One-step forming equipment and process of polyolefin polyurethane thermal insulation composite tube

A thermal insulation compounding and forming equipment technology, which is applied in the field of polyolefin polyurethane thermal insulation composite pipe forming, can solve the problem of insufficient bonding force between the working tube and the polyurethane thermal Moderate problems, to achieve the effect of stable and reliable product quality, satisfactory axial shear strength, and stable work

Pending Publication Date: 2019-04-02
LINHAI WEIXING NEW BUILDING MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the "one-step method" at this stage mainly has the following problems: 1. The bonding force between the working tube and the polyurethane insulation layer is not enough, and the axial shear strength cannot meet the standard requirements; A layer of plastic film is usually used in between, and there is no adhesive force between the polyurethane insulation layer and the outer protective tube; 3. The coil unwinding type is mostly used, which cannot guarantee the straightness of the working tube, let alone the alignment of the working tube; 4. The foaming equipment is unstable, and the foaming effect of the same batch is often inconsistent.

Method used

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  • One-step forming equipment and process of polyolefin polyurethane thermal insulation composite tube

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Experimental program
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Effect test

Embodiment 1

[0025] Such as figure 1 As shown, the polyolefin polyurethane thermal insulation composite pipe one-step molding equipment of the present invention includes a polyolefin inner pipe extruder 1, a vacuum sizing box 3, a spray box 4, and a blast dryer 5 arranged in sequence from left to right , the first haul-off machine 6, plasma processor 7, foaming and setting device, coating extruder 12, the second haul-off machine 14, infrared thickness gauge 15, cutting machine 16 and material turning platform 17; The foaming and setting The device includes a foaming and setting mold 11, a polyurethane high-pressure foaming machine 9 and a mold temperature controller 10; the mold temperature controller 10 is connected with the polyurethane high-pressure foaming machine 9, and the polyurethane high-pressure foaming machine 9 is provided with a high-pressure mixing gun Head 8, the high-pressure mixing gun head 8 is connected with the foaming shaping mold 11.

[0026] The molding equipment of...

Embodiment 2

[0036] The one-step molding process of polyolefin polyurethane thermal insulation composite pipe includes the following steps:

[0037] 1) Add the polyolefin raw material to the polyolefin inner tube extruder 1, and the polyolefin inner tube extruder 1 extrudes the inner tube 2, and the inner tube 2 is pulled downstream by two tractors before and after, and the first tractor 6 The traction speed is S, and the traction speed of the second tractor 14 is S+0.05m / min to ensure that the inner pipe 2 is in a straightened state;

[0038] 2) The inner pipe 2 is successively sized through the vacuum sizing box 3, cooled by the spray cooling box 4 and dried by the blast dryer 5;

[0039] 3) Plasma treatment of the inner tube 2 by the plasma processor 7, so that the outer surface of the inner tube 2 changes from non-polar to polar, and enhances the bonding force between the inner tube 2 and polyurethane;

[0040] 4) Adjust the mold temperature controller 10 to the set temperature, mix p...

Embodiment 3

[0045]To produce pipes with an outer diameter of the inner pipe 2 of dn32, the production speed of the inner pipe 2 is 10-12m / min, and the extrusion rate of the polyolefin inner pipe extruder 1 is 2.78-3.34kg / min. The inner pipe 2 reaches the plasma processor 7 through the vacuum sizing box 3, the spray cooling box 4, the blast dryer 5 and the first tractor 6. Foaming and setting mold 11, the temperature of mold temperature controller 10 is adjusted to 23°C, and the pulling speed of the second downstream pulling machine 14 is adjusted to 10.05-12.05m / min to ensure that the inner tube 2 is in a straightened state, and then the polyurethane A material (combined Polyether) and material B (isocyanate and polyol) are mixed and injected into the pouring die head of the foaming shaping mold 11 through the high-pressure mixing gun head 8, and the inner tube 2 enters the shaping module of the foaming shaping mold 11 to form a 30mm insulation layer, polyurethane foam The pouring amount ...

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Abstract

The invention discloses one-step forming equipment of a polyolefin polyurethane thermal insulation composite tube. The equipment comprises a polyolefin inner tube extruding machine, a vacuum sizing box, a spraying cooling box, a blowing dryer, a first traction machine, a plasma processor, a foaming and shaping device, a coating extruder and a second traction machine, and the foaming and shaping device comprises a foaming and shaping mold, a polyurethane high-pressure foaming machine and a mold temperature controller. The invention further discloses a one-step forming process of the polyolefinpolyurethane thermal insulation composite tube. Compared with an existing two-step method, the tube length can be customized, the production efficiency is improved, and the product quality is guaranteed; and compared with an existing one-step method, bonding force between an inner tube and a polyurethane heat preservation layer is improved, the axial shearing strength meets the standard requirements, and the product quality is stable and reliable; and the polyurethane heat preservation layer and an outer protection layer are in direct contact, so that the bonding force is guaranteed, the two traction machines are arranged on the upstream and the downstream correspondingly, and differential traction of the two traction machines is carried out, so that the straightness and centering of the inner tube are ensured.

Description

technical field [0001] The invention relates to the technical field of polyolefin polyurethane thermal insulation composite pipe forming, in particular to polyolefin polyurethane thermal insulation composite pipe one-step forming equipment and technology. Background technique [0002] Polyolefin polyurethane thermal insulation composite pipe is widely used in the secondary pipe network of central heating and the transportation of hot spring water. The working pipe has the advantages of light weight, corrosion resistance, no scaling, long service life, and convenient installation. At present, the production process of polyurethane insulation pipe has "one-step method" and "two-step method". The "two-step method" refers to inserting the working tubes into the outer protective tube one by one for polyurethane insulation. The efficiency is low, the foaming is uneven, and the working tubes are easy to be damaged in the process of threading the tubes. "One-step method" refers to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C69/00B29C48/09B29C44/32B29K23/00B29K75/00B29L23/00
CPCB29C44/1271B29C69/001B29K2023/00B29K2075/00B29L2023/22
Inventor 靳铁标黄咸伟高莉毛星剑
Owner LINHAI WEIXING NEW BUILDING MATERIALS CO LTD
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