Valve device for cavity blowing machines and method for injecting compressed air into a blowing volume

A technology of compressed air and valve device, applied in the field of valve device to achieve the effect of saving space

Active Publication Date: 2013-11-13
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Here, of course, this additional valve must be controlled separately and itself again forms an additional dead space, which must be filled and its remaining volume must be discharged into the surroundings via the exhaust valve

Method used

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  • Valve device for cavity blowing machines and method for injecting compressed air into a blowing volume
  • Valve device for cavity blowing machines and method for injecting compressed air into a blowing volume
  • Valve device for cavity blowing machines and method for injecting compressed air into a blowing volume

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Embodiment Construction

[0039] From figure 1 A purely schematic view of the basic structure of an embodiment of the valve device according to the invention is clearly seen in .

[0040] For example, a hollow body that can be made of plastic, such as a PET bottle, starts from a blank placed in a blowing cylinder 100 and is extended by blowing compressed air and by means of an extension mandrel or extension rod 102 introduced into the inside of the blank, in the known Mode blown or formed into its intended shape.

[0041] In order to supply the blowing cylinder 100 with the compressed air necessary for the process, the valve device 103 according to the invention is used, which supplies the pre-blowing air from the pressure source P1 at each pressure level for each adjustable time period pressure and the real working - or main blow pressure from pressure source P2. In particular, the magnitude and duration of the pre-blow pressure are of great importance for the blow process, since this results in a c...

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Abstract

The valve device, for injecting compressed air into a blowing volume of a parison with a first pressure supply (P1) and a second pressure supply (P2) and with inlet and outlet lines which may be closed by valves, comprises three switching valves (U1, U2, U3). A first switching valve (Ul) with two inlets (U1E1, U1E2) and one outlet (U1A) is provided in the supply region, the first inlet (U1E1) being connected to the first pressure supply (P1) and the second inlet (U1E2) to the second pressure supply (P2) and the outlet (UlA) to a first inlet (U2E1) of the second switching valve (U2), the outlet (U2A) of which is connected to the blowing volume. A second inlet (U2E2) to the second switching valve (U2) is connected to the outlet (U3A) of a third switching valve (U3) the first inlet (U3E1) of which is connected to atmosphere (EXH) and the second inlet (U3E2) of which is connected to a pressure recycle system (REC). The switching valves (U1, U2, U3) have a valve piston (2) designed as a hollow body, the cavity (3) of which is permanently openly connected to the outlet (30; U1A, U2A, U3A) of the relevant switching valve (U1, U2, U3).

Description

technical field [0001] The invention relates to a valve arrangement according to the preamble of claim 1 and to a method according to the preamble of claim 11 . Background technique [0002] For the manufacture of plastic bottles, especially polyester bottles (PET bottles), blanks or preforms are usually blown into their final shape in two steps in blow cylinders in hollow body blowers. For this purpose, the blank basically already has a finished bottle neck, which is held in the tuyeres of the hollow body blower and connected to the compressed air system. The blank is blown by blowing compressed air through the neck of the bottle and finally reaches its final shape. [0003] The actual blowing process is therefore carried out in a two-stage method, in which first the pre-blowing is carried out at a pressure value between 2 and 20 bar via the pre-blowing valve and then at a pressure value between 15 and 40 bar via the The main blow valve achieves final blowing, that is to ...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): B29C49/78B29C49/62B29C49/58
CPCB29C49/58B29C49/783B29C49/4289B29C49/06B29C49/12B29C49/62B29K2067/00B29C49/42Y02P70/10B29C49/42855B29C2949/0715B29C2049/6271B29C2049/7831B29C2049/7832B29C49/42845
Inventor奥斯马尔·赖曼
Owner오이겐자이츠아게