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Method for the stretch-blowing of a container, comprising a retraction of the stretch rod during a boxing operation

A technology of stretching blow molding and stretching rods, which is applied in the field of blowing stretching of containers including the retraction of the stretching rods during the impact operation, which can solve the problems of difficult impact, damage to the bottom of the mold, etc.

Active Publication Date: 2014-01-29
SIDEL PARTICIPATIONS SAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] As far as the magnetic control of the stretch rod is concerned, the magnetic control makes the impact difficult to implement because the force induced on the stretch rod by the control electromagnet is much higher than that caused by the common pneumatic control, and the manufacturer faces , either the impossibility of carrying out the impact due to the resistance of the stretch rod, or damage to the bottom of the die by punching between the bottom of the die and the stretch rod

Method used

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  • Method for the stretch-blowing of a container, comprising a retraction of the stretch rod during a boxing operation
  • Method for the stretch-blowing of a container, comprising a retraction of the stretch rod during a boxing operation
  • Method for the stretch-blowing of a container, comprising a retraction of the stretch rod during a boxing operation

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Embodiment Construction

[0044] exist Figure 1 to Figure 3 The upper part shows a container manufacturing machine 1 for manufacturing containers 2 by stretch blow molding of preforms, in this case preforms 3 , of plastics material such as PET, which comprises a substantially cylindrical body 4 , which A shaped neck 5 and a hemispherical bottom 6 closing the body 4 opposite the neck 5 .

[0045] In fact, the machine 1 is equipped with a series of individual stretch blow molding assemblies 7 mounted on a circular conveyor (not shown) driven in rotation about a central axis. Each stretch blown component, as in Figure 1 to Figure 3 Shown above, comprising a mold 8, a stretching unit 9 and a blown part, the blown part itself is known and not shown.

[0046] The mold 8 is for example of folder type and comprises two half-moulds hinged about a common hinge and open to allow continuously the ejection of the formed container 2 and the preform to be formed Part 3—preheating in the heating unit—introduction...

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Abstract

The invention relates to a method for producing a container (2) from a blank (3) in a stretch-blowing unit (7) comprising: a mould (8) provided with a wall (10) and a mould base (13) which can move axially between a projecting position and a retracted position, and a stretch unit (9) comprising a rod (21) which can move axially in relation to the wall (10) and a device (29) for controlling the movement of said rod (21). The method comprises: a first stretch-blowing phase; and a boxing phase during which the mould base (13), initially in the projecting position, is moved into the retracted position, said boxing phase including a retraction operation consisting in controlling a movement of the rod (21), synchronised with the movement of the mould base (13), or releasing the rod (21) in order to allow the free axial movement thereof.

Description

technical field [0001] The invention relates to the manufacture of containers by stretch blow molding of blanks of plastics material such as polyethylene terephthalate (PET). Background technique [0002] Whether referring to a preform or an intermediate container that has undergone a preforming operation, the blank consists of a generally cylindrical body of revolution, a neck forming the spout of the container to be formed, and a bottom closing the body opposite the neck . [0003] A common manufacturing technique consists in introducing the blank, preheated to a temperature above the glass transition temperature of the material (in the case of PET, approximately 80°C), into a mold provided with walls defining a cavity with a cavity for the container The cavity, and by injecting a fluid into the blank through the neck, the fluid, such as a gas (usually air), is pressurized to hold the material against the walls of the mould. [0004] Under the action of pressure, the hea...

Claims

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Application Information

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IPC IPC(8): B29C49/18B29C49/54B29C49/12
CPCB29C49/12B29C49/541B29C2049/4892B29C49/06B29C49/18B29C49/4815B29C49/78B29K2267/00B29C49/5612B29C2949/0715B29C2049/7879
Inventor M·德里安T·多P·普罗泰F·圣泰斯
Owner SIDEL PARTICIPATIONS SAS