WO2013060231A1 - 塑料瓶制造方法 - Google Patents

塑料瓶制造方法 Download PDF

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Publication number
WO2013060231A1
WO2013060231A1 PCT/CN2012/082680 CN2012082680W WO2013060231A1 WO 2013060231 A1 WO2013060231 A1 WO 2013060231A1 CN 2012082680 W CN2012082680 W CN 2012082680W WO 2013060231 A1 WO2013060231 A1 WO 2013060231A1
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bottle
cavity
plastic
blow
blow molding
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PCT/CN2012/082680
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English (en)
French (fr)
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苏健强
汪继忠
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珠海天威飞马打印耗材有限公司
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Publication of WO2013060231A1 publication Critical patent/WO2013060231A1/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
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/28—Blow-moulding apparatus
    • B29C49/30—Blow-moulding apparatus having movable moulds or mould parts
    • 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
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/07—Preforms or parisons characterised by their configuration
    • B29C2949/0715—Preforms or parisons characterised by their configuration the preform having one end closed
    • 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
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
    • B29C49/04—Extrusion blow-moulding
    • 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
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
    • B29C49/06—Injection blow-moulding
    • 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
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/76—Neck calibration
    • B29C49/761—Forming threads, e.g. shaping neck thread between blowing means and mould

Definitions

  • the present invention relates to a method of manufacturing a plastic bottle.
  • the present invention is based on a Chinese patent application filed on Oct. 29, 2011, filed on Jan. 29, 2011, the content of which is hereby incorporated by reference.
  • Chinese Patent Application Publication No. CN101670659A discloses a mold apparatus for injection-pulling plastic hollow container products and a process molding method thereof, the mold apparatus comprising an injection mold assembly, a blow mold assembly and a stretching device, and the process includes Injection molding process, blow molding process and stretching process, specifically: in the injection molding process, the movable mold and the fixed mold are closed, the mold is closed, the injection molding preform, the movable mold and the fixed mold are opened, and the mold is opened and then blown into the blow molding process, blowing The molding module is closed, the preform is simultaneously stretched and blow molded to form a hollow container, and then the stretching device is returned to the original position, and the blow molding module is opened to eject the formed hollow container.
  • hollow containers have to be matched with other parts during use.
  • plastic bottles used as hollow containers usually need to be matched with plastic covers to achieve the sealing of the inner space of the container.
  • the plastic produced by the blow molding method.
  • the bottle because the obtained plastic bottle mouth is of poor precision, the cooperation with the cap does not meet the sealing requirements, and can not meet the strict use requirements for sealing.
  • toner bottles are becoming more and more popular, and there is a tendency to replace other ways of adding toner packaging. It is more convenient to use toner bottles for powdering. . Because the toner can not be damp, it needs to be sealed and preserved, and the existing plastic bottles are mostly produced by the blow molding method. For the above reasons, the sealing requirements cannot be met.
  • the sealing method is usually to seal the bottle with a layer of aluminum film for sealing.
  • the use of this plastic bottle to package toner not only has a bottle cap, but also an additional process of welding aluminum film and the use of aluminum film material, it is difficult to open the aluminum film during use, and it is inconvenient to use.
  • An object of the present invention is to provide a method for manufacturing a plastic bottle which has high precision in forming a bottle mouth and is easy to achieve sealing with a bottle cap.
  • the technical solution adopted by the manufacturing method of the plastic bottle of the invention comprises: three steps of injection molding, blow molding and demoulding; and the first station, the bottle blank is accurately injection molded out of the bottle mouth portion and the bottle body is stretched to obtain The prefabricated bottle, the core and the prefabricated bottle are transferred to the second station; the second station is used to produce a plastic bottle by blow molding in a blow mold, the blow mold includes a non-blown cavity and a blow moldable The cavity has a shape and size corresponding to the mouth of the bottle, the bottle body is placed in the cavity, and after the blow molding is completed, the mold is transferred to the third station; at the third station, the mold is released.
  • PET plastic is resistant to creep, fatigue, friction and dimensional stability, it has low abrasion and high hardness, and is less affected by temperature, which makes the shape and size of the bottle part of the plastic bottle more stable.
  • the plastic bottle manufacturing method of the present invention adopts the above technical solution, the welding aluminum film process can be omitted, and the aluminum film material can be saved, compared with the sealing method of the welding sealing film.
  • Figure 1 is a schematic view of each station in the process of producing a plastic bottle
  • Figure 2 is a perspective view of the injection bottle mouth during the injection molding process
  • Figure 3 is a perspective view of the bottle body of the bottle with a bottle during the injection molding process
  • Figure 4 is a perspective view of a plastic bottle
  • Figure 5 is a cross-sectional view of a preformed bottle in a blow mold
  • Figure 6 is a partial cross-sectional view showing the combination of a plastic bottle and a bottle cap
  • Figure 7 is a partial cross-sectional view showing another combination of a plastic bottle and a cap.
  • the process used in the manufacturing method of the plastic bottle includes three steps of injection molding, blow molding, and demoulding.
  • the preform is first injection molded into the mouth portion, and the core is molded. Walking away from the mouth of the bottle, stretching the preformed bottle 1 with the bottle, then the core 4 is transferred to the second station 22 together with the preformed bottle 1; at the second station 22, in the blow mold 32
  • the plastic bottle is produced by the blow molding method, and finally transferred to the third station 23 to perform demolding, and after the workpiece is removed, the next cycle is performed.
  • the plastic bottle is made of PET plastic.
  • the preform is first injection molded into the nozzle portion 11 of a precise size.
  • the portion of the bottle body 12 in the preformed bottle is expanded to a predetermined size by a blow molding method to form a finished shape of the plastic bottle.
  • the blow mold 32 includes a non-blown cavity 321 and a blowable cavity 322.
  • the mouth portion 11 is adapted to the cavity 321 and the bottle mouth portion 11 of the pre-formed bottle is mounted in the mold.
  • the preformed bottle body 12 is placed in the cavity 322. Since the mouth portion 11 is adapted to the cavity 321, the cavity 321 is separated from the cavity 322 by the mouth portion 11, and the preform is bottled by blowing from the mandrel hole 41 of the core 4 into the bottle body 12.
  • the bottle body 12 is stretched and expanded to fill the cavity 322.
  • the mouth portion 11 Since the outlet of the mandrel hole 41 does not enter the mouth portion 11, even if the fluidity of the gas causes the gas to have a tendency to penetrate into the mouth portion 11, the mouth portion 11 The body has filled the cavity 321 and the mouth portion 11 is open, which does not have a closed wrapping effect on the gas, that is, the internal and external air pressure of the mouth portion 11 does not generate a pressure difference, so the shape of the mouth portion 11 and The size is not affected by the blow molding operation.
  • the mouth portion 11 together with the bottle body 12 constitutes a plastic bottle of a predetermined shape.
  • the high-precision bottle mouth portion 11 of the prepared plastic bottle is directly sealed with the cap 5 in a spiral fit.
  • the high precision mouth portion 11 of the finished plastic bottle is directly sealed with the cap 5 by an interference fit.
  • the mouth of the bottle is completely formed by injection molding in the injection mold. Because the dimensional accuracy of the product obtained by the injection molding method is high, the dimensional accuracy of the preformed bottle mouth obtained by the injection molding method is also high, and the blow mold is transferred to the second station.
  • the blow mold is closed, the bottle mouth portion of the pre-formed bottle is placed in the matching cavity, so that the dimensional accuracy of the bottle mouth portion is continuously ensured, and the bottle portion of the pre-formed bottle is in the cavity, the core
  • the shaft is blown in the bottle body, and the bottle body part of the prefabricated bottle is blow molded.
  • the mouth part is not affected by the blow molding operation, and the shape and size of the bottle mouth part are guaranteed by the mold, so the bottle mouth Part of the shape and size of the precision is guaranteed, and can be precisely matched with the cap to achieve sealing.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)

Abstract

一种塑料瓶制造方法，包括：注塑、吹塑、脱模三道工序；第一工位（21），将瓶坯料精确注塑出瓶嘴部分并对瓶体进行拉伸，得到预制瓶，模芯连同预制瓶转到第二工位（22）；第二工位（22），在吹塑模具中用吹塑的方法生产出塑料瓶，吹塑模具包括不可吹塑的容腔及可吹塑的空腔，容腔的形状尺寸与瓶嘴部分相适配，瓶身置于空腔中，吹塑完成后再转到第三工位（23）；在第三工位（23），进行脱模。本方法适用于生产瓶嘴成型精度高、便于与瓶盖实现密封要求的塑料瓶。

Description

塑料瓶制造方法
本发明涉及一种塑料瓶的制造方法。本发明基于申请日为2011年10月29日、申请号为201110335809.6的中国发明专利申请，该申请的内容作为与本发明密切相关的参考文献引入本文。
公开号为CN101670659A的中国专利申请公开了一种注拉吹塑料中空容器制品的模具设备及其工艺成型方法,该模具设备包括注塑模组件、吹塑模组件及拉伸装置，工艺过程包括注塑过程、吹塑过程及拉伸过程，具体是：注塑过程中，动模与定模合模，模具闭合，注塑瓶胚，动模与定模开模，模具开启后进入吹塑过程，吹塑成型模块闭合，将瓶胚同时进行拉伸、吹气成型形成中空容器，接着拉伸装置回复原位，开启吹塑成型模块将成型的中空容器顶出。有些中空容器在使用过程中是要与其他零件有配合要求的，例如作为中空容器的塑料瓶，通常需要与塑料盖配合，以实现对容器内部空间的密封，这种用吹塑方法生产的塑料瓶，因为得到的塑料瓶瓶嘴精度差，与瓶盖的配合达不到密封的要求，不能满足对于密封要求严格的使用场合。
碳粉瓶作为激光打印机、复印机等办公设备所补充的碳粉的包装方式之一，越来越受欢迎，有取代其他补充碳粉包装方式的趋势，使用碳粉瓶进行加粉时操作比较方便。因为碳粉不能受潮，需要密封保存，而现有碳粉瓶多使用吹塑方法生产的塑料瓶，由于前述原因不能满足密封要求，其密封方式通常是在瓶嘴焊接一层铝薄膜来进行密封，使用这种塑料瓶包装碳粉不但要有瓶盖，还多了一道焊接铝薄膜工序及多使用了铝薄膜材料，在使用时揭开铝薄膜又比较困难，使用不方便。
本发明的目的是提供一种瓶嘴成型精度高、便于与瓶盖实现密封要求的塑料瓶制造方法。
本发明的塑料瓶制造方法所采用的技术方案是：包括：注塑、吹塑、脱模三道工序；第一工位，将瓶坯料精确注塑出瓶嘴部分并对瓶体进行拉伸，得到预制瓶，模芯连同预制瓶转到第二工位；第二工位，在吹塑模具中用吹塑的方法生产出塑料瓶，吹塑模具包括不可吹塑的容腔及可吹塑的空腔，容腔的形状尺寸与瓶嘴部分相适配，瓶身置于空腔中，,吹塑完成后再转到第三工位；在第三工位，进行脱模。
进一步的技术方案是塑料瓶的材料是PET塑料。由于PET塑料耐蠕变、抗疲劳性、耐摩擦和尺寸稳定性好，磨耗小而硬度高，受温度影响小，使塑料瓶的瓶嘴部分的形状及尺寸更稳定。
由于本发明的塑料瓶制造方法采用了上述技术方案，较之于焊接封膜的密封方法，可以省去焊接铝薄膜工序，节省了铝薄膜材料。
图1是生产塑料瓶工艺流程中各工位示意图；
图2是注塑预制瓶过程中注塑瓶嘴的立体图；
图3是注塑预制瓶过程中注塑带瓶嘴的瓶身的立体图；
图4是塑料瓶的立体图；
图5是预制瓶在吹塑模具中的剖视图；
图6是塑料瓶与瓶盖结合的局部剖视图；
图7是塑料瓶与瓶盖另一种结合的局部剖视图。
下面结合附图和实施例对本发明进一步说明。
塑料瓶制造方法所采用工艺包括注塑、吹塑、脱模三个步骤，参见图1，在第一工位21，注塑模具31闭合后，首先将瓶坯料注塑出瓶嘴部分，并使模芯朝向远离瓶嘴部分的方向行走，拉伸出具有瓶体的预制瓶1，然后模芯4连同预制瓶1转到第二工位22；在第二工位22，在吹塑模具32中用吹塑的方法生产出塑料瓶，最后再转到第三工位23，进行脱模，将工件取下后，又进行下一个循环。塑料瓶的材料采用PET塑料。
参见图2，在注塑工序，首先将瓶坯料注塑出精确尺寸的瓶嘴部分11。
参见图3，在注塑工序，注塑出瓶嘴部分11部分的同时，还再继续将模芯往下走，拉伸出预制瓶1中的瓶身12部分。
参见图4，吹塑工序，将预制瓶中的瓶身12部分用吹塑的方法扩大到预定尺寸，则形成塑料瓶的成品形状。
参见图5，吹塑模具32包括不可吹塑的容腔321及可吹塑的空腔322，瓶嘴部分11与容腔321相适配，合模后预制瓶的瓶嘴部分11镶嵌在容腔321中，预制瓶的瓶身12置于空腔322中。由于瓶嘴部分11与容腔321相适配，使容腔321与空腔322被瓶嘴部分11相区隔，从模芯4的芯轴孔41往瓶身12内吹气，使预制瓶的瓶身12受到拉伸扩大至填满空腔322，由于芯轴孔41的出口不进入瓶嘴部分11，即使气体的流动性使得气体有渗进瓶嘴部分11的倾向，但瓶嘴部分11本体已将容腔321填满，而且瓶嘴部分11呈敞口，不会对气体产生密闭包裹效应，即瓶嘴部分11的内外气压不会产生压差，所以瓶嘴部分11的形状及尺寸不受吹塑操作的影响。瓶嘴部分11与瓶身12一起构成预定形状尺寸的塑料瓶。
参见图6，所制成的塑料瓶高精度的瓶嘴部分11与瓶盖5螺旋配合直接密封。
在另外的实施例中，参见图7，所制成的塑料瓶高精度的瓶嘴部分11与瓶盖5过盈配合直接密封。
瓶嘴在注塑模具中完全用注塑方法成型，因为由注塑方法所得的产品的尺寸精度高，所以由注塑方法所得的预制瓶瓶嘴的尺寸精度也高，转到第二工位的吹塑模具中时，吹塑模具合模后预制瓶的瓶嘴部分置于与之相适配容腔中，使瓶嘴部分的尺寸精度继续得到保证，而预制瓶的瓶身部分处于空腔中，芯轴在瓶身中吹气，将预制瓶的瓶身部分吹成型，在此工位，瓶嘴部分不受吹塑操作的影响，瓶嘴部分的形状及尺寸均由模具来保证，因此瓶嘴部分的形状及尺寸的精度得以保证，可以与瓶盖精密配合实现密封。

Claims (2)

  1. 塑料瓶制造方法，包括
    注塑、吹塑、脱模三道工序；
    其特征在于：
    第一工位，将瓶坯料精确注塑出瓶嘴部分并对瓶体进行拉伸，得到预制瓶，模芯连同所述预制瓶转到第二工位；
    第二工位，在吹塑模具中用吹塑的方法生产出塑料瓶，所述吹塑模具包括不可吹塑的容腔及可吹塑的空腔，所述容腔的形状尺寸与所述瓶嘴部分相适配，所述瓶身置于所述空腔中,吹塑完成后再转到第三工位；
    第三工位，进行脱模。
  2. 根据权利要求1所述的塑料瓶制造方法，其特征在于：所述塑料瓶的材料是PET塑料。
PCT/CN2012/082680 2011-10-29 2012-10-10 塑料瓶制造方法 WO2013060231A1 (zh)

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WO2024060295A1 (zh) * 2022-09-20 2024-03-28 湖南千山制药机械股份有限公司 塑料封装容器注吹镀灌封一体机

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