JPS5846352A - Electrostatically holding sheet and its manufacture - Google Patents

Abstract

PURPOSE:To give a sheet for holding a heat sensitive recording paper by electrostatic attraction, durability resistant to deformation due to heated pens, etc, by using a polymer contg. a conductive material, made unsoftenable by heat through cross-linking reaction, and having a specified volume resistivity for the adsorption layer of said sheet. CONSTITUTION:Plural conductors 10, 12 are alternately buried apart from each other in the one face of an insulating sheet 14 of a rigid polyvinyl chloride sheet or the like, and connected to each other as shown in dotted lines to form 2 groups of electrodes. A mixture of a synthetic rubber such as acrylonitrile- butadiene rubber, a conductive material such as carbon black, and a cross-linking agent is placed on the side of the electrode groups of the sheet 14, and heat pressed to form an electrostatic attraction layer 16 made non-heat-softenable and having 10<8>-10<12> ohm.cm volume resistivity. The obtained electrostatically holding sheet causes no ruggedness or deformation even when recording on the recording paper on the layer 16 with heated pens or a usual ink type pen is repeated, and can be used repeatedly.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrostatic holding seed used in an electrostatic holding device and a method for manufacturing the same.

The electrostatic holding device is known from the publication No. 1192 of Jitsugoku Shoj San-4!, and the material used as the adsorption layer of the electrostatic holding sheet of the electrostatic holding device is as follows. 411 Kimiaki! -101
Plastic sheets shown in Publication No. 30 are known.゛This glass sheet has equivalent properties that can exhibit sufficient electrostatic adsorption force even if it has a sufficient thickness as a protective layer.

However, in recent years, it has become very popular to set thermal recording paper as an adsorbent in an electrostatic holding device and use a thermal pen to draw a single color or a single color on it! It is carried out in the Brass Kei and Drafting Equipment Village. This thermal pen has a lead diameter of 0. / to 0.3
vm te hot core mHmt t socc~j,!
t Occ. However, since the conventional glass sheet as described above that constitutes the adsorption layer is thermoplastic, when localized heating is applied using a hot pen, the pressure of the cage and the resulting heat are transferred through the thermosensitive paper. It is transmitted to the uniform adsorption layer, and its surface undergoes thermal deformation, leaving chain marks. As a result, during long-term use, Table 11 develops fine irregularities, causing distortions where straight lines should be drawn, resulting in the disadvantage that it cannot be used repeatedly.

Therefore, it is an object of the present invention to provide an electrostatic holding sheet having an adsorption layer that does not undergo thermal deformation even when subjected to heat in, and a method for manufacturing the same.

According to the present invention, the electrostatic holding film. One is an insulating layer,
It consists of a group of electrodes on an insulating layer arranged alternately and separated from each other, and an adsorption layer placed on the insulating layer to cover these electrode groups, and the adsorption layer is made of a conductive material. It is composed of a polymeric material which is contained as an additive and is treated with a cross-linking reaction to have a non-thermal softening property and has a volume resistivity of t o 1 to lθ Ω.

Since the adsorption layer is non-thermosoftening, it does not undergo thermal deformation even when exposed to a thermal pen, and can be used for long periods of time regardless of whether it is a thermal pen or a regular ink pen. Furthermore, the volume resistivity is IO to l01! Ω, so it can exert sufficient electrostatic adsorption force even if it has a sufficient thickness as a protective layer, similar to the glass sheet for electrostatic holding devices shown in the patent publication mentioned above. .

In the present invention, the polymeric material is an auxiliary agent and a lubricant.

It may contain a stabilizer and a plasticizer, and may also be a synthetic resin or a thermosetting synthetic resin. Furthermore, in one embodiment of the present invention, hydryl butadiene is used as the synthetic material, and carbon black is used as the conductive material.
Then, a vulcanizing agent is added and a crosslinking reaction is performed by heat treatment to make the material non-thermosoftening. In addition, when using thermosetting synthetic resin,
・According to the method for producing an electrostatic holding sheet according to the present invention, an insulating material sheet is prepared on one surface of which are placed electrode groups spaced apart and arranged alternately, and a conductive material sheet is prepared. A thermosetting polymeric material containing a thermosetting material as an additive is uniformly mixed and formed into a sheet, and the polymeric material sheet is stacked on one side of an insulating material sheet and pressurized, and at the same time heated. The polymeric material sheet is cured using the insulating material sheet, and the polymeric material sheet is crimped and integrated with the insulating material sheet, and the electrostatic holding sheet is manufactured by making it non-thermal softenable. An electrostatic holding sheet in which a heat-softening adsorption layer is integrated with an insulating layer is obtained.

In the present invention, the thermosetting polymeric material is.

It may be a thermosetting synthetic resin, or it may be made by uniformly heating and kneading it with a synthetic conductive material and then quickly mixing a vulcanizing agent into it. In this case, it can be quickly shaped into a sheet to prevent the crosslinking reaction from proceeding. In one embodiment according to the present invention, the conductive material is carbon black and the heating temperature is /30 oc to /40 oc- T: Al.

A specific example of an electrostatic holding sheet according to the present invention will be described below.

The materials listed in A of the table above are mixed with a kneader or other means.
After heating and kneading, the materials listed in the BK journal are quickly mixed in, homogeneously mixed, and rolled into a paper using rolls, etc., to form O, S.
- Formed into a thick sheet material and cooled to room temperature (COOOC)
before and after) was maintained below. The purpose of keeping the temperature below room temperature is to prevent the crosslinking reaction caused by the vulcanizing agent from proceeding.

Then, as shown in the attached drawing, a thickness of O0 is applied on one surface.
! A hard 4-sided polyvinyl chloride board 14 with a thickness of d, on which conductors lO and lla of the group - are buried alternately and spaced apart from each other.
9 sheets of material 16 that have already been dosed are stacked and pressed on top of the
At this time, the temperature was heated from /30 oc to 140 oc and maintained for a sufficient time for the crosslinking reaction, and then cooled. In addition,
The conductors IO and III are connected to each other as shown by dotted lines to form a detailed electrode group.

Example/Using the Jiuseiden holding sheet made by
When a direct current of 0V was applied between the electrodes in a warm and humid environment of 63 tatami mats, the adsorption force was 2S, and 1/aN. This is a suction force sufficient to hold paper, etc.

And the volume resistivity is.

Measured using Rodenki's vg-san〇, 3~bX
The scratch was 10''Ω.The surface hardness was measured using a ♂mu hardness meter manufactured by Kobunshi Keiki Co., Ltd., and it was found to be a purple hardness of 7 g.

It should be noted that those skilled in the art will understand that synthetic resins may be mixed. Instead of the synthetic F5 containing a conductive material and a vulcanizing agent, a thermosetting material with a conductive material added is kneaded and formed into a sheet, which is then stacked on an insulating material plate on which an electrode group is arranged. Even if they are bonded together under pressure and heat to cause a crosslinking reaction, the same K11Ii1 resistance lO
An electrostatic retentive sheet having a non-thermosoftening adsorption layer with 1 to 16120 flaws can be made.

As is clear from the above results, the electrostatic holding sheet of the present invention has a non-thermal softening property because the adsorption layer is subjected to a cross-linking reaction treatment, and does not undergo thermal deformation even when subjected to heat from heat-in. ,
Furthermore, even if the protective layer O0S■ has a sufficient thickness, sufficient adsorption force can be exerted. Furthermore,
Due to its moderate hardness, it can be used for long periods with both thermal pens and regular ink pens without getting scratches or marks.

[Brief explanation of the drawing]

The attached drawing is a cross-sectional view of the electrostatic holding sheet. 10, 1B... Conductor, l4...
...Insulating layer, 16...Adsorption layer)^

Claims (1)

[Claims] (Yi) An insulating layer, a group of electrodes on the insulating layer arranged alternately and spaced apart from each other, and an adsorption layer placed on the insulating layer so as to cover the electrode groups. Tokarana 9, its adsorption layer is
A volume resistivity of 10m to 1012Ω that contains a conductive material as an additive and is cross-linked and has non-thermal softening properties.
(2) The electrostatic holding sheet according to claim 1, wherein the polymeric material further contains an auxiliary agent, a lubricant, a stabilizer, and a plasticizer. holding sheet. (3) The electrostatic holding sheet according to claim 1 or 1, wherein the polymer material is a synthetic material. (4) the synthetic fm is nitrile butadiene dim;
The electrostatic holding sheet according to claim fIXJ, wherein the conductive material is carbon black. (Gloss) The electrostatic holding seed according to claim 3 or the top of the claim, wherein the polymeric material contains a vulcanizing agent and is made non-thermosoftening by crosslinking reaction treatment by heat treatment. 6) The polymeric material is a thermosetting synthetic resin.Claim 7, which is crosslinked by heat treatment and made non-thermosoftening TL/C: according to claim 1. Electrostatic holding sheet. (7) Prepare an insulating material sheet on one surface of which a group of electrodes arranged alternately at a distance of KM, and a thermosetting material containing a conductive material as an additive. The polymer material is uniformly mixed and formed into a sheet F shape, the polymer material sheet is stacked on one side of the insulating material sheet and pressurized, and the polymer material is cured by heating at that time, A method for manufacturing an electrostatic holding sheet that is non-thermo-softening and that composes and integrates a polymer material sheet with an insulating material seed. (8) A patent claim in which the thermosetting polymer material is a thermosetting synthetic resin. Scope of the manufacturing method of the electrostatic holding sheet according to item 7 (9) The thermosetting polymer material is a synthetic DEM, and after uniformly heating and kneading it with the conductive material, a vulcanizing agent is quickly mixed in. A method for producing an electrostatic holding sheet according to Claim s@Claim 7, in which the electrostatic holding sheet is formed into a sheet shape by heating.Trout Synthesis fA is nitrile butadienedimium.Claim 9, wherein the heating temperature is /30oc to 14ooc. A method for producing an electrostatic holding sheet as described in .