JPH0976338A - Preform temperature control device and blow molding method using the same - Google Patents

Abstract

(57) [Abstract] (Correction) [Problem] To increase the molding cycle by heating a preform by radiant heat and enabling local cooling by contact without pressing a part of the side wall of the preform inside the preform. (EN) Provided is a temperature control device for a preform capable of preventing the bottle from bursting or whitening during blow molding without any restriction on the temperature control time. SOLUTION: A heating block 34 having an inner wall surface spaced apart from and facing the outer surface of the preform 20 and being heated by heating means to heat the preform 20 by radiant heat.
a, 34b, 34c, 34d, and a cooling block 36 for locally cooling a part of the side wall 24 of the preform 20. The cooling block 36 is disposed so as to be movable back and forth with respect to the preform 20, and can be brought into contact with and separated from the side wall 24 of the preform 20 by a drive mechanism.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a preform temperature control device and a blow molding method using the same, and more particularly to a preform temperature control device capable of locally cooling a part of a side wall of the preform. The present invention relates to an apparatus and a blow molding method using the apparatus.

[0002]

BACKGROUND ART Generally, when a tubular preform with a bottom is blow-molded, a temperature control process is performed on the preform in a temperature control unit before the blow molding.

In this temperature control section, it is known that a preform is inserted into a temperature control pot and the temperature control pot is heated to perform temperature control processing on the preform.

When the temperature control pot is used to perform the temperature control process, the temperature control block is heated with the inner wall surface of the temperature control block forming the temperature control pot separated from the outer surface of the preform. When the temperature of the reform is controlled by radiant heat from the temperature control block, or the preform is inserted into a heated temperature control pot and blow air is introduced into the preform to perform pre-blow molding. There is a case where the outer surface of the preform is brought into close contact with the inner wall surface of the heated temperature control pot to control the temperature of the preform.

By the way, in blow molding, there is a case where a part of the side wall of the preform is desired to be locally cooled, for example, to locally change the wall thickness of the container.

As a case where it is desired to locally cool a part of the side wall of such a preform, for example, when an insert piece such as a handle or a suspender is blow-molded integrally with a container, an engaging portion of the insert piece is used. When the resin is wrapped around and engaged with the resin, a part of the preform may be locally cooled in order to secure the wall thickness and the amount of heat retained in that region.

The same problem also occurs when a part of the cavity surface of the blow cavity type has a concave or convex step in which the resin is difficult to stretch along the shape, and the concave or convex step causes the same problem. In some cases it may be desirable to locally cool the corresponding preform area.

Further, in the case of molding a flat-shaped container having a different stretch ratio in the circumferential direction, the wall thickness in the direction having a high stretch ratio may be extremely thin, and whitening may occur in some cases. In order to prevent the state, there is a case where it is desired to locally cool the preform side wall in the direction in which the stretch ratio is high.

As described above, when a part of the side wall of the preform is locally cooled, it is advantageous in terms of cooling efficiency to use the cooling means by contact.

Therefore, the applicant of the present invention has proposed a blow molding method in which a cooling block is brought into contact with a part of a preform to perform local cooling in a temperature control step before the blow molding step (Japanese Patent Laid-Open No. 6-58242).
No. 64027) was previously proposed.

In this blow molding method, after the temperature of the preform is adjusted by the temperature adjustment pot in the temperature adjustment step, the preform is taken out from the temperature adjustment pot and a cooling block provided separately from the temperature adjustment pot is inserted. Local cooling is performed by contacting a part of the reform.

Further, a heating block for heating by non-contact radiant heat is arranged in a portion of the preform where a high adjustment temperature is required, and a temperature for performing a temperature adjustment by contact in a portion where a lower adjustment temperature is required. A temperature adjusting device in which a temperature adjusting block is arranged so that a portion of the preform having a large draw ratio and requiring a high adjusting temperature can be quickly heated without causing deformation or damage due to contact (Japanese Patent Publication No. 6-4.
9329) has also been previously proposed.

In this temperature adjusting device, the preform is brought into contact with the temperature control block by applying an internal pressure to the preform.

[0014]

In the case where the cooling block provided separately from the above-mentioned temperature control pot is used to locally cool the preform, the temperature of the preform is adjusted after the temperature control. A process such as removing from the pot and then raising the cooling block to contact the preform is required, and the time required for the temperature control process becomes longer, the molding cycle becomes longer, or the temperature control time is restricted. In addition, an elevating mechanism for the cooling block and the like are required, which increases the number of parts and the manufacturing cost.

When the heating block and the temperature control block are combined and the heating block heats the preform by radiant heat without contact, and the temperature control block controls the temperature of the preform by contact, the temperature control block is cooled. By doing so, it is possible to perform local cooling, but the part heated by the heating block also swells due to the internal pressure to bring the preform into contact with the temperature control block, melts by contacting the heating block, and scratches. May be attached.

Therefore, according to the present invention, while heating the preform by radiant heat, it is possible to locally cool a part of the side wall of the preform by contact without pressurizing the inside of the preform, and without lengthening the molding cycle, and An object of the present invention is to provide a temperature control device for a preform that can prevent the bottle from bursting or whitening during blow molding without limiting the temperature control time.

Another object of the present invention is to ensure contact cooling by absorbing an error at the time of contact when a plurality of containers are simultaneously molded, a mounting error, or a change in contact position due to shrinkage of the preform. It is to provide a temperature control device for a preform.

Still another object of the present invention is to minimize the ascending / descending portion when elevating and lowering the temperature control device having a cooling means for contacting and separating from the preform with respect to the preform.

Further, another object of the present invention is to perform blow molding of containers having different stretching ratios in the circumferential direction,
This is to ensure that the container shape can be molded.

Another object of the present invention is to provide a blow molding method capable of efficiently cooling the preform when the preform is cooled in the temperature control step and improving the molding efficiency.

[0021]

In order to achieve the above-mentioned object, the invention according to claim 1 is a temperature control section for performing a temperature control process on a preform having a bottomed cylindrical shape before blow molding. A temperature control device for the preform arranged in, having an inner wall surface facing the outer surface of the preform with a space, and a heating block that is heated by heating means to heat the preform by radiant heat, A cooling block that is combined with the heating block and that is cooled by cooling means to locally cool a part of the side wall of the preform, wherein the cooling block is arranged so as to be movable back and forth with respect to the preform. It is characterized in that it can be brought into and out of contact with the side wall of the preform by a driving means.

According to the first aspect of the present invention, the temperature of the preform is controlled by the radiant heat of the temperature control block, and
By bringing the cooling block into contact with the side wall of the preform by the driving means, it is possible to reliably and efficiently locally cool a part of the side wall of the preform without melting or damaging the preform. You can

By providing the cooling block in combination with the heating block, the heating time of the preform is not limited, and is advantageous in terms of time as compared with the case where the cooling block is separately provided and cooled. can do.

Further, it can be easily obtained by modifying the existing temperature control pot and combining the cooling blocks. Moreover, when a cooling block is separately provided, it is not necessary to additionally provide an elevating mechanism for the cooling block and the like. The number of points and the manufacturing cost can be reduced.

According to a second aspect of the present invention, in the first aspect, the heating block is arranged in an upper portion and a lower portion,
The cooling block is arranged between the upper and lower heating blocks.

According to the second aspect of the present invention, the upper and lower heating blocks are left, and the heating block corresponding to the cooling block is replaced with the cooling block. The block can reliably control the temperature below the neck of the preform, which is generally difficult to stretch during blow molding, and the lower heating block reliably heats the vicinity of the bottom of the preform. be able to. Especially when the handle is provided, the cooling block at the intermediate position locally cools the intermediate portion of the side wall of the preform, so that the engaging portion of the handle is engaged in the intermediate portion of the body portion of the container. The thickness of the preform can be ensured, and the preform can be surely allowed to wrap around the engaging portion of the handle due to the holding temperature thereof, and the rupture of the container can be reliably prevented.

The third aspect of the present invention is the first or second aspect.
In the above-mentioned, the cooling block has a cushion means for urging the cooling block toward the preform side by an elastic member shape to secure a contact state when the cooling block is in contact drive with the preform. .

According to the third aspect of the present invention, even if there is a slight error in the mounting position of the cooling block, the cushion means can reliably absorb the error, and further, at the time of temperature control. Even when the position of the outer surface of the preform slightly changes due to contraction of the preform, the change can be reliably followed. In addition, even if there are some errors in the position of each preform with respect to the multiple preforms that were simultaneously conveyed to the temperature control section when molding multiple containers at the same time, the cushioning means absorbs the errors. Then, each cooling means can be surely brought into contact with a plurality of preforms.

According to a fourth aspect of the present invention, in any one of the first to third aspects, the heating block and the cooling block can be integrally raised and lowered with respect to the preform in the combined state. The driving means is fixedly arranged at the rising stop position of the cooling block.

According to the fourth aspect of the invention, when the heating block and the cooling block can be moved up and down with respect to the preform, the driving means of the cooling block separates from the cooling block and stops raising the cooling block. By arranging it in a fixed position, the elevating part is made compact, and
The driving state of the cooling block can be secured.

According to a fifth aspect of the present invention, in any one of the first to fourth aspects, the temperature of the preforms can be simultaneously adjusted in a state where a plurality of the preforms are stopped, and the cooling block includes the preforms. It is characterized in that it is arranged so as to face the side wall located in the arrangement direction of.

According to the fifth aspect of the present invention, when molding a flat container having a different draw ratio in the circumferential direction, it is possible to form a container having a large draw ratio along the arrangement direction.
Therefore, it is possible to make the cavity surface of the blow cavity mold shallow and facilitate manufacturing, and moreover, it is possible to reliably discharge the air between the preform and the cavity surface to the outside to improve the molding.

According to a sixth aspect of the present invention, in the fifth aspect, the cooling block is disposed so as to face one side wall or both side walls of the preforms in the arrangement direction, and the one direction or the two sides via the interlocking mechanism. The feature is that they can be linked in the opposite direction.

According to the sixth aspect of the present invention, the interlocking mechanism for a plurality of preforms allows the cooling block to be brought into contact with or separated from one side wall or both side walls of the preform at the same time, and the driving means can be minimized. be able to.

According to a seventh aspect of the present invention, in a blow molding method in which a tubular preform with a bottom is subjected to temperature control treatment in a temperature control step, and then blow molded, in the temperature control step, the temperature around the preform is increased. The preform is inserted into a heating block and a cooling block surrounding the preform, and the preform is heated by the radiant heat from the heating block. Part is locally cooled, and after the lapse of the predetermined time, the cooling block is retracted away from the preform side wall, and the preform is heated and cooled by relative movement between the preform and the heating block and cooling block. It is characterized in that the preform is transferred to a blow molding step after being taken out from the block.

According to the invention of claim 7, the temperature of the preform is controlled by the radiant heat from the heating block, and at the same time, the side wall of the preform can be locally cooled by the contact of the cooling block. Therefore, the temperature control time is sufficiently long. It is possible to perform cooling in the state where the preform is secured, and despite the fact that the preform is being cooled, the temperature control time of the preform is not limited, and it is possible to provide a time advantage.

In particular, when cooling the preform after the temperature control, the preform is taken out from the temperature control pot after the temperature control is finished, and then the preform is cooled. When the insert piece such as is mounted on the preform, it is necessary to further retract the cooling block from that state, and then the insert piece is mounted, so that the heating time is considerably restricted, By thus performing heating and cooling at the same time, it is possible to secure a sufficient heating time even when the insert piece is mounted in the temperature control step.

[0038]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the drawings.

FIGS. 1 to 7 are views showing a state in which a temperature control device for a preform according to an embodiment of the present invention is used in a temperature control part of a blow molding device.

In this blow molding apparatus, as shown in FIGS. 2 and 3, the rotary conveying plate 12 is intermittently rotatable in a horizontal state above the molding machine base 10 and is stopped at a predetermined position. An injection molding section, a temperature control section, a blow molding section, and an ejection section are provided at the respective stop positions of the rotary transport plate 12.

As shown in FIG. 1, a neck type supporting plate 14 composed of a dividing plate is attached to the lower surface of each stop position of the rotary conveying plate 12, and the neck type supporting plate 14 is composed of a split mold. A plurality of neck molds 16 are attached at a predetermined interval, and a bottomed cylindrical preform 20 having a neck portion 18 is injection-molded by using this neck mold 16, Preform 2 with neck mold 16
While holding the neck portion 0 of 0, the preform 20 is conveyed from the injection molding section to the temperature control section and the blow molding section, and further the product (container) blow molded by the blow molding section is conveyed to the ejection section. The product (container) is taken out and molded for one cycle.

Further, in this blow molding apparatus, the engaging portion of the handle is integrally engaged with the side wall of the container at the time of blow molding. Therefore, in the temperature adjusting section, as shown in FIG. Is attached to the preform 20.

In the temperature control unit, the temperature of the preform 20 is adjusted to a temperature suitable for blow molding, and a part of the side wall 24 of the preform 20 with which the handle 22 is engaged is locally cooled, which is a temperature control device. The heating / cooling pots 26 are arranged so as to correspond to the conveyance pitch of the plurality of preforms 20.

The plurality of heating / cooling pots 26 are mounted on a pot fixing base 28 which is supported so as to be movable up and down.
A pot fixing plate 30 is attached to the upper end of the heating / cooling pot 26.

The pot fixing plate 30 connects and fixes two heating / cooling pots 26, and the heating / cooling pots 26 are connected to each other.
Centering rings 32 are provided at the corresponding positions,
The pot fixing base 28 moves up to the neck mold 16 and the neck portion 1
The preform 20 supporting 8 is the heating / cooling pot 2
Neck mold 16 and centering ring 3 when inserted into 6
2 and the heating / cooling pot 26 and the preform 2 are engaged with each other.
Centering with 0 is performed.

The heating / cooling pot 26 is composed of four heating blocks 34a, 34b, 34c, 3 including an upper portion and a lower portion.
4d and one cooling block 36.

Three support rods 3 are provided between the upper heating block 34a and the lower uppermost heating block 34b.
8 is attached to maintain the distance between the upper heating block 34a and the lower uppermost heating block 34b.

Further, the heating blocks 34a, 34b, 34
c and 34d are ring-shaped, and the inner wall surface of the preform 20 is spaced from and faces the outer surface of the preform 20,
A band heater 40 as a heating means is attached to each outer peripheral surface, and the heating is performed by the band heater 40, so that each heating block 34a, 34b, 34
The preform 20 is heated by the radiant heat from the c and 34d.

Each heating block 34a, 34b, 34c,
Each of the band heaters 40 attached to 34d is temperature-controlled to a desired temperature, and a temperature distribution can be given to the preform 20 stepwise in the axial direction.

Further, the upper heating block 34a is located below the neck portion 18 of the preform 20, and its inner wall surface is brought closer to the outer surface of the preform 20 to improve heat transfer efficiency, and stretch blow molding is performed. At this time, the lower portion of the neck portion 18 of the preform 20, which is generally difficult to stretch, can be sufficiently heated.

A heat insulating material 42a is provided between the pot fixing plate 30 and the upper heating block 34a so that the heat of the heating block 34a is transferred from the pot fixing plate 30 to the neck mold 1.
6 and the heat insulating material 4 is provided between the lowermost heating block 34d and the pot fixing base 28.
2b is provided to prevent the heat of the heating block 34d from being transferred to the pot fixing base 28. Although not shown, a heat insulating material is not provided between the cooling block 36 and the heating blocks 34a and 34b.
A heat insulating material 42c is arranged between 34c and 34d so that mutual heat does not affect each other.

The cooling block 36 faces the side wall 24 of one of the preforms 20 (right side in FIGS. 1, 2, and 4) located in the arrangement direction of the preforms 20, and the upper heating block 34a and the lowermost block 34a. Upper heating block 3
It is supported by a support plate 44 between 4b and 4b, and can be moved back and forth with respect to the side wall 24 of the preform 20.

A cooling water passage 46 is provided in the cooling block 36 as a cooling means, and cooling water is supplied to the cooling water passage 46 for cooling.

Support plate 4 for each heating / cooling pot 26
4 is an interlocking mechanism 48 and a drive mechanism 50 as a drive means.
Thus, at the same time, the cooling block 36 is brought into contact with and separated from the side wall 24 of the preform 20.

The interlocking mechanism 48 includes a pair of linear shafts 54 on a plurality of support plates 52 erected on the pot fixing base 28 at a position between the two heating / cooling pots 26 connected and fixed by the pot fixing plate 30. By supporting the supporting plate 44 of each heating / cooling pot 26 by connecting the supporting plate 44 to the linear shaft 54 so as to be slidable in the horizontal direction, the cooling blocks 36 can be simultaneously slidably moved via the supporting plate 44.

As shown in FIG. 6, the support plate 52 is formed in a U-shape so as to minimize the influence of heat from the heating block, whereby the linear shaft 54 of the linear shaft 54 due to thermal expansion. It is designed not to affect slides.

2 and 4, a return mechanism 56 is mounted on the right end side support plate 44 around a linear shaft 54 between the support plate 52 adjacent to the support plate 44, and a pair of return mechanisms 56 are provided. The linear shaft 54 is biased to the right in the drawing, and biases the cooling block 36 in a direction away from the preform 20 via the support plate 44.

The return mechanism 56 includes a linear shaft 54
A stopper 58 provided around the periphery of the cooling plate 36 for restricting the movement of the support plate 44 in a state where the cooling block 36 is in contact with the preform 20, and the stopper 58 and the support plate 4
4 and a spring 60 that exerts a force in the direction in which the support plate 44 and the stopper 58 move away from each other. The support plate 44 is constantly cooled by the urging force of the spring 60 to the right in the drawing. 36 urges the preform 20 away from the preform 20, moves the support plate 44 in the direction in which the cooling block 36 contacts the preform 20 against the urging force of the spring 60 by the driving force of the driving mechanism 50, and stops the stopper 58. It is designed to stop at the contact position. Further, urethane washers 62 are attached to the linear shaft 54 at both sides of the support plate 52, and serve as a cushion when the linear shaft 54 moves.

The drive mechanism 50 is provided separately from the heating / cooling pot 26 and the interlocking mechanism 48 at the ascending / descending position of the cooling block 36 on the molding machine base 10. The drive mechanism 50 is in a fixed state without being raised / lowered. By doing so, the number of members moving up and down on the pot fixing base 28 side is reduced, and the lifting and lowering is facilitated.

As shown in FIGS. 2 to 5, the drive mechanism 50 is provided on a cylinder mounting table 64 fixed on the molding machine table 10. The cylinder mounting table 6 is mounted on the cylinder mounting table 64.
4 has a vertical member 66 facing the support plate 44, and the vertical member 66 is located at the right side position in FIGS.
A book guide rod 68 is arranged horizontally. A cylinder fixing plate 70 is slidably attached to the guide rod 68 in a vertical state, and a drive cylinder 72 is attached to the cylinder fixing plate 70. This drive cylinder 72
The piston rod 74 of the penetrating cylinder fixing plate 70 is connected and fixed to the vertical member 66, and the cylinder fixing plate 70 is driven by the driving cylinder 72 along the guide rod 68 in the left-right direction in FIGS. It is designed to move.

Further, a push rod 76 is horizontally attached and fixed to the cylinder fixing plate 70 in a state of penetrating the vertical member 66, and the push rod 76 is slidably moved as the cylinder fixing plate 70 slides. Is pressed to bring the cooling block 36 supported by each support plate 44 through the interlocking mechanism 48 into contact with the preform 20,
When the pressing is released, the cooling block 36 is separated from the preform 20 by the return mechanism 56.

Further, the support plate 44 and the cooling block 3
As shown in FIG. 7, 6 and 6 are connected via cushion means 78.

The cushion means 78 includes the support plate 44.
A pair of stopper rods 80 penetrating through the cooling block 36 and fixed to the cooling block 36, and a spring 82 as an elastic member attached around the stopper rod 80 and biasing the cooling block 36 in a direction away from the support plate 44. Therefore, a small gap 84 is always formed between the support plate 44 and the cooling block 36, and the gap 84 allows the plural cooling blocks 36 with respect to the plural preforms 20.
Of the outer surface of the preform 20 due to contraction of the preform 20 during temperature control, errors in the contacting positions of the preform 20 when the two are simultaneously contacted, and the cooling block 36 can be absorbed. The state in which the reform 20 can be surely contacted is ensured.
The gap 84 is set to about 1 mm.

Next, a blow molding method using the above-mentioned temperature control device for preform will be described.

First, the preform 20 is the neck mold 16
While the neck portion 18 is held in the upper part, the rotary transfer plate 12 is intermittently transferred from the injection molding part to the temperature control part.

In this case, in the temperature adjusting section, as shown in the lower half of FIG. 4, in the drive mechanism 50, the push rod 76 is retracted by the drive cylinder 72, and the pot fixing base 28 is the molding machine base. The heating / cooling pot 26 is retracted from the conveyance path of the preform 20 by descending to the 10 side. Further, the cooling block 36 of each heating / cooling pot 26 is urged by the return mechanism 56 of the interlocking mechanism 48 in the direction away from the preform 20.

When the pot fixing base 28 is raised from this state, the heating / cooling pot 26 fixed on the pot fixing base 28 is raised at a position corresponding to the preform 20,
The preform 20 is inserted into the heating / cooling pot 26, and the preform 20 is completely inserted into the heating / cooling pot 2.
6 is inserted into the centering ring 3
2 to engage the heating / cooling pot 26 and the preform 20.
Centering is performed and the state shown in FIG. 2 is obtained.

In this case, when the preform 20 is inserted into the heating / cooling pot 26, the cooling block 36 is urged in the direction away from the preform 20.
It does not damage the outer surface of the preform 20.

Then, with the preform 20 inserted in the heating / cooling pot 26, each heating block 34 is
a, 34b, 34c, 34d are heated to a desired temperature by respective band heaters 40, and each heating block 34a,
The preform 20 is heated for a predetermined time by radiant heat from 34b, 34c and 34d. Then, in the middle of this temperature control process, as shown in the upper half of FIG. 4, the driving mechanism 50 moves the cooling blocks 36 of the heating / cooling pots 26 to the preform 20 side and makes them contact for a predetermined time, and The engagement region of the handle 22 which is a part of the side wall is locally cooled.

Even during this cooling, the heating block 34
Since heating by a, 34b, 34c, and 34d is continued, a sufficient heating time can be secured.

To drive the cooling block 36, the piston rod 74 is moved to the right in the figure by the drive cylinder 72, and the reaction force causes the cylinder fixing plate 70 to move to the left along the guide rod 68. The push rod 76 fixed to the cylinder fixing plate 72 projects leftward in the drawing from the vertical member 66 and abuts on the support plate 44 at the right end, and the support plate 44 is moved to the return mechanism 5
6 is moved to the left in the figure against the biasing force of the spring 60. When the support plate 44 moves, the linear shaft 54 connected to the support plate 44 moves leftward in the figure, and the plurality of support plates 44 move to the cooling block 3.
6 at the same time in the direction of contact with the preform 20,
Local cooling is performed by contacting a part of the side wall of the preform 20.

Next, the cooling block 36 is brought into contact with part of the side wall 24 of the preform 20 for a predetermined time to perform local cooling, and then the push rod 76 is driven by the drive cylinder 72.
Is moved to the vertical member 66 side, the cylinder fixing plate 70
Is slid to the right in the figure, the push rod 76 moves to the right in the figure, and the pressing force on the support plate 44 is released.

When the pressing force of the push rod 76 is released, the support plate 44 moves to the right in the figure by the urging force of the spring 60 of the return mechanism 56, and the linear shaft 54 moves as the support plate 44 moves. A plurality of support plates 44 are connected to the cooling block 36 at the same time.
Will be retracted away from the side wall 24 of the preform 20.

In this state, the heating blocks 34a, 34
Preform 2 by radiant heat from b, 34c, 34d
The heating of 0 and the local cooling by the contact of the cooling block 36 are completed.

Next, the pot fixing base 28 is attached to the molding machine base 10.
Side, and the heating / cooling pot 26 fixed on the pot fixing base 28 is lowered to move the heating / cooling pot 26
The preform 20 is taken out from the inside, and the heating / cooling pot 26 is retracted from the transport path of the preform 20.

Next, with the heating / cooling pot 26 retracted from the conveying path of the preform 20, as shown in FIG. 3, the handle 22 having the ring portion 86 at one end and the engaging portion 88 at the other end is attached to the preform 20. Is inserted from below, and the ring portion 86 is engaged and fixed to the step portion 90 below the neck portion 18. The grip 22 is attached by an inserter, and after the grip 22 is attached, the inserter is retracted from the conveyance path of the preform 20.

Then, the rotary conveying plate 12 is intermittently rotated to convey the preform 20 to which the handle 22 is attached to the blow molding section, and blow air is introduced into the preform 20 to mold it into a container shape.

In this case, the resin wraps around and engages with the engaging portion 88 of the handle 22 during blow molding.
The region of the side wall 24 of the preform 20 that is engaged with the engaging portion 88 is locally cooled, has a sufficient wall thickness, and has a large amount of heat that is retained, so that the region does not burst from the engaging region. Engagement will be made.

Further, the container formed in the blow molding process is conveyed to the take-out section by intermittent rotation of the rotary conveying plate 12 and the container is taken out to complete one cycle of forming.

8 to 10 are views showing another embodiment of the present invention.

In this embodiment, as shown in FIG.
When molding a flat container 100 having a different draw ratio in the circumferential direction, the wall thickness in the direction X having a high draw ratio becomes extremely thin and may be whitened in some cases. The thickness is ensured so that the container can be molded without whitening.

Therefore, in the temperature control section, as shown in FIG. 8, a pair of cooling blocks 106 are provided at positions corresponding to the side walls 104, 104 of the preform 20 located in the direction in which the stretching ratio of the heating / cooling pot 102 is high. , 106 are arranged, and heating blocks 110, 110 are arranged at positions corresponding to the other side walls 108, 108.

The cooling blocks 106, 106 and the heating blocks 110, 110 are, as shown in FIG.
The heating blocks 114 and 116 are provided substantially over the height of the preform 20 and are provided below the neck portion 18 and at the bottom portion 112.

The cooling blocks 106 and 106 are support plates 44 and 4 which are driven by a drive mechanism (not shown).
4 supports the side walls 104, 104 of the preform 20 so as to be able to contact and separate from each other. Although not shown, the support plates 44, 44 allow the cooling blocks 106, 106 to simultaneously contact and separate from the preform 20 by an interlocking mechanism. As the interlocking mechanism, for example, a pinion is provided between racks provided on not-shown linear shafts to interlock the support plates 44, 44 in opposite directions, or the support plates 44, 44 are supported on separate linear shafts. In this way, the support plates 44, 44 can be interlocked with each other in the opposite direction by the individual drive cylinders. The cushion means 7 is provided between the support plates 44, 44 and the cooling blocks 106, 106.
8 and 78 are provided, which is similar to the above-described embodiment.

A temperature control core mold 118 is provided inside the preform 20, and the temperature control core mold 118 is provided.
Is brought into contact with the inner surface of the preform 20 at the position corresponding to the contact of the cooling blocks 106, 106, and the cooling blocks 106, 1
The pressing force of 06 prevents the preform 20 from being distorted.

Heating blocks 110, 110, 114, 1
Reference numeral 16 has an inner wall surface that faces the outer surface of the preform 20 with a space therebetween.
It is designed to be heated. The heating block 1
10 uses a cartridge heater 120 as a heating means, and the heating blocks 114 and 116 use a band heater 40 as a heating means. Further, a heat insulating material 122 is attached to the heating blocks 110, 110 at positions corresponding to the cooling blocks 106, 106.

Then, such a heating block 110,
The preform 20 is heated by the radiant heat from 110, 114, 116, and the cooling block 106,
After 106 is contacted with the both side walls 104 of the preform 20 over substantially the entire length for a predetermined time to locally cool the preform 20, a blow cavity mold 124 shown in FIG.
Both side walls 104, 1 of the locally cooled preform 20
By performing blow molding with the 04 portion positioned in the direction X having a high stretch ratio, the thickness of the portion having a high stretch ratio can be secured and a container of good quality can be obtained without whitening.

By arranging the cooling blocks 106 and 106 so as to face the side walls of the plurality of preforms 20 arranged in the arrangement direction, a blow cavity can be formed when a flat container as shown in FIG. 9 is formed. By making the cavity of the mold 124 shallow, manufacturing can be facilitated, and air between the cavity surface and the preform 20 can be surely discharged to improve moldability.

The present invention is not limited to the above-mentioned embodiments, but can be modified into various embodiments within the scope of the gist of the present invention.

For example, in the above-mentioned embodiment, the case where the preform is conveyed while the neck portion is held by the neck die attached to the rotary conveying plate has been described, but the present invention is not limited to this example, and the preform is not rotated. It may be carried out linearly, or may be carried out without holding the neck portion, and the point is that it can be applied to any blow molding apparatus having a temperature control section.

Further, the arrangement position of the cooling block is not limited to the arrangement direction of the plurality of preforms, but may be set in a direction intersecting with the arrangement direction. In such a case, the portion having a small draw ratio is the preform. Since it is located in the arrangement direction of, the number of simultaneous moldings can be easily increased.

Further, in the above-mentioned embodiment, the heating / cooling pot is moved up and down to insert and remove the preform. However, the preform may be moved up and down. It suffices to insert and remove by.

[0093]

[Brief description of drawings]

FIG. 1 is a partially enlarged cross-sectional view showing a temperature control device for a preform according to an embodiment of the present invention.

FIG. 2 is a partial front view showing a state in which a plurality of preforms are simultaneously heated and cooled using the preform temperature control device shown in FIG.

FIG. 3 is a partial front view showing a state in which the temperature controller of the preform is lowered from the state of FIG. 2 and the handle is attached to the preform.

FIG. 4 is a cross-sectional view in a plan view as seen from the position of line IV-IV in FIG. 2, in which the upper half of the broken line shows the contact state with the cooling block preform, and the lower half shows the non-contact state. Is.

5 is a side view as seen from the direction of the arrow V in FIG.

6 is a perspective view showing a linear shaft support plate that constitutes the interlocking mechanism shown in FIGS. 2 and 4. FIG.

FIG. 7 is an enlarged plan view showing a contacting / separating state of a cooling block with respect to a preform, wherein (1) is a contact state and (2) is a separated state.

FIG. 8 is a plan view showing a temperature control device for a preform according to another embodiment of the present invention.

FIG. 9 is a diagram showing a case where heating is performed using the temperature control device for the preform in FIG.
It is a concave cross-sectional view showing a state in which a cooled preform is blow-molded in a blow cavity mold.

10 is a vertical cross-sectional view of the preform temperature adjusting device taken along line XX of FIG.

[Explanation of symbols]

20 preform 24, 104 side wall 26, 102 heating / cooling pot 34a, 34b, 34c, 34d, 110, 114, 1
16 Heating Block 36, 106 Cooling Block 48 Interlocking Mechanism 50 Drive Mechanism 72 Drive Cylinder 76 Push Rod 78 Cushion Means 84 Gap 100 Container 118 Temperature Control Core Type 124 Blow Cavity Type

Claims (7)

[Claims] 1. A temperature control device for a preform, which is disposed in a temperature control part for performing a temperature control process on a preform before blow molding a bottomed tubular preform, comprising: A heating block having an inner wall surface facing away from the surface and being heated by heating means to heat the preform by radiant heat; and a side wall of the preform which is combined with the heating block and cooled by cooling means. A cooling block for locally cooling a part of the preform, wherein the cooling block is arranged so as to be movable back and forth with respect to the preform, and can be brought into contact with and separated from a side wall of the preform by a driving means. Preform temperature control device characterized by 2. The temperature of a preform according to claim 1, wherein the heating block is arranged in an upper part and a lower part, and the cooling block is arranged between an upper part and a lower part of the heating block. Adjustment device. 3. The cooling block according to claim 1, wherein the cooling block is urged toward the preform by an elastic member so that the cooling block is brought into contact with the preform during contact driving of the cooling block with respect to the preform. A temperature control device for a preform, characterized by having cushioning means for securing the temperature. 4. The heating block and the cooling block according to claim 1, wherein the heating block and the cooling block can be raised and lowered integrally with the preform in the combined state, and the driving means of the cooling block is the cooling unit. A temperature control device for a preform, wherein the temperature control device is fixedly arranged at a rising stop position of a block. 5. The preform according to claim 1, wherein the plurality of preforms can be temperature-controlled simultaneously in a state where a plurality of preforms are stopped, and the cooling block is located in a direction in which the preforms are arranged. A temperature control device for a preform, which is arranged so as to face a side wall. 6. The cooling block according to claim 5, wherein the cooling block is disposed so as to face one side wall or both side walls of the preforms in the arrangement direction, and can be interlocked in one direction or the opposite direction via an interlocking mechanism. Preform temperature control device characterized by being 7. A blow molding method in which a bottomed tubular preform is subjected to temperature control in a temperature control step and then blow molded, wherein the temperature control step includes a heating block surrounding the preform and cooling. Insert the preform in the block, and heat the preform by radiant heat from the heating block,
The cooling block is contacted with the side wall of the preform for a predetermined time to locally cool a part of the side wall of the preform, and after the predetermined time passes, the cooling block is retracted away from the side wall of the preform, A blow molding method, wherein the preform is taken out of the heating block and the cooling block by relative movement of the reform and the heating block and the cooling block, and then the preform is transferred to a blow molding step.