CN1026312C

CN1026312C - Antistatic roll for use in film production facilities

Info

Publication number: CN1026312C
Application number: CN92100575A
Authority: CN
Inventors: 高熙荣
Original assignee: SKC Co Ltd
Current assignee: SKC Co Ltd
Priority date: 1991-05-15
Filing date: 1992-02-25
Publication date: 1994-10-26
Anticipated expiration: 2007-02-25
Also published as: CN1066827A; KR940005459Y1; KR920021144U; JPH05200932A; JP2664582B2

Abstract

An antistatic roll is provided for use in transferring and/or winding a continuous sheet of polymeric film. The roll comprises a cylindrical core made of an electrically conductive material. A layer of dielectric material surrounds the core, which has a spiral groove formed on the outer circumference thereof at a substantially equal pitch. An elongate conductor is held within and extends along the spiral groove to gather static electricity from the roll and/or the polymeric film. Associated with the elongate conductor is a grounding arrangement to drain off the static electricity gathered therein.

Description

Antistatic roll for use in film Production facilities

The present invention relates to a kind ofly be used to transmit or the roller of the thin polymer film of the certain-length of reeling, can remove antistatic roller on the roller and that twist in the static charge device on the thin polymer film on the roller particularly a kind of having.

Utilizing various different roller is known with the transmission or this technology of thin polymer film continuous, that be made of materials such as polyethylene terephthalate, polyvinylchloride, polypropylene, polyethylene or acid amides of reeling.These existing rollers can be divided into conduction roller class and combination roller class, and the roller class of wherein conducting electricity is made by conductive material fully, and combination roller class then includes a conductive core and a dielectric layer that wraps on this core body.When thin polymer film is reeled by these rollers or transmitted, often produce the static charge of some owing to the friction between the roller of film that moves and rotation.As a rule, these static charges are always tended to hold dust in the atmosphere and other particulate and are caused the poor quality of film.

Although, only can remove static or static charge with roller self ground connection for the conduction roller,, this mode is not suitable for existing combination roller.Specifically, be not enough owing to having a non-conductive layer on the combination roller, only allow the core body ground connection of conducting electricity for the static of removing on its skin and the thin polymer film.

The method that is used to remove static charge traditionally be on position, assemble a separation again near the combination roller and also be electric installation independently, still, because the restriction in structure and space, this electric installation has been proved to be only has limited effect.Another method is to add a kind of chemical agent to reach last antistatic effect on thin polymer film.It is far from being enough that but this method also has been found for reaching a desirable static level of going.And the physical property of using this chemical agent can have influence on thin polymer film on the contrary causes the quality of polymer film to descend.Also having a kind of method to propose to use is with filametntary antistatic medicament to remove to make thin polymer film, although having certain effect, this method make the thin polymer film of producing have certain static characteristic that draws, but it has such weakness, i.e. the use strictness of this method is limited on the thin polymer film of producing some type.

Therefore, this production field also need to seek a kind of from the combination roller that has static and/or thin polymer film get on to destatic the more efficient methods of lotus.

Therefore, purpose of the present invention just provides a kind of improved antistatic combination roller, and this roller has fundamentally overcome the shortcoming of existing roller, and can remove static charge on various types of combination rollers and/or the thin polymer film in mode effectively.

The present invention proposes a kind of so antistatic roller that is specifically designed to transmission and coiling continuous polymer film, and described roller includes:

A column core of making by conductive material, described column core has a pair of rotating rotating shaft, and wherein each root rotating shaft is stretched out from the opposite end of described column core vertically;

One deck is enclosed within non-conductive layer on the described column core by what non-conducting material constituted, has the plug helix that in fact pitch equate on the side face of described non-conductive layer;

A long conductor is arranged in described plug helix, and is positioned on the described roller and/or the static charge on the described thin polymer film along described plug helix extension with collection;

Be used to make described long conductor connected to chassis earth system, this device is used to derive the static charge of amassing on described long conductor;

And described roller can also include a plurality of conductive pins, and described conductive pin is fixed on the described long conductor and is evenly spaced apart along described long conductor, and wherein the described conductive pin of each root is all along the radially extension of described roller;

And described earth system includes the end of described long conductor, a conductive bearing and a lead that is used for providing electrical connection between the earth and described bearing that is used for supporting rotationally described roller, and described bearing and described end are kept in touch.

The present invention also proposes a kind of antistatic roller that is specifically designed to transmission and coiling continuous polymer film, and described roller includes:

A column core of making by conductive material, described column core has a pair of rotating rotating shaft, and wherein each root rotating shaft is stretched from the opposite end of described column core vertically;

One deck is enclosed within non-conductive layer on the described column core by what non-conducting material constituted, on the side face of described non-conductive layer, have first in fact equal plug helix of pitch and second plug helix that interweaves with described first plug helix, because the interweaving of two grooves, be on the side face of described roller of island district formation of rhombus in a plurality of communications;

A pair of long conductor, wherein each root long conductor is arranged in described first guide groove or second guide groove, and is positioned on the described roller and/or the static charge on the described thin polymer film along its extension with collection;

And described roller can also include a plurality of conductive pins, and described conductive pin is fixed on the described long conductor and is evenly spaced apart along described long conductor, and wherein the described conductive pin of each root is all along the radially extension of described roller.

Antistatic roller structure proposed by the invention is simple, thereby and use roller of the present invention in process of production and the thin polymer film produced hardly static electrification just do not adsorb dust yet.

To be further described purpose of the present invention and characteristics with reference to the accompanying drawings below.Wherein:

Fig. 1 is the schematic perspective view according to an embodiment of antistatic combination roller of the present invention;

Fig. 2 is the cross-sectional schematic of A-A line among Fig. 1;

Fig. 3 is the cross-sectional schematic of B-B line among Fig. 1, and this figure at length shows and is positioned at along the long conductor of plug helix position and is fixed in radially conductive pin on the long conductor;

Fig. 4 is by the enlarged diagram of the part of C indication among Fig. 2;

Fig. 5 is the schematic perspective view according to another embodiment of antistatic roller of the present invention.

Shown in Fig. 1 to 4, combination roller 10 according to an embodiment of the invention comprises a column core 12 of being made by conductive material.Having the hollow of enough rigidity or solid metal cylinder can be as column core 12 with the backbone as roller 10.Having a countershaft 14 and this rotating shaft 14 on core 12 is technique known from axial protruding this setting in two opposite ends of roller 10 respectively.The non-conductive layer 16 that is made of for example rubber or silicon covers in other words on the side face of the column core 12 of conduction as the core retainer plate cover and makes the outer peripheral face of roller 10 become non-conductive outer peripheral face.In producing the process of film, thin polymer film transmits or is wound on the roller 10, and at this moment, non-conductive layer dielectric layer 16 in other words is used to guarantee frictional fit between roller 10 and the continuous thin polymer film (not shown).

Have plug helix 18 on the outer peripheral face of non-conductive layer 16, this groove 18 is formed between two opposite ends of this conductive layer 16 vertically spirally.Although the pitch that is fit to depends on diameter and other factor of specific roller, the pitch of plug helix 18 still be the smaller the better with guarantee to remove to greatest extent appear on the thin polymer film and above-mentioned roller on static charge.Spiral fluted cross sectional shape shown in the figure is that U-shaped is to illustrate for example, and in the present invention, this cross sectional shape is hard-core, and other cross sectional shape also is fine.

Long conductor 20, for example metal wool or bonding jumper are arranged in plug helix 18 and extend in the whole actual length of this groove.Shown in Fig. 1 was clear, at an end of roller 10, the part of long conductor 20 was stretched out plug helix 18 and final and moving contact 21 joins.As we can see from the figure, the pair of metal bearing for example conducts electricity oilless metal, is supporting the rotating shaft 14 of roller 10 rotationally.One of them bearing 22 cooperates with moving contact 21 as fixed contact, for the conducting between long conductor 20 and the bearing 22 that touched provides path.

Even contact in order also to guarantee that moving contact 21 is remained valid with the bearing that is touched when the rotation of roller 10, perhaps the side that moving contact 21 flexibly is pressed in the bearing 22 that is touched is necessary.Such bearing 22 is very important by a lead 24 or other suitable conductor ground connection.Moving contact 21, the bearing 22 that is touched and lead can constitute a single unit system, to be used to making long conductor 20 ground connection emit the static charge that is positioned on roller 10 and/or the thin polymer film in other words to derive.In addition, if desired, above-mentioned earth system also can be arranged on the other end of roller 10.

Shown in Fig. 3 and 4, roll and to attach a plurality of be fixed on the long conductor 20 and on 10 along long conductor 20 even conductive pin 26 spaced apart basically.Wherein each root conductive pin 20 is along the extending radially outwardly of described roller 10, so that collect the static charge that the friction owing to roller 10 and thin polymer film produces effectively.The radially extension of these conductive pins does not allow to exceed the perimeter surface of roller 10, and otherwise, the conductive pin 26 that stretches out can become a factor of damage thin polymer film.In order to produce antistatic roller 10 with a kind of mode of production easily, be preferably in long conductor 20 is put into before the plug helix 18, earlier conductive pin 26 is secured on this long conductor 20.The antistatic roller of the above-mentioned type has the ability that derives all static charges, thus make the production special quality, not with or the thin polymer film that has static charge hardly become possibility.

Referring to Fig. 5, the figure shows a further follow-on embodiment according to antistatic roller of the present invention.The effect of this roller 30 is similar to the effect of the roller shown in Fig. 1 to 4, but the form of their grooves to each other is different.Therefore, use among Fig. 5 with above-mentioned figure in identical label indicated parts similar to the aforementioned embodiment.In detail, improved type roller 30 includes a non-conductive layer 16, on this non-conductive layer 16, has the first plug helix 18a and the second plug helix 18b, this two plug helix intersects each other and knits, and has formed a plurality of island districts 32 that are roughly rhombus thus on the side face of roller 30.

Same, the first long conductor 20a and the second long conductor 20b are entangled in respectively among plug helix 18a and the 18b, and along the groove extension at place separately, to be used for being collected in the static charge that thin polymer film transmits and/or winding process produces.Long conductor 20a touches at its place of intersecting each other mutually with 20b, like this, between this two long conductor electric pathway has just been arranged.Because the roller shown in Fig. 5 is except above-mentioned special character, with regard to removing static charge principle and other constructional feature, tool is identical with Fig. 1 to the roller shown in Fig. 4, therefore will no longer be further described in these areas.Roller among Fig. 5 also uses long conductor connected to chassis earth system, and a plurality of conductive pin also can with basically uniformly fixed interval be connected on the long conductor, these have also done sufficient description.

Although the present invention is described above and shows according to embodiment,, concerning the people that this area is familiar with, under the situation of institute's restricted portion that does not break away from claim of the present invention and purport, many improvement and variation are obviously for those.

Claims

1, a kind ofly be used to transmit and the antistatic roller of the continuous polymer film of reeling, described roller includes:

A column core of making by conductive material, described column core has a pair of rotating rotating shaft, and wherein each root rotating shaft is stretched out from the opposite end of described column core vertically, it is characterized in that described roller also includes:

One deck is enclosed within non-conductive layer on the described column core by what non-conducting material constituted, has at least one plug helix that in fact pitch equate on the side face of described non-conductive layer;

At least one long conductor is arranged in described plug helix, and along described plug helix extend with collection be positioned on the described roller and described thin polymer film on static charge;

Be used to make described long conductor ground connection to derive the earth system that amasss the static charge on described long conductor.

2, a kind of roller as claimed in claim 1, it is characterized in that, described roller also includes a plurality of conductive pins, and described conductive pin is fixed on the described long conductor and is evenly spaced apart along described long conductor, and wherein the described conductive pin of each root is all along the radially extension of described roller.

3, a kind of roller as claimed in claim 1, it is characterized in that, described earth system includes the end of described long conductor, a conductive bearing and a lead that is used for providing electrical connection between the earth and described bearing that is used for supporting rotationally described roller, and described bearing and described end are kept in touch.

4, a kind of roller as claimed in claim 1, it is characterized in that, first groove that described plug helix includes on the side face that is positioned at described roller and in fact pitch equate and second groove that interweaves with described first groove, because interweaving of two grooves is on the side face of the described roller that a plurality of island districts that are actually rhombus form;

Described long conductor comprises pair of conductors, and wherein each root long conductor is arranged in described first guide groove or second guide groove, and along its extend with collection be positioned on the described roller and described thin polymer film on static charge.

5, a kind of roller as claimed in claim 4, it is characterized in that, described roller also includes a plurality of conductive pins, described conductive pin be fixed in described long conductor to last and along described long conductor to evenly spaced apart, wherein the described conductive pin of each root is all along the radially extension of described roller.