WO1998003324A1

WO1998003324A1 - Biaxial orientation molding machine

Info

Publication number: WO1998003324A1
Application number: PCT/JP1997/002568
Authority: WO
Inventors: Saburo Suzuki; Masanobu Seki; Hidehiko Fukai
Original assignee: Frontier, Inc.
Priority date: 1996-07-24
Filing date: 1997-07-24
Publication date: 1998-01-29
Also published as: CN1198126A; TW436412B; JP3817270B2; KR20000064270A; KR100452714B1; CN1074708C

Abstract

A biaxial orientation molding machine (1) is constructed such that supplying and heating of preforms, biaxial orientation molding and a recovering action of molded products are successively carried out by conveying a preform carrier pallet (7) along a conveying path (6) having a closed configuration. The conveying path (6) is a three-dimensional one such that a second conveying path portion (64) for returning to a preform supplying unit (2) a preform, which is made empty after taking out of a molded product, is formed at a much lower position than a first conveying path portion (62), in which heating and biaxial orientation molding are carried out. The second conveying path portion (64) is allowed to pass beneath an underside of a clamping mechanism (41) of a biaxial orientation molding section (4) and is therefore made linear. Accordingly, it is possible to shorten the entire length of the conveying path, realize small sizing and compactness of the machine and to improve a processing efficiency.

Description

Description Biaxial stretching machine Technical field

The present invention relates to a biaxial stretching molding machine suitable for molding a PET bottle or the like. More specifically, the present invention relates to a biaxial stretching molding machine that can be configured to be small and compact. Background art

A molded article such as a PET bottle can be obtained by heating a preform formed by injection molding and then stretching using a biaxial stretching mold. The biaxial stretching molding machine used for this purpose is configured to perform the molding operation by sequentially transporting the preforms at a constant feed bit through each processing section arranged along the transport path. I have. An example of this type of biaxial stretching molding machine is disclosed, for example, in Japanese Patent Publication No. 1-178555.

In the biaxial stretch molding machine described in this publication, the preform transport line is rectangular, and a rectangular parallelepiped transport line is placed on this line.

An SO unit (former 'carrier' palette) is arranged, and these are sequentially conveyed by a fixed feed bit. Each transport unit has an insert core that can be inserted into the mouth of the preform, and the preform is transported with the mouth inserted into the insert core. After receiving the preform, each transport unit goes through a heating section and a stretch forming section.

After the product has been conveyed to the collection section and returned to the preform supply section, it is repeatedly emptied.

The preform is carried along such a closed-shaped transfer line. The biaxial stretching machine configured to carry the preform 'carrier' pallet and perform the biaxial stretching operation has the following problems to be solved.

First, the preform, carrier 'pallet is returned to the preform supply section after the molded article is removed after passing through the heating section and the stretch forming section. The stretch forming section has a mold that opens and closes in a direction perpendicular to the transport line, and it is necessary to secure a space for the stroke of the mold on both sides. For this reason, the width of the stretch forming section is much larger than that of other parts in the biaxial stretching molding machine. Conventionally, the transport path is a planar transport path formed at the same height, and the portion of the transport path from the stretch forming section to the preform supply section is outside the wide horizontal stretch forming section. It is a road that bypasses the road. As a result, there is an adverse effect that the dimensions of the biaxial stretching molding machine become large. In addition, the overall length of the transport path becomes longer, and accordingly, it takes a longer time to cycle the preform, carrier, and pallet along the transport path, resulting in a reduction in processing speed.

Second, the preform is inserted into the preform 'carrier' knurl, which is conveyed via the preform supply unit, by inserting its mouth from above into the insert core. Attached to the If the mouth of the preform is not firmly inserted into the insertion core, the subsequent processing will be appropriate (it will not be performed. However, the reason for not being surely inserted is that it is simply insufficient insertion and In some cases, the mouth part is deformed and cannot be inserted, and no mechanism has been proposed so far to identify and properly handle them.

Third, in the stretch molding section, blow air is blown into the mouth of the preform carried on the preform 'carrier' palette. The core and the extension opening are inserted, and biaxial stretching of the preform is performed. It is preferable that the movement of the core and the stretching port can be performed more efficiently than the conventional mechanism because the processing efficiency is improved. s Disclosure of the invention

An object of the present invention is to provide a compact and compact biaxial stretching machine with a shortest conveying path in view of the above points. Another object of the present invention is to provide a biaxial stretch molding having a function capable of reliably identifying deformation and insertion failure of a preform supplied to a preform-carrier * no from a preform supply unit. The realization of the machine.

Further, an object of the present invention is to realize a biaxial stretch molding machine equipped with a mechanism capable of efficiently moving a blow air one blow-in port core and a stretch port in a stretch forming section.

In order to achieve the above object, the present invention provides a preform supply section, a preform heating section, a biaxial stretching section for biaxially stretching a preform after heating, and a collection section for collecting a molded article. In a biaxial stretching molding machine having a closed conveying path sequentially passing through these parts and a zo briform 'carrier' pallet conveyed along the conveying path, a preform is formed. By configuring the transport path of the 'carrier' pallet in a three-dimensional plane, the length of the transport path is minimized, thereby realizing compactness and compactness, and improving the processing efficiency.

That is, in the present invention, as the transport path, a first transport path portion that transports the preform 'carrier' pallet carrying a preform via the preform heating section and the biaxial stretch forming section. The preform, carrier, and nozzle after the molded article is recovered. And a second transport path portion for transporting the sheet to the preform supply section while bypassing the lower or upper side of the biaxial stretch forming section. As described above, by forming the transport path portion below or above the biaxially stretch-formed portion, the overall length of the transport path can be shortened as compared with a conventional planar transport path. Generally, it is sufficient to form a transport path portion that passes below the biaxially stretch-formed portion.

Here, when a transport path portion that passes under the biaxial stretch forming section is formed, an operation of lowering the preform 'carrier' pallet from the recovery section to the transport path section located below. By utilizing the above, a molded product extracting means for extracting the molded product inserted into the opening of the preform 'carrier' knurl from the pallet may be provided. Such a removing means can simply be a simple mechanism for holding the mouth of the molded article. That is, if the mouth of the molded product is gripped from both sides by the extracting means, the preform 'carrier-pallet itself descends, and the molded product is automatically pulled out from this pallet.

Also, in the biaxial stretching molding machine of the present invention, the preform's carriers and pallets are arranged in a line in the conveying direction in a portion of the first conveying path that passes through the heating section. The preform / carrier “pallet” in the heating section is transported in the state, and the length of the preform “carrier” pallet in the conveying direction is one piece. In this case, it is desirable to arrange a feeding means for making the feeding bit of each preform 'carrier' pallet delivered from the heating section to the biaxial stretching molding section wider than the feeding pitch at which the heating section is transported. . With this configuration, the feed pitch is increased in the biaxially stretched molded portion, so that a large-diameter molded product can be molded. The preform can be conveyed at a narrow feed pitch in the heating section. Therefore, the heating section The heating efficiency can be improved by increasing the array density of the preforms at the same time, and the required transport path can be shortened, thus realizing a compact device.

On the other hand, the biaxial stretch molding section of the biaxial stretch molding machine of the present invention is provided with a blow air blowing core inserted from the opening of the preform, and a driving means for independently inserting the stretching opening head. It has a configuration. With this configuration, the stroke of moving (generally moving up and down) the blow-air blowing core can be greatly reduced, and the time required for the movement can be shortened to improve the processing efficiency.

Further, in the biaxial stretching molding machine of the present invention, the preform supply unit and the heating unit are provided with a pressing means for inserting the preform into the core. By this pushing means, the preform can be securely carried on the preform / carrier 'nose' retlet.

Here, it is desirable that the pushing means has a configuration including a position sensor for detecting the height position of the preform after the pushing. Since the deformed mouthpiece cannot be pushed in, if the height position is detected after pushing, such a deformed defective preform can be reliably detected. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a schematic diagram showing the entire configuration of a biaxial stretching molding machine to which the present invention is applied.

FIG. 2 is a side view of a two-bow stretch forming machine to which the present invention is applied. FIG. 3 is a plan configuration diagram of the biaxial stretching molding machine in FIG.

FIG. 4 is a cross-sectional configuration diagram of a biaxial stretch molding section of the biaxial stretch molding machine of FIG. FIG. 5 is a perspective view of a preform carrier pallet in the biaxial stretching molding machine of FIG.

FIG. 6 is an explanatory diagram showing a feed mechanism for feeding the preform after heating in the biaxial stretch forming machine of FIG. 2 to the biaxial stretch forming section. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, an embodiment of a biaxial stretching molding machine to which the present invention is applied will be described with reference to the drawings.

FIG. 1 is a schematic diagram showing the overall configuration of a biaxial stretch molding machine of the present embodiment.

I o. 2 to 4 are a side view, a plan view, and a cross-sectional view of a biaxially stretch-formed portion of the biaxially stretch-formed machine of the present embodiment, respectively. Further, FIG. 5 is a perspective view of the preform / carrier pallet, and FIG. 6 is an explanatory view showing a feed mechanism for feeding the preform after heating into the biaxially stretched forming section. .

Referring to FIG. 1 to FIG. 4, the biaxially stretched molding 1 of the present embodiment includes a preform supply section 2 for supplying a preform P, a preform heating section 3, and a preform P after heating. A biaxial stretch forming section 4 for forming a biaxial stretch 1; a collecting section 5 for collecting a molded product P2; a closed conveying path 6 for sequentially using these parts; Road 6

It has a plurality of preforms 'carrier pallets 7' conveyed along 20.

The transport path 6 has a rectangular closed shape as shown by a thick line in FIG. 3, and the transport direction of the preform 'carrier' pallet 7 is indicated by an arrow. In this example, the transport path 6 is a first transport path section 6 for transporting the preform 'carrier' knowledge 7 carrying the preform P via the preform heating section 3 and the biaxial stretch forming section 4. 2 (the path from point A to point B in Fig. 3) and the molded product P 2 A second transport path section 6 4 for transporting the recovered preform, carrier, and pallet 7 to the briform supply section 2 through the lower side of the biaxially stretch forming section 4 (see FIGS. (Route from point C to point D in Fig. 3). As can be seen from FIGS. 1 and 4, the second transport path portion 64 is configured to pass through the lower position of the blow mold clamping mechanism 41 of the biaxial extension forming section 4.

Each of the transfer path portions 62 and 64 is a horizontal transfer path. Accordingly, the transport path portion on the preform supply side of these transport path portions is an ascending route portion 6 1 (from the lower second transport route portion 64 to the upper first transport route portion 62). The route from point!) To point A in Fig. 1 and Fig. 3). Conversely, the transport path portion on the molded product recovery side is a descending route portion 6 3 from the upper first transport route portion 62 to the lower second transport route portion 64 (FIGS. 1 and 3). Path from point B to point C).

As described above, in the biaxial stretching molding machine 1 of the present example, the transport path 6 of the preform is formed not three-dimensionally but three-dimensionally. Therefore, as compared with the case where the preform conveying path is formed so as to bypass the blow mold clamping mechanism 41 of the biaxial stretch forming section 4 in a planar manner as before, the machine space, particularly the width thereof, is increased. The dimensions can be greatly reduced. Therefore, compactness of the biaxial stretching machine can be realized. In addition, the overall length of the preform transport path can be significantly reduced, so that the cycle time for making a round of the preform 'carrier' pallet 7 can be significantly reduced, and processing efficiency can be improved.

Here, as shown in FIG. 5, the preform 'carrier' and 'plate 7 are a rectangular main body 71 and a rotating shaft 7 which penetrates the main body 71 in a vertically rotatable state. 2, a preform insertion core 73 formed coaxially on the upper end face of the rotating shaft 72, and a protrusion on the lower end side of the rotating shaft 72. It consists of external teeth 74 formed on the protruding part. A through hole 75 is formed at the center of the rotating shaft 72 and the insertion core 73. Under the through hole 75, a blow air blow-in port core can be inserted as described later. Further, the extension port can be inserted into the inside of the preform P1 on the upper side through the through-hole # 5.

The preform P is supplied to the preform 'carrier' pallet 7 reaching the point D from the preform supply unit 2 side. In other words, the mouth of the preform P that is waiting with the mouth facing upward is gripped by the swing gripper 22 that can swing around the axis 21.

, ο Next, when the gripper 22 turns 180 degrees about the axis 21, the mouth of the gripped briform P turns downward, and the preform just waiting at the point D ′ The carrier is inserted into the core 73 of the 'let 7.

In this way, the preform carrying the preform P

, ₅ Yaria 'palette 7, by a biaxial conveying mechanism 6 1 A, rises in the Z-axis direction together with movement in the Y-axis direction, it reaches the point A. The preform and the carrier 7 at the point A are pushed horizontally in the X-axis direction by the push rod 61B, and the first transport is performed from the two-axis transport mechanism 61A. Delivered to road section 62.

20 The first transport path portion 62 is provided with a pair of rails 62 a and 62 b on which the rectangular main body 71 of the Briform 'carrier-palette 7 slides. The pallet 7 riding on these rails moves along the transport path portion 62 each time the pallet 7 is extruded one by one by the push port 61B. In other words, this transport path portion 62

In 25, the feed pitch is defined by the length of the pallet 7 in the transport direction, and the pallets 7 arranged in a line for each feed bit are transported intermittently as a whole. Here, at a position near the point D in the first transport path portion 62, a pushing mechanism 8 for pushing the preform P downward is arranged. The pushing mechanism 8 is for pushing the preform P again into the insertion core 73 of the pallet 7. The pushing mechanism 8 includes a position sensor 8a for detecting the height of the preform 7 after the pushing. By the pushing mechanism 8, the preform P is securely inserted into the pallet 7, and is conveyed to the next heating unit 3. Further, when the preform P cannot be pushed in by the pushing mechanism 8, the height of the preform P becomes higher than that in the normal state, and this is detected by the position sensor. In this case, it is displayed or notified that the preform is a defective preform such as a deformed mouth portion of the preform P. Therefore, poor insertion of the preform P is eliminated, and at the same time, a defective preform P is detected.

Next, in the heating unit 3, heaters for heating the reform are arranged on one side along the transport path 62. The preform P is heated and rotated by a rotating mechanism 62 A composed of a driving bridge, a driven burley, and a timing belt bridged therebetween.

3 is conveyed. That is, when the timing belt meshes with the gear 74 of the bullet 7 and rotates the gear 74, the bullet rotating shaft 72 on which the gear 74 is integrally mounted rotates, The preform 7 inserted into the insertion core # 3 on the upper surface rotates. Next, the preform P1 that has been heated while rotating in the heating unit 3 is cooled for a certain period after passing through the heating unit 3, and is brought into a temperature state suitable for molding. Thereafter, it is carried into the biaxial stretch forming section 4. In this example, a feed mechanism 9 for feeding the pallet 7 carrying the heated preform P 1 one by one into the biaxial stretch forming section 4 is provided. Have. The feed mechanism 9 feeds the nozzles 7 one by one to the biaxial stretch forming section 4 one by one at a feed pitch wider than the feed bit in the heating section 3.

As shown in FIG. 6, the feed mechanism 9 is provided with a pair of grippers 91 and 92 at an interval of five beaches L2 in the transport direction. These grippers are configured to integrally reciprocate at a feed pitch of 2 in the transport direction. The pallet 7 that has passed through the heating unit 3 and has been transported at the feed pitch L1 to the point A1 is gripped by the Grino '92. In this state, the gripper 91 on the front side is located at the molding position A 2 in the biaxially stretched, o molded part 4.

After the completion of the biaxial stretch forming, the grippers 91 and 92 move at the feed pitch L2 in the transport direction. As a result, as shown by the solid line in FIG. 6, the pallet 7 gripped by the rear gripper 92 reaches the biaxially stretched molding position gA2, and the pallet on which the molded article is carried. The gripper 91 on the front side gripping the, ₅ reaches the point B. By repeatedly performing such reciprocating operation, the feed mechanism 9 conveys the pallet 7 sent at the feed pitch L1 to the biaxial extension unit 4 at a feed pitch L2 wider than that.

Since the feed pitch in the biaxial stretching section 4 is widened in this way,

20 Regardless of the feed pitch in the heating part 3, it is possible to mold a container with a large body diameter. Conversely, by reducing the feed bit in the heating section 3, the length of the heating section 3 in the transport direction is shortened, and the arrangement density of the preforms P in the heating section is increased, thereby increasing the heating efficiency. Can be increased. Thus, the length of the heating section in the transport direction can be shortened,

Z S The size of the biaxial stretching machine can be reduced accordingly.

The biaxial stretching molding machine 4 of this example is composed of a set of molding dies 42, this mold clamping mechanism 41, and blow-in air blown through the opening of the preform. And an extension rod 44 which is also inserted from the opening of the preform, and a drive mechanism 45 which independently performs the operation of inserting the blow air one-inlet core 43 and the extension rod 44. It has a configuration with.

At the time of molding, when the preform P is carried into the point A 2, the pair of left and right molding dies 42 is formed by the mold clamping mechanism 41. Thereafter, the blow-air blow-in port core 43 rises and is connected to the through hole 75 of the pallet 7, and the blow of the blow-off air into the preform P is started. At the same time, the extension rod 44 rises and is inserted into the preform through the pallet through hole 75. The biaxial stretching molding is performed by blowing air and inserting the stretching port 44. In this example, the boom-air blow-in core 43 with little up-and-down stroke and the extension port 4 with long up-and-down stroke can be individually driven. Therefore, the time required for raising and lowering the blow-air blow-in core 43 is significantly greater than in the conventional case where the blow-air blow-in core 43 is moved up and down by a large stroke together with the extension opening 44. Can be reduced and the processing efficiency can be improved.

Next, the molded product P2 obtained by the above-described biaxial stretching molding is transported to the point B by the above-described feed mechanism 9. At this point B, the pallet 7 is delivered to the two-axis transport mechanism 63A.

When the pallet 7 is delivered to the two-axis transport mechanism 63 A, the rotating gripper 5A of the molded product recovery section 5 grips the neck portion of the molded product P2 on the pallet. In this state, the biaxial transport mechanism 63A lowers the pallet 7 (moves in the Z-axis direction). As a result, the insertion core 73 on the side of the pallet 7 is pulled out from the mouth of the molded product P2. Thereafter, the turning gripper 5A turns to collect the molded product P2. Thus, in this example, the molded product P 2 is palletized by utilizing the descent by the biaxial transport mechanism 63 A. A extracting mechanism for extracting from the side 7 is configured. Therefore, the molded product P2 can be collected by a simple mechanism.

The two-axis transport mechanism 63A transports the pallet 7 emptied by lowering it toward the starting point C of the second transport path portion 64 (transports in the Y-axis direction 5). At the point C, the pallet 7 is pushed out in the X-axis direction from the side of the biaxial transport mechanism 63A by the bush rod 63B, thereby forming the second transport path portion 64. Ride on a pair of left and right conveyor belts 6 4 a and 6 4 b. The pallet 7 is conveyed toward the ο side of the preform supply unit 2 through the lower side of the mold clamping mechanism 41 of the biaxial extension forming unit 4 by these conveyance belts.

Thereafter, the pallet 7 is repeatedly moved in the transport path 6 in the same manner to perform the biaxial stretching of the preform.

(Other embodiments)

In the above example, in the biaxial stretch forming section 4, one set of forming molds is used.

It has a so-called one-piece configuration with ₅ . Alternatively, for example, a two-cavity configuration can be adopted. In this case, instead of the feed mechanism 9, a feed mechanism that transports the pallets 7 two by two may be employed. In this case, a mechanism for increasing the interval between the two pallets in conjunction with the transport operation may be provided.

z o

Industrial applicability

As described above, in the biaxial stretching molding machine of the present invention, since the transport path of the preform 'carrier' pallet is three-dimensionally configured, the whole can be configured to be small and compact.

25 In addition, in the present invention, by using the operation of lowering the preform / carrier / knurl along a three-dimensionally configured transport path, a molded article is formed from the preform / carrier / no. Because I try to extract The structure for removing such a molded product can be simplified.

Furthermore, since the feed pitch at the time of delivery to the biaxial stretching forming section is made wider than the feed pitch in the heating section of the preform, it is possible to form a thick molded product, and the preform in the heating section can be formed. The heating efficiency can also be improved because the array density of 5 um can be increased.

Furthermore, in the biaxial stretch forming section, since the blow air blow-in port core and the draw-out port are driven independently, the blow air blow-in port is lower than a mechanism in which these are driven integrally. Can be driven more efficiently.

On the other hand, according to the present invention, a mechanism for securely inserting the preform into the preform 'carrier' pallet is provided, and a position senna is attached to the pushing mechanism. According to this configuration, the defective preform in which the mouth portion is deformed can be reliably identified.

I can do it.

Claims

The scope of the claims

1. Preform supply section, preform heating section, biaxial stretching section for biaxially stretching the preform after heating, and collection section for collecting the molded product, and sequentially passing through these parts In a biaxial stretching molding machine having a closed conveying path to perform, and a preform 'carrier' pallet conveyed along the conveying path,

The conveying path is configured to transfer the preform carrier carrying the preform to the preform heating unit and the biaxial stretching unit.

A first transport path portion for transporting through the I0-shaped portion and the preform 'carrier' pallet after the molded product is collected, bypassing the lower side or the upper side of the biaxially stretched molded portion; A second transport path section for transporting to the preform supply section.

.

1 s

2. In claim 1, the second transport path portion is formed at a lower position than the first transport path portion, and passes under a mold clamping mechanism of the biaxial stretch forming section. A biaxial stretch molding machine.

2 0

3. In Claim 2, wherein the transport path receives the preform's carrier pallet from the first transport path portion and lowers the preform's carrier pallet at the collection portion side. A third transport path section for delivery to

25 Further, there is provided a molded product extracting means for extracting molded products from the preform, the carrier, and the pallet by using the descending operation of the preform, carrier, and pallet in the third transport path portion. A biaxial stretch molding machine.

4. In any one of claims 1 to 3, in the portion of the first transport path portion that passes through the heating section, the briform 'carrier',- The plates are conveyed in a state where they are arranged in a line in the conveying direction, and the feed pitch of each preform, carrier, and nozzle in the heating section is one preform, carrier, and pallet. A biaxial stretch molding machine characterized by being defined by the length in the conveying direction of the sheet.

o

5. The method according to claim 4, wherein a feed bit of each preform 'carrier' nozzle delivered from the heating section to the biaxially stretched forming section is wider than a feed pitch in the heating section. A biaxial stretch molding machine, comprising a feeder.

6. The method according to any one of claims 1 to 5, wherein the biaxially stretch-formed portion includes a blow-air-inlet core inserted through an opening of the preform, and an opening of the preform. A stretch rod inserted from above, and a drive means for independently performing an operation of inserting the blow-air one blow-in core and the extension draw-out rod independently.

7. In any one of claims 1 to 6, between the preform supply section and the heating section, a preform for pushing a briform into a pallet. A biaxial stretching molding machine, wherein a pushing means is arranged.

8. In Claim 7, wherein the pushing means includes a position sensor for detecting a height position of the preform after being pushed, and a defective preform can be detected based on the detected height position. A biaxial stretching molding machine characterized by the following.