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CN-122014928-A - HDPE winding pipe and preparation method thereof

CN122014928ACN 122014928 ACN122014928 ACN 122014928ACN-122014928-A

Abstract

The invention relates to the technical field of pipe manufacture, in particular to an HDPE winding pipe and a preparation method thereof, comprising a winding strip which is spirally wound into a pipe shape along an axis, the winding strip comprises an outer tube and reinforcing ribs connected to the inner wall of the outer tube, wherein the reinforcing ribs comprise a foaming core layer of an inner layer and a solid layer positioned outside the foaming core layer. The strengthening rib sets up in the inside of outer tube, provides the support for overall structure, and the strengthening rib inlayer sets up the foaming sandwich layer, reduces the weight of tubular product, realizes the lightweight, and the skin is solid layer, and the density is high, guarantees the resistance to compression basis, and the pipe fitting has stronger top layer compressive property when guaranteeing the lightweight, saves the raw materials, accords with green manufacturing trend.

Inventors

  • YE MINGCHEN

Assignees

  • 云南联塑科技发展有限公司

Dates

Publication Date
20260512
Application Date
20260203

Claims (10)

  1. 1. HDPE wound pipe, comprising a winding strip helically wound into a tubular shape along an axis, characterized in that the winding strip comprises an outer pipe (100) and a reinforcing rib (200) connected to the inner wall of the outer pipe (100), the reinforcing rib (200) comprising an inner foamed core layer (210) and a solid layer (220) located outside the foamed core layer (210).
  2. 2. HDPE wound pipe according to claim 1, wherein the thickness of the foamed core layer (210) is 60% -80% of the total thickness of the reinforcing ribs (200).
  3. 3. The HDPE wound pipe according to claim 1, wherein the cross section of the reinforcing rib (200) is cross-shaped, the cross section of the outer pipe (100) is quadrilateral, and four support arms of the reinforcing rib (200) are respectively connected with four inner side surfaces of the outer pipe (100).
  4. 4. HDPE wound pipe according to claim 1, characterized in that a melt adhesive layer (300) is also provided between the winding gaps of the winding strips.
  5. 5. HDPE wound pipe according to claim 1, characterized in that the outer pipe (100) is integrally formed with the reinforcing ribs (200).
  6. 6. A method of producing a HDPE wound pipe as claimed in any one of claims 1 to 5, comprising the steps of: the method comprises the steps of preparing raw materials, adding pure HDPE resin into a first extruder for melting to obtain a solid layer melt, mixing the HDPE resin, an AC foaming agent, zinc oxide and zinc stearate, adding into a second extruder for melting to obtain a core layer melt, adding the pure HDPE resin into a third extruder for melting to obtain an outer tube melt; Extruding the solid layer melt and the core layer melt to a coextrusion die through a first extruder and a second extruder respectively, and forming through the coextrusion die to obtain the reinforcing rib; step three, shaping, namely cooling and shaping the shaped reinforcing ribs; extruding the outer tube melt to a forming die through a third extruder, obtaining an outer tube through the forming die, drawing the shaped reinforcing ribs into the outer tube, compositing the reinforcing ribs and the outer tube to form a winding strip, and cooling and shaping the shaped winding strip; And fifthly, winding and forming, namely conveying the formed winding strip to a winding machine, heating and softening the winding strip, winding the winding strip on the outer side of the die according to a spiral angle, cooling the wound pipe, and solidifying and forming the final pipe.
  7. 7. The method of claim 6, wherein in the first step, the first extruder and the second extruder are controlled to have a lower pressure of the core melt than the solid melt.
  8. 8. The method of claim 6, wherein in the first step, the first extruder and the second extruder are controlled so that the temperature of the melt of the solid layer is higher than the temperature of the melt of the core layer.
  9. 9. The preparation method of the HDPE winding pipe according to claim 6, wherein the core melt comprises 100 parts by weight of HDPE resin, 0.5-1.0 part by weight of AC foaming agent, 0.1-0.3 part by weight of zinc oxide and 0.2-0.5 part by weight of zinc stearate.
  10. 10. The method of producing a HDPE wound pipe according to claim 9 wherein the AC blowing agent is of bimodal particle size distribution, mixed with particles of 6-10 μm and 20-30 μm in a 1:1 ratio.

Description

HDPE winding pipe and preparation method thereof Technical Field The invention relates to the technical field of pipe manufacturing, in particular to an HDPE winding pipe and a preparation method thereof. Background HDPE hollow wall winding pipe has become an important pipe choice in the fields of municipal drainage, sewage disposal systems, agricultural irrigation and the like by virtue of excellent corrosion resistance, high ring stiffness and long service life. In the current production technology, the reinforcing ribs of the winding pipes are mainly designed into solid, hollow or physically open-pore structural forms, and the forms directly influence the mechanical properties, the material consumption and the engineering applicability of the pipes. However, the existing hollow wall winding pipe has obvious performance and cost balance problems in the reinforcing rib structure, namely if a solid reinforcing rib is adopted, higher ring rigidity and compression resistance can be ensured, raw material consumption can be obviously increased, the self weight of the pipe body is increased, the comprehensive cost of transportation, carrying and construction and installation is greatly improved, and if the hollow or open-pore reinforcing rib is adopted for reducing the weight, the ring rigidity of the pipe is weakened to a certain extent, the external compression resistance is reduced, and engineering scenes with higher requirements on deep buried laying and the like are difficult to meet. For example, SN8 grade tubing, which is common in the market today, is often limited by insufficient strength in deep buried applications. In the occasion of needing larger burial depth or higher external pressure tolerance in many projects, the pipe with higher ring stiffness level has to be selected or other materials are changed, which not only increases the project cost, but also limits the application of the HDPE hollow wall winding pipe in wider scenes. Disclosure of Invention The invention aims to solve the problem that the prior art lacks a reinforcing rib structure with light weight and high strength, and provides a winding pipe and a preparation method thereof, so that the pipe fitting has strong surface layer compression resistance while ensuring light weight. In order to solve the technical problems, the invention adopts the following technical scheme: The HDPE winding pipe comprises a winding strip, wherein the winding strip is spirally wound into a pipe shape along an axis, the winding strip comprises an outer pipe and reinforcing ribs connected to the inner wall of the outer pipe, and the reinforcing ribs comprise a foaming core layer of an inner layer and a solid layer positioned outside the foaming core layer. According to the HDPE winding pipe provided by the invention, the reinforcing ribs are arranged in the outer pipe, so that the support is provided for the integral structure, the foaming core layer is arranged on the inner layer of the reinforcing ribs, the weight of the pipe is reduced, the outer layer is a solid layer, the density is high, the compression-resistant foundation is ensured, the pipe fitting has strong surface layer compression resistance while the weight is reduced, the raw materials are saved, and the environment-friendly manufacturing trend is met. Further, the thickness of the foaming core layer accounts for 60% -80% of the total thickness of the reinforcing ribs, the ratio of the foaming core layer needs to be kept in a proper range, the ratio is too high, the strength of the reinforcing ribs is insufficient, the whole compressive property of the pipe fitting is reduced, the pipe fitting is too heavy due to the fact that the ratio is too low, manufacturing materials are wasted, and the conveying is not facilitated. Further, the cross section of the reinforcing rib is cross-shaped, the cross section of the outer tube is quadrilateral, and four support arms of the reinforcing rib are respectively connected with four inner side surfaces of the outer tube. The four relatively weak surfaces of the outer tube are supported by the cross-shaped reinforcing ribs, so that the ring rigidity of the HDPE hollow wall winding tube can be effectively improved. Further, a fusion bonding layer is arranged between the winding gaps of the winding strips. Here, the winding gap refers to a gap existing between two adjacent turns when the winding strip is wound, and the fusion bonding layer is arranged in the winding gap, so that the long-strip-shaped winding strip is better wound and formed into a spirally-shaped winding pipe, and the strength of the winding pipe is further enhanced. Further, the outer tube and the reinforcing ribs are integrally formed. The preparation method of the HDPE winding pipe comprises the following steps: the method comprises the steps of preparing raw materials, adding pure HDPE resin into a first extruder for melting to obtain a solid layer melt, mixing the HDPE resin, an AC fo