JP5188320B2 - Manufacturing method of airtight different diameter bag - Google Patents

Description

  The present invention relates to a method for producing an airtight different-diameter bag, particularly for tubular fabrics of different diameters whose diameter changes in the length direction so that both ends are small in diameter and the central part is large in diameter. In this method, an airtight tube is attached to the inner surface of the inner surface to provide a lining, thereby producing a bag of different diameters having airtightness.

  As a conventional flexible container, for example, as shown in JP-A-2005-22736, a container having a small-diameter input cylinder and a discharge cylinder at both ends of a cylindrical large-diameter main body is used. What manufactured the main body part and the small diameter cylinder part as a continuous integral cylindrical fabric is used.

  In addition, as a method of transporting a large amount of liquid or the like on the surface, the applicant previously sealed the liquid or the like in a bag, connected a large number of the bags in a bowl shape, and towed it by a tugboat or the like while floating on the water. And a patent application has already been filed as Japanese Patent Application No. 2007-205788.

  As the structure of these bags, what is sewn into a desired shape using an airtight material such as tarpaulin is used, but with such a thing, the strength of the stitched portion is insufficient and a large load is applied. When applied, there is a high possibility of tearing from the suture.

  Therefore, in recent years, as a structure of the different-diameter bag A used for these applications, as shown in FIG. 1, a large-diameter portion 2 is formed at the center portion, and a small-diameter tubular fabric is formed at both ends thereof. It is conceivable to keep the airtightness by continuously weaving 1 integrally and applying a lining 4 to the inner surface of the tubular fabric 1 having a different diameter.

  However, in this method, since the diameter of the tubular fabric 1 having a different diameter is changed between the large diameter portion 2 and the small diameter portion 3, the lining 4 is provided on the inner surface across the large diameter portion 2 and the small diameter portion 3. It is difficult to form.

  The simplest possible method is to insert a rubber or plastic tube whose diameter is slightly smaller than the inner diameter of the small-diameter portion 3, expand the tube by applying an internal pressure, and attach the tube to the inner surface of the different-diameter tubular fabric 1. Although it is a method, since the large diameter part 2 is significantly larger than the diameter of a tube, it is difficult to expand a tube until it follows the large diameter part 2. If the diameter of the tube is larger than the inner diameter of the small diameter portion 3, wrinkles occur in the lining 4 in the small diameter portion 3.

  It is not impossible to expand to the large-diameter portion 2 by using a tube having a large elongation such as rubber, but since the tube is pasted in a distorted state, adhesion is insufficient. And the inner lining 4 is inferior in durability and easily cracked, and the airtightness cannot be maintained over a long period of time.

It is also possible to produce a different diameter tube that is almost compatible with the inner surface shape of the different diameter tubular fabric 1 by laminating plastic tubes and films and stick this to the inner surface of the different diameter tubular fabric 1. However, the bonded portion of the different diameter tube becomes hard and the strength is inferior, and it is difficult to form an appropriate lining 4.
Japanese Patent Laid-Open No. 2005-22736

  This invention is made | formed in view of this situation, forms the suitable lining 4 in the inner surface of the different diameter cylindrical fabric 1, and manufactures the airtight different diameter bag which was rich in durability and was appropriately lining. It is intended.

  Thus, the first invention of the present application is a method for manufacturing a different-diameter bag having airtightness by applying a lining to the inner side of the different-diameter tubular woven fabric, which is substantially the same shape as the different-diameter bag to be manufactured and has a slightly smaller diameter. A heat-shrinkable tube is placed on the outer side of the airtight core body, the heat-shrinkable tube is heated and shrunk so as to be along the outer surface of the core body, the heat-shrinkable tube is cooled and the shape is fixed. The core body is removed, and the obtained different-diameter tube is inserted into the different-diameter tubular fabric, and the different-diameter tube is expanded by internal pressure and pressed against the inner surface of the different-diameter tubular fabric. It is characterized by adhering to a tubular woven fabric.

  Further, the second invention of the present application is a method for producing a different-diameter bag having a gas tightness by applying a lining to the inside of the different-diameter tubular woven fabric, which is almost the same shape as the different-diameter bag to be produced and has a small-diameter air-tightness. A heat-shrinkable tube is placed on the outer side of the heat-resistant core, the heat-shrinkable tube is heat-shrinked to be along the outer surface of the core, and the core covered with the heat-shrinkable tube is used as the different diameter cylindrical woven fabric. Inserting the inside, inflating the core by internal pressure, pressing the heat-shrinkable tube against the inner surface of the different-diameter tubular woven fabric, bonding the heat-shrinkable tube to the different-diameter cylindrical woven fabric, and then removing the core It is characterized by.

  In these present inventions, it is preferable that the different diameter tubular woven fabric has a diameter that changes in the length direction so that both end portions have a small diameter and a central portion has a large diameter.

  Moreover, it is preferable that the said core body in this invention is what gave the airtight process to the flexible cylindrical fabric. Moreover, an airtight process may be performed on a flexible fabric and then sewn into a predetermined shape.

  According to the present invention, since the heat-shrinkable tube is shrunk by heat and along the surface of the core body, a seamless different-diameter tube having a shape according to the surface shape of the core body is obtained. By inserting and inflating into the different-diameter tubular fabric 1, an appropriate lining 2 is applied to the inner surface of the different-diameter tubular fabric 1, and an airtight different-diameter bag can be obtained.

  The first invention of the present application will be described below with reference to the drawings. In FIG. 2, 5 is a core. The core 5 has a slightly smaller diameter than the different-diameter bag to be manufactured, and is almost the same shape as the different-diameter bag. That is, it has a shape in which a large-diameter portion 6 is provided at the center and small-diameter portions 7 are continuously formed at both ends thereof.

  The core body 5 is made of a flexible and airtight material. For example, an inner surface of a tubular woven fabric having a different diameter is preferably provided with an airtight lining. Further, a material such as airtight tarpaulin may be sewn into a predetermined shape.

  The terminal opening of the small-diameter portion 7 of the core body 5 is closed with a lid 8, pressure fluid is fed from one end of the core body 5 through the injection tube 9, and the core body 5 is inflated by internal pressure, The shrinkable tube 10 is covered, and the heat-shrinkable tube 10 is heated and contracted. As a result, the diameter of the heat-shrinkable tube 10 is reduced and along the outer surface of the core body 5 as shown in FIG.

  When the heat-shrinkable tube 10 is cooled in this state and the shrinkage due to heat is stopped, the heat-shrinkable tube 10 is fixed in a shape along the surface of the core body 5. When the internal pressure of the core body 5 is removed and contracted as shown in FIG. 4 and removed from the heat-shrinkable tube 10, a different-diameter tube 11 having substantially the same shape as the inner surface of the different-diameter bag A is obtained.

  Next, as shown in FIG. 5, this different diameter tube 11 is inserted into the different diameter tubular fabric 1, the open ends at both ends of the different diameter tube 11 are closed with lids 12, and different diameters are introduced via the injection tube 13. A pressure fluid is fed into the tube 11 and inflated to press-contact the inner surface of the different-diameter tubular fabric 1 as shown in FIG. 4 is formed to obtain a bag A having a different diameter.

  When the different diameter tube 11 is bonded to the inner surface of the different diameter tubular fabric 1, the heat shrinkable tube 10 is temporarily in a state in which the different diameter tube 11 is inflated by an internal pressure and pressed against the inner surface of the different diameter tubular fabric 1. By heating to a temperature equal to or higher than the contraction temperature and bonding, and then cooling to a temperature equal to or lower than the contraction temperature while maintaining the internal pressure, the strain of the lining 4 can be removed.

  The method described above is the method of claim 1, but in the method of claim 2, the heat-shrinkable tube 10 is placed along the surface of the core body 5 obtained in FIG. After fixing the shape of the tube 10, the core body 5 is inserted into the different-diameter cylindrical fabric 1 as it is without removing it, and is inflated by applying fluid pressure to the core body 5 as shown in FIG. The tube 11 is adhered to the inner surface of the different-diameter tubular fabric 1, and then the core body 5 is removed from the inside of the different-diameter tube 11 to obtain a different-diameter bag A shown in FIG.

  According to the present invention, the heat-shrinkable tube 10 is contracted by heat to form a different-diameter tube 11 that is substantially the same shape as the different-diameter tubular fabric 1, and the different-diameter tube 11 is used as the different-diameter tubular fabric. 1 to form the lining 4 so that the different-diameter tube 11 does not excessively expand along the inner surface of the different-diameter tubular fabric 1, and the lining 4 is ruptured or wrinkled by excessive expansion. It does not occur.

  Further, the different-diameter bag A obtained by the present invention is formed by lining a continuous different-diameter tube 11 without any joints on the seamless different-diameter tubular woven fabric 1, so that it is flexible and The strength is high, and a certain airtightness is maintained by the continuous lining 4.

  The different-diameter bag A obtained by the present invention is not limited to the flexible container and the water transport bag as described above, and can be widely used for various bags that require airtightness.

Different diameter bag manufactured by the present invention Center vertical section with heat shrinkable tube on core Central longitudinal cross-sectional view of the heat-shrinkable tube contracted along the core Center vertical section with core removed from different diameter tube Center vertical cross-sectional view of different diameter tube inserted through different diameter tubular fabric Central longitudinal cross-sectional view of a tube with a different diameter tube attached to the inner surface of a different diameter tubular fabric The center longitudinal cross-sectional view of the state which stuck the different diameter tube along the surface of the core in the method of Claim 2 on the inner surface of the different diameter cylindrical fabric 1

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Different diameter cylindrical fabric 2 Large diameter part 3 Small diameter part 4 Lining 5 Core body 10 Heat-shrinkable tube 11 Different diameter tube

Claims (5)

A method of manufacturing a different-diameter bag (A) having an airtightness by applying a lining (4) to the inner side of the different-diameter tubular woven fabric (1), which is substantially the same shape as the different-diameter bag (A) to be manufactured. Cover the outside of the small-diameter airtight core (5) with a heat-shrinkable tube (10), heat-shrink the heat-shrinkable tube (10), and fit the outer surface of the core (5). After cooling the heat-shrinkable tube (10) and fixing the shape, the core (5) is removed, and the obtained different-diameter tube (11) is inserted into the different-diameter tubular fabric (1). The different-diameter tube (11) is expanded by internal pressure, pressed against the inner surface of the different-diameter cylindrical fabric (1), and the different-diameter tube (11) is bonded to the different-diameter cylindrical fabric (1). Manufacturing method of airtight different diameter bag A method of manufacturing a different-diameter bag (A) having an airtightness by applying a lining (4) to the inner side of the different-diameter tubular woven fabric (1), which is substantially the same shape as the different-diameter bag (A) to be manufactured. Cover the outside of the small-diameter airtight core (5) with a heat-shrinkable tube (10), heat-shrink the heat-shrinkable tube (10), and fit the outer surface of the core (5). A core body (5) covered with a heat-shrinkable tube (10) is inserted into the tubular fabric (1) having a different diameter, and the core body (5) is expanded by an internal pressure so that the heat-shrinkable tube (10) is different. The core (5) is removed after pressing the inner surface of the tubular fabric (1) and bonding the heat-shrinkable tube (10) to the tubular fabric (1) with a different diameter. Manufacturing method for different diameter bags The said different diameter cylindrical textile fabric (1) is a thing which a diameter changes to a length direction so that both ends may be small diameter and a center part may be large diameter, The feature of Claim 1 or 2 characterized by the above-mentioned. Manufacturing method of airtight different diameter bag The method for producing an airtight different-diameter bag according to claim 1, 2 or 3, wherein the core (5) is obtained by subjecting a flexible tubular fabric to an airtight treatment. The airtight different diameter according to claim 1, 2 or 3, wherein the core (5) is formed by subjecting a flexible fabric to an airtight treatment and sewing it into a predetermined shape. Bag manufacturing method

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