JP5179252B2 - Core driving mechanism of preform plug crystallization device - Google Patents

Description

The present invention uses a preform holder over to hold the preform to heat-crystallized while exposing the mouth part having a support ring of the preform in the preform spout portion crystallizer, after heating The present invention relates to a core driving mechanism of a preform plug portion crystallization apparatus that drives a core into a plug portion of a preform.

  A thermoplastic resin container, particularly a thermoplastic polyester container typified by polyethylene terephthalate, is manufactured by biaxially stretching blow-molding a preform of a primary molded product manufactured by injection molding. The cap part of this container is not molecularly oriented in the biaxial direction by biaxial stretch blow molding like the body part, but remains in the molecular state in the preform. Deformation causes problems such as a decrease in the sealing performance of the screw portion and a loss of appearance due to thermal deformation. In order to prevent these harmful effects, the thermoplastic polyester container is given heat resistance by heating the stopper portion at the preform stage and crystallizing (whitening) it. In order to crystallize the plug part of the preform, the preform plug crystallization apparatus is used to prevent deformation of the plug part after heating while moving the preform held in the preform holder. The core is driven into the stopper, and then the preform is pulled out from the preform holder, and the core is removed from the preform.

  When the preform is held on the preform holder and the mouthpiece is crystallized using the preform mouthpiece crystallization device, the heat of the mouthpiece is prevented from escaping to the preform holder to ensure crystallization. In order to do this, it is desirable to heat the plug portion exposed. Conventionally, there has been a proposal for a preform holder that can be heated with the plug portion exposed. In an apparatus for crystallizing the neck of a preform made of thermoplastic polyester, a preform crystal is characterized in that a preform receiving member is built into the bottom of a cylinder holding the preform with the neck exposed. There is a preform holder in the conversion apparatus (see Patent Document 1). The preform holder can be crystallized by holding the bottom of the preform with a receiving member and heating it with the mouthpiece exposed. On the other hand, since the receiving member is urged upward by the pressing spring, the preform is pushed down against the urging force of the pressing spring when the core is driven into the preform, and the lower surface of the support ring is placed on the preform holder. The core can be driven in contact with the upper surface and the preform is supported by the preform holder, and displacement of the dimensional accuracy in the length direction of the preform due to the core driving is prevented.

Japanese Patent Publication No. 6-22876

  However, the above-described preform holder has a complicated structure because it is necessary to incorporate a receiving member at the bottom of the cylindrical body and to provide a pressing spring for urging the receiving member. In addition, the bottom of the preform is always in contact with the receiving member, and when the core is driven, the preform is pushed down against the urging force of the pressing spring, so that the urging force of the pressing spring acts on the bottom of the preform and There is a risk of affecting the dimensional accuracy in the length direction.

The present invention has been made in view of the above, using a pulp preform holder used in preform spout portion crystallization apparatus having a simple structure can be crystallized in a state of exposing the mouth part of the preform, flop Provided is a core driving mechanism for a preform mouth plug crystallization apparatus that can drive a core in a state where the bottom of the reform floats without coming into contact with a preform holder and does not affect the length direction of the preform. This is the issue.

The invention that solves the above-mentioned problems is a preform holder used in a preform plug crystallization apparatus that heats and crystallizes in a state where the plug portion having a support ring of the preform is exposed , and the upper portion is opened. A cylindrical outer holder that supports the preform at the bottom, and a cylindrical inner holder that is open at both ends inserted into the inner periphery of the outer holder. The inner holder is formed with a flange having a diameter larger than that of the support ring at the upper end, and when inserted into the outer holder, the upper portion is more than the upper end of the outer holder. is formed so as to protrude upward, when holding the preform, pulp remodeling host such formed a certain gap between the lower surface of the upper surface and the support ring of the collar portion It is a core driving mechanism of a preform plug part crystallizing device that heats the plug part while conveying a preform held by a drum and drives the core into the preform after heating, and the preform after heating The inner holder of the preform holder is moved upward to a position before the arcuate conveyance path for driving the core into the upper surface, the upper surface of the collar portion is brought into contact with the lower surface of the support ring of the preform, and A guide means for separating the bottom of the preform from the bottom of the outer holder of the preform holder, and an arcuate conveyance path having a wheel that rotates while supporting a lower surface of the flange contacting the support ring at the top. A sprocket that rotates in synchronization with the rotation and abuts against the support ring together with the wheel at a predetermined core driving position Supporting means for supporting the lower surface of the collar portion, the upper surface of the collar portion is in contact with the lower surface of the support ring, the stress acting downward by the driving of the core is received by the collar portion, and the The gist of the core driving mechanism of the preform plug crystallization apparatus is that the core can be driven in a state in which the bottom of the reform is floating from the bottom of the outer holder.

In the invention having the above-described configuration, a gap is formed between the collar portion of the inner holder and the support ring of the preform, so that heating and crystallization can be performed with the plug portion of the preform exposed. Further, since the inner holder can be moved upward, it is possible to the upper surface of the flange portion of the inner holder to abut against the lower surface of the support ring preform, or, support an upper surface of the flange portion of the inner holder by guide means The bottom of the preform can be brought into contact with the lower surface of the ring and can be floated away from the bottom of the outer holder of the preform holder. Also, when the core is driven, the core and the supporting means can receive the stress acting downward by the core by the collar, and the core can be driven with the bottom of the preform floating from the bottom of the outer holder. .

The core injection mechanism of the preform plug crystallization device allows crystallization with the preform plug exposed, preventing the escape of heat from the heated plug and making the plug efficient In addition, it can be reliably heated and crystallized, and a simple structure is advantageous in terms of cost. Further, the inner since the holder is movable upward, the upper surface of the flange portion of the inner holder at the time of driving of the core can be brought into contact with the lower surface of the support ring preform, or, on the inner holder of the preform holder The upper surface of the collar part is brought into contact with the lower surface of the support ring of the preform so that the downward stress caused by the core driving can be received by the collar part of the preform holder, and the bottom of the preform. Can be floated from the outer holder, so that the core can be driven in without affecting the dimensional accuracy in the longitudinal direction of the preform.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. As shown in FIGS. 1 and 2, the preform holder 30 includes an outer holder 10 and an inner holder 20. The outer holder 10 is configured by a cylindrical body having an upper portion opened and a bottom portion 11 supporting the preform P having a hemispherical shape. A ventilation hole 12 is provided in the center of the bottom 11. A step portion 13 corresponding to a locking means is formed above the inner periphery of the outer holder 10. A cooling fin may be formed on the outer periphery of the outer holder 10.

  The inner holder 20 is a cylindrical body that is open at both ends, and is inserted into the inner periphery of the outer holder 10. At the upper end of the inner holder 20, a flange 21 having a diameter larger than that of the support ring SR of the preform P is formed. When the inner holder 20 is inserted into the outer holder 10, the lower end thereof is locked to the step portion 13 of the outer holder 10. The inner holder 20 that is locked to the stepped portion 13 is formed in such a length that its upper portion projects upward from the upper end of the outer holder 10.

  The preform P held by the preform holder 30 includes a plug portion C having a support ring SR and a bottomed cylindrical portion T below the plug portion C, and is injected with a thermoplastic resin such as polyethylene terephthalate. Manufactured by molding.

  As shown in FIG. 1, the preform P is held by the preform holder 30, and when the bottom is supported by the bottom 11 of the outer holder 10, the preform P is fixed between the upper surface of the flange 21 and the lower surface of the support ring SR. The gap S1 can be formed. The gap S1 can be heated and crystallized using the preform plug crystallization device 150 with the plug portion C of the preform P exposed, so that the heat of the plug portion C is released to the preform holder 30. Crystallization can be reliably performed without this. Further, since there is a gap S1, the inner holder 20 locked to the stepped portion 13 can move upward, whereby the upper surface of the flange portion 21 can abut against the lower surface of the support ring SR.

  Next, the cooling core driving mechanism 100 of the preform plug crystallization apparatus 150 in which the preform holder 30 having the above configuration is used will be described.

  The preform P is carried and held from the inlet shown in FIG. 3 to the preform holder 30 arranged in the conveyance path 40 of the preform plug crystallization apparatus 150. The conveyance path 40 has a conventionally known configuration and is substantially the same as an arc-shaped conveyance path 60 described later in FIG. 4, and the preform holder 30 is inserted into a carrier 61 disposed in the conveyance path 40 and accommodated. . The carrier 61 is provided with a gear (not shown), and an endless moving chain 85 driven by a motor (not shown) is stretched over, so that the preform holder 30 moves in the conveyance path 40. The preform holder 30 is different from an arcuate conveyance path 60 described later in that the preform holder 30 moves along the conveyance path 40 while rotating around a rotation axis (not shown).

  A heating unit 50 having a conventionally known configuration is formed around the conveyance path 40. The heating unit 50 is provided with a heater that irradiates near-infrared rays and the like, and heats the plug portion C of the preform P being conveyed to crystallize. The heated preform P is conveyed to the cooling unit 55 and naturally cooled.

  The preform P, which has been naturally cooled after heating, is driven into the arc-shaped conveyance path 60 in order to drive the core 97 into the plug portion C, prevent deformation of the plug portion C, and ensure the shape of the inner diameter of the port.

  As shown in FIGS. 3 and 4, the core driving mechanism 100 includes a guide member 70 located in front of the arcuate conveyance path 60, a sprocket 80, and a support member 90 at the core driving position R. The arc-shaped transport path 60 has the same configuration as the transport path 40 described above except that the preform holder 30 does not rotate, and a moving chain in which the preform holder 30 is accommodated in a carrier 61 and driven by a motor (not shown). 85, the preform P is conveyed in an arc shape.

  As shown in FIGS. 4 and 5, the front position where the preform P is carried into the arcuate conveyance path 60 from the cooling unit 55 corresponds to guide means having a taper which gradually increases in the traveling direction on the upper surface. Guide members 70 are provided on both sides of the arcuate conveyance path 60. The guide member 70 includes a base plate 71 fixed to the base B, a support plate 72 erected on the base plate 71, a mounting plate 73 fixed to the support plate 72, and an upper portion of the mounting plate 73. The guide plate 74 is fixed to the guide plate 74 and the guide piece 75 is fixed to the upper portion of the guide plate 74, and the upper surface of the guide piece 75 is tapered. With the guide member 70 having this configuration, the inner holder 20 gradually moves upward in the traveling direction, and the upper surface of the flange portion 21 comes into contact with the lower surface of the support ring SR as shown in FIG. Further, since the difference in taper of the guide piece 75 is slightly wider than the gap S1 between the upper surface of the flange 21 and the lower surface of the support ring SR, as shown in FIG. The bottom portion of P can be separated from the bottom portion 11 of the outer holder 10, and the preform P can be held in the preform holder 30 in a state where it floats from the bottom portion 11 by a gap S2.

  A sprocket 80 that is driven by a motor (not shown) and drives an endless chain 85 to rotate in synchronization with the arcuate conveyance path 60 is formed in the arcuate conveyance path 60. As shown in FIGS. 4 and 6, a wheel 82 having a plurality of semicircular arc-shaped notches 81 is formed on the outer periphery of the sprocket 80, and a circular shape with the guide member 70 in contact with the support ring SR. The lower surface of the flange portion 21 of the preform holder 30 moving along the arcuate conveyance path 60 is supported in this state.

  As shown in FIGS. 4 and 6, the core driving position R is provided with a support member 90 corresponding to the support means. The support member 90 has substantially the same configuration as the guide member 70, and includes a base plate 91 fixed to the base B, a support plate 92 erected on the base plate 91, and an attachment fixed to the support plate 92. The plate 93 includes a guide plate 94 fixed to the upper portion of the mounting plate 93, and a guide piece 95 fixed to the upper portion of the guide plate 94. Although no taper is formed on the upper surface of the guide piece 95, a taper that gradually increases in the direction of travel from the transfer point (the left end of the guide piece 95 in FIG. 4) to the core driving position R is formed. It is good also as a structure which can be transferred smoothly. As described above, the support member 90 supports the lower surface of the flange portion 21 together with the wheel 82 at a position facing the wheel 82 when the core 97 is driven.

  As shown in FIG. 4, a core 97 is supplied from a core supply portion (not shown) provided with a lifting mechanism having a conventionally known configuration (not shown) from above the arcuate conveyance path 60. At the core driving position R, the preform P is supplied. Core 97 is driven into.

  The operation of the core driving mechanism 100 configured as described above will be described. The inner holder 20 is guided by the guide member 70 at a position before the arcuate conveyance path 60 and moves upward. The upper surface of the flange portion 21 is in contact with the lower surface of the support ring SR, and the bottom portion of the preform P is outside. The holder 10 floats away from the bottom 11 of the holder 10 by a gap S2. If it moves to the circular-arc-shaped conveyance path 60 in this state, the wheel 82 will be inserted in the lower surface of the collar part 21, and will support the lower surface of the collar part 21. FIG. When the preform P reaches the core driving position R, the core 97 lowered by the lifting mechanism with the wheel 82 and the support member 90 contacting the upper surface of the flange portion 21 and the lower surface of the support ring SR is plugged. Drive into part C. Accordingly, the downward stress due to the driving of the core 97 can be received only by the flange portion 21, and the bottom portion of the preform P is lifted from the bottom portion 11 of the outer holder 10 by the gap S2. No stress is exerted on the bottom of the P, and the core 97 can be driven without affecting the dimensional accuracy of the preform P in the longitudinal direction. Thereafter, the driven core 97 is pulled out from the preform P, and the preform P is carried out of the preform plug crystallization apparatus 150 from the outlet of FIG.

As long as it belongs to the technical scope, this invention can be embodied by changing various forms.
(1) The locking means is not limited to the configuration of the above embodiment as long as the inner holder can be locked. For example, a protrusion may be formed on the inner periphery of the outer holder as the locking means.
(2) The guide means or the support means has the configuration of the above embodiment as long as the upper surface of the collar portion is brought into contact with the lower surface of the support ring and the bottom portion of the preform is separated from the bottom portion of the outer holder. It is not limited.

The longitudinal cross-sectional view of the preform holder of embodiment which hold | maintains a preform and moves a conveyance path. The longitudinal cross-sectional view of the preform holder of embodiment which hold | maintains a preform and is guided with a guide member. The top view of the preform plug part crystallization apparatus of embodiment. (A) The top view which shows the core driving | operation mechanism of the preform plug part crystallization apparatus of embodiment. (B) The side view which shows the core driving | operation mechanism of the preform plug part crystallization apparatus of embodiment. FIG. 5 is a YY enlarged arrow view of FIG. FIG. 5 is an XX enlarged arrow view of FIG.

10 Outer holder
13 steps 20 inner holder 21 collar 30 preform holder 40 transport path 50 heating section 60 arc-shaped transport path 70 guide member 71 base plate 72 support plate 73 mounting plate 74 guide plate 75 guide piece 80 sprocket 81 notch 82 wheel 90 Support member 91 Base plate 92 Support plate 93 Mounting plate 94 Guide plate 95 Guide piece 97 Core 100 Core driving mechanism 150 Preform plug portion crystallizing device

Claims (1)

It is a preform holder used in a preform plug crystallization device that heats and crystallizes with the plug portion having a preform support ring exposed, with the top opening and the bottom supporting the preform. A cylindrical outer holder, and a cylindrical inner holder having both ends inserted into the inner periphery of the outer holder, the locking means for locking the lower end of the inner holder to the inner periphery The inner holder is formed with a flange having a diameter larger than that of the support ring at the upper end, and the upper part protrudes upward from the upper end of the outer holder when inserted into the outer holder. the time of holding the preforms, Purifo a constant gap is held to be in a pulp preform holder formed between the lower surface of the support ring and the upper surface of the flange portion This is a core driving mechanism for a preform plug crystallizing device that heats the plug portion while transporting the core and drives the core into the preform after heating, for driving the core into the preform after heating. The inner holder of the preform holder is moved upward to a position in front of the arcuate conveyance path so that the upper surface of the collar portion comes into contact with the lower surface of the support ring of the preform, and the bottom portion of the preform is moved to the preform. Rotating in synchronism with rotation of the arcuate conveying path having guide means for separating from the bottom of the outer holder of the reform holder, and a wheel that rotates while supporting the lower surface of the flange contacting the support ring at the top A sprocket and a support that supports the lower surface of the flange that contacts the support ring together with the wheel at a predetermined core driving position A step, the upper surface of the flange portion is in contact with the lower surface of the support ring, the downward stress due to the driving of the core is received by the flange portion, and the bottom portion of the preform is the bottom portion of the outer holder A core driving mechanism for a preform plug crystallization apparatus, characterized in that the core can be driven in a state where it floats from the top.

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