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  4. Past and present of PVC porous communica...

Past and present of PVC porous communication tube

PVC porous communication tube (grid tube) was originally used to replace the traditional cement tube block, steel tube casing and other protective sleeves, used for the penetration, isolation and protection of underground communication cables, which has improved work efficiency, cost savings, and installation The obvious advantages of convenience, reliability and reliability are gradually widely used in underground communication pipelines. At present, due to the variety of optical cable specifications, there are many manufacturers of PVC porous communication tubes and PVC porous plastic tubes. They have shown their magic in cross-section design and processing technology. Most of them have applied for patent protection, and there is no uniformity in the entire communications industry. According to regulations, the specifications of porous tubes are also varied. According to the processing method, PVC porous pipes can be divided into assembled and integral types; according to the cross-sectional shape, they can be divided into square hole combinations, round hole combinations, and honeycomb (regular hexagonal hole) combinations; And the same diameter combination. More commonly used porous pipes are integral PVC porous pipes composed of square holes of the same size. The integral PVC porous communication tube (grid tube) is manufactured by twin screw extruder and die at one time.

The advantage is that the processing is simple, no complicated assembly process and assembly parts are needed, the working efficiency is improved, and the processing cost is reduced. According to the similarities and differences in cross-sectional shape and aperture, the specifications of integral PVC porous pipes are also varied. For example, nine-hole, four-hole, five-hole, six-hole, seven-hole and one-hole are often used in engineering. PVC porous communication tube (grid tube) specification example (take nine holes and four holes as an example) Unit: mm Specification inner hole size inner hole number length nine hole square 28X28 9 6000 nine hole square 33X33 9 6000 four hole square 28X28 4 6000 Four-hole square 33X33 4 6000 Four-hole square 42X42 4 6000 Four-hole square 50X50 4 6000 Production of PVC porous communication tube (grid tube)

The production of porous tube is almost the same as the production of PVC-U plastic profile, the process is simple, the product There are many varieties and widely used. Production process flow of PVC porous communication tube (grid tube) Mixing ingredients → Extrusion → Integral porous tube The appearance of PVC porous communication tube (grid tube), the color of the color porous tube should be uniform and consistent, and it is not allowed to affect the use of Bubbles, cracks and impurities. The end of the tube should be cut flat and perpendicular to the axis. The color of the porous tube is generally white or light gray, and special requirements are agreed between the supplier and the buyer. The length of the PVC porous pipe is generally 6m, and the special requirements are agreed by both parties. The length deviation is ± 20mm.

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