DE1906430C3 - Device for continuous deep-drawing of thermoplastic films with a rotating deep-drawing roller - Google Patents

Description

The invention relates to a device for the continuous deep drawing of thermoplastic films a circulating deep-drawing roller, whose deep-drawing molds after a heating area for the film in a reach a suction zone connected to a vacuum source, which acts as a suction slot in one of the deep-drawing rolls axially connected vacuum control ring is arranged.

In machines for deep-drawing foils or the like, it has proven to be particularly disadvantageous that when the machine is switched off of the machine and thus stopping the deep-drawing roller, a certain area of the already heated Foil is no longer formed. However, these foil parts have in the area when the machine starts up the suction zone still doesn’t have what is necessary for deformation Heating reached, so that there is an unavoidable reject. This reject becomes the continuous Process of the entire machine and subsequent packaging machines or the like significantly disrupted, since these foil parts which are not or only inadequately shaped are cut out or removed have to.

In order to remedy these difficulties and disadvantages, the arrangement is as follows in a known device made that when coasting or after each shutdown of the machine still additional already warmed up Parts of the film are deep-drawn that would otherwise no longer be formed in the restart phase, bus additional shaping of film parts after the deep-drawing roll has come to a standstill is known in this case Device achieved by adjusting the suction zone. d. that is, the one normally adjoining the heating zone The suction zone is moved to the area of the heating fence. For this purpose, the one assigned to the deep-drawing roller is assigned The vacuum control ring is adjusted by a certain angle in the direction of rotation of the deep-drawing roller. This adjustment is derived from the pivoting movement of the heating device via a lever system Eint * derUfttee device is not only proportionate elaborate, but also bgtüHjit the plural VUh köttstrüktlöhseiettieheh (CH-PS 4 153 0Ö4).

In terms of experience, HUH is based on the task of admonished Föüentelie with the help of an institution

n Föüentelie with the help of a device for deforming ⁹ , which is much simpler both in its structure and in its ÄHMsweisl · than the known VbrtlchtUHg;

For the purpose of lifting the tasks according to the invention VÖrgescMägehi fully separated from the constant with the Vakutttil connected Söugzöne in the heating area the heating device to arrange a second suction zone, which when or after stopping the Ilefzietiwalzen with the vacuum source V6rii | inden. To control the A magnet valve is provided in the area of the heating device.

This simple facility in the form of an additional The suction zone is achieved that when the deep-drawing roll is stopped, the area of the heating device Fqlienteile located are molded. At the

To start up the machine, the suction air for the im Area of the heating device arranged suction zone switched off, so that the deformation of the film again in the area of the suction pull downstream of the heating device takes place which the suction air is to take effect in the suction slot arranged in the area of the heating device, a time relay can be assigned to 'your' solenoid valve. A time relay is also assigned to the heating device with the help of which the turn-off time

so the heating device is adjustable Time at which the heating device is swiveled away after the deep-drawing roll has stopped and the time the effectiveness of the suction air in the area of the heating device on each other and in dependence

»5 must be coordinated with the film being processed in each case.

In the following the invention is based on one with the embodiment illustrated in the drawing. It shows

$ o F i g. 1 is a partial front view of the deep-drawing roll on average,

F i g. 2 shows a top view of the deep-drawing roll, partly in section.
As the figures show, the one with deep-drawing

JS form 1 provided deep-drawing roller 2 a fixed Associated with vacuum control ring 3. In this vacuum control ring 3 suction slots 4 and 5 are arranged inside the deep-drawing roll 2 channels β are provided, which are connected to suction openings 7 of the deep-drawing molds i

4b are binding and periodically come into the range of action of the suction slots 4 and 5 . The suction slot 4 is connected via a line H to a vacuum source, not shown, while the Säugscfilitz 5 is connected via a line 9, a solenoid valve 10 and a line U with the line 8 and thus with the vacuum pinch, not shown. In order to heat the film web ii drawn off from a supply roll (not shown), an arc-shaped heating device 13 is provided which rotates around the pivot point 14

Jb is pivoted

The mode of operation of the device is as follows: When the machine is operated continuously, the The film web 12 is heated by the heating device 13 and reaches the area of the suction slot 4, wherein

$ 5, the film web 12 is drawn into the deep-drawing molds 1 will. When switching off and thus when shutting down the deep-drawing roller 2, the Saugschtitit S upper dig Lektüttg § of the solenoid valve iö, dig LeiWiIg il Uhd dig Line S HiIt the not shown, ValcUUmtlüeiie

6ö connected, Io that the in the area of this ßiiügscMiizes 5 located Fölienbahhberöl'ch oftentoUhgslemltt IH die Deep-drawn orms i will be eihgözbgen. OilAetHg Will in doing so, in order to avoid consumption the heater swiveled away

This makes a committee, depending on the situation, desolate Incorrectly formed bloom parts tttlt Avoided safety and continuous drainage of the entire machine system

For this purpose 1 inflatable drawings

Claims (1)

Claim: Device for continuous deep-drawing of thermoplastic films with a circumferential Deep-drawing roller, the deep-drawing molds of which after a heating area for the film in one with a vacuum source connected suction zone, which is axially connected as a suction slot in one of the deep-drawing rolls Vacuum control ring is arranged, characterized in that separated from this suction zone (4), which is constantly connected to the vacuum source, in the heating area of the heating device (13) a second suction zone (5) is arranged, which is connected to the vacuum source when or after the deep-drawing roller (2) is stopped.