# US 8,772,393 B2 · Plastic formulation and method for the production of plastic bottles in a two-stage stretch blow-molding process > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,772,393 B2 - Document ID: US8772393B2 - Status: Granted - Kind: B2 - Application number: 14/085,193 - Filed: 2013-11-20 - Published: 2014-03-20 - Granted: 2014-07-08 - Earliest claimed: 2008-07-24 - Assignees: Alpla Werke Alwin Lehner GmbH & Co. KG - Applicants: Alpla Werke Alwin Lehner GmbH & Co. KG - Inventors: Robert Siegl - Web page: https://patentgrep.com/patent/US8772393B2 ## CPC - B29C 49/08: Biaxial stretching during blow-moulding - B29C 49/0005: {characterised by the material} - B29C 49/06: Injection blow-moulding - B29C 49/12: Stretching rods - C08L 23/06: Polyethylene - B29B 11/08: Injection moulding - B29B 11/12: Compression moulding - B29B 11/14: characterised by structure or composition - B29C 45/0001: {characterised by the choice of material} - B29C 45/0013: {using fillers dispersed in the moulding material, e.g. metal particles} - B29C 49/071: {Preforms or parisons characterised by their configuration, e.g. geometry, dimensions or physical properties} - B29C 49/087: {Means for providing controlled or limited stretch ratio} - B29C 2049/023: {using inherent heat of the preform, i.e. 1 step blow moulding} - B29C 2049/7862: {characterised by temperature values or ranges} - B29C 2049/7879: {Stretching, e.g. stretch rod} - B29C 2949/0715: the preform having one end closed - B29C 2949/0811: Wall thickness - B29C 2949/22: at neck portion - B29C 2949/24: at flange portion - B29C 2949/26: at body portion - B29C 2949/28: at bottom portion - B29C 2949/3024: characterised by the number of components or by the manufacturing technique - B29C 2949/3032: having components being injected - B29C 2949/3056: having components being compression moulded - B29K 2023/065: {HDPE, i.e. high density polyethylene} - B29K 2105/16: Fillers - B29K 2105/253: {Preform} - B29K 2105/258: {Tubular} - C08L 2205/02: containing two or more polymers of the same C08L -group - 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 (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00) - C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06) - B29B: PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS - 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 ## Abstract An exemplary plastic formulation is disclosed for the production of plastic bottles in a two-stage stretch blow-molding process, and includes at least 60% of HDPE (High Density Polyethylene) having a density of 0.941 g/cm3 to 0.965 g/cm3 and according to ISO 1133 a melt index 190° C./2.16 kg of 0.1 to 0.9 g/10 min. The HDPE contains a mono-modal or multi-modal HDPE having a second melt index 190° C./21.6 kg of 5 g/10 min to 50 g/10 min according to ISO 1133. A method is disclosed for producing a plastic bottle in a two-stage stretch blow-molding process using the plastic formulation. ## Claims ### Claim 1 Method for producing a plastic bottle in a two-station stretch blow-molding process, comprising: producing a preform from a plastic formulation in an injection molding process or in a flow molding process from a plastic formulation; and producing a plastic bottle separately from the preform in space and/or time, in a stretch blow-molding process, wherein the preform is axially and radially stretched, and wherein the plastic formulation is based on an at least bimodal HDPE containing at least 60% HDPE (high density polyethylene) of a density from 0.941 g/cm3 to 0.965 g/cm3 and with a first melt index 190° C./2.16 kg from 0.1 to 0.9 g/10 min according to ISO 1133, the HDPE comprising a monomodal or multimodal HDPE with a second melt index 190° C./21.6 kg from 5 g/10 min to 50 g/10 min according to ISO 1133. ### Claim 2 (depends on 1) Method as claimed in claim 1, comprising: producing the preform with an injection point which has a diameter from 2 mm to 5 mm; and injecting the preform with pressures between 200 bar and 2000 bar in a hot channel. ### Claim 3 (depends on 1) Method as claimed in claim 1, comprising: producing the preform with an average wall thickness from 2.1 mm to 2.9 mm. ### Claim 4 (depends on 1) Method as claimed in claim 1, comprising: heating the preform to a temperature from 115° C. to 135° C. for processing in the stretch blow-molding process. ### Claim 5 (depends on 1) Method as claimed in claim 1, comprising: axially stretching the preform in the stretch blow-molding process in a longitudinal stretching ratio from 1.8 to 3.2. ### Claim 6 (depends on 5) Method as claimed in claim 5, wherein an axial stretching rate is 0.8 m/s to 2 m/s. ### Claim 7 (depends on 1) Method as claimed in claim 1, comprising: radially stretching the preform in the stretch blow-molding process in a diameter stretching ratio from 2.4 to 3.6. ### Claim 8 (depends on 2) Method as claimed in claim 2, comprising: inflating, and axially stretching, the preform in the stretch blow-molding process such that an inflated bottle, in areas between corners and edges, has a fluctuation of its wall thickness which is smaller than +0.5 mm. ### Claim 9 (depends on 8) Method as claimed in claim 8, comprising: producing the preform with an average wall thickness from 2.1 mm to 2.9 mm. ### Claim 10 (depends on 9) Method as claimed in claim 9, comprising: heating the preform is heated to a temperature from 115° C. to 135° C. for processing in the stretch blow-molding process. ### Claim 11 (depends on 10) Method as claimed in claim 10, comprising: axially stretching the preform in the stretch blow-molding process in a longitudinal stretching ratio from 1.8 to 3.2. ### Claim 12 (depends on 11) Method as claimed in claim 11, comprising: radially stretching the preform in the stretch blow-molding process in a diameter stretching ratio from 2.4 to 3.6.