JP2008263033A - Spacer for roll to roll process - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a spacer for roll to roll process which can manufacture an extremely thin strip type flake laminated board. <P>SOLUTION: Volatile matter is removed by heat-treatment in the state that the strip type flake laminated board is rolled up. The surface of the spacer for roll to roll process is made to be a smooth surface (Rz value<1 mm), a roughening portion protruding from the surface of an opposite plane is installed respectively in the side along the two long sides of the surface of the opposite plane. When the strip type flake laminated board is rolled up, the roll to roll process is performed together with the spacer for roll to roll process, the volatile matter contained in the rolled up strip type flake laminated board is made to be capable of being exhausted from a channel which is formed by the recessed portion in the roughening portion installed in the both sides of the spacer for roll to roll process in the process of the heat treatment. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method for removing a volatile substance in a volatile substance, and in particular, a volatile solvent and / or a gas by-product is removed during a roll-to-roll process of manufacturing a laminate for a flexible printed circuit board. The present invention relates to an apparatus and a method.

  A strip-type laminated sheet containing a known volatile solvent and a monomer is usually removed by heating and reducing pressure (for example, vacuum) by a method assisted by heating and reducing the volatile solvent contained therein, and the monomer. The polymer formation by the polymerization reaction is promoted. For example, in a manufacturing process of a copper foil laminated substrate for a flexible printed circuit board, a single polyamic acid (PAA) varnish composition containing a volatile solvent is coated on the surface of the copper foil. Thereafter, the volatile solvent used to dissolve the polyamic acid is removed by heating, and the polyamic acid is polymerized to form a polyimide (PI). In the above heat treatment process, according to the conventional technique, the film is dried by a roll-to-roll method. As described above, in the method of performing the heat treatment by passing through the heating furnace, the length of the heating furnace is directly proportional to the time required for the heat treatment, that is, the longer the heat treatment time, the longer the necessary heating furnace length. However, if the length of the heating furnace is shortened in order to save the cost of the equipment, the speed at which the strip-type strip-type laminated sheet passes through the heating furnace must be reduced to ensure sufficient heating time. Then, the problem that the production speed decreases occurs.

  For this reason, Patent Document 1 describes a method in which heat treatment is performed after the roll-to-roll process of the above-described strip-type piece-like laminate. This method does not use a roll-to-roll process spacer for removing volatile substances, which causes sticking problems between materials. In order to overcome the problem of adhesion between the materials, Patent Document 2 describes a method of heat-treating a nonwoven fabric or a stainless metal net having a surface roughness (Ra) of 0.5 μm or more as a spacer for a roll-to-roll process. Has been. However, in actual use, there may be a situation where the non-woven fiber remains, and the non-woven fabric or stainless steel metal net may leave a pressure mark (for example, net-like mark) on the treated material surface. Yield gets worse. In order to overcome this problem, Patent Document 3 describes a roll-to-roll process spacer 10 made of copper foil, which has a roughened surface in which a plurality of protrusions 12 are installed on the surface thereof, and is separately provided. The surface is made smooth (FIGS. 1-2). At the time of operation, the roll-to-roll process is performed by pressing the roughened surface of the roll-to-roll process spacer against the surface coated with the monomer of the strip-type piece-like laminate. During the heat treatment, the volatile solvent is vaporized and discharged from the gap between the protrusions. Such a method exempts residual nonwoven fibers and reduces the problem of pressure marks on the treated material surface, but cannot be completely prevented. In addition to this, the manufacturing cost of this roll-to-roll process spacer is greatly increased, and the holes on the roughened surface of the roll-to-roll process spacer are clogged with the remaining monomer, and used twice or three times. Must be discarded after this, which further increases processing costs.

  In order to solve the above-mentioned problem that pressure marks remain on the surface of the processed material in the known technique, two metal nets are not used as spacers for the roll-to-roll process on both sides of the strip-type piece laminate. A method of heat-treating after a roll-to-roll process of strip-shaped piece-like material has been submitted. The remaining portions of the compression marks on both sides of the strip-shaped piece-like material after the heat treatment are excised, thereby obtaining a product having no compression marks. However, this method has its drawbacks in actual operation. For example, a metal mesh band has a difference in tension and speed during operation of two metal mesh bands due to a frictional force generated when the wound metal mesh band is pulled out. The left and right sides of the material are subjected to different force pulls, and a wrinkle is formed in the strip-shaped piece material. In addition, when the metal strip is too thick, the strip-shaped piece material wound up is upright, the weight of the metal strip becomes too heavy, and the strip-type piece material cannot be supported. This causes the surface wrinkles and appearance damage. On the other hand, if it is too thin, the strip-shaped strip-shaped material wound up may be sticky, and the ratio of the length and width of the ventilation holes formed by the metal mesh band will be too large to allow hot air to enter. Thus, the desired action is lost, and the physical and chemical properties of the inner and outer layers of the wound strip-type flake material differ. This problem cannot be overcome even if the heat treatment is changed to the radiant heating method.

JP 61-307789 A JP-A-4-84488 JP-A-8-224797

  In order to solve the problems existing in the known art, the present invention provides a method for removing the volatile substance in the volatile substance-containing material by means of a roll-to-roll process spacer. Overcoming the problems of leaving undesired residues (eg fibers), compression marks on the surface of the strip-type flake material, and causing changes in the physical and chemical properties of the inner and outer layers of the product, such as uneven surface color distribution.

  In order to achieve the object of the present invention, the present invention provides a roll-to-roll process spacer for a volatile material, which is used to remove the volatile material in a strip-type strip-type strip laminate containing a volatile material. provide. The strip-type piece laminate is heat-treated after the roll-to-roll process to remove the volatile substances, and the surface of the roll-to-roll process spacer is made smooth, and the opposite surface is Roughening portions that protrude from the surfaces of the opposite surfaces are provided on the sides along the long side of both sides.

  In the step of winding the strip-type strip-shaped laminate, a roll-to-roll process is performed using the roll-to-roll process spacer of the present invention, and the volatile substance contained in the strip-type strip-shaped laminate is heated. In the course of the treatment, it is discharged through a channel formed by a recess in the roughened portion on both sides of the separator of the present invention.

The present invention also provides a method of manufacturing a laminate for a printed circuit board using a roll-to-roll process spacer. This method
(1) A step of obtaining a strip-shaped piece-like laminate including a substrate and a material layer formed on the substrate and containing a volatile substance,
(2) When removing the volatile material by winding and heat-treating the strip-type flake laminate, the roll-to-roll process using the roll-to-roll process spacer described above is used to roll Isolating the strip-type flake laminate, of which the surface on which the roughened portion of the roll-to-roll process spacer is placed is opposed to the material layer of the strip flake laminate,
(3) The wound strip-type laminate laminated with the roll-to-roll process spacer is heated with the roll-to-roll process spacer, and the volatile material is coarsened on both sides of the roll-to-roll process spacer. The step of discharging from the recess in the conversion part,
The above steps are included.

  The strip-type piece laminate material described in the present invention refers to a sheet-like material, and its length-width ratio> 10. The strip-type flake laminate described in the present invention refers to a composite material in which a plurality of strip-type flake laminate materials are superimposed.

  The invention is further illustrated by the following detailed description and examples, which do not limit the content presented by the invention. Details and modifications that can be made by those having ordinary skill in the art to which the present invention pertains based on the following examples shall not depart from the scope of the present invention.

The invention of claim 1 is a roll-to-roll process spacer, wherein the roll-to-roll process spacer is used to remove the volatile substance in a strip-type piece-like laminate containing a volatile substance, When the strip-type piece laminate is wound up and heat-treated to remove the volatile material, the roll-to-roll process spacer is used in a roll-to-roll process, and the surface of the roll-to-roll process spacer is A roll-to-roll, characterized in that a roughened portion that is a smooth surface and that protrudes from the surface of the back surface is provided on each of the sides along the long sides of the surface of the back surface. It is a process spacer.
The roll-to-roll process spacer according to claim 1, wherein the roughened portion is fixed onto the surface of the roll-to-roll process spacer. It is a spacer.
According to a third aspect of the present invention, there is provided a roll-to-roll process spacer according to the second aspect, wherein the roughened portion has a structure having a continuous recess design.
According to a fourth aspect of the present invention, there is provided a roll-to-roll process spacer according to the third aspect, wherein the roughened portion is composed of a plurality of columnar bodies protruding from a plane. Yes.
The roll-to-roll process spacer according to claim 5 is the roll-to-roll process spacer according to claim 1, wherein the roughened portion is separably installed on the surface of the roll-to-roll process spacer. It is a roll process spacer.
The invention according to claim 6 is the roll-to-roll process spacer according to claim 5, wherein the roughened portion has a belt-like structure with a continuous recess design. .
A seventh aspect of the present invention is the roll-to-roll process spacer according to the sixth aspect, wherein the belt-like structure is a metal net.
The invention according to claim 8 is the roll-to-roll process spacer according to claim 1, wherein the total thickness of the roll-to-roll process spacer plus the strip-type laminar laminate is between 30 and 3000 μm. This is a roll-to-roll process spacer for a roll-to-roll process.
The invention according to claim 9 is the roll-to-roll process spacer according to claim 1, wherein the roll-to-roll process spacer has a smooth surface including the volatile material of the strip-type piece laminate in the roll-to-roll process. The surface on which the roughened portion of the spacer for the roll-to-roll process is installed is bonded to another side having a volatile substance in the strip-type piece laminate. , A roll-to-roll process spacer.
According to a tenth aspect of the present invention, in the roll-to-roll process spacer according to the first aspect, a height at which the roughened portion protrudes from a surface of the roll-to-roll process spacer is 15 to 1000 μm. The spacer for a roll-to-roll process is characterized by the above.
The invention of claim 11 is characterized in that, in the roll-to-roll process spacer according to claim 1, the average roughened portion depth (Rz value) of the smooth surface is 1 mm or less. The spacer is for a roll-to-roll process.
Invention of Claim 12 in the method of manufacturing the laminated board for printed circuit boards using the spacer for roll-to-roll processes,
(1) A step of obtaining a strip-type piece-like laminate including a substrate and a material layer formed on the substrate and containing a volatile substance,
(2) When removing the volatile material by winding and heat-treating the strip-type flake laminate, the roll-to-roll process using the roll-to-roll process spacer described above is used to roll Isolating the strip-type flake laminate, of which the surface on which the roughened portion of the roll-to-roll process spacer is placed is opposed to the material layer of the strip flake laminate,
(3) The wound strip-type laminate laminated with the roll-to-roll process spacer is heated with the roll-to-roll process spacer, and the volatile material is coarsened on both sides of the roll-to-roll process spacer. The step of discharging from the recess in the conversion part,
It is a method for producing a laminate for a printed circuit board using a roll-to-roll process spacer for roll-to-roll process, characterized by including the above steps.

  According to the present invention, the roll-to-roll process spacer can effectively prevent the occurrence of wrinkles in the strip-type piece laminate due to the uneven tension on both sides of the well-known roll-to-roll process spacer. In addition, when a material having thermal conductivity is used for the spacer for the roll-to-roll process of the present invention, the cross-sectional area of the thermal conduction increases (the thickness obtained by adding the spacer for the roll-to-roll process to the strip-type piece laminate). ), Thereby obtaining a good heat conduction effect, and therefore, the temperature difference between the outer layers of the strip-shaped piece-shaped laminated sheet wound up is not excessive, so that the strip wound up by the well-known heat treatment can be obtained. A difference in physical and chemical properties of the product due to an excessive temperature difference formed in the outer layer of the mold strip type piece-like laminate can be prevented. In addition, the spacer for the roll-to-roll process of the present invention effectively increases the supporting force of the strip-type piece laminate laminated effectively, and the weight of the upper part when the wound strip-type piece laminate is upright. Does not cause collapse due to being too heavy. Therefore, when the roll-to-roll process is performed using the roll-to-roll process spacer of the present invention, an extremely thin strip-type piece laminate can be produced.

  3 to 4 are display diagrams of the spacer for the roll-to-roll process of the present invention. Using the roll-to-roll process spacer 20 for removing a volatile substance in the strip-type piece laminate of the present invention, the strip-type piece laminate is heat-treated in a wound state, and the volatile substance is removed. Is removed. Among them, the roll-to-roll process spacer 20 includes a support plate 22, and the first surface 24 of the support plate 22 is essentially a smooth surface exhibiting a smooth surface. On the second surface 26 facing away from the first surface 24, a roughened portion 28 protruding from the second surface 26 is provided on each side along both long sides thereof. If necessary, the roughened portion 28 is fixed on the second surface 26 of the roll-to-roll process spacer 20 in advance, or is separable on the second surface 26 of the roll-to-roll process spacer 20. There is no particular limitation in the present invention. However, in consideration of cost performance and component exchangeability, the roughened portion 28 is preferably installed on the second surface 26 of the roll-to-roll process spacer 20 in a separable manner.

  When the roughened portion 28 is fixed onto the second surface 26 of the roll-to-roll process spacer 20 as required, the roughened portion 28 in the present invention is structured to have a continuous recess design, Arbitrary well-known structure that does not affect the flow of volatile gas, and is a structure that can discharge volatile substances that volatilize by heating from the side surface of a strip-type piece laminate laminated through a gap of a continuous recess design If it is, it can be applied to the present invention without any particular limitation. In the case of a structure having the above-described continuous recess design, for example, various columnar bodies protruding from a plane, this columnar body can be a cylinder, an elliptical column, a horseshoe column, a square column, a trapezoidal column, etc. It is not limited to. Various shapes protruding from the plane can be formed by a well-known machine or chemical cutting or etching method, and there is no particular limitation in the present invention.

  When the roughened portion 28 is detachably installed on the second surface 26 of the roll-to-roll process spacer 20, the roughened portion 28 in the present invention is a belt-like structure having a continuous recess design, for example, a mesh. Although it refers to a belt, it is not limited to this. An example of the above-described net band is, for example, a metal net band, but is not limited thereto. The height of the roughened portion 28 protruding from the surface of the support plate 22 is not particularly limited in the present invention, but any material can be used in the present invention as long as gas can be discharged through the concave portion installed therein. However, the height is preferably between 15 and 1000 μm.

  The material of the support plate 22 and the roughened portion 28 in the above-described roll-to-roll process spacer 20 may be the same or different. Any of them can be applied to the present invention as long as it can withstand the temperature of the heat treatment described above. In consideration of the heat conduction effect and the support effect of the wound strip-type piece laminate, the support plate 22 is made of a metal foil such as copper, aluminum or stainless steel, or a laminate containing these metal foils. Is good. In order to provide a good support effect, the thickness of the support plate 22 is not particularly limited in the present invention. However, the thickness of the support plate 22 plus the thickness of the strip-type piece laminate is 30. It suffices to be within -3000 μm. As a result, the present invention can be applied to the manufacture of an ultra-thin strip-type piece laminate (for example, a 9 μm thick copper foil laminate).

  The spacer for roll-to-roll process of the present invention can be applied to the range of strip-type strip-like laminates, and is a strip of erosion-resistant metal foil having a resin film that has heat resistance and requires removal of volatile components at high temperatures. Any mold-like laminate can be applied to remove volatile substances in the resin film with the roll-to-roll process spacer of the present invention. Examples of the strip-type piece laminate in the present invention include laminates of metal foil such as copper, aluminum, etc. of resin films such as polyethylene, polypropylene, polyester, polyamide, polyimide, and polystyrene. It is not limited.

  The smooth surface of the roll-to-roll process spacer of the present invention is a flat surface having a substantially smooth surface, and even if there is a slight unevenness, it does not affect the implementation of the present invention. It is assumed that it is within the range of the so-called smooth surface. The aforementioned smooth surface particularly refers to a surface having an average roughening depth (Rz value) of 1 mm or less. The recesses on the roughened portion of the spacer for roll-to-roll process of the present invention can be non-uniform in size and can be non-uniformly distributed, just discharged through the recess after heating and vaporization of volatile substances. If it does not affect the processing, it is within the range covered by the so-called roughening portion of the present invention.

  Further, the strip-type piece-like laminate including the volatile substance described in the present invention can be a strip-type piece-like laminate obtained by laminating a single material on a metal foil plate, and a plurality of different materials. Can be formed as a two or more strip-type piece laminate laminated on a metal foil plate. In the example in which the copper foil is the metal foil of the strip-type piece laminate in the present invention, the adhesive material of the polyimide precursor resin solution is coated thereon, and further the photosensitive resin solution is coated thereon.

  The spacer for roll-to-roll process of the present invention can be used for the production of a printed circuit board substrate, and the printed circuit board substrate is a conductor layer made of a metal such as copper foil, and a polyimide precursor coated thereon. An insulating layer of a resin solution such as a resin is provided. After pre-drying, the substrate is subjected to a roll-to-roll process together with the spacer for a roll-to-roll process of the present invention, and is wound on one roll. During the roll-to-roll process, the smooth surface of the spacer for the roll-to-roll process of the present invention faces the conductor layer of the substrate, and the other surface faces the insulating layer. Thereby, when heat-processing after the roll-to-roll process with the spacer for roll-to-roll processes of this invention, the residual solvent contained in a polyimide precursor resin volatilizes and is removed by heat processing. The ring closure reaction proceeds simultaneously with heating, and the precursor is completely converted to polyimide. Condensed water and unreacted residual monomers (gaseous byproducts) generated by the reaction at this time are also removed by volatilization.

  The substance that volatilizes by heating is discharged from the inside of the wound substrate through the channels formed in the concave portions in the roughened portions on both sides of the roll-to-roll process spacer of the present invention. This prevents the volatile material from accumulating inside the wound substrate, thereby preventing the occurrence of contamination on the product surface. In addition, the smooth surface of the spacer for roll-to-roll process of the present invention is flatly adhered to the conductor layer of the substrate, thereby preventing the appearance of the product substrate from being defective. In addition, the roll-to-roll process spacer of the present invention can also increase the support cross-sectional area of the substrate, thereby increasing the support force when the substrate is upright. Further, the heat conduction cross-sectional area of the substrate is increased by the roll-to-roll process spacer of the present invention, and therefore the heat conduction efficiency can be effectively increased. As a result, the temperature difference between the inside and outside of the wound substrate can be reduced, and therefore the situation in which the physical and chemical properties of the inner and outer layer substrates formed due to the difference in heating temperature are different (for example, surface color distribution is not good). Uniformity) can be effectively prevented.

  In addition, when the smooth surface of the spacer for roll-to-roll process of the present invention is bonded to the conductor layer of the substrate, the force receiving sectional area of the substrate can be effectively increased. Therefore, when a known metal mesh strip is used as the roughened portion of the roll-to-roll process spacer of the present invention, even if the tension and speed of the metal mesh strip on both sides are not uniform, the effective receiving area of the substrate is reduced. Due to the increase, it becomes less sensitive to pulling different tensions on the metal mesh bands on both sides and therefore less likely to wrinkle.

It is a top view of a well-known roll-to-roll process spacer. It is sectional drawing of the A-A 'direction of FIG. It is a top view of the spacer for roll-to-roll processes of this invention. FIG. 4 is a cross-sectional view in the B-B ′ direction of FIG. 3.

Explanation of symbols

10 spacer for roll-to-roll process 12 protrusion 20 spacer for roll-to-roll process 22 support plate 24 first surface 26 second surface 28 roughened portion

Claims (12)

  In the roll-to-roll process spacer, the roll-to-roll process spacer is used to remove the volatile substance in the strip-type piece laminate containing the volatile substance. When the volatile material is removed by winding and heat treatment, the roll-to-roll process spacer is subjected to a roll-to-roll process, of which the surface of the roll-to-roll process spacer is a smooth surface. For the roll-to-roll process for roll-to-roll process, characterized in that a roughened portion protruding from the surface of the back-facing surface is installed on each side of the facing surface along the long side on both sides thereof Spacer.   2. The roll-to-roll process spacer according to claim 1, wherein the roughened portion is fixed on the surface of the roll-to-roll process spacer.   The spacer for a roll-to-roll process according to claim 2, wherein the roughened portion has a structure having a continuous recess design.   The roll-to-roll process spacer according to claim 3, wherein the roughened portion is composed of a plurality of columnar bodies protruding from a plane.   2. The roll-to-roll process spacer according to claim 1, wherein the roughened portion is separably installed on the surface of the roll-to-roll process spacer.   6. The roll-to-roll process spacer according to claim 5, wherein the roughened portion has a belt-like structure having a continuous recess design.   The roll-to-roll process spacer according to claim 6, wherein the belt-like structure is a metal mesh band.   2. The roll-to-roll process spacer according to claim 1, wherein a total thickness of the roll-to-roll process spacer plus a strip-shaped piece-like laminate is between 30 and 3000 [mu] m. Spacer for two-roll process.   The roll-to-roll process spacer according to claim 1, wherein a smooth surface of the roll-to-roll process spacer is bonded to a side surface of the strip-type piece-like laminate that does not include a volatile substance during the roll-to-roll process, and A roll-to-roll process spacer, characterized in that a surface on which a roughened portion of the roll-to-roll process spacer is installed is bonded to another side surface having a volatile substance in the strip-type piece laminate. .   2. The roll-to-roll process spacer according to claim 1, wherein a height at which the roughened portion protrudes from a surface of the roll-to-roll process spacer is 15 to 1000 μm. Spacer.   2. The roll-to-roll process spacer according to claim 1, wherein an average roughened portion depth (Rz value) of the smooth surface is 1 mm or less. In a method for producing a laminate for a printed circuit board using a roll-to-roll process spacer,
(1) A step of obtaining a strip-shaped piece-like laminate including a substrate and a material layer formed on the substrate and containing a volatile substance,
(2) When removing the volatile material by winding and heat-treating the strip-type flake laminate, the roll-to-roll process using the roll-to-roll process spacer described above is used to roll Isolating the strip-type flake laminate, of which the surface on which the roughened portion of the roll-to-roll process spacer is placed is opposed to the material layer of the strip flake laminate,
(3) The wound strip-type laminate laminated with the roll-to-roll process spacer is heated with the roll-to-roll process spacer, and the volatile material is coarsened on both sides of the roll-to-roll process spacer. The step of discharging from the recess in the conversion part,
A method for producing a laminate for a printed circuit board using a roll-to-roll process spacer for a roll-to-roll process, comprising the above steps.

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