US20090269530A1 - Multilayer Plastic Container - Google Patents

Multilayer Plastic Container Download PDF

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Publication number
US20090269530A1
US20090269530A1 US12/301,147 US30114707A US2009269530A1 US 20090269530 A1 US20090269530 A1 US 20090269530A1 US 30114707 A US30114707 A US 30114707A US 2009269530 A1 US2009269530 A1 US 2009269530A1
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United States
Prior art keywords
layer
plastic
container
electrically conductive
outer layer
Prior art date
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Abandoned
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US12/301,147
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English (en)
Inventor
Klaus-Peter Schmidt
Frank Schuller
Reinhard Schubbach
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
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Mauser Werke GmbH
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Assigned to MAUSER-WERKE GMBH reassignment MAUSER-WERKE GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SCHMIDT, KLAUS-PETER, SCHUBBACH, REINHARD, SCHUELLER, FRANK
Publication of US20090269530A1 publication Critical patent/US20090269530A1/en
Abandoned legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/02—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by features of form at particular places, e.g. in edge regions
    • B32B3/08—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by features of form at particular places, e.g. in edge regions characterised by added members at particular parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B1/00—Layered products having a non-planar shape
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/306—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl acetate or vinyl alcohol (co)polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/34—Layered products comprising a layer of synthetic resin comprising polyamides
    • 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—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, by deep-drawing operations performed on sheet material
    • B65D1/12—Cans, casks, barrels, or drums
    • 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
    • B65D11/00—Containers having bodies formed by interconnecting or uniting two or more rigid, or substantially rigid, components made wholly or mainly of plastics material
    • B65D11/02—Containers having bodies formed by interconnecting or uniting two or more rigid, or substantially rigid, components made wholly or mainly of plastics material of curved cross-section
    • B65D11/06—Drums or barrels
    • 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
    • B65D25/00—Details of other kinds or types of rigid or semi-rigid containers
    • B65D25/14—Linings or internal coatings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B39/00—Packaging or storage of ammunition or explosive charges; Safety features thereof; Cartridge belts or bags
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B39/00—Packaging or storage of ammunition or explosive charges; Safety features thereof; Cartridge belts or bags
    • F42B39/14—Explosion or fire protection arrangements on packages or ammunition
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/24—All layers being polymeric
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/24—All layers being polymeric
    • B32B2250/242—All polymers belonging to those covered by group B32B27/32
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/20—Properties of the layers or laminate having particular electrical or magnetic properties, e.g. piezoelectric
    • B32B2307/202—Conductive
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/20—Properties of the layers or laminate having particular electrical or magnetic properties, e.g. piezoelectric
    • B32B2307/206—Insulating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/20—Properties of the layers or laminate having particular electrical or magnetic properties, e.g. piezoelectric
    • B32B2307/21—Anti-static
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2439/00—Containers; Receptacles
    • B32B2439/40—Closed containers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
    • Y10T428/1352—Polymer or resin containing [i.e., natural or synthetic]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
    • Y10T428/1352—Polymer or resin containing [i.e., natural or synthetic]
    • Y10T428/1379—Contains vapor or gas barrier, polymer derived from vinyl chloride or vinylidene chloride, or polymer containing a vinyl alcohol unit
    • Y10T428/1383—Vapor or gas barrier, polymer derived from vinyl chloride or vinylidene chloride, or polymer containing a vinyl alcohol unit is sandwiched between layers [continuous layer]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
    • Y10T428/1352—Polymer or resin containing [i.e., natural or synthetic]
    • Y10T428/139—Open-ended, self-supporting conduit, cylinder, or tube-type article
    • Y10T428/1393—Multilayer [continuous layer]

Definitions

  • the present invention relates to a method for producing electrostatically non-chargeable and/or electrically discharging plastic containers, and a multilayer plastic container produced with this method.
  • the plastic container can be formed as a jerrican or kraft extract, as a closed bunged drum, as lidded drum with drum lid and tension ring closure, or as an inner container of a large-volume pallet container.
  • Systems in commercial use and employed in explosion protection zones or to be filled with flammable contents are, for example, pallet containers with a inner plastic container produced by a multi-layer process with a conductive and/or permanently antistatic outer layer, wherein the content is grounded in the bottom region of the container by employing suitable measures, for example by using metal screws or conductive plastics on the discharge fitting.
  • the corresponding inner plastic containers are predominantly produced by a three-layer or six-layer co-extrusion process and have a total wall thickness of about 2-3 mm.
  • the residual insulating wall thickness remaining after subtraction of the conductive or permanently antistatic outer layer is hereby less than 2 mm.
  • a wall thickness of the insulating material of less than 2 mm in conjunction with a permanently connected electrical conductor is viewed as providing adequate safety for preventing charge buildup on the opposite surface of the insulator, which would ignite contents and gases of the explosion groups Group IIA and IIB with an adequate discharge.
  • the self-supporting plastic containers for example drums or jerricans, designed for use in explosion protection zones or for filling with flammable contents, are predominantly produced by a multilayer process and use a conductive and/or permanently antistatic plastic material in the outer layer. If necessary, the contents are electrically grounded by way of additionally inserted grounding elements made of conductive materials, for example by a pump pipe inserted into the container and made of electrically conductive plastic, which is electrically connected with the conductive outer layer of the container (EP 1 497 188 A).
  • a dischargeable plastic container which has a strip, similar to a viewing strip, made of conductive plastic material and introduced in the container wall (DE 102 42 955).
  • the strip is permanently connected with the conductive outer layer and has a thickness equal to the overall thickness of the three-layer container wall.
  • the entire container wall is completely severed in the longitudinal direction at one or several locations, because the connection of the electrically conductive plastic strip with the plastic material of the multilayer container wall always represents a critical contiguous weak spot when the filled container is subjected to greater mechanical stress.
  • the total wall thickness of a container has to be increased significantly above 2 mm to provide overall stability of the container (the average wall thickness of a 8.5 kg bunged drum in the surface region is approximately 3-3.5 mm), then the need for the insulating (inner) layers to be in direct contact with the conductive outer layer with a remaining residual thickness of maximally 2.5 mm can be attained only with a correspondingly thick outer layer made of conductive material.
  • This has significant disadvantages both due to economic and mechanical reasons, because suitable conductive plastic materials (e.g., by addition of carbon black) are relatively expensive and have significantly inferior material properties, for example with respect to their stability at low temperatures.
  • the container according to the invention is produced as a multilayer container preferably with an extrusion blow molding process and is characterized by at least one (inner, embedded) layer made of an electrically conductive plastic material and integrated in the wall of the container body, wherein the layer divides the remaining residual wall into at least two insulating plastic layers, each having a layer thickness of less than 2.5 mm.
  • the plastic material used for these layers is a HDPE plastic (high-density polyethylene).
  • the inner surface of the HDPE plastic layer in contact with the content is electrostatically charged either not at all or only slightly, if this inner, insulating and non-conductive plastic layer has a layer thickness of less than 2.5 mm or 2 mm, respectively.
  • the electrically conductive plastic layer After the electrically conductive plastic layer has absorbed sufficient electric charge and has attained a sufficiently high charge carrier concentration, these charge carriers are radially discharged to ground through the outer insulating plastic layer having a layer thickness of less than 2.5 mm or 2 mm, respectively, and across an electrically conductive support surface of the plastic container.
  • the negatively charged electrons/charge carriers which electrically charge the inner surface of the plastic container, are drawn through the layer which is made of HDPE virgin material in the radial direction across a very short distance (less than/equal to 2.5 mm) and received by the electric conductor, where they accumulate.
  • the charge gradient from the inside (high) to the outside (low) causes radially outward migration of the charge carriers through the “insulating layer”.
  • the electric conductivity of the electrically conductive plastic layer is adjusted through addition of carbon black compounds. Because carbon black is very expensive, the electrically conductive plastic layer is generally made very thin (less than/equal to 5% of the total wall thickness).
  • the innermost layer in contact with the liquid content may advantageously be made of HDPE virgin material, and the second integrated HDPE layer which is covered by the innermost virgin material layer is rendered electrically conductive by suitable additives (e.g., carbon black), wherein the outside of the electrically conductive layer is covered by at least one additional electrically non-conductive or insulating HDPE layer.
  • suitable additives e.g., carbon black
  • the material layer in contact with the content can consist of a particularly pure plastic raw material which is completely free of contamination, such as catalysts and stabilizers or harmful metal ions, thereby satisfying the high cleanliness requirements for the particular content.
  • catalyst residues, fillers, stabilizers, antioxidants, softeners/plasticizers or process aids, such as stearates etc are regarded as contaminants of the high-purity plastic material.
  • the additional, electrically non-conductive or insulating HDPE layer is interrupted by a narrow, vertically extending plastic strip made of an electrically conductive plastic material—similar to a viewing strip—, which—when viewed in the radial direction—has only the thickness of the additional, electrically non-conductive or insulating HDPE layer and has a positive and electrically conductive connection with the integrated, electrically conductive HDPE layer.
  • the plastic container has here an additional continuous, i.e., unbroken, inner layer made of HDPE virgin material which can optionally be made very thin with a wall thickness of only 0.5-1 mm, allowing the electric charges to be readily “suctioned through” and absorbed by the “inner” integrated electrically conductive plastic layer.
  • This integrated electrically conductive plastic layer has a good electrically conductive connection with the electrically discharging standing area of the plastic container by way of the narrow, vertically extending contact strip made of an electrically conductive plastic material, which is inserted in the outer, electrically non-conductive or insulating HDPE layer by a process similar to a conventional viewing strip and which extends in the bottom area of the container up to the parting line.
  • the electric discharge function of the container can be improved with a four-layer wall construction, wherein the fourth plastic layer externally covers the existing three layers and is also made of electrically conductive HDPE plastic material.
  • the fourth plastic layer externally covers the existing three layers and is also made of electrically conductive HDPE plastic material.
  • the third layer which is not made of a conductive plastic material, may also be interrupted by a narrow vertically extending contact trip made of an electrically conductive plastic material—similar to a viewing strip—, which—when viewed in the radial direction—has only the thickness of the electrically non-conductive or insulating HDPE layer, thus functioning as a conductive bridge which directly connects the integrated inner plastic layer made of electrically conductive plastic material electrically with the fourth outer layer made of electrically conductive plastic material.
  • discharge of the accumulated charge carriers from the integrated inner electrically conductive plastic layer can be promoted and accelerated by introducing at least one narrow vertically extending plastic strip made of an electrically conductive plastic material in the outer, electrically conductive plastic layer and the following, electrically non-conductive or insulating HDPE layer, wherein the strip—when viewed in the radial direction—has only the thickness of the two layers and has a positive and electrically conductive connection with the inner integrated, electrically conductive HDPE layer.
  • the one-part (single piece) plastic container produced by an extrusion blow molding process is implemented with at least three layers, for particular applications also with four or seven layers, and has the following layer construction:
  • Layer Layer Layer thickness Layer material 1 inside ⁇ 2.5 mm (up to ca. 45%) Insulating plastic (HDPE virgin material) 2 ⁇ 5% of the total wall Electrically conductive plastic thickness 3 ⁇ 2.5 mm (up to ca. 45%) Reclaimed process material + insulating plastic (HDPE) 4 outside ⁇ 5% of the total wall Insulating plastic (HDPE) thickness
  • the sensitive content then advantageously does not come into contact with the electrically conductive plastic layer (containing carbon black).
  • the maximum layer thickness of the insulating plastic layers in the entire wall is thereby less than 2.5 mm, thus preventing critical electric charge buildup of exposed insulating surfaces.
  • a lesser quantity of expensive conductive plastic materials is used due to the very thin construction of the corresponding layers.
  • These very thin layers of conductive plastic material are also substantially more flexible than a single brittle plastic layer with carbon black applied to the outside of a corresponding container, thereby significantly improving the low-temperature stability. It should be noted that the addition of carbon black—as is generally known—can significantly degrade the mechanical properties of electrically conductive plastics.
  • the container of the invention in the embodiment with electrically conductive plastic layers can also be constructed such that the insulating plastic layers are partially interrupted or bridged by conductive plastic material, thereby connecting the conductive layers inside the container wall with one another.
  • An essential feature of this local layer disruption is that the partial disruption of one layer does not lead to a disruption in the radial direction of other layers or all layers, so that no continuous conductive connection throughout the entire wall thickness is established.
  • mechanically weak areas in form of contiguous material accumulations (in the radial direction as well as in the axial direction) of the brittle conductive plastic which occurs with similar conventional solutions (DE 102 42 955 Sch.) are eliminated, which significantly improves the shock resistance of containers constructed in this way.
  • the conductive strips which are arranged over a limited local area within the non-conductive insulating plastic layers of the container wall extend preferably parallel to the longitudinal container axis in the vertical direction across the container body and radially across the bottom/top surface of the container.
  • the conductive contact strips may also have other forms, for example, a point-shape or a spiral-shape.
  • At least one local conductive connecting point is provided for each insulating layer. Additional locally conductive connecting strips for each layer can be easily implemented and applied depending on the manufacturing process.
  • the position of the local conductive connecting strips—as viewed in the circumferential direction—in the individual insulating layers can be freely selected for different embodiments having mutual offsets.
  • the strips are advantageously positioned in the container wall parallel to the container axis, or vertical, with an offset of about 10° from the mold parting line.
  • the two local conductive strips are arranged in the various layers with a mutual offset of 180°.
  • FIG. 1 shows a plastic container of the invention constructed as a to 20 liter L-ring drum
  • FIG. 2 shows a 3-layer construction of the invention with conductive center layer
  • FIG. 3 shows a 4-layer construction of the invention with conductive center layer
  • FIG. 4 shows a 7-layer construction of the invention with conductive center layer
  • FIG. 5 shows a 4-layer construction of the invention with conductive center layer and local conductive strips in the insulating layers
  • FIG. 6 shows a 7-layer construction of the invention with conductive center layer and local conductive strips in the insulating layers.
  • the plastic container of the invention can be formed, for example, as a jerrican or janett, as a bunged drum, as a lidded drum with drum lid and tension ring closure, or as an inner container of a large-volume pallet container.
  • a plastic container of this type has generally vertical container walls with a horizontal container top and bottom, wherein closable gas- and liquid-tight fill and drain openings are arranged at least in the container top or in the container lid, respectively.
  • FIG. 1 shows an embodiment of a 22 liter bunged drum, having the reference numeral 10 .
  • the average wall thickness of this bunged drum with a standard weight of 8.5 kg is approximately 3 mm to 3.5 mm in the wall region.
  • US version of a 22 liter bunged drum (55 US gallons) weighing in excess of 10 kg
  • the average total wall thickness is about 3.5 mm to 4.5 mm.
  • a rectangular wall segment in the vertical container wall of the drum 10 is indicated with “X”. Different embodiments of the wall construction of this wall segment will be more explained and described in more detail in the following figures.
  • the virgin material used for the inner and/or outer layer or for mixing with reclaimed material is preferably high density polyethylene (HD-PE, e.g., Lupolen 5021 D) or high-molecular polyethylene (HM-PE, e.g., Lupolen 5261 Z).
  • HD-PE high density polyethylene
  • HM-PE high-molecular polyethylene
  • the rectangular wall section “X” having a three-layer wall construction is shown in FIG. 2 , wherein the inner layer 12 in contact with the content is made of virgin HDPE material, the intermediate thin layer 14 is made of an electrically conductive HD-PE plastic by addition of carbon black, and the outer layer 16 is once more made of virgin HD-PE material, optionally with intermixed, for example blue, color pigments.
  • FIG. 3 shows a particularly preferred embodiment having a four-layer wall construction according to the invention with a thin conductive inner layer.
  • the inner layer 12 contacting the content is once more made of insulating plastic (HD-PE virgin material) having a layer thickness of, in this case, approximately 0.5 mm (which can reach about 45% of the total wall thickness)
  • the following integrated thin layer 14 is made of electrically conductive HD-PE plastic with a layer thickness of less than 5% of the total wall thickness
  • the third layer 16 which is now also an interior layer, is made of reclaimed process material and insulating plastic (HD-PE virgin material) with a layer thickness of about 1.5 mm or up to 45% of the total wall thickness
  • the outer fourth layer 18 (on the outside of the plastic container) is made again of electrically conductive plastic (HD-PE with carbon black) with a small layer thickness of less than 5% of the total wall thickness.
  • FIG. 4 Another exemplary embodiment is illustrated in FIG. 4 .
  • the wall construction (according to FIG. 3 ) for attaining optimal barrier properties to prevent leakage of volatile components (e.g., hydrocarbons, carbon dioxide, aromatic materials and the like) from the content is augmented up by three additional layers 20 , 22 and 24 , which are arranged between the comparatively thin electrically conductive layer 14 and the comparatively thick layer 16 .
  • the layer 22 is made of an isolating barrier plastic (polyamide PA or EVOH), and the two adjacent layers 20 and 24 are made of an insulating bonding agent (admer) for forming a material connection between the different plastic materials (HD-PE and polyamide PA or EVOH), which without a bonding agent would not adhere to one another merely through direct contact.
  • the layer thickness of each of these three thin layers 20 , 22 and 24 is only 3% of the total wall thickness.
  • the EVOH layer ethyl vinyl alcohol
  • the exemplary embodiment depicted in FIG. 5 has again a four-layer wall construction as in FIG. 3 ; however, at least two strips 26 and 28 made of an electrically conductive plastic and extending in the longitudinal container direction, or vertically, are inserted in the insulating plastic layers 12 and 16 . For example, two of each of these strips may be incorporated.
  • the strips can have a width (in the circumferential direction) of about 10 mm to 50 mm.
  • These strips 26 and 28 provide, on one hand, an electrically conductive bridge connection between the liquid content and the inner electrically conductive thin layer 14 and, on the other hand, an electrically conductive bridge connection between the inner electrically conductive thin layer 14 and the electrically conductive thin layer or outer layer 18 .
  • These two strips 26 and 28 which provide a connection to ground are introduced into the tubular preform in a conventional manner of a viewing strip.
  • the pre-form is extruded from an annular nozzle of a circumferential manifold or an extrusion accumulator head and expanded with compressed air in a blow mold to the shape of the finished container.
  • each of the two strips 26 , 28 extends in the wall of the respective container in the radial direction only partially, i.e., not all the way through.
  • the two strips 26 and 28 are laterally spaced apart and arranged with a mutual offset at different positions along the periphery of the plastic container.
  • this modified embodiment with at least two vertically extending contact strips having a mutual offset in the circumferential direction may also be implemented in a plastic container having a seven-layer wall construction.
  • the electrically conductive plastic strip 26 extends only inside the thick, electrically non-conductive plastic layer 12 and provides an electrical connection between the content and the inner conductive thin layer 14
  • the strip 30 extends radially across the layers 20 , 22 , 24 and 16 , forming an electric bridge between the integrated electrically conductive thin layer 14 and the electrically conductive thin outer layer 18 .
  • the inner integrated electrically conductive HDPE layer is in electrically conductive contact with the content inside the container via at least one contact strip made of electrically conductive plastic material and introduced in the inner layer made of insulating plastic (HDPE virgin material) which contacts the content, and is in addition in electrically conductive contact with the outer electrically conductive plastic layer via at least one additional contact strip made of non-conductive plastic material (without the addition of carbon black) and introduced in the remaining layers which cover the inner integrated electrically conductive HDPE layer from the outside.
  • insulating plastic HDPE virgin material
  • an electrical connection can hence be formed between the inner surface and the outer surface of the container, in combination with local sections made of conductive plastic material that are also integrated in the remaining insulating residual layers.
  • three different plastic materials are supplied from at least three extruders to a circumferential manifold and reshaped into a tubular preform having at least three layers, wherein the inner layer is made of an electrically non-conductive plastic material (HDPE virgin material), the integrated layer covered by the inner layer is made of an electrically conductive plastic material (e.g., HDPE with addition of carbon black), and an additional outer layer which is also made of an electrically non-conductive plastic material (HDPE), and wherein this tubular preform is expanded in a corresponding blow mold with compressed air to a hollow plastic body.
  • the circumferential manifold is additionally provided with appropriate means for introducing the contact strips made of electrically conductive plastic material at a desired location in the interior and/or exterior layers, which are made of an electrically nonconductive plastic material.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Laminated Bodies (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)
  • Packages (AREA)
  • Wrappers (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
US12/301,147 2006-05-18 2007-05-16 Multilayer Plastic Container Abandoned US20090269530A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE202006008091.0 2006-05-18
DE202006008091 2006-05-18
PCT/EP2007/004382 WO2007134781A2 (de) 2006-05-18 2007-05-16 Mehrschichtiger kunststoff-behälter

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2007/004382 A-371-Of-International WO2007134781A2 (de) 2006-05-18 2007-05-16 Mehrschichtiger kunststoff-behälter

Related Child Applications (1)

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US13/411,088 Continuation US8383219B2 (en) 2006-05-18 2012-03-02 Multilayer plastic container

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US20090269530A1 true US20090269530A1 (en) 2009-10-29

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ID=38565159

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Application Number Title Priority Date Filing Date
US12/301,147 Abandoned US20090269530A1 (en) 2006-05-18 2007-05-16 Multilayer Plastic Container
US13/411,088 Active US8383219B2 (en) 2006-05-18 2012-03-02 Multilayer plastic container

Family Applications After (1)

Application Number Title Priority Date Filing Date
US13/411,088 Active US8383219B2 (en) 2006-05-18 2012-03-02 Multilayer plastic container

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US (2) US20090269530A1 (es)
EP (1) EP2018265B1 (es)
JP (1) JP5124565B2 (es)
KR (1) KR101376627B1 (es)
CN (1) CN101500792B (es)
AU (1) AU2007251935B2 (es)
BR (1) BRPI0712033B1 (es)
CA (1) CA2652580C (es)
DE (1) DE112007001225A5 (es)
ES (1) ES2584835T3 (es)
IL (1) IL195275A (es)
MX (1) MX2008014601A (es)
MY (1) MY149059A (es)
SG (1) SG171642A1 (es)
WO (1) WO2007134781A2 (es)
ZA (1) ZA200809816B (es)

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US20090077905A1 (en) * 2007-09-20 2009-03-26 Tom Epple Electrically conductive swimming pool panel
US20120160729A1 (en) * 2006-05-18 2012-06-28 Mauser-Werke Gmbh Multilayer plastic container
EP2671545A2 (en) 2012-06-04 2013-12-11 MTB Poland sp. z o.o. Method for producing orthopaedic appliances, specifically those provided with rigid components for active stimulation of the injured area
USD782771S1 (en) 2015-04-03 2017-03-28 Geo Plastics Tight head drum
US20180117824A1 (en) * 2015-05-05 2018-05-03 Bodo Richter Method and Device for Producing Large-Volume Containers With Flange By Plastic Blow Molding
CN110548344A (zh) * 2019-09-21 2019-12-10 苏州科佳环境科技有限公司 一种抗静电防爆型方便维护保养的烧结板除尘器
US11192683B2 (en) * 2017-02-09 2021-12-07 Bodo Richter Double barrel for hazardous goods
USD938128S1 (en) 2020-01-06 2021-12-07 Geo Plastics Nestable drum
US20230023109A1 (en) * 2019-08-07 2023-01-26 Saipem S.P.A. Underwater storage tank, system of assessing the physical integrity of an underwater tank, method for detecting a loss of physical integrity of an underwater storage tank
US20230065269A1 (en) * 2021-08-28 2023-03-02 Brenda Droege Hazardous Containment Vessel
USD1001413S1 (en) 2020-06-30 2023-10-10 Geo Plastics Nestable drum

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FI124163B (sv) * 2008-06-30 2014-04-15 Uponor Infra Oy Behållare
JP5577854B2 (ja) * 2010-06-01 2014-08-27 日油株式会社 円筒状弾薬用容器
JP5577870B2 (ja) * 2010-06-14 2014-08-27 日油株式会社 円筒状弾薬用容器
JP5584031B2 (ja) * 2010-07-09 2014-09-03 株式会社ダイセル 発射装薬の収納容器
JP6156184B2 (ja) * 2014-02-21 2017-07-05 豊田合成株式会社 燃料供給装置
CN104263262A (zh) * 2014-04-28 2015-01-07 苏州恒坤精密电子有限公司 一种新型胶膜
BE1022703B1 (nl) * 2015-02-10 2016-08-17 CARDIFF GROUP,naamloze vennootschap Vat voor CO2-bevattende dranken en gebruik daarvan
CN110949121A (zh) * 2019-11-29 2020-04-03 安徽江淮汽车集团股份有限公司 一种油箱及具有该油箱的汽车

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Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120160729A1 (en) * 2006-05-18 2012-06-28 Mauser-Werke Gmbh Multilayer plastic container
US8383219B2 (en) * 2006-05-18 2013-02-26 Mauser-Werke Gmbh Multilayer plastic container
US20090077905A1 (en) * 2007-09-20 2009-03-26 Tom Epple Electrically conductive swimming pool panel
US8151523B2 (en) * 2007-09-20 2012-04-10 Tom Epple Electrically conductive swimming pool panel
EP2671545A2 (en) 2012-06-04 2013-12-11 MTB Poland sp. z o.o. Method for producing orthopaedic appliances, specifically those provided with rigid components for active stimulation of the injured area
USD782771S1 (en) 2015-04-03 2017-03-28 Geo Plastics Tight head drum
US10899062B2 (en) * 2015-05-05 2021-01-26 Bodo Richter Process and apparatus for the manufacture of large volume containers with flange by plastic blow molding
US20180117824A1 (en) * 2015-05-05 2018-05-03 Bodo Richter Method and Device for Producing Large-Volume Containers With Flange By Plastic Blow Molding
US11192683B2 (en) * 2017-02-09 2021-12-07 Bodo Richter Double barrel for hazardous goods
US20230023109A1 (en) * 2019-08-07 2023-01-26 Saipem S.P.A. Underwater storage tank, system of assessing the physical integrity of an underwater tank, method for detecting a loss of physical integrity of an underwater storage tank
US11802902B2 (en) * 2019-08-07 2023-10-31 Saipem S.P.A. Underwater storage tank, system of assessing the physical integrity of an underwater tank, method for detecting a loss of physical integrity of an underwater storage tank
CN110548344A (zh) * 2019-09-21 2019-12-10 苏州科佳环境科技有限公司 一种抗静电防爆型方便维护保养的烧结板除尘器
USD938128S1 (en) 2020-01-06 2021-12-07 Geo Plastics Nestable drum
USD1006394S1 (en) 2020-01-06 2023-11-28 Geo Plastics Nested nestable drums
USD1001413S1 (en) 2020-06-30 2023-10-10 Geo Plastics Nestable drum
US20230065269A1 (en) * 2021-08-28 2023-03-02 Brenda Droege Hazardous Containment Vessel

Also Published As

Publication number Publication date
EP2018265A2 (de) 2009-01-28
US20120160729A1 (en) 2012-06-28
JP5124565B2 (ja) 2013-01-23
ES2584835T3 (es) 2016-09-29
MX2008014601A (es) 2008-11-28
WO2007134781A2 (de) 2007-11-29
BRPI0712033B1 (pt) 2018-01-23
KR101376627B1 (ko) 2014-03-19
BRPI0712033A2 (pt) 2011-12-20
MY149059A (en) 2013-07-15
IL195275A0 (en) 2009-08-03
WO2007134781A3 (de) 2008-01-17
AU2007251935A1 (en) 2007-11-29
ZA200809816B (en) 2010-02-24
CN101500792B (zh) 2014-03-05
JP2009537402A (ja) 2009-10-29
KR20090029720A (ko) 2009-03-23
CN101500792A (zh) 2009-08-05
IL195275A (en) 2014-11-30
EP2018265B1 (de) 2016-04-27
DE112007001225A5 (de) 2009-04-23
SG171642A1 (en) 2011-06-29
CA2652580C (en) 2014-12-30
CA2652580A1 (en) 2007-11-29
US8383219B2 (en) 2013-02-26
AU2007251935B2 (en) 2011-10-06

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