EP1885542A2 - Extrusions-speicherkopf, verfahren zur herstellung von blasgeformten mehrschichtigen kunststoffhohlkörpern und hergestellter kunststoffhohlkörper - Google Patents

Extrusions-speicherkopf, verfahren zur herstellung von blasgeformten mehrschichtigen kunststoffhohlkörpern und hergestellter kunststoffhohlkörper

Info

Publication number
EP1885542A2
EP1885542A2 EP06724730A EP06724730A EP1885542A2 EP 1885542 A2 EP1885542 A2 EP 1885542A2 EP 06724730 A EP06724730 A EP 06724730A EP 06724730 A EP06724730 A EP 06724730A EP 1885542 A2 EP1885542 A2 EP 1885542A2
Authority
EP
European Patent Office
Prior art keywords
layer
plastic
functional layer
storage
storage space
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.)
Withdrawn
Application number
EP06724730A
Other languages
German (de)
English (en)
French (fr)
Inventor
Peter Langos
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mauser Werke GmbH
Original Assignee
Mauser Werke GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mauser Werke GmbH filed Critical Mauser Werke GmbH
Publication of EP1885542A2 publication Critical patent/EP1885542A2/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D1/00—Rigid or semi-rigid containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material or by deep-drawing operations performed on sheet material
    • B65D1/12—Cans, casks, barrels, or drums
    • B65D1/14—Cans, casks, barrels, or drums characterised by shape
    • B65D1/16—Cans, casks, barrels, or drums characterised by shape of curved cross-section, e.g. cylindrical
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/255—Flow control means, e.g. valves
    • B29C48/2556—Flow control means, e.g. valves provided in or in the proximity of dies
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/30—Extrusion nozzles or dies
    • B29C48/32—Extrusion nozzles or dies with annular openings, e.g. for forming tubular 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/30—Extrusion nozzles or dies
    • B29C48/32—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles
    • B29C48/335—Multiple annular extrusion nozzles in coaxial arrangement, e.g. for making multi-layered tubular articles
    • B29C48/337—Multiple annular extrusion nozzles in coaxial arrangement, e.g. for making multi-layered tubular articles the components merging at a common location
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/475—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using pistons, accumulators or press rams
    • B29C48/48—Two or more rams or pistons
    • 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
    • B29C49/04—Extrusion blow-moulding
    • B29C49/0411—Means for defining the wall or layer thickness
    • B29C49/04114—Means for defining the wall or layer thickness for keeping constant thickness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D77/00—Packages formed by enclosing articles or materials in preformed containers, e.g. boxes, cartons, sacks or bags
    • B65D77/04—Articles or materials enclosed in two or more containers disposed one within another
    • B65D77/0446—Articles or materials enclosed in two or more containers disposed one within another the inner and outer containers being rigid or semi-rigid and the outer container being of polygonal cross-section not formed by folding or erecting one or more blanks
    • B65D77/0453—Articles or materials enclosed in two or more containers disposed one within another the inner and outer containers being rigid or semi-rigid and the outer container being of polygonal cross-section not formed by folding or erecting one or more blanks the inner container having a polygonal cross-section
    • B65D77/0466—Articles or materials enclosed in two or more containers disposed one within another the inner and outer containers being rigid or semi-rigid and the outer container being of polygonal cross-section not formed by folding or erecting one or more blanks the inner container having a polygonal cross-section the containers being mounted on a pallet
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92504—Controlled parameter
    • B29C2948/9258—Velocity
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92504—Controlled parameter
    • B29C2948/9258—Velocity
    • B29C2948/926—Flow or feed rate
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92504—Controlled parameter
    • B29C2948/92609—Dimensions
    • B29C2948/92647—Thickness
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92819—Location or phase of control
    • B29C2948/92961—Auxiliary unit, e.g. for external melt filtering, re-combining or transfer between units
    • 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
    • B29C2949/072—Preforms or parisons characterised by their configuration having variable wall thickness
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • B29C48/10—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels flexible, e.g. blown foils
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/13—Articles with a cross-section varying in the longitudinal direction, e.g. corrugated pipes
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
    • B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
    • B29C48/21—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their surfaces
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/30—Extrusion nozzles or dies
    • B29C48/32—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles
    • B29C48/325—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles being adjustable, i.e. having adjustable exit sections
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/30—Extrusion nozzles or dies
    • B29C48/32—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles
    • B29C48/335—Multiple annular extrusion nozzles in coaxial arrangement, e.g. for making multi-layered tubular 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/30—Extrusion nozzles or dies
    • B29C48/32—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles
    • B29C48/34—Cross-head annular extrusion nozzles, i.e. for simultaneously receiving moulding material and the preform to be coated
    • 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
    • B29K2105/0005—Condition, form or state of moulded material or of the material to be shaped containing compounding ingredients
    • 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
    • B29K2105/0005—Condition, form or state of moulded material or of the material to be shaped containing compounding ingredients
    • B29K2105/0008—Anti-static agents
    • 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
    • B29K2105/26—Scrap or recycled material
    • 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
    • B29L2009/00—Layered products
    • 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
    • B29L2031/7126—Containers; Packaging elements or accessories, Packages large, e.g. for bulk storage
    • 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
    • B29L2031/7154—Barrels, drums, tuns, vats
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D2213/00—Safety means
    • B65D2213/02—Means for preventing buil-up of electrostatic charges

Definitions

  • the present invention relates to an extrusion storage head for a blow molding machine for the production of blow molded multilayer plastic hollow bodies, in which two or more peripheral manifolds are arranged above a storage space from which the circumferentially distributed plastic is ejected sequentially via a controllable annular nozzle by means of a displaceable ejection piston as a tubular preform.
  • the invention further relates to a process for the production of blow-molded multilayer plastic hollow bodies with this storage head and subsequently produced hollow plastic body.
  • blow molding machines with extrusion storage head for the production of blow molded multilayer plastic hollow bodies are well known, for example from US-A-5,256,051.
  • blow molding machines with extrusion storage head for producing multilayer plastic hollow body it is desirable if the plastic layers from the various extruders in the respective circumference distributors are distributed under rheologically almost identical conditions.
  • the peripheral manifolds are usually constructed concentric with each other. This results in several layers quickly to significant diameter dimensions of the storage head.
  • a further peripheral distributor is arranged, which via a delivery line to another external storage element for molten plastic (functional layer) connected with another separate extruder.
  • a further peripheral distributor below the hollow cylinder Shaped storage space in which the already “finished” two-layer preform is stored, in addition to an external thin third layer on the ejected by means of ejection piston preform "smeared" or applied.
  • the external storage element is also provided with a displaceable in a storage space discharge piston and arranged below the storage space closing valve.
  • the plastic material of the additional layer can be conveyed parallel to or simultaneously with the ejection process of the main storage head or independently thereof.
  • the annular ejection piston in the external storage element is designed to be displaceable within a likewise hollow-cylindrical storage space in which a central closing valve, preferably designed as a needle valve, is displaceably arranged.
  • blow molding machines in operation today for the production of blow molded packaging containers are designed as two-layer machines. Characterized in that the further, arranged between the storage space and the controllable annular nozzle of the extrusion storage head peripheral distributor is arranged with attached conveyor line in a replaceable ring kit, new or already in use two-layer blow molding machines in a simple and comparable cost-effective way to high-quality three-layer - Upgrade blow molding machines or multilayer machines for operation with a further additional plastic layer.
  • the further peripheral distributor is formed in a simple and cost-effective design with little design effort as a ring channel distributor.
  • the annular channel distributor is provided with at least one displaceable blocking element (blocking slide) which is arranged on its side opposite the conveying line so that the plastic material flowing into the annular channel distributor and circulating on both sides in the peripheral direction of the additional functional layer can not converge and thus become one Piece remains spaced apart.
  • blocking slide displaceable blocking element
  • This is z. B. then very advantageous if in the outside applied plastic layer (functional layer) additional color pigments are mixed and thereby the functional layer has a different color than the underlying plastic layer. Since additional color pigments or other additives to adjust certain properties are usually very expensive, this can achieve significant cost savings.
  • the externally applied plastic layer (functional layer) - viewed in the circumferential direction - is not formed completely encircling or not continuous, but is provided with at least one interruption such that the two opposite edges of the functional layer at least slightly spaced apart and leaving a longitudinal interruption strip on the extruded preform.
  • the interruption strip in the externally applied colored functional layer of the finished inflated container has a width of about 10 mm to 50 mm, depending on the volume of the container produced.
  • the outside applied plastic layer is not applied in the longitudinal direction over the entire length of the ejected preform, but only over a predetermined length on the extruded preform.
  • This particular variant of the method is very advantageous, for example, if special additives (such as, for example, nanoclay, metal fibers, conductive carbon black, antistatic masterbatch, polyamide copolymers or the like) are mixed into the plastic layer applied on the outside, the particular electrical or have electrostatic properties, whereby the inflated from the preform plastic hollow body can be provided with an electrically dissipative or an antistatic coating.
  • the layer thickness of the outer functional layer is set via a controllably variable ejection speed of the ejection piston in the additional external memory element.
  • the functional layer can be represented reproducibly in accordance with the velocity profile of the ejection piston in the additional memory element via the ejection length of the tube with a defined wall thickness profile. This basically offers the possibility of minimizing or completely switching off the functional layer in the slug area.
  • a uniform wall thickness of the functional layer in the later blown part can be achieved even with very different inflation ratios or degrees of stretch such as in the lower and upper corner regions of a parallelepipedic inner container for a pallet container, wherein on the extruded preform a partially thicker functional layer for the container corner areas very high degrees of stretching is applied (partial wall thickness control of the outer layer).
  • This will be an optimal Material utilization in the functional layer with cost minimization based on the blow part to be manufactured allows.
  • a blow molding machine with the extrusion storage head according to the invention has many advantages over a two-layer machine: the properties of the products produced can be improved by an electrically non-charging surface (permanent antistatic compounds), an electrically conductive surface (by mixed conductive carbon black), a optical layer (eg blue color pigments) and
  • the extrusion storage head according to the invention with separate storage and ejection piston for the outer functional layer allows the use and processing of various types of plastics, such as HD-PE (High Density Polyethylene) and LD-PE (Low Density Polyethylene), where as low-viscosity and high-viscosity Polyethylene great differences in the viscosities and the flow properties of the respective plastic melts are present.
  • the separate storage element with ejection piston offers excellent controllability and reaction speed, in particular. B. compared to a conventional pressure change in the melt stream by speed change of an extruder.
  • FIG. 1 shows an extrusion storage head according to the invention
  • Figure 2 shows a 1000 liter pallet container in side view
  • Figure 3 is a 220 liter plastic L-ring barrel
  • an extrusion storage head (battery head) is shown, are connected to the two extruders 12, 14 for producing a two-layer tubular preform.
  • the molten plastic material flows via two spiral channel distributors 16, 18 (circumferential distributors) into a storage space 20.
  • the storage space 20 is defined by the wall thickness and the stroke of a hollow-cylindrical ejection piston 22.
  • the circumferentially distributed plastic material is first accumulated in the storage space 20 and then sequentially by means of the discharge piston 22 discharged from the storage space 20 via a controllable annular nozzle 24 as a tubular preform.
  • a further peripheral distributor 26 is arranged between the storage space 20 and the controllable annular nozzle 24, which is connected via a delivery line 28 to a further storage element 30 for molten plastic (functional layer) with a separate extruder 32.
  • the further circumferential distributor 26 is formed in the present case as a simple annular channel distributor.
  • the cylindrical storage element 30 has a storage space in which an ejection piston 34 is slidably disposed.
  • a closing valve 36 which is likewise designed as a needle valve, is also centrally located in the center.
  • the molten plastic material for the functional layer is continuously fed from the separate extruder 32 into the storage element 30, wherein the discharge piston 34 is raised until the storage space is filled.
  • the plastic material of the functional layer is introduced via the delivery line 28 into the further peripheral distributor 26 of the extrusion storage head 10, from which it - in parallel to the ejection movement of the ejection piston 22 - in the, the tubular preform leading annular gap is so depressible that a thin plastic layer (outer functional layer) lays on the previously circumferentially distributed main plastic flow (carrier material).
  • the further annular channel peripheral distributor 26 is equipped on the, the delivery line 28 opposite side with a designed as a simple locking slide blocking element 40, by means of which the annular channel 26 can be partially closed over a certain width predetermined (lockable annular slot).
  • At least one visible strip can be formed in the outer wall of the hollow body by the outer plastic layer (functional layer), which is not completely applied over the circumference, into which optionally electrically conductive additives and / or color pigments are mixed Is arranged offset to the mold parting plane.
  • the housing of the additional annular channel distributor is very advantageously designed as a modular component and is simply used as an interposed ring assembly 38 with delivery line 28, storage element 30 and separate extruder 32 in the usual construction of a two-layer storage head.
  • the ring assembly 38 with the additional annular channel distributor can be used in newly built blow molding or retrofitting in existing two-layer blow molding.
  • a pallet container 42 for storage and transport of liquid or flowable products is shown as an application example.
  • the pallet container 42 consists of a thin-walled plastic inner container 44, a plastic inner container 44 tightly enclosing grid frame 46 of welded together bars and a plastic bottom pallet 48 on which the inner container 44 rests and on which the grid frame 46 is attached.
  • FIG. 3 shows, as a further example of application, a 220 liter plastic L-ring barrel 50 with an electrically dissipative barrel surface 52.
  • the thin functional layer is dyed black by admixing conductive carbon black.
  • a manufactured on the blow molding machine according to the invention three- or multi-layer plastic container, characterized in that the outer functional layer is very thin and only between 1% and 10%, preferably about 2%, the wall thickness of the tubular preform or the finished inflated Hollow body is, wherein the outer layer may have a different color than the middle and / or inner layer.
  • the outer layer is in one embodiment - viewed in the circumferential direction - not formed completely encircling or closed, but provided with at least one strip-like interruption such that the two opposite edges of the cover layer are at least slightly spaced from each other, and / or the middle and inner layer is visible from the outside.
  • the interruption in the outer colored functional layer should have a width of at least 10 mm in the finished inflated container so that at least one narrow, axially extending outer layer interruption strip is formed as a so-called visual strip.
  • any color pigments can be mixed. By using expensive color pigment additives only in the thin outer layer, colored or colored containers can be produced particularly cost-effectively.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Ceramic Engineering (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
EP06724730A 2005-05-10 2006-05-05 Extrusions-speicherkopf, verfahren zur herstellung von blasgeformten mehrschichtigen kunststoffhohlkörpern und hergestellter kunststoffhohlkörper Withdrawn EP1885542A2 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE202005007636 2005-05-10
PCT/EP2006/004224 WO2006119924A2 (de) 2005-05-10 2006-05-05 Extrusions-speicherkopf, verfahren zur herstellung von blasgeformten mehrschichtigen kunststoffhohlkorpern und hergestellter kunststoffhohlkorper

Publications (1)

Publication Number Publication Date
EP1885542A2 true EP1885542A2 (de) 2008-02-13

Family

ID=37192560

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Application Number Title Priority Date Filing Date
EP06724730A Withdrawn EP1885542A2 (de) 2005-05-10 2006-05-05 Extrusions-speicherkopf, verfahren zur herstellung von blasgeformten mehrschichtigen kunststoffhohlkörpern und hergestellter kunststoffhohlkörper

Country Status (5)

Country Link
US (1) US20080193582A1 (enExample)
EP (1) EP1885542A2 (enExample)
JP (1) JP4996597B2 (enExample)
DE (1) DE112006000926A5 (enExample)
WO (1) WO2006119924A2 (enExample)

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DE202007013318U1 (de) * 2007-09-21 2008-01-03 Mauser-Werke Gmbh Vorrichtung und deren Verwendung zur Herstellung von Kunststoff-Behältern mit Sichtstreifen
USD782771S1 (en) 2015-04-03 2017-03-28 Geo Plastics Tight head drum
DE102019129504B4 (de) 2019-10-31 2021-09-23 Protechna S.A. Kunststoffbehälter für Flüssigkeiten sowie Verfahren zur Herstellung eines Kunststoffbehälters
USD938128S1 (en) 2020-01-06 2021-12-07 Geo Plastics Nestable drum
CN111152438B (zh) * 2020-01-10 2025-05-16 潍坊市华玉塑料机械有限公司 生产带防静电涂层的ibc桶和双环桶用多层储料缸模头
JP7487574B2 (ja) * 2020-06-15 2024-05-21 セイコーエプソン株式会社 射出成形装置および方法
USD1001413S1 (en) 2020-06-30 2023-10-10 Geo Plastics Nestable drum

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Also Published As

Publication number Publication date
JP4996597B2 (ja) 2012-08-08
JP2008540174A (ja) 2008-11-20
US20080193582A1 (en) 2008-08-14
WO2006119924A3 (de) 2007-05-03
WO2006119924A2 (de) 2006-11-16
DE112006000926A5 (de) 2008-04-03

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