Method for producing a plastic container
A manufacturing method and container technology, which can be applied to household appliances, other household appliances, household components, etc., can solve the problems of reducing blowing pressure, high cost, shortening pressure holding time, etc., and achieve improved mechanical properties, reduced shrinkage, and cooling. effect of improvement
Pending Publication Date: 2021-06-11
西得乐集团
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Problems solved by technology
However, shortening the pressure holding time, combined with lowering the blowing pressure, may result in poorly formed packages (especially in the most complex parts of the forming), which, in addition to the aesthetic appearance, may also have a negative impact on the mechanical strength of the package influences
In order to meet the standard cycle time and adapt to the gradually increasing requirements, it is also possible to increase the number of manufacturing devices, but the cost is high and a large size space is required
Therefore, there is a negative impact on the ecological environment, because the resources (pressurized gas and especially electrical energy) required for container manufacturing increase
Method used
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Embodiment Construction
[0061] figure 1 A first blowing curve CS1 of a container is shown, which represents the standard manufacturing (or forming) of a container from a preform made of plastic by blowing or stretch-blowing in a manufacturing apparatus using one or more cold moulds. )cycle. Typically, the manufacturing device has a mold defining the cavity of the container to be formed and a blowpipe for sealing the mold closed.
[0062] In general, the blowing curve CSx (x here defines the sign of the curve) shows the pressure in the container (axis of ordinate) as a function of time (axis of abscissa).
[0063] Each blowing curve has at least the following three stages:
[0064] - Pre-blowing stage PSx.
[0065] - Blowing stage Sx.
[0066] - Degassing stage Dx.
[0067] The pre-blowing stage and the blowing stage together are called the molding process.
[0068] As will be detailed later, in the case of cold moulds, the blowing phase consists in the simple injection of high-pressure gas. In...
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The invention concerns a method for producing a container by blow moulding or stretch blow moulding in a production unit comprising a mould and a nozzle intended to hermetically seal the mould, the method comprising: - a moulding sequence with a blowing phase (S2); and - a degassing phase (D2), characterised in that the degassing phase (D2) comprises a moving apart (ET2) of the nozzle with respect to the mould in order to break the hermetic sealing, the moving apart of the nozzle being carried out: - after the start of the degassing phase (D2), when the pressure inside the container has dropped and has reached an intermediate pressure, less than the pressure at the end of the moulding sequence and between 14 and 3 bars, or after achieving the blowing phase, and in a time interval between 0 and 200 ms after the end of the injection of gas into the container.
Description
technical field [0001] The field of the invention is that of manufacturing plastic containers from blanks. [0002] More precisely, the invention relates to a method of manufacturing plastic containers with good mechanical properties in a manufacturing device having at least one mould, comprising a stage of blowing or drawing blown preforms in said mould. Background technique [0003] Relating to preforms or intermediate containers that have undergone a preforming operation, the blank has a generally cylindrical body of revolution, a neck constituting the mouth of the container to be formed and, opposite the neck, a bottom closing the body. [0004] The traditional manufacturing technique consists in feeding the blank, preheated to a temperature above the glass transition temperature of the material (approximately 76°C in the case of PET), into a mold whose walls define the cavity of the container, the neck of which pressurized gas Injection (usually air) into the blank so ...
Claims
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Patent Timeline
Login to View More IPC IPC(8): B29C49/62B29C49/78B29C49/06B29C49/42B29K67/00B29L31/00
CPCB29C49/06B29C49/4284B29C49/62B29C49/78B29C49/783B29K2067/003B29L2031/7158Y02P70/10B29C2949/0715B29C2049/6271B29C2049/7831B29C2049/7832B29C49/12
Inventor M·德里恩L·佩内特
Owner 西得乐集团