KR101690030B1 - System for cooling fuel tank - Google Patents

System for cooling fuel tank Download PDF

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Publication number
KR101690030B1
KR101690030B1 KR1020150184606A KR20150184606A KR101690030B1 KR 101690030 B1 KR101690030 B1 KR 101690030B1 KR 1020150184606 A KR1020150184606 A KR 1020150184606A KR 20150184606 A KR20150184606 A KR 20150184606A KR 101690030 B1 KR101690030 B1 KR 101690030B1
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KR
South Korea
Prior art keywords
fuel tank
temperature
injection nozzle
refrigerant
flow rate
Prior art date
Application number
KR1020150184606A
Other languages
Korean (ko)
Inventor
최춘익
양종모
Original Assignee
(주)동희산업
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Priority to KR1020150184606A priority Critical patent/KR101690030B1/en
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Publication of KR101690030B1 publication Critical patent/KR101690030B1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K15/00—Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
    • B60K15/03—Fuel tanks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K15/00—Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
    • B60K15/03—Fuel tanks
    • B60K15/03177—Fuel tanks made of non-metallic material, e.g. plastics, or of a combination of non-metallic and metallic material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K15/00—Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
    • B60K15/03—Fuel tanks
    • B60K15/04—Tank inlets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K15/00—Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
    • B60K15/03—Fuel tanks
    • B60K2015/03243—Fuel tanks characterised by special pumps, the mounting thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K15/00—Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
    • B60K15/03—Fuel tanks
    • B60K2015/03256—Fuel tanks characterised by special valves, the mounting thereof
    • B60K2015/03296—Pressure regulating valves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K15/00—Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
    • B60K15/03—Fuel tanks
    • B60K2015/03328—Arrangements or special measures related to fuel tanks or fuel handling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K15/00—Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
    • B60K15/03—Fuel tanks
    • B60K2015/03328—Arrangements or special measures related to fuel tanks or fuel handling
    • B60K2015/03414—Arrangements or special measures related to fuel tanks or fuel handling associated with the fuel tank for cooling heated fuel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K15/00—Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
    • B60K15/03—Fuel tanks
    • B60K15/04—Tank inlets
    • B60K15/0406—Filler caps for fuel tanks
    • B60K2015/0419—Self-sealing closure caps, e.g. that don't have to be removed manually
    • B60K2015/0429—Self-sealing closure caps, e.g. that don't have to be removed manually actuated by the nozzle

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)

Abstract

The present invention provides a cooling system for a fuel tank, which is to control even cooling of a fuel tank after the fuel tank of a vehicle is formed. The cooling system for a fuel tank includes: a work die, wherein the fuel tank with an inlet and an outlet is loaded; multiple temperature measuring devices measuring the temperature of a divided part of the fuel tank by being installed on the work die; a refrigerant injection device injecting a refrigerant into the fuel tank by being connected to the inlet of the fuel tank and having multiple injection nozzles, wherein the each of the injection nozzles face the divided part of the fuel tank corresponding and the refrigerant injection device includes a control valve controlling a pressure or a flow rate of the refrigerant by each injection nozzle; and a controller receiving a temperature of every divided part of the fuel tank from the temperature measuring device and controlling the flow rate or the pressure of the refrigerant by each injection nozzle using a control valve. The controller controls the control valve. Therefore, the higher the temperature of the divided part of the fuel tank, the higher the flow rate or the pressure of the injection nozzle corresponding.

Description

[0001] SYSTEM FOR COOLING FUEL TANK [0002]

The present invention relates to a fuel tank cooling system for controlling the cooling of a fuel tank of a vehicle so as to be evenly cooled.

The fuel tank of the vehicle can be molded into a skill or plastic. Most of plastic fuel tanks use blow molding method. One sealed fuel tank system is manufactured by joining semi-solidified semi-finished products by mutual heat welding.

In the case of such a fuel tank, if the product can not be uniformly cooled in the cooling process after the product is molded, the product tends to be differently cured and the shape of the product may be distorted or the surface may be inconsistent.

Conventionally, there has been a problem that it is difficult to secure the quality of a product by injecting the coolant into the tank after the formation of the fuel tank at a time, thereby cooling and shaping the fuel tank in different parts.

Therefore, it was necessary to establish a cooling process optimized for each part of the fuel tank while cooling the fuel tank, and to perform cooling differently for each part.

It should be understood that the foregoing description of the background art is merely for the purpose of promoting an understanding of the background of the present invention and is not to be construed as an admission that the prior art is known to those skilled in the art.

KR 10-2005-0093770 A

SUMMARY OF THE INVENTION The present invention has been proposed in order to solve such a problem, and it is an object of the present invention to provide a fuel tank cooling system for controlling the cooling of the fuel tank of a vehicle so as to be uniformly cooled.

According to an aspect of the present invention, there is provided a fuel tank cooling system including: a work die to which a fuel tank having an inlet and an outlet is loaded; A plurality of temperature measuring devices provided on the work die and measuring the temperature of the divided portions of the fuel tank; A plurality of injection nozzles are provided, each of the injection nozzles is provided to face a divided portion of a corresponding fuel tank, and the flow rate of the coolant or the flow rate of the coolant for each injection nozzle A refrigerant injector provided with a control valve for controlling pressure; And a controller for controlling the flow rate or pressure of the refrigerant for each injection nozzle via the control valve, wherein the higher the temperature of the divided portion of the fuel tank is, the higher the flow rate of the corresponding injection nozzle Or a controller for controlling the control valve to increase the pressure.

The temperature gauge may be provided on the surface of the divided portion of the fuel tank to measure the surface temperature of the divided portion of each fuel tank.

In the refrigerant injector, a plurality of injection nozzles are embedded in one injection pipe, and the injection pipe can be inserted into the injection port of the fuel tank.

The outlet of the fuel tank may be a fuel pump coupling portion.

A blower for discharging the refrigerant may be provided outside the fuel tank outlet side.

And a plurality of distance measuring devices provided on the work die and measuring distances to the surfaces of the divided portions of the fuel tank.

The controller receives the temperature and the distance from each of the divided portions of the fuel tank from the temperature meter and the distance meter and controls the flow rate or pressure of the refrigerant for each injection nozzle through the control valve so that the higher the temperature of the divided portion of the fuel tank Or the control valve can be controlled such that the smaller the distance variation is, the higher the flow rate or pressure of the corresponding injection nozzle.

The controller can provide a control table regarding the temperature, the distance variation, and the injection nozzle control value in the form of a data map, and calculate the injection nozzle control value by substituting the measured temperature and the distance variation.

The distance variation may be a difference value that is changed from the distance measured by the distance measuring device.

According to the fuel tank cooling system of the present invention, the fuel tank of the vehicle can be controlled to cool evenly in cooling after forming the fuel tank.

Particularly, it is possible to secure the quality of the product in a lump by applying the cooling process to the product to be produced after establishing the cooling process for the specific product using the controller.

1 is a structural view of a fuel tank cooling system according to an embodiment of the present invention;
2 is a perspective view of a fuel tank cooling system according to an embodiment of the present invention;
3 is a schematic diagram of a fuel tank cooling system according to an embodiment of the present invention.

FIG. 2 is a perspective view of a fuel tank cooling system according to an embodiment of the present invention. FIG. 3 is a schematic view of a fuel tank cooling system according to an embodiment of the present invention. Tank cooling system.

1 is a structural view of a fuel tank cooling system according to an embodiment of the present invention. The fuel tank cooling system according to the present invention includes a fuel tank cooling system in which a fuel tank 100, in which an inlet 120 and an outlet 140 are formed, (200); A plurality of temperature measuring devices provided on the working die 200 and measuring the temperature of the divided portions of the fuel tank 100; The plurality of injection nozzles 300 are connected to the injection port 120 of the fuel tank 100 to inject the coolant into the fuel tank 100. Each injection nozzle 300 is connected to the corresponding fuel tank 100, A refrigerant injector provided to a divided portion (101, 102, 103, 104) of the injection nozzle (300) and having a control valve (700) for controlling the flow rate or pressure of the refrigerant for each injection nozzle (300); 103 and 104 of the fuel tank 100 from the temperature measuring device and controls the flow rate or pressure of the refrigerant for each injection nozzle 300 through the control valve 700. In the fuel tank 100, And a controller for controlling the control valve 700 such that the higher the temperature of the divided portions 101, 102, 103, 104 of the injection nozzle 300 becomes, the higher the flow rate or pressure of the corresponding injection nozzle 300 becomes.

The fuel tank 100 applied to the present invention is a plastic fuel tank, which aims to uniformly cool the tank over the entire area of the product. The fuel tank 100 has an inlet 120 and an outlet 140 where a filler neck connection can be utilized for the inlet 120 and a separate hole can be utilized for the outlet 140 utilizing the fuel pump connection. It is preferable to perform cooling using a hole formed in an existing product without forming it.

The fuel tank 100 having the injection port 120 and the discharge port 140 is loaded in the work die 200. The work die 200 is provided with a plurality of temperature gauges for measuring the temperatures of the divided portions 101, 102, 103 and 104 of the fuel tank 100. The temperature measuring device can also use an infrared measuring device, and it is also possible to directly measure the temperature by attaching it to the surface of the tank.

The fuel tank 100 can be divided into four parts 101, 102, 103 and 104 as shown in the figure and the temperatures of the four parts 101, 102, 103 and 104 are measured, Cooling.

The refrigerant injector is connected to the inlet 120 of the fuel tank 100 to inject the refrigerant into the fuel tank 100. Particularly, the refrigerant injector is provided with a plurality of injection nozzles 300, and each injection nozzle 300 is provided to face the divided portions 101, 102, 103, and 104 of the corresponding fuel tank 100. A control valve 700 is provided for controlling the flow rate or pressure of the refrigerant for each injection nozzle 300.

As shown, four injection nozzles 301, 302, 303, and 304 are provided, which are inserted into the injection port 120 of the fuel tank 100. The four injection nozzles 300 are embedded in one injection pipe 310 and the injection pipe 310 can be inserted into the injection port 120 of the fuel tank 100. The four injection nozzles 300 The injection nozzles (301, 302, 303, 304) direct the respective directions to the divided portions (101, 102, 103, 104) of the fuel tank. When dividing one circle into four, it is not accurate, but because it is divided into four parts of the fuel tank roughly.

On the other hand, the controller receives the temperature from each of the divided portions (101, 102, 103, 104) of the fuel tank from the temperature measuring device and controls the flow rate or pressure of the refrigerant for each injection nozzle 300 through the control valve 700, The control valve 700 is controlled so that the higher the temperature of the portions 101, 102, 103, and 104, the higher the flow rate or pressure of the corresponding injection nozzle 300 is.

The four injection nozzles 301, 302, 303, and 304 are independently controlled in flow rate or pressure through respective control valves 700. Accordingly, when the temperature of a specific portion is high, the flow rate or pressure of the injection nozzle 300 is increased to lower the temperature of the corresponding portion. As a result, the fuel tank 100 is uniformly cooled to achieve the same strain Thus, the merchantability of the product can be secured.

After the cooling process has been established through the above-described process for the specific type of fuel tank 100, the controller can store it and cool the product continuously according to the stored process. That is, the cooling process is established through the initial test and cooling is performed according to the stored process in mass production.

2 is a perspective view of a fuel tank cooling system according to an embodiment of the present invention, and FIG. 3 is a schematic diagram of a fuel tank cooling system according to an embodiment of the present invention, And the surface temperature of the divided portion of each fuel tank can be measured.

A blower 500 for discharging the refrigerant may be provided outside the fuel tank outlet 140. When the refrigerant is a gas such as air, the refrigerant can be discharged faster through the blower 500 and the cooling rate can be increased.

A plurality of distance measuring devices 400 are provided on the work die 200 and can measure the distance from the surface of the divided portions 101, 102, 103, and 104 of the fuel tank 100. The distance measuring device 400 is provided so that the position can be changed in four rooms. The distance measuring device 400 measures the distance from the surface of the fuel tank by using an infrared sensor or the like, and as the distance increases, the shrinkage progresses according to the curing. The distance change is the degree of shrinkage of the surface of the fuel tank .

The controller receives the temperature and the distance from the temperature measuring device and the distance measuring device 400 for each divided portion 101,102,103,104 of the fuel tank and controls the flow rate or pressure of the refrigerant for each injection nozzle 300 through the control valve 700 The control valve 700 can be controlled such that the higher the temperature of the divided portions 101, 102, 103, and 104 of the fuel tank 100 or the smaller the distance variation is, the higher the flow rate or pressure of the corresponding injection nozzle 300 . That is, if the amount of change in distance is small, there is not much shrinkage yet, and the cooling of the part is further performed.

For reference, the distance variation may be a difference value that is changed from the first distance measured by the distance measuring device.

The controller can provide a control table regarding the temperature, the distance variation, and the injection nozzle control value in the form of a data map, and calculate the injection nozzle control value by substituting the measured temperature and the distance variation. An example of a data map of the controller is as follows.

Figure 112015126189197-pat00001

According to the data map, temperature and dimensional changes are measured for each divided part of the fuel tank, thereby independently controlling each corresponding control valve so that even cooling can be performed. When the temperature and the dimensional change are used as data, it is possible to select a higher or lower step among the steps corresponding to the temperature and the dimension corresponding to the dimensional change, and to set the pressure of the refrigerant corresponding thereto.

In the case of controlling the cooling based on the temperature, the following process is exemplified.

1) If the zone 1 temperature is more than 50 ° C: The valve No. 1 of the nozzle is ON and the pressure of 2 bar is supplied (Steps 1 ~ 4)

2) If zone temperature is below 30 ° C: Nozzle No. 2 turns off.

3) When zone 3 temperature is below 30 ℃: Nozzle No. 3 OFF

4) If the zone temperature is 41 ° C: Turn on the nozzle 4 times and supply 1.5 bar pressure (2 ~ 4 steps)

According to the fuel tank cooling system of the present invention, the fuel tank of the vehicle can be controlled to cool evenly in cooling after forming the fuel tank.

Particularly, it is possible to secure the quality of the product in a lump by applying the cooling process to the product to be produced after establishing the cooling process for the specific product using the controller.

While the invention has been shown and described with respect to the specific embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the following claims It will be apparent to those of ordinary skill in the art.

100: fuel tank 120: inlet
140: exhaust port 300: injection nozzle
500: Blower

Claims (9)

A work die on which a fuel tank having an inlet port and an outlet port is loaded;
A plurality of temperature measuring devices provided on the work die and measuring the temperature of the divided portions of the fuel tank;
A plurality of injection nozzles are provided, each of the injection nozzles is provided to face a divided portion of a corresponding fuel tank, and the flow rate of the coolant or the flow rate of the coolant for each injection nozzle A refrigerant injector provided with a control valve for controlling pressure; And
The control unit controls the flow rate or pressure of the refrigerant for each injection nozzle through the control valve so that the higher the temperature of the divided portion of the fuel tank is, the higher the flow rate of the corresponding injection nozzle And a controller for controlling the control valve to increase the pressure. The method according to claim 1,
Wherein the temperature measuring device is provided on each of the surfaces of the divided portions of the fuel tank to measure the surface temperature of the divided portions of the respective fuel tanks. The method according to claim 1,
Wherein the refrigerant injector includes a plurality of injection nozzles embedded in one injection pipe, and the injection pipe is inserted into the injection port of the fuel tank. The method according to claim 1,
And the outlet of the fuel tank is a fuel pump coupling portion. The method according to claim 1,
And a blower for discharging the refrigerant is provided outside the fuel tank outlet side. The method according to claim 1,
And a plurality of distance measuring devices provided on the work die and measuring distances to the surfaces of the divided portions of the fuel tank. The method of claim 6,
The controller receives the temperature and the distance from each of the divided portions of the fuel tank from the temperature meter and the distance meter and controls the flow rate or pressure of the refrigerant for each injection nozzle through the control valve so that the higher the temperature of the divided portion of the fuel tank Or the control valve is controlled such that the flow rate or pressure of the corresponding injection nozzle increases as the distance variation is smaller. The method of claim 7,
Wherein the controller is provided with a control table related to the temperature, the distance variation and the injection nozzle control value in the form of a data map, and derives the injection nozzle control value by substituting the measured temperature and the distance variation. The method of claim 7,
Wherein the distance change amount is a difference value that is changed based on a distance measured first by the distance measuring device.
KR1020150184606A 2015-12-23 2015-12-23 System for cooling fuel tank KR101690030B1 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR19990010600A (en) * 1997-07-18 1999-02-18 박병재 Mold temperature automatic control system
JP2000280333A (en) * 1999-04-02 2000-10-10 Yachiyo Industry Co Ltd Cooling device of blow molding
JP2002361721A (en) * 2001-06-05 2002-12-18 Japan Steel Works Ltd:The Method and device for collecting producing data for plastic fuel tank
KR20050093770A (en) 2003-01-10 2005-09-23 캐논 에스.피.에이. Twin-sheet thermoforming of plastic fuel tanks

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR19990010600A (en) * 1997-07-18 1999-02-18 박병재 Mold temperature automatic control system
JP2000280333A (en) * 1999-04-02 2000-10-10 Yachiyo Industry Co Ltd Cooling device of blow molding
JP2002361721A (en) * 2001-06-05 2002-12-18 Japan Steel Works Ltd:The Method and device for collecting producing data for plastic fuel tank
KR20050093770A (en) 2003-01-10 2005-09-23 캐논 에스.피.에이. Twin-sheet thermoforming of plastic fuel tanks
KR100947701B1 (en) * 2003-01-10 2010-03-16 캐논 에스.피.에이. Twin-sheet thermoforming of plastic fuel tanks

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