JP6457055B2 - Blow molding equipment - Google Patents

Description

  The present invention relates to a blow molding apparatus that blows a bottomed cylindrical preform to form a casing, and more particularly to a device that uses a liquid as a pressurized fluid for blow molding.

  Resin casings such as expanded polypropylene (OPP) casings and polyethylene terephthalate (PET) casings (pet bottles) are used for various purposes such as beverages, foods, and cosmetics. Is used. Such a casing is generally formed by biaxially stretching blow-molding a resin preform formed into a bottomed cylindrical shape by injection molding or the like using a blow molding apparatus.

  As a blow molding device, a device that uses a pressurized liquid instead of pressurized air as a pressurized fluid filled in a preform is known. In this case, by using the content liquid that is finally filled in the product, such as beverages, cosmetics, and medicines, as a liquid, the filling process of the content liquid into the housing is omitted, and the production process is simplified. Can do.

  By the way, when the casing filled with the content liquid is taken out from the mold of the blow molding apparatus and transported to the downstream process, the content liquid spills from the casing due to the influence of speed change or vibration when moving the casing. As a result, there may be a problem that the content liquid in the housing is insufficient or the apparatus becomes dirty.

  For example, Patent Literature 1 includes ducts 140 and 145 and injection ports 148 and 149 for injecting liquid into the preform 110 as a technique that can solve such a problem. An apparatus is disclosed that includes a mold 100 in which a cavity to be formed into a bottle shape is formed, a stretching rod 130 for stretching a preform 110, and a stopper device 240 for fixing and holding a cap on a bottle filled with a liquid. Yes.

Special table 2011-527244 gazette

  By the way, in the apparatus of Patent Document 1, when the bottle is formed, the stopper device 240 is retracted and the stretching rod 130 is positioned immediately above the preform 110, while when the cap is attached to the bottle, the stretching rod 130 is used. It is necessary to retract and to place the stopper device 240 directly above the bottle. That is, in order to prevent the stretching rod 130 and the stopper device 240 from interfering with each other, it is necessary to make both of them movable with respect to the mold, so that the structure of the device becomes complicated and the size of the device increases. It was connected to.

  An object of the present invention is to solve such problems, and an object of the present invention is to provide a device for blow-molding a preform with a liquid while providing a function of sealing a casing with a cap. The present invention is to propose a new blow molding apparatus capable of simplifying the structure compared to a conventional apparatus having a stopper device.

The present invention includes a blow molding die to which a bottomed cylindrical preform is attached, and a blow nozzle connected to a mouth tube portion of the preform attached to the die, and a pressurized liquid is provided. A blow molding apparatus for forming a casing by expanding the preform into a shape along a cavity of the mold by feeding the blow nozzle into the preform,
Blow nozzle moving means for raising and lowering the blow nozzle along the axis of the preform;
After forming the casing, after raising the blow nozzle, a tray that moves forward directly below the blow nozzle above the cap that is supplied to the mouth tube portion of the casing , and
The blow nozzle is a blow molding device having cap attaching means for fixing and holding a cap for sealing the casing to the mouth tube portion of the casing when the blow nozzle is lowered by the operation of the blow nozzle moving means.

  It is preferable that the cap attaching means is a front end portion of the blow nozzle that abuts on an upper surface of the cap and pushes the cap into a mouth tube portion of the casing.

  It is preferable that the cap has a concave portion that is open upward, and a tip portion of the blow nozzle has a protrusion that fits into the concave portion and positions the cap.

  It is preferable that the tip of the blow nozzle pushes the upper surface of the cap through the tray.

  It is preferable that the cap attaching means is a rotating portion of the blow nozzle that is provided so as to be rotatable around a central axis of the blow nozzle and that screwes the cap into the mouth tube portion of the casing.

  In the present invention, the cap nozzle is provided in the blow nozzle, and the cap is fixedly held on the mouth tube portion of the housing by lowering the blow nozzle, so that only the blow nozzle moves relative to the mold. become. For this reason, it becomes possible to simplify a structure rather than the conventional apparatus.

  If the cap mounting means is the tip of the blow nozzle that abuts the top surface of the cap and pushes the cap into the casing tube, the cap that engages with the undercut provided in the casing tube It can be fixedly held with respect to the housing. Here, when the cap has a concave portion that is open upward and the tip of the blow nozzle has a protrusion that fits into the concave portion and positions the cap, the blow nozzle and the cap are lowered when the blow nozzle is lowered. And the cap can be securely fixed to the housing.

  When the cap attaching means is a rotating part of a blow nozzle that is provided so as to be rotatable around the central axis of the blow nozzle and screw the cap into the mouth tube part of the housing, the cap attaching means is related to the screw part provided in the mouth tube part of the housing. The cap to be joined can be fixedly held with respect to the housing.

(A) is a figure which shows the state which mounted | wore the preform with the metal mold | die according to this invention, (b) is a figure which shows the state which lowered | hung the blow nozzle after (a). It is sectional drawing which expands and shows the blow nozzle periphery of the figure shown in FIG.1 (b). FIG. 1B shows a process following the state shown in FIG. 1B. FIG. 1A is a view showing a state in which a pressurized liquid is fed to the preform while lowering the stretching rod, and FIG. It is a figure which shows the state which raised the blow nozzle later, supplied the cap, and advanced the saucer. FIG. 3B is a diagram showing a process subsequent to FIG. 3B, in which FIG. 3A is a diagram illustrating a state in which the tray is retracted and the blow nozzle is lowered to push the cap into the mouth tube portion of the housing, and FIG. It is a figure which shows the state which raised the blow nozzle after. It is sectional drawing which expands and shows the blow nozzle periphery of the figure shown to Fig.4 (a). It is a figure which shows other embodiment of a blow nozzle according to FIG.

  Hereinafter, an embodiment of a blow molding apparatus according to the present invention will be described with reference to FIGS. 1B and 2. The blow molding apparatus of the present embodiment includes a mold 1, a blow nozzle 2, a stretching rod 3, a cap attachment unit 4, and a liquid receiving unit 5.

  As shown in FIG. 2, the mold 1 includes a cavity 1 a having a bowl shape, and a circular opening 1 b connected to the cavity 1 a and opening on the upper surface of the mold 1. The mold 1 is configured so that the mold can be opened left and right with the central axis of the opening 1b as a boundary. By opening the mold 1, the molded body can be taken out from the mold 1. .

  A preform P can be attached to the opening 1b. The illustrated preform P is formed into a bottomed cylindrical shape by injection molding or the like using a resin material such as polypropylene (PP) or polyethylene terephthalate (PET), and has a test tubular main body with an enlarged upper portion. A neck ring P2 extending radially outward and a cylindrical mouth tube portion P3 are integrally connected to the upper end of P1. Further, an upper portion of the mouth tube portion P3 is provided with an undercut portion P4 that protrudes outward in the radial direction. When the preform P is mounted on the mold 1, the center axis of the preform P coincides with the center axis of the opening 1b.

  The blow nozzle 2 includes a passage 2a extending in the vertical direction inside. The passage 2a is connected to a pressurized liquid supply unit (not shown) and can supply pressurized liquid. The outlet of the passage 2a is provided with a cylindrical pouring part 2b provided coaxially with the central axis of the opening 1b. The liquid pressurized through the pouring part 2b is applied to the preform P. Can be sent. Further, on the radially outer side of the pouring portion 2b, a cylindrical seal portion 2c is in contact with the upper and outer peripheral surfaces of the mouth tube portion P3 of the preform P, and the tip portion is in contact with the upper surface of the neck ring P2. Is provided. The seal portion 2c is also provided coaxially with the central axis of the opening 1b.

  The blow nozzle 2 can be raised and lowered along the central axis of the opening 1b by blow nozzle moving means (not shown). As the blow nozzle moving means, for example, a combination of a linear guide provided with a slider on a linear track extending in the vertical direction and a ball screw that converts the rotational motion of the motor into linear motion can be used. Various types can also be employed.

  The stretching rod 3 extends in the vertical direction and forms a columnar shape, and is provided in the passage 2a. The stretching rod 3 is configured to be able to rise and fall relative to the blow nozzle 2.

  As shown in FIG. 5, the cap attachment means 4 holds the cap C fixedly to the mouth tube portion B3 of the casing B obtained by blow-molding the preform P. Here, the cap C of the present embodiment includes a cap body C1 and an adapter C2 attached to the outside of the cap body C1. The cap body C1 has a shape of a covered cylinder and has a flange at the lower end, and is formed so as to engage the undercut portion B4 of the mouth tube portion B3 and seal the casing B. The adapter C2 has a groove fitted to the flange of the cap body C1, and has an upwardly open recess C3 on the upper surface thereof. And the cap attachment means 4 of this embodiment is the tip of the blow nozzle 2 which contacts the upper surface of the adapter C2 and pushes the cap C into the tube portion B3 when the blow nozzle 2 is lowered by the operation of the blow nozzle moving means. Specifically, the tip 2d of the extraction part 2b and the tip 2e of the seal part 2c. Note that the cap C may be pressed by only one of the distal end portion 2d of the dispensing portion 2b or the distal end portion 2e of the seal portion 2c, and the cap C may be pressed by another portion located below the blow nozzle 2. May be.

  The liquid receiving means 5 can receive the liquid even if it drops from the dispensing part 2b, and is disposed on the side of the blow nozzle 2 as shown in FIG. ing. The liquid receiving means 5 is constituted by a receiving tray 5a formed of an L-shaped plate in the illustrated example, and a receiving tray moving means 5b capable of moving the receiving tray 5a directly below the pouring portion 2b. . The tray moving means 5b of the present embodiment is a cylinder with a guide, but is not limited to this.

  The blow molding apparatus of the present embodiment is not shown in the figure, but a preform supply means for supplying the preform P to the mold 1 and a cap supply for supplying the cap C to the mouth tube portion B3 of the casing B. Means and a housing transporting means for taking out the molded housing B from the mold 1 and transporting it to the downstream process. As the preform supply means, the cap supply means, and the housing transport means, for example, a preformed cylinder, a cylinder with a guide provided with a holder for holding the housing can be used. Can be adopted. Note that an operator may supply and take out the preform without using the preform supply unit, the cap supply unit, and the housing transport unit.

  In order to perform blow molding using the blow molding apparatus configured as described above, first, preform P is supplied to the mold 1 that has been opened by the preform supply means, as shown in FIG. The mold 1 is clamped. Then, as shown in FIG. 1B, the blow nozzle 2 is lowered by the operation of the blow nozzle moving means. Thereby, as shown in FIG. 2, the pouring portion 2b enters the inside of the mouthpiece portion P3, the seal portion 2c abuts on the upper surface and the outer peripheral surface of the mouthpiece portion P3, and the tip portion 2e thereof is a neck ring. It contacts the upper surface of P2.

  Then, as shown in FIG. 3 (a), the draw rod 3 is lowered, and the pressurized liquid is supplied into the preform P from the dispensing portion 2b to expand the preform P, thereby forming the casing B. To do. Thereafter, the drawing rod 3 is raised and the supply of the liquid is stopped, the blow nozzle 2 is raised as shown in FIG. 3B, and the cap C is supplied to the mouth tube portion B3 of the casing B by the cap supply means. To do. Furthermore, in this embodiment, the saucer moving means 5b is operated and the saucer 5a is advanced just under the extraction part 2b. As a result, even if the liquid drips from the pouring portion 2b, the liquid does not spill into the cap C or the mold 1.

  Thereafter, as shown in FIG. 4 (a), the tray 5a is retracted, and the blow nozzle 2 is lowered. As a result, as shown in FIG. 5, the distal end 2d of the dispensing portion 2b and the distal end 2e of the seal portion 2c abut against the upper surface of the adapter C2, the cap C is pushed into the mouth tube portion B3, and the cap body C1 is Engage with the undercut portion B4. Thereafter, as shown in FIG. 4B, the blow nozzle 2 is raised and the mold 1 is opened. Thereafter, even if the housing B is transported by the housing transporting means, the housing B is sealed by the cap body C1, so that the liquid filled in the housing B will not be spilled.

  Thereafter, the adapter C2 is removed from the housing B, but can be reused by being attached to a new cap body C1. By using the adapter C2 as in the present embodiment, it is possible to prevent the cap body C1 from being damaged or soiled. Further, since the adapter C2 can be used as a gripping part at the time of conveyance, there is an advantage that the cap body C1 does not need to have a function as a gripping part, and the design flexibility of the cap body C1 is increased.

  Although the blow molding apparatus of the present embodiment is shown as an example (one batch type) in which one set of the mold 1 and the blow nozzle 2 is provided, it is preferable to provide a plurality of sets. Thereby, while blow molding is performed with one mold 1, the cap C can be attached to the other mold 1 after the blow molding is completed, so that the cycle time can be shortened.

  The present invention is not limited to this embodiment, and various modifications can be made within the scope according to the claims. For example, as shown in FIG. 6, when the outer diameter of the extraction portion 2b is made substantially the same as the inner diameter of the concave portion C3 and the tip portion 2d is fitted into the concave portion C3, the blow nozzle 2 is lowered when the blow nozzle 2 is lowered. Since the displacement between the nozzle 2 and the cap C can be prevented, the cap C can be fixed and held with respect to the housing B more reliably.

  The cap body C1 may be directly pushed by the blow nozzle 2 without using the adapter C2. Further, when the cap C is fixedly held on the mouth tube portion B3, it is possible to push the cap C with the blow nozzle 2 through the tray 5a while the tray 5a is moved forward. Further, the liquid receiving means 5 is not essential in the blow molding process, and it may not be used. Further, the casing B may be formed only with the pressurized liquid without using the stretching rod 3.

  Although illustration is omitted, when a cap that engages with a threaded portion provided in the mouth tube portion of the housing is used, the blow nozzle 2 is moved around the central axis of the blow nozzle 2 (the central axis of the extraction portion 2b). If the rotation part provided so that rotation is possible and a cap is rotated by this rotation part, a cap can be fixedly held with respect to a housing.

  According to the present invention, since the cap can be fixedly held to the bottle using the blow nozzle, the structure can be simplified compared to the conventional device having the stopper device, and the size of the device can be reduced. It is possible to provide a new blow molding apparatus capable of reducing the cost.

1: Mold 1a: Cavity 1b: Opening portion 2: Blow nozzle 2a: Passage 2b: Extraction portion 2c: Seal portion 2d: Distal end portion (distal end portion of blow nozzle)
2e: the tip of the seal part (tip of the blow nozzle)
3: Stretching rod 4: Cap mounting means 5: Liquid receiving means 5a: Sauce tray 5b: Sauce tray moving means B: Housing B1: Body part B2: Neck ring B3: Mouth tube part B4: Undercut part C: Cap C1: Cap Main body C2: Adapter C3: Recess P: Preform P1: Main body part P2: Neck ring P3: Mouth tube part P4: Undercut part

Claims (5)

A blow molding mold on which a bottomed cylindrical preform is mounted; and a blow nozzle connected to a mouth tube portion of the preform mounted on the mold; A blow molding device for forming a casing by expanding the preform into a shape along a cavity of the mold by feeding the preform into the preform,
Blow nozzle moving means for raising and lowering the blow nozzle along the axis of the preform;
After forming the casing, after raising the blow nozzle, a tray that moves forward directly below the blow nozzle above the cap that is supplied to the mouth tube portion of the casing , and
The blow nozzle may, blow molding apparatus having a cap attachment means for fixing and holding the mouth tube portion of the該壜body the cap which seals the bottle body upon lowered by operation of the blow nozzle moving means.   2. The blow molding apparatus according to claim 1, wherein the cap attaching means is a front end portion of the blow nozzle that abuts on an upper surface of the cap and pushes the cap into a mouth tube portion of the housing.   The blow molding apparatus according to claim 2, wherein the cap has a concave portion that is open upward, and a tip portion of the blow nozzle has a protrusion that fits into the concave portion and positions the cap.   The blow molding apparatus according to claim 2, wherein a front end portion of the blow nozzle pushes an upper surface of the cap through the tray.   2. The blow molding apparatus according to claim 1, wherein the cap attaching means is a rotating portion of the blow nozzle that is provided so as to be rotatable around a center axis of the blow nozzle and that screwes the cap into a mouth tube portion of the casing.

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