阅读说明：本技术 一种钢塑复合压力管端面密封方法 (End face sealing method for steel-plastic composite pressure pipe ) 是由 陈芹英 张晓琦 闫少辉 李桂红 马佳朝 于 2019-09-02 设计创作，主要内容包括：本发明公开了一种钢塑复合压力管端面密封方法,包括金属层,金属层的外圈设置有外层塑料,金属层的内圈设置有内塑塑料,金属层的端面设置有复合膜。本发明本发明采用塑料复合膜进行热压覆盖,复合膜与管材端面塑料复合包裹金属层,再通过切边修剪实现端面密封。薄膜热压封口过程产生热量小,不会破坏管材粘接性能,同时封口过程用时短,操作易于控制,可实现流水线作业。(The invention discloses a method for sealing the end face of a steel-plastic composite pressure pipe, which comprises a metal layer, wherein outer plastic layers are arranged on the outer ring of the metal layer, inner plastic layers are arranged on the inner ring of the metal layer, and a composite film is arranged on the end face of the metal layer. The invention adopts the plastic composite film to carry out hot-pressing covering, the composite film and the end surface of the pipe are compounded and wrapped with the metal layer, and then the end surface sealing is realized by trimming and trimming. The heat generated in the film hot-pressing sealing process is small, the adhesion performance of the pipe cannot be damaged, the sealing process is short in time, the operation is easy to control, and the assembly line operation can be realized.)

1. The end face of the steel-plastic composite pressure pipe is characterized by comprising a metal layer, wherein outer plastic is arranged on an outer ring of the metal layer, inner plastic is arranged on an inner ring of the metal layer, and a composite film is arranged on the end face of the metal layer.

2. The end face sealing method of the steel-plastic composite pressure pipe is characterized by comprising the following steps of:

s1: preparing an adhesive;

s2, drying: the temperature of the drying tunnel is between 30 and 70 ℃, the dryness of the adhesive layer is between 85 and 95 percent, and the drying time is between 30 and 60 min;

s3: hot-pressing and laminating: hot-pressing and covering the end surfaces of the composite film and the steel-plastic composite pressure pipe, adding a treated adhesive, and sealing the end surfaces;

s4: cutting and forming: the composite film is cut through the film cutting machine, so that the size of the cross section of the end face of the composite film is consistent with that of the cross section of the pressure pipe.

3. The method for sealing the end face of a steel-plastic composite pressure pipe as claimed in claim 2, wherein the adhesive comprises styrene-butadiene rubber solvent-based adhesive, polyurethane solvent-based adhesive, cellulose nitrate solvent-based adhesive, polyvinyl acetate solvent-based adhesive.

4. A method for end face sealing of a steel-plastic composite pressure pipe according to claim 2, characterized in that the hot-press covering is operated by a hot press.

Technical Field

The invention relates to the technical field of pressure pipes, in particular to a method for sealing the end face of a steel-plastic composite pressure pipe.

Background

The steel-plastic composite pressure pipe industry is a new industry which is just developed in recent years, and the pipe is a five-layer composite pipe which is provided with plastic layers on the inner side and the outer side, an argon arc butt-welded steel pipe is arranged in the middle, and the steel pipe and the plastic are bonded by a special adhesive, so that the pipe has the characteristics of high pressure bearing capacity, low price, small linear expansion coefficient, strong impact resistance, good insulating property, smooth inner wall, long service life and the like, and is seen by a plurality of manufacturers and users.

The steel-plastic composite pressure pipe needs to seal the end face so as to ensure the end face to be anticorrosive in the transportation and storage processes. At present, a steel belt layer is wrapped by melting plastics mainly by heating a pipe, the sealing process is long in time consumption and high in temperature and time control requirements, and meanwhile, the pipe bonding performance is influenced by heating.

Disclosure of Invention

The invention aims to solve the defects in the prior art and provides a method for sealing the end face of a steel-plastic composite pressure pipe.

In order to achieve the purpose, the invention adopts the following technical scheme:

the utility model provides a compound pressure pipe terminal surface is moulded to steel, includes the metal level, the outer lane of metal level is provided with outer plastics, and the inner circle of metal level is provided with interior plastics, the terminal surface of metal level is provided with the complex film.

The end face sealing method of the steel-plastic composite pressure pipe is characterized by comprising the following steps of:

s1: preparing an adhesive;

s2, drying: the temperature of the drying tunnel is between 30 and 70 ℃, the dryness of the adhesive layer is between 85 and 95 percent, and the drying time is between 30 and 60 min;

s3: hot-pressing and laminating: hot-pressing and covering the end surfaces of the composite film and the steel-plastic composite pressure pipe, adding a treated adhesive, and sealing the end surfaces;

s4: cutting and forming: the composite film is cut through the film cutting machine, so that the size of the cross section of the end face of the composite film is consistent with that of the cross section of the pressure pipe.

Preferably, the adhesive comprises a styrene butadiene rubber solvent-based adhesive, a polyurethane solvent-based adhesive, a cellulose nitrate solvent-based adhesive, and a polyvinyl acetate solvent-based adhesive.

Preferably, the hot press coating is operated using a hot press.

The invention has the beneficial effects that:

the invention adopts a plastic composite film to carry out hot-pressing covering, the composite film and the end surface of the pipe are compounded and wrapped with a metal layer, and then the end surface is sealed by trimming and trimming. The heat generated in the film hot-pressing sealing process is small, the adhesion performance of the pipe cannot be damaged, the sealing process is short in time, the operation is easy to control, and the assembly line operation can be realized.

Drawings

Fig. 1 is a structural side view of an end face of a steel-plastic composite pressure pipe.

1. Outer layer plastic, 2 metal layers, 3 inner plastic and 4 composite films.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments.