JP5904255B1 - Blow molding apparatus and blow molding method - Google Patents

Abstract

Good handling of a molded product is obtained at the time of taking out from a blow mold and in the subsequent steps. A blow molding apparatus (1) holds a pair of parison chucks (2) gripping the upper and lower parts of the parison (P) and the parison (P) gripped by the pair of parison chucks (2) between the pair of parison chucks (2). A blow device 4 for inserting a blow nozzle 40 into the parison P sandwiched by the blow mold 3 via the blow mold 3 and one chuck 2U of the pair of parison chucks 2 and opening of the blow mold 4 After that, a take-out device 5 that receives the molded product M held by the pair of parison chucks 2 from the pair of parison chucks 2 is provided. [Selection] Figure 1

Description

  The present invention relates to a blow molding apparatus and a blow molding method for obtaining a molded product from a hollow parison by blow molding.

  In general blow molding, a hollow parison is sandwiched between a pair of blow molds, a blow nozzle (or blow pin) is inserted into the sandwiched parison and blown air is blown into a hollow mold corresponding to a cavity in the blow mold. After forming the molded product and cooling and exhausting the blow mold, the mold is opened and the molded product is taken out from the blow mold.

  In the prior art described in the following Patent Document 1, a parison continuously discharged from a die head is gripped and divided by a pair of blow molds, and then blow pins (blow nozzles) are driven from below the blow mold into the parison. Blow in. At that time, the burrs protruding from the upper part of the blow mold were gripped by the chuck of the molded product take-out device, and after the blowing into the parison and the exhaust processing were completed, the burrs connected to the molded product were gripped by the chuck described above. In the state, the mold is opened and the blow pin is pulled out.

Japanese Patent Laid-Open No. 10-323887

  According to the above-described prior art, since the burr protruding from the upper part of the blow mold is held by the chuck, it is difficult to reliably hold it, and the molded product cannot be held in a stable state after the mold is opened. Therefore, there is a problem that good handling of the molded product cannot be obtained at the time of taking out from the blow mold and the subsequent process. In addition, since a burr is removed from the molded product, another process is required after the removal, and there is a problem that the removal and collection of the burr are complicated.

  Furthermore, since the blow pin (blow nozzle) is directly inserted into the parison sandwiched between the blow molds, the opening of the parison tends to be blocked, and the parison opening sandwiched between the blow molds There is a problem that a blow pin (blow nozzle) cannot be reliably inserted.

  This invention makes it an example of a subject to cope with such a problem. That is, at the time of taking out from the blow mold and subsequent processes, obtaining good handling of the molded product, removing and collecting burrs from the molded product reliably and easily, and being sandwiched by the blow mold An object of the present invention is to perform a highly accurate blow process by inserting a blow nozzle into a parison reliably.

  In order to achieve such an object, a blow molding apparatus and a blow molding method according to the present invention have the following configurations. It should be noted that “upper” and “lower” in the configuration of the present invention may be upside down, and are not limited to the upper and lower sides, and indicate one or the other in the longitudinal direction of the parison.

A pair of parison chucks for gripping the upper and lower parts of the parison, a blow mold for clamping the parison gripped by the pair of parison chucks between the pair of parison chucks, and one of the pair of parison chucks through the chuck, and a blowing device for inserting a blow nozzle into the parison sandwiched by the blow mold, said one chuck is provided with an opening for gripping without closing the one opening of the parison The blow nozzle is inserted into the opening .

  A mold clamping step of clamping a parison gripped by a pair of parison chucks with a blow mold between the pair of parison chucks, and through the one chuck of the pair of parison chucks, A blow nozzle insertion step of inserting a blow nozzle of a blow device into a parison sandwiched between molds, and a blow air from the blow nozzle to the parison in the blow mold while the parison is gripped by the pair of parison chucks A blow step for blowing, an exhaust step for drawing out the blow nozzle from the blow mold and exhausting the blow mold, and a molded product held by the pair of parison chucks after the blow mold is opened Having a take-out step of delivering the product from the pair of parison chucks to the take-out device, Blow molding process that.

  According to the blow molding apparatus and the blow molding method having such characteristics, good handling of the molded product can be obtained at the time of taking out from the blow mold and in the subsequent processes, and removal / recovery of burrs from the molded product. Can be performed reliably and simply, and a blow nozzle can be reliably inserted into the parison sandwiched between the blow molds to perform highly accurate blow processing.

It is explanatory drawing which showed the blow molding apparatus and blow molding method which concern on embodiment of this invention ((a) is a clamping process, (b) is a blow nozzle insertion process / blow process, (c) is an exhaust process, taking out. Shows the process.) It is explanatory drawing ((a) which shows one chuck | zipper and (b) has shown the other chuck | zipper) which showed the parison chuck in embodiment of this invention. It is explanatory drawing which showed the specific example of the exhaust process of the blow molding method which concerns on embodiment of this invention. It is explanatory drawing which showed the specific example of the taking-out process of the blow molding method which concerns on embodiment of this invention. It is explanatory drawing which showed the other structural example of the blow molding apparatus which concerns on embodiment of this invention.

  Hereinafter, a blow molding apparatus and a blow molding method according to an embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, a blow molding apparatus 1 according to an embodiment of the present invention includes a pair of parison chucks 2 (one chuck (upper chuck) 2U and the other chuck (lower chuck) 2D), a blow mold 3 , A blow device 4 and a take-out device 5 (one take-out portion 5U and the other take-out portion 5D).

  The pair of parison chucks 2 includes one chuck 2U that grips the upper part of the parison P and the other chuck 2D that grips the lower part of the parison P. One chuck 2U includes an opening 2a that grips one opening of the parison P without closing the opening. FIG. 2 shows an example of the configuration. As shown to (a), one chuck | zipper 2U in a pair of parison chuck | zipper 2 hold | grips the parison P on both sides of the right side chuck piece 20R and the left side chuck piece 20L with the right side chuck piece 20R and the left side chuck piece 20L. The opening 2a described above is formed by combining the provided recesses 2p. In the illustrated example, one chuck 2U is an upper chuck.

  Further, as shown in (b), the other chuck 2D of the pair of parison chucks 2 is also gripped with the parison P sandwiched between the right chuck piece 21R and the left chuck piece 21L in the same manner as the one chuck 2U. In the illustrated example, the other chuck 2D is a lower chuck. The pair of parison chucks 2 (one chuck 2U and the other chuck 2D) perform a gripping operation and a conveying operation by the chuck operation units 22U and 22D, respectively.

  The blow mold 3 holds the parison P held by the pair of parison chucks 2 (one chuck 2U and the other chuck 2D) between the pair of parison chucks 2. Even after the parison P is clamped by the blow mold 3, the gripping of the parison P by the pair of parison chucks 2 is continued.

  The blow device 4 includes a blow nozzle 40 that is inserted into the parison P sandwiched by the blow mold 3 via one chuck 2D of the pair of parison chucks 2. Since one chuck 2U includes an opening 2a that holds the parison P without blocking one opening, the blow nozzle 40 is inserted into the opening 2a. The blow nozzle 40 is reliably inserted into the parison P sandwiched by the blow mold 3 by being inserted into the blow mold 3 through the opening 2a of one chuck 2U.

  The take-out device 5 includes one take-out portion 5U and the other take-out portion 5D that receive the molded product M gripped by the pair of parison chucks 2 after the blow mold 3 is opened from the pair of parison chucks 2. .

  The process of the blow molding method by such a blow molding apparatus 1 is demonstrated. A parison P continuously discharged from a die head (not shown) is gripped by a pair of parison chucks 2 and separated by a length corresponding to the blow mold 3. As shown in FIG. 1A, the parison P, the upper and lower portions of which are gripped by the pair of parison chucks 2, is sandwiched between the pair of parison chucks 2 by the blow mold 3 (clamping process). The parison P whose upper and lower portions are gripped by the pair of parison chucks 2 is accurately positioned at a predetermined position of the blow mold 3.

  Next, as shown in FIG. 1B, the blow nozzle 40 of the blow device 4 is inserted into the parison P sandwiched between the blow molds 3 through one chuck 2U of the pair of parison chucks 2 ( (Blow nozzle insertion process), blow air is blown from the blow nozzle 40 into the parison P in the blow mold 3 while maintaining the state in which the parison P is gripped by the pair of parison chucks 2 (blow process).

  Thereafter, as shown in FIG. 1 (c), the blow nozzle 40 is pulled out from the blow mold 3 to exhaust the blow mold 3 (exhaust process). After the blow mold 3 is opened, a pair of parisons The molded product M held by the chuck 2 is transferred from the pair of parison chucks 2 to the take-out device 5 (take-out step).

  According to the blow molding method using such a blow molding apparatus 1, the parison P or the molded product M is always a pair of upper and lower parison chucks 2 from the mold clamping process through the blow process to the removal process after the mold opening. Is gripped by. Accordingly, the parison P can be accurately positioned on the blow mold 3 and the molded product can be held in a stable state when the mold is opened. At the time of taking out from the blow mold 3 and in the subsequent steps Good handling of the molded product M can be obtained.

  Further, since the blow nozzle 40 is inserted into the parison P sandwiched between the blow molds 3 through the one chuck 2U that grips without closing one opening of the parison P, the parison P is sandwiched between the blow molds 3. The blow nozzle 40 can be surely inserted into the parison P to perform a highly accurate blow process.

  As a more characteristic configuration, the blow molding apparatus 1 includes an overstretching unit that stretches and molds a part of the parison P along one chuck 2U. In the example shown in FIG. 1, as the overhang forming means, the blow device 4 includes an overhang forming portion 41 that press-molds a part of the parison P between the upper surface of one chuck 2U.

  By providing the blow device 4 with the overhang forming portion 41, as shown in FIG. 1B, in the blow nozzle insertion step, the parison P between the upper surface of one chuck 2U and the over stretch forming portion 41 of the blow device 4 is used. A part of this is press-molded to form a flange-like overhanging portion Pf. By molding such an overhanging portion Pf, as shown in FIG. 1C, the molded product M after the mold opening can be stably held by the pair of parison chucks 2. It can be reliably delivered to the take-out device 5.

  FIGS. 3A to 3C show specific examples of an exhaust process in which the blow nozzle 40 is pulled out from the blow mold 3 to exhaust the blow mold 3 (the parts common to the above description are the same). The same reference numerals are assigned and the duplicate description is omitted). In these examples, the blow nozzle 40 is pulled out from the blow mold 3 immediately after the blow process is completed, so that the air in the molded product such as the bottle is released without exhausting the valve, such as the solenoid valve. The subsequent blow mold 3 can be quickly exhausted, and the efficiency of the molding cycle can be increased by shortening the exhaust time. Here, an example of forming a bottle will be described.

  The specific example of FIG. 3A shows a simple basic configuration. After the air supply side valve a is opened to increase the pressure in the blow mold 3, the exhaust side valve b is opened to open the blow mold. Air is circulated in the mold 3 to cool the bottle from the inside.

  In the specific example of FIG. 3B, the blow nozzle 40 has a double circular tube structure, the valve a on the air supply side is opened, and the pressure in the blow mold 3 is increased by air supply from the central nozzle 42. The valve b on the exhaust side is opened, air is circulated in the blow mold 3 through a flow path formed by the central nozzle 42 and the outer peripheral nozzle 43, and the bottle is cooled from the inside. As described above, the blow nozzle 40 has a double circular tube structure, and an exhaust flow indicated by an arrow in the figure is formed to efficiently circulate air, thereby shortening the cooling time.

  The specific example of FIG.3 (c) makes the center nozzle 42 which comprises the double tube structure of the blow nozzle 40 of FIG.3 (b) the rod 42a which can be raised / lowered, and the bottom part of the bottle by the rod 42a tip is shown. Cooling and cooling of appropriate parts such as the body part and the mouth part of the bottle by the horizontal hole of the rod 42a are enabled. In the specific examples of FIGS. 3A to 3C, the exhaust is quickly performed by pulling out the blow nozzle 40 from the blow mold 3 as described above.

  FIG. 4 shows a specific example of the extraction process by the extraction device 5 (the same parts as those described above are denoted by the same reference numerals, and redundant description is omitted). In the take-out process, one chuck 2U grips the flange-shaped projecting portion Pf formed on the upper part of the molded product M, and the other chuck 2D grips the burr Mb formed on the other of the molded product M. In this state, one take-out unit 5U of the take-out device 5 receives the molded product M held by one chuck 2U, and the other take-out unit 5D of the take-out device 5 receives the other chuck of the pair of parison chucks 2. The burr Mb gripped by the 2D is received. In this way, when the take-out device 5 receives not only the molded product M but also the burr Mb, the removal and recovery of the burr Mb from the molded product M can be performed reliably and easily.

  FIG. 5 shows another configuration example of the blow molding apparatus according to the embodiment of the present invention (the same parts as those described above are denoted by the same reference numerals, and redundant description is omitted). In this example, the blow mold 3 includes the above-described overhang forming means. That is, as an overhang forming means, the blow mold 3 includes an overhang forming portion 30 that blow-molds a part of the parison P between the lower surface of one chuck 2U.

  In this example, as described above, in the blow nozzle insertion step, a part of the parison P is press-formed between the upper surface of one chuck 2U and the overhang forming portion 41 of the blow device 4 to form a flange-like overhang portion Pf. Is molded. In the blowing step, a part of the parison P is blow-molded between the lower surface of one chuck 2U and the overhang forming portion 30 of the blow mold 3 to form a flange-like overhang portion Pf1. In this way, by forming the projecting portion Pf1 along the lower surface of the one chuck 2U, the one chuck 2U can hold the molded product M more stably. Here, an example is shown in which both the overhang portions Pf and Pf1 are formed. However, the overhang forming portion 41 of the blowing device 4 may be omitted, and only the overhang portion Pf1 may be formed.

  As described above, according to the blow molding apparatus 1 or the blow molding method according to the embodiment of the present invention, good handling of the molded product M can be obtained at the time of taking out from the blow mold 3 and in the subsequent steps. Further, the removal and recovery of the burr Mb from the molded product M can be performed reliably and easily. Further, the blow nozzle 40 can be surely inserted into the parison P sandwiched between the blow molds 3 to perform highly accurate blow processing.

  As described above, the embodiments of the present invention have been described in detail with reference to the drawings. However, the specific configuration is not limited to these embodiments, and the design can be changed without departing from the scope of the present invention. Is included in the present invention. In addition, the above-described embodiments can be combined by utilizing each other's technology as long as there is no particular contradiction or problem in the purpose and configuration.

1: blow molding equipment,
2: Parison chuck, 2U: One chuck, 2D: The other chuck,
20R, 21R: right chuck piece, 20L, 21L: left chuck piece,
22U, 22D: chuck operation part,
2a: opening, 2p: recess,
3: Blow mold, 30: Overhang molding part,
4: Blow device, 40: Blow nozzle,
41: Overhang molding part,
42: central nozzle, 42a: rod, 43: outer peripheral nozzle,
5: take-out device, 5U: one take-out part, 5D: the other take-out part P: parison, Pf, Pf1: overhang part, M: molded product, Mb: burr

Claims (11)

A pair of parison chucks holding the upper and lower parts of the parison,
A blow mold for holding the parison gripped by the pair of parison chucks between the pair of parison chucks;
Said pair of through one of the chuck parison chuck, and a blowing device for inserting a blow nozzle into the parison sandwiched by the blow mold,
The blow molding apparatus according to claim 1, wherein the one chuck includes an opening for gripping without closing one opening of the parison, and the blow nozzle is inserted into the opening .   The blow molding apparatus according to claim 1, further comprising an overmolding unit that overmolds a part of the parison along the one chuck.   The blow molding apparatus according to claim 2, wherein the blow molding device includes a stretch molding unit that press-molds the parison with a part of the parison between the chuck and the one of the chucks.   The blow molding apparatus according to claim 2 or 3, wherein the overmolding means includes an overmolding unit that blow-molds a part of the parison with the one chuck. A take-out device for receiving a molded product held by the pair of parison chucks after the blow mold is opened from the pair of parison chucks;
The extraction device includes a receiving unit for receiving the molded article the one chuck to grip, according to claim 1-4 in which the other of the chuck of said pair of parison chuck, characterized in that it comprises a receiving unit for receiving a burr grasped The blow molding apparatus of any one of Claims. The one chuck, blow molding apparatus according to any one of claims 1 to 5 which is an upper chuck. A mold clamping step of clamping the parison gripped at the upper and lower portions by a pair of parison chucks with a blow mold between the pair of parison chucks;
A blow nozzle insertion step of inserting a blow nozzle of a blow device into a parison sandwiched between the blow molds through one chuck of the pair of parison chucks;
In a state where the parison is gripped by the pair of parison chucks, a blow step of blowing blow air from the blow nozzle into the parison in the blow mold,
An exhausting step of pulling out the blow nozzle from the blow mold and exhausting the blow mold;
A blow molding method comprising: taking out a molded product held by the pair of parison chucks after the blow mold is opened from the pair of parison chucks to a take-out device. 8. The blow molding method according to claim 7 , wherein, in the blow nozzle insertion step, a part of the parison is stretched and molded between the one chuck and the stretched molding part of the blowing device. The blow molding method according to claim 7 or 8 , wherein, in the blow step, a part of the parison is stretched and molded between the one chuck and the stretched molding part of the blow mold. In the unloading step, the pair of receiving portions of the unloading device receives a molded product held by the pair of parison chucks, and the one receiving portion of the unloading device receives one chuck of the pair of parison chucks. The blow molding method according to any one of claims 7 to 9 , wherein a burr to be gripped is received. The blow molding method according to claim 7 , wherein the one chuck is an upper chuck.

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