 5(a) to (C), It is also possible to directly manufacture the container P with the flange Q by a method similar to that described under d).

FIGS. 5(a) to 5(C) are explanatory diagrams for explaining the manufacturing method.

In this method, each container shape portion Y formed on the sheet material
As shown in FIG. 5(a), two stepped portions Y + and Y z are formed at the opening end, and each container-shaped portion Y is cut together with the stepped portion Y3 by a die cutter 4 similar to that described above. It is separated from the sheet material X.

More specifically, the receiving die 4C of the die cutter 4 is pressed against the step Y on the open end side, and the cylindrical blade 4a is inserted into the container-shaped portion Y including the step Y3 and toward the receiving die 4C toward the step. Y,
As a result, the periphery of the stepped portion Y3 is cut at the stepped portion Y1, and the container-shaped portion Y is separated from the sheet material X together with the stepped portion Y3 to form a container-shaped member Y″.At this time, the stepped portion Y A part of , remains on the upper surface of the stepped portion Y3.

Next, the side wall Y2 of this container-shaped member Y' is cut in the trim device 5 by the rotary support stand 5a, the rotary cutter 5b, and the rotary receiving die 5c, as shown in FIG. 5(b). That is, the container-shaped member Y'' is held by suction on the rotary support stand 5a, and the rotary receiving die 5c
is pressed against the inner circumferential surface of the side wall Y2 at the top surface of the stepped portion Y3, and in this state, the rotary cutter 5b cuts the container-shaped member Y°
is moved from the side toward the rotary receiving die 5c, and the stepped portion Y
3, the side wall Y2 of the container-shaped member Y" is pressed against the outer circumferential surface of the side wall Y2 in a direction perpendicular thereto toward the rotary receiver die 5c, and thereby the side wall Y2 of the container-shaped member Y" is circumferentially formed at the top surface of the stepped portion Y3. The stepped portion Y, which was cut and remained on the upper surface of the stepped portion Y3, is completely separated from the container-shaped member Y" including the stepped portion Y3, and the stepped portion Y3 is completely separated from the container-shaped member Y'' including the stepped portion Y3, as shown in FIG. 5(C). becomes the flange Q, and a container P having the flange Q is obtained.

The formation of the flange Q by this method is performed regardless of the shape of the stepped portion Y remaining on the upper surface of the stepped portion Y3 of the container-shaped member Y" cut off from the sheet material X, and therefore, as shown in FIG. As described above in (a) to (d), there is no problem even if the container-shaped portions Y are formed on the sheet material X with a small interval between them.

Next, as an example of the second aspect of the present invention, the flange Q
FIG. 6(a) shows a method for manufacturing a container P that does not have a container P.

This will be explained according to (b).

FIGS. 6(a) and 6(b) are explanatory diagrams for explaining this manufacturing method.

In the embodiment of the first aspect, this manufacturing method includes:
By cutting each container shape portion Y from the sheet material X using the cutting device 3, a container P can be obtained directly;
This eliminates the need for the trim device 5.

That is, as shown in FIG. 6(a), the cutting device 3 includes a holder 9 that holds the bottom of each container-shaped portion Y formed in a line in the width direction of the sheet material X on the bottom side. , a rotary cutter 10 is provided on the opening side of each container-shaped portion Y in place of the die cutter 4, and each container-shaped portion Y on the same line supplied to the cutting device 3 is cut as shown in FIG. 6(a). The bottom part is held by the holder 9, and the rotary cutter 10 is inserted from the opening side and pressed against the inner circumferential surface of the upper part of the side wall Y2 in a direction perpendicular thereto. and,
The rotary cutter 10 rotates about its own axis and rolls along the inner circumferential surface of the side wall Y2, thereby cutting the upper part of the side wall Y2 in a circumferential shape as shown in FIG. 6(b). Thus, a container P is obtained.

At this time, the open end of the container-shaped portion Y remains on the sheet material X side, so even if the sheet material Of course, there is no problem even if the distance between the container-shaped parts y is small.

Therefore, similarly to the embodiment of the first aspect described above, the container forming apparatus 2 can be made compact, and a large number of container-shaped parts Y can be formed on the sheet material X.

In this embodiment, when cutting the side wall Y2 of the container-shaped member Y'' or the container-shaped part Y, the rotary cutters 5b and 1 are used.
0 was used, but it is of course possible to use a non-contact type cutter such as a laser cutter.

(Effects) As is clear from the above description, according to the first aspect of the present invention, the side wall of the container-shaped member separated from the sheet material by cutting the periphery of the container-shaped portion formed in the sheet material. By cutting the synthetic resin container in a direction substantially perpendicular to this, the container can be formed regardless of the shape of the surrounding portion of the container-shaped member cut off from the sheet material, and therefore, The container-shaped portions can be formed into a sheet material with small intervals from each other to produce a container of a desired shape without any trouble, and the device for forming the container-shaped portion into a sheet material and the device for separating it from the sheet material can be miniaturized. In addition, a large number of container-shaped portions can be formed on a sheet material to improve the yield.

Further, according to the second aspect of the present invention, by manufacturing a synthetic resin container by cutting the side wall of the container-shaped portion formed on a sheet material in a direction substantially perpendicular thereto, the container-shaped portion is The container can be formed into a desired shape regardless of the distortion of the surrounding sheet materials or their mutual spacing. Therefore, similarly to the above, the container shape can be formed into a large number of sheet materials at small intervals from each other. It is possible to improve the production yield, and it is also possible to downsize the apparatus for forming the container-shaped part into the sheet material and the apparatus for separating it from the sheet material.

[Brief explanation of drawings]

Figure 1 is a perspective view of an example of a synthetic resin container, and Figure 2 is a perspective view of an example of a container made of synthetic resin.
Schematic explanatory diagram of the method for manufacturing the illustrated container, FIGS. 3(a) to 3(a)
(d) is an explanatory diagram for explaining essential parts of an example of the first aspect of the present invention, FIG. 4 is an explanatory diagram for explaining the method for processing the container shown in FIG. 3(d), and Figures (a) to (C) are explanatory diagrams for explaining essential parts of other examples of the first aspect of the present invention, and Figures 6 (a) and (b) are illustrations of the second aspect of the present invention. FIG. 2 is an explanatory diagram for explaining main parts of an example. P...Synthetic resin container X...Sheet material 7 8 Y...Container shape portion Y. ... Container-shaped member 2 ... Side wall ■ FIG, 6 (G) 273 F I G, 6 (b)

Claims (1)

[Scope of Claims] 1. A belt-shaped sheet material that is continuously molded by heating and melting a thermoplastic synthetic resin and is fed in the longitudinal direction while being maintained at a moldable temperature, from one side in the width direction. Container-shaped parts are sequentially formed in the longitudinal direction of the sheet material by pressure-forming until they stretch into the shape of a plurality of containers in a row, and then the periphery of each container-shaped part is cut to separate it from the sheet material. A method for producing a synthetic resin container, comprising: forming a container-shaped member by cutting the side wall of the container-shaped member in a direction substantially perpendicular thereto to form a container having a predetermined shape. 2. Heat-molten thermoplastic synthetic resin is continuously molded, and a plurality of sheets are formed in a row in the width direction from one side of the belt-shaped sheet material that is fed longitudinally while being maintained at a moldable temperature. Container-shaped parts are press-formed until they are elongated into the shape of a container, and the container-shaped parts are successively formed in the longitudinal direction of the sheet material, and then the side walls of each container-shaped part are cut in a direction substantially perpendicular thereto to form the container-shaped parts. A method for manufacturing a synthetic resin container, which comprises forming the container into a predetermined shape.