Widening process and apparatus for rolled plastic film and sheet

Abstract

The present invention relates to a process and facility for stretching plastic films and sheets by calendering. The stretching equipment in the known calendering method is horizontally arranged, and its disadvantage is that the projection surface of the horizontal plane is too large, due to the weight of plastic films and sheets The reason is that the horizontal width is too wide to sag and be vertically stretched by its own weight, so that the flatness of the plastic film and the sheet product is not good after being shaped, which limits the width of the finished product to be too wide. Wheels, guide wheels, widening equipment, clamping force tensioning system, tempering wheel and cooling wheel set, the widening equipment is changed from the original horizontal placement to the inclined placement, and the additional installation adopts the counterweight wheel With advanced clamping force tensioning system and adjustable guide wheels up and down, the improved stretching equipment can produce wide products with better flattening and width between 4200mm-16000mm.

Description

technical field

[0001] The invention relates to a stretching and widening process and equipment for plastic films, in particular to an on-line film and sheet widening process and device using a calendering method. Background technique

[0002] In the production process of plastic film and sheet, especially in the calendering method, the width of the widened product determines its application range. Therefore, the equipment for producing wide-width stretched film determines its plastic film. 1. The application field of thin film is wide, which puts forward higher requirements for the equipment itself, and also shows that it is difficult to produce wide-width film stretching equipment.

[0003] The currently known widening equipment of the calendering method is horizontally configured: the sequence is calender roll → drawing wheel leads to longitudinal stretching → widening equipment transverse stretching → warming wheel relieves cooling → cooling wheel group cooling and shapi...

Examples

Embodiment Construction

[0010] The present invention is described further in conjunction with embodiment and accompanying drawing:

[0011] This embodiment is a calendering widening device for producing 5500mm wide plastic film. It uses four groups of calendering wheels 1 to longitudinally calender and stretch the plastic film 2 when the width is 2000mm, and then passes through six groups of drawing wheels 3 in the horizontal direction. Repeated stretching, guided by the guide wheel 4 into the entrance A end of the stretching equipment 5 with an upward slope of β=40° and a length of 3500mm, the width of the A end is adjusted to 2000mm, and the two sides of the plastic film 2 are clamped in the stretching In the interlayer of the upper and lower V-belts wrapped around the upper and lower clamping wheels on both sides of the device 5, it is stretched wide during the forward stretching process until it reaches the B end of the widening device 5, and the width of the B end is adjusted to 5500mm, a clampi...

technical field

[0001] The invention relates to a stretching and widening process and equipment for plastic films, in particular to an on-line film and sheet widening process and device using a calendering method. Background technique

[0002] In the production process of plastic film and sheet, especially in the calendering method, the width of the widened product determines its application range. Therefore, the equipment for producing wide-width stretched film determines its plastic film. 1. The application field of thin film is wide, which puts forward higher requirements for the equipment itself, and also shows that it is difficult to produce wide-width film stretching equipment.

[0003] The currently known widening equipment of the calendering method is horizontally configured: the sequence is calender roll → drawing wheel leads to longitudinal stretching → widening equipment transverse stretching → warming wheel relieves cooling → cooling wheel group cooling and shapi...

Examples

Embodiment Construction

[0010] The present invention is described further in conjunction with embodiment and accompanying drawing:

[0011] This embodiment is a calendering widening device for producing 5500mm wide plastic film. It uses four groups of calendering wheels 1 to longitudinally calender and stretch the plastic film 2 when the width is 2000mm, and then passes through six groups of drawing wheels 3 in the horizontal direction. Repeated stretching, guided by the guide wheel 4 into the entrance A end of the stretching equipment 5 with an upward slope of β=40° and a length of 3500mm, the width of the A end is adjusted to 2000mm, and the two sides of the plastic film 2 are clamped in the stretching In the interlayer of the upper and lower V-belts wrapped around the upper and lower clamping wheels on both sides of the device 5, it is stretched wide during the forward stretching process until it reaches the B end of the widening device 5, and the width of the B end is adjusted to 5500mm, a clampi...

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