WO2012031434A1 - 一种注吹大容量塑料中空容器的模具设备及其工艺方法 - Google Patents

一种注吹大容量塑料中空容器的模具设备及其工艺方法 Download PDF

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Publication number
WO2012031434A1
WO2012031434A1 PCT/CN2010/079380 CN2010079380W WO2012031434A1 WO 2012031434 A1 WO2012031434 A1 WO 2012031434A1 CN 2010079380 W CN2010079380 W CN 2010079380W WO 2012031434 A1 WO2012031434 A1 WO 2012031434A1
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WO
WIPO (PCT)
Prior art keywords
mold
parison
blow molding
injection
blowing
Prior art date
Application number
PCT/CN2010/079380
Other languages
English (en)
French (fr)
Inventor
黄锦强
Original Assignee
台山市心华药用包装有限公司
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Application filed by 台山市心华药用包装有限公司 filed Critical 台山市心华药用包装有限公司
Publication of WO2012031434A1 publication Critical patent/WO2012031434A1/zh

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Classifications

    • 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
    • B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
    • B29C2049/023—Combined blow-moulding and manufacture of the preform or the parison using inherent heat of the preform, i.e. 1 step 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
    • B29C49/0665—Injection blow-moulding the injection mould cavity and the blow-mould cavity being displaceable to the geometrically fixed injection core mould
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/712—Containers; Packaging elements or accessories, Packages
    • B29L2031/7126—Containers; Packaging elements or accessories, Packages large, e.g. for bulk storage
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/712—Containers; Packaging elements or accessories, Packages
    • B29L2031/7158—Bottles

Definitions

  • the present invention relates to a mold apparatus for injection molding plastics, and more particularly to a mold apparatus for injecting a large-capacity plastic hollow container.
  • the present invention also relates to a process for applying a large-capacity plastic hollow container in a mold apparatus for blowing a large-capacity plastic hollow container.
  • the "extrusion-blow molding” method is basically used for production.
  • the specific process for making a large-sized plastic hollow container by this method is as follows: extrusion of a tubular type by a plastic extruder The material is then made into a large plastic container by a separate blow mold and blown air. The appearance of the product is cracked, not smooth, the bottle mouth and the bottom of the bottle are scrapped, uneven, the size of the bottle mouth is inaccurate, the sealing is poor, and the like. .
  • the Chinese invention patent No. CN95117243. 3 proposes a method of molding a large container by stretch blow molding, which is carried out by means of injection blowing. Achieve the production of large plastic containers.
  • the parison is injection molded on the injection molding machine, and the parison is taken out, moved to a preheating device to heat the parison to a predetermined temperature, and then placed in a blow mold to be blown into a large hollow plastic container.
  • the above method is a two-step processing method. The problem is that during the processing, the injection molding parison is large and has a certain temperature, and the material will sag during the moving process, which makes the movement difficult and the parison is easily deformed.
  • CN200810025749. 6 proposed a mold, single station injection, mold for blowing plastic hollow container molding products and its application, the mold can be applied to ordinary horizontal injection molding machine to realize one-step method, single station injection, blowing plastic hollow container .
  • the mold described in the patent comprises an injection mold assembly and a blow mold assembly, the injection mold assembly includes a movable mold and a fixed mold, and the movable mold and the fixed mold are respectively installed in the horizontal injection molding through the movable mold mounting plate and the fixed mold mounting plate.
  • the injection molding machine is provided with four support rails, the movable mold mounting plate is slidably mounted on the support rail, the fixed mold mounting plate is fixedly mounted on the support rail, and the movable mold is driven by the driving device to be laterally movable along the support rail.
  • An injection molding parison die is arranged on the fixed mold, and a parison forming mandrel with a blowing port and a hollow shape is arranged on the movable mold, and the parison forming core rod and the injection molding parison concave mold are matched and arranged, and the movable mold corresponds to
  • the parison forming mandrel is provided with a blow molding module comprising a two-side blow molding module and a pushing device that urges the blow molding module to move longitudinally.
  • the patented mold has many advantages and can be applied to an ordinary horizontal injection molding machine without special equipment, reducing equipment capital investment, and The surface of the finished product has no cracks, and at the same time, the product uniformity and strength are improved, the product quality is stable, and the one-step single-station production has high automation degree and high production efficiency.
  • its structure determines that it can only be applied to the production of small-capacity plastic hollow containers, and is not suitable for the production of large-capacity plastic hollow containers.
  • the main reasons are as follows: (1) Because the patented mold is used to produce small-capacity containers, its dynamic model The volume of the fixed mold is small, the lateral convex amount of the movable mold and the fixed mold is relatively small, and the centering deformation is small under the action of gravity.
  • the ordinary fixed structure can ensure the alignment alignment accuracy, but when the large-capacity plastic hollow is produced
  • the container mainly refers to a large-capacity plastic hollow container with a volume of 5 ⁇ 200 liters
  • the volume and weight of the movable mold are correspondingly increased, and the lateral convex amount is also large. Therefore, when the structure of the patent is adopted, the dynamic mold is used. Under the action of gravity, it will bend downward and the positioning will be inaccurate.
  • the blow molding module Since the patented mold is used to produce small-capacity containers, the blow molding module has relatively small volume and weight, and the blow molding module adopts a pushing device mounted on the movable mold to support positioning to ensure accurate positioning, and does not need Additional positioning device, if the production of large-capacity plastic hollow containers, the required volume and weight of the blow molding module will increase accordingly.
  • the blow molding modules on both sides will appear under the action of gravity. The phenomenon of lower offset, inaccurate positioning, unstable production, resulting in product deformation and high scrap rate.
  • An object of the present invention is to provide a mold apparatus for a large-capacity plastic hollow container by a one-step method, single-station injection, in view of the above-mentioned problems.
  • a mold device for injecting a large-capacity plastic hollow container comprising an injection molding machine guide rail, an injection mold assembly and a blow mold assembly, the injection mold assembly comprises a movable mold and a fixed mold which are arranged in parallel in the right and left center, and the movable mold is mounted and injection molded.
  • the fixed mold On the movable template of the machine, the fixed mold is fixed on the fixed template of the injection molding machine, the inner side of the movable mold is provided with a push plate movable horizontally to the left and right, and the outer side of the push plate is provided with a container including two container thread forming modules.
  • the movable mold is provided with a parison forming mandrel passing through a push plate and a container thread forming assembly
  • the parison forming mandrel is hollow and has a blowing port and a row with an exhaust gas regulator
  • a blow molding die assembly is disposed on both sides of the parison forming mandrel
  • the blow molding die assembly comprises two blow molding modules respectively located on two sides of the parison forming mandrel and is used for pushing a pushing device for opening and closing of the blow molding module
  • a support frame is arranged on both sides of the front end of the movable mold, and the support frame is slidably mounted on the guide rail of the injection molding machine
  • the blow molding die assembly is mounted on the support frame, and the two supports Horizontally parallel between shelves There are sliding guides and adjustable support rails for supporting the installation of two blow molding modules.
  • the adjustable support rail comprises two upper and lower two sets between the two support frames and supports two blow molding dies.
  • the rail rod of the block and an adjustment mechanism for adjusting the position of the rail rod is a fixed position of the rail rod.
  • the pushing device is a cylinder pushing device
  • the supporting frame is provided with a supporting hole for supporting the cylinder pushing device to push the blow molding module.
  • the mold apparatus of the present invention further includes a stretching mechanism, the stretching mechanism comprising a stretching rod disposed in the parison forming mandrel for axially stretching the parison, and a driving mechanism of the stretching rod, which can be in the injection
  • the pulling action is further increased during the blowing process, so that the one-step method, the injection-blowing large-capacity plastic hollow container can be realized.
  • Another object of the present invention is to provide a molding process for injecting a large-capacity plastic hollow container by the above-described mold apparatus.
  • the present invention adopts the following technical solution - a process for injecting a large-capacity plastic hollow container by using the above-mentioned mold equipment, the process includes an injection molding process and a blow molding process; in the injection molding process, moving the movable mold, moving mold and setting After the mold is closed, after molding, the injection molding parison, after the injection molding parison is cooled to the parting temperature, moves the moving mold backward, the moving mold and the fixed mold splitting, and then enters the blow molding process; during the blow molding process, the two blow molding The molding module is closed under the guiding action of the adjustable support rail, and then the parison forming core rod is blown into the parison.
  • the exhaust gas stabilizing device performs internal exhausting under the pressure required by the process to accelerate the parison.
  • Forming and cooling after the blow molding of the hollow container is completed, after opening the blow molding module, the pusher pushes the container thread forming assembly and the blow molding module to move axially together for a distance, and then simultaneously opens the container thread forming assembly and the blow molding module.
  • the formed hollow container is ejected.
  • the above mold apparatus further includes a stretching mechanism including a stretching rod disposed in the parison forming mandrel for axially stretching the parison and a driving mechanism of the stretching rod; In the process, the parison is stretched while blowing the parison.
  • a stretching mechanism including a stretching rod disposed in the parison forming mandrel for axially stretching the parison and a driving mechanism of the stretching rod; In the process, the parison is stretched while blowing the parison.
  • the parison forming mandrel moves synchronously with the moving mold, and the parison forming core rod is always fixed in the moving mold, the relative moving mold does not move, and the injection blank adheres.
  • the blow molding module is closed, the parison forming mandrel opens the blowing port to blow the air, the high pressure air enters the inside of the parison, and the exhaust voltage regulator performs timing.
  • the invention is directly applied to a common horizontal injection molding machine, and solves the technical problem that the existing mold equipment for producing a small-capacity plastic hollow container cannot be used for producing a large-capacity plastic hollow container due to structural defects, and supports a large capacity by increasing the support frame.
  • the large-scale heavy-duty moving mold and blow molding module of the hollow container constitute a scientific and reasonable rigid support.
  • the movable mold and the blow mold assembly have stable movement and accurate positioning, and the present invention does not require special equipment to realize one-step injection molding. Blow molding large-capacity plastic hollow containers, simplifying procedures and reducing equipment costs.
  • the mold equipment of the present invention is suitable for producing large-capacity plastic hollow containers, and the mold equipment has high production automation and high production effect.
  • the mold equipment of the invention realizes integration, single-station injection blowing or blowing and drawing large-capacity plastic hollow container molding products, so that the blanks are completed to the large-capacity hollow container, and the surface of the product has no cracks, which can effectively improve The uniformity of the plastic large-capacity hollow container and the strength of the product make the product quality more assured.
  • the exhaust gas pressure regulator performs internal exhaust cooling to accelerate the internal and external cooling shaping of the parison.
  • the mold device of the invention has compact structure, easy installation, simple operation and maintenance; the whole process is simple and easy to implement.
  • Fig. 1 is a cross-sectional view showing the structure of the present invention in the case of mold clamping.
  • Figure 2 is a perspective view showing the structure of the injection molding of the present invention.
  • Figure 3 is a cross-sectional view showing the structure of the present invention in the form of blow molding.
  • Fig. 4 is a perspective view showing the structure of the present invention in the form of blow molding.
  • Figure 5 is a cross-sectional view showing the structure of the mold opening of the present invention.
  • Fig. 6 is a perspective view showing the structure of the mold opening according to the present invention.
  • the mold apparatus for blowing a large-capacity plastic hollow container includes an injection molding machine guide 3, an injection mold assembly, and a blow mold assembly 4.
  • the injection mold assembly includes a movable mold 1 and a fixed mold 2 which are disposed in parallel in the right and left centering, and the movable mold 1 is mounted on the movable mold of the injection molding machine.
  • the fixed mold 2 is fixed on the fixed template 21 of the injection molding machine, and the movable mold 1 is driven to move left and right along the guide rail 3 of the injection molding machine by a set of driving means, thereby realizing the opening and closing of the movable mold 1 and the fixed mold 2.
  • the fixed mold 2 is provided with an injection parison die 22.
  • the movable mold 1 includes an air intake plate 12, a push plate 13, a container thread forming assembly 14, and a parison forming core rod 15.
  • the air inlet plate 12 is fixed on the movable platen 11 and communicates with a cylinder;
  • the air intake plate 12 is mounted with a parison forming core rod 15, and
  • the parison forming core rod 15 is hollow and has a blowing port and Exhaust port with exhaust regulator, and cylinder with intake plate 12
  • the parison forming mandrel 15 cooperates with the injection parison die 22 to form an injection molding cavity.
  • the outer side of the air inlet plate 12 (or the inner side surface of the movable mold) is provided with a push plate 13 movable horizontally to the left and right, and the outer side surface of the push plate is provided with a container thread forming assembly 14, which includes two containers.
  • the thread forming module 141 and the opening and closing cylinder 142 for driving the side container thread forming module 141 to open and close, the parison forming mandrel 15 passing through the push plate 13 and the container thread forming assembly 14, the outer side of the container thread forming module assembly 14
  • the blow molding module assembly 4 is disposed outside the parison forming mandrel 15.
  • the blow molding module assembly 4 includes two blow molding modules 41 respectively located on both sides of the parison forming core rod 15 and a pushing device for pushing the opening and closing of the blow molding module, and the pushing device is specifically a cylinder pushing device 42.
  • the front end of the movable mold is provided with a support frame. 5, and the support frame 5 is slidably mounted on the support rail 3, the support frame 5 and the movable mold 1 can be synchronously moved along the support rail 3, and the support frame 5 functions to support the movable mold 1, and the movable mold 1 is moved.
  • the movable mold 1 required for the production of large-capacity plastic hollow containers will be unstable due to the heavy weight, and the moving mold 1 will be easily damaged. Moreover, the movable mold 1 will be deformed by gravity, and the clamping position and the centering deviation are large.
  • the weight of the blow molding die assembly 4 is correspondingly increased, in order to ensure a stable and stable structure of the blow molding die assembly 4 and two blow moldings.
  • the molding module 41 is smoothly aligned, and the above-mentioned blow molding module 4 is mounted on the support frame 5.
  • the slide rails 6 for supporting and mounting the two blow molding modules 41 are horizontally parallel between the two support frames 5 and are adjustable. The support rail prevents the blow molding module 41 from being deflected downward by gravity, and the positioning alignment is inaccurate, which affects the production quality.
  • the adjustable support rail includes two upper and lower guide rails 7 disposed between the two support brackets and extending through the two blow molding modules 41 and an adjusting mechanism for adjusting the position of the rail rods 7 when the blow molding module 41 is installed. It is inevitable to avoid positional deviation, inaccurate alignment, etc., so an adjustment mechanism is needed to further adjust the positioning so that the blow molding module 71 is aligned accurately.
  • the support frame 5 is provided with a support through hole 51 for supporting the cylinder pushing device 42 to push the blow molding module 41. Since the production of the large-capacity plastic hollow container requires a larger blow molding module 4, the driving blow molding is performed. Module 41 requires a larger push cylinder, so the push cylinder needs to support the support, avoiding gravity imbalance leading to unstable operation and affecting production quality.
  • the working process of the present invention i.e., one-step method, injection blow molding process
  • injection blow molding process i.e., injection blow molding process
  • the movable mold is started, and the movable mold 1 is clamped with the fixed mold 2, as shown in Figs. 1 and 2, and then the parison is injected. After the injection of the parison is completed, the movable mold 1 is moved backward to drive the parison forming core rod 15 Simultaneously moving, the parison forming mandrel 15 is always fixed in the movable mold, and the parison is adhered to the parison forming mandrel 15.
  • the blow molding module 41 is closed, when blowing After the molding module 41 is completely closed, as shown in FIGS.
  • the parison forming mandrel 15 is blown, the high-pressure air is blown into the interior of the parison, and the exhaust gas stabilizing device performs the exhaust cooling in a timed manner to complete the hollow container.
  • Blow molding after blow molding is completed (as shown in Figures 5 and 6), the blow molding module 41 is opened, and then the pusher plate 13 pushes the container thread forming assembly 14 with The blow molding module 41 is axially moved together for a distance, and then the container thread forming module 141 is opened by the opening and closing cylinder 142, the blow molding module 4 is opened simultaneously with the opening container thread forming module 141, and finally the push plate 13 is formed into a hollow container top. Out. The mold equipment then begins the next one-step, injection blow molding process, and so on.
  • the present invention also includes a stretching mechanism including a stretching rod 8 disposed in the parison forming mandrel 15 for axially stretching the parison, and a driving mechanism of the stretching rod. In the blow molding process, the parison is stretched while blowing the parison.
  • the working process of the present invention (one-step method, injection-blowing process) is as follows:
  • the movable mold is started, and the movable mold 1 is clamped with the fixed mold 2, as shown in Figs. 1 and 2, and then the parison is injected. After the injection of the parison is completed, the movable mold 1 is moved backward to drive the parison forming core rod 15 Simultaneously moving, the parison forming mandrel 15 is always fixed in the movable mold, and the parison is adhered to the parison forming mandrel 15.
  • the blow molding module 41 is closed, when blowing After the molding module 41 is completely closed, as shown in FIGS.
  • the parison forming mandrel 15 is blown, the high-pressure air is blown into the interior of the parison, and the exhaust gas stabilizing device performs the timing exhaust cooling, and at the same time,
  • the stretching rod 8 in the blank forming mandrel 15 is ejected, and the parison is stretched to complete the blow molding of the hollow container.
  • the blow molding module 41 is opened.
  • the pusher plate 13 pushes the container thread forming assembly 14 axially together with the blow molding module 41 for a distance, and then the container thread forming module 141 is opened by the opening and closing cylinder 142, and the blow molding module 4 and the open container thread forming module 141 are opened. Open at the same time, The push plate 13 forming the top of the hollow vessel. The mold equipment then begins the next one-step, injection blow molding process, and so on.
  • the molding process of the invention for injecting a large-capacity plastic hollow container by using the above-mentioned mold equipment is as follows:
  • the process includes an injection molding process and a blow molding process.
  • the moving mold, the moving mold and the fixed mold are closed, and after the mold is closed, the injection molding parison is moved, and after the injection molding parison is cooled to the parting temperature, the moving mold is moved backward. , the movable mold and the fixed mold splitting, and then enter the blow molding process; during the blow molding process, the two blow molding modules are closed under the guiding action of the adjustable support rail, and then the parison forming core rod blows the parison and blows the air.
  • the exhaust gas pressure regulator performs internal exhaust, accelerates the parison molding cooling, completes the blow molding of the hollow container, opens the blow molding module, pushes the container thread forming assembly and blows on the push plate
  • the molding module is moved axially together for a distance, and then the container thread forming assembly and the blow molding module are simultaneously opened to eject the formed hollow container.
  • the parison forming mandrel moves synchronously with the moving mold, and the parison forming core rod is always fixed in the moving mold, the relative moving mold does not move, and the injection blank adheres.
  • the blow molding module is closed, the parison forming mandrel opens the blowing port, and the high pressure air enters the inside of the parison. Blowing, at the same time, the exhaust gas regulator performs timed exhaust cooling to quickly complete the blow molding of the hollow container.
  • the injection molding stage between the injection and the mold opening, only the injection blank is formed, and the mold is not required to be cooled and cooled.
  • the equipment is in the mold clamping state; the blow molding module is closed in the blow molding stage, and the blow molding and the opening and ejection are all performed on the same mold.

Description

一种注吹大容量塑料中空容器的模具设备及其工艺方法 技术领域
本发明涉及一种注吹塑料的模具设备， 具体涉及一种注吹大容量塑料中空容器的模具设 备。
本发明还涉及应用在注吹大容量塑料中空容器的模具设备中注吹大容量塑料中空容器的 工艺方法。 背景技术
现有的大型塑料中空容器工艺成型方法中， 基本都是用 "挤出一吹塑"方法来生产， 采 用此种方法制作大型塑料中空容器的具体过程为： 通过塑料挤出机挤出管状型料， 再经过独 立的吹塑模具合模吹气而制成大型塑料容器， 其产品外观有夹缝， 不平滑， 瓶口和瓶底有废 料， 不平整， 瓶口尺寸不准确， 密封性差等缺陷。
针对上述 "挤出一吹塑"法存在的不足， 专利号为 CN95117243. 3的中国发明专利提出了 一种用拉伸吹模法模制大型容器的方法， 其方法是通过注吹的方法来实现大型塑料容器的生 产。 首先在注塑机上注塑型坯， 再将型坯取出， 移到一个预热装置上加热型坯到预定温度后， 放入吹塑模具进行吹塑成大型中空塑料容器。 其上述方法是一种二步法的加工方法， 存在的 问题是加工过程中， 注塑型坯较大， 又有一定的温度， 在移动过程会产生物料下垂， 造成移 动困难， 型坯容易变形。
随着科技的进步， 目前注吹塑料中空容器技术上开始流行一步法成型工艺， 但是当今国 内外应用一步法生产注吹中空容器都是采用专用设备来生产，投入的资金巨大， 维护费用高。 为此， 现在已有相关科研投入在普通卧式注塑机上实行一步法成型工艺， 如中国发明专利
CN200810025749. 6提出了一歩法、 单工位注、 吹塑料中空容器成型产品的模具及其应用， 其 模具可应用在普通的卧式注塑机上实现一步法、 单工位注、 吹塑料中空容器。 该专利所述的 模具包括注塑模组件及吹塑模组件， 注塑模组件包括动模和定模， 动模和定模分别通过动模 安装板及定模安装板安装在卧式注塑机上， 注塑机设有四条支撑导轨， 所述动模安装板滑动 安装在支撑导轨上， 所述定模安装板固定安装在支撑导轨上， 动模通过驱动装置驱动可沿支 撑导轨横向移动， 定模上设有注塑型坯凹模， 动模上设有带有吹气口且为中空的型坯成型芯 棒，型坯成型芯棒与注塑型坯凹模对中配套设置，动模上对应型坯成型芯棒设有吹塑模组件， 所述吹塑模组件包括两侧吹塑成型模块及推动吹塑成型模块纵向移动的推动装置。 该专利模 具具有诸多优点， 可以应用在普通卧式注塑机上， 不需要专用设备， 减少设备资金投入， 且 制成品表面无夹缝， 同时提高产品均匀度和强度， 产品质量稳定， 一步法单工位生产自动化 程度高、 生产效率高。 但是其结构决定其只能应用于生产小容量塑料中空容器， 而不适用生 产大容量塑料中空容器， 原因主要有以下几点： （1 ) 由于该专利模具用于生产小容量容器， 其动模和定模体积较小， 动模和定模横向凸出量相对小， 在重力的作用下对中变形小， 因而 采用普通的固定结构可保证其定位对中准确，但是当生产大容量塑料中空容器（主要指 5^200 公升容积的大容量塑料中空容器） 时， 其需要动模的体积及重量就相应增大， 其横向凸出量 也大， 因此， 采用该专利的结构时， 动模在重力的作用下会向下弯曲变形， 定位对中不准确。 ( 2 ) 由于该专利模具用于生产小容量容器， 吹塑模组件体积和重量相对较少， 其吹塑成型模 块采用安装在动模上的推动装置支撑定位即可保证定位准确， 不需要额外的定位装置， 而如 果生产大容量塑料中空容器时，所需的吹塑模组件体积和重量就相应增大，采用上述结构时， 在重力的作用下两侧吹塑成型模块会出现向下偏移的现象， 定位不准确， 生产不稳定， 导致 产品变形， 废品率大。 （3 ) 由于该专利模具用于生产小容量容器， 型坯相对较小， 在型坯成 型芯棒吹塑的过程中可以不用拉伸型坯也能保证产品的吹塑质量， 但是当生产大容量塑料中 空容器时， 型坯相对较大， 型坯不拉伸会导致吹塑困难， 且容易导致吹塑产品不均匀， 吹塑 破孔等吹塑失败情况， 其废品率大。 上述技术难题导致目前还没有出现采用类似模具工艺方 法生产大容量塑料容器的技术出现。 发明内容
本发明的目的在于针对上述问题不足之处， 提供一种采用一步法、 单工位注吹大容量塑 料中空容器的模具设备。
为了达到上述目的， 本发明采用以下技术方案：
一种注吹大容量塑料中空容器的模具设备，包括注塑机导轨、注塑模组件和吹塑模组件， 注塑模组件包括左右对中平行设置的动模和定模， 动模安装注塑机的动模板上， 定模固定在 注塑机的定模板上， 所述动模的内侧面设有一可水平方向左右移动的推板， 推板的外侧面设 有包括两容器螺纹成型模块的容器螺纹成型组件， 且所述动模设有穿过推板及容器螺纹成型 组件的型坯成型芯棒， 该型坯成型芯棒为中空且设有吹气口及带有排气稳压装置的排气口， 所述型坯成型芯棒两侧设置可开合的吹塑模组件， 该吹塑模组件包括两块分别位于型坯成型 芯棒两侧的吹塑成型模块及用于推动吹塑成型模块开合的推动装置， 所述动模前端两侧设有 支撑架， 且该支撑架滑动安装在注塑机导轨上， 所述吹塑模组件安装在该支撑架上， 两支撑 架之间水平平行设有用于支撑安装两吹塑成型模块的滑动导轨及可调节支撑导轨。
进一步， 上述可调节支撑导轨包括上下两条设于两支撑架之间且贯穿支撑两吹塑成型模 块的导轨杆及用于调整导轨杆位置的调节机构。
进一步具体， 上述推动装置为油缸推动装置， 所述支撑架上设有支撑孔用于承托油缸推 动装置推动吹塑成型模块。
本发明的模具设备还包括一拉伸机构， 该拉伸机构包括设于型坯成型芯棒内可将型坯进 行轴向拉伸的拉伸杆及该拉伸杆的驱动机构， 可以在注吹的过程中进一步增加拉动作， 从而 可以实现一步法、 注拉吹大容量塑料中空容器。
本发明的另一个目的是提供一种采用上述模具设备注吹大容量塑料中空容器的成型工艺 方法。
为了达到上述目的， 本发明采用以下技术方案- 采用上述模具设备注吹大容量塑料中空容器的工艺方法， 其工艺过程包括注塑过程和吹 塑过程； 注塑过程中， 移动动模， 动模与定模闭合， 合模后， 注塑型坯， 当注塑型坯冷却到 分模温度后， 往后移动动模， 动模与定模分模， 随后进入吹塑过程； 吹塑过程中， 两吹塑成 型模块在可调节支撑导轨的导向作用下闭合， 然后型坯成型芯棒向型坯吹气， 吹气过程中， 在工艺要求的压力下， 排气稳压装置进行内排气， 加速型坯成型冷却， 完成吹塑中空容器后， 打开吹塑成型模块后，在推板推动容器螺纹成型组件与吹塑成型模块一起轴向移动一段距离， 然后同时打开容器螺纹成型组件和吹塑成型模块， 将成型的中空容器顶出。
进一步， 上述模具设备还包括一拉伸机构， 该拉伸机构包括设于型坯成型芯棒内可将型 坯进行轴向拉伸的拉伸杆及该拉伸杆的驱动机构； 在吹塑的过程中， 对型坯吹气的同时将型 坯进行拉伸。
在注塑阶段与吹塑阶段中， 动模和定模开启后， 型坯成型芯棒随动模一起同步移动， 而 型坯成型芯棒始终固定在动模中相对动模不移动， 注射坯料黏附在型坯成型芯棒， 动模和定 模完全开启后， 吹塑成型模块闭合， 型坯成型芯棒打开吹气口吹气， 高压空气进入型坯内部 吹气， 同时排气稳压装置进行定时内排气冷却， 快速完成中空容器的吹塑成型； 注塑阶段在 注射与开模之间， 只有注射坯料成型， 无需保压合冷却定型， 此时模具设备处于合模状态； 吹塑阶段的吹塑成型模块的闭合， 吹气成型及开启顶出均在同一个模具上完成。
与现有技术相比， 本发明的有益效果如下-
1 )本发明直接应用在普通卧式注塑机上，解决现有生产小容量塑料中空容器的模具设备 因结构缺陷不能用于生产大容量塑料中空容器的技术难题， 通过增加支撑架承托大容量中空 容器的大型重型动模及吹塑模组件， 构成科学合理的刚性支撑， 动模及吹塑模组件移动运行 稳定， 对中定位准确； 本发明不需要专用设备， 实现一步法完成注塑、 吹塑大容量塑料中空 容器， 简化程序， 降低设备成本。 2) 本发明所述的模具设备适用生产大容量塑料中空容器， 模具设备生产自动化程度高、 生产效果高。
3)本发明所述的模具设备实现一体化、单工位注吹或吹拉注大容量塑料中空容器成型产 品， 使型坯到大容量中空容器成品一歩完成， 产品表面无夹缝， 能有效提高塑料大容量中空 容器的均匀度和产品的强度， 使得产品质量更易保证。
4)增加支撑安装两吹塑成型模块的滑动导轨及可调节支撑导轨，避免生产大容量中空容 器时吹塑成型模块体积重量增加而出现偏移走位对中不准确等问题， 使两吹塑成型模块闭合 对中准确移动平稳， 适合大容量中空容器生产。
5) 吹气过程中， 排气稳压装置进行内排气冷却， 加速型坯成型内外冷却定型。
6)本发明的模具设备结构紧凑， 安装容易， 操作、 维修简单； 整个工艺过程简单， 易于 实现。 附图说明
图 1为本发明合模注塑时结构剖视图。
图 2为本发明合模注塑时结构立体图。
图 3为本发明吹起成型时结构剖视图。
图 4为本发明吹起成型时结构立体图。
图 5为本发明开模顶出时结构剖视图。
图 6为本发明开模顶出时结构立体图。
以下通过附图和具体实施方式对本发明作进一步说明： 具体实施方式
如图 1至 6所示， 本发明所述的注吹大容量塑料中空容器的模具设备， 包括注塑机导轨 3、 注塑模组件和吹塑模组件 4。
所述注塑模组件包括左右对中平行设置的动模 1和定模 2，， 动模 1安装注塑机的动模板
11上， 定模 2固定在注塑机的定模板 21上，动模 1通过一组驱动装置驱动其沿注塑机导轨 3 上左右移动， 从而实现动模 1与定模 2的开合。
所述定模 2设有注塑型坯凹模 22。
所述动模 1包括进气板 12、推板 13、容器螺纹成型组件 14及型坯成型芯棒 15。具体为： 所述进气板 12固定在动模板 11上， 且其与一气缸连通； 进气板 12上安装型坯成型芯棒 15， 型坯成型芯棒 15为中空且设有吹气口及带有排气稳压装置的排气口， 其与进气板 12的气缸 连通， 型坯成型芯棒 15与注塑型坯凹模 22配合用于组成注塑模腔。上述进气板 12外侧（或 叫动模的内侧面）设有一可水平方向左右移动的推板 13， 推板的外侧面设有容器螺纹成型组 件 14， 该容器螺纹成型组件 14包括两则容器螺纹成型模块 141及驱动两侧容器螺纹成型模 块 141开合的开合气缸 142， 上述型坯成型芯棒 15穿过推板 13及容器螺纹成型组件 14， 所 述容器螺纹成型模块组件 14外侧面、 型坯成型芯棒 15两则外设置吹塑成型模块组件 4。 上 述吹塑成型模块组件 4包括两块分别位于型坯成型芯棒 15两侧的吹塑成型模块 41及用于推 动吹塑成型模块开合的推动装置， 该推动装置具体为油缸推动装置 42。
进一步， 由于大容量塑料中空容器生产所需的动模 1体积和重量会相应增大， 为了保证 动模 1 的结构坚固稳定及定位和对中准确， 所述动模前端两侧设有支撑架 5， 且该支撑架 5 滑动安装在支撑导轨 3上， 支撑架 5与动模 1可同步沿支撑导轨 3移动， 支撑架 5起到支撑 承托动模 1的作用， 使动模 1移动的时候平滑稳健，合模定位和对中准确假如不设置支撑架， 大容量塑料中空容器生产所需的动模 1由于重量大， 在合模移动中会不稳定， 动模 1也容易 过重损毁， 而且动模 1会因重力出现变形， 合模定位和对中偏差大。
进一步具体， 由于生产大容量塑料中空容器需要更大的吹塑模组件 4，所述吹塑模组件 4 重量也相应增大，为了保证吹塑模组件 4结构坚固稳定及两吹塑成型模块 41合模平稳对位准 确， 上述吹塑模组件 4安装在支撑架 5上， 两支撑架 5之间水平平行设有用于支撑安装两吹 塑成型模块 41的滑动导轨 6及可调节支撑导轨， 防止吹塑成型模块 41在重力的作用下向下 偏移， 定位对中不准确， 影响生产质量。 上述可调节支撑导轨包括上下两条设于两支撑架之 间且贯穿支撑两吹塑成型模块 41的导轨杆 7及用于调整导轨杆 7位置的调节机构，在安装吹 塑成型模块 41的时候不能避免出现位置偏差， 对中不准确等情况， 因此需要调节机构来进一 步调整定位， 以使吹塑成型模块 71对位准确。 进一步， 所述支撑架 5上设有支撑穿孔 51用 于承托油缸推动装置 42推动吹塑成型模块 41， 由于生产大容量塑料中空容器需要更大的吹 塑模组件 4， 驱动吹塑成型模块 41需要更大的推动油缸， 因此推动油缸需要支撑承托， 避免 重力失衡导致运行不稳定， 影响生产质量。
本发明的工作过程 （即一步法、 注吹塑过程） 如下：
启动动模， 使动模 1与定模 2合模， 如图 1和 2所示， 然后注射型坯， 型坯注射完成后， 动模 1往后移动， 带动型坯成型芯棒 15—起同步移动， 型坯成型芯棒 15始终固定在动模不 动， 型坯黏附在型坯成型芯棒 15上， 当动模 1与定模 2完全开启后， 吹塑成型模块 41闭合， 当吹塑成型模块 41完全闭合后， 如图 3和 4所示， 型坯成型芯棒 15吹气， 高压空气进入型 坯内部吹气， 同时排气稳压装置进行定时内排气冷却， 完成中空容器的吹塑成型， 吹塑完成 后， （如图 5和 6所示）， 打开吹塑成型模块 41， 然后在推板 13推动容器螺纹成型组件 14与 吹塑成型模块 41一起轴向移动一段距离， 接着由开合气缸 142打开容器螺纹成型模块 141， 吹塑成型模块 4与打开容器螺纹成型模块 141同时打开，最后推板 13将成型的中空容器顶出。 然后模具设备再开始进行下一个一步法、 注吹塑过程， 如此循环。
更进一步， 当生产更大容量塑料中空容器时， 型坯相对较大， 型坯不拉伸会导致吹塑困 难， 且容易导致吹塑产品不均匀， 吹塑破孔等吹塑失败情况， 废品率大。 因此本发明还包括 一拉伸机构，该拉伸机构包括设于型坯成型芯棒 15内可将型坯进行轴向拉伸的拉伸杆 8及该 拉伸杆的驱动机构。 在吹塑的过程中， 对型坯吹气的同时将型坯进行拉伸。
设置拉伸机构后， 本发明的工作过程 （一步法、 注拉吹过程） 如下：
启动动模， 使动模 1与定模 2合模， 如图 1和 2所示， 然后注射型坯， 型坯注射完成后， 动模 1往后移动， 带动型坯成型芯棒 15—起同步移动， 型坯成型芯棒 15始终固定在动模不 动， 型坯黏附在型坯成型芯棒 15上， 当动模 1与定模 2完全开启后， 吹塑成型模块 41闭合， 当吹塑成型模块 41完全闭合后， 如图 3和 4所示， 型坯成型芯棒 15吹气， 高压空气进入型 坯内部吹气， 同时排气稳压装置进行定时内排气冷却， 同时， 型坯成型芯棒 15内的拉伸杆 8 顶出， 对型坯进行拉伸， 完成中空容器的吹塑成型， 吹塑完成后， （如图 5和 6所示）， 打开 吹塑成型模块 41， 然后在推板 13推动容器螺纹成型组件 14与吹塑成型模块 41一起轴向移 动一段距离， 接着由开合气缸 142打开容器螺纹成型模块 141， 吹塑成型模块 4与打开容器 螺纹成型模块 141同时打开，最后推板 13将成型的中空容器顶出。然后模具设备再开始进行 下一个一步法、 注吹塑过程， 如此循环。
本发明采用上述模具设备注吹大容量塑料中空容器的成型工艺方法如下：
其工艺过程包括注塑过程和吹塑过程； 注塑过程中， 移动动模， 动模与定模闭合， 合模 后， 注塑型坯， 当注塑型坯冷却到分模温度后， 往后移动动模， 动模与定模分模， 随后进入 吹塑过程； 吹塑过程中， 两吹塑成型模块在可调节支撑导轨的导向作用下闭合， 然后型坯成 型芯棒向型坯吹气， 吹气过程中， 在工艺要求的压力下， 排气稳压装置进行内排气， 加速型 坯成型冷却， 完成吹塑中空容器后， 打开吹塑成型模块后， 在推板推动容器螺纹成型组件与 吹塑成型模块一起轴向移动一段距离， 然后同时打开容器螺纹成型组件和吹塑成型模块， 将 成型的中空容器顶出。
进一步， 在吹塑的过程中， 当生产更大容量塑料中空容器时， 对型坯吹气的同时将型坯 进行拉伸。
在注塑阶段与吹塑阶段中， 动模和定模开启后， 型坯成型芯棒随动模一起同步移动， 而 型坯成型芯棒始终固定在动模中相对动模不移动， 注射坯料黏附在型坯成型芯棒， 动模和定 模完全开启后， 吹塑成型模块闭合， 型坯成型芯棒打开吹气口吹气， 高压空气进入型坯内部 吹气， 同时排气稳压装置进行定时内排气冷却， 快速完成中空容器的吹塑成型； 注塑阶段在 注射与开模之间， 只有注射坯料成型， 无需保压合冷却定型， 此时模具设备处于合模状态； 吹塑阶段的吹塑成型模块的闭合， 吹气成型及开启顶出均在同一个模具上完成。

Claims

权 利 要 求 书
1、一种注吹大容量塑料中空容器的模具设备， 包括注塑机导轨、注塑模组件和吹塑模组 件， 注塑模组件包括左右对中平行设置的动模和定模， 动模安装注塑机的动模板上， 定模固 定在注塑机的定模板上，其特征在于：所述动模的内侧面设有一可水平方向左右移动的推板， 推板的外侧面设有包括两容器螺纹成型模块的容器螺纹成型组件； 所述动模设有穿过推板及 容器螺纹成型组件的型坯成型芯棒， 该型坯成型芯棒为中空且设有吹气口及带有排气稳压装 置的排气口， 所述型坯成型芯棒两侧设置可开合的吹塑模组件， 该吹塑模组件包括两块分别 位于型坯成型芯棒两侧的吹塑成型模块及用于推动吹塑成型模块开合的推动装置， 所述动模 前端两侧设有支撑架， 且该支撑架滑动安装在注塑机导轨上， 所述吹塑模组件安装在该支撑 架上， 两支撑架之间水平平行设有用于支撑安装两吹塑成型模块的滑动导轨及可调节支撑导 轨。
2、根据权利要求 1所述的注吹大容量塑料中空容器的模具设备， 其特征在于： 所述可调 节支撑导轨包括上下两条设于两支撑架之间且贯穿支撑两吹塑成型模块的导轨杆及用于调整 导轨杆位置的调节机构。
3、根据权利要求 1所述的注吹大容量塑料中空容器的模具设备， 其特征在于： 上述推动 装置为油缸推动装置， 所述支撑架上设有支撑孔用于承托油缸推动装置推动吹塑成型模块。
4、根据权利要求 1所述的注吹大容量塑料中空容器的模具设备， 其特征在于： 还包括一 拉伸机构， 该拉伸机构包括设于型坯成型芯棒内可将型坯进行轴向拉伸的拉伸杆及该拉伸杆 的驱动机构。
5、采用权利要求 1所述模具设备注吹大容量塑料中空容器的工艺方法， 其特征在于： 其 工艺过程包括注塑过程和吹塑过程； 注塑过程中， 移动动模， 动模与定模闭合， 合模后， 注 塑型坯， 当注塑型坯冷却到分模温度后， 往后移动动模， 动模与定模分模， 随后进入吹塑过 程； 吹塑过程中， 两吹塑成型模块在可调节支撑导轨的导向作用下闭合， 然后型坯成型芯棒 向型坯吹气， 吹气过程中， 在工艺要求的压力下， 排气稳压装置进行内排气， 加速型坯成型 冷却， 完成吹塑中空容器后， 打开吹塑成型模块后， 在推板推动容器螺纹成型组件与吹塑成 型模块一起轴向移动一段距离， 然后同时打开容器螺纹成型组件和吹塑成型模块， 将成型的 中空容器顶出。
6、根据权利要求 5所述的工艺方法， 其特征在于： 所述模具设备还包括一拉伸机构， 该 拉伸机构包括设于型坯成型芯棒内可将型坯进行轴向拉伸的拉伸杆及该拉伸杆的驱动机构； 在吹塑的过程中， 对型坯吹气的同时将型坯进行拉伸。
7、根据权利要求 5所述的成型工艺方法， 其特征在于： 在注塑阶段与吹塑阶段中， 动模 和定模开启后， 型坯成型芯棒随动模一起同步移动， 而型坯成型芯棒始终固定在动模中相对 动模不移动， 注射坯料黏附在型坯成型芯棒， 动模和定模完全开启后， 吹塑成型模块闭合， 型坯成型芯棒打开吹气口吹气， 高压空气进入型坯内部吹气， 同时排气稳压装置进行定时内 排气冷却， 快速完成中空容器的吹塑成型； 注塑阶段在注射与开模之间， 只有注射坯料成型， 无需保压合冷却定型， 此时模具设备处于合模状态； 吹塑阶段的吹塑成型模块的闭合， 吹气 成型及开启顶出均在同一个模具上完成。
PCT/CN2010/079380 2010-09-06 2010-12-02 一种注吹大容量塑料中空容器的模具设备及其工艺方法 WO2012031434A1 (zh)

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CN115847774B (zh) * 2023-03-02 2023-04-28 汕头市龙琪塑料制品有限公司 保健品包装用食品级pe容器一步法注塑成型装置、工艺
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