CN101208188A - Method for producing a fuel tank provided with internal accessories - Google Patents

Abstract

Method for producing a fuel tank provided with internal accessories and having a wall made of plastic made in a single piece by moulding a split parison or a parison in at least two parts, said method comprising the following steps: a) the parison is introduced in the heat-softened state into a mould comprising dies; b) a core on which the accessories are placed is introduced inside the parison; c) the parison is pressed onto the dies of the mould; d) the accessories are fastened to the parison with the aid of the core in an ideal layout; e) the core is withdrawn and the mould is closed; f) the tank is moulded from the parison; and g) the tank is removed from the mould.

Description

Be used to produce the method for the fuel tank that is provided with contents

The present invention relates to a kind of method that is used to produce fuel tank, this fuel tank (at least in part) be provided with a plurality of contents and particularly one make described casing (fuel tank, tank) inside and outside carry out the parts that fluid is communicated with.

Onboard fuel system on the dissimilar vehicles generally includes some devices, and these devices provide ventilation for the hydrocarbon (hydrocarbon) that is contained in the casing.They can also be included as the device that engine provides fuel.This type of device is being contained in the parts of box house (valve, petrolift etc.) and is being positioned at formation connection between its outside parts (canister, filling tube (charge pipe, filling pipe) etc.).The manufacturing of the passage by this box body wall must consider that (LEV II for example, PZEV) regulation prevents the requirement of leaking to existing environmental standard.For this reason, number of openings and the size that reduces on this box body wall constitutes a favorable factor that reduces evaporation loss.Yet this makes in casing and to insert and the placing component difficulty more that becomes.

In addition, casing is equipped with closed circuit (circuit) (for example be used for ventilate, fuel supply) usually, comprise be positioned at box house and, according to possible situation, be connected to the parts that are positioned at the casing outside conduit (pipeline, pipe), valve, midget tube etc.Now, when box house is communicated with by tank wall formation fluid with the outside, might in pipeline, form siphon according to the position (for example a flat position) of tank wall upper shed.Under the situation of ventilation circuit, they constitute a shortcoming, because can be caused the fault of this ventilating system by the accumulation of the liquid that steam transmitted.In addition, under the situation of fuel supply line, might this flat position relate to described conduit one detour (circuitous, detour) or one section unnecessary length.

At last, casing generally includes other annex, the baffle plate of one or more anti-fluctuation (and relevant antinoise) for example, and one is used for the device that will liquid be separated with steam, one or more meters that are used to measure fuel level, a reserve tank (reserve tank) etc.The latter's purpose be for prevent when motor vehicle fuel exhaust or it in the slope position storage period when long, pump can not inject.It is provided with a valve (" first injection valve ") usually, feasible when casing is reinforced for the first time and/or after running out of gas, make it might material feeding, and its size be subject to usually in order to put it in the casing and the size in the hole of making on casing.

All these contents (more precisely partial interior annex) at least all be usually casing is molded finish after by dividing other operation to place/be attached to its inside, other operation of this branch expends time in and labour and be expensive therefore.In addition; as mentioned before, consider the size and the quantity that will be reduced to the perforate (orifice) of introducing described annex tank wall, attempt they are gathered together through regular meeting; therefore, their position is not best (performance of described annex is not optimised in other words).

Application EP 1110697 with the applicant's name has disclosed a kind of method that is used for molded fuel tank, and (parts have used parison so that can when casing is molded these annexes be inserted into wherein in part) to this method at several sections.Consider and to reduce the number of components of waiting to introduce and be fastened to box house, the document recommends to use the pre-assembled structure, this has solved the problem of open amount and whole duration in molded cycle (moulding cyclc), but can't thoroughly solve the problem that different accessory position are optimized.Therefore, the object of the present invention is to provide a kind of method that can address this problem, and this be by means of use an independent support member (being called as " chipware ") thereon these annexes be placed in the desirable layout and its makes and might in an independent step described annex be anchored on their ideal positions in casing.Specifically, change in the example at one, the method according to this invention makes might produce a kind of fuel tank that is made of plastics, the fluid that it has between described casing inside and outside is communicated with, this is to reduce sized opening by one, its position can freely be selected therefore can prevent to produce detouring of siphon and/or pipeline, and this is to realize by a kind of method that relates to the minimal steps number.

For this reason, the present invention relates to a kind of method that is provided with a plurality of contents and has the fuel tank of a tank wall that is made of plastics that is used to produce, this fuel tank is by a molded parison of riving or comprise that the parison of two parts (part) is made a single (integral piece at least, single piece), said method comprising the steps of:

A) under the state of thermal softening this parison is being incorporated among the mould that comprises a plurality of pressing molds (die);

B) chipware having placed these annexes on it is incorporated into this parison inside;

C) this parison is pressed onto on these pressing molds of this mould;

D) these annexes are fastened on this parison with a desirable layout by means of this chipware;

E) remove and (recall, regain, withdraw) this chipware and close this mould;

F) with molded this casing of this parison; And

G) from mould, shift out this casing.

In background of the present invention, " annex " is understood that to represent the assembly (assembling of parts or a plurality of parts, assembly), it has an initiative function (active function) and for example is used for ventilating in casing, be used for transfer the fuel to engine, be used to measure fluid level (liquid level, liquid level), be used to reduce the noise relevant etc. with fluctuation.Especially, it comprises the assembly of parts or a plurality of parts, and its function can be according to it or they position and be optimised.Especially, it can comprise a draft tube liner and/or fuel or supply of electric power pipeline, therefore (so that prevent to form siphon and/or be used to optimize the length of described pipeline and/or be used to increase the dischargeable capacity (swept volume, working volume) of casing) can freely be selected in its exit point position.Similarly, it can comprise the baffle plate of one or more anti-spilling, and its acoustical behavior depends on the position of one or more fuel metering device especially, and the certainty of measurement of this meter also depends on this position.The present invention is applicable to especially well between box house and outside and sets up the parts that fluid is communicated with, for example previously described ventilation and fuel supply lines, because change example according to one, it can also obtain a fluid that does not leak fully and be communicated with.

According to this variation example, in step b), introduced at least a portion of the parts that comprise a conduit being used for the fluid passage and/or a perforate in this parison inside; And, in step d), these parts partly are secured on the parison, this method that changes example additionally comprises a step according to the present invention, in the process of this step, on the tank wall of casing, made an opening, this aperture position is limited in these parts and partly is fastened on the position of this parison, thereby this opening or conduit discharged thus and allows box house to be communicated with fluid between the outside.

Fuel tank is understood to mean under service condition and anti-leak casing that can storage of fuels under various and different environmental conditions.An example of this casing is mounted in the casing on the motor vehicles.

Fuel tank according to the present invention is made by plastic wall, generally comprises an inner surface (inner face, inner face) and a outer surface (outside) on its projection on its recessed portion.

Plastics are meant any material that comprises at least a polymer of being made by synthetic resin.

All types of plastics all are suitable.Specially suitable plastics belong to the classification of thermoplastic.

Thermoplastic is meant any thermoplastic polymer, comprises thermoplastic elastomer (TPE) and their mixture.Term " polymer " " be meant homopolymers and copolymer (particularly binary or ternary).The example of such copolymer is, on a kind of nonrestrictive meaning: have a kind of copolymer of random distribution, copolymer (alternate copolymer, sequenced copolymer), block copolymer and the graft copolymer that order is arranged.

Thermoplastic polymer or copolymer that its fusing point is lower than any kind of decomposition temperature all are suitable.The synthetic thermoplastic material of fusion range (melting range) expansion above at least 10 degrees centigrade is particularly suitable.As an example of such material, be the material that those its molecular weight have polydispersity.

Especially, can utilize polyolefin, thermoplastic polyester, polyketone, polyamide and their copolymer.Also can use the mixture of polymer or copolymer, and the mixture of polymeric material and inorganic, organic and/or natural stuffing, for example, on a kind of non-limiting meaning: carbon, salt and other inorganic derivative, natural or polymer fiber.Also might use the sandwich construction of forming by the tack coat that piles up, comprise at least a in above-described polymer or the copolymer.

Often a kind of polymer that adopts is a polyethylene.High density polyethylene (HDPE) (HDPE) has been obtained excellent result.

Preferably, the casing that will produce according to the inventive method comprises a kind of sandwich construction, this sandwich construction comprises one deck thermoplastic and at least one extra play at least, and advantageously, this extra play can comprise that to liquid and/or gas be a kind of material of a separation layer.

Preferably, characteristic of this separation layer (barrier layer) and thickness are selected as farthest limiting the permeability with the contacted liquids and gases of tank wall of casing.Preferably, this layer is based on a kind of isolated material, and is promptly a kind of to fuel-tight resin, for example EVOH (vinyl-vinyl acetate copolymer of partial hydrolysis).Replacedly, this casing can carry out surface treatment (fluorination treatment or sulfonation are handled), and purpose is to make it impermeable to fuel.

Parison, be interpreted as being meant a kind of prefabrication (preform, preform), usually be extruded and for arbitrary shape, be generally flat basically or tubulose, it is intended to be used to constitute after molded the tank wall of casing, in other words in time processing (operation, operation) afterwards, this processing is included in desired shape of parison and the size that gives under the help of mould under the thermal softening state, so that obtain the casing of whole (one piece).

The method according to this invention has adopted a chipware.This is interpreted as being meant that the parts of a suitable dimension and form are so that can be inserted between the cavity of this mould.For example patent GB 1,410, described such parts in 215, and its content is introduced among the application as a reference.In the context of the present invention, the major function of this chipware is that these annexes are settled and are fastened on the parison.When these annexes are fastened by welding, this chipware can be provided with heater block (for example speculum (mirror)), it is hot (except that this chipware, this part is generally for example heated by infrared heating in advance) that this heater block keeps accessories section to be welded.In the process of settling these annexes (seeing below literary composition), can in this zone that will contact or a plurality of zone, provide heater block (for example heater strip (filament)) with parison.

Should notice that preheating these parts should not be to carry out forcibly under the background by the fastening parts of welding on chipware.For example speculum (or other preheats instrument) can be placed on the framework of machine and not need to form the part of chipware.On the other hand, this speculum (or other preheats instrument) need be placed in the suitable time on the suitable position so that can preheat these parts.

This chipware can also be used under pressure gas being blown into this mould so that this parison is pressed onto the pressing mold of this mould.It helps molded this casing by this way, even provides the major part of this parison distortion (to be generally and to obtain 80% of the desired distortion of this casing, even be 90% and even 95% rank before these annexes are fastened.)

For this reason, this chipware has at least one perforate this chipware inner space is connected to a triple valve, and it is connected to an external source of air under the pressure on the one hand, and on the other hand, is directly connected to atmosphere.In the blow molding first time (blowing, blow moulding) process, this controlled triple valve is connected to chipware with air accumulator, in this way in chipware and mould, discharge gas (air, air).When this blow molding end for the first time, to open before this mould, this chipware must be communicated with atmosphere, and this realizes that by the control triple valve this moment, the gas volume with chipware was in communication with the outside.Alternate design is to form two perforates on this chipware, with two difference controlled 2 lead to valves, one is connected to this air accumulator and another is connected to atmosphere.

Air is calculated as a given flow by a single perforate (diameter that has two inches ideally) and is injected in this chipware, perhaps is injected in this chipware by a hole that is provided with a blow molding nozzle.So this nozzle sprays air directionality arranged, and to prevent that by this way air-flow is to a heater block or be mounted in any impact of parts in the casing.

The above-described pre-molded loop of blowing (perhaps being used for the blow molding in this chipware) that is used for is totally independent of the expansion circuit that guarantees second blow molding.

Finally, this chipware can also be used to control at least in part this method.For this reason, for example a video camera can be packed in this chipware and (to be manifested, visualize) and the quality that connects of monitoring annex for use in controlling by graphical analysis.One or more sensor that is used for the numerical value of ergometry, stroke, pressure and temperature also can be installed on this chipware so that more effectively monitor the connection of annex.

In the method according to the invention, these contents are secured on the parison according to a kind of desirable layout by means of this chipware.This is interpreted as being meant that at least wherein some obtain locating makes that their performance is optimised.Preferably, this layout performance and/or its work internal capacity of this casing that made global optimization.In order to make chipware carry out this location, advantageously before the pressing mold that carries this parison surrounds the chipware carry these annexes with these annexes on the pre-aligned relevant position at pressing mold.In other words, they by pre-aligned on this chipware so that they all are positioned as close to corresponding ideal position on pressing mold when this mould is closed.

Also maybe advantageously (jack jack) makes parts pass through welding or the riveted joint quilt is firmly fastening for this chipware provides one or more eyelid retractors.

In the method according to the invention, this casing is by a parison of riving or have two-part parison at least and be molded into one single (casing that is obtained after an one step is one single, do not need other to assemble the complementarity step of dividing other shell), and this normally passes through weld separation or two-part parison when mould is closed.Particularly advantageous is that this casing is molded by following steps:

● blow molding that is to say by a pressure fluid to comprise that the tubular parison of at least one cut-out expands and is expressed on the wall of a mould (described in application EP1110697, with its content by reference in conjunction with in this application);

● thermoforming sheet material that is to say by on the wall that presses them against a mould, for example by create swabbing action (formation vacuum) in their back.

In the method according to the invention, this parison of so-called formation (that is to say its distortion so that obtain the shape of casing basically) mainly occurs in the process of step c).In the process of step f) (wherein carrying out above-mentioned welding), keep pressure (or suction force) simply to guarantee the dimensional stability of casing.

Under the situation of blow moulded tank, after extruding a single tubular parison, latter's (tubular parison) on its length by all or part of incision, preferably along two diametrically opposite lines.

Compare with two extrusion plates of blow molding respectively, and it is constant on thickness, this processing method makes it to use the parison (that is to say on length non-constant) of variable thickness, this obtains (a common extruder is provided with a pressing mold, and this pressing mold has the adjustable drift in position (plunger)) by a suitable pressurizing unit.This parison is considered reducing of thickness on some position of parison that in blow molding process material takes place after the irregular deformation extent in mould.

Preferably, this casing comes molded by blow molding.In fact, thermoforming is usually directed to mold heated to 60 ℃ so that can realize degree of depth distortion (for example at casing corner parison by high elongation).Consequently cycle time longer than blow molding, and this constraint does not exist blow molding.

For this reason, the pressing mold of this mould cuts out at this chipware place usually in the process of step c) and step d), and they contact with it and limit a sealing area at this chipware either side in other words.Perhaps more precisely: because these pressing molds carry this parison, this chipware contacts with this parison, so this parison is clamped between the pressing mold of chipware and mould.This contact area is preferably placed at outside the welding region.If comprise with the contact area of chipware/be exactly the welding region of this parison, then preferably in this contact area, heat chipware to guarantee welding.So it becomes the sealing first time of this mould to a certain extent, this chipware is inserted into therebetween and contacts with pressing mold, and is blown into by current sealing gas-pressurized (being generally air).Usually, this zone is positioned at the periphery of pressing mold and often also at the periphery of this chipware.This of this mould seals for the first time and constitutes so-called " it is molded to blow in advance " (perhaps blow molding) for the first time.

This gas pressure is preferably greater than or equals 1 crust in the pre-molded step of blowing, and is preferably 2 crust, or even 3 crust.Yet it is less than or equal to 6 crust usually, preferred 5 crust.

After the sealing second time of this mould, the gas pressure that is used for blow molding is generally higher, is typically greater than 6 crust, is preferably 7 crust.Yet, advantageously be not more than 10 crust.

In each step of blow molding, gas pressure advantageously reduces (applying vacuum) with a pressure of pressing mold (the perhaps Wai Bu part) back of mould and combines.This pressure reduces preferably hundred millibars rank (typically between 100 to 500 millibars, preferably between 200 to 400 millibars).

In passing through the molding process of blow molding, the method according to this invention also comprises a degassing step, and this is to carry out before each opens mould, that is to say at step e) and g) before.

This degassing step can realize with a suitable manner.Usually, this parison at first be pierced (for example with acupuncture broken) then fluid from this mould, release (for example by means of valve).Come under the molded situation by thermoforming at casing, this mould need be in sealing on the chipware not to be pressed onto the latter (because compacting is to realize rather than come blow molding by chipware by suction under the latter) on the pressing mold.

Change (wherein casing is by molded by the blow molding of this chipware realization to small part) in the example at of the present invention this, to what the pre-air blowing by means of this chipware was molded with profit be, this parison has had the size (perhaps in other words, the distortion of this parison is that occurring in this step basically is not when sealing the second time of this mould) of casing basically.

In the process of the method according to this invention, preferably (when this parison is crushed on the pressing mold so that these annexes are fastened on the parison) has a device to prevent that the slit of this parison each several part or edge are welded in together in the first time of this mould closed process.This device advantageously comprises in this chipware.For this reason, this chipware preferably has a suitable shape and size is had between the part at (edges of the antelabium in slit or two parts) to be welded so that partly (comprise the part that it is peripheral usually at least) and be inserted into this parison.In order to help the welding in the step f), the pressing mold of this mould has been advantageously provided a hot adjusting device, and this device makes that welding region is by suitable heating in the process of the correlation step that mould seals for the first time.

As mentioned before, this chipware also can comprise such device (being used for heat adjustment) in one or more contact areas of it and parison, and this is particularly comprising under the situation of previously described welding region.This variation example can further improve the welding quality (by reducing the resistance to impact that therefore this internal bead also improves casing) of casing.A unit describe like this in application FR 04.13407 for example with the applicant's name, with its content by reference in conjunction with in this application.

According to first preferred variant, these annexes that are secured on the parison by means of this chipware comprise a reserve tank, are used to prevent for example go into failure at short bunker or the long-time infusion that causes of stopping on the slope.By means of method of the present invention make it not only freely to select this casing volume (therefore can by for large-size of its selection to satisfy the specification requirement of all car manufactures), and the position that can also optimize the latter makes it to be directly connected to filling tube (optional by a leakproof flexible connector (making and/or make corrugated by rubber)), avoids seeking help from one as previously described " first injection valve " with this.Change in the example at this, the check valve (ICV) that is present in this filling tube bottom usually can advantageously be incorporated in the flexible connector mentioned above, and this is the reason in order to be easy to assemble.

The casing that this changes example according to the present invention can be secured on the parison by any suitable mode (welding, over-molded (overmoulding), blind rivet riveted joint (pop-riveting)).The blind rivet riveting technology is particularly suitable for.

According to another preferred variant that preamble has been mentioned, at least one annex comprises and is provided with the conduit being used for fluid passage or the parts of opening.Change these parts of mentioning in the example at of the present invention this and be meant an object that allows fluid (steam and/or liquid) between this fuel tank is inside and outside, to circulate.It can comprise a ductule, a valve or the like.It advantageously comprises at least a portion of the fuel supply lines of draft tube liner or casing.

This object preferably comprises a pedestal (base), is generally a flat form, and at least one molded component (profiled part) or conduit.Periphery and this conduit that this pedestal has a circle usually have a shape of cylinder basically usually.In a preferred mode, when these parts were secured on the tank wall of this casing, this conduit to small part was positioned at the casing outside.For example this is used to connect under the situation of a ventilation circuit at these parts, and it can proceed to the connection of a canister.Be used to be connected at these parts under the situation of fuel supply lines of engine, it can also proceed to the connection of this engine.It should be noted that these parts can comprise one second conduit, be used for inner draft tube liner or the burning line that connects to come self-pumping.In this case, advantageously, described internal pipeline just was connected to these parts before being secured to tank wall, and this exterior tubing is finished and the just connection after (cooling) that is shaped of preferred casing molded.

Be communicated with fluid between the outside by setting up this box house, these parts become a network of the assembly of a plurality of elements that communicate with each other usually.

These parts can be with having suitable mechanical strength and the corrosion resistant any material of chemicals (fuel) being made.Preferably make by metal or plastics.Plastics are because of its lightness and be easy to use preferred.Various forms of plastics all may be fit to.Preferably, select a kind of plastics, it is standing to have dimensional stability preferably under the variations in temperature of tens of degrees centigrade of scopes.Also preferably select a kind of plastics, its dimensional stability is not subjected to for example to be contained in the liquid that is in contact with it in the casing and the influence of gas, and is impervious.Polyacetals, polyamide, polyester and polyvinyl halides (polyvinyl halide) have provided good effect.The plastics that are well suited for are polyacetals and particularly POM (perhaps polyformaldehyde).In a particularly preferred mode, these parts are made by injection moulding, form by the injection molding technology under the pressure in a mould in other words.

These parts can be based on fuel being had the material of hypotonicity or being made by polyethylene.Preferably, when this parts during, it is handled so that reduce its permeability based on polyethylene.This processing for example comprises sulfonation processing or the fluorination treatment to parts.

Change example according to of the present invention this, at least a portion of these parison parts is to be connected in the process by molded production casing, in other words before the step e) of mould sealing.

The part of these parts is fixed on the parison by any suitable mode.Usually, it comprises support member of use.Support member is interpreted as representing a movable part that can temporarily be fastened to this parts part, so that it can be introduced into this parison and can be connected to there (being fastened on its inner tank wall).Conventional blow molding method is often used a blow molding blowpipe, and it designed to be used the parison inside that pressure fluid is blown into this mould.This blowpipe can serve as a support member.Replacedly, a mechanical arm can be used as a support member.This solution is quite suitable under the molded situation of thermoforming.At last, if used chipware, the latter can play the effect of a support member in the method for moulding.

Because the removable characteristic of this support member (chipware), these parts are positioned in parison inside, in case when these parts reach the tram, these parts promptly are secured to (on the part of its inner surface) on the parison.Any tightening technology well known by persons skilled in the art can be applied in the background of the present invention.For example can this chipware auxiliary down, by the blind rivet riveted joint or on the contact area of parts and parison the mode of welding material these parts are fastened on the parison.Also might be at this parison auxiliary down to carrying out over-molded (overmould) to these parts of small part and/or these parts being welded to (under the suitable situation of material) on the described parison.

In case after these parts had been secured on the parison, in the time of suitably, this support member was promptly withdrawn from from mould, and this mould seals on parison to produce this casing then.

This method that changes example additionally comprises a step according to the present invention, makes an opening and this can form the part of this method of moulding or become its further part in the process of this step on the tank wall of casing.When in molding process, making this opening, it preferably when parison is under pressure with this parison of needle-penetration.In this case, mobile being easy to of this pin will advantageously be removed after this casing is molded at burr (spur) and this burr of the periphery of this opening formation material.

Therefore, in a preferred mode, this opening is to make after casing is molded into again, and for example passes through the part on the tank wall surface of this casing of excision.

Change example according to of the present invention this, these parts can comprise one or more assembled components.

Change example according to one first, these parts comprise one single, and it comprises that a conduit and this part are fastened so that it passes through the opening of the tank wall of this casing.This shortcoming that changes example be described parts be secured on this parison so that this conduit by before this tank wall, the opening on the tank wall of this casing must create when molded housing.Now, in this case, so this parison be malleable described opening shape no all roses and may be on the casing of finishing (cooling) following process.

Change example according to one second, this is preferably (to produce this opening because its allows to be molded the back at casing), these parts comprise at least two parts, each be provided with a conduit or perforate and after step f) this second portion be secured in this first or be fastened to the edge of the outside tank wall upper shed of this casing so that the conduit of these parts/perforate allows fluid to pass through between this box house and outside.For example, it can be connected to this second portion on the tank wall of this casing on by the outer surface that is welded to this casing on the described edge of opening.Replacedly, these two parts can be provided with the apparatus for assembling that can cooperate together so that these second parts are connected on first parts.

In that this changes in the method for example according to the present invention, the opening of making on the tank wall of these parts by this casing allows to be communicated with fluid between the outside at this box house in a kind of mode of anti-leak basically.

Anti-leak is understood to be in relation to liquid and/or the gas that is contained in this casing under the condition of the N that casing uses.

Preferably the existence of a compressive seal between the tank wall of a surface by being inserted in these parts and this casing has guaranteed this leak-proof for liquid and gas.Employed seal can have several shapes.For example it can comprise an O type circle.O type circle with a circular cross-section has produced good effect.

This compressible seal member is made by a kind of elastoplast or rubber usually.Preferably, the material of sealing part is selected as a kind of material that the liquid that contacts with this casing concave surface and gas are inertia.

The sealing part preferably inserts in the groove, and it is compressed when being fixed to the tank wall of casing with these parts of box lunch.

When casing had a kind of tank wall of sandwich construction, these parts advantageously were positioned as and make this O type circle contact with a separation layer of this casing.

When hope with parts, for example be connected to the ductule in an inner ventilation loop, when being connected to this parison, a kind of special circumstances have been considered, this loop generally includes one or several valve and one and be used for a casing (be trapped in the canister so that prevent liquid fuel droplet, a kind of like this device is indispensable) that liquid is separated from steam after vehicle zero-emission standard (" ZEV " standard of the U.S.) is implemented.The step of method begins from the above description, and this ductule (and being provided with its valve and the ventilation circuit of its casing suitably the time) at first is connected on this chipware.Then, the chipware that carries this ductule is introduced in the parison and this mould is closed.Blow and/or by the suction in the vacuum of pressing mold rear side, parison is crushed on the pressing mold of this mould through this chipware.

In the process of this step, keep balance between pressure in the parison and the pressure in the ventilation circuit, this pressure equals the pressure of blow molding.So this ductule is connected on the parison under this chipware auxiliary, and this mould is outgased and opens so that take out chipware then.In this stage, the pressure that the pressure in this parison equals in atmospheric pressure this ventilation circuit simultaneously is maintained blow molding pressure.In fact, because this parison is usually along the axis orientation of a perpendicular, these valves are about an angle of 90 degrees with respect to vertical direction along an axis orientation with respect to the substantial lateral of this parison in other words.

These valves are closed usually in this case, are trapped in this ventilation circuit this blow molding fluid section.Because this ventilation circuit is not complete leakproof usually, therefore pressure in the described loop trend towards atmospheric pressure, because, no matter their direction, owing to their geometry and owing to the positive differential pressure that forms between pressure in the ventilation circuit and the pressure in this parison, these valves have a tendency of opening.

This mould is closed so that be blown into fluid under pressure then.At this moment, the pressure in this ventilation circuit maintains the atmospheric pressure level and is not reached once more and the blow molding pressure balance, because these valves are closed once more, is because the Negative Pressure Difference that exists between the inside of this ventilation circuit and the outside specifically.When the method according to this invention was proceeded, this ventilating system was born a high pressure (equaling this blow molding pressure, for example is 10 crust) usually and this can cause the damage of these valves.In order to remedy this shortcoming, advantageously by the pressure balance between this ventilation circuit and the box house is provided in perforate of manufacturing on the ductule of the tank wall that is connected to this casing.Described perforate will will be closed after the stage at blow molding.

It should be noted that at last in the context of the present invention, may be favourable for this chipware provides " drip molding (forms) " (or forming tool), and these drip moldings have adjustable temperature and its purpose is to help to improve thickness distribution.In case this mould is closed (so that connecting these annexes) first on chipware, a plurality of eyelid retractors can move these drip moldings and follow and make material forming and extension (so that improving thickness distribution).

The purpose of Fig. 1 to Fig. 3 is to illustrate concrete aspects more of the present invention, and limits its scope never in any form.

Fig. 1 has shown two parts (2,3) of parts, one of them part (2) be soldered to a fuel tank tank wall (1) inner surface and another part (3) is soldered to its outer surface.These two parts (2,3) are placed on the edge of an opening of making on the tank wall (1) of this casing.

Fig. 2 has shown the parts with single piece (2), and it is soldered on the inner surface of tank wall (1) of a casing and a part (with a catheter shape) is passed the opening of making on the tank wall (1) of this fuel tank.Because these parts are one single and comprise a conduit that must pass the tank wall (1) of this casing, when this parison when molded, must before described parts are secured on the parison, make the perforate on this tank wall.Therefore the existence of making mobile formed two burrs (1 ') of the employed pin of opening on the tank wall of casing in molding process will be observed.These burrs (1 ') are removed in a completing steps.

The corresponding embodiment of Fig. 3, an one parts comprise the inner lip-deep part (2) of the tank wall (1) that is welded to this casing and are provided with apparatus for assembling.These apparatus for assembling match with the apparatus for assembling of a second portion (3) of these parts in this casing partly.This part (3) comprises an O type circle (5), and it contacts with a separation layer (4) among the sandwich construction that is included in this tank wall (1).

Claims (16)

1. be used to produce the method for fuel tank, this fuel tank is provided with a plurality of contents and has a tank wall that is made of plastics, this fuel tank is made one single by a molded parison of riving or a two-part at least parison, said method comprising the steps of:

A) under the thermal softening state, this parison is incorporated in the mould that comprises a plurality of pressing molds;

B) chipware that will be placed with these annexes thereon is incorporated into this parison inside;

C) this parison is pressed onto on the pressing mold of this mould;

D) down these annexes are fastened on this parison with a desirable layout the auxiliary of this chipware;

E) this mould is removed and closed to this chipware;

F) be molded into this casing by this parison; And

G) this casing is shifted out from this mould.

2. according to the described method of aforementioned claim, wherein, at least one annex is selected from a draft tube liner, fuel or supply of electric power pipeline, one or more anti-fluctuation plate, a reserve tank and a fuel metering device.

3. according to the described method of aforementioned arbitrary claim, wherein, be combined with a video camera in this chipware and/or at least one is used to measure for example sensor of the numerical value of power, stroke, pressure and temperature.

4. according to each described method in the aforementioned claim, wherein, at least one annex comprises parts, these parts are provided with and are used for a conduit and/or perforate that fluid passes through, and according to this method in the process of step b), at least a portion of these parts is introduced in this parison inside, in the process of step d), these parts partly are secured on this parison, this method comprises a step in addition, wherein on the tank wall of this casing, make an opening, this opening is limited in wherein that these parts partly are secured on the position of this parison, so that make this opening or catheter patency and allow this box house to be communicated with fluid between the outside.

5. according to the described method of aforementioned claim, it is characterized in that these parts are made up of one single (2), this single comprises that a conduit and this conduit are fastened into this opening that makes on its tank wall that passes this casing (1).

6. method according to claim 4, it is characterized in that, these parts comprise at least two parts (2,3), each is provided with a conduit or perforate and will part (3) after step f) be connected to the tank wall (1) that part (2) went up or be connected to this casing outside and goes up on the edge of this opening, makes conduit/perforate of these parts (2,3) allow fluid to pass through between this box house and outside.

7. according to the described method of aforementioned claim, it is characterized in that, on the edge of the described opening of the tank wall (1) of this part (3) by being secured to this casing on the outer surface that is welded to this casing.

8. method according to claim 6 is characterized in that, each in these two parts parts (2,3) comprises apparatus for assembling, and its feature also is, partly (3) are positioned in part (2) and go up so that described apparatus for assembling is cooperated jointly.

9. according to the described method of aforementioned arbitrary claim, it is characterized in that this casing comprises a sandwich construction, this sandwich construction comprises at least one thermoplastic layer and at least one separation layer (4).

10. according to the described method of aforementioned claim, it is characterized in that, at least one annex comprises parts, these parts are provided with and are used for a conduit and/or perforate that fluid passes through, and are characterised in that these parts are provided with an O type circle (5) and feature is that also these parts are positioned such that described O type circle (5) contacts with the separation layer (4) of this casing.

11., it is characterized in that these parts are based on polyethylene and passed through a kind of surface treatment, perhaps based on a kind of material that fuel is had hypotonicity according to the described method of aforementioned claim.

12. according to each described method in the aforementioned claim, it is characterized in that, these annexes comprise an inner ventilation loop, this loop is provided with at least one valve and a ductule, be characterised in that molded and feature is that also this ductule has a perforate to this casing by blow molding, this perforate is closed behind this casing blow molding.

13. method according to claim 1 and 2 is characterized in that, these annexes comprise a reserve tank, and the position of this reserve tank is selected as making it directly to be connected with a conduit that feeds in raw material for this casing.

14., it is characterized in that the connection between this reserve tank and this filling tube is to carry out down one that is combined with a check valve flexibly connect auxiliary according to the described method of aforementioned claim.

15., it is characterized in that this reserve tank is to be secured on this parison by the blind rivet riveted joint according to claim 13 or 14 described methods.

16. according to each described method in the aforementioned claim, wherein, this chipware is provided with at least one drip molding, this drip molding has adjustable temperature and is driven so that it follows the shaping and the extension of these plastics by an eyelid retractor.