JPS6260762A - Fold-up forming method for cylinder film and device thereof - Google Patents

Abstract

PURPOSE:To make the bellowslike fold-up forming of a cylinder film come to fruition with strict accuracy, by attaching a form-keeping ring to a portion that comes to a fold of the cylinder film, while decompressing the inside of the cylinder film, and folding it in piles on the circumference of a core cylinder. CONSTITUTION:This forming device consists of a cylinder film feeding mechanism part 10, a spare forming mechanism part 20 and a fold-up form holding mechanism part 40. The cylinder film feeding mechanism part 10 feeds the spare forming mechanism part 20 with a cylinder film 12 via two feed rolls 14 and 16. The spare forming mechanism part 20 is provided with such a cylinder air bag 24 that is inflated to almost the same diameter as a diameter of the cylinder film 12, having the air bag 24 inflated after covering the cylinder film 12 from the upside. And, a form-keeping ring 32 is clamped to the circumference of the cylinder film at a position of fold width (a). At the fold-up form holding mechanism part 40, exhaust of the air bag 24 is carried out and the cylinder film 12 is made to piled up on the circumference of a hollow core cylinder 42 as being folded up bellows form by decompressive action.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field to which the Invention Pertains] The present invention relates to a method and apparatus for folding a continuous cylindrical film integrally molded or fused into a cylindrical shape into a bellows shape.

[Prior art]

Conventionally, synthetic resin cylindrical films have been mainly used as packaging materials, so methods have been employed in which they are cut by providing welding lines and tear lines at predetermined intervals, or they are wound around a take-up roll.

Recently, a new application for this type of cylindrical film has been developed, in which a cylindrical film made of polyvinyl chloride, etc. A pipe coating method has been developed and put into use that prevents underground water from entering sewer pipes and wastewater from flowing out by coating them with an impermeable membrane. The cylindrical film used in this construction method has an outer diameter that can cover a sewer pipe of just over 1 m, and a length of about 100 m or more, which is shaped like a bellows into a single relatively short containment pipe. It is used by folding and storing. Therefore, this type of storage tube is detachably attached to the shielding machine as a spare, and is configured so that the cylindrical film can be drawn out continuously and smoothly as the shielding machine moves forward.

However, it is extremely troublesome to unfold a cylindrical film and then fold it continuously into a bellows shape. For this reason, it has been desired to develop a continuous automatic folding device for cylindrical films of this type.

[Purpose of the invention]

Therefore, an object of the present invention is to provide a method and apparatus for folding a cylindrical film, which can continuously and reliably fold a continuously formed cylindrical film onto a cylindrical core tube using a simple mechanism and at low cost. It is in.

[Key points of the invention]

The method for folding and forming a cylindrical film according to the present invention includes a cylindrical film feeding step in which a continuously formed cylindrical film is sequentially fed out to a required length, and a predetermined length of the sequentially fed cylindrical film is expanded and held from the inside. A preforming process in which a folded part is formed by fixing a shape-retaining ring at a predetermined distance on the outer periphery, and a cylindrical film with the shape-retaining ring fixed thereon is sequentially formed into a bellows shape along the outer periphery of a hollow core tube under internal reduced pressure conditions. It is characterized by comprising a folding and holding step of folding and holding in an overlapping manner.

In the above-mentioned folding molding method, during preforming, an air bag that can be expanded and contracted is provided, a cylindrical film is held on the outer periphery of the air bag, a shape retaining ring is attached, and these shape retaining rings are further attached with a removable adhesive tape. It is preferable to hold it fixedly.

In addition, when holding the folded form, a plurality of guide rods of the shape-retaining ring are arranged upright on the outer periphery of the hollow core cylinder at a predetermined distance apart.
The cylindrical film with the shape-retaining ring fixed thereon is sequentially guided through these guide rods and folded.Then, the shape-retaining ring fixed on the cylindrical film is removed together with the adhesive tape, and the outside of the folded cylindrical film is further removed. It is preferable to insert a pressing piece to hold the pressing member.

On the other hand, an apparatus for carrying out the method for folding and forming a cylindrical film includes a cylindrical film supply means for sequentially supplying and transporting a continuously formed cylindrical film by a feed roller, and a cylindrical film inside the supplied cylindrical film. A spare equipped with a cylindrical air bag that is expansion molded to the same diameter, a shape retaining ring attached to the outer peripheral surface of the cylindrical film at a predetermined distance from the outside of the air bag, and an adhesive tape for fixing the shape retaining ring. A folding forming holding means comprising a forming means, a hollow core tube that sequentially guides the cylindrical film to which the shape retaining ring is fixed under internal reduced pressure conditions, and a pressing piece that folds and presses the cylindrical film into a bellows shape with a predetermined inner diameter; It can be comprised of a means for removing the adhesive tape and the shape-retaining ring from the folded cylindrical film and taking it out while being held in the hollow core tube.

[Embodiments of the invention]

Next, the method for folding and forming a cylindrical film according to the present invention will be described in detail below in relation to the apparatus for implementing this method.

FIG. 1 shows a schematic configuration of an apparatus for carrying out the method of the present invention. That is, in FIG. 1, the forming apparatus of the present invention includes a cylindrical film supply mechanism section 10 that can continuously supply a cylindrical film, and a preforming mechanism that performs preforming for expanding and folding the supplied cylindrical film. It basically consists of a mechanism section 20 and a folding and holding mechanism section 40 that sequentially folds and holds a preformed cylindrical film into a bellows shape.

The cylindrical film supply mechanism section 10 has a cylindrical film 12 that has been flattened and folded in advance and installed in a predetermined position, and this cylindrical film 12 is appropriately conveyed to a feed roll 14.
．． 16, it is configured to be continuously or intermittently supplied to the next preforming mechanism section 20.

Next, the preforming mechanism section 20 is arranged in a vertical relationship with a folding forming holding mechanism section 40, which will be described later, and is positioned concentrically with a hollow vibe 22 provided at its center. That is, this preforming mechanism section 20 is similar to the folding forming holding mechanism section 40.
A cylindrical air bag 24 made of a flexible sheet material that is expansion-molded to have approximately the same diameter as the cylindrical film 12 is provided above the hollow vibe 22 on the outer periphery of the hollow vibe 22 . This air bag 24 is airtightly attached to the outer periphery of the hollow vibe 22,
On the other hand, the hollow pipe 22 has an air supply/exhaust hole 26 formed at a suitable position inside the air bag 24. Therefore, a pressure blower connection port 28 and a pressure reduction blower connection port 30 are provided at the lower end of the hollow vibe 22, respectively, and one of the blowers (not shown) can be connected by operating an on-off valve (not shown) as appropriate. By communicating with each other, the air bag 24 can be inflated or deflated as necessary. Therefore, the cylindrical film 12 is lowered to a desired position while being expanded so as to cover the air bag 24 configured in this manner from above.
Air is supplied into the air bag 24 to inflate it. At this time, a shape-retaining ring 32 configured as shown in FIG. 2 or 3 is fixed to the outer periphery of the cylindrical film 12 at a position corresponding to the fold according to the folding width a at a predetermined distance.

In addition, for fixing these shape-retaining rings 32, it is effective to attach an adhesive tape 34 of a predetermined width that is easy to peel off to the outer periphery thereof. In addition, the shape retaining ring 32 used in this embodiment, as shown in FIG. On the other hand, if the shape-retaining ring 32 is attached so as to surround the air bag 24, as shown in FIG. It can be easily attached to the Furthermore, when attaching the adhesive tape 34, as shown in FIG.
．． 36, and support rods 38 each having an adhesive tape wrapping 35 mounted between these guide rails are mounted so as to be movable, and a plurality of shape retaining rings 32 fixed to the outer periphery of the cylindrical film 12 are simultaneously attached. Can be glued and fixed in a short time. As an alternative, the adhesive tape wrapping body 35 side is fixed, and the cylindrical film 12 to which the shape-retaining ring 32 is fixed is
It may also be configured to pivot on the sides.

The folding forming shape maintaining mechanism section 40 is located below the preforming mechanism section 20, and has a configuration in which a hollow core tube 42 is disposed coaxially with the hollow pipe 22, and this is positioned on a base 44. . An outward flange 46 of a predetermined width is provided at the lower end of the hollow core tube 42, and the bellows-shaped folded portion of the cylindrical film 12 is superimposed on this flange 46.

Therefore, on the outer circumference of the core tube 42, as shown in FIG. 5, a guide rod 48 is appropriately installed to surround the shape retaining ring 32 fixed to the outer circumference of the cylindrical film 12 and guide it downward. Provide several. In this case, it is preferable that the guide rod 48 is arranged upright on the base 44, and an annular member 50 is provided at a suitable position so as not to expand outward, and each guide loft 48 is fixed to this annular member 50.

Furthermore, a support pipe 52 is provided at a suitable location on the outer periphery of the guide rod 48, as shown in FIG. In this case, the support pipes 52 are also arranged upright on the base 44, and press pieces 54 that extend to the folded portion of the cylindrical film 12 to form the folded portion are slidably fitted therein. moreover,
A supply/exhaust pipe 56 is provided that penetrates the base 44 and has one end opened inside the hollow core tube 42.
A pressure blower connection port 58 and a pressure reduction blower connection port 60 are provided at the other end of the air conditioner 6 . Therefore, this folding forming holding mechanism section 40
After the shape-retaining ring 32 is fixed to the folded portion of the cylindrical film 12 by the preforming mechanism section 20 located above, the air bag 24 is evacuated and the cylindrical film 12 is attached to the shape-retaining ring 3.
The preformed cylindrical film 12 is supplied while descending due to its own weight and the operation of the cylindrical film supply mechanism section 10. At this time, by communicating the vacuum blower connection port 60 and a vacuum blower (not shown) to reduce the pressure inside the hollow core cylinder 42, the cylindrical film 12 to which the shape retaining ring 32 is fixed is bellows due to the pressure reduction action. While being folded into a shape, it is overlapped on the outer periphery of the hollow core tube 42. Next, for the folded portion of the cylindrical film °12 stacked in this way,
By inserting the pressing piece 54 and pressing downward, it is possible to reliably hold the folded shape. Since the above operation is repeated, the inside of the hollow core cylinder 42 is brought into a pressurized state after being depressurized by communicating with the pressure blower connection port 58 and a pressure blower (not shown) again. The air bag 24 is also expanded and molded. In this way, by repeating the above operation multiple times, a cylindrical film 1 of a predetermined length is
2 can be reliably folded into a bellows shape.

As shown in FIG. 6, the cylindrical film formed and held by the folding forming holding mechanism 40 is fixed to the cylindrical film by the adhesive tape 34 and shape holding ring 32 fixed to the cylindrical film by the preforming mechanism 20.
, the connecting portion of the hollow pipe 22 is separated, and the hollow core tube 12 is moved together with the base 44. Then, the hollow core tube 12 to which the cylindrical film folded into a bellows shape is attached is removed from the base 44, and the hollow core tube 12 is removed from the base 44. As shown in FIG. 7, the cylindrical film 12 is set so as to be stored between an inner storage cylinder 64 and an outer storage cylinder 66, one end of which is closed with a lid plate 62, and one end of the cylindrical film 12 is pulled out from the open end. It is suitable if

〔Effect of the invention〕

As is clear from the above-mentioned embodiments, according to the present invention, a continuous cylindrical film is spread and held in a cylindrical shape, a shape-retaining ring is fixed to the fold area with a removable adhesive tape, and then the cylindrical film is By reducing the pressure on the inside of the film and sequentially folding it around the outer periphery of the core cylinder, bellows-like folding of the cylindrical film can be easily and accurately achieved.

Further, when folding and forming a cylindrical film according to the present invention, a means for continuously transporting the cylindrical film, a means for expanding and holding the cylindrical film into a cylindrical shape and fixing a shape retaining ring on the outer periphery of the cylindrical film, and a shape retaining ring are provided. This is achieved by providing means for folding and holding the fixed cylindrical film over the outer periphery of the core tube while keeping the fixed cylindrical film in a state of internal decompression, and each of these means can be provided independently with a simple mechanism.
Since they only need to be interlocked in operation, the control mechanism is simple, and bellows-like folding of this type of cylindrical film can be realized at low cost.

In carrying out the present invention, the vacuum conditions during inflation of the air bag and folding and holding on the outer periphery of the hollow core tube need to be appropriately adjusted depending on the diameter and thickness of the cylindrical film. In addition, the shape-retaining rings used when preforming for folding can be selected from a variety of configurations and materials, and the adhesive tapes used to secure them have strong adhesive strength. Moreover, it is desirable to use a material with good releasability.

Although the preferred embodiments of the present invention have been described above, it goes without saying that various design changes may be made without departing from the spirit of the present invention.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an embodiment of an apparatus for carrying out the method of folding and forming a cylindrical film according to the present invention, and FIGS. 2 and 3 show different shape-retaining rings used in the apparatus shown in FIG. 1. An explanatory diagram showing an embodiment, FIG. 4 is a schematic perspective view showing a simple means for pasting adhesive tape in the device shown in FIG. 1, and FIG. 5 is a guide used in the device shown in FIG. 1. FIG. 6 is a detailed explanatory view of the folding and forming holding mechanism of the apparatus shown in FIG. 1, and FIG. 7 is an explanatory view of the storage state of the folded cylindrical film. 10. Cylindrical film supply mechanism section 20. Preforming mechanism section 4010. Folding forming holding mechanism part 12), cylindrical film 14, 16. ,, feed roller 22),, hollow pipe 24. ,,air bag 26,
,, air supply/exhaust hole 28. ,,pressure blower connection port 30,
,,Reducing pressure blower connection port 32. ,, shape-retaining ring 33,,
, stop 34. , Adhesive tape 35 , Adhesive tape wrapping 36 , Circular guide rail 38. ,, support rod 42)
,,Hollow core tube 44. , Base 46, Flange 4B, Guide rod 50, Annular member 52. ,,support pipe 54,,,pressing piece
56. ,,supply/exhaust pipe 58,,,pressure blower connection port

Claims (4)

[Claims] (1) A cylindrical film supply process in which the continuously molded cylindrical film is sequentially fed out to the required length, and the sequentially supplied cylindrical film is expanded and held from the inside at a predetermined length, and the shape is maintained by spacing a predetermined distance on the outer periphery of the cylindrical film. A preforming process involves fixing the ring to form a folded part, and a folding process in which the cylindrical film with the shape-retaining ring fixed is sequentially folded into a bellows shape along the outer periphery of the hollow core tube under internal reduced pressure conditions and held in layers. A method for folding and forming a cylindrical film, characterized by comprising a tatami forming and holding step. (2) In the folding forming method according to claim 1, an air bag that can be expanded and contracted is provided during preforming,
A method for folding and forming a cylindrical film, which comprises holding a cylindrical film on the outer periphery of the air bag, attaching a shape-retaining ring, and further fixing and holding these shape-retaining rings with a removable adhesive tape. (3) In the folding forming method according to claim 1, when holding the folding forming, a plurality of guide rods of the shape-retaining ring are arranged upright on the outer periphery of the hollow core cylinder at predetermined intervals,
The cylindrical film with the shape-retaining ring fixed thereon is sequentially guided through these guide rods and folded.Then, the shape-retaining ring fixed on the cylindrical film is removed together with the adhesive tape, and the outside of the folded cylindrical film is further removed. A method for folding and forming a cylindrical film, which comprises inserting a pressing piece and holding it under pressure. (4) A cylindrical film supply means for sequentially supplying and transporting a continuously formed cylindrical film by a feed roller, and a cylindrical air bag that is expanded and molded to have approximately the same diameter as the cylindrical film inside the supplied cylindrical film. At the same time, a preforming means is provided, in which a shape retaining ring is attached to the outer peripheral surface of the cylindrical film at a predetermined distance from the outside of the air bag, and an adhesive tape is provided to fix the shape retaining ring, and a cylindrical film to which the shape retaining ring is fixed. A folding-forming holding means comprising a hollow core cylinder that is sequentially guided under internal reduced pressure conditions, and a pressing piece that folds and forms a bellows shape with a predetermined inner diameter and presses it, and an adhesive tape and a shape-retaining ring made from the folded cylindrical film. and a means for removing the film and taking it out while being held in a hollow core cylinder.