Apparatus for Producing Films Stretched In-Line

Patent metadata

Field	Value
Publication number	US-2016151950-A1
Application number	US-201414905577-A
Country	US
Kind code	A1
Filing date	Jun 5, 2014
Priority date	Jul 19, 2013
Publication date	Jun 2, 2016
Grant date	—

Abstract

The invention relates to an apparatus for producing tubular films stretched in-line by blow molding with an extruder, a film blowing line, a lay-flat unit, an oscillating haul-off unit, and a stretching line for monoaxially stretching the film laid flat in machine direction. According to the invention, the stretching line is arranged above the extruder between the lay-flat unit and the oscillating haul-off unit.

First claim

1 . An apparatus for producing tubular films stretched inline by blow molding with an extruder, a film blowing line a lay-flat unit, an oscillating haul-off unit, and a stretching line for rnonoaxially stretching the film laid flat in machine direction, wherein
the stretching line is arranged above the extruder between the lay-flat unit and the oscillating haul-off unit.

2 . The apparatus according to claim 1 , wherein the stretching line together with the haul-off unit provided downstream of the same in conveying direction is rotatably mounted on a platform above the lay-flat unit.

3 . The apparatus according to claim 2 , wherein on the platform beside the stretching line further components such as electrical converters and/or electric feed components and/or drives are arranged.

4 . The apparatus according to claim 2 , wherein for the central supply of electricity and water slip rings and a rotary water lead-through are provided above the platform and/or a communication cable is guided onto the platform as data line.

5 . The apparatus according to claim 1 , wherein above the platform observation systems, preferably cameras, are arranged at various positions.

6 . The apparatus according to claim 1 , wherein the rollers of the stretching line are driven and temperature-controlled individually and the rollers form at least one stretching nip, wherein the same advantageously is adjustable.

7 . The apparatus according to claim 1 , wherein the rollers of the stretching line have different diameters, and the stretching rollers have a comparatively smaller diameter.

8 . The apparatus according to claim 1 , wherein the rollers of the stretching line have a non-stick coating.

9 . The apparatus according to claim 1 , wherein the rollers of the stretching line are designed such that by the advance of at least one roller, a stretching force of 100 N to 1000 N can be applied.

10 . The apparatus according to claim 1 , wherein for tempering the rollers of the stretching unit, at least two temperature control circuits, namely a heating circuit and a cooling circuit, are present.

11 . The apparatus according to claim 1 , wherein the temperature-controlled rollers, the blown film guided through the stretching unit is heated up to a temperature which lies at least 10° C. below the glass temperature of the tubular film material.

12 . The apparatus according to claim 1 , wherein the temperature-controlled rollers have a temperature uniformity of <5° C., preferably <1° C., across the roller width.

13 . The apparatus according to claim 1 , wherein nip rollers are provided in the stretching unit, which preferably have a surface quality other than the nipped rollers.

14 . The apparatus according to claim 1 , wherein between driving and braking rollers in the stretching unit an intermediate circuit coupling, preferably an electric coupling, is provided for saving energy.

15 . The apparatus according to claim 1 , wherein instead of the reversing device downstream of the stretching unit, the annealing rollers of the stretching device are formed to be reversing.

16 . The apparatus according to claim 3 , wherein for the central supply of electricity and water slip rings and a rotary water lead-through are provided above the platform and/or a communication cable is guided onto the platform as data line.

17 . The apparatus according to claim 16 , wherein above the platform observation systems, preferably cameras, are arranged at various positions.

18 . The apparatus according to claim 4 , wherein above the platform observation systems, preferably cameras, are arranged at various positions.

19 . The apparatus according to claim 3 , wherein above the platform observation systems, preferably cameras, are arranged at various positions.

20 . The apparatus according to claim 2 , wherein above the platform observation systems, preferably cameras, are arranged at various positions.

Assignees

• Windmoeller & Hoelscher

Inventors

• Backmann Martin
• Bussmann Markus
• Golubski Karsten

Classifications

• B29C48/10

  flexible, e.g. blown foils · CPC title

• B29C48/92

  Measuring, controlling or regulating · CPC title

• B29C55/06

  parallel with the direction of feed · CPC title

• B29C2948/92647

  Thickness · CPC title

• B29C48/0018 Primary

  combined with shaping by orienting, stretching or shrinking, e.g. film blowing (B29C48/0017 takes precedence) · CPC title