WO2016107004A1 - 高光钢琴黑镜面注塑方法及其注塑*** - Google Patents

高光钢琴黑镜面注塑方法及其注塑*** Download PDF

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Publication number
WO2016107004A1
WO2016107004A1 PCT/CN2015/076232 CN2015076232W WO2016107004A1 WO 2016107004 A1 WO2016107004 A1 WO 2016107004A1 CN 2015076232 W CN2015076232 W CN 2015076232W WO 2016107004 A1 WO2016107004 A1 WO 2016107004A1
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injection molding
mirror
mold
piano black
screw
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PCT/CN2015/076232
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English (en)
French (fr)
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黄军元
张宇
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四维尔丸井(广州)汽车零部件有限公司
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Publication of WO2016107004A1 publication Critical patent/WO2016107004A1/zh

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/76—Measuring, controlling or regulating

Definitions

  • the invention relates to the field of injection molding and painting technology, in particular to a high-gloss piano black mirror surface injection molding method and an injection molding system thereof.
  • the grille trim strip is the main part of the front face of the decorative car.
  • the decorative strip design style and the official sample lay the foundation of the whole car.
  • Each main engine factory design incorporates its own family elements.
  • the appearance of the grille trim strips tends to be high-light effect, and the apparent luster is easy to catch people's attention, but the cost of high-gloss spray paint is high, which affects the surrounding environment and water resources, and the pass rate is low. The more you don't get the favor from the OEM.
  • the injection molding process in the prior art is complicated and complicated, and the injection molding effect is poor, as shown in FIG.
  • a high-gloss piano black mirror injection molding method comprising the following steps:
  • the PMMA high-gloss piano black plastic particles are dried and melted, and the melted PMMA high-gloss piano black plastic is injected into the mirror cavity mold by the injection molding machine through a screw, and the heating device heats the front mold and the rear mold of the mirror cavity of the mold, so that PMMA The high-gloss piano is molded in black plastic, and then solidified by a cooling system, and dried by a drying device to form a product.
  • the mold is designed to simulate the product injection molding to produce an appearance and size by Moldflow mold flow software.
  • the screw of the screw injection molding machine has a temperature in the range of 240 ° C to 250 ° C.
  • the mirror cavity of the mold has a front mold temperature of 80 ° C and a rear mold temperature of 70 ° C.
  • the drying apparatus has a drying temperature of 90 ° C and a drying duration of 4 hours.
  • Another object of the present invention is to provide a high-gloss piano black mirror injection molding system.
  • a high-gloss piano black mirror injection molding system comprising an injection molding machine, a heating device, a drying device, a cooling system, a screw and a mold having a mirror cavity, the injection port of the injection molding machine is oriented toward the screw, and the screw is connected to The mirror cavity of the mold, the heating device and the cooling system are all connected to a mirror cavity of the mold.
  • the injection molding machine has a servo or electric drive screw.
  • the heating device is two oil temperature machines, and the two oil temperature machines are respectively located at the front and rear mold positions of the mirror cavity of the mold.
  • the hot runner of the mold employs a stable productive monolithic hot runner.
  • the drying device is a circulating dehumidifying drying device.
  • the invention relates to a black mirror surface injection molding method for a high-gloss piano.
  • the PMMA high-gloss piano black plastic particles are dried and melted, and the melted PMMA high-gloss piano black plastic is injected into the mirror cavity mold by an injection molding machine through a screw, and the heating device has a mirror type of the mold.
  • the front mold and the rear mold of the cavity are heated, so that the PMMA high-gloss piano is formed of black plastic, and then solidified by a cooling system, and dried by a drying device to form a product.
  • the invention relates to a high-gloss piano black mirror surface injection molding method, and the PMMA high-gloss piano black mirror surface material direct injection molding replaces the traditional injection molding and re-spraying technology, which can overcome the defects of high spraying cost, environmental protection and difficulty in recycling, realizes reduction of production cost and is environmentally sustainable. Development requirements.
  • the invention relates to a high-gloss piano black mirror surface injection molding method, and the obtained product has the appearance of a high-gloss piano black mirror surface color effect.
  • An injection molding process achieves the high-gloss effect after traditional injection molding, which greatly reduces the coating cost and production cost, that is, environmental protection, energy saving and consumption reduction.
  • the new process does not pollute the surrounding environment and water resources, and is low-carbon and environmentally friendly.
  • FIG. 2 is a process flow diagram of a high-gloss piano black mirror injection molding system according to an embodiment of the present invention
  • FIG. 3 is a schematic view of a black mirror injection molding system of a high-gloss piano according to an embodiment of the present invention.
  • the embodiment provides a high-gloss piano black mirror injection molding system, including an injection molding machine 200, a heating device, a drying device, a cooling system 600, a screw 300, and a mold having a mirror cavity 100, which has a servo or electric drive.
  • a screw 300 the injection port of the injection molding machine 200 faces the screw 300, the screw 300 communicates with the mirror cavity 100 of the mold, and the heating device and the cooling system 600 are connected to the The mirror cavity 100 of the mold.
  • the heating device is two oil temperature machines 400, and the two oil temperature machines 400 are respectively located at the front and rear mold positions of the mirror cavity 100 of the mold.
  • the hot runner of the mold employs a stable productive integral hot runner.
  • the drying device is a circulating dehumidifying drying device 500.
  • Moldflow Molding Software is used in the mold design to analyze the product injection molding is likely to produce appearance, size problems, and optimize the design to prevent product injection defects in advance.
  • Mold cavity material must be suitable for mirror polishing requirements. In this embodiment, Sweden Yishengbai S136H steel with excellent mirror polishing performance is selected. The cavity is first polished to 2000# with sandpaper, and the diamond paste is polished to a mirror surface.
  • the mold cutting process uses high-precision five-axis CNC machining equipment.
  • the cutting precision of the cavity surface is 0.005.
  • the cavity flatness should be evaluated and approved by the quality personnel before being polished.
  • the mold hot runner adopts the most stable and productive integral hot runner.
  • the embodiment further provides a high-gloss piano black mirror surface injection molding method, comprising the following steps:
  • Moldflow mold flow software is used to simulate and analyze the product appearance and size after injection molding, and the design is optimized to prevent injection molding defects.
  • the cavity gloss of the mold must be a mirror surface to form a mirror cavity 100.
  • the PMMA high-gloss piano black plastic particles are dried and melted, and the melted PMMA high-gloss piano black plastic is injected into the mirror cavity 100 mold by the injection molding machine 200 through the screw 300, and the heating device pairs the front and rear molds of the mirror cavity 100 of the mold. Heating, the PMMA high-gloss piano is molded into black plastic, and then solidified by a cooling system 600, and dried by a drying device to form a product.
  • the screw 300 of the screw 300 injection molding machine 200 has a temperature in the range of 240 ° C to 250 ° C. If the temperature is too high, the material will be carbonized. If the temperature is too low, the flow will be poor and the weld line will be obvious, resulting in poor appearance.
  • the front mold temperature of the mirror cavity 100 of the mold was 80 ° C, and the rear mold temperature was 70 ° C.
  • the drying equipment was dried at a temperature of 90 ° C and the drying duration was 4 hours.
  • the molded article was baked and tempered at 50 ° C for 2 minutes. After the injection molding process, the products can be assembled after inspection.
  • PMMA high-gloss piano black plastic particles have superior fluidity, can be shaped into large and small products, and the material color should have good visual impact.
  • PMMA high-gloss products meet 13 experimental requirements for impact and chemical resistance testing required by Hyundai SPEC7112Z-T5A-9000.
  • the injection molding machine 200 selects the imported small screw 300 driven by servo or electric motor. Due to the high light characteristic, two large oil temperature machines 400 are required to heat to achieve different high temperature differences between the front and rear molds, and the production workshop requires a dust-free constant temperature. Highlight zero When transporting parts, the conveyor belt should be used to avoid contamination of the surface when personnel pick up parts.
  • the invention relates to a production workshop of a high-gloss piano black mirror surface injection molding product at three points:
  • the conveyor belt When transporting high-gloss parts, the conveyor belt should be used to avoid contamination of the surface when personnel pick up parts.
  • Laser cutting is required when cutting the residual material to prevent dust from contaminating the surface of the part.
  • the invention relates to the inspection requirements of the product of the high-gloss piano black mirror surface injection molding:
  • a standard lighting room shall be established for inspection of appearance defects, and the light intensity shall be greater than 3000 LUX.
  • the product is cracked.
  • the injection test piece should be inspected and tested for stress in each batch.
  • the method is: 0.1N NaOH and 0.1N H 2 SO 4 smear. After standing for two hours, confirm whether the product is cracked at the weld line.
  • the high-gloss piano black mirror surface injection method of the invention relates to drying and melting the PMMA high-gloss piano black plastic particles, and the melted PMMA high-gloss piano black plastic is injected into the mirror cavity 100 mold by the injection molding machine 200 through the screw 300, and the heating device is used for the mold.
  • the front mold and the rear mold of the mirror cavity 100 are heated, so that the PMMA high-gloss piano is formed of black plastic, and then solidified by the cooling system 600, and dried by a drying device to form a product.
  • the invention relates to a high-gloss piano black mirror surface injection molding method, and the PMMA high-gloss piano black mirror surface material direct injection molding replaces the traditional injection molding and re-spraying technology, which can overcome the defects of high spraying cost, environmental protection and difficulty in recycling, realizes reduction of production cost and is environmentally sustainable. Development requirements.
  • the invention relates to a high-gloss piano black mirror surface injection molding method, and the obtained product has the appearance of a high-gloss piano black mirror surface color effect.
  • An injection molding process achieves the high-gloss effect after traditional injection molding, which greatly reduces the coating cost and production cost, that is, environmental protection, energy saving and consumption reduction.
  • the new process does not pollute the surrounding environment and water resources, and is low-carbon and environmentally friendly.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

本发明公开一种高光钢琴黑镜面注塑方法及其***，高光钢琴黑镜面注塑方法包括如下步骤：将PMMA高光钢琴黑塑料粒子干燥后熔融，熔融后的PMMA高光钢琴黑塑料由注塑机通过螺杆注射到具有镜面型腔的模具中成型，再经过冷却***固化后成型制品。高光钢琴黑镜面注塑***，包括注塑机、加热装置、干燥装置、冷却***及具有镜面型腔的模具，所述注塑机的注料口朝向于所述螺杆，所述螺杆连通于所述模具的镜面型腔，所述加热装置、冷却***均连接于所述模具的镜面型腔。本发明涉及的高光钢琴黑镜面注塑方法，能够克服喷涂成本高，不环保，难回收的缺陷，实现降低生产成本又环保可持续发展要求。

Description

高光钢琴黑镜面注塑方法及其注塑*** 技术领域
本发明涉及注塑、涂装技术领域，特别是涉一种高光钢琴黑镜面注塑方法及其注塑***。
背景技术
格栅装饰条是装饰车前脸主要部件，装饰条造型设计风格和仕样奠定整车基调，每个主机厂设计都融入各自家族元素。但是各主机厂对格栅装饰条外观逐步趋向于高光效果，其显目的光泽很容易夺人眼球，但是高光喷涂油漆的成本较高，又影响周边环境及水资源，并且合格率又低，越来越不受到主机厂青睐。现有技术中的注塑工艺复杂繁琐，且注塑效果差，参见图1所示。
发明内容
基于此，有必要提供一种能够克服喷涂成本高，不环保，难回收的缺陷，实现降低生产成本又环保可持续发展要求的高光钢琴黑镜面注塑方法。
一种高光钢琴黑镜面注塑方法，包括如下步骤：
将PMMA高光钢琴黑塑料粒子干燥后熔融，熔融后的PMMA高光钢琴黑塑料由注塑机通过螺杆注射到镜面型腔模具中，加热装置对模具的镜面型腔的前模及后模加热，使得PMMA高光钢琴黑塑料成型，再经过冷却***固化，经干燥设备干燥后成型制品。
在其中一个实施例中，所述模具在设计时，通过Moldflow模流软件模拟分析产品注塑产生外观、尺寸。
在其中一个实施例中，所述螺杆注塑机的螺杆的温度范围为240℃-250℃。
在其中一个实施例中，所述模具的镜面型腔的前模模温为80℃，后模模温为70℃。
在其中一个实施例中，干燥设备干燥温度为90℃，干燥持续时间为4小时。
本发明的另一目的在于提供一种高光钢琴黑镜面注塑***。
一种高光钢琴黑镜面注塑***，包括注塑机、加热装置、干燥装置、冷却***、螺杆及具有镜面型腔的模具，所述注塑机的注料口朝向于所述螺杆，所述螺杆连通于所述模具的镜面型腔，所述所述加热装置、冷却***均连接于所述模具的镜面型腔。
在其中一个实施例中，所述注塑机具有伺服或电动驱动的螺杆。
在其中一个实施例中，所述加热装置为两个油温机，两个油温机分别位于所述模具的镜面型腔的前模及后模位置。
在其中一个实施例中，所述模具的热流道采用稳定生产性整体式热流道。
在其中一个实施例中，所述干燥装置为循环除湿干燥设备。
本发明涉及的高光钢琴黑镜面注塑方法，将PMMA高光钢琴黑塑料粒子干燥后熔融，熔融后的PMMA高光钢琴黑塑料由注塑机通过螺杆注射到镜面型腔模具中，加热装置对模具的镜面型腔的前模及后模加热，使得PMMA高光钢琴黑塑料成型，再经过冷却***固化，经干燥设备干燥后成型制品。本发明涉及的高光钢琴黑镜面注塑方法，PMMA高光钢琴黑镜面材料直接注塑取代传统注塑后再喷涂技术，其能够克服喷涂成本高，不环保，难回收的缺陷，实现降低生产成本又环保可持续发展要求。
本发明涉及的高光钢琴黑镜面注塑方法，得到的产品的外观达到高光钢琴黑镜面色泽效果。一道注塑工艺达到传统注塑后再喷涂高光效果，极大的降低涂料成本和生产成本，即环保又节能减耗。
本发明涉及的高光钢琴黑镜面注塑方法，具有如下有益效果：
⑴制品通过高光材料直接注塑成型工艺外观达到高光钢琴黑镜面色泽效果，取代传统注塑后再涂装工艺，极大的降低涂料成本和生产成本，节能减耗。
⑵高光钢琴黑镜面PMMA材料，其本身透明特征对光没有遮蔽性，色粉黑颜色全部显示出来，色泽感更强突出黑又亮特点。
⑶高光钢琴黑镜面PMMA制品具备杰出的耐候性。
⑷新工艺对周边环境及水资源没有任何污染，低碳环保。
附图说明
图1为现有技术中的注塑工艺流程图；
图2为本发明实施例高光钢琴黑镜面注塑***的工艺流程图；
图3为本发明实施例高光钢琴黑镜面注塑***示意图。
附图标记说明
100、镜面型腔；200、注塑机；300、螺杆；400、油温机；500、循环除湿干燥设备；600、冷却***。
具体实施方式
为了便于理解本发明，下面将参照相关附图对本发明进行更全面的描述。附图中给出了本发明的较佳实施例。但是，本发明可以以许多不同的形式来实现，并不限于本文所描述的实施例。相反地，提供这些实施例的目的是使对本发明的公开内容的理解更加透彻全面。
需要说明的是，当元件被称为“固定于”另一个元件，它可以直接在另一个元件上或者也可以存在居中的元件。当一个元件被认为是“连接”另一个元件，它可以是直接连接到另一个元件或者可能同时存在居中元件。
除非另有定义，本文所使用的所有的技术和科学术语与属于本发明的技术领域的技术人员通常理解的含义相同。本文中在本发明的说明书中所使用的术语只是为了描述具体的实施例的目的，不是旨在于限制本发明。本文所使用的术语“和/或”包括一个或多个相关的所列项目的任意的和所有的组合。
本实施例提供了一种高光钢琴黑镜面注塑***，包括注塑机200、加热装置、干燥装置、冷却***600、螺杆300及具有镜面型腔100的模具，所述注塑机200具有伺服或电动驱动的螺杆300，所述注塑机200的注料口朝向于所述螺杆300，所述螺杆300连通于所述模具的镜面型腔100，所述所述加热装置、冷却***600均连接于所述模具的镜面型腔100。
所述加热装置为两个油温机400，两个油温机400分别位于所述模具的镜面型腔100的前模及后模位置。所述模具的热流道采用稳定生产性整体式热流道。所述干燥装置为循环除湿干燥设备500。
本实施例的制品模具4点要求：
①.模具设计时充分运用Moldflow模流软件分析产品注塑是可能产生外观，尺寸问题，优化设计提前预防产品注塑缺陷。
②.模具型腔材料必须适用于镜面抛光要求，本实施例选取具有优良镜面抛光性能的瑞典一胜百S136H钢材。型腔先逐级用砂纸抛光到2000#，再钻石膏抛光成镜面。
③.模具切削加工使用高精五轴CNC加工设备，型腔面的切削加工精度为0.005，型腔平整度要先得到品质人员评价认可、承认后再进行抛光。
④.模具热流道采用最稳定生产性整体式热流道。
本实施例还提供了一种高光钢琴黑镜面注塑方法，包括如下步骤：
参见图2所示，通过Moldflow模流软件模拟分析产品注塑产生外观、尺寸后设计模具，优化设计提前预防产品注塑缺陷。模具的型腔光泽度必须是镜面，形成镜面型腔100。
将PMMA高光钢琴黑塑料粒子干燥后熔融，熔融后的PMMA高光钢琴黑塑料由注塑机200通过螺杆300注射到镜面型腔100模具中，加热装置对模具的镜面型腔100的前模及后模加热，使得PMMA高光钢琴黑塑料成型，再经过冷却***600固化，经干燥设备干燥后成型制品。所述螺杆300注塑机200的螺杆300的温度范围为240℃-250℃。温度太高材料会碳化，温度过低会导致流动不良、熔接线明显，导致外观不良。所述模具的镜面型腔100的前模模温为80℃，后模模温为70℃。干燥设备干燥温度为90℃，干燥持续时间为4小时。为了避免应力开裂，成型制品要经过2分钟50℃的烘烤回火。注塑工艺完毕后的制品经过检查后即可进行组装。
其中，PMMA高光钢琴黑塑料粒子其物性具备优越流动性，可以成型大小制品，材料色泽要具备良好视觉冲击效果。PMMA高光制品满足本田SPEC7112Z-T5A-9000要求的耐冲击和耐化学品测试等13项实验要求。
注塑机200选用伺服或电动驱动的进口小螺杆300，由于高光特性需要两台大型油温机400加热实现前后模不同高温差，生产车间要求无尘恒温。高光零 件运输时，应选用传送带方式尽可能避免人员取件时污染表面。
制品标准样件上没有变形，缩水，破损，熔接线等影响镜面格栅之类的外观不良缺陷。另外色泽均匀，高光漆黑必须满足。
本发明涉及的高光钢琴黑镜面注塑制品的生产车间3点要求：
①须建立无尘恒温注塑车间。
②高光零件运输时，应选用传送带方式，尽可能避免人员取件时污染表面。
③切割余料时需要使用激光切割，避免粉尘污染零件表面。
本发明涉及的高光钢琴黑镜面注塑的制品检验要求：
①须建立起标准灯光房用于检查外观缺陷，灯光强度需大于3000LUX。
②为了避免应力集中，导致产品开裂，注塑件每批次要抽检检验应力，方法为：0.1N NaOH及0.1N H2SO4涂抹，放置两小时后确认熔接线处，产品是否有开裂。
本发明涉及的高光钢琴黑镜面注塑方法，将PMMA高光钢琴黑塑料粒子干燥后熔融，熔融后的PMMA高光钢琴黑塑料由注塑机200通过螺杆300注射到镜面型腔100模具中，加热装置对模具的镜面型腔100的前模及后模加热，使得PMMA高光钢琴黑塑料成型，再经过冷却***600固化，经干燥设备干燥后成型制品。本发明涉及的高光钢琴黑镜面注塑方法，PMMA高光钢琴黑镜面材料直接注塑取代传统注塑后再喷涂技术，其能够克服喷涂成本高，不环保，难回收的缺陷，实现降低生产成本又环保可持续发展要求。
本发明涉及的高光钢琴黑镜面注塑方法，得到的产品的外观达到高光钢琴黑镜面色泽效果。一道注塑工艺达到传统注塑后再喷涂高光效果，极大的降低涂料成本和生产成本，即环保又节能减耗。
本发明涉及的高光钢琴黑镜面注塑方法，具有如下有益效果：
⑴制品通过高光材料直接注塑成型工艺外观达到高光钢琴黑镜面色泽效果，取代传统注塑后再涂装工艺，极大的降低涂料成本和生产成本，节能减耗。
⑵高光钢琴黑镜面PMMA材料，其本身透明特征对光没有遮蔽性，色粉黑颜色全部显示出来，色泽感更强突出黑又亮特点。
⑶高光钢琴黑镜面PMMA制品具备杰出的耐候性。
⑷新工艺对周边环境及水资源没有任何污染，低碳环保。
以上所述实施例仅表达了本发明的几种实施方式，其描述较为具体和详细，但并不能因此而理解为对本发明专利范围的限制。应当指出的是，对于本领域的普通技术人员来说，在不脱离本发明构思的前提下，还可以做出若干变形和改进，这些都属于本发明的保护范围。因此，本发明专利的保护范围应以所附权利要求为准。

Claims (10)

  1. 一种高光钢琴黑镜面注塑方法，其特征在于，包括如下步骤：
    将PMMA高光钢琴黑塑料粒子干燥后熔融，熔融后的PMMA高光钢琴黑塑料由注塑机通过螺杆注射到具有镜面型腔的模具中；
    加热装置对模具镜面型腔的前模及后模加热，使得PMMA高光钢琴黑塑料成型，再经过冷却***固化，经干燥设备干燥后成型制品。
  2. 根据权利要求1所述的高光钢琴黑镜面注塑方法，其特征在于，所述模具在设计时，通过Moldflow模流软件模拟分析产品注塑产生外观、尺寸。
  3. 根据权利要求1所述的高光钢琴黑镜面注塑方法，其特征在于，所述螺杆注塑机的螺杆的温度范围为240℃-250℃。
  4. 根据权利要求1-3任意一项所述的高光钢琴黑镜面注塑方法，其特征在于，所述模具的镜面型腔的前模模温为80℃，后模模温为70℃。
  5. 根据权利要求1-3任意一项所述的高光钢琴黑镜面注塑方法，其特征在于，干燥设备干燥温度为90℃，干燥持续时间为4小时。
  6. 一种高光钢琴黑镜面注塑***，其特征在于，包括注塑机、加热装置、干燥装置、冷却***、螺杆及具有镜面型腔的模具，所述注塑机的注料口朝向于所述螺杆，所述螺杆连通于所述模具的镜面型腔，所述所述加热装置、冷却***均连接于所述模具的镜面型腔。
  7. 根据权利要求6所述的高光钢琴黑镜面注塑***，其特征在于，所述注塑机具有伺服或电动驱动的螺杆。
  8. 根据权利要求6或7所述的高光钢琴黑镜面注塑***，其特征在于，所述加热装置为两个油温机，两个油温机分别位于所述模具的镜面型腔的前模及后模位置。
  9. 根据权利要求6或7所述的高光钢琴黑镜面注塑***，其特征在于，所述模具的热流道采用稳定生产性整体式热流道。
  10. 根据权利要求6或7所述的高光钢琴黑镜面注塑***，其特征在于，所述干燥装置为循环除湿干燥设备。
PCT/CN2015/076232 2014-12-31 2015-04-10 高光钢琴黑镜面注塑方法及其注塑*** WO2016107004A1 (zh)

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