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
  • B65D85/00—Containers, packaging elements or packages, specially adapted for particular articles or materials
  • B65D85/70—Containers, packaging elements or packages, specially adapted for particular articles or materials for materials not otherwise provided for
  • B65D85/84—Containers, packaging elements or packages, specially adapted for particular articles or materials for materials not otherwise provided for for corrosive chemicals
• • 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
  • B29C49/0005—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor characterised by the 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
  • 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
• • 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
  • B29C49/22—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor using multilayered preforms or parisons
• • 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
  • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
  • B29K2023/04—Polymers of ethylene
  • B29K2023/06—PE, i.e. polyethylene
• • 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
  • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
  • B29K2023/04—Polymers of ethylene
  • B29K2023/06—PE, i.e. polyethylene
  • B29K2023/0608—PE, i.e. polyethylene characterised by its density
  • B29K2023/065—HDPE, i.e. high density polyethylene
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
  • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
  • C08L23/04—Homopolymers or copolymers of ethene
  • C08L23/06—Polyethene

Definitions

• Multi-layer device for storing and transporting chemicals
• the invention relates to a multi-layer device for storing and transporting chemicals, in particular liquid, high-purity chemicals for the electronics industry.
• liquid chemicals are required in many cases, the purity of which places high demands.
• a high degree of purity is required in particular in the production of highly integrated microchips, due to the ever smaller dimensions of these microchips produced using process chemicals.
• the requirements for the purity of liquid specialty chemicals for example process chemicals for the electronics industry, have increased significantly in recent years. It is no longer sufficient to produce the chemicals in the required purity, but it must also be ensured that the product is no longer contaminated during transport, storage and handling. In addition, storage and transport safety must be ensured, since some of these chemicals can be aggressive or even toxic. Unintentional leakage, for example due to damage to the transport container or due to leaks, must be prevented with the greatest possible security.
• the choice should be made to exclude any contamination caused by the wall material of the container coming into contact with the chemical to be transported or stored.
• the container In addition to avoiding the contamination of the chemical to be transported and the resistance to possible leaching by the chemical to be transported, the container must also have both sufficient rigidity and a certain elasticity, so that the container is insensitive to pressure and shock and stable and neither for Deformation tends to crack. Furthermore, it is desirable that the capacity of the container is comparatively large and that it is quick and easy to manufacture.
• HD polyethylenes with a specific density of 0.940-0.970 g / cm 3 , in particular 0.942-0.961 g / cm 3 .
• An object of the present invention is to provide a further device for storing and transporting chemicals, in particular high-purity, liquid chemicals for the electronics industry, and a corresponding method for producing a device according to the invention, which meet the above-mentioned requirements and moreover a simple one and enable fast manufacturing.
• a device for storing and transporting chemicals, in particular liquid, high-purity chemicals for the electronics industry which has at least the following components: a) a multi-layered inner container which has an inner, filling-side shell made of a stabilizer-free PE-HD and at least one shell made of polyethylene surrounding the inner shell, and b) a metal-free transport device made of plastic.
• stabilizer-free HD-PE is understood to mean HD-PE which has been produced without any use of the normally customary stabilizers.
• Normally customary stabilizers are, in particular, antioxidants which are known to the person skilled in the art (see, for example, plastics 78 (2), 142 (1988)).
• the method of multi-layer bubble extrusion or co-extrusion is chosen to produce a device for storing and transporting a high-purity chemical.
• the mechanically weak, high-purity innermost shell made of stabilizer-free HD-PE is used on the product side, while the material of the at least one shell enclosing the inner shell is a freely selectable, known, extrudable material, such as conventional HD-PEs with a density of 0.94. 0.97 g / cm 3 , such as Lupolen ® 4261AQ135 or Lupolen ® 5261Z, and the corresponding Hostalen ® products.
• the method of multi-layer blown extrusion allows the inner container of the device according to the invention to be produced in one continuous operation. This saves considerable costs and time compared to the welding processes used to date.
• the device according to the invention has a significantly higher pressure and drop resistance than previously known containers, since it is made from one piece and has no welds or similar weak points.
• coextrusion several layers of polymer melt are placed on top of one another in the extrusion die and joined together.
• Such multi-layer nozzles have multiple melt inlets and a common outlet channel.
• the multi-shell inner container of the device is placed in a metal-free transport device made of plastic.
• the metal-free transport device is preferably an all-plastic transport box made of metal-free plastic.
• the transport box has an integrated pallet for protection against transport damage.
• the inner pallet of the device according to the invention receives more stability and support through the integrated pallet.
• the stabilizer-free HD-PE is preferably a polyethylene with a specific density in a range from 0.940 to 0.970 g / cm 3 , in particular from 0.942 to 0.961 g / cm 3 , particularly preferably from 0.946 to 0.960 g / cm 3 , that is particularly low in contact with high-purity, liquid chemicals
• the stabilizer-free HD-PE is a polyethylene with a specific density in a range from 0.940 to 0.970 g / cm 3 , in particular from 0.942 to 0.961 g / cm 3 , particularly preferably from 0.946 to 0.960 g / cm 3 , which gives off at least one of the following ionic impurities as follows in contact with basic, neutral and acidic, high-purity chemicals:
• the unstabilized HD-PEs are also characterized by a low content of catalyst residues, which means that particularly small amounts of ionic impurities are released from these materials both in contact with basic and with acidic, high-purity chemicals.
• comparatively few particles are generated by any interaction between the chemicals to be stored or transported and the material.
• the content of particles preferably behaves as follows:
• the HD-PE which is sold under the brand Lupolen ® 4261AQ149, is particularly preferably used.
• the purity for high purity chemicals is given with this material.
• this material is easy to extrude.
• At least one further layer of the device is preferably made from an extrudable polymer or copolymer, preferably from an HD-PE with a specific density in a range from 0.940 to 0.970 g / cm 3 , in particular from 0.942 to 0.961 g / cm 3 , particularly preferably from 0.946 to 0.960 g / cm 3 .
• the outermost layer of the group Lupolen comprises at least one HD-PE ® 5261 D, Lupolen ® 4261AQ135, Hostalen ® GM6255, Fina ® 56020, Borealis ® 8214, Stamylan ® 7731 and 7890, Daplen ® AH 5493 or a mixture from two or more of the HD-PE of this group.
• the outermost layer comprises pigments which protect the layer against UV light. This prevents any damage to the device caused by light radiation, in particular when the device is being transported.
• the layer retains its mechanically stable properties.
• Carbon black is preferably used here as the pigment, but quartz, customary master batches and other customary pigments, such as, for example, Cu-phthalocyanine or TiO 2 , and also organic UV stabilizers and biphenyl compounds can be used.
• the outermost layer is reinforced in order to further increase the pressure, drop and impact resistance of the device according to the invention, for example by means of glass fibers or by adding further mechanically stable materials, such as polymers.
• Polyamide flakes are preferably incorporated into the outermost layer to enable reinforcement.
• PE composites such as Selar can be incorporated.
• the device is constructed with two shells.
• the innermost shell preferably made of Lupolen ® 4261AQ149, contributes preferably 20% to 40% to the wall thickness, while the outermost layer accordingly contributes 60% to 80%. This configuration has proven to be particularly stable.
• the device has at least three layers, the at least one middle layer consisting of production-related waste. It is the so-called slug waste; these are the parts that fall off at the top and bottom of the device when it is "finished".
• the device according to the invention preferably has at least one opening, preferably a plurality of openings.
• the openings are used to receive dip tubes or bung plugs. These are preferably made from one or more of the following materials: PE-HD, perfluoroalkoxy polymers (PFA), polypropylene, PVdF and perfluorinated polyethylene propylene (FEP).
• the openings can be adapted by inserting special molded parts into the blow mold or using appropriate adapters from different extraction systems, such as dip tubes or coupling systems. This enables low-contamination filling and / or product removal from or from the containers.
• the metal-free transport device is designed such that it can completely enclose the multi-layer inner container.
• the metal-free transport device is preferably a metal-free all-plastic transport box into which the multi-layer inner container can be placed.
• the transport box is made from an LLD-PE.
• the box is manufactured using a two-layer process, with both the outer layer and the inner layer being rotationally sintered and using e.g. with LLD-PE granulate mixed with pentane or hexane.
• This transport box is preferably provided with a protective cover, which is preferably made of the same material, and with the help of which the transport box can be completely closed, so that the inner container located therein is completely protected from the outside.
• the transport box preferably has a pallet in its interior which protects the inner container from damage in transit.
• the transport box is preferably produced by rotational sintering. Due to the manufacturing process, it is possible to produce a drop-resistant and inexpensive box.
• the invention further relates to a co-extrusion process for producing a device for storing and transporting chemicals, in particular liquid, high-purity chemicals for the electronics industry, the process comprising at least the following steps: a. Blow molding production of a hollow body from a stabilizer-free HD-PE; b. Simultaneously blowing the hollow body from a) with at least one shell made of polyethylene (co-extrusion), c. Manufacture of a plastic container in such a way that the hollow body from a) enclosed by at least one polyethylene shell can be set therein.
• the plasticizing step is preferably carried out within the process according to the invention with an inert gas blanket.
• Nitrogen is preferably used as the inert gas. This means that in the case of blow molding production, the air used is not the air but the corresponding inert gas, preferably nitrogen.
• the superposition of nitrogen during the manufacture of the device according to the invention displaces the oxygen originating from the ambient air or shields it from the polyethylene required for the manufacture, so that oxidative disturbances of the unstabilized polyethylene are avoided in the individual process steps.
• the oxidative disturbances can be, for example, lattice disturbances caused by embedded oxygen molecules or the node formation already mentioned.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Manufacturing & Machinery (AREA)
• General Chemical & Material Sciences (AREA)
• General Health & Medical Sciences (AREA)
• Toxicology (AREA)
• Health & Medical Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Chemical & Material Sciences (AREA)
• Packages (AREA)
• Containers Having Bodies Formed In One Piece (AREA)
• Laminated Bodies (AREA)
• Rigid Containers With Two Or More Constituent Elements (AREA)

Applications Claiming Priority (3)

Publications (1)

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Family Applications (1)

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• 1999
  • 1999-05-28 DE DE19924650A patent/DE19924650A1/de not_active Withdrawn
• 2000
  • 2000-05-23 WO PCT/EP2000/004686 patent/WO2000073154A2/de not_active Application Discontinuation
  • 2000-05-23 KR KR1020017015214A patent/KR20020047040A/ko not_active Application Discontinuation
  • 2000-05-23 EP EP00938675A patent/EP1261523A2/de not_active Withdrawn
  • 2000-05-23 CA CA002375200A patent/CA2375200A1/en not_active Abandoned
  • 2000-05-23 AU AU53966/00A patent/AU5396600A/en not_active Abandoned
  • 2000-05-23 JP JP2000621237A patent/JP2004513844A/ja active Pending
  • 2000-05-23 CN CN00808167A patent/CN1409678A/zh active Pending
  • 2000-06-20 TW TW089110286A patent/TW492937B/zh active

Non-Patent Citations (1)

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