WO1999022926A1 - Verfahren zur herstellung von mehrschichtigen vorformlingen - Google Patents
Verfahren zur herstellung von mehrschichtigen vorformlingen Download PDFInfo
- Publication number
- WO1999022926A1 WO1999022926A1 PCT/CH1998/000471 CH9800471W WO9922926A1 WO 1999022926 A1 WO1999022926 A1 WO 1999022926A1 CH 9800471 W CH9800471 W CH 9800471W WO 9922926 A1 WO9922926 A1 WO 9922926A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- component
- nozzle chamber
- needle
- cycle step
- preform
- Prior art date
Links
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 17
- 230000004888 barrier function Effects 0.000 claims abstract description 40
- 239000004033 plastic Substances 0.000 claims abstract description 15
- 229920003023 plastic Polymers 0.000 claims abstract description 15
- 238000001746 injection moulding Methods 0.000 claims abstract description 9
- 239000000463 material Substances 0.000 claims description 98
- 238000000034 method Methods 0.000 claims description 30
- 238000002347 injection Methods 0.000 claims description 16
- 239000007924 injection Substances 0.000 claims description 16
- 238000000465 moulding Methods 0.000 claims description 8
- 239000004677 Nylon Substances 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 5
- 229920001778 nylon Polymers 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 2
- 239000010410 layer Substances 0.000 abstract description 43
- 239000002344 surface layer Substances 0.000 abstract 2
- 235000013361 beverage Nutrition 0.000 description 7
- 239000000945 filler Substances 0.000 description 7
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 239000012876 carrier material Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000011017 operating method Methods 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 239000008187 granular material Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- 241000251730 Chondrichthyes Species 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000000071 blow moulding Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000010408 film Substances 0.000 description 1
- 238000003197 gene knockdown Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 229920003207 poly(ethylene-2,6-naphthalate) Polymers 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000011112 polyethylene naphthalate Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
- 239000010409 thin film Substances 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/16—Making multilayered or multicoloured articles
- B29C45/1642—Making multilayered or multicoloured articles having a "sandwich" structure
- B29C45/1646—Injecting parison-like articles
-
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/16—Making multilayered or multicoloured articles
- B29C45/1603—Multi-way nozzles specially adapted therefor
-
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/16—Making multilayered or multicoloured articles
- B29C45/1642—Making multilayered or multicoloured articles having a "sandwich" structure
- B29C45/1643—Making multilayered or multicoloured articles having a "sandwich" structure from at least three different materials or with at least four layers
-
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/16—Making multilayered or multicoloured articles
- B29C45/1642—Making multilayered or multicoloured articles having a "sandwich" structure
- B29C45/1646—Injecting parison-like articles
- B29C2045/1648—Injecting parison-like articles the parison core layer being a barrier material
-
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/16—Making multilayered or multicoloured articles
- B29C45/1642—Making multilayered or multicoloured articles having a "sandwich" structure
- B29C2045/1656—Injecting the skin material through the central passage of the multiway nozzle
-
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/27—Sprue channels ; Runner channels or runner nozzles
- B29C45/28—Closure devices therefor
- B29C45/2806—Closure devices therefor consisting of needle valve systems
- B29C2045/2872—Closure devices therefor consisting of needle valve systems with at least three positions, e.g. two different open positions to control the melt flow
-
- 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
- B29C2949/081—Specified dimensions, e.g. values or ranges
- B29C2949/0811—Wall thickness
- B29C2949/0819—Wall thickness of a layer
-
- 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
- B29C2949/0861—Other specified values, e.g. values or ranges
- B29C2949/0872—Weight
-
- 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
- B29C2949/30—Preforms or parisons made of several components
- B29C2949/3008—Preforms or parisons made of several components at neck portion
- B29C2949/3009—Preforms or parisons made of several components at neck portion partially
-
- 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
- B29C2949/30—Preforms or parisons made of several components
- B29C2949/3012—Preforms or parisons made of several components at flange portion
-
- 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
- B29C2949/30—Preforms or parisons made of several components
- B29C2949/3016—Preforms or parisons made of several components at body portion
-
- 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
- B29C2949/30—Preforms or parisons made of several components
- B29C2949/302—Preforms or parisons made of several components at bottom portion
-
- 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
- B29C2949/30—Preforms or parisons made of several components
- B29C2949/3024—Preforms or parisons made of several components characterised by the number of components or by the manufacturing technique
- B29C2949/3026—Preforms or parisons made of several components characterised by the number of components or by the manufacturing technique having two or more components
- B29C2949/3028—Preforms or parisons made of several components characterised by the number of components or by the manufacturing technique having two or more components having three or more components
-
- 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
- B29C2949/30—Preforms or parisons made of several components
- B29C2949/3024—Preforms or parisons made of several components characterised by the number of components or by the manufacturing technique
- B29C2949/3026—Preforms or parisons made of several components characterised by the number of components or by the manufacturing technique having two or more components
- B29C2949/3028—Preforms or parisons made of several components characterised by the number of components or by the manufacturing technique having two or more components having three or more components
- B29C2949/303—Preforms or parisons made of several components characterised by the number of components or by the manufacturing technique having two or more components having three or more components having more than three components
-
- 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
- B29C2949/30—Preforms or parisons made of several components
- B29C2949/3032—Preforms or parisons made of several components having components being injected
- B29C2949/3034—Preforms or parisons made of several components having components being injected having two or more components being injected
- B29C2949/3036—Preforms or parisons made of several components having components being injected having two or more components being injected having three or more components being injected
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/25—Solid
- B29K2105/253—Preform
Definitions
- the present invention relates to a method
- the present invention relates to a method which is suitable for producing three-layer preforms with an increased recyclate content and enables preforms to be produced with an improved oxygen diffusion barrier behavior.
- Multi-layer preforms have been known for a long time and are used inter alia. in the beverage industry, which uses these preforms to manufacture plastic bottles on site into which the respective drinks are filled. These beverage bottles are preferably made of PET, although they are also made of other thermoplastics
- New materials at Vorfor only have a partial impact with recycled PET. This makes it easier to calculate the costs for manufacturers and bottlers.
- the resulting technical task is therefore to be able to produce preforms with extremely thin layers of new material and without complex constructions in order to be able to increase the proportion of recycled material in these preforms.
- three-layer preforms should be created in a simple manner, which at least one layer as thin as possible, respectively. have a recyclate content of more than 35% by volume, in particular 35 to 65% by volume.
- This object is achieved according to claim 1 by a surprisingly simple method for operating a multi-component injection molding tool and in particular in that the supply of components A and B is reversed in contrast to the conventional arrangements and the molding tool is operated in such a way that in a first cycle Step the locking needle is brought into a position in which both the inner nozzle chamber and the outer nozzle chamber are open, the conveyance of the B component by the outer nozzle chamber being stopped and only the A component by the inner nozzle chamber in the mold cavity is injected.
- component A new material to be injected as the first component is passed through the inner nozzle chamber to form a thin skin layer
- component B recycled material
- component klat further component klat
- valve pin In a second cycle step, the valve pin is brought into a position II, in which the inner nozzle chamber is closed and the outer nozzle chamber is open. At this needle position, the delivery of the A component is interrupted and the B component is injected into the mold cavity.
- the so-called holding phase in which the B component shrinking due to cooling is supplemented, the position of the closure needle remains unchanged.
- the valve pin At the end of the holding phase, the valve pin is brought into its closed position III, in which both the inner and the outer nozzle chamber are closed.
- preforms with a thinner skin layer can be formed with the method according to the invention, and the relative proportion of filler material can be increased by refilling the mold cavity with material of the B component during the shark pressure phase.
- the method according to the invention also allows preforms to be produced with an extremely thin barrier layer (for example made of nylon or the like). These barrier layers have the task of minimizing the oxygen permeability of the molded articles (bottles) and are relatively expensive.
- the supply channels are in turn exchanged contrary to the conventional arrangements and the barrier material to be injected to form the thin barrier layer is passed through the innermost nozzle chamber and the plastic forming the skin layer is passed through an outer nozzle chamber.
- the shut-off needle is again brought into a position I in a first cycle step, in which both the outer and the inner nozzle chamber are open, and in a first process step the component guided through the outer nozzle chamber is inserted into the Injection molded cavity, while at the same time the delivery of the barrier material passed through the inner nozzle chamber is interrupted.
- the shut-off needle remains in this position I and the barrier material conveyed through the inner nozzle chamber is simultaneous with that through the outer resp. middle filling chamber led filling material introduced into the mold cavity.
- both components filling and barrier material
- both components are conveyed simultaneously, i.e. in the form of hoses lying one inside the other, whereby care is taken to ensure that the proportion of barrier material conveyed remains extremely low, for example, 5% of the total amount of material injected.
- the filling material and the material forming the skin layer can be identical. However, inexpensive recyclate is preferably used as the filling material. This is achieved in a known and simple manner by controlling the supply of the plasticized plastics.
- a third cycle step the conveyance of the barrier material is stopped again and the filled mold is cavity filled with the amount of filler material required to compensate for the shrinkage.
- both nozzle chambers are closed and the injection cycle is ended.
- the thin barrier layer lies in the central wall area of the preform. It shows that preforms resp. Moldings with such a layer arrangement have the required barrier behavior against the oxygen diffusing into these containers.
- the preforms produced by the operating method according to the invention have a recyclate content of more than 35% by volume and possibly a barrier layer content of less than 5% by volume.
- Figure 1 a cross section through a hot runner nozzle and its needle valve
- Figures 2a to 2d the positions and control of the needle valve assembly
- Figure 3 longitudinal section through a preform produced in a conventional manner
- Figure 4 Longitudinal section through a preform produced according to the invention with a high recyclate content.
- Figure 5 Longitudinal section through a preform produced according to the invention with a barrier layer.
- Figure 1 shows a section of the structure of a co-injection mold with a hot runner nozzle 34 and a needle valve 36 for two different components A and B.
- the material plasticized in the extruders reaches the hot runner distributor block 15 through separate channels, is branched therein and fed to the individual hot runner nozzles 34.
- Each of these hot runner nozzles 34 has a removable nozzle holder 33 and is constructed from a plurality of nozzle inserts lying one inside the other, between which an inner nozzle chamber 3 and at least one outer nozzle chamber 5 are formed, in which the various plastic components are conveyed to the nozzle tip. Heating elements hold both the hot runner
- a pneumatically controlled needle valve 36 controls a movable needle 37 in the nozzle tip area of the hot runner nozzle 34 for releasing or. to shut off the individual components A resp. B and / or C.
- the closure needle 37 is brought into four positions during a spraying cycle in order to fill a cavity, for example, in three layers.
- a first position the needle 37 is only retracted to such an extent that the cavity has a first component, in particular with original PET or. Raw material that can be filled.
- a second position the needle 37 is withdrawn further, so that the second component, for example recycled PET, can also be pressed into the mold cavity through the inner nozzle chamber 3 before the needle 37 returns to the first position for the holding phase and then completely afterwards is pushed in front to close the nozzle 34.
- the shut-off needle must therefore be brought into four predetermined positions: a) opening the outer nozzle chamber 5, b) opening the inner nozzle chamber 3, c) closing the inner nozzle chamber 3, d) closing the outer nozzle chamber 3.
- the needle lock 36 is in a recess acting as a pneumatic cylinder in FIG the top plate 13 logs and consists of a first piston 38 guiding the needle 37, over which a second piston 39 is movably inserted.
- a hermetically sealing cylinder cover 40 closes off this recess in a pressure-tight manner.
- Suitably arranged pressure lines 41, 43 and 44 allow the individual pistons and thus the needle 37 to be brought into the desired position.
- the individual pressure lines each have a pressure required for the movement of the needle.
- the outer pressure line 44 is usually pressurized with 20 bar, the middle pressure line 43 with 10 bar and the inner pressure line 41 with 5 bar.
- the outer pressure line 44 is initially pressurized again and the two pistons 38, 39 are thus moved together in the closing direction. Only when the middle pressure line 43 is again under pressure can the outer nozzle chamber be interrupted again by the movement of the first piston 38.
- Pressure-proof seals 51, 52 are provided on the individual for the pneumatic needle lock arrangement 36 to work properly
- Pistons and seals 53 are provided on the cylinder cover 40.
- a gas-tight axial seal 55 made of temperature-resistant plastic.
- multi-layer preforms with an increased recyclate content or.
- the supply of components A and B is exchanged contrary to the conventional arrangements and operated in such a way that component A with the material to be introduced only in a thin layer (new material or barrier material) in the inner nozzle chamber 3 of the hot - Channel nozzle 34 is promoted, while component B with the recyclate to be introduced in the outer resp. middle nozzle chamber 5 of the hot runner nozzle 34 is promoted.
- a molding with a thin outer skin is to be produced from new material and a thin barrier layer
- the new material is conveyed in the outermost of three nozzle chambers and the barrier layer material in the innermost nozzle chamber, in such a way that the barrier layer material can be injected simultaneously with the filling material from the middle nozzle chamber .
- a first portion of the carrier material is injected into the mold cavity through the outer of two nozzle chambers in a first step and the carrier material and the barrier material are simultaneously processed in a second step. ie in the form of hoses lying one inside the other, injected into the mold cavity.
- the needle 37 will brought into positions, as will be explained in more detail below with reference to FIGS. 2a to 2d.
- FIGS. 2a to 2d show partial sections of the hot runner nozzle 34 with the associated needle valve 36.
- the needle 37 is withdrawn to the extent that this inner nozzle chamber 3 is released, as shown in FIG. 2a .
- the required amount of original material A can be introduced into the mold cavity. Since this original material A in the interior of the hot runner nozzle 34 has a lower viscosity than the filling material B in the outer nozzle chamber 5, it is sufficient to introduce only a small proportion of original material A into the mold cavity.
- This needle position I can be achieved in that the pressure in the pressure lines 44 and 43, above the second piston 39 and.
- both pistons are in their highest possible position and the needle 37 can thereby release the inner nozzle chamber 3.
- the needle 37 is brought into a position II, in which the inner nozzle chamber 3 is closed, but the outer nozzle chamber 5 remains open. This is achieved by maintaining the pressure of, for example, 6 bar in the pressure line 41 and increasing the pressure in the pressure line 44 above the second piston 39 to somewhat more, for example 10 bar. In this position, component B (filling material) is passed through the outer nozzle chamber 5 into the
- This material has a higher viscosity than that from the inner nozzle chamber 3 and therefore displaces the previously injected component A in a thin film onto the outer surfaces of the mold cavity without tearing this film. This difference in viscosity allows preforms with a thin outer skin to be produced.
- the filled mold cavity is kept under pressure for a time, ie during the so-called holding phase with the filler material B, in order to compensate for the loss of volume of the material which occurs due to shrinkage processes.
- Figure 2c shows the hot runner nozzle 34 and its needle valve 36 in a position III, in which both the inner nozzle chamber 3 and the outer nozzle chamber 5 are closed. This is achieved in that the pressure in the pressure line 41 below the first piston 38 is reduced to, for example, 0 bar and at the same time the pressure in the pressure line 43 between the two pistons is increased to, for example, 6 bar, while the pressure in the pressure line 44 above the second piston 39 is maintained at 10 bar, for example.
- the injection cycle is started with a needle position as shown in FIG. 2b in order to introduce component A (new material) into the mold cavity.
- the closure needle 37 is then brought into position I in order to fill up the mold cavity with component B (filler material).
- the needle is brought back into position II in accordance with FIG. 2d in order to supplement the material which has shrunk due to the cooling with the A component and thus to ensure that no B component (recycled material) is used as the first material for the next injection cycle Cavity.
- the needle is moved to position III as shown in FIG. 2c.
- the injection cycle is ended by refilling the shrinked filler material with the same component, while conventionally the shrinked material volume is replaced with the component that is to be injected as the first component in the next injection cycle.
- B component recycled material
- FIGS. 3 and 4 make the difference between the method according to the invention and the conventional method clear.
- 3 shows one
- FIG. 4 shows a longitudinal section through a preform produced according to the invention.
- This differs essentially in the structure of the floor partly 64, which only has three layers, namely an inner skin, filler material and an outer skin. There is also a significant difference in the thickness of the individual layers.
- Conventional preforms with a weight of 48.0 g and a total wall thickness of 4.37 mm, which are suitable for 1.5 liter bottles, have an outer skin with a thickness of 1.3 to 1.5 mm. This results in a volume fraction for the internal filling material B of 25 to 33% by volume.
- the outer material 65, 66 has a thickness of 1.2 to 0.6 mm and the percentage of filler material can be reduced to 37 to 63% by volume through the special manufacturing process. increase.
- preforms with a barrier layer can also be produced which have an improved barrier effect against oxygen.
- a barrier layer for example made of nylon, EVH or the like
- the needle 37 in the production of preforms with a barrier layer, can be brought into position II in a first cycle step (FIG. 2b) in order to fill the cavity with the material used for the skin layer.
- the shut-off needle 37 is brought into a position I (FIG. 2a), and the barrier material (for example nylon) conveyed through the inner nozzle chamber 3 is injected into the mold cavity together with the component guided through the outer nozzle chamber 5.
- the barrier material comes to rest in the inner wall area of the preform and enables the molding to be provided with an extremely thin barrier layer of approximately 5% by volume or less.
- the barrier material is passed through the innermost nozzle chamber and sees this Method in a first cycle step to bring the needle 37 into a position I in which both the inner and the outer nozzle chamber are open, but only the material passed through the outer nozzle chamber 5 is conveyed into the mold cavity while the delivery of the material passed through the inner nozzle chamber 3 is stopped.
- the needle 37 remains in this position I and at the same time material is conveyed through the outer nozzle chamber 5 and barrier material through the inner nozzle chamber 3, so that the proportion of the barrier material accounts for approximately 5% or less of the total injected material.
- the shut-off needle remains in position I and the conveyance of those conveyed through the inner nozzle chamber 3 is increased
- Blocking material set After filling, the needle is moved to position III ( Figure 2c) to close the inner and outer nozzle chamber.
- the preforms produced in this way have a thin barrier layer which lies in the central wall area of the preform.
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA002303766A CA2303766A1 (en) | 1997-11-04 | 1998-11-04 | Method for producing multi-layered preforms |
JP2000518830A JP2001521837A (ja) | 1997-11-04 | 1998-11-04 | 多層予備成形体の製造方法 |
EP98951147A EP1028838A1 (de) | 1997-11-04 | 1998-11-04 | Verfahren zur herstellung von mehrschichtigen vorformlingen |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH02540/97A CH692573A5 (de) | 1997-11-04 | 1997-11-04 | Verfahren zur Herstellung von mehrschichtigen Vorformlingen. |
CH2540/97 | 1997-11-04 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1999022926A1 true WO1999022926A1 (de) | 1999-05-14 |
Family
ID=4236097
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/CH1998/000471 WO1999022926A1 (de) | 1997-11-04 | 1998-11-04 | Verfahren zur herstellung von mehrschichtigen vorformlingen |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1028838A1 (de) |
JP (1) | JP2001521837A (de) |
CA (1) | CA2303766A1 (de) |
CH (1) | CH692573A5 (de) |
WO (1) | WO1999022926A1 (de) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2000074920A1 (en) * | 1999-06-04 | 2000-12-14 | Husky Injection Molding Systems Ltd. | Injection nozzle and method for injection molding |
USRE38480E1 (en) * | 1999-06-04 | 2004-03-30 | Husky Injection Molding Systems Ltd. | Injection nozzle and method for injection molding |
CN100372740C (zh) * | 2004-08-12 | 2008-03-05 | 珠海保税区中富聚酯啤酒瓶有限公司 | Pet塑料容器坯、pet塑料容器坯的制造方法及设备 |
EP2279956A2 (de) | 2009-07-28 | 2011-02-02 | Gizeh Verpackungen GmbH & Co.KG | Ein durch Spritzgießen hergestllter, dünnwandiger, mehrschichtiger Verpackungsbehälter aus Kunststoff mit einer Barriereschicht und Verfahren zu dessen Herstellung |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN116209557A (zh) * | 2020-10-21 | 2023-06-02 | 赫斯基注塑系统有限公司 | 用于注射模制具有高比例内层材料的多层制品的机器和方法 |
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FR2241396A1 (de) * | 1973-08-24 | 1975-03-21 | Schloemann Siemag Ag | |
EP0199633A2 (de) * | 1985-04-12 | 1986-10-29 | Nissei Asb Machine Co., Ltd. | Verfahren zur Formung Mehrschichtige Gefässe |
EP0291640A2 (de) * | 1987-05-18 | 1988-11-23 | Husky Injection Molding Systems Ltd. | Spritzgiessen dreischichtiger Hohlkörper |
EP0325440A2 (de) * | 1988-01-19 | 1989-07-26 | Kamaya Kagaku Kogyo Co., Ltd. | Verfahren und Vorrichtung zur Herstellung von dreischichtigen Behältern |
JPH0232813A (ja) * | 1988-07-21 | 1990-02-02 | Mitsubishi Plastics Ind Ltd | 多層パリソン成形用射出ヘッド |
EP0380215A2 (de) * | 1989-01-25 | 1990-08-01 | Continental Pet Technologies, Inc. | Verfahren und Vorrichtung zum Spritzgiessen von mehrschichtigen Vorformlingen |
EP0624449A2 (de) * | 1993-05-13 | 1994-11-17 | Husky Injection Molding Systems Ltd. | Verfahren zum Formen von Gegenständen aus Kunststoff |
EP0768163A1 (de) * | 1995-10-13 | 1997-04-16 | Inter Tooling Services B.V. | Verfahren und Vorrichtung zur Herstellung von Hochkörpern aus Kunststoff |
EP0799683A2 (de) * | 1996-04-04 | 1997-10-08 | Fried. Krupp AG Hoesch-Krupp | Verfahren zum Spritzgiessen von dreischichtigen Spritzlingen und Vorrichtung für die Durchführung des Verfahrens |
DE19640662C1 (de) * | 1996-10-02 | 1998-03-05 | Krupp Ag Hoesch Krupp | Verfahren zum Spritzgießen von dreischichtigen Spritzlingen und Vorrichtung für die Durchführung des Verfahrens |
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JPH0243017A (ja) * | 1988-04-01 | 1990-02-13 | Kamaya Kagaku Kogyo Co Ltd | 三層容器の射出成形方法および三層容器の射出成形装置および三層容器 |
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1997
- 1997-11-04 CH CH02540/97A patent/CH692573A5/de not_active IP Right Cessation
-
1998
- 1998-11-04 JP JP2000518830A patent/JP2001521837A/ja active Pending
- 1998-11-04 CA CA002303766A patent/CA2303766A1/en not_active Abandoned
- 1998-11-04 EP EP98951147A patent/EP1028838A1/de not_active Withdrawn
- 1998-11-04 WO PCT/CH1998/000471 patent/WO1999022926A1/de not_active Application Discontinuation
Patent Citations (10)
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FR2241396A1 (de) * | 1973-08-24 | 1975-03-21 | Schloemann Siemag Ag | |
EP0199633A2 (de) * | 1985-04-12 | 1986-10-29 | Nissei Asb Machine Co., Ltd. | Verfahren zur Formung Mehrschichtige Gefässe |
EP0291640A2 (de) * | 1987-05-18 | 1988-11-23 | Husky Injection Molding Systems Ltd. | Spritzgiessen dreischichtiger Hohlkörper |
EP0325440A2 (de) * | 1988-01-19 | 1989-07-26 | Kamaya Kagaku Kogyo Co., Ltd. | Verfahren und Vorrichtung zur Herstellung von dreischichtigen Behältern |
JPH0232813A (ja) * | 1988-07-21 | 1990-02-02 | Mitsubishi Plastics Ind Ltd | 多層パリソン成形用射出ヘッド |
EP0380215A2 (de) * | 1989-01-25 | 1990-08-01 | Continental Pet Technologies, Inc. | Verfahren und Vorrichtung zum Spritzgiessen von mehrschichtigen Vorformlingen |
EP0624449A2 (de) * | 1993-05-13 | 1994-11-17 | Husky Injection Molding Systems Ltd. | Verfahren zum Formen von Gegenständen aus Kunststoff |
EP0768163A1 (de) * | 1995-10-13 | 1997-04-16 | Inter Tooling Services B.V. | Verfahren und Vorrichtung zur Herstellung von Hochkörpern aus Kunststoff |
EP0799683A2 (de) * | 1996-04-04 | 1997-10-08 | Fried. Krupp AG Hoesch-Krupp | Verfahren zum Spritzgiessen von dreischichtigen Spritzlingen und Vorrichtung für die Durchführung des Verfahrens |
DE19640662C1 (de) * | 1996-10-02 | 1998-03-05 | Krupp Ag Hoesch Krupp | Verfahren zum Spritzgießen von dreischichtigen Spritzlingen und Vorrichtung für die Durchführung des Verfahrens |
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Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2000074920A1 (en) * | 1999-06-04 | 2000-12-14 | Husky Injection Molding Systems Ltd. | Injection nozzle and method for injection molding |
US6214275B1 (en) | 1999-06-04 | 2001-04-10 | Husky Injection Molding Systems Ltd. | Injection nozzle and method for injection molding |
USRE38480E1 (en) * | 1999-06-04 | 2004-03-30 | Husky Injection Molding Systems Ltd. | Injection nozzle and method for injection molding |
CN100372740C (zh) * | 2004-08-12 | 2008-03-05 | 珠海保税区中富聚酯啤酒瓶有限公司 | Pet塑料容器坯、pet塑料容器坯的制造方法及设备 |
EP2279956A2 (de) | 2009-07-28 | 2011-02-02 | Gizeh Verpackungen GmbH & Co.KG | Ein durch Spritzgießen hergestllter, dünnwandiger, mehrschichtiger Verpackungsbehälter aus Kunststoff mit einer Barriereschicht und Verfahren zu dessen Herstellung |
DE102009035058A1 (de) | 2009-07-28 | 2011-02-10 | Gizeh Verpackungen Gmbh & Co. Kg | Ein durch Spritzgießen hergestellter, dünnwandiger, mehrschichtiger Verpackungsbehälter aus Kunststoff mit einer Barriereschicht und Verfahren zu dessen Herstellung |
Also Published As
Publication number | Publication date |
---|---|
EP1028838A1 (de) | 2000-08-23 |
CH692573A5 (de) | 2002-08-15 |
JP2001521837A (ja) | 2001-11-13 |
CA2303766A1 (en) | 1999-05-14 |
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