WO2016078427A1 - Dual-path gas injection system used for physical foaming process, and gas injection method for dual-path gas injection system - Google Patents

Dual-path gas injection system used for physical foaming process, and gas injection method for dual-path gas injection system Download PDF

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WO2016078427A1
WO2016078427A1 PCT/CN2015/083430 CN2015083430W WO2016078427A1 WO 2016078427 A1 WO2016078427 A1 WO 2016078427A1 CN 2015083430 W CN2015083430 W CN 2015083430W WO 2016078427 A1 WO2016078427 A1 WO 2016078427A1
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gas
gas injection
pressure
octafluorocyclobutane
path
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PCT/CN2015/083430
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French (fr)
Chinese (zh)
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吴付亮
刘诗涛
王祺
王平安
蓝燕锐
缪园园
黄德兵
许海军
杨建平
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中天日立射频电缆有限公司
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Publication of WO2016078427A1 publication Critical patent/WO2016078427A1/en

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C44/00Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/34Auxiliary operations
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/10Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working

Abstract

The present invention relates to a dual-path gas injection system applied to a physical foaming and insulating process, and a gas injection method for the dual-path gas injection system. The degree of foaming of a leaky cable is increased, and a high degree of foaming is achieved while the stability and uniformity of a foaming process are ensured, improving product performance and reducing product costs. The present invention is particularly suitable for a polyethylene insulation material physical foaming process. The dual-path gas injection system used for a physical foaming process comprises a carbon dioxide gas injection device portion and an octafluorocyclobutane gas injection device portion. The carbon dioxide gas injection device comprises a quantitative gas injection needle, a gas path, a gas injection machine and a gas cylinder. The gas cylinder is connected to a gas pipe and then connected to the gas injection machine, the gas injection machine stores gas to a set pressure then injects a gas at a set pressure into an extrusion machine via the quantitative gas injection needle connected by a gas pipe, and the gas is dissolved in a molten polyethylene foaming material, forming a fine cell structure. The octafluorocyclobutane gas injection device comprises a nitrogen gas cylinder, an octafluorocyclobutane gas cylinder, a gas pipe, a variable-frequency drive, a quantitative pump, a pressure relief valve, a gas path and a quantitative gas injection needle. Nitrogen in the nitrogen gas cylinder enters the octafluorocyclobutane gas cylinder via the gas pipe, and provides pressure for liquid-state octafluorocyclobutane for flowing into the gas path. The octafluorocyclobutane cylinder is connected to the quantitative pump by the gas path, after the liquid-state gas has entered the gas path, a motor is controlled by the variable-frequency drive to enable the quantitative pump to operate, the octafluorocyclobutane liquid enters the gas path after exiting the quantitative pump, the pressure within the gas path is controlled by the pressure relief valve, and when the gas pump discharge pressure exceeds a pressure relief valve set pressure, the pressure relief valve automatically ejects the liquid-state gas. The gas remains in a liquid state within the gas path, and is only converted from the liquid state to a gaseous state when passing through a final pipe. The gas is then injected into the extrusion machine via the quantitative gas injection needle, and similarly dissolved in the molten polyethylene foaming material, forming a fine cell structure.

Description

一种用于物理发泡过程的双路注气系统及其注气方法Dual-channel gas injection system for physical foaming process and gas injection method thereof 技术领域Technical field
本发明涉及的是一种运用于物理发泡绝缘工序的双路注气系统及其注气方法,针对如何提高漏泄电缆发泡度这一问题提出的解决方案,在达到高发泡度的同时,保证发泡过程的稳定及均匀,既提高了产品的性能,又降低了生产成本。特别适用于聚乙烯绝缘材料的物理发泡过程。The invention relates to a double-channel gas injection system applied to a physical foaming insulation process and a gas injection method thereof, and a solution proposed for how to improve the foaming degree of a leaky cable, while achieving a high degree of foaming, It ensures the stability and uniformity of the foaming process, which not only improves the performance of the product, but also reduces the production cost. It is especially suitable for the physical foaming process of polyethylene insulation materials.
背景技术Background technique
目前漏泄电缆物理发泡一般采用氮气或二氧化碳单气体进行物理发泡,氮气发泡度只能达到70%左右,而二氧化碳发泡的泡孔较大,容易导致发泡层出现大的泡孔,电缆芯线的绝缘层是传输通信信号的主要介质,因而绝缘层加工工艺的好坏直接影响着漏泄电缆的性能指标,上诉采用单气体发泡所产生的缺陷严重制约了缆芯的电气性能及生产成本。At present, physical foaming of leaky cables is generally carried out by using nitrogen or carbon dioxide gas for physical foaming. The degree of nitrogen foaming can only reach about 70%, while the pores of carbon dioxide foaming are large, which tends to cause large cells in the foamed layer. The insulation layer of the cable core is the main medium for transmitting communication signals. Therefore, the processing technology of the insulation layer directly affects the performance index of the leaky cable. The defects caused by the single gas foaming appeal seriously restrict the electrical performance of the cable core and Cost of production.
发明内容Summary of the invention
本发明目的是针对上述注气方式不足之处提供一种双路注气系统及其注气方法,采用二氧化碳和八氟环丁烷两种气体双路注气,不仅能使发泡度达到要求,而且保证了泡孔的细密性、均匀性和一致性,大大提高产品的性能。The object of the present invention is to provide a two-way gas injection system and a gas injection method thereof for the above-mentioned insufficiency of the gas injection method, and the two-way gas injection of carbon dioxide and octafluorocyclobutane can not only achieve the foaming degree. Moreover, the fineness, uniformity and consistency of the cells are ensured, and the performance of the product is greatly improved.
一种用于物理发泡过程的双路注气系统采取以下技术方案实现:A dual gas injection system for a physical foaming process is implemented by the following technical solutions:
一种用于物理发泡过程的双路注气系统包括二氧化碳注气装置和八氟环丁烷注气装置两部分。二氧化碳注气装置包括定量注气针、气路、注气机和气瓶;气瓶与气管连接后接注气机,注气机储气至设定压力再由气管接定量注气针将设定压力的气体注入挤塑机,溶解于熔融状态的聚乙烯发泡料中,形成微细的泡孔结构。八氟环丁烷注气装置包括氮气气瓶、八氟环丁烷气瓶、气管、变频器、定量泵、减压阀、气路和定量注气针;氮气瓶内氮气由气管进入八氟环丁 烷气瓶,为液态八氟环丁烷提供流入气路的压力;八氟环丁烷钢瓶通过气路与定量泵连接,当液态气体进入气路后通过变频器来控制电机来使定量泵工作,八氟环丁烷液体从定量泵出来后进入气路,通过减压阀来控制气路中的压力,当气泵吐出压力超过减压阀设定压力时,减压阀自动注出液态气体;气体在气路中一直是液态形式,只有经过最后一节管路时由液态转化为气态,再由定量注气针注入挤塑机,同样溶解于熔融状态的聚乙烯发泡料中,形成微细的泡孔结构。A dual gas injection system for a physical foaming process includes a carbon dioxide gas injection device and an octafluorocyclobutane gas injection device. The carbon dioxide gas injection device includes a quantitative gas injection needle, a gas path, a gas injection machine and a gas cylinder; the gas cylinder is connected with the gas pipe and then connected to the gas injection machine, and the gas injection machine stores the gas to the set pressure, and then the gas injection pipe is connected to the gas injection needle to set the gas injection needle. The pressurized gas is injected into the extruder and dissolved in the molten polyethylene foam to form a fine cell structure. The octafluorocyclobutane gas injection device includes a nitrogen gas cylinder, an octafluorocyclobutane gas cylinder, a gas pipe, a frequency converter, a quantitative pump, a pressure reducing valve, a gas path and a quantitative gas injection needle; the nitrogen gas in the nitrogen bottle enters the octafluorocarbon from the gas pipe Ring An alkane gas cylinder provides a pressure for the liquid octafluorocyclobutane to flow into the gas path; the octafluorocyclobutane cylinder is connected to the metering pump through the gas path, and when the liquid gas enters the gas path, the motor is controlled by the frequency converter to operate the metering pump. The octafluorocyclobutane liquid enters the gas path from the metering pump, and the pressure in the gas path is controlled by the pressure reducing valve. When the pumping pressure exceeds the set pressure of the pressure reducing valve, the pressure reducing valve automatically injects the liquid gas; The gas is always in a liquid form in the gas path. It is converted from a liquid state to a gaseous state only after passing through the last section of the pipeline, and then injected into the extruder by a quantitative gas injection needle, which is also dissolved in the molten polyethylene foam to form a fine Cell structure.
一种用于物理发泡过程的双路注气系统的注气方法如下:A gas injection method for a two-way gas injection system for a physical foaming process is as follows:
一种用于物理发泡过程的双路注气系统由二氧化碳注气系统和八氟环丁烷注气系统配合使用,二氧化碳和八氟环丁烷分两路注气注入挤塑机,在挤塑机转动之前,双路注气装置先打开,防止发泡料将定量注气针堵塞;为了增加二氧化碳的溶解度,机筒注气段的压力一般保持在200bar以上,而注气压力则需超过注入段机膛压力,二氧化碳注气压力一般控制在250-350bar之间,而八氟环丁烷注气压力换算成流量大约保持在150-240ml/min之间;挤塑机打开后,融融状态的发泡料到达二氧化碳和八氟环丁烷注气处,二氧化碳气体与之融合,达到发泡效果,而在八氟环丁烷作用下,两者融合的更加细密、均匀,在达到高发泡度的同时,保证泡孔与泡孔间不产生破裂,既在减少发泡料使用的同时,又提高了缆芯的性能。A dual gas injection system for physical foaming process is used by a carbon dioxide gas injection system and an octafluorocyclobutane gas injection system, and carbon dioxide and octafluorocyclobutane are injected into the extruder in two ways. Before the press rotates, the dual gas injection device is first opened to prevent the foaming material from clogging the quantitative gas injection needle; in order to increase the solubility of carbon dioxide, the pressure of the gas injection section of the barrel is generally maintained above 200 bar, and the gas injection pressure needs to be exceeded. Injecting the section 膛 pressure, the carbon dioxide injection pressure is generally controlled between 250-350 bar, and the octafluorocyclobutane gas injection pressure is converted into a flow rate of about 150-240 ml / min; after the extruder is opened, the melt state The foaming material reaches the carbon dioxide and octafluorocyclobutane gas injection, and the carbon dioxide gas is fused with it to achieve the foaming effect, and under the action of octafluorocyclobutane, the fusion of the two is more fine and uniform, and the high foaming is achieved. At the same time, it does not cause cracks between the cells and the cells, which not only reduces the use of the foaming material, but also improves the performance of the cable core.
本发明一种用于物理发泡过程的双路注气系统及其注气方法特点:The invention relates to a dual gas injection system for physical foaming process and a gas injection method thereof:
本发明一种用于物理发泡过程的双路注气系统设计合理,结构紧凑,由于二氧化碳发泡的泡孔较大,容易导致发泡层出现大的泡孔,生产出的缆芯由于发泡层不均匀导致电缆衰减和驻波性能较差,采用此双路注气设计方法后消除了此现象且保证了发泡绝缘层泡孔的均匀细密,同时生产相同规格型号电缆用料 更少,大幅降低了生产成本。The double-injection gas injection system for physical foaming process has reasonable design and compact structure, and the large diameter of the foaming layer is easy to cause large bubbles in the foaming layer, and the produced cable core is produced. The unevenness of the bubble layer leads to poor cable attenuation and standing wave performance. This double-channel gas injection design method eliminates this phenomenon and ensures uniform and fine cells of the foamed insulation layer, and simultaneously produces cable materials of the same specification type. Less, significantly reducing production costs.
在原有注气设备的不变的情况下,另外增加一套八氟环丁烷注气装置,八氟环丁烷在泵和气路中以液态形式存在,在到达气针前转换为气体,注气系统通过设定变频器频率控制注入挤塑机的气体量,八氟环丁烷气体与二氧化碳气体通过两个定量注气针分别注入但同时作用与发泡料进行物理发泡过程,既相互作用又互不干扰,简易方便。本发明特别适用于射频电缆、漏泄电缆的物理发泡绝缘生产过程中注气发泡。In the case of the original gas injection equipment, an additional octafluorocyclobutane gas injection device is added. The octafluorocyclobutane exists in a liquid form in the pump and the gas path, and is converted into a gas before reaching the gas needle. The gas system controls the amount of gas injected into the extruder by setting the frequency of the inverter. The octafluorocyclobutane gas and the carbon dioxide gas are separately injected through two quantitative gas injection needles, but at the same time, the foaming material is physically foamed, and mutual The functions do not interfere with each other, and are simple and convenient. The invention is particularly suitable for gas injection foaming in the production process of physical foam insulation of radio frequency cable and leaky cable.
附图说明DRAWINGS
以下将结合附图对本发明作进一步说明:The invention will be further described below in conjunction with the accompanying drawings:
图1是一种用于物理发泡过程的双路注气系统结构示意图。Figure 1 is a schematic view showing the structure of a two-way gas injection system for a physical foaming process.
具体实施方式detailed description
参照附图1,一种用于物理发泡过程的双路注气系统包括二氧化碳注气装置和八氟环丁烷注气装置两部分。二氧化碳注气装置包括定量注气针、气路、注气机和气瓶;气瓶与气管连接后接注气机,注气机储气至设定压力再由气管接定量注气针将设定压力的气体注入挤塑机,溶解于熔融状态的聚乙烯发泡料中,形成微细的泡孔结构。八氟环丁烷注气装置包括氮气气瓶、八氟环丁烷气瓶、气管、变频器、定量泵、减压阀、气路和定量注气针;氮气瓶内氮气由气管进入八氟环丁烷气瓶,为液态八氟环丁烷提供流入气路的压力;八氟环丁烷钢瓶通过气路与定量泵连接,当液态气体进入气路后通过变频器来控制电机来使定量泵工作,八氟环丁烷液体从定量泵出来后进入气路,通过减压阀来控制气路中的压力,当气泵吐出压力超过减压阀设定压力时,减压阀自动注出液态气体;气体在气路中一直是液态形式,只有经过最后一节管路时由液态转化为气态,再由定量注气针注入挤塑机,同样溶解于熔融状态的聚乙烯发泡料中,形成微 细的泡孔结构。Referring to Figure 1, a dual gas injection system for a physical foaming process includes a carbon dioxide gas injection device and an octafluorocyclobutane gas injection device. The carbon dioxide gas injection device includes a quantitative gas injection needle, a gas path, a gas injection machine and a gas cylinder; the gas cylinder is connected with the gas pipe and then connected to the gas injection machine, and the gas injection machine stores the gas to the set pressure, and then the gas injection pipe is connected to the gas injection needle to set the gas injection needle. The pressurized gas is injected into the extruder and dissolved in the molten polyethylene foam to form a fine cell structure. The octafluorocyclobutane gas injection device includes a nitrogen gas cylinder, an octafluorocyclobutane gas cylinder, a gas pipe, a frequency converter, a quantitative pump, a pressure reducing valve, a gas path and a quantitative gas injection needle; the nitrogen gas in the nitrogen bottle enters the octafluorocarbon from the gas pipe The cyclobutane gas cylinder provides the pressure of the inflow gas path for the liquid octafluorocyclobutane; the octafluorocyclobutane cylinder is connected to the metering pump through the gas path, and the liquid gas enters the gas path and then controls the motor through the frequency converter to make the quantification When the pump works, the octafluorocyclobutane liquid enters the gas path from the metering pump, and the pressure in the gas path is controlled by the pressure reducing valve. When the pumping pressure exceeds the set pressure of the pressure reducing valve, the pressure reducing valve automatically injects the liquid. Gas; the gas is always in a liquid form in the gas path, and is converted from a liquid state to a gaseous state only after passing through the last section of the pipeline, and then injected into the extruder by a quantitative gas injection needle, which is also dissolved in the molten polyethylene foam. Forming micro Fine cell structure.
一种用于物理发泡过程的双路注气系统的注气方法如下:A gas injection method for a two-way gas injection system for a physical foaming process is as follows:
一种用于物理发泡过程的双路注气系统由二氧化碳注气系统和八氟环丁烷注气系统配合使用,二氧化碳和八氟环丁烷分两路注气注入挤塑机,在挤塑机转动之前,双路注气装置先打开,防止发泡料将定量注气针堵塞;为了增加二氧化碳的溶解度,机筒注气段的压力一般保持在200bar以上,而注气压力则需超过注入段机膛压力,二氧化碳注气压力一般控制在250-350bar之间,而八氟环丁烷注气压力换算成流量大约保持在150-240ml/min之间;挤塑机打开后,融融状态的发泡料到达二氧化碳和八氟环丁烷注气处,二氧化碳气体与之融合,达到发泡效果,而在八氟环丁烷作用下,两者融合的更加细密、均匀,在达到高发泡度的同时,保证泡孔与泡孔间不产生破裂,既在减少发泡料使用的同时,又提高了缆芯的性能。A dual gas injection system for physical foaming process is used by a carbon dioxide gas injection system and an octafluorocyclobutane gas injection system, and carbon dioxide and octafluorocyclobutane are injected into the extruder in two ways. Before the press rotates, the dual gas injection device is first opened to prevent the foaming material from clogging the quantitative gas injection needle; in order to increase the solubility of carbon dioxide, the pressure of the gas injection section of the barrel is generally maintained above 200 bar, and the gas injection pressure needs to be exceeded. Injecting the section 膛 pressure, the carbon dioxide injection pressure is generally controlled between 250-350 bar, and the octafluorocyclobutane gas injection pressure is converted into a flow rate of about 150-240 ml / min; after the extruder is opened, the melt state The foaming material reaches the carbon dioxide and octafluorocyclobutane gas injection, and the carbon dioxide gas is fused with it to achieve the foaming effect, and under the action of octafluorocyclobutane, the fusion of the two is more fine and uniform, and the high foaming is achieved. At the same time, it does not cause cracks between the cells and the cells, which not only reduces the use of the foaming material, but also improves the performance of the cable core.
一种用于物理发泡过程的双路注气系统及其注气方法,其特征在于在原有注气设备的不变的情况下,另外增加一套八氟环丁烷注气装置;八氟环丁烷注气系统包括氮气气瓶、八氟环丁烷气瓶、气管、变频器、定量泵、减压阀、气路、定量注气针;具体结构为:氮气瓶内氮气由气管进入八氟环丁烷气瓶,为液态八氟环丁烷提供流入气路的压力;八氟环丁烷钢瓶通过气路与定量泵连接,当液态气体进入气路后通过变频器来控制电机来使定量泵工作,八氟环丁烷液体从定量泵出来后进入气路,通过减压阀来控制气路中的压力,当气泵吐出压力超过减压阀设定压力时,减压阀自动注出液态气体;气体在气路中一直是液态形式,只有经过最后一节管路时由液态转化为气态,再由定量注气针注入挤塑机,同样溶解于熔融状态的聚乙烯发泡料中,形成微细的泡孔结构。A dual-channel gas injection system for physical foaming process and a gas injection method thereof, characterized in that an additional octafluorocyclobutane gas injection device is additionally added under the condition of the original gas injection device; The cyclobutane gas injection system includes a nitrogen gas cylinder, an octafluorocyclobutane gas cylinder, a gas pipe, a frequency converter, a quantitative pump, a pressure reducing valve, a gas path, and a quantitative gas injection needle; the specific structure is: nitrogen gas enters the gas pipe from the gas pipe An octafluorocyclobutane gas cylinder provides a pressure for the liquid octafluorocyclobutane to flow into the gas path; the octafluorocyclobutane cylinder is connected to the metering pump through the gas path, and the liquid gas enters the gas path to control the motor through the frequency converter. The dosing pump is operated, and the octafluorocyclobutane liquid enters the gas path from the quantitative pump, and the pressure in the gas path is controlled by the pressure reducing valve. When the gas pump discharge pressure exceeds the set pressure of the pressure reducing valve, the pressure reducing valve is automatically injected. a liquid gas; the gas is always in a liquid form in the gas path, and is converted from a liquid state to a gaseous state only after passing through the last section of the pipeline, and then injected into the extruder by a quantitative gas injection needle, and is also dissolved in a molten polyethylene foam material. Medium, forming fine cells Structure.
本发明涉及的是一种用于物理发泡过程的双路注气系统及其注气方法,独立的 八氟环丁烷注气装置可根据需要使用,适用于射频电缆、漏泄电缆的物理发泡绝缘生产过程,该装置采用二氧化碳和八氟环丁烷两种气体双路注气,不仅能使缆芯的发泡度达到要求,而且保证了泡孔的细密性、均匀性和一致性,大大提高产品的性能。包括氮气气瓶、八氟环丁烷气瓶、气管、变频器、定量泵、减压阀、气路、定量注气针;定量泵通过设定变频器频率控制气体流量,进入挤塑机的气体流量可调节;八氟环丁烷在气路中以液态形式存在,直至液态气体经过气路到达最后一节管路转化为气态,再由气针注入挤塑机,与熔化状态的发泡料融合进行发泡过程。 The invention relates to a dual gas injection system for physical foaming process and a gas injection method thereof, independent The octafluorocyclobutane gas injection device can be used according to the requirements, and is suitable for the physical foam insulation production process of the radio frequency cable and the leaky cable. The device adopts two-way gas injection of carbon dioxide and octafluorocyclobutane, which can not only enable the cable. The degree of foaming of the core meets the requirements, and the fineness, uniformity and consistency of the cells are ensured, and the performance of the product is greatly improved. Including nitrogen gas cylinder, octafluorocyclobutane gas cylinder, gas pipe, frequency converter, quantitative pump, pressure reducing valve, gas path, quantitative gas injection needle; the quantitative pump controls the gas flow rate by setting the frequency of the frequency converter, and enters the extruder The gas flow rate can be adjusted; octafluorocyclobutane exists in a liquid form in the gas path until the liquid gas passes through the gas path to the last section of the pipeline to be converted into a gaseous state, and then injected into the extruder by the gas needle, and foamed in a molten state. The material is fused to carry out the foaming process.

Claims (3)

  1. 一种用于物理发泡过程的双路注气系统,其特征在于:包括二氧化碳注气装置和八氟环丁烷注气装置两部分;A dual gas injection system for a physical foaming process, comprising: a carbon dioxide gas injection device and an octafluorocyclobutane gas injection device;
    二氧化碳注气装置包括定量注气针、气路、注气机和气瓶;气瓶与气管连接后接注气机,注气机储气至设定压力再由气管接定量注气针将设定压力的气体注入挤塑机,溶解于熔融状态的聚乙烯发泡料中,形成微细的泡孔结构;The carbon dioxide gas injection device includes a quantitative gas injection needle, a gas path, a gas injection machine and a gas cylinder; the gas cylinder is connected with the gas pipe and then connected to the gas injection machine, and the gas injection machine stores the gas to the set pressure, and then the gas injection pipe is connected to the gas injection needle to set the gas injection needle. The pressurized gas is injected into the extruder and dissolved in the molten polyethylene foam to form a fine cell structure;
    八氟环丁烷注气装置包括氮气气瓶、八氟环丁烷气瓶、气管、变频器、定量泵、减压阀、气路和定量注气针;氮气瓶内氮气由气管进入八氟环丁烷气瓶,为液态八氟环丁烷提供流入气路的压力;当液态气体进入气路后通过变频器来控制电机来使定量泵工作,通过减压阀来控制气路中的压力,当气泵吐出压力超过减压阀设定压力时,减压阀自动注出液态气体;液态气体经过最后一节管路由液态转化为气态,再由定量注气针注入挤塑机,同样溶解于熔融状态的聚乙烯发泡料中,形成微细的泡孔结构。The octafluorocyclobutane gas injection device includes a nitrogen gas cylinder, an octafluorocyclobutane gas cylinder, a gas pipe, a frequency converter, a quantitative pump, a pressure reducing valve, a gas path and a quantitative gas injection needle; the nitrogen gas in the nitrogen bottle enters the octafluorocarbon from the gas pipe A cyclobutane gas cylinder provides a pressure for the liquid octafluorocyclobutane to flow into the gas path; when the liquid gas enters the gas path, the motor is controlled by the frequency converter to operate the metering pump, and the pressure in the gas path is controlled by the pressure reducing valve When the pump discharge pressure exceeds the set pressure of the pressure reducing valve, the pressure reducing valve automatically injects the liquid gas; the liquid gas is converted into a gaseous state through the last tube routing liquid, and then injected into the extruder by the quantitative gas injection needle, which is also dissolved in In the molten polyethylene foam, a fine cell structure is formed.
  2. 根据权利要求1所述一种用于物理发泡过程的双路注气系统,其特征在于:当定量泵吐出压力超过减压阀设定压力时,减压阀自动注出液态气体,保证注入挤塑机的气体量稳定。A dual gas injection system for a physical foaming process according to claim 1, wherein when the pressure of the metering pump exceeds the set pressure of the pressure reducing valve, the pressure reducing valve automatically injects the liquid gas to ensure injection. The amount of gas in the extruder is stable.
  3. 权利要求1所述的一种用于物理发泡过程的双路注气系统的注气方法,其特征在于:A gas injection method for a dual gas injection system for a physical foaming process according to claim 1, wherein:
    一种用于物理发泡过程的双路注气系统由二氧化碳注气系统和八氟环丁烷注气系统配合使用,二氧化碳和八氟环丁烷分两路注气注入挤塑机,在挤塑机转动之前,双路注气装置先打开,防止发泡料将定量注气针堵塞;为了增加二氧化碳的溶解度,机筒注气段的压力一般保持在200bar以上,而注气压力则需超过注入段机膛压力,二氧化碳注气压力一般控制在250-350bar之间,而八氟环丁烷注气压力换算成流量大约保持在150-240ml/min之间;挤塑机打开后, 融融状态的发泡料到达二氧化碳和八氟环丁烷注气处,二氧化碳气体与之融合,达到发泡效果,而在八氟环丁烷作用下,两者融合的更加细密、均匀,在达到高发泡度的同时,保证泡孔与泡孔间不产生破裂,既在减少发泡料使用的同时,又提高了缆芯的性能。 A dual gas injection system for physical foaming process is used by a carbon dioxide gas injection system and an octafluorocyclobutane gas injection system, and carbon dioxide and octafluorocyclobutane are injected into the extruder in two ways. Before the press rotates, the dual gas injection device is first opened to prevent the foaming material from clogging the quantitative gas injection needle; in order to increase the solubility of carbon dioxide, the pressure of the gas injection section of the barrel is generally maintained above 200 bar, and the gas injection pressure needs to be exceeded. Injecting the section pressure, the carbon dioxide injection pressure is generally controlled between 250-350 bar, and the octafluorocyclobutane gas injection pressure is converted into a flow rate of about 150-240 ml/min; after the extruder is opened, The foamed material in the molten state reaches the carbon dioxide and octafluorocyclobutane gas injection, and the carbon dioxide gas is fused with it to achieve the foaming effect, and under the action of octafluorocyclobutane, the fusion of the two is more fine and uniform, and reaches At the same time of high foaming degree, it ensures that there is no crack between the cells and the cells, which not only reduces the use of the foaming material, but also improves the performance of the cable core.
PCT/CN2015/083430 2014-11-18 2015-07-07 Dual-path gas injection system used for physical foaming process, and gas injection method for dual-path gas injection system WO2016078427A1 (en)

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