JPH0723532U - Flexible resin hose with a fluororesin sheet thermocompression bonded to the inner surface - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a flexible resin hose having a large diameter and a long length, which has good flexibility even though its inner surface is coated with a welding film of a fluororesin. [Constitution] On the inner surface of the outer layer 1 of the hose, a sheet of fluororesin material having a thickness of 0.01 mm to 0.3 mm is heated, and a fluororesin sheet welding film 5 is formed by uniformly pressure-bonding the inner surface with the inner surface of the fluororesin sheet. Coating.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention mainly relates to a flexible resin hose which is widely used as an air duct for a building or the like, a dust collector, a machine tool, a factory air supply / exhaust pipe, and an air duct for powder transportation.

[0002]

[Prior art]

 Conventionally, such a flexible resin hose whose inner surface is coated has a cylindrical shape made of a fluororesin such as PTFE resin (tetrafluoroethylene resin) or FEP (tetrahexafluoroethylene resin). It is known that the adhesive is bonded to the inner surface of the hose with an adhesive.

[0003]

[Problems to be solved by the device]

 Since the conventional flexible resin hose has a cylindrical inner surface, it must use a thick one (for example, 0.5 mm to 2 mm), so it is hard and has poor bendability. It was impossible to manufacture a long product having a diameter of up to 50 mm and a length of 4 to 5 m. The present invention has been made in view of the above problems of the prior art, and its purpose is to provide a fluororesin having excellent characteristics such as chemical resistance on the inner surface. Despite the above, the present invention intends to provide a long product having good flexibility, a large diameter of 300 mm to 500 mm and a length of 4 m to 5 m.

[0004]

[Action]

 A flexible hose whose inner surface is pressure-welded with a fluororesin sheet has good flexibility and bends well, and has a large diameter that allows a large amount of fluid to flow at one time.

[0005]

【Example】

Examples will be described with reference to the drawings. 1 to 3, the hose outer layer 1 is a hose outer layer forming sheet 4 formed of, for example, a band-shaped sheet of neoprene cloth material at the bent portions 3 and 3 at both ends of a spiral band core 2 formed by spirally forming a band-shaped steel material. The end portion of the coil is attached to the outer surface of the spiral ribbon core 2 in parallel with the spiral ribbon core 2 to form a tubular shape. The fluororesin sheet welding film 5 is formed by thermocompression bonding a thin fluororesin sheet to the inner peripheral surface of the outer hose layer 1. More specifically, for example, an adhesive is applied to the surface of a thin sheet of fluororesin such as PTFE, FEP, PFA or the like having a thickness of 0.01 mm to 0.3 mm, and the hose outer layer 1 is fitted onto the inner peripheral surface thereof, 24 hours allowed to 80 ° C. from the outside to increase the adhesive strength by dissipating solvent adhesive by closing one end of the hose outer layer 1 after recovery from the compressor to the pressure 3kg / cm ² ~5kg / cm ² feeding the compressed air When a thin sheet of fluororesin was thermocompression-bonded to the inner peripheral surface of the hose outer layer 1 by applying heat of about -100 ° C, favorable results were obtained because welding was possible with a uniform pressing force by air pressure.

[0006]

[Effect of device]

 INDUSTRIAL APPLICABILITY Since the present invention is constructed as described above, it has good flexibility even though a fluorine resin coating film having excellent chemical resistance is formed on the inner surface, and has a diameter of about 300 mm or more. A large diameter flexible resin hose with a large diameter of 500 mm and a length of 4 mm to 5 mm can be easily manufactured.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view of a flexible resin hose whose inner surface is heat-pressed with a fluororesin sheet.

FIG. 2 is an enlarged view of a part of a flexible resin hose whose inner surface is heat-pressed with a fluororesin sheet and which is partially cut away.

FIG. 3 is a side view of a flexible resin hose in which a fluororesin sheet is thermocompression bonded to the inner surface.

[Explanation of symbols]

 1 Hose Outer Layer 2 Spiral Band Core 3 Bent Section 4 Hose Outer Layer Forming Sheet 5 Fluororesin Sheet Welding Film

Claims (1)

[Scope of utility model registration request] 1. A fluororesin material sheet having a thickness of 0.01 mm to 0.3 mm is heated on the inner surface of the hose outer layer 1 and uniformly pressed to the inner peripheral surface by air pressure to form a fluororesin sheet welding film 5. A flexible resin hose with a fluororesin sheet heat-pressed on the coated inner surface.