Rolling apparatus for plastic film

Details Rolling apparatus for plastic film Rolling apparatus for plastic film

1997-08-05

2000-04-04

Mackey, James P.

Plastic article or earthenware shaping or treating: apparatus

Sets of shaping couples comprising an endless surface for...

425363, 425367, B29C 4346

Patent

active

060453494

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1 . Field of the Invention
This invention relates to a rolling apparatus for a plastic film. More particularly, the invention relates to an improved rolling apparatus in which various deficiencies in a high ratio of rolling operation with conventional apparatus have been eliminated to produce plastics films of excellent quality without generating wrinkles or the like with high productivity.
2. Discussion of the Prior Art
As described, for example, in Japanese Utility Model Laid-open Publication No. 52-135465, the rolling of a plastics film is the process in which a plastic film is passed through a pair of rolls to be reduced in thickness under pressure. The rolling action is substantially caused to occur at the deformation point at which the pair of rolls are brought into contact and which point extends in the longitudinal direction of the rolls.
The above-mentioned gazette discloses that when the peripheral speeds of a pair of rolls are made different and a plastic film is fed between the rolls so as to bring the film into contact with the surface of a lower speed roll, reliable rolling action can be done at the deformation point, the rolling ratio is improved and the occurrence of wrinkles or waving of the plastic film can be avoided.
In order to carry out the rolling at a high rolling ratio with a conventional rolling apparatus, however, it is necessary to impart high pressing force to the pressure rolls, thereby causing the following problems. That is, the bursting of plastic films to be rolled is liable to occur due to the applied high pressure, the deflection of rolls is bring about due to the deformation resistance of a plastic film, and wrinkles or folds in the film is caused to occur due to the difficulty in the feeding of plastic film into the deformation point.
It is, therefore, the object of the present invention to provide a rolling apparatus for a plastic film which is capable of producing a quality plastic film with high productivity.


BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a front view of an embodiment of a rolling apparatus for a plastic film in the present invention;
FIG. 2 is an enlarged front view of a part of the rolling unit of the apparatus shown in FIG. 1;
FIG. 3 is an enlarged front view of pressure rolls in according with the present invention;
FIG. 4 is a front view of a first modification of the pressure rolls shown in FIG. 3;
FIG. 5 is a front view of a second modification of the pressure rolls shown in FIG. 3;
FIG. 6 is a front view of a third modification of the roll shown in FIG. 3;
FIG. 7 is a front view of another embodiment of pressure rolls of the rolling apparatus for a plastic film in accordance with the present invention; and
FIG. 8 is a front view of a modification of the pressure roll shown in FIG. 7.


SUMMARY OF THE INVENTION

The rolling apparatus for plastic film in the present invention is characterized in that at least three pressure rolls are disposed along the passage of a plastic film. One deformation point is formed between two rolls out of the three rolls. Furthermore, the above at least three rolls form plural deformation points so as to roll the plastic film stepwise.
The above problems in the conventional rolling apparatus such as described above are caused to occur to carry out the rolling at a high rolling ratio by utilizing only one rolling deformation point. According to the present invention, the rolling is carried out by utilizing plural points of deformation which are formed along the passage of a plastic film. It is thus possible to achieve the rolling at a high rolling ratio as a overall process while conducting the rolling at a low rolling ratio in each roll deformation point. As a result, it is possible to carry out the rolling of a plastic film without generating wrinkle or the like together with to attain the high productivity.
In the above-described rolling apparatus of the invention, it is desirable that the rolling apparatus is provided with drive means to drive the above-mentioned at least three rolls, t

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