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Online biaxial-orienting PVC extrusion molding mould

A technology of extrusion molding and biaxial orientation, which is applied in the field of online biaxial orientation PVC extrusion molding molds, can solve the problems that the strength and toughness of pipe products cannot be guaranteed, and achieve a wide-ranging effect

Active Publication Date: 2011-06-15
浙江驰讯管业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention does not limit the specific characteristics of the mold, and cannot guarantee the strength and toughness of the pipe product

Method used

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  • Online biaxial-orienting PVC extrusion molding mould

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1: Extrusion of DN200×4.4, PN1.0 online biaxially oriented pressure-bearing pipe. According to the specified formula, the materials will be mixed and added to the twin-screw extruder. Under the specified process conditions, they will be fully plasticized and extruded to enter the mold of the present invention. The materials will enter the tube embryo forming area after secondary compression 1. Expansion transition Zone 2, ring expansion forming zone 3, rapidly cooling and shaping under traction. The characteristic value of the mold: the compression ratio is 1: (8-9), the length of the straight section is (6-7) times the diameter of the tube blank, and the ratio of the section of the expanded tube to the section of the tube blank is 1: (1.20-1.25 ), the circumferential expansion ratio is ≥1:2, the expansion angle is (40-50)°; the stretching temperature is (135-145)°C, the temperature of the expansion medium is (120-130)°C, and the pressure is ( 10-20) kPa, the t...

Embodiment 2

[0020] Embodiment 2: the implementation process is the same as in embodiment 1, the characteristic value of the mould: the compression ratio is 1: (7-8), the length of the straight section is (7-8) times of the diameter of the tube embryo, and the cross-section of the pipe after expansion The section ratio to the tube embryo is 1:(1.25-1.30), the circumferential expansion ratio is ≥1:2, and the expansion angle is 35°; the stretching temperature is (130-140)°C, and the temperature of the expansion medium is (120 -135)°C, the pressure is (8-14)kPa, the temperature of the external cooling medium is room temperature, and the traction speed is (0.65-0.80)m / min. Main properties of the pipe: impact resistance, 0°C, 1h, 4kg×2m hammer head diameter 25mm, impact 25 times, no damage, TIR<10%; instantaneous burst pressure of the pipe is 3.6MPa.

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Abstract

The invention relates to an online biaxial-orienting PVC extrusion molding mould comprising a skelp molding area, an expansion transition area and an annular expansion and molding area and also provided with an expansion mold core. A heating pressure channel is arranged in the skelp molding area. The section ratio between an expanded pipe material and a skelp is 1 :( 1.10-1.30). An expansion pressure balancing device is arranged in the expansion transition area. An expansion angle of the expansion transition area is 30-60 degrees. Annular expansion ratio of the annular expansion and molding area is greater than or equal to 1:2. The mould has a compression ratio of 1 :( 6-12). A straight section of the skelp molding area is 5-12 times as long as the diameter of the skelp. The mould has theadvantages that an online biaxial-oriented modified pressure-bearing pipe material with good strength and tenacity and smooth and flat surface can be produced, and the mould saves material and energyand can implement industrialization.

Description

technical field [0001] The invention belongs to a polymer processing molding die, in particular to an online biaxially oriented PVC extrusion molding die. Background technique [0002] When the thermoplastic pipe is extruded, it is biaxially stretched in the longitudinal and transverse directions of the plane. The products after biaxial stretching show high physical and mechanical properties, greatly improve their strength and toughness, and greatly reduce the consumption of materials, and have a wide range of applications, such as in the water supply pipe market and mine pipes , non-excavation laying and repair pipeline market, gas pipeline network, etc. [0003] The Chinese patent No. 03117548.1 disclosed a "manufacturing method of biaxially oriented rigid polyvinyl chloride pipe" on August 27, 2003. The method uses polyvinyl chloride and ingredients, and passes through a forming mold through a series of steps. , complete biaxial orientation stretching, and obtain pipe p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C55/26B29C47/12B29K27/06B29C48/30
Inventor 吴小波叶贵坤
Owner 浙江驰讯管业有限公司
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