JP4432071B2 - Forming method of tube body container - Google Patents

Description

  The present invention relates to a tube body container forming method for forming a tube body container easily and inexpensively using a flexible tube.

  An inexpensive refill container body that contains the content liquid is detachably assembled to the outer container body that is excellent in design and mechanical strength, and a pump that dispenses the content liquid in the refill container body is dispensed. When a functional container is assembled to form a composite container, and the content liquid is used up, the refill container body is replaced with a new one, and the expensive outer container body is reused as it is. ing.

As the refill container body in this composite container, the upper annular portion and the lower bottom portion are integrally coupled to both ends of a cylindrical body portion formed by rolling a plastic laminate film by means of insert injection molding means. There is something.
JP 2001-278292 A

Also, as the same refill container body, a bottom plate member is fitted into the lower end opening of a cylindrical member formed by rolling a soft film, and is welded in an airtight manner, and a ring member is fitted into the upper end opening. There are some that are welded in an airtight manner.
JP 2002-104448 A

  However, in the prior art disclosed in Patent Document 1, since complicated molding operations such as molding from a film to a cylindrical body and insert injection molding are required, operations in each molding process are troublesome. There was a problem that there was a possibility that the equipment cost would be high because it was won and a dedicated insert injection molding apparatus was required.

Further, in the prior art disclosed in Patent Document 2, since the dense welding and fixing of the bottom plate member and the ring member to the cylindrical member made of a soft film is welding between the fitted peripheral surfaces, to such welding achieved, it is required and high dimensional accuracy and precise pressure control is that amount, molding becomes difficult and the bottom plate member and the ring member both a part of the interior of the flexible film made of tubular member It will be located, this may reduce the capacity of the molded soft film cylindrical member, or may interfere with the dispensing of the content liquid from the soft film cylindrical member, There was a problem.

  Therefore, the present invention was devised in order to solve the above-described problems in the prior art, and a compression-molding technique that allows easy operation of a cylindrical tube that is easily bent and deformed without requiring equipment costs. The tube body that can be easily used as a refill container by the pressure welding method between flat surfaces, which can easily obtain strong and reliable close welding, is a technical subject, and is easily bent and deformed. The object is to produce the container simply, inexpensively and stably.

Among the present invention for solving the above technical problems, the means of the invention described in claim 1 is:
Sealing the bottom opening of the cylindrical synthetic resin tube by welding a synthetic resin bottom plate to form a bottomed tube;
The upper end portion of the tube of the bottomed tube is curved and deformed outward by heating, and formed into a curled portion of an outer casing shape,
Next, a ring-shaped synthetic resin shoulder part that is externally fitted to the tube of the bottomed tube is welded and fixed to the curled portion at the welding end surface, which is a part of the upper end surface, and formed into a tube body container. ,
It is in.

In the first aspect of the invention, since the upper end portion of the tube is formed into the curled portion of the outer casing, the shoulder part and the upper end portion of the tube, that is, the curled portion, are press-welded between flat surfaces. This makes it possible to achieve a strong and dense weld easily and reliably.

  Also, the welding and fixing of shoulder parts to the bottomed tube is to form the upper end of the tube into a curled part and weld this outer curl-like curled part to the welding end face which is a part of the upper end face of the shoulder part. Therefore, the hook of the curled part with respect to the shoulder part becomes the assembly position of the bottomed tube and the shoulder part as it is.

  The invention according to claim 2 is the structure of the invention according to claim 1, wherein the bottom plate is punched out from the thin plate-like bottom plate material by a cutter provided at the lower end of the sleeve guide that is externally fitted to the tube, and by compression molding, Achieves welding to the tube at the same time as molding.

  In the second aspect of the invention, the molding of the bottom plate and the tight welding and fixing to the lower end opening of the tube can be achieved easily and stably by a series of processes of punching operation and compression molding operation. The

  According to a third aspect of the present invention, in the configuration of the first aspect of the present invention, a guide cylinder piece that is fitted into the tube substantially densely is erected on a flat base plate, and the guide cylinder piece and the base plate are By configuring the curled jig as a concave curved curl mold surface with the continuous corners, and pushing the upper end of the tube into the guide tube piece of this curl jig heated to the molding temperature. The upper end portion of the tube is heat-molded into a curled portion with a curl mold surface.

  In the invention according to the third aspect, the upper end portion of the tube is externally pressed into the guide tube piece of the curl forming jig heated to the molding temperature to form the curl portion. In the molding process, the bottom of the bottomed tube does not get in the way.

  The invention according to claim 4 is the configuration of the invention according to claim 1, wherein the upper end surface of the shoulder part is divided into an upper outer ring-shaped surface and a lower inner ring-shaped surface via a stepped portion. The inner ring-shaped surface is the welding end surface.

  In this invention of Claim 4, since the outer ring-shaped surface in the upper end surface of the shoulder parts is the upper end surface of the entire tube body container, the outer ring-shaped surface is formed between the tube and the shoulder parts. Without adversely affecting the welding and fixing, it can function suitably as an attachment location for other combination members.

  The invention according to claim 5 is obtained by adding the thickness of the tube to the range of 0.2 to 0.5 mm to the configuration of the invention according to claim 1.

  In the invention according to claim 5, the ease of bending deformation of the tube can be adjusted and set to a desired level while maintaining the strength of the tube body container, and the tube body adapted to the use conditions A container can be provided.

Since the present invention has the above-described configuration, the following effects can be obtained.
In the invention according to claim 1, it is possible to easily and surely and firmly achieve the close welding of the shoulder parts and the upper end portion of the tube, that is, the curled portion. It can be molded easily and well.

  In addition, since the hook of the curled portion with respect to the shoulder part becomes the assembling position of the bottomed tube and the shoulder part as it is, the assembling position of the bottomed tube and the shoulder part is easily and accurately achieved. As a result, the welding and assembling operation between the bottomed tube and the shoulder part is accurately and smoothly achieved.

  In the invention according to claim 2, since the sealing by the bottom plate of the lower end opening portion of the tube is easily and stably achieved by a series of processes of the punching operation and the compression molding operation, efficient molding is achieved. Workability can be obtained.

  In the invention of claim 3, the curled portion is formed by simply fitting and pushing the upper end portion of the tube against the guide tube piece of the curl forming jig, and the curled portion is formed by the molding process of the bottomed tube. Since the bottom part does not get in the way at all, the curl part can be formed without difficulty and smoothly.

  In the invention according to claim 4, the outer ring-shaped surface of the shoulder part can be suitably functioned as an attachment point of another combination member without adversely affecting the welding and fixing between the tube and the shoulder part. Therefore, it is easy to achieve suitably without compromising the combination with other members of the tube body container.

  In the invention of claim 5, the ease of bending deformation of the tube can be set to a value suitable for the use conditions while maintaining the strength of the tube body container. An easy tube body container can be provided.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
1 to 5 show one embodiment of the present invention in order, FIG. 1 shows a bottom plate punching process, FIG. 2 shows a curl forming process, and FIGS. 3 and 4 show shoulder part welding. FIG. 5 shows an example of the completed tube body container 1.

  In the punching process of the bottom plate 3 shown in FIG. 1, the lower end edge of the tube 2 having a simple cylindrical synthetic resin wall thickness of 0.2 to 0.5 mm is the cutter 11. The sleeve guide 10 is fitted with an outer fitting assembly with almost no gap.

  When a thin plate-like bottom plate material 12 made of synthetic resin is supplied directly below the tube 2 with the sleeve guide 10 assembled at the lower end (the state shown in FIG. 1), a combination of the tube 2 and the sleeve guide 10 is obtained. Accordingly, the portion of the sleeve guide 10 where the cutter 11 is formed on the bottom plate 3 is cut off from the bottom plate material 12 and positioned in the lower end portion of the tube 2.

  Subsequent to the bottom plate punching step shown in FIG. 1, the bottom plate 3 is compression-molded using a pair of molds, and simultaneously with the formation of the bottom plate 3, the bottom end opening of the tube 2 is closed to achieve the bottomed tube. 4 is molded, it is possible to perform compression molding of the bottom plate 3 simultaneously with punching of the bottom plate.

  In the curl forming step shown in FIG. 2, a short cylindrical guide cylinder piece 15 whose outer peripheral surface is slightly reduced in diameter is provided on a flat base board 14, and the guide cylinder piece 15 and the base plate 14 are erected. The curled portion forming jig 13 is formed by chamfering the continuous corner portion with the concave curled mold surface 16 and forming the curled portion forming jig 16 at an appropriate heat forming temperature. Keep on heating.

  The heating molding temperature of the curl forming jig 13 is set according to the molding resin material and the thickness of the tube 2, but is generally set to a value within the range of 70 to 200 ° C. For example, when the tube 2 is made of polyethylene and has a thickness of about 0.33 mm, the molding heating temperature is appropriately about 75 ° C.

  From this state, as shown in FIG. 2, the upper end opening of the tube 2 of the bottomed tube 4 is externally pushed into the guide cylinder piece 15 of the curl forming jig 13, and the upper end of the tube 2 is The curl forming die surface 16 is pressed and heated, and the upper end portion of the tube 2 is formed into the curled portion 5 along the concave curved surface of the curl forming die surface 16.

  In addition, the outer peripheral surface of the guide cylinder piece 15 of the curl forming jig 13 is a taper surface having a slightly reduced diameter upward, so that the upper end portion of the tube 2 is externally assembled to the guide cylinder piece 15. This is to make it easier.

  FIG. 3 shows an assembling process of the bottomed tube 4 formed with the curled portion 5 and the shoulder part 6 for performing the shoulder part welding and fixing process. The short part having an inner diameter substantially equal to the outer diameter of the tube 3 is shown in FIG. A shoulder part configured as a welded end surface 8 in which an outer collar-shaped collar ring 9 is integrally provided at the upper end portion of the cylindrical main body cylinder piece 7 and the inner half of the upper end surface is positioned below through a stepped portion. 6, the bottomed tube 4 is inserted and assembled from above until the curled portion 5 hits the welding end surface 8. That is, the bottomed tube 4 is inserted into the shoulder part 6 up to the assembly limit.

  In the shoulder part welding and fixing step shown in FIG. 4, the welding ring end surface 19 of the welding jig 18 that has been lowered while the shoulder part 6 is supported by the receiving jig 17 from below is used as the welding end surface of the shoulder part 6. The curled part 5 is pressed against the curled part 5 and is directly fixed to the welding end face 8 by welding.

  In the shoulder part welding and fixing step using the welding jig 18, the welding and fixing of the curled portion 5 to the welding end surface 8 may be performed by an appropriate means such as heat welding or high-frequency welding. In some cases, it is achieved at a heating temperature of 150 to 300 ° C. with an appropriate pressing force according to the heating time determined according to the molding speed.

  As a specific example, assuming that both the tube 2 and the shoulder part 6 are made of polyethylene, the welding ring end face 19 heated to 200 ° C. is pressed with a pressing force of 2.5 kg / cm for 2 seconds. Is appropriate.

  FIG. 5 shows an example of the structure of the molded tube body container 1. The upper and lower openings of the tube 2 having a simple cylindrical shape are fixed by the bottom plate 3 and the shoulder parts 6 so as not to be deformed. The most part of the tube 2 maintains a state where it can be easily bent and deformed.

  In addition, as described above, the upper and lower openings of the tube 2 that are easily bent and deformed are fixed by the bottom plate 3 and the shoulder part 6 so as not to be deformed. This makes it possible to prevent the handling state from being deteriorated.

  6 and 7 show an example in which the refill container 20 is configured using the tube body container 1 according to the present invention. This refill container 20 is combined with an outer container 23 to form a composite container. ing.

  The refill container 20 is configured by closely welding and fixing a joint part 21 to the shoulder part 6 of the tube body container 1 and closely fitting and fixing a pump 22 to the joint part 21.

  The joint part 21 hangs down a screw cylinder having a thread on the inner peripheral surface from the outer peripheral end of the bottom plate of the wide ring plate shape, and has a locking peripheral on the outer peripheral surface from the inner peripheral end of the upper surface of the top plate. The assembled cylinder is provided upright, and the lower surface of the top plate is closely welded to the outer ring-shaped surface located outside the welding end surface 8 of the shoulder part 6 and assembled to the tube body container 1. .

  The storage of the content liquid in the tube body container 1 is advantageous in that the joint parts 21 are welded and fixed to the tube body container 1 from the viewpoint of improving the safety of handling, and the joint parts 21 are supported for handling. Therefore, a good handling state can be obtained.

  If the joint part 21 is welded and fixed to the tube body container 1 and the content liquid is filled, the pump 22 is tightly locked and coupled to the assembly cylinder so that it cannot be detached while inserting the suction pipe into the assembly cylinder. The refill container 20 is completed.

  The refill container 20 is handled as a single product, and the consumer replaces the newly purchased refill container 20 with the bottomed cylindrical outer container 23 already in hand and the screw tube of the joint part 21. And are assembled into a composite container, and thereafter, the content liquid is poured out by the pump 22 and used.

  In addition, in the usage example shown in FIG. 6, FIG. 7, although the structure which assembled | attached the pump 22 with the detachable with respect to the combination of the tube body container 1 and the joint part 21 was shown, it is limited to this. However, the pump 22 may be detachable so that the pump 22 can be reused.

  Further, in this case, a sealing film is tightly welded to the shoulder part 6 or the joint part 21 to seal the combination of the tube body container 1 and the joint part 21, that is, the refill container 20, and when the pump 22 is assembled. It is also possible to achieve the opening of the refill container 20 by piercing and breaking the sealing film with the suction pipe of the pump 22.

  The tube body container 1 can be used as a normal tube container that can be self-supported by providing an opening and closing spout that can be opened and closed in the shoulder part 6. It is also possible to configure a refill container with the tube body container 1 alone by providing the portion.

It is explanatory drawing which shows the baseplate punching process of one Embodiment of this invention. It is explanatory drawing which shows the curl part formation process of one Embodiment of this invention. It is explanatory drawing which shows the assembly | attachment process of the bottomed tube and shoulder part of one Embodiment of this invention. It is explanatory drawing which shows the shoulder part welding fixation process of one Embodiment of this invention. It is explanatory drawing which shows the structural example of the tube body container shape | molded by one Embodiment of this invention. It is explanatory drawing which shows the example of application to the refill container of the tube body container shape | molded by this invention. It is a semi-longitudinal sectional view which shows the composite container of the application example shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1; Tube body container 2; Tube 3; Bottom plate 4; Bottomed tube 5; Curl part 6; Shoulder part 7; Main body cylinder piece 8; Welding end surface 9: Gutter ring 10; Sleeve guide 11; Curl forming jig 14; Base plate 15; Guide cylinder piece 16; Curl forming die surface 17; Receiving jig 18; Welding jig 19; Welding ring end face 20; Refill container 21; Joint part 22;

Claims (5)

  The bottom end opening of the cylindrical synthetic resin tube (2) is sealed by welding the synthetic resin bottom plate (3) to form the bottomed tube (4), and the bottomed tube (4) tube The upper end of (2) is curved and deformed outward by heating, is formed into an outer curl-shaped curled part (5), and then is a ring-shaped synthetic resin shoulder part that is externally fitted to the tube (2) ( 6. A method for forming a tube body container in which 6) is welded and fixed to the curled portion (5) by pressure welding molding at a welding end surface (8) which is a part of the upper end surface.   The bottom plate (3) is punched out of the thin plate-like bottom plate material (12) with a cutter (11) provided at the lower end of the sleeve guide (10) that fits around the tube (2), and is simultaneously formed by compression molding. The method for forming a tube body container according to claim 1, wherein welding to the tube (2) is achieved.   On the flat base plate (14), a guide cylinder piece (15) that is fitted into the tube (2) almost closely is erected, and the connecting angle between the guide cylinder piece (15) and the base plate (14) The curl forming jig (13) is configured as a concave curved curl mold surface (16), and the tube is attached to the guide cylinder piece (15) of the curl forming jig (13) heated to a molding temperature. The tube body container according to claim 1, wherein the upper end portion of the tube (2) is thermoformed into the curled portion (5) by the curl mold surface (16) by externally pressing and pushing the upper end portion of the (2). Molding method.   The upper end surface of the shoulder part (6) is divided into an upper outer ring-shaped surface and a lower inner ring-shaped surface through a step portion, and the inner ring-shaped surface is used as a welding end surface (8). The forming method of the tube body container as described.   The method of forming a tube body container according to claim 1, wherein the thickness of the tube (2) is set within a range of 0.2 to 0.5 mm.

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