CN104736320A - Method for forming a container by stretch-blowing wherein part of the wall of the container is not moulded - Google Patents
Method for forming a container by stretch-blowing wherein part of the wall of the container is not moulded Download PDFInfo
- Publication number
- CN104736320A CN104736320A CN201380055086.1A CN201380055086A CN104736320A CN 104736320 A CN104736320 A CN 104736320A CN 201380055086 A CN201380055086 A CN 201380055086A CN 104736320 A CN104736320 A CN 104736320A
- Authority
- CN
- China
- Prior art keywords
- preform
- profile
- wall portion
- main body
- container
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 76
- 238000007664 blowing Methods 0.000 title claims abstract description 26
- 238000007493 shaping process Methods 0.000 claims abstract description 35
- 230000009477 glass transition Effects 0.000 claims abstract description 21
- 238000000465 moulding Methods 0.000 claims abstract description 11
- 239000012530 fluid Substances 0.000 claims description 34
- 230000008569 process Effects 0.000 claims description 25
- 238000001125 extrusion Methods 0.000 claims description 16
- 238000002347 injection Methods 0.000 claims description 9
- 239000007924 injection Substances 0.000 claims description 9
- 229920001169 thermoplastic Polymers 0.000 claims description 7
- 239000004416 thermosoftening plastic Substances 0.000 claims description 7
- 238000000071 blow moulding Methods 0.000 claims description 5
- 238000001816 cooling Methods 0.000 abstract 1
- 210000003739 neck Anatomy 0.000 description 30
- 239000000463 material Substances 0.000 description 14
- 230000004048 modification Effects 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 4
- 239000011521 glass Substances 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- 230000001788 irregular Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229920005644 polyethylene terephthalate glycol copolymer Polymers 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000010104 thermoplastic forming Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/0042—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor without using a mould
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/42—Component parts, details or accessories; Auxiliary operations
- B29C49/48—Moulds
- B29C49/4823—Moulds with incorporated heating or cooling means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/42—Component parts, details or accessories; Auxiliary operations
- B29C49/48—Moulds
- B29C49/4802—Moulds with means for locally compressing part(s) of the parison in the main blowing cavity
- B29C2049/4805—Moulds with means for locally compressing part(s) of the parison in the main blowing cavity by closing the mould halves
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/42—Component parts, details or accessories; Auxiliary operations
- B29C49/58—Blowing means
- B29C2049/5827—Blowing means not touching the preform
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2949/00—Indexing scheme relating to blow-moulding
- B29C2949/07—Preforms or parisons characterised by their configuration
- B29C2949/0715—Preforms or parisons characterised by their configuration the preform having one end closed
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
- B29C49/06—Injection blow-moulding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/08—Biaxial stretching during blow-moulding
- B29C49/10—Biaxial stretching during blow-moulding using mechanical means for prestretching
- B29C49/12—Stretching rods
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/42—Component parts, details or accessories; Auxiliary operations
- B29C49/4273—Auxiliary operations after the blow-moulding operation not otherwise provided for
- B29C49/4283—Deforming the finished article
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/712—Containers; Packaging elements or accessories, Packages
- B29L2031/7158—Bottles
Abstract
The invention relates to a method for forming a container (10C) from a preform (10A) by stretch-blowing, said method comprising: a first step (E1) of positioning the preform (10A) on a fixed support (26); a second step (E2) of freely expanding the preform (10A) by stretch-blowing, the preform (10A) being thereby shaped into an intermediate container (10B) in the form of a bubble; and a third, shaping step (E3) wherein at least one first part (50, 52) of the deformed wall of the preform (10A) comes into contact with at least one moulding surface (44, 46). The invention is characterised in that a second part (54) of the deformed wall of the intermediate container (10B) does not come into contact with any of the moulding surfaces until the final cooling of the container (10C) below the glass transition temperature (Tg) thereof.
Description
Technical field
The present invention relates to a kind of forming method being formed the final container of thermoplastic by preform by stretching-blowing, wherein the main body of preform is heated to and exceedes its glass transition temperature.
The present invention relates more specifically to a kind of forming method utilizing preform to pass through the final container of stretching-blowing formation thermoplastic, and wherein the main body of preform is heated to and exceedes its glass transition temperature, and the method comprises:
-neck of preform is positioned at first step on securing supports;
The second step of-free wxpansion, in the process of this step, extrusion forming fluid is injected in preform to make the bulk deformation of the heat of preform, and in the process of this step, stretching bar is axially incorporated in preform, with by relative to the neck axially separately bottom of preform and axially elongated body, therefore preform is shaped as the intermediate receptacle of air bubble-shaped;
The third step of-shaping, in the process of this step, at least one Part I of the wall portion of the distortion of preform contacts with at least one profile, to give container with its net shape, at least one Part II of the wall portion of the distortion of intermediate receptacle does not contact with any profile, at least until final container is cooled to lower than its glass transition temperature.
Background technology
Known, this kind of shaped device allows the preform based on thermoplastic to form the container of such as bottle.
In description later and claims, container will be called as preform when its original shape, container therebetween shape time will be called as intermediate receptacle, container will be called as final container when its net shape.
The main body of preform is preheated to exceeding its glass transition temperature, has enough ductility to make its wall portion.
The neck of preform has had its final form.With regard to this respect, the material of formation neck is maintained at the temperature lower than its glass transition temperature, in the process of carrying out the method, any distortion occurs to avoid neck.
To be inserted in the die cavity of mould by the preform so heated, the neck of preform rests on the mould upper plate of formation support member.
Die cavity has the profile forming final container die cavity.Profile from the method initial be just positioned at posed positions.Therefore, in the process of whole method, profile keeps fixing relative to support member.
Then, the shaping fluid being generally air is at a first pressure injected in preform by blowing jet pipe, to make the wall portion of preform near the face, chamber of die cavity.
This blowing operation is attended by stretched operation usually, in the process of stretched operation, is inserted in preform by stretching bar, with the ductile wall portion of axially elongated body.
Stretched operation and these two kinds of operations combined of blowing operation allow simultaneously axially and the wall portion that circumferentially stretches.This allows to obtain the final container with the mechanical features adapted with container application.
So preform is shaped as the intermediate receptacle of air bubble-shaped.Along with the lasting injection of blowing fluid, bubble continues to expand, until touch fixing profile.
Now, the blowing fluid be under the second higher pressure is injected in intermediate receptacle, is posted by fixing profile forcefully with the wall portion of the whole distortion making main body.
The wall portion of distortion is made to be cooled to, lower than its glass transition temperature, thus fix the final form of final container with the contact of fixing profile.
Should point-device final container for acquisition size, this method has gratifying result usually.
But this method is very loaded down with trivial details, this is because this method needs to form complicated profile.
In addition, mould is the part being difficult to the heaviness of carrying.
In addition, blow fluid to be injected in preform with high pressure.This causes there is high energy consumption, especially when large batch of container production.Such as, the first injection pressure is about 20 bar, and the second injection pressure is about 40 bar.
Summary of the invention
In order to solve especially the problems referred to above, the present invention proposes a kind of forming method of the above-mentioned type, it is characterized in that, third step comprises initiatively shaping stage, in the process of active shaping stage, at least one profile being called as " movably " profile moves between with upper/lower positions relative to support member:
-holding fix, in this position, movable profile does not contact with the wall portion of the distortion of main body;
-and moulding extreme position, in this position, a part for the wall portion of the distortion of movable profile extruding main body, to reduce the volume of intermediate receptacle.
Further feature according to the method:
-in the process of the active shaping stage of third step, at least two relative profiles are radially moved towards each other simultaneously, to extrude the main body of intermediate receptacle, two profiles are radially separated each other at its moulding extreme position, and the part be extruded of wall portion is not contacted with each other;
-terminating extrusion forming fluid after the injection of container, start initiatively shaping stage;
-third step comprises the passive shaping stage prior to active shaping stage, in the process of passive shaping stage, the injection of the extrusion forming fluid started when second step continues, and in the process of passive shaping stage, a part for the wall portion of the distortion of intermediate receptacle contacts with the profile being called as " fixing " profile, and this fixing profile maintains static relative to support member;
-to be less than the constant pressure injection moulding fluid of 20 bar;
-to be less than 10 bar, especially with the pressure injection moulding fluid of 5 bar;
-when the active shaping stage of third step, control the delivery flow of shaping fluid, with when the mobile end of movable profile, pressure in main body still keeps enough high, to be cooled to lower than keeping the wall portion of being out of shape to recline tightly movable profile in the time needed for glass transition temperature in wall portion, the shape making wall portion retain profile to give;
-when third step, shaping fluid is discharged with the constant flow rate determined.
The invention still further relates to the device of a kind of method that application realizes according to instruction of the present invention, this device comprises:
-for receiving the securing supports of the neck of preform, the blow-moulding means blown into by shaping fluid in the neck of preform;
-can stretch bar in axial sliding;
-at least one radial moveable die with movable profile,
It is characterized in that, each moveable die has the temperature holding member movable profile being remained on determine temperature.
Accompanying drawing explanation
In the process of reading detailed description hereafter, other features and advantages of the present invention will be manifested, in order to understand this description, with reference to the following drawings, in accompanying drawing:
-Fig. 1 shows the perspective view of preform;
-Fig. 2 schematically shows the perspective view of application according to the device of the forming method of instruction of the present invention;
-Fig. 3 shows axial cross-sectional views preform being positioned at the first step in the device of Fig. 2;
-Fig. 4 is the view similar with the view of Fig. 3, shows the second step of stretching-blowing preform;
-Fig. 5 is the view similar with the view of Fig. 3, shows the third step of shaping preform;
-Fig. 6 is the view similar with the view of Fig. 3, shows the 4th step of discharging final container.
Detailed description of the invention
For following description, the part with identical structure or identity function represents with identical Reference numeral.
For following description, adopt following orientation in infinite mode:
-from back to front machine-direction oriented indicated by arrow in figure " L ";
Being vertically oriented from bottom to top of the orientation of-main shaft according to preform indicated by arrow in figure " V ";
-horizontal orientation from left to right indicated by arrow in figure " T ".
Fig. 1 shows the preform 10A be made up of the such as PETG i.e. thermoplastic of " PET ".Preform 10A has the shape that vertical principal axis line is the test tube of " A ".The lower end of preform is closed by domed bottom 12, and the upper end of preform has opening 14, and the tubular neck portions 16 that this opening is " A " by axis radially defines.
The lower end of neck 16 has hoop 18, and the neck 16 being positioned at top separates with the main body 20 being positioned at below comprising bottom 12 by this hoop.
The main body 20 of preform 10A, for by using a kind of forming method to be shaped to the final container 10C shown in Fig. 7, will be described in more detail described forming method hereinafter.
Hereinafter, term " preform 10A ", " intermediate receptacle 10B " and " final container 10C " are according to container shapes in the process of forming method, all relevant to same container.
Neck 16 and the hoop 18 of preform 10A have had its final form.With regard to this respect, when implementing the method, neck and hoop can not deform.
Usually the molding methods by being injected thermoplastic by bottom 12 obtains preform 10A.Bottom 12 has irregular point-like portion in injection phase, and this irregular point-like portion will hereinafter referred to as " decanting point 22 ".
The material forming the main body 20 of the preform 10A so obtained, neck 16 and hoop 18 has the state being called as " amorphous " state, and under " amorphous " state, material is hard.To be called as the temperature " Tg " of " gamma transition " temperature to exceeding by being somebody's turn to do " amorphous " heating materials, material transition is to " glass " state, and under " glass " state, material has allow it to stretch soft and the quality of thickness.
Known enforcement the method before prepare preform 10A like this: main body 20 is heated to above its glass transition temperature " Tg ", and the temperature that neck 16 and hoop 18 are remained on lower than its glass transition temperature " Tg " deforms to avoid them.
Fig. 2 shows device 24, and this device is formed the forming method of final container 10C by preform 10A for applying.
Device 24 has support member 26, and this support member is hereinafter with the object of reference fixed.Support member 26 is for receiving the neck 16 of preform 10A.Preform 10A is shown in broken lines.
More specifically, in embodiment shown in the figure, support member 26 is the level boards with circular port 28, inserts the main body 20 of preform 10A in circular port.The diameter in hole 28 is less than the overall diameter of hoop 18, hoop 18 is resisted against on the upper surface of support member 26, and the main body 20 of preform freely extends in the below of support member 26.
Support member 26 is divided into two parts that can separate transverse to each other.Hole 28 is divided into equal two halves by the jointing line between these two parts.This allows to ensure at the end of the method, discharge final container 10C, because when described two parts are assembled together, the net shape of main body 20 does not allow it to pass hole 28.
As modification, support member keeps parts that are fixing, that simultaneously the subject freedom of preform is extended to be formed by fixture or other any necks that can make during implementing the method.
Device 24 also has the blow-moulding means 30 blown into by extrusion forming fluid in the neck 16 of preform 10A.
Therefore, blow-moulding means 30 is equipped with jet pipe 32, and this jet pipe has leading portion 34, this leading portion when preform is in place on support member 26 and the axis " A " of preform 10A arrange coaxially.Jet pipe 32 can be installed slidably in ceasing between the blowing bottom shown in upper and Fig. 3 shown in Fig. 2, wherein ceases upper for allowing location or the taking-up of preform 10A, and the next in blowing, and the leading portion 34 of jet pipe 32 is connected hermetically with the opening 14 of neck 16.
Here, leading portion 34 has the shape of bell-jar, for coated neck 16.The lower edge of bell-jar is used for reclining hermetically the upper surface of support member 26.
As modification, leading portion is used for being inserted into hermetically in neck as stopper.
Jet pipe 32 is connected with controlled source of pressurised fluid 36.Pressure fluid is such as formed by the compressed air of 5 bar.
Vertical stretching bar 38 can vertically be slidably mounted in jet pipe 34, and coaxial with the axis " A " of preform 10A when preform is positioned on support member 26.Stretching bar 38 has lower end 40 freely, and as illustrating in greater detail hereinafter, this lower end is used for being inserted in preform 10A by neck 16.Therefore, the slip of stretching bar 38 is controlled in and regains between upper and ultimate extension bottom.
The controlled part that stretching bar 38 is moved is known, is therefore no longer described.This controlled part is such as piston or linear electric machine.
Device 24 has the movable mould 42 of two transverse directions in addition, these two moulds be installed in support member 26 below, on the height of main body 20 being positioned at the preform 10A on support member 26.Each mould is with movable profile 44, and movable profile extends substantially in vertical fore-and-aft plane.Movable profile 44 is arranged in the both sides of axis " A " laterally toward each other.
Mould 42 is controlled in laterally translation between upper/lower positions:
-holding fix, in this position, two moulds are separated from each other;
-and moulding extreme position, in this position, two moulds are close transverse to each other, but remain with lateral clearance between two profiles 44, and any one making in mould does not contact with the stretching bar 38 being positioned at stretch position.
Such as, control mould 42 by piston and move, wherein, a piston push rod is only shown in figure.
As modification, piston is replaced by linear electric machine.
Device 24 also has profile 46, this profile be disposed in support member 26 below, on the axis in hole 28.Here, profile 46 has the shape of vertical rib.This profile by triangular prism cylindricality voussoir 48 with, the axis of this voussoir longitudinally extends.
Voussoir 48 can the upper and translation vertically between the next (not shown) that ceases in the use such as shown in Fig. 3.This especially allows to contribute at the end of forming method by separately voussoir 48 and final container 10C discharge final container 10C.
As what be described further below, voussoir 48 for being positioned at its use location during the forming step of forming method.With regard to this respect, by voussoir 48 with profile 46 hereafter with in claims will be called as fixing profile 46, this is because be the wall portion of the distortion of intermediate receptacle 10B for mobile to contact with fixing profile 46.
Now, with reference to Fig. 3 to Fig. 6, be described through stretching-blowing and utilize preform 10A to form the forming method of the final container 10C of thermoplastic.This forming method is implemented by device 24 mentioned above.
As already explained, before the first step of forming method, the main body 20 of preform 10A has been heated to and has exceeded its glass transition temperature " Tg ", and the temperature of neck keeps being less than described glass transition temperature " Tg ".
Fig. 3 shows the first step " E1 " of locating by the preform 10A so heated.When this step is initial, jet pipe 32 and voussoir 48 is each is positioned at its rest position, and mould 42 is positioned at its holding fix.Therefore, the hole 28 of support member 26 can enter, in order to receive preform 10A.Two parts of support member 26 are separated, and in order to receive preform 10A, then two parts are closed.
Then, as shown in Figure 3, jet pipe 32 declines towards its blowing is the next, and voussoir rises on its use location.
As shown in Figure 4, at the end of first step " E1 ", start the second step " E2 " making main body 20 free wxpansion of preform 10A.
So when blowing operation, extrusion forming fluid is injected in preform 10A by jet pipe 32 with constant pressure.Thus pressure in the main body 20 of preform 10A become the pressure be greater than outside main body 20.Because the material of the wall portion forming main body 20 is in " glass " state, thus pressure reduction causes main body 20 to be expanded by the distortion of its wall portion, and thus main body is drawn into air bubble-shaped.Neck 16 and the hoop 18 of preform 10A remain hard, and this allows to make them to remain on fixed position on support member 26.
In the process of whole blowing operation, shaping fluid, to be less than 20 bar, to be more advantageously injected into the pressure being less than 10 bar, is especially injected into the pressure of 5 bar.
In embodiment shown in the figure, in the process of whole blowing operation, the pressure of shaping fluid is constant.
As unshowned modification of the present invention, the pressure time to time change of blowing fluid, to improve shaping repeatability.
With blowing operation side by side, preform 10A also bears stretched operation.In the process of this stretched operation, stretching bar 38 is axially introduced in preform 10A by the neck 16 of preform, with by relative to keeping fixing neck 16 axially to promote the bottom 12 of preform 10A and axially elongated body downwards.This allows to stretch vertically and forms the material of wall portion, especially at the material being arranged in hoop 18 region immediately below.
Therefore, the stretching that this stretched operation simultaneously carried out with blowing operation allows being called as of the wall portion of realization body 20 " two-way " to stretch.
Preform 10A is now shaped to intermediate receptacle 10B, and wherein, the main body 20 of intermediate receptacle forms bubble.
As long as the outer surface of the wall portion of the main body 20 of intermediate receptacle 10B does not contact with any profile, the second step " E2 " of this free wxpansion just continues to carry out.Therefore, in the process of the second step " E2 " of whole expansion, the wall portion of main body 20 is freely out of shape, and is not namely out of shape contiguously with profile.
At the end of second step " E2 ", thus preform 10A is shaped to the intermediate receptacle 10B of air bubble-shaped as shown in Figure 4.
Be understandable that, the beginning of stretched operation can slightly prior to or slightly after in blowing operation, importantly, these two operation part overlaps, stretch while both direction to realize material.
So start the third step " E3 " be shaped.In the process of third step " E3 ", at least one Part I 50,52 of the wall portion of the distortion of main body 20 contacts with at least one profile 44,46, to give container 10C with its net shape.
When third step " E3 " also until the end of the method, at least one Part II 54 of the wall portion of the distortion of the main body 20 of intermediate receptacle 10B does not contact with any profile, until final container 10C is cooled to lower than its glass transition temperature " Tg ".
Here, third step " E3 " resolves into the second stage " E3-2 " that first stage " E3-1 " of passive shaping as shown in Figure 5 and active are as shown in Figure 6 shaped.
When first stage " E3-1 " of passive shaping, blowing operation continues to carry out, and continues to expand to make main body 20.At this moment the lower part 50 of the bottom of the deformable wall portion of intermediate receptacle 10B contacts with fixing profile 46.In second step " E2 " and third step " E3 " period, fixing profile 46 maintains static relative to support member 26, as indicated by the arrows in fig. 5, is that the wall portion expanded moves and contacts fixing profile 46.
The part 50 of bottom corresponds to the bottom 12 of preform 10A, and therefore this part has decanting point 22.The part 50 of bottom contacts with fixing profile 46, and the remainder of main body 20 continues its free wxpansion in voussoir 48 both sides.The part 50 touching fixing profile 46 of bottom is cooled to lower than its glass transition temperature " Tg ", therefore secures the above the type trace shape of fixing profile 46.
Therefore, the existence of voussoir 48 allows between the part 50 and neck 16 of the bottom of final container 10C, obtain accurate vertically size.Therefore, all container 10C produced by the method have substantially identical vertical size.
At the end of the first stage " E3-1 ", blowing operation terminates and the second stage " E3-2 " be initiatively shaped starts immediately.In other words, after the injection of container 10B, initiatively shaping stage " E3-2 " is started at end extrusion forming fluid.
As shown in Figure 5, at the initial stage of the second stage " E3-2 " be initiatively shaped, mould 42 is positioned at its holding fix all the time, and at this holding fix, movable profile 44 does not contact with the wall portion of the distortion of main body 20.
Mould 42 is controlled simultaneously and moves towards its moulding extreme position, and in this position, movable profile 44 laterally extrudes the wall portion of the distortion of main body 20, to reduce the volume of bubble.Therefore, movable profile 44 contacts with the relative side direction part 52 of the wall portion of the distortion of main body 20.
At the moulding extreme position of movable profile, the lateral clearance retained between two movable profiles 44 allows the relative side direction part 52 be extruded avoiding wall portion to contact with each other.
The movement of mould 42 is enough fast, makes the material forming side direction part 52 be stretched and not be torn.
After blowing operation terminates, the extrusion forming fluid be included in container 10B is discharged with the flow determined, this flow is such as controlled by dump valve (not shown).Shaping fluid is discharged through jet pipe 32.
The delivery flow of shaping fluid is controlled such that the pressure in main body keeps enough high, to keep the wall portion of being out of shape to recline tightly profile within the required time, makes wall portion retain the shape of being given by profile.In other words, the pressure in preform declines lentamente, even increases to some extent before decreasing, with the type trace allowing the part 50,52 contacted with profile 44,46 of wall portion to firmly fix profile.Therefore, be cooled to lower than in the time needed for glass transition temperature " Tg " in wall portion, keep the part 50,52 of wall portion to recline profile 44,46.
Here, such as, by valve or by path constriction, delivery flow is fixed as a steady state value, makes this flow when main body 20 is extruded between two moulds 42 be less than the pace of change of container volume.
The side direction part 52 of main body 20 causes described side direction part 52 to be cooled to lower than glass transition temperature " Tg " with the contact of movable profile 44.
At least one Part II 54 being called as " freedom " part of the wall portion of the distortion of final container 10C does not contact with any profile, at least until the temperature of main body drops to lower than its glass transition temperature " Tg ".Here, Part II 54 never contacts with profile freely.
Therefore final container is as shown in Figure 7 formed.This final container has two flat sides 52, and these flat sides correspond to the side direction part 52 contacted with the movable profile 44 of mould.The lower bottom part 50 of final container has the shape of epirelief fold, and wherein the seamed edge of fold corresponds to the part 50 contacted with fixing profile 46 of bottom.In the process of carrying out the method, by the existence of voussoir 48, the vertical size between bottom 50 and neck 16 is manipulated.
Container corresponding to keeping the vertical sidepiece 54 of Part II 54 freely to be linked together to each other two sides 52.These sidepieces 54 are parts do not contacted with profile of wall portion.When final container 10C is cooled to lower than its glass transition temperature " Tg ", form the Material shrinkage of these sidepieces 54, to form the fold similar with the fold of the bottom 50 of final container 10C.
The thermoplastic forming final container 10C has enough elasticity, and to allow the fold of sidepiece 54 and bottom 50 to form folded part, folded part can allow two sides 52 relative to each other apart transversely when container 10C is full of liquid.
Therefore, this container 10C forms soft bag, and wherein the neck 16 of soft bag is one-body molded with main body 20.This soft bag, for receiving the product of fluid product or thickness, makes these sides be pressed against each other by extrusion side 52 and can discharge described product.Advantageously, neck 16 is threaded, and this screw thread allows, with stopper (not shown) covered container 10C, therefore to allow to close this container.
Therefore, allow to form container 10C in very easy mode according to the described method that instruction of the present invention is carried out, this is because of no need of arranging the mould of the complete die cavity with final container 10C.
In addition, with by blow is formed container usual needed for pressure compared with, shaping fluid is injected in preform 10A with extremely low pressure.
As unshowned modification of the present invention, each movable mould 42 has makes movable profile 44 remain on the temperature holding member determining temperature.This temperature holding member is such as the closed circuit of heat transport fluid.Voussoir 48 also can be equipped with similar temperature holding member.Therefore, described temperature holding member allows to make profile 44,48 remain on the temperature being suitable for container formation, particularly when container is formed with high-frequency batch.
In addition, the method allows to obtain soft bag-shaped container, and this container forms single component together with its neck.
Be understandable that, the method may be used for being formed the container with the shape being different from sack.Therefore, the method can use the movable profile more than two, and these movable profiles are not necessarily arranged to toward each other.
In addition, compared with known forming method, the method allows to save material.In fact, must be hard according to the conventional container that the method for prior art is formed, therefore container has relatively thick wall portion.The soft bag obtained by method according to the present invention can be formed with the wall portion thinner than the wall portion of conventional container, and this allows to save a considerable amount of material.
Claims (9)
1. one kind forms the method for the final container (10C) of thermoplastic by preform (10A) by stretching-blowing, the main body (20) of preform is heated to and exceedes its glass transition temperature (Tg), and described method comprises:
-neck (16) of preform (10A) is positioned at first step (E1) on securing supports (26);
The second step (E2) of-free wxpansion, in the process of second step, extrusion forming fluid is injected in preform (10A) to make the main body (20) of the heat of preform be out of shape, and in the process of second step, stretching bar (38) is axially incorporated in preform (10A), with by relative to neck (16) the axially separately bottom (12) of preform (10A) and axially elongated body (20), therefore preform (10A) is shaped to the intermediate receptacle (10B) of air bubble-shaped;
The third step (E3) of-shaping, in the process of third step, at least one Part I (50,52) of the wall portion of the distortion of preform (10A) contacts with at least one profile (44,46), to give final container (10C) with net shape, at least one Part II (54) of the wall portion of the distortion of intermediate receptacle (10B) does not contact with any profile, at least until final container (10C) is cooled to lower than its glass transition temperature (Tg)
It is characterized in that, third step (E3) comprises initiatively shaping stage (E3-2), in the process of active shaping stage, at least one profile (44) being called as " movably " profile moves between with upper/lower positions relative to securing supports (26):
-holding fix, at holding fix, movable profile does not contact with the wall portion of the distortion of main body (20);
-and moulding extreme position, at moulding extreme position, a part (52) for the wall portion of the distortion of movable profile extruding main body (20), to reduce the volume of intermediate receptacle (10B).
2. method according to claim 1, it is characterized in that, in the process of the active shaping stage (E3-2) of third step (E3), at least two relative movable profiles (44) are radially moved towards each other simultaneously, to extrude the main body (20) of intermediate receptacle (10B), two movable profiles (44) are radially separated each other at its moulding extreme position, and the part (52) be extruded of wall portion is not contacted with each other.
3. the method according to any one of the claims, is characterized in that, after extrusion forming fluid terminates to the injection of intermediate receptacle (10B), starts initiatively shaping stage (E3-2).
4. the method according to any one of the claims, it is characterized in that, third step (E3) comprises the passive shaping stage (E3-1) prior to active shaping stage (E3-2), in the process of passive shaping stage, the injection of the extrusion forming fluid started when second step (E2) continues, and in the process of passive shaping stage, a part (50) for the wall portion of the distortion of intermediate receptacle (10B) contacts with the profile (46) being called as " fixing " profile fixed relative to securing supports (26).
5. the method according to any one of the claims, is characterized in that, injects extrusion forming fluid with the constant pressure being less than 20 bar.
6. method according to claim 5, is characterized in that, to be less than 10 bar, especially to inject extrusion forming fluid with the pressure of 5 bar.
7. the method according to any one of the claims, it is characterized in that, when active shaping stage (E3-2) of third step (E3), control the delivery flow of extrusion forming fluid, make when the mobile end of movable profile (44), pressure in main body still keeps enough high, to be cooled in wall portion, lower than keeping the wall portion of distortion to be close to by movable profile (44) in the time needed for glass transition temperature (Tg), make wall portion retain the shape of being given by profile.
8. method according to claim 7, is characterized in that, when third step, extrusion forming fluid is discharged with the constant flow rate determined.
9. the device (24) of the method for an application according to any one of the claims, described device (24) comprising:
-for receiving the securing supports (26) of the neck (16) of preform (10A), the blow-moulding means (32) blown into by extrusion forming fluid in the neck (16) of preform (10A);
-can stretch bar (38) in axial sliding;
-at least one movable mould of radial direction (42) with movable profile (44),
It is characterized in that, the movable mould of each radial direction (42) has movable profile (44) is remained on the temperature holding member determining temperature.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1260018 | 2012-10-22 | ||
| FR1260018A FR2997033B1 (en) | 2012-10-22 | 2012-10-22 | "PROCESS FOR FORMING A STRETCH-BLOWING CONTAINER IN WHICH A PART OF THE WALL OF THE CONTAINER IS NOT MOLDED" |
| PCT/EP2013/071953 WO2014064041A1 (en) | 2012-10-22 | 2013-10-21 | Method for forming a container by stretch-blowing wherein part of the wall of the container is not moulded |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104736320A true CN104736320A (en) | 2015-06-24 |
| CN104736320B CN104736320B (en) | 2017-05-03 |
Family
ID=47356216
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201380055086.1A Expired - Fee Related CN104736320B (en) | 2012-10-22 | 2013-10-21 | Method for forming a container by stretch-blowing wherein part of the wall of the container is not moulded |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP2909001A1 (en) |
| CN (1) | CN104736320B (en) |
| FR (1) | FR2997033B1 (en) |
| WO (1) | WO2014064041A1 (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5122327A (en) * | 1991-04-18 | 1992-06-16 | Hoover Universal, Inc. | Blow molding method for making a reversely oriented hot fill container |
| CN1129637A (en) * | 1994-09-26 | 1996-08-28 | 株式会社青木固研究所 | Composite molding device applied for stretch blow molding |
| JPH08244747A (en) * | 1995-03-03 | 1996-09-24 | Sunstar Inc | Plastic bottle |
| CN1195610A (en) * | 1997-04-08 | 1998-10-14 | 鲍尔公司 | Method and apparatus for producing stretch blow molded articles |
| EP1897671A1 (en) * | 2006-09-07 | 2008-03-12 | Corelco | Guiding block with integrated cooling |
| CN100513136C (en) * | 2004-05-19 | 2009-07-15 | 日精Asb机械株式会社 | Stretch blow molding method for grippable bottle |
| WO2011115178A1 (en) * | 2010-03-17 | 2011-09-22 | ダイハツ工業株式会社 | Resin fuel tank |
| CN102271895A (en) * | 2008-11-19 | 2011-12-07 | 西德尔合作公司 | Mould for blowing vessels with reinforced bottom |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011006168A1 (en) * | 2009-07-10 | 2011-01-13 | Pressco Technology, Inc. | Method and system for moldless bottle manufacturing |
-
2012
- 2012-10-22 FR FR1260018A patent/FR2997033B1/en not_active Expired - Fee Related
-
2013
- 2013-10-21 EP EP13783293.7A patent/EP2909001A1/en not_active Withdrawn
- 2013-10-21 CN CN201380055086.1A patent/CN104736320B/en not_active Expired - Fee Related
- 2013-10-21 WO PCT/EP2013/071953 patent/WO2014064041A1/en active Application Filing
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5122327A (en) * | 1991-04-18 | 1992-06-16 | Hoover Universal, Inc. | Blow molding method for making a reversely oriented hot fill container |
| CN1129637A (en) * | 1994-09-26 | 1996-08-28 | 株式会社青木固研究所 | Composite molding device applied for stretch blow molding |
| JPH08244747A (en) * | 1995-03-03 | 1996-09-24 | Sunstar Inc | Plastic bottle |
| CN1195610A (en) * | 1997-04-08 | 1998-10-14 | 鲍尔公司 | Method and apparatus for producing stretch blow molded articles |
| CN100513136C (en) * | 2004-05-19 | 2009-07-15 | 日精Asb机械株式会社 | Stretch blow molding method for grippable bottle |
| EP1897671A1 (en) * | 2006-09-07 | 2008-03-12 | Corelco | Guiding block with integrated cooling |
| CN102271895A (en) * | 2008-11-19 | 2011-12-07 | 西德尔合作公司 | Mould for blowing vessels with reinforced bottom |
| WO2011115178A1 (en) * | 2010-03-17 | 2011-09-22 | ダイハツ工業株式会社 | Resin fuel tank |
Also Published As
| Publication number | Publication date |
|---|---|
| EP2909001A1 (en) | 2015-08-26 |
| FR2997033A1 (en) | 2014-04-25 |
| FR2997033B1 (en) | 2015-03-27 |
| CN104736320B (en) | 2017-05-03 |
| WO2014064041A1 (en) | 2014-05-01 |
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