Plastic and nonmetallic article shaping or treating: processes – Direct application of fluid pressure differential to... – Including application of internal fluid pressure to hollow...
Patent
1994-05-18
1996-11-05
Timm, Catherine
Plastic and nonmetallic article shaping or treating: processes
Direct application of fluid pressure differential to...
Including application of internal fluid pressure to hollow...
425183, 425195, 425525, B29C 4902, B29C 4928, B29C 4948
Patent
active
055714749
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a blow moulding machine for manufacturing blow moulded hollow bodies, in particular large-volume vessels, from thermoplastic synthetic material, and to a corresponding manufacturing process.
Conventionally, the process technique for this is to extrude from the tubular die of an accumulator a tubular preform of thermoplastic synthetic material between the open halves of an appropriate blowing mould, and thereafter the blowing mould halves are closed, the preform is pinched in or off, above and below, between the blowing mould halves and is blown by means of blown-in compressed air to give a hollow body having an external shape corresponding to the internal contour of the respective blowing mould for example a large-volume synthetic material vessel.
For the apparatus, blow moulds are known for this in which, for example, closed plugged vessels having two plug holes in the upper surface and having flange rings arranged in the region close to the upper surface and/or lower surface (carrying and transport rings or handling rings or peripheral roll rings) can be manufactured. The technique used here, of upsetting peripheral flange rings by means of axially displaceable mould slides is also generally known to the person skilled the art.
Furthermore, blowing moulds are known in which the vessel body for removable-cover vessels (wide-necked packing drums) is blown outward. These blowing moulds also have a mould slide for upsetting on a peripheral casing flange as the counter-bearing for a clamp ring, similarly reaching over the outer flange of the vessel cover, at the upper vessel edge close to the vessel opening, which is the size of the diameter. Such blowing moulds, having a permanently incorporated annular mould slide, have proved useful in the manufacture of vessels and are used in many countries of the world for manufacturing high-quality synthetic material vessels having flange rings which are moulded out of the vessel wall or are upset.
If a vessel manufacturer wishes to change his blow moulding machine with a blowing mould for one vessel type, e.g. a plugged vessel, over to the manufacture of another vessel type, e.g. a removable-cover vessel, then first of all he needs for this a corresponding second blowing mould. Thus, of these capital-intensive (blowing) moulds, in each case only one mould can ever be used for the respective vessel manufacture while the other blowing mould lies unused in storage.
When changing over or switching from one vessel type to another vessel type, hitherto the first blowing mould and the corresponding blowing mandrel had to be dismantled and the second blowing mould and the associated fitting blowing mandrel had to be installed and set up. In addition, the functional operation or control of the blowing mould equipment must be adjusted or changed over to the other vessel type.
This procedure requires stopping the machine for several hours, with the corresponding loss of production.
It is thus the object of the present invention to provide the vessel manufacturer with a blow moulding machine having a new blowing mould by means of which the blow moulding machine may be changed over from a first vessel type to another second vessel type in a shorter time than hitherto.
In accordance with the invention, this object is achieved in that a single blowing mould is used as the basic mould for the first vessel type and remains installed on changing over, and only at least one corresponding ring insert for adapting the vessel shape to the other second vessel type is inserted into the blowing mould and is secured by means of appropriate securing means. The blow moulding machine according to the invention for achieving this object is characterized by a blowing mould which is constructed as the basic mould for manufacturing the first vessel type and which may be changed over by means of at least one corresponding ring insert which may be inserted into the blowing mould and secured within the blowing mould to give the vessel shape of the other second vessel type.
Advan
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Feiereisen Henry M.
Mauser-Werke GmbH
Timm Catherine
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