WO2014089889A1

WO2014089889A1 - Seamless welded tube and manufacturing method therefor

Info

Publication number: WO2014089889A1
Application number: PCT/CN2012/087951
Authority: WO
Inventors: 陈文涛; 林茂青; 王腾; 何庆锋; 陆芝
Original assignee: 深圳市通产丽星股份有限公司
Priority date: 2012-12-11
Filing date: 2012-12-29
Publication date: 2014-06-19
Also published as: CN102963601A; CN102963601B

Abstract

A seamless welded tube and a manufacturing method therefor. The tube comprises a tube body (1). The tube body (1) comprises an inner film (11) and an outer film (12) that are stacked together. The inner film (11) and the outer film (12) are alternately compounded together and respectively form right-angle stepped ports at two ends in the circumferential direction of the tube body (1). The outer surface (111) of the inner film (11) at one of the ports is exposed outside of the outer film (12), while the inner surface (121) of the outer film (12) at the other port is exposed outside of the inner film (11). The inner surface (121) of the outer film (12) that is exposed is lap-welded onto the outer surface (111) of the inner film (11) that is exposed. Also, the two ends in the circumferential direction of the outer film (12) are welded together, while the two ends in the circumferential direction of the inner film (11) are welded together. The manufacturing method comprises: the steps of thin-film manufacturing, thin-film compounding, winding for tube formation, and welding. The inner film (11) and the outer film (12) are alternately compounded together during thin-film compounding. The manufacturing method for the multilayered seamless tube allows for reduced difficulty in a printing process. The tube is smooth and seamless at where same is welded. The tube is provided with an aesthetic overall appearance. In addition, the need for cropping to acquire the right-angle stepped ports is obviated, the manufacturing process flow is simple, and the manufacturing costs for the tube are reduced.

Description

Seamless welded hose and preparation method thereof

Technical field

The invention relates to the field of packaging technology, in particular to a seamless welded hose made of sheet material and a preparation method thereof.

Background technique

At present, hoses play an increasingly important role in the packaging of daily detergents, cosmetics, foods, pharmaceuticals and other products. In the manufacturing process of the packaging hose, the conventional molding method of the tube body is extrusion molding, and then the steps of shoulder filling, printing and the like are completed, and finally the packaging hose is obtained. In the extrusion molding, the pipe body is integrally formed without welding, so the pipe body formed by the method is smooth, beautiful and has no joints. However, since the tube body is printed as a curved surface, the scrap rate in the printing process is significantly higher than that in the flat printing product, resulting in an increase in the cost of manufacturing the hose.

In order to reduce the cost, the tube forming technology made by winding and welding the sheet was born, and gradually became the development direction of the industry. In this molding process, in order to ensure that the finished hose can meet the basic functional requirements of mechanical properties, barrier properties, sealing, etc., the hose body is often welded by lap welding, that is, welding. The two ports of the sheet at the rear weld seam partially overlap, so that the packaging hose body made by the forming method has obvious irregularities and seams, thereby affecting the appearance.

technical problem

The technical problem to be solved by the present invention is to provide a seamless welded hose which is flat and seamlessly welded so that the overall shape of the hose is more beautiful and a preparation method thereof.

Technical solution

In order to solve the above technical problems, the present invention provides a seamless welded hose, comprising a tubular body, the tubular body including an inner membrane and an outer membrane stacked together; the inner membrane and the outer membrane are misaligned together, The circumferential ends of the tube body respectively form a port having a right-angled step shape, wherein an outer surface of the inner membrane at one port exposes the outer membrane, and an inner surface of the outer membrane at the other port exposes the inner membrane. The outer exposed inner surface of the outer membrane is lap welded to the outer surface of the outer exposed inner membrane, and the circumferential ends of the outer membrane are welded together, and the circumferential ends of the inner membrane are welded together.

Further, the outer film and the inner film are both single-layer or multi-layer structures.

Further, the thickness of the outer film and the inner film are not more than 300 μm.

Further, one of the outer film and the inner film is printed with a character or a pattern.

The invention also provides a preparation method of a seamless welded hose, comprising the following steps:

Making a film comprising an inner film and an outer film;

a composite film, wherein the inner film and the outer film are misaligned to form a sheet, and the opposite ends of the sheet respectively form a port having a right-angled step shape, wherein the outer surface of the inner film at one port is exposed outside Membrane, while the inner surface of the outer membrane at the other port exposes the inner membrane;

Winding into a tube, the above-mentioned composite sheet is wound into a column shape, and the outer exposed inner surface of the outer film is overlapped on the outer surface of the outer exposed inner film, and two of the outer film are The opposite ends are butted together in parallel so that the opposite ends of the inner membrane are butted together in parallel;

Welding, the finished wound sheet is welded by a welding device such that the inner film and the outer film are integrally joined, and the ends thereof are seamlessly welded together.

Further, in the step of fabricating the film, the inner film and the outer film are obtained by blow molding or tape casting.

Further, between the step of fabricating the film and the composite film, the step of printing the film is further included.

Further, the outer film is printed in the form of a print or a print.

Further, in the step of the composite film, the positioning and recombination of the outer film and the inner film are controlled by a correcting device.

Further, the preparation method further comprises the following steps:

Cutting, filling, sealing and capping the finished welded pipe.

Beneficial effect

Compared with the prior art, the seamless welded hose and the preparation method thereof in the embodiments of the present invention have the following advantages:

(1) Since the printing operation has been completed before the pipe making, that is, the printing is performed on the flat film first, and then the printed film is composited and rolled into a hose, which is compared with the conventional hose manufacturing process. After the printing process on the tube surface, the difficulty in the printing process is greatly reduced, the printing method is more flexible, and the printing pattern is more colorful, the printing rejection rate is greatly reduced, and the hose manufacturing cost is also significantly reduced.

(2) The pipe body of the seamless welded hose is welded with two types of welding methods: lap joint and parallel butt joint, which avoids the defects that the weld is prone to cracks due to external force. Therefore, the hose thus obtained is obtained. The welding has strong fastness, resistance to extrusion and good barrier property, and the welding place is smooth and seamless, so that the overall shape of the hose is more beautiful.

(3) In the above embodiment, the inner tube and the outer film are dislocated and directly combined to obtain the tube sheet, and the right angle stepped port is not required to be cut, and the hose manufacturing process is simple. At the same time, it can avoid the scrap rate caused by improper cutting or poor control, and the hose manufacturing cost is low.

(4) Since the outer film can be printed or printed, it enriches the printing method of the hose made by the inner film and the outer film composite and welding, so that it can no longer be stuck on the surface, thereby widening Customer's choice of space.

DRAWINGS

1 is a schematic view showing a seamless welded hose composite film in a flat state according to an embodiment of the present invention.

2 is a schematic view of the composite film of FIG. 1 before being wound into a tube.

Figure 3 is a schematic view of the composite film of Figure 1 after soldering.

Embodiments of the invention

The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

1 , 2 and 3, which are preferred embodiments of the seamless welded hose of the present invention, the seamless welded hose includes a tubular body 1 including an inner membrane 11 stacked together and Outer membrane 12. The inner membrane 11 and the outer membrane 12 are dislocated in a misaligned manner, and a port having a right-angled step shape is formed at each of the circumferential ends of the tubular body 1, wherein the outer membrane 111 of the inner membrane 11 at one port exposes the outer membrane 12, and the other port The inner surface 121 of the outer film 12 is exposed to the inner film 11, and the inner surface 121 of the outer film 12 is overlapped and laminated on the outer surface 111 of the inner film 11 exposed, and the circumferential ends of the outer film 12 are welded together. The circumferential ends of the inner membrane 11 are welded together.

The outer film 12 and the inner film 11 are both single-layer or multi-layer structures, and their thicknesses are not more than 300 μm. In an embodiment of the present invention, the outer film 12 is a single layer structure, which is a plastic layer and can be made of a polyolefin resin. The polyolefin resin can be a polyethylene or a polypropylene resin or a copolymer thereof, and can be on the outer film 12. Print text or graphics. In an embodiment of the invention, the inner film 11 is of a multi-layer structure and may include an adhesive layer, a barrier layer, a plastic layer, and the like; the adhesive layer may be made of an adhesive resin; and the material of the barrier layer may include ethylene-ethylene. A packaging material having good barrier properties such as an alcohol copolymer, an aluminum foil, or an electroplated aluminum; the material of the plastic layer of the inner film 11 may be the same as the material of the plastic layer of the outer film 12, and the inner film 11 may also be printed with characters or patterns.

The above is the specific structure of the seamless welded hose in the embodiment of the present invention, and the preparation method thereof will be briefly described below.

The method for preparing a seamless welded hose according to an embodiment of the invention comprises the following steps:

Making a film, the film comprising an inner film 11 and an outer film 12;

The composite film is formed by dislocation of the inner film 11 and the outer film 12, and a port having a right-angled step shape is formed at opposite ends of the film, wherein the outer surface 111 of the inner film 11 at one port exposes the outer film 12, and the other The inner surface 11 of the outer membrane 12 is exposed at the port to expose the inner membrane 11; in the process, the positioning and recombination of the outer membrane 12 and the inner membrane 11 are controlled by the correcting device;

The sheet is wound into a tube, and the composite sheet is wound into a column shape so that the outer surface 12 of the outer film 12 exposed is overlapped on the outer surface 111 of the outer film 11 exposed, and the two outer surfaces of the outer film 12 are opposed. The ends are butted together in parallel so that the opposite ends of the inner membrane 11 are butted together in parallel;

Welding, the finished wound sheet is welded by a welding device, so that the inner film 11 and the outer film 12 are integrally joined, and the ends thereof are seamlessly welded together;

A seamless welded hose is produced by cutting, filling the shoulder, sealing, and covering the finished pipe.

In the above step of producing a film, the inner film 11 and the outer film 12 may be obtained by blow molding or tape casting.

Between the steps of fabricating the film and the composite film, the step of printing the film may be further included. The printing method of the outer film 12 can be printed on the surface or in the middle, and the printing method is flexible.

In summary, the seamless welded hose and the preparation method thereof in the embodiments of the present invention have the following advantages:

(1) Since the printing operation can be completed before the pipe making, that is, the printing is performed on the flat film first, and then the printed film is composited and rolled into a hose, which is compared with the conventional hose manufacturing process. After the printing process on the tube surface, the difficulty in the printing process is greatly reduced, the printing method is more flexible, and the printing pattern is more colorful, the printing rejection rate is greatly reduced, and the hose manufacturing cost is also significantly reduced.

(3) In the above embodiment, the inner tube 11 and the outer film 12 are misaligned and composited to directly produce the tube sheet, and the straight-angle stepped port is not required to be cut, and the hose manufacturing process is simple. At the same time, it can avoid the scrap rate caused by improper cutting or poor control, and the hose manufacturing cost is low.

(4) Since the outer film 12 can be printed or printed, the printing method of the hose made by laminating and welding the inner film 11 and the outer film 12 is enriched, so that it is no longer restricted to the surface. This will broaden the customer's choice of space.

The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection of the present invention. Within the scope.

Claims

A seamless welded hose comprising a tubular body, the tubular body comprising an inner membrane and an outer membrane stacked together; wherein the inner membrane and the outer membrane are misaligned together, and the tubular body is A circumferentially-shaped stepped port is formed at each of the circumferential ends, wherein the outer membrane is exposed at the outer surface of the inner membrane at one port, and the inner membrane is exposed at the outer surface of the outer membrane at the other port. The inner surface of the film is lap welded to the outer surface of the outer exposed inner film, and the circumferential ends of the outer film are welded together, and the circumferential ends of the inner film are welded together.
The seamless welded hose according to claim 1, wherein said outer film and inner film are of a single layer or a multilayer structure.
The seamless welded hose according to claim 1, wherein the outer film and the inner film have a thickness of not more than 300 μm.
A seamlessly welded hose according to claim 1 wherein one of said outer and inner films is printed with text or graphics.
A method of producing a seamless welded hose according to any one of claims 1 to 4, wherein the preparation method comprises the following steps:

Making a film comprising an inner film and an outer film;

a composite film, wherein the inner film and the outer film are misaligned to form a sheet, and the opposite ends of the sheet respectively form a port having a right-angled step shape, wherein the outer surface of the inner film at one port is exposed outside Membrane, while the inner surface of the outer membrane at the other port exposes the inner membrane;

Winding into a tube, the above-mentioned composite sheet is wound into a column shape, and the outer exposed inner surface of the outer film is overlapped on the outer surface of the outer exposed inner film, and two of the outer film are The opposite ends are butted together in parallel so that the opposite ends of the inner membrane are butted together in parallel;

Welding, the finished wound sheet is welded by a welding device such that the inner film and the outer film are integrally joined, and the ends thereof are seamlessly welded together.
The method of preparing a seamlessly welded hose according to claim 5, wherein in the step of fabricating the film, the inner film and the outer film are obtained by blow molding or tape casting.
A method of producing a seamlessly welded hose according to claim 5, further comprising the step of printing a film between said step of producing a film and a composite film.
The method of preparing a seamlessly welded hose according to claim 7, wherein the outer film is printed in a printed or printed form.
The method of manufacturing a seamless welded hose according to claim 5, wherein in the step of the composite film, the positioning and recombination of the outer film and the inner film are controlled by a correcting device.
The method of preparing a seamlessly welded hose according to claim 5, wherein the preparation method further comprises the following steps:

Cutting, filling, sealing and capping the finished welded pipe.