CN104010804A - Laminated polyethylene braided fabric tube - Google Patents

Abstract

A multi-layer pipe 100 for transporting fluids comprising at least three concentric layers, the three concentric layers pipe comprising: an upper layer 102, a middle layer 104, and a lower layer 106. The upper layer 102 and the lower layer 106 are made of linear low density polyethylene and low density polyethylene, while the middle layer 104 is made of high density polyethylene. The middle layer is woven from fabric in a warp and weft pattern 108 which is then attached to the lower and upper layers laminated by a laminator.

Description

Laminated polyethylene braided fabric tube

technical field

The present invention relates to a multilayer pipe for transporting liquids, gases and the like, and more particularly to a multilayer pipe comprising structurally separate layers of polyethylene.

Background technique

It is generally accepted that tubes are used to transport various substances, such as liquids, gases or the like, around. Pipes traditionally made of steel or cast iron are being replaced by plastic pipes. These tubes are made from a single layer of film. As technology develops, tubes are made of various materials with better mechanical properties. Such tubes can be connected as required.

However, such tubes with a single-layer film structure cannot withstand the mechanical stress imposed by high-pressure water flow or air flow. Furthermore, such single-layer tubes are bulky and difficult to manipulate. Also, the presence of a single layer makes the tube vulnerable to damage from highly corrosive chemicals such as ozone and chlorinated derivatives. Additionally, monolayer films lack mechanical strength, reducing the overall efficiency of the tube.

Therefore, there is a need for a tube that overcomes the above-mentioned shortcomings and the shortcomings of the prior art.

Contents of the invention

The present invention relates to a multilayer pipe for transporting liquids, gases and the like, and more particularly to a multilayer pipe comprising structurally separate layers of polyethylene.

In one embodiment of the invention, the multilayer tube is provided with at least three concentric layers.

In one embodiment of the present invention, the three concentric layers of the multilayer tube include: an upper layer, a middle layer and a lower layer.

In one embodiment of the present invention, different grades of polyethylene are used for each layer (upper layer, middle layer and lower layer).

In one embodiment of the invention, the upper and lower layers are made of linear low density polyethylene (L.L.D.P.E) and low density polyethylene (L.D.P.E).

In one embodiment of the invention, the middle layer is made of high density polyethylene (H.D.P.E), wherein the middle layer is woven in a warp and weft pattern.

In another embodiment of the invention, the multilayer tube is provided with at least five concentric layers.

In one embodiment of the present invention, each layer (five layers) adopts different grades of polyethylene designed to be alternately arranged.

In one embodiment of the invention, the five-layer structure is an alternating application of linear low density polyethylene (L.L.D.P.E) and low density polyethylene (L.D.P.E) and high density polyethylene (H.D.P.E).

In one embodiment of the invention, the middle layer is woven from fabric (in warp and weft patterns) on a circular loom.

In one embodiment of the present invention, the lower layer and the upper layer are pasted on the middle layer via a glue machine.

In one embodiment of the invention, the various layers are encapsulated together by an encapsulation machine.

In one embodiment of the invention, the encapsulated layers are folded to form a tube.

In one embodiment of the invention, it is an object of the invention to provide high mechanical strength, lighter weight and high efficiency pipes for various applications.

Description of drawings

In conjunction with the accompanying drawings, the above-mentioned aspects and other features disclosed in the present invention are explained as follows, wherein:

Fig. 1 is a cross-sectional view of a multilayer pipe in one embodiment of the present invention.

Figure 2 is a front view of a three-layer tube in one embodiment of the present invention.

Figure 3 is a front view of a five-layer tube in one embodiment of the present invention.

Detailed ways

Embodiments of the present invention are described in detail with reference to the accompanying drawings. However, the present invention is not limited to these examples, which are merely for explaining the present invention more clearly to those skilled in the art. In the drawings, like reference numerals are used to designate like components.

Extruded pipes made of thermoplastic polymers are commonly found in various applications such as domestic water pipes in the construction industry, radiator pipes, geothermal pipes, shipbuilding and similar fields. Figure 1 is a cross-sectional view of a multilayer tube 100 according to one embodiment of the present invention. The term "multilayer tube" means a structure that defines a cavity through its interior for conveying fluids, including but not limited to liquids, gases, fine-grained solids, and the like. In a preferred embodiment of the invention, the structure of the wall of the multilayer tube 100 has at least three concentric layers. The shape of the tube 100 is not limited to any finite geometry unless specified for the passage through which it flows.

As shown in FIG. 1 , the multilayer pipe 100 of the present invention has at least three concentric layers. These layers further include an upper layer 102 , a middle layer 104 and a lower layer 106 . In a preferred embodiment of the invention, different grades of polyethylene materials are used for the layers (upper, middle and lower). In one embodiment of the invention, upper layer 102 and lower layer 106 are made of linear low density polyethylene (LLDPE) and low density polyethylene (LDPE). In one embodiment of the invention, the middle layer 104, woven in the warp and weft pattern 108, is made of high density polyethylene (HDPE). The density of the high-density polyethylene is defined as greater than or equal to 0.941 g/cm ³ . The presence of high density polyethylene in the middle layer 104 strengthens the multilayer tube 100 .

In one embodiment of the present invention, during the manufacture of the pipe 100, the high density polyethylene is produced into strips through an extruder. The tape is then woven into fabric. Weaving of the fabric is done on a circular loom (not shown). Circular looms can be equipped with electronic control systems to obtain high performance layers. Electronic control systems may include sensors, microcontrollers and the like. In one embodiment of the invention, lower layer 106 and upper layer 102 are laminated via a laminator (not shown). The laminated lower layer 106 and upper layer 102 are attached to the woven fabric middle layer 104 such that the upper layer 102 and lower layer 106 wrap the middle layer 104 (as shown in FIG. 2 ). In one embodiment of the invention, the layers are applied via a glue machine (not shown). The pasted layers are folded and packaged into various desired shapes by a packaging machine to form tubes. This design produces a tube 100 that is lightweight because the layers of the tube 100 are woven from fabric and different grades of polyethylene. The multilayer tube 100 of the present invention is easy to handle.

In another embodiment of the present invention, the multilayer pipe 100 includes five layers made of different grades of polyethylene, as shown in FIG. 3 . The five-layer structure is that linear low-density polyethylene (L.L.D.P.E), low-density polyethylene (L.D.P.E) and high-density polyethylene (H.D.P.E) are arranged alternately. In this embodiment of the invention, the second and fourth layers of the five-layer tube are woven in a warp and weft pattern. After the first, third and fifth layers are laminated by a laminator, they are then pasted together with the second and fourth layers woven in a warp and weft pattern to finally form the tube 100 . The existence of five layers in the multi-layer pipe 100 provides conditions for safer delivery of high-pressure water flow.

The multi-layer pipe 100 of the present invention is more advantageous in withstanding strong mechanical stress imposed by high-pressure water flow or air flow. Second, the presence of at least three layers in the tube 100 protects the tube 100 from strong corrosive chemicals, such as ozone and chlorinated derivatives. In addition, different additives can be added to the alternating layers to protect the layers from UV radiation. Further, the presence of the middle layer of fabric makes the tube 100 lighter and easier to handle. Moreover, compared with the single-layer structure in the prior art, the advantage of the multi-layer (3 or 5 layers) of the tube 100 is also reflected in the mechanical strength, which can improve the overall efficiency and service life of the tube 100 .

Although the present invention has been described in detail with reference to specific embodiments, this description is not intended to be construed in a limiting sense. Various modifications to the disclosed embodiments, as well as substitutions for the embodiments, will become apparent to those skilled in the art from the description of the invention. It is therefore believed that such modifications do not depart from the spirit or scope of the invention as defined.

Claims (as amended under Article 19 of the Treaty)

1. A multilayer pipe (100) for conveying fluids comprising:

at least three concentric layers, the concentric layers comprising: an upper layer (102), a middle layer (104) and a lower layer (106);

said upper layer (102) and said lower layer (106) are made of linear low density polyethylene and low density polyethylene;

The middle layer (104) is made of high-density polyethylene; wherein

The middle layer is woven on a circular loom from a warp and weft pattern (108);

The middle layer is then applied to the lower layer and the upper layer laminated by a laminator.

2. The multilayer pipe (100) according to claim 1, comprising five concentric layers.

3. The multilayer pipe (100) according to claim 2, wherein the fourth and fifth layers are made of high density polyethylene.

4. A method of manufacturing a multilayer tube (100) for conveying fluids:

Arranging at least three concentric layers, the concentric layers comprising an upper layer (102), a middle layer (104) and a lower layer (106), wherein;

said upper layer (102) and said lower layer (106) are made of linear low density polyethylene and low density polyethylene;

The middle layer (104) is made of high-density polyethylene;

Weaving the middle layer (104) with the fabric of the warp and weft pattern (108) on a circular loom;

laminating said lower layer (106) and said upper layer (102) with a laminator;

affixing the laminated lower layer and the upper layer to the middle layer

The layers are sealed with a sealing machine.

5. The method of manufacturing a multilayer tube (100) for conveying fluids according to claim 4, wherein said encapsulation is achieved by folding, welding with hot air and pressing into a tube.

6. The method of manufacturing a multilayer tube (100) for conveying fluids according to claim 5, wherein said folding, welding and pressing are realized as a single operation.

7. The method of manufacturing a multilayer pipe (100) for transporting fluids as claimed in claim 4, wherein the high density polyethylene is made into a tape by means of an extruder.

8. The method of manufacturing a multilayer pipe (100) for conveying fluids as claimed in claim 4, wherein said belt is arranged for weaving said fabric.

9. The method of manufacturing a multilayer tube (100) for conveying fluids as claimed in claim 4, wherein said weaving is controlled by an electronic control system

10. The method of manufacturing a multilayer tube (100) for conveying fluids according to claim 4, wherein said electronic control system comprises sensors and a microcontroller.

11. The method of manufacturing a multilayer pipe (100) for conveying fluids as claimed in claim 4, wherein each of said alternating layers is provided with a different additive to protect each of said layers from ultraviolet radiation.

Claims (10)

1. A multilayer pipe (100) for conveying fluids comprising: at least three concentric layers, the concentric layers comprising: an upper layer (102), a middle layer (104) and a lower layer (106); said upper layer (102) and said lower layer (106) are made of linear low density polyethylene and low density polyethylene; The middle layer (104) is made of high-density polyethylene; wherein The middle layer is woven from a warp and weft pattern (108) of fabric which is then applied to the lower layer and the upper layer laminated by a laminator. 2. The multilayer pipe (100) according to claim 1, wherein said weaving of the layers is performed on a circular loom. 3. The multilayer pipe (100) of claim 1, comprising five concentric layers. 4. A method of manufacturing a multilayer tube (100) for conveying fluids: Arranging at least three concentric layers, the concentric layers comprising an upper layer (102), a middle layer (104) and a lower layer (106), wherein; said upper layer (102) and said lower layer (106) are made of linear low density polyethylene and low density polyethylene; The middle layer (104) is made of high-density polyethylene; Weaving the middle layer (104) with the fabric of warp and weft pattern (108); laminating said lower layer (106) and said upper layer (102) with a laminator; affixing the laminated lower layer and the upper layer to the middle layer The layers are sealed with a sealing machine. 5. The method of manufacturing a multilayer pipe (100) for conveying fluids as claimed in claim 5, wherein the high density polyethylene is produced as a strip by an extruder. 6. The method of manufacturing a multilayer pipe (100) for conveying fluids as claimed in claim 5, wherein said belt is provided for weaving fabric. 7. The method of manufacturing a multilayer pipe (100) for conveying fluids according to claim 5, wherein said weaving of the layers is carried out on a circular loom. 8. The method of manufacturing a multilayer tube (100) for conveying fluids according to claim 5, wherein said weaving is controlled by an electronic control system. 9. The method of manufacturing a multilayer tube (100) for conveying fluids according to claim 8, wherein said electronic control system comprises sensors and a microcontroller. 10. The method of manufacturing a multilayer pipe (100) for conveying fluids as claimed in claim 5, wherein each of said alternating layers is provided with a different additive to protect each of said layers from ultraviolet radiation.