JP5967712B2 - Die head structure of blow molding equipment - Google Patents

Description

  The present invention relates to a die head structure for extruding a multi-layer parison of a blow molding apparatus for molding a fuel tank.

Conventionally, blow molding methods have been widely used for molding synthetic resin tanks such as automobile fuel tanks because of the ease of molding a hollow body.
In this blow molding, a multi-layer parison is used because the fuel tank requires gas permeation resistance and fuel oil resistance. As shown in FIG. 11, a die head 110 for extruding a multilayer parison uses a multilayer ring 112 having a multilayer annular nozzle 111 (see, for example, Patent Document 1).

In this case, as shown in FIG. 12, a die head 110 having a large number of concentric material flow paths 120 is used to extrude the multilayer parison 101, and each material flow path 120 has an extruder 140. Is installed.
For example, as shown in FIG. 13, each of the extruders 140 includes, in order from the inner layer side of the multilayer parison 101 composed of six layers, an inner body layer extruder 141, an inner adhesive layer extruder 142, and a barrier layer extruder. 143, outer adhesive layer extruder 144, outer main body layer extruder 145, and skin layer extruder 146 are used.
For this reason, the whole molding apparatus becomes large and a huge space is required.

In addition, since the die head 110 itself needs to form the material flow paths 120 by the number of layers of the multi-layer parison 101 concentrically, the diameter increases in the radial direction, and the material flow path 120 extends from above the die head 110 to the nozzle 160. The flow path is long.
For this reason, the volume of the die head 110 increases, and it takes time to heat or cool the die head 110, resulting in an increase in energy loss.

Furthermore, since the material flow path 120 becomes long, there are many materials that make up the multi-layer parison 101 in the material flow path 120. When the extrusion of the multi-layer parison 101 is stopped, the material may cause thermal degradation. is there.
Further, as shown in FIG. 14, when the die head 110 is heated, a heater 170 is attached to the side surface of the die head 110. At this time, the heat of the heater 170 is transmitted as shown by the arrows in FIG. 14, but since the synthetic resin having low thermal conductivity exists in the material flow path 120, it takes time to heat and cool the die head 110. Become.

JP-A-9-99475

  This invention is made | formed in view of such a situation, and makes it a subject to provide the die head structure of the blow molding machine which has little deterioration of the synthetic resin which comprises a parison, and can also reduce equipment.

The present invention of claim 1 for solving the above-mentioned problem is a die head structure for extruding a multi-layer parison of a blow molding apparatus for molding a fuel tank.
As for the die head, the die that extrudes the material of each layer of the multi-layered parison stacks the same number as the number of layers in the vertical direction, and the parison that the material of each layer flowing from each die flows into the center of the die head flows down , Forming a parison channel that communicates each die in the vertical direction,
Each die is injected with the respective material of each layer of the parison from each side to form a material flow path that extrudes the material of each layer of the parison into the parison flow path,
Form a cooling medium flow path inside the die head,
The multi-layer parison includes two adhesive layers, the die head has two adhesive layer dies forming two adhesive layers, and the two adhesive layer dies are one extrusion. An adhesive is supplied from a machine via a diverter, and the supply of the adhesive to two adhesive layer dies is controlled by the diverter .

According to the present invention of claim 1, the die head is a material in which the die for extruding the material of each layer of the multi-layer parison is laminated in the longitudinal direction in the same number as the number of layers, and the material of each layer flowing from each die into the center of the die head The parison united with each other flows down, and a parison flow path that connects the dies in the vertical direction is formed. For this reason, it is not necessary to form many concentric material flow paths in the die head, and the volume of the die head can be reduced, so that the die head can be quickly heated and cooled. Furthermore, the material flow path in the die head can be shortened, and material waste is reduced. Further, the fuel tank can be easily configured with a multilayer parison.
Furthermore, since the dies are only stacked in the vertical direction, the dies can be easily disassembled and cleaned.

  Each die was injected with the respective material of each layer of the parison from the respective side surface to form a material flow path for extruding the material of each layer of the parison into the parison flow path. For this reason, the material injected from the side surface of each die can be combined with the parison flow path forming the parison which is the center of the die head with a short flow path, and the die head can be miniaturized.

Since the cooling medium flow path is formed inside the die head, the die head can be quickly cooled. For this reason, the start and stop time of the blow molding machine can be shortened, and even if the extrusion of the parison is stopped in the middle, deterioration of the extruded material in the die head can be prevented, and the stop time of the extrusion If it does not become a long time, it can be used as it is without taking out the extruded material in the die head.
The multi-layer parison includes two adhesive layers, the die head has two adhesive layer dies forming two adhesive layers, and the two adhesive layer dies are one extrusion. The adhesive is supplied from the machine via the diverter, and the supply of the adhesive to the two adhesive layer dies is controlled by the diverter. For this reason, the extrusion molding machine which extrudes an adhesive agent can be made into one unit, and the whole blow molding apparatus can be reduced in size. The supply amount of the two adhesive layers can be controlled by a flow divider to balance the two adhesive layers.

  According to a second aspect of the present invention, there is provided a die head structure of a blow molding apparatus in which the flow path of the cooling medium is formed on each laminated surface of a die having a multilayer structure.

  In the second aspect of the present invention, since the flow path of the cooling medium is formed on each of the laminated surfaces of the dies having a multilayer structure, it can be directly cooled for each die constituting the die head, and the entire die head can be quickly Can be cooled. For this reason, even if the extrusion of the multilayer parison is stopped, the deterioration of the material remaining in each die can be prevented.

  The present invention of claim 3 is a die head structure of a blow molding apparatus in which irregularities for increasing the surface area are formed on the surface of each die constituting the flow path of the cooling medium.

  According to the third aspect of the present invention, since the unevenness for increasing the surface area is formed on the surface of each die constituting the flow path of the cooling medium, the cooling efficiency of each die is improved and the cooling time of the die head is shortened. can do.

  According to a fourth aspect of the present invention, there is provided a die head structure of a blow molding apparatus in which the flow path of the cooling medium is formed without the cooling medium inflow path and the discharge path being opposed to each other.

  In the present invention of claim 4, since the cooling medium flow path is formed without the cooling medium inflow path and the discharge path facing each other, the cooling medium causes turbulence in the cooling medium flow path, It spreads evenly in the flow path and can be quickly and uniformly cooled.

The present invention of claim 5 is a die head structure of a blow molding apparatus in which the supply amount of the adhesive is controlled by controlling the temperature and the diameter of the flow path.

In the present invention of claim 5 , since the supply amount of the adhesive is controlled by controlling the temperature and the diameter of the diversion channel, the structure of the diversion channel is simple, the apparatus can be miniaturized, and precise control is performed. can do.

According to a sixth aspect of the present invention, the die head is a die head structure of a blow molding apparatus in which a heater is attached to the side surface and / or the upper and lower surfaces.

In the present invention of claim 6 , since the die head is provided with heaters on the side surface and / or the upper and lower surfaces, the die head can be heated quickly and uniformly. Further, since the material flow path of each die is formed in the lateral direction, the heating of the side heater can be transmitted to the center without being hindered by the blow molding material.

According to a seventh aspect of the present invention, the die head is a die head structure of a blow molding device in which each stacked die is fastened with a nut via a connecting bolt and a disc spring.

In the present invention of claim 7 , since the die head is tightened with the nuts via the connecting bolts and the disc springs, each die can be firmly tightened, and each die is thermally expanded and contracted. Even so, the disc spring can maintain a strong tightening force.

Since the cooling medium flow path is formed inside the die head, the die head can be cooled quickly, so that deterioration of the extruded material in the die head can be prevented, and the extruded material in the die head is not taken out. Can be used.
In each die, the material of each layer of parison was injected from the side, and the material channel for extruding the material of each layer of parison into the parison channel was formed, so the material injected from the side formed a parison with a short channel The die head can be miniaturized.
The multi-layer parison includes two adhesive layers, the die head has two adhesive layer dies forming two adhesive layers, and the two adhesive layer dies are one extrusion. The adhesive is supplied from the machine via the diverter, and the supply of the adhesive to the two adhesive layer dies is controlled by the diverter. For this reason, the extrusion molding machine which extrudes an adhesive agent can be made into one unit, and the whole blow molding apparatus can be reduced in size. The supply amount of the two adhesive layers can be controlled by a flow divider to balance the two adhesive layers.

It is sectional drawing of the die head structure of the blow molding apparatus which is embodiment of this invention. It is sectional drawing of the extruder and diverter of the adhesive agent of the die head structure of the blow molding apparatus which are embodiment of this invention. It is a top view of the part of the extruder of the die head structure of the blow molding apparatus which is embodiment of this invention. It is sectional drawing of the material flow path and heater part of the die head structure of the blow molding apparatus which is embodiment of this invention. It is sectional drawing of the part of the connection bolt of the die head structure of the blow molding apparatus which is embodiment of this invention. It is sectional drawing of the part of the flow path of the cooling medium of the die head structure of the blow molding apparatus which is embodiment of this invention. It is a schematic diagram of the structure which sends a cooling medium to the die head structure of the blow molding apparatus which is embodiment of this invention. It is a top view of the cooling air flow path of the die | dye surface of the die head structure of the blow molding apparatus which is embodiment of this invention. It is the perspective view seen from diagonally upward of the fuel tank shape | molded with the blow molding apparatus which is embodiment of this invention. It is an expanded sectional view of the layer structure of the outer wall of the fuel tank shape | molded with the blow molding apparatus which is embodiment of this invention. It is sectional drawing of the die head structure of the conventional blow molding apparatus. It is an expanded sectional view of the material flow path of the die head structure of the conventional blow molding apparatus. It is a top view of the part of the extruder of the die head structure of the conventional blow molding apparatus. It is an expanded sectional view of the material flow path and heater part of the die head structure of the conventional blow molding apparatus.

  A die head structure of a blow molding apparatus for molding a fuel tank 1 according to an embodiment of the present invention will be described with reference to FIGS. The die head structure of the blow molding apparatus of the present invention can be widely used for molding fuel tanks other than automobiles formed by blow molding, even if it is not a fuel tank for automobiles.

As shown in FIG. 9, the fuel tank 1 blow-molded in the embodiment of the present invention has an outer wall formed of a synthetic resin having a multilayer structure. The fuel tank 1 is attached to the lower surface of the floor panel of the vehicle body, and irregularities are provided according to the shape of the lower surface. The fuel tank 1 is provided with a fuel pump (not shown) or the like on the fuel tank 1. A pump unit mounting hole 4 is formed on the upper surface for taking in and out. A fuel injection hole 5 for injecting fuel from an inlet pipe (not shown) is formed on the side surface or the upper surface of the fuel tank 1.
Furthermore, on the upper surface of the fuel tank 1, there are formed attachment holes 6 at various places for connecting a hose or the like for collecting the internal fuel vapor. For these reasons, the outer wall of the fuel tank 1 has an uneven shape.

In the present embodiment, the fuel tank 1 is formed by blow molding, and its outer wall has a multilayer structure of synthetic resin, and as shown in FIG. A layer 1c, a barrier layer 1d, an internal adhesive layer 1e, and an internal body layer 1f are formed.
In blow molding, a parison composed of the above six layers is used. A parison having a layer configuration other than six layers can also be used. As will be described later, the skin layer 1a is used when a reproducing member, a filler, or the like is mixed into the outer main body layer 1b, but the skin layer 1a can be omitted.

  The skin layer 1a and the outer main body layer 1b are formed from a thermoplastic synthetic resin that has high impact resistance and maintains rigidity against fuel oil, and is preferably formed from high-density polyethylene (HDPE). When the outer main body layer 1b contains an inorganic filler, the outer skin layer 1a is used to cover the surface of the outer main body layer 1b, and the surface can be smoothed without any inorganic filler appearing on the surface. .

As the high-density polyethylene (HDPE) used for the skin layer 1a, the outer main body layer 1b, and the inner main body layer 1f described later, for example, the following polyethylene can be specifically used.
High-density polyethylene (HDPE) having a melt flow rate (MRF: 21.6 kg / 10 min) of 5 to 7 and a density (g / cm ³ ) of 0.944 to 0.950 may be used. it can.

The outer main body layer 1b may be formed using a recycled material mainly containing high-density polyethylene (HDPE) as a main material. Recycled materials mainly containing high-density polyethylene (HDPE) are used, for example, when the fuel tank 1 collected after use is crushed and recycled and used during the manufacturing process of the fuel tank 1 In some cases, scraps and defective products generated in the above are crushed and recycled. Since the fuel tank 1 is mainly composed of high density polyethylene (HDPE), the recycled material obtained by pulverizing the fuel tank 1 mainly has high density polyethylene (HDPE).
There are cases where 100% of these recycled materials are used and cases where new high density polyethylene (HDPE) is mixed with the recycled materials.

The barrier layer 1d is formed of a thermoplastic synthetic resin that has very little permeation of fuel oil. Examples of the thermoplastic synthetic resin constituting the barrier layer 1d include ethylene vinyl alcohol copolymer (EVOH), polybutylene terephthalate, polyethylene terephthalate, polyphenylene sulfide (PPS), liquid crystal polymer (LCP), and semi-aromatic nylon (PPA). Can be used, but ethylene vinyl alcohol copolymer (EVOH) is preferred.
Since the barrier layer 1d is provided, fuel oil such as gasoline that has permeated through an inner main body layer 1f described later can be prevented from permeating through the barrier layer 1d, and the fuel oil can be prevented from evaporating in the atmosphere.

  When an ethylene vinyl alcohol copolymer (EVOH) is used as the barrier layer 1d, it has excellent gasoline permeation preventive properties, melt molding, and excellent workability. Moreover, it is excellent in gasoline permeation prevention even under high humidity. Furthermore, it can have excellent permeation resistance for gasoline containing alcohol.

  The outer adhesive layer 1c is provided between the outer main body layer 1b and the barrier layer 1d, and the two layers are bonded, and the inner adhesive layer 1e is provided between the inner main body layer 1f and the barrier layer 1d. Adhere these two layers. The external adhesive layer 1c and the internal adhesive layer 1e are formed of the same material, and are formed of a synthetic resin having adhesiveness to both the high density polyethylene (HDPE) and the barrier layer 1d. For this reason, the outer adhesive layer 1c and the inner adhesive layer 1e are firmly bonded to the barrier layer 1d, the outer main body layer 1b, and the inner main body layer 1f, respectively, and the respective layers are integrally adhered, It is possible to ensure the fuel permeation preventive property and strength of the fuel tank 1.

As the adhesive thermoplastic synthetic resin used for the external adhesive layer 1c and the internal adhesive layer 1e, for example, a modified polyolefin resin can be used, and an unsaturated carboxylic acid modified polyolefin resin, particularly an unsaturated carboxylic acid. A modified polyethylene resin is preferred. This can be produced by copolymerizing or graft-polymerizing an unsaturated carboxylic acid to a polyolefin resin.
As described in the skin layer 1a, the inner main body layer 1f uses high-density polyethylene (HDPE), which is the same material as that used by the skin layer 1a.

  In particular, the barrier layer 1d, the external adhesive layer 1c, and the internal adhesive layer 1e are easily affected by heat, and therefore, when the production stops, the resin flow is stopped while the resin remains in the die head 10. Since the resin deteriorates, it is necessary to cool the die head 10 in a short time.

Next, the die head structure of the blow molding apparatus will be described with reference to FIGS.
In the present embodiment, an example in which a parison 8 having a six-layer structure is extruded will be described as an example, but multilayer parisons other than six layers can be used.
As shown in FIG. 1, a die head 10 for extruding a six-layer parison 8 has six disk-like dies that extrude the material forming each of the six layers stacked in the vertical direction.

  That is, an internal body layer die 11 that extrudes the internal body layer 1f from above, an internal adhesive layer die 12 that extrudes the internal adhesive layer 1e, a barrier layer die 13 that extrudes the barrier layer 1d, and an external adhesive layer An external adhesive layer die 14 for extruding 1c, an external main body layer die 15 for extruding the external main body layer 1b, and a skin layer die 16 for extruding the skin layer 1a.

For this reason, it is not necessary to form concentric material flow paths in the die head 10 as in the prior art, and the volume of the die head 10 can be reduced. Therefore, the heat capacity of the die head 10 is small, and heating and cooling of the die head 10 can be performed quickly. It can be carried out. Furthermore, the material flow path in the die head 10 can be shortened, and deterioration of the material can be prevented.
In this die head structure, disk-shaped dies are stacked, so that disassembly and cleaning are easy.

  The internal body layer die 11 is formed by overlapping two disks, and an internal body layer material flow path 21 through which the material forming the internal body layer 1f flows is formed at the interface formed by the overlap. 11 to the parison material flow path 27 described later. A parison material flow path 27 through which the parison 8 flows in a cylindrical shape in the vertical direction is formed at the center of the inner main body layer die 11. The parison material flow path 27 is formed in the vertical direction by communicating the above six dies.

  An internal body layer extruder 41, which will be described later, is connected to the opening on the side surface of the internal body layer die 11, and a synthetic resin forming the internal body layer 1f is injected into the internal body layer material flow path 21. Although FIG. 1 shows a barrier layer extruder 43 for extruding a synthetic resin for forming the barrier layer 1d, an internal body layer extruder 41 is also connected in the same manner.

  And also about the internal adhesive layer die 12, the barrier layer die 13, the external adhesive layer die 14, the external main body layer die 15 and the skin layer die 16, respectively, as with the internal main body layer material flow path 21, respectively. An internal adhesive layer material flow path 22, a barrier layer material flow path 23, an external adhesive layer material flow path 24, an external body layer material flow path 25, and a skin layer material flow path 26 are formed. Further, similar to the inner body layer extruder 41, an adhesive layer extruder 42, a barrier layer extruder 43, an outer body layer extruder 45, and a skin layer extruder 46 are connected to the openings on the side surfaces of each die, respectively. The material forming each layer is injected. The adhesive layer extruder 42 will be described later.

  The material injected into each die flows into a parison material flow path 27 formed at the center of each die, and merges to form a six-layer parison. It flows down through the flow path 61 and reaches a blow molding die to form a blow molded product. For this reason, the material injected from the side surface can be combined with the parison material flow path 27 with a short flow path, and the die head 10 can be reduced in size.

  As shown in FIG. 2, the adhesive is supplied to the internal adhesive layer die 12 and the external adhesive layer die 14 from one adhesive layer extruder 42. That is, the adhesive supplied from the adhesive layer extruder 42 is diverted by the diverter 50, and the supply amount is controlled, and is supplied to the internal adhesive layer die 12 and the external adhesive layer die 14. For this reason, the adhesive layer extruder 42 which extrudes an adhesive agent can be made into one unit, and the whole blow molding apparatus can be reduced in size. The supply amount of the two adhesive layers can be controlled by the flow divider 50 to balance the external adhesive layer 1c and the internal adhesive layer 1e.

  Control of the adhesive supplied from the adhesive layer extruder 42 is performed by controlling the temperature and the diameter of the internal adhesive distribution channel 52 and the external adhesive distribution channel 53 that are branched from the inflow channel 51 of the flow dividing device 50. That is, a heater (not shown) is attached to each of the internal adhesive distribution channel 52 and the external adhesive distribution channel 53, and the heaters are individually controlled, and the flow divider 50 is slid to slide the internal adhesive distribution channel 52. And the external adhesive distribution channel 53 are controlled by changing the connection areas respectively connected to the internal adhesive layer material flow channel 22 and the external adhesive layer material flow channel 24 that are opened on the side surface of each die. For this reason, the structure of the flow divider 50 is simple, the apparatus can be miniaturized, and precise control can be performed.

  Since the adhesive layer extruder 42 for supplying the material to the internal adhesive layer die 12 and the external adhesive layer die 14 is made one, the number of extruders can be reduced to 5 in total, The space of the entire molding machine can be reduced. Moreover, as shown in FIG. 3, since the number of extruders is five, the five extruders can be moved to one side with respect to the die head 10, and the space of the entire blow molding machine can be further reduced. .

  As shown in FIG. 4, the die head 10 is heated by a heater 70 attached to the side surface of each die. The heater 70 can be attached to the upper surface of the die head 10 as shown in FIG. When the heater 70 is attached to the side surface of each die, the heat of the heater 70 is transferred from the side surface to the center in the lateral direction. Since the resin material flow path constituting the parison 8 is in the lateral direction, the die head 10 can be heated quickly and uniformly without impeding the heat conduction of the heater 70. For this reason, rapid temperature rise of the die head 10 is possible.

  As shown in FIG. 5, in the die head 10, the stacked dies are firmly fastened with connecting bolts 18 and nuts 18 a. A disc spring 19 is provided between the nut 18 a and the inner main body layer die 11. Since the disc spring 19 is provided, the disc spring 19 can be bent even if each die is thermally expanded or contracted, and a strong tightening force can be maintained. Tightening each die with the connecting bolt 18 and the nut 18a is performed uniformly at a plurality of locations on each die.

  Each die is cooled by a cooling medium flow path formed on the die-to-die stacking surface. A case where air is used as the cooling medium will be described as an example. As shown in FIG. 6, a cooling air flow path 30 to be described later is formed between the internal main body layer die 11 and the internal adhesive layer die 12 for cooling by circulating air. Since the cooling air flow path 30 is formed on the laminated surface between the inner body layer die 11 and the inner adhesive layer die 12, the inner body layer die 11 and the inner adhesive layer die 12 can be directly cooled, and the die head can be quickly moved. Can be cooled. The cooling air flow path 30 can be formed by forming half of the cooling air flow path 30 on the lower surface of the internal body layer die 11 and the upper surface of the internal adhesive layer die 12 and combining them.

  Further, between the internal adhesive layer die 12 and the barrier layer die 13, between the barrier layer die 13 and the external adhesive layer die 14, between the external adhesive layer die 14 and the external main body layer die 15, and external body. The cooling air flow path 30 is similarly formed between the layer die 15 and the skin layer die 16. For this reason, each die can be directly cooled, and the die head can be quickly cooled.

The cooling air passage 30 and the air flow will be described with reference to FIGS. FIG. 8 is a cooling air flow path 30 formed on the lower surface of the inner main body layer die 11. The cooling air flow path 30 is formed from an air inflow path 31, an air cooling path 32, and an air discharge path 33.
As shown in FIG. 7, the air is sent from the compressor 81 to the air tank 80, and sent from the air tank 80 to the air inflow path 31 formed on the side surface of each die by the air pipe 82.

  As shown in FIG. 8, on the lower surface of the inner main body layer die 11, the cooling air flow path 30 is formed with a plurality of air inflow paths 31 from the side surface toward the center direction, and in an arc shape along the air inflow path 31 A large number of air cooling paths 32 are formed. In the present embodiment, four air inflow passages 31 are radially formed 90 degrees apart, and four air exhaust passages 33 are provided between the air inflow passage 31 and the air inflow passage 31 from the side surface toward the center. The book is formed. The air inflow path 31 is formed up to the vicinity of the center portion of the inner main body layer die 11, and the air discharge path 33 is formed shorter than the air inflow path 31.

Since the arc-shaped irregularities are formed on the lower surface of the inner body layer die 11 and the air cooling path 32 is formed, the contact area between the lower surface of the inner body layer die 11 and the air increases, and the air and the inner body layer The cooling efficiency of the die 11 is improved, and the cooling time of the die head 10 can be shortened.
Further, the air inflow path 31 and the air discharge path 33 are formed without facing each other. For this reason, air causes a turbulent flow in the air cooling path 32, and the air cooling path 32 spreads uniformly over the entire air cooling path 32, thereby enabling quick and uniform cooling.
For this reason, even if the extrusion of the parison 8 is stopped halfway, the deterioration of the extruded material in the die head 10 can be prevented, and if the extrusion stop time does not become long, the extruded material in the die head 10 is removed. It can be used as it is without being taken out.

DESCRIPTION OF SYMBOLS 1 Fuel tank 8 Parison 10 Die head 20 Material passage 30 Cooling air flow path 40 Extruder 50 Divider

Claims (7)

In a die head structure for extruding a multi-layered parison of a blow molding device for molding a fuel tank,
In the die head, the die for extruding the material of each layer of the multi-layer parison is laminated in the longitudinal direction with the same number as the number of layers, and the parison in which the material of each layer flowing from each die is combined in the center of the die head. While flowing down, forming a parison channel that communicates each die in the vertical direction,
Each die is injected with the respective material of each layer of the parison from each side surface to form a material flow path for extruding the material of each layer of the parison into the parison flow path,
Forming a cooling medium flow path inside the die head;
The multi-layered parison includes two adhesive layers, and the die head has two adhesive layer dies that form the two adhesive layers, and the two adhesive layer dies are 1 An adhesive is supplied from a stand extruder through a flow divider, and the supply of the adhesive to the two adhesive layer dies is controlled by the flow divider . Die head structure.   2. The die head structure of a blow molding apparatus according to claim 1, wherein the flow path of the cooling medium is formed on each laminated surface of the dies having a multilayer structure.   The die head structure of a blow molding apparatus according to claim 2, wherein irregularities for increasing the surface area are formed on the surface of each die constituting the flow path of the cooling medium.   The die head structure of the blow molding apparatus according to claim 2, wherein the flow path of the cooling medium is formed without an inflow path and a discharge path of the cooling medium facing each other. 2. The die head structure of a blow molding apparatus according to claim 1 , wherein the supply amount of the adhesive is controlled by controlling the temperature and the diameter of the flow path. The die head structure of the blow molding apparatus according to any one of claims 1 to 5 , wherein the die head has heaters attached to side surfaces and / or upper and lower surfaces. The die head structure of the blow molding apparatus according to any one of claims 1 to 6 , wherein the die head is formed by tightening each stacked die with a nut through a connecting bolt and a disc spring.

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