JPWO2021100025A5

JPWO2021100025A5 -

Info

Publication number: JPWO2021100025A5
Application number: JP2022529022A
Authority: JP
Publication date: 2023-11-30

Claims

Flat flexible hose for transporting fluids, in particular garden hoses for transporting water,
- at least one first inner layer (2) defining an axis (X);
- at least one second layer (3);
- at least one reinforcing textile layer (4) interposed between said at least one first layer (2) and at least one second layer (3);
Said at least one first layer (2) and said at least one second layer (3) and said at least one reinforcing textile layer (4) are arranged so that said flexible hose has a substantially flat shape. position and an operative position extending radially and assuming a substantially tubular shape, said hose cooperating with said inoperative position under the pressure of the conveyed fluid from the operative position to the operative position, and from the operative position to the non-operative position when the fluid pressure ceases;
said at least one first layer (2) and said at least one second layer (3) are respectively made of first and second thermoformable polymeric materials that are mutually compatible with each other;
Said at least one reinforcing textile layer (4) is made of rigid textile yarns having at least in part first and second respective predetermined slopes (α, β) opposite to each other with respect to said axis (X). configured,
Said at least one reinforcing textile layer (4) is a knitted layer having chain stitches (6) of tricot type with rows of stitches (8) and courses of stitches (7), said rows of stitches (8) and courses of stitches (7); A hose, at least one of the courses (7) of which comprises the chain stitch (6).

2. A hose according to claim 1, wherein both the row of stitches (8) and the course of stitches (7) are composed of the chain stitch (6) of the tricot type.

3. Hose according to claim 1 or 2, comprising a single reinforced textile layer (4) made up of the knit layer with the tricot type chain stitch (6).

4. A hose according to any one of claims 1, 2 or 3, wherein the hose is free of at least one reticulated and/or helical reinforcing textile layer.

The rigid textile threads of the at least one reinforcing textile layer (4) further maintain the radial extent of the hose in the operating position and substantially prevent expansion of the hose starting from the operating position. The hose according to any one of Items 1 to 4.

6. A hose according to any one of claims 1 to 5, wherein the first and second polymeric materials have elastic behavior in both the inactive and operative positions of the hose.

7. A hose according to any one of the preceding claims, wherein the length of the hose remains substantially unchanged both in the inactive position and in the operative position.

A method for manufacturing a flat flexible hose (1) according to any one of claims 1 to 7 , comprising the following steps: - at least one first inner side defining an axis (X); layer (2);
- at least one second outer layer (3);
- at least one reinforcing textile layer (4) interposed between said at least one first layer (2) and at least one second layer (3);
said at least one first layer (2) and said at least one second layer (3) are respectively made of first and second thermoformable polymeric materials that are mutually compatible with each other;
Said at least one reinforcing textile layer (4) are opposed to each other with respect to said axis (X) such that the length of said hose remains substantially unchanged both in said non-working position and in said working position. consisting of a rigid textile yarn at least partially having a first and second respective predetermined slope (α, β) of orientation;
Said at least one reinforcing textile layer (4) is a knitted layer having chain stitches (6) of tricot type with rows of stitches (8) and courses of stitches (7), said rows of stitches (8) and courses of stitches (7); providing a tubular semi-finished product (5), at least one of the courses (7) of said chain stitch (6); said tubular semi-finished product being heated to a first predetermined thermoforming temperature; Located in
- flattening the semi-finished product (5) to obtain the flat flexible hose (1);
- a first cooling step of said flat flexible hose (1).

said first thermoforming temperature is in the range 170° C. to 190° C., and after said providing step and before said crushing step, a second step for cooling said semi-finished product (5); is provided over a period of time ranging from 0.5 to 1.5 seconds to reach a second predetermined temperature ranging from 90° C. to 110° C. with respect to the outer surface of the semi-finished product (5). The method described in Section 8 ,

Said second step for cooling said semi-finished product (5) is preferably at a temperature of from 12°C to 20°C, more preferably from 15°C to 17°C, for a period equal to about 0.5 to 1.5 seconds. 10. The method according to claim 9 , carried out by immersion in a first tank (40) with water.