Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
  • B29C49/42—Component parts, details or accessories; Auxiliary operations
  • B29C49/56—Opening, closing or clamping means
• • 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
  • B29C2949/0715—Preforms or parisons characterised by their configuration the preform having one end closed
• • 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
  • B29C49/06—Injection 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
  • B29C49/28—Blow-moulding apparatus
  • B29C49/30—Blow-moulding apparatus having movable moulds or mould parts
  • B29C49/36—Blow-moulding apparatus having movable moulds or mould parts rotatable about one axis
• • 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
  • B29C49/42—Component parts, details or accessories; Auxiliary operations
  • B29C49/56—Opening, closing or clamping means
  • B29C49/5601—Mechanically operated, i.e. closing or opening of the mould parts is done by mechanic means
  • B29C49/5603—Mechanically operated, i.e. closing or opening of the mould parts is done by mechanic means using toggle mechanism
• • 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
  • B29L2031/7158—Bottles

Definitions

• the present invention relates to a system for blow molding plastic containers.
• Systems for blow molding plastic containers which comprise an apparatus for blow molding preforms, so as to obtain containers such as for example bottles; typically, known apparatuses comprise one or more units for forming at least one container.
• the preforms are fed to the apparatus for blow molding the preforms by means of a conveyor that is associated with an oven for thermal conditioning of the preforms.
• the conveyor is normally associated with a preform transfer device, which is constituted for example by a handling device, which picks up the preforms from the conveyor to transfer them to the blow molding apparatuses.
• a preform transfer device which is constituted for example by a handling device, which picks up the preforms from the conveyor to transfer them to the blow molding apparatuses.
• linear apparatuses For very limited hourly production rates, which are typical for example of system designed for the blow molding of preforms to obtain medium/large size containers, so-called linear apparatuses are used in which the forming units are supported by a base frame and are provided with means for relative linear movement between two mold parts adapted to move between the loading/unloading position, in which the first mold part is spaced from the second mold part in order to allow to feed the preform and unload the blow molded container, and an active blow molding position, in which the first mold part is close to the second mold part in order to form at least one forming cavity for a respective container.
• linear movement combined with the fact that these forming units have a closed frame, allows an extremely simple management and a high stiffness of the press constituted by the two mold parts during the blow molding operations, in addition to having a relatively low production cost.
• rotary apparatuses are used to form the containers and are constituted by a blow molding carousel that can rotate about a main rotation axis and is provided, at its own peripheral region, with a plurality of forming units.
• Each forming unit comprises two mold parts which can move, with respect to each other, about a pivoting axis.
• each forming unit forms two forming cavities which are mutually spaced along a direction that is tangent to the peripheral region of the carousel.
• the preforms that arrive progressively from the heating oven have to wait for different times from exit from the oven to the moment of forming and this entails a lack of uniformity of the temperature that can cause inconstant characteristics in the containers obtained during the same forming process.
• Carousel systems instead have considerable costs, if hourly production rates that are not particularly high are required, and have, with reference to the blow molding of preforms to obtain medium- or large-sized containers, a certain complexity in the provision of the devices for transferring the preforms and the formed containers, and in particular of the clamp-like handling device, which, especially if forming units that form two forming cavities are used, must transfer the preforms with a movement that is tangential with respect to the carousel.
• the aim of the present invention is to solve the problems and obviate the drawbacks described above, by providing a system for blow molding containers that is extremely easy and practical to use.
• an object of the invention is to provide a system for blow molding containers that is extremely simple from the constructive standpoint and is capable of allowing an optimum management of the process.
• Figure 1 is a schematic perspective view of a system according to the invention during the step of insertion of the preforms in the forming unit after they have been taken from the feeder line in output from the heating and thermal conditioning oven;
• Figure 2 is a view, similar to Figure 1, of a constructive variation during the step of feeding the preforms to be blow molded to the blow molding apparatus;
• Figure 3 is a view of the step of picking up the preforms from the feeder line.
• the present invention relates to a system, generally designated by the reference numeral 1 , for blow molding plastic containers.
• the system 1 comprises a line 20 for feeding preforms 21 to an apparatus 2 for blow molding the preforms 21.
• the apparatus 2 for blow molding containers comprises a carousel 3 that can rotate about a main rotation axis, designated by the reference numeral 100, and supports a plurality of units 4 for forming at least one container.
• each forming unit 4 comprises a first mold part 5 and a second mold part 6 that can translate with respect to each other along a movement direction 101 in order to pass from a loading/unloading position, in which the first mold part 5 is spaced from the second mold part 6, and an active blow molding position, in which the first mold part 5 is close to the second mold part 6 in order to form at least one forming cavity 11 for a respective container.
• the rotating carousel 3 can rotate with a continuous rotary motion about the main rotation axis 100.
• the movement direction 101 has exclusively a linear or rectilinear component.
• each forming unit 4 comprises a supporting frame that has a closed structure 30 adapted to give high rigidity.
• the supporting frame with closed structure 30 comprises two lateral posts 31 that rise from a footing 33 and are connected in an upper region by a crossmember 32.
• Each forming unit 4 forms at least one forming cavity 11 for blow molding respective containers; in some cases the forming unit can have two or more forming cavities 11 for blow molding respective containers.
• the forming unit 4 forms at least two forming cavities 11, they are extended along respective longitudinal axes 102a, 102b that are substantially parallel.
• the longitudinal axes 102a, 102b of the forming cavities 11 are extended substantially parallel to the main rotation axis 100 of the carousel 3.
• the feeder line 20 comprises at least one conveyor 22 for preforms 21 and at least one pickup element 23.
• the pick-up element 23 is adapted to pick up the preforms 21 from the conveyor 22 to feed them to the forming units 4.
• the apparatus 2 is of course associated with a line, for example of the known type, for discharging the blow molded containers 12.
• the discharge line can comprise one or more discharge elements that have a structure and a kinematic movement mechanism that are similar to those of the pick-up elements 23.
• the forming units 4 are arranged, with their respective movement directions 101, along a broken line that is extended around the main rotation axis 100 of the carousel 3.
• the broken line is inscribed within the peripheral region of the carousel 3.
• the forming units 4 comprise a first mold part 5 that is fixed with respect to the carousel 3 and a second mold part 6 that can move on the carousel 3 in translation with respect to the first mold part 5 along a respective movement direction 101.
• the conveyor 22 is associated with at least one oven 22 a for conditioning the preforms 21.
• the system thus defined allows advantageously to increase the production rates, increasing the number of forming units 4 on the carousel 3, without increasing the number of cavities as in linear apparatuses.
• the lack of increase in the number of cavities in the forming units 4 prevents the lack of uniformity of the temperature of the preforms that can cause inconstant characteristics in the containers obtained during the same forming process.
• the materials used may be any according to requirements.

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• Engineering & Computer Science (AREA)
• Manufacturing & Machinery (AREA)
• Mechanical Engineering (AREA)
• Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
• Hydroponics (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=55642699

Family Applications (1)

Country Status (2)

Citations (5)

• 2015
  • 2015-12-18 IT ITUB2015A009425A patent/ITUB20159425A1/it unknown
• 2016
  • 2016-12-15 WO PCT/EP2016/081135 patent/WO2017102918A1/en active Application Filing

Patent Citations (5)

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