JP2741501B2 - Method of manufacturing resin container - 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 resin container used for manufacturing containers such as a pencil case, a pouch, a bag, and a wallet.

[0002]

2. Description of the Related Art Conventionally, as a method of manufacturing a resin case as described above, for example, as shown in FIGS. 10, 11 and 12, a band-like member 13 is provided on one side edge of a resin sheet 12a. After the (pi-pin) is welded by the plate-shaped welded body 16 and bent into a cylindrical shape, both ends of the resin sheet 12a on the overlapping side are welded by the plate-shaped welded body 17 and unnecessary portions are cut off to form the cylindrical member 12. . As shown in FIGS. 13, 14 and 15, the closing member 14 is superimposed on the outer peripheral portion of the band-shaped member 13 welded to one end of the cylindrical member 12, and
The overlapping portions 3 and 14 are welded by the cylindrical heating element 8 and unnecessary portions are cut off. After the band member 13 and the closing member 14 are welded to the other end side of the cylindrical member 12 in the same manner as described above, the resin case formed as described above as shown in FIGS. 11 is turned over, and each of the belt-shaped members 13, 1
There is a first prior art manufacturing method in which the core members 15, 15 are press-fitted and connected to both ends on the connection side of No. 3 respectively.

As another manufacturing method, as shown in FIGS. 2 and 5, a cylindrical heating element 18 is fitted on the outer peripheral surface of a cylindrical member 22 formed by bending a resin sheet 22a into a cylindrical shape. After covering the folded edge portion 22c formed on one end side of the tube 22 with the tubular heating body 18, FIGS.
As shown in the figure, a band-shaped member 23 (pi-pin) is set on the folded edge portion 22c of the tubular member 22 so as to cover the folded edge portion 22c.
The closing member 2 is provided on the outer peripheral edge of the belt-shaped member 23 covered with 2c.
4 is superposed, the superposed portion of each member 22, 23, 24 is welded by the cylindrical heating element 18 and unnecessary portions are cut off. Hereinafter, similarly to the first conventional example, the resin case 21 formed as described above is turned upside down, and both ends of the band-shaped members 23, 23 are connected by the core members 15, 15, respectively. There is.

[0004]

However, in the manufacturing method of the first conventional example, the operation of welding the band-shaped member 13 and the operation of welding the closing member 14 are performed separately, so that the number of steps in the entire manufacturing is large. It takes time and effort to manufacture the entire product. In addition, since the work of connecting both ends of the band-shaped member 13 with the core member 15 and the work of finely adjusting the both ends of the band-shaped member 13 to be in contact with each other are performed manually, the connection work is troublesome and time-consuming. In addition to the cost, the number of parts and the number of assembling of the whole product increase, so that there is a problem that the manufacturing cost is high and it is difficult to manufacture at low cost.

[0005] In the manufacturing method of the second conventional example, after the band-shaped member 23 is set on the folded edge 22c of the cylindrical member 22, the band-shaped member 23 is covered.
Since the members 22, 23, 24 are superimposed and welded together, the contact portions of the members 22, 23 are slippery,
Since the band-like member 23 attempts to restore the initial shape due to the elasticity of the member itself, the covering position of the band-like member 23 may be displaced or fall off. It is difficult to set the member 23 in a proper position and in a proper coating state, and it takes time and effort to perform the coating operation. Further, similarly to the first conventional example, the belt-shaped member 13
Since both ends are connected by the core member 15, the number of parts and the number of assembling of the whole product increase, and there is a problem that it is difficult to manufacture at low cost.

SUMMARY OF THE INVENTION In view of the above problems, the present invention collectively welds an annular member and a closing member to respective folded edges formed at both ends of a cylindrical member in a state where the annular member and the closing member are superimposed respectively, thereby reducing the number of steps of the entire manufacturing and the number of steps. It is an object of the present invention to provide a method for manufacturing a resin container, in which the number of parts is reduced, the manufacturing cost can be reduced, and the manufacturing accuracy can be improved.

[0007]

According to the first aspect of the present invention,
After curving the resin sheet formed of the soft resin and polymerizing both ends, the polymerized portion of the resin sheet is integrally welded by welding and cutting means, and unnecessary portions of the resin sheet excluding the welded portion are cut off. An annular member formed at a size corresponding to the folded edge of the tubular member, at a folded edge formed by folding one end of the tubular member outward, A closing member formed to a size such that one side end of the shaped member is closed is superimposed, the superposed portion of each of the above members is integrally welded by welding cutting means, and each of the members except for the welded portion is welded. Unnecessary portions are cut off, the annular member and the closing member are superimposed on a folded edge formed by folding the other end of the cylindrical member outward, and are welded and cut by the welding cutting means. A tree manufactured by turning over a container body that is made by welding members Characterized in that it is a manufacturing method of manufacturing the container.

According to a second aspect of the present invention, each of the folded edges is formed by folding both ends of a cylindrical member having a cylindrical shape formed of a soft resin outward, and each of the folded edges has an annular member and a closing member. And the resin is welded integrally by welding cutting means, and unnecessary portions of each member excluding the welded portion are cut off, and then the container body formed by welding each member is turned upside down to produce a resin. It is a method of manufacturing a container.

[0009]

In the method for manufacturing a resin container according to the first aspect, the annular member and the closing member are superimposed on the folded edge formed at one end of the tubular member, and the superposed portion of each member is integrated by welding and cutting means. After welding and cutting off unnecessary portions, the annular member and the closing member are superimposed on the folded edge formed by folding back on the other end side of the cylindrical member, and the members are welded and cut off by welding cutting means. By manufacturing the welded container body upside down, the manufacturing cost can be reduced and the manufacturing accuracy can be improved.

The method for producing a resin container according to claim 2 is
Both ends of the cylindrical member having a cylindrical shape were turned outward to form each folded edge, and the annular member and the closing member were superimposed on each folded edge, respectively, and welded and unnecessary portions were cut off by welding cutting means. Thereafter, the container body formed by welding each member is turned upside down and manufactured, so that an operation and a step of forming a cylindrical member from a resin sheet can be omitted.

[0011]

According to the present invention, the annular member and the closing member are collectively welded to the folded edges formed at both ends of the cylindrical member while the respective annular members and the closing members are superimposed, as in the first conventional example. By welding the band-shaped member and the closing member separately to each other, the labor and work of connecting both ends of the band-shaped member with the core member can be omitted, and by using the cylindrical member formed in a cylindrical shape, the resin sheet can be used. Operations and steps for forming the tubular member can be omitted, the number of steps in the entire manufacturing can be reduced, and the manufacturing steps can be simplified. In addition, the number of parts and the number of assemblies of the entire product are smaller than those of the first and second conventional examples, the manufacturing cost required for one product can be reduced, and the manufacturing time can be greatly reduced. It can be manufactured at low cost. In addition, since the ring-shaped annular member is welded in a state of being overlapped between the opposing surfaces of the tubular member and the closing member, displacement of the overlapped position of the annular member during welding can be reliably prevented. In addition, the operation of welding the annular member can be performed properly and accurately, and the operation of manufacturing the resin container into a predetermined form can be easily performed, thereby improving the manufacturing accuracy of the product.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the drawings. The drawings show a method of manufacturing a resin case having a pencil case type as an example of a resin container. In FIG. 1, the resin case 1 has a cylindrical member 2 formed in a cylindrical shape.
Each of the annular members 3 and 3 and each of the closing members 4 and 4 are integrally welded to both ends of the cylindrical member 2, and a slide fastener 5 is attached to one side surface of the cylindrical member 2 so as to be freely opened and closed. The handle member 6 is integrally attached to one end side of the body. Further, the members 2, 3, 4, 5, and 6 are formed of a transparent or translucent resin or opaque resin having flexibility and heat melting property, such as vinyl chloride and nylon. , 5, 6 are colored in a single color or a composite color such as red, blue, green, or the like, or a design such as a character, a pattern, or a pattern is printed.

When manufacturing the resin case 1 described above,
As shown in FIGS. 2, 3, and 4, a rectangular or square resin sheet 2a formed of a transparent soft resin is curved into a cylindrical shape, and both ends of the resin sheet 2a on the curved side are overlapped with each other. For example, on one side of the overlapping portion 2b of the resin sheet 2a,
The lower end of the plate-like heating element 7 constituting the high-frequency heating device (not shown) is pressed at the lower end on the longitudinal side to form a heating surface 7a of an inner edge and an outer edge formed at the lower end of the plate-like heating element 7 on the longitudinal side. The welding and cutting of the resin sheet 2a are performed simultaneously with the cutting blade 7b.
That is, the heating surface 7a of the plate-shaped heating element 7 is pressed against one side surface of the overlapping portion 2b of the resin sheet 2a, and the entire length of the overlapping portion 2b of the resin sheet 2a is pressed by the heating surface 7a of the plate-shaped heating member 7. The welder is welded together as it is. At the same time, the cutting blade 7b of the plate-shaped heating element 7 is pressed along the welded portion, and unnecessary portions of the resin sheet 2a protruding outside the lower end of the plate-shaped heating element 7 outside the longitudinal side are cut off. Cylindrical member 2
Is completed. Alternatively, a cylindrical tubular member 2
May be extruded by an extruder (not shown),
Operations and steps for curving the rectangular resin sheet 2a into a cylindrical shape and welding and cutting the overlapping portion 2b of the resin sheet 2a can be omitted.

Next, as shown in FIG. 5, a high-frequency heating device (not shown) having a slightly larger diameter on the outer peripheral surface of the cylindrical member 2 formed in a cylindrical shape than the outer peripheral surface of the cylindrical member 2 is used. Is fitted into the cylindrical tubular heating element 8, and the back side peripheral edge of the folded edge 2 c formed by folding the one end side peripheral edge of the tubular member 2 outward is attached to the one end side peripheral edge of the tubular heating element 8. Cover and keep the shape in a cylinder. Alternatively, for example, on the outer peripheral surface of the tubular member 2,
The cylindrical heating element 8 formed in an arbitrary shape such as an ellipse, a triangle, and a rectangle may be fitted and held.

Next, as shown in FIGS. 6, 7 and 8, the cylindrical member 2 is inserted into a square closing member 4 formed in a size and shape such that one end of the cylindrical member 2 is closed. Folded edge 2
After placing the ring-shaped (circular) annular member 3 formed in a size and shape corresponding to c, and superimposing the folded edge 2c of the tubular member 2 on the outer peripheral edge of the annular member 3 from above,
The entire circumference of the overlapping portion of each of the members 2, 3, and 4 is pressed and held by the lower peripheral edge of the cylindrical heating element 8, and the heating surface 8a of the inner peripheral edge formed on the lower peripheral edge of the cylindrical heating element 8. The welding and cutting of each of the members 2, 3, and 4 are performed simultaneously with the cutting blade 8b on the outer peripheral edge. Alternatively, the annular member 3 is attached to the folded edge 2c of the tubular member 2.
After the stacking and the closing member 4 are placed and polymerized, the entire circumference of the superposed portion of each of the members 2, 3, 4 is pressed from below by the lower peripheral edge of the tubular heating body 8 to perform welding and cutting. The folded edge 2 of the tubular member 2 held in shape by the tubular heater 8
Corresponding to c, for example, an annular member 3 formed in an arbitrary shape such as an ellipse, a triangle, or a square may be welded.

That is, the annular portion 3a formed on the inner peripheral portion of the annular member 3 is fitted to the inner periphery of the folded edge portion 2c of the tubular member 2, and the outer peripheral portion of the closing member 4 and the lower surface side of the annular member 3 The peripheral edge and the folded edge 2c of the cylindrical member 2 are
In the state of being pressed, the members 2, 3, and 4 are integrally welded and welded in a state where the entire circumference of the overlapped portion of each member 2, 3, 4 is pressed by the heating surface 8 a of the cylindrical heating body 8. At the same time, each member 2, which presses the cutting blade 8b of the cylindrical heating element 8 along the welded portion and protrudes outward from the lower peripheral edge of the cylindrical heating element 8,
Cut off unnecessary portions of 3, 4, and 6. Thereafter, the operation of closing one end of the cylindrical member 2 is completed by extracting the cylindrical member 2 from the cylindrical heating element 8.

In the same manner as described above, the annular member 3 and the closing member 4 are superimposed on the folded edge 2c formed by folding the peripheral edge on the other end side of the tubular member 2, and the outer peripheral edge of the annular member 3 is Work of closing the other end of the cylindrical member 2 by integrally welding the both ends of the handle member 6 to the peripheral edge of the cylindrical member 2 facing the folded edge 2c while the both ends are superposed. Is completed. In addition, a fastener 5 made of synthetic resin is integrally welded to a peripheral edge on the back surface side of the opening 2d formed on one side surface of the cylindrical member 2. As shown in FIGS. 1 and 9, by turning over the resin case 1 formed as described above, the manufacturing operation of the entire product is completed.

As described above, the folded edge portion 2 of the tubular member 2
Since the annular member 3 and the closing member 4 are integrally welded to each other in a state where the annular member 3 and the closing member 4 are superimposed on each other, the band-shaped member 13 and the closing member 14 may be separately welded as in the first conventional example, or the band-shaped member may be welded. The labor and work of connecting both ends of the thirteen with the core member 15 can be omitted, the number of steps of the entire manufacturing can be reduced, and the manufacturing process can be simplified. Moreover, the number of parts and the number of assemblies of the entire product are smaller than those of the first and second conventional examples, and the manufacturing cost required for one product can be reduced, and the manufacturing time can be significantly reduced.
The resin case 1 can be manufactured at low cost.

In addition, since the ring-shaped annular member 3 is welded while being superposed between the opposing surfaces of the tubular member 2 and the closing member 4, the overlapping position of the annular member 3 is displaced during welding. Can be reliably prevented, and the welding operation of the annular member 3 can be performed properly and accurately, so that the manufacturing accuracy of the product is improved. In addition, by fitting the tubular welded body 8 to the outer peripheral surface of the tubular member 2, the members 2, 3, and 4 can be integrally welded while keeping the shape in a predetermined form, and The operation of manufacturing the case 1 into a predetermined form can be easily performed.

In the correspondence between the configuration of the present invention and the above-described embodiment, the resin container of the present invention corresponds to the resin case 1 of the embodiment, and similarly, the container main body is formed of the cylindrical member 2.
And the welding cutting means comprises a plate-shaped heating element 7 and a heating surface 7.
a, a cutting blade 7b, a tubular heating body 8 and a heating surface 8a,
Although corresponding to the cutting blade 8b, the present invention is not limited to only the configuration of the above-described embodiment.

In the above-described embodiment, the square closing member 4 is welded to both ends of the cylindrical member 2 via the annular member 3. For example, a circular, elliptical, triangular, pentagonal, The closing member 4 formed in an arbitrary shape may be welded to both ends of the tubular member 2, and is not limited to the shape of the embodiment.

The members 2, 3, 4, and 6 constituting the resin case 1 are welded and welded. For example, the members 2 and 2 formed of other soft resin by ultrasonic welding means (not shown). 3,4,5,6 may be welded. By selecting a welding method corresponding to the material of each member 2,3,4,5,6, it is possible to use a soft resin and a welding means other than the embodiment. Case 1 can be manufactured.

Although the above-described manufacturing method describes a step of manufacturing the pencil-case-type resin case 1, it is also applicable to a manufacturing operation of manufacturing a resin container such as a pouch, a bag, and a wallet. The resin case 1 can be manufactured in a predetermined form by using the members 2, 3, 4 and the heating bodies 7, 8 of the size and shape corresponding to the product. It is not limited to only.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a resin case manufactured by a manufacturing method of the present invention.

FIG. 2 is a perspective view showing a method for welding and cutting a resin sheet.

FIG. 3 is a longitudinal side view showing a welding and cutting method of a resin sheet.

FIG. 4 is a longitudinal side view showing a welded and cut state of a resin sheet.

FIG. 5 is a perspective view showing a folded state of a tubular member and a fitted state of a tubular heating element.

FIG. 6 is a perspective view showing a welding and cutting method of each member.

FIG. 7 is a longitudinal sectional side view showing a welding and cutting method of each member.

FIG. 8 is a longitudinal sectional side view showing a welded and cut state of each member.

FIG. 9 is a perspective view showing a folded state of the resin case.

FIG. 10 is a perspective view showing a method of welding and cutting out each member by the manufacturing method of the first conventional example.

FIG. 11 is a perspective view showing a welding and cutting method of the resin sheet.

FIG. 12 is a side view showing a welded and cut state of the resin sheet.

FIG. 13 is a perspective view showing a method of welding and cutting out each member.

FIG. 14 is a longitudinal sectional side view showing a welding and cutting method of each member.

FIG. 15 is a longitudinal sectional side view showing a welded and cut state of each member.

FIG. 16 is a perspective view showing a folded state of the resin case.

FIG. 17 is a side view showing a method of connecting both ends of the belt-shaped member.

FIG. 18 is a side view showing a connected state of both ends of the belt-shaped member.

FIG. 19 is a perspective view showing a fitted state and a covered state of each member by the manufacturing method of the second conventional example.

FIG. 20 is a perspective view showing a welding and cutting method of each member.

FIG. 21 is a longitudinal sectional side view showing a welding and cutting method of each member.

FIG. 22 is a vertical sectional side view showing a welded and cut state of each member.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Resin case 2 ... Cylindrical member 2a ... Resin sheet 2b ... Overlapping part 2c ... Folding edge part 3 ... Annular member 3a ... Annular part 4 ... Closure member 5 ... Fastener 6 ... Handle member 7 ... Plate-shaped heating element 7a ... Heating surface 7b Cutting blade 8 Cylindrical heating element 8a Heating surface 8b Cutting blade

Claims (2)

(57) [Claims] 1. A resin container having an opening formed on one side surface of a container main body formed of a soft resin having flexibility in a hollow shape, wherein a resin sheet formed of the soft resin is curved so that both ends are formed. After polymerization, the polymerized portion of the resin sheet is integrally welded by welding cutting means, and an unnecessary portion of the resin sheet excluding the welded portion is cut off to form a cylindrical member,
An annular member formed in a size corresponding to the folded edge of the tubular member is closed at a folded edge formed by folding one end of the tubular member outward, and one end of the tubular member is closed. The closing member formed to the size as shown is superimposed, the superposed portion of each member is welded integrally by welding cutting means, and unnecessary portions of each member excluding the welded portion are cut off and the cylinder is cut off. After the annular member and the closing member are superimposed on the folded edge formed by folding the other end of the shaped member outward, the container body is formed by welding and cutting off the members by welding and cutting, and then welding the members. A method of manufacturing a resin container that is manufactured upside down. 2. Both ends of a cylindrical member having a cylindrical shape formed of a soft resin are folded outward to form each folded edge,
The annular member and the closing member are superimposed on each of the folded edges, respectively, and are integrally welded by welding cutting means, and unnecessary portions of the members except for the welded portions are cut off. A method for manufacturing a resin container, which is manufactured by turning over a container body formed as described above.