JPH06191561A - Method for preserving laminated body - Google Patents

Abstract

PURPOSE:To maintain constant performance of a laminated body comprising layers having specific functions such as peeling ability, conductivity and photosensitivity irrespective of changes in environments and humidity during storage. CONSTITUTION:In storing a laminated body including one or more layers having specific functions on a support body, a medium such as a paper sheet having a moisture content of an equilibrium moisture content or higher is overlaid on the specific function layers or in other ways to adjust moisture of the specific function layers to uniform humidity.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for storing a laminated body, and more specifically, it eliminates variations in performance of a laminated body provided with a layer having a specific function due to changes in humidity, particularly variations in performance of a layer having a specific function. The present invention relates to a method for storing a laminated body.

[0002]

2. Description of the Related Art Conventionally, a laminate having at least one layer having a specific function on a support has been known as an electric / electronic material, an information recording material, a photographic material, a medical-related material. There are materials, construction-related materials, etc.
It is widely used in the industrial field. Among them, as an example of the use of a laminate having conductivity as a specific function, there is one in which the surface resistance value or the volume resistance value is lower than the intrinsic resistance value of the support. For example, the surface resistance value is about 10 ⁻¹² Ω / cm ² for the purpose of preventing static electricity, and about 10 ⁻⁹ Ω / cm ² for the purpose of using it as PPC paper. When used as an electrostatic recording paper, the volume resistance value of the conductive layer is individually adjusted to about 10 ⁻⁶ Ω / cm ³ for each purpose of use.

There is an electrostatic recording film as a material used for the electrostatic plotter. The film for electrostatic recording is generally one in which, when paper is used as a support, the paper is subjected to a conductive treatment to provide a dielectric layer on one side, and a paper is used as the support on one side to provide a conductive layer and a dielectric layer in sequence, It is also formed by sequentially providing a conductive layer and a dielectric layer on a plastic film. In this electrostatic recording film, the surface resistance value of the conductive layer greatly affects the drawing performance.Therefore, it is important how to keep the surface resistance value within the appropriate tolerance range. It was Especially when an ion conductive type conductive agent that is easily affected by humidity is used for the conductive layer, the surface resistance value changes greatly due to humidity change, and when the water content of the conductive layer is 20% RH or less, 80% RH or more. Could not obtain images and could not be used.

As a laminate having a specific function of peelability,
There are those used for producing an original drawing by cutting and peeling a required portion of a light-shielding layer having releasability in photolithography, or a light-shielding masking film having a photosensitive layer laminated on the releasable light-shielding layer. This light-shielding muskin film is generally provided on one side of a plastic film support,
It is formed by providing a peelable light-shielding layer. As one of the required performances to be satisfied by the light-shielding masking film, it is necessary that the peeling strength of the peelable light-shielding layer is within a certain range. It is well known that the water content in the coating film plays a role of a plasticizer, but as a result, especially in the case of a coating film mainly composed of a water-soluble resin or a water-swellable resin, when the water content is extremely low. , The peeling strength is light, but the coating film is easily cracked during peeling. Further, if the water content is too high, the coating film may be stretched at the time of peeling, or the coating film may become soft, so that the peeling strength becomes heavy and the workability is deteriorated, or blocking may occur. there were.

Further, a laminate having a specific function of photosensitivity is
Many techniques have been disclosed for preventing changes in coating film physical properties such as changes in sensitivity and surface stickiness. For example, the intuition film, which is a photosensitive material for silk screen, may have a photosensitive layer mainly composed of polyvinyl alcohol and diazo resin, which are water-soluble resins, but when many sheets are stacked and stored, the storage environment is humid. If so, it causes moisture absorption and blocking of the surface, which deteriorates handleability, and in extreme cases, when one sheet is peeled off, the photosensitive film blocks on the back surface of the lower support, which causes problems such as damage to the photosensitive film. Was there.

In addition to the above, the laminate provided with a layer having a specific function has physical properties of the layer having a specific function, such as cohesive force,
It often happens that when the elongation, the strength, etc. are changed, the performances that the laminate itself should have, such as peelability, photosensitivity, conductivity, etc., are hindered. Therefore, in order to maintain the performance of the laminate, particularly the layer having a specific function, the emergence of a simple storage method has been desired.

The present invention has been made in view of such conventional problems, and has a specific function capable of maintaining constant performance regardless of changes in the environment during storage, particularly changes in humidity. It is an object of the present invention to provide a method for storing a layered product.

[0008]

[Means for Solving the Problems] As a result of intensive research to achieve the above object, a layer having a specific function (hereinafter, referred to as
By adjusting the moisture content of the specific functional layer) to a uniform level in advance, it is less likely to be affected by the surrounding environment.
The present invention has been completed by finding that a specific function can be maintained.

That is, the method for storing a laminate according to the present invention is
The moisture of the specific functional layer of the laminate, in which at least one specific functional layer is provided on the support, is preliminarily uniformly adjusted. The laminate to which the storage method of the present invention is applied,
So-called photographic characteristics such as peelability, conductivity, photosensitivity, storability,
Any material having a specific function such as adhesiveness, absorbability, rigidity, flexibility, etc., which can be adjusted to a predetermined water content in terms of its performance, may be used, for example, a light-shielding masking film having a peelable light-shielding layer, a protective film. And the like, such as a laminate having releasability, an electrostatic recording film having a conductive layer, a PPC film, a conductive laminate such as a recording film, a diazo photosensitive layer, and a compound having an ethylenically unsaturated double bond. It can be applied to a photosensitive laminate such as a photosensitive film having a photosensitive layer and a photosensitive layer containing a dichromate compound.

Here, the specific functional layer provided in the laminate is
It may be formed by any method such as coating, laminating and extrusion, and may be not only one layer but also multiple layers. Needless to say, the support for the laminate in the present invention is not limited to paper and plastic films, and metal plates, glass and the like can be used.

As a method for controlling the humidity of the layer having a specific function, spraying mist-like water, passing through a humidifier, imparting water with a roll containing an appropriate water content, or containing an appropriate water content It is possible to adopt a method such as stacking a medium having a specific function on a layer having a specific function, but in any case, the layer having the specific function absorbs water uniformly, and a specific function, in other words, practical performance can be sufficiently exerted. Humidity range should be adjusted. The method of stacking water-containing media is most preferable from the viewpoint of easy adjustment of water content.

The medium containing water is a broad definition of a material having a property of absorbing and releasing water, and includes paper, synthetic paper, cloth and the like, and particularly, the diffusion rate of water, versatility and lowness. Paper is preferable in terms of cost. As the paper, it is possible to widely use paper that can hold a water content equal to or more than the equilibrium water content, but from the viewpoint of cost, economy, etc., wood pulp made from softwood or hardwood is used as a raw material, and it is stored during use. Paper having strength that does not tear, fluff-free surface, and good smoothness can be appropriately used. The grammage is 40 to 60 from the viewpoint of the necessity of allowing the layer having a specific function to absorb water and the economical efficiency.
g / m ² is preferred.

The water content of the paper does not need to be adjusted according to the daily working environment, and the relative humidity is 70 to 80% or more, that is, the paper having the above basis weight is 7.0% or more. preferable. If the water content is excessively high, the paper itself will not be strained, or the water will overflow when stacked, resulting in a decrease in workability. Therefore, the water content is usually 7.0 to 11.0%. A paper having a is used appropriately. If the basis weight is large, the range of such a water content may be smaller than 7.0%,
If the basis weight is low, it may be higher than 11.0%.

When paper is used as a medium capable of uniformly absorbing water, in order to improve the cutting property, 5 to 25% of synthetic fibers such as rayon and staple fibers and synthetic fibers such as polyethylene and vinylon are mixed. It can be one.
When it is 5% or more, the cutting property can be improved and damage to the blade can be suppressed. Further, when the content is 25% or less, the water content of 7.0% or more can be maintained.

If the support of the laminate is one that easily absorbs and desorbs moisture, such as paper and cloth, the support is conditioned rather than the layer having a specific function. It is preferable to give humidity to the layer having a specific function through, and it is preferable to use a hygroscopic, non-moisture-permeable synthetic resin film as a medium, for example, polyethylene, polystyrene, polypropylene, polyvinyl chloride, acrylic resin. , Polyvinylidene chloride, polyimide, etc. can be used, and may be transparent or colored. However,
A cellulose acetate film having a high water absorption rate and a high moisture permeability is not preferable.

[0016]

In the method for storing a layered product of the present invention, the layer having a specific function is adjusted to have a uniform moisture content in advance so that the layer having the specific function is less affected by humidity during storage. The performance of the provided laminated body can be maintained.

[0017]

EXAMPLES The present invention will be described in more detail by way of examples. Example 1 Wood pulp 100 was placed on the photosensitive layer of a masking film for plate making (New Piltik E Kimoto Co.) in which a peeling light-shielding layer and a photosensitive layer were sequentially laminated on a polyester film.
%, Grammage 48 g / m ² , and moisture content 7.0% are stacked, wrapped with polyethylene laminated paper and packed with a cosmetic box.
Temperature 20 ℃ relative humidity 65%, temperature 20 ℃ relative humidity 90%
It was saved under the environment.

The peeling strength of the sheet immediately after cutting, the sheet wrapped in polyethylene laminated paper and packaged in a cosmetic box for 1 day, and the sheet left for 7 days after packaging / packing was evaluated for peel strength. Compared to the case without. The results are shown in Table 1. In addition, the evaluation of peel strength is 25 mm
Measuring machine (T with a sample width of
Peeling was performed with ENSILON HTM-100 (manufactured by Toyo Baldwin Co., Ltd.). When the peeling strength was appropriate, it was evaluated as ◯, when the peeling strength was slightly heavy, as Δ, and when the film was stretched and could not be peeled, it was evaluated as x.

[0019]

[Table 1]

Example 2 On a polyester film support, a conductive layer containing an ion conductive conductive agent (Chemist 6300 manufactured by Sanyo Kasei Co., Ltd.) and a dielectric layer made of an acrylic acid copolymer (Hima SBA720 manufactured by Sanyo Chemical Co., Ltd.) The influence of the water content of the electrostatic recording film formed by sequentially laminating the layers on the image quality was examined. As a result, some images were obtained at a water content of 0.85 to 1.20%, but it was shown that a water content of 1.0 to 1.15% was a practical level.

Wood pulp 85 was added to the electrostatic recording film.
%, Polyethylene 15%, basis weight 40 g / m ² , water content 8.
After stacking 0% paper, wrapping with polyethylene laminated paper and packing with a cosmetic box, leave it in an environment of temperature 20 ° C relative humidity 60%, temperature 20 ° C relative humidity 80%, and then measure the water content and keep it still. An image was formed with an electric plotter and the image quality was evaluated. As a comparative example, a comparison was made with the case where the sheets were left without being stacked.

As a result, when the paper is not overlaid, the moisture content does not reach the practical level of 1.0% even after about 10 hours when the relative humidity is 60%, and the relative humidity is 80%. Then, after about 10 hours, the practical level exceeded 1.15%, but when the papers were left to overlap, a constant practical moisture content was always maintained, and a good quality image could be obtained. . Example 3 On a conductive support obtained by coating high-quality paper with polyvinylbenzyltrimethylammonium chloride (CS6300H manufactured by Sanyo Kasei Co., Ltd.), a dielectric layer made of a vinyl chloride-vinyl acetate copolymer was sequentially laminated, and electrostatically charged. I got the recording paper.

After the moisture content of this electrostatic recording paper was adjusted to 1.1%, polyethylene films were overlaid and evaluated in the same manner as in Example 2. As a result, good quality images could be obtained. Example 4 A polyester film was coated with a coating liquid mainly composed of polyvinyl alcohol and diazo resin and dried to obtain a photosensitive film for silk screen. Immediately after drying, polyethylene films were overlaid and seasoned in an environment of a temperature of 20 ° C. and a relative humidity of 55%.
After standing in a 0% environmental test room, the blocking property was examined. Similarly, the blocking property was examined when polyethylene films were not stacked. As a result, no blocking was observed even when the polyethylene films were stacked, even if the humidity changed. Further, when the polyethylene films were not stacked, the photosensitive layer absorbed moisture due to humidity and blocking occurred.

From these results, it was shown that the performance required for the layer having a specific function is maintained for a long period of time by the method for storing a laminate of the present invention.

[0025]

As is apparent from the above examples, according to the method for storing a laminate having a layer having a specific function of the present invention, the moisture content of the layer having the specific function is adjusted in advance. Since it did in this way, a required specific function can be maintained regardless of the change of the environment where a layered product is put.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kunihiko Yohoku, Saitama Prefecture 4-63-5, Suzuya Co., Ltd. Inside Kimoto Central Research Institute (72) Inventor Yumiko Katagiri 4-6-35, Suzuya, Yono City, Saitama Prefecture In stock company Kimoto Central Research Institute (72) Inventor Toshiaki Araki 4-63 Suzuya, Yono City, Saitama Prefecture In stock company Kimoto Central Research Institute (72) Inventor Masaru Ishii 4-63 Suzuya, Yono City, Saitama Prefecture Stock Company Kimoto Development Laboratory

Claims (8)

[Claims] 1. A laminate, wherein when a laminate having at least one layer having a specific function provided on a support is stored, moisture in the layer having the specific function is adjusted in advance in advance. How to save. 2. The method for storing a laminated body according to claim 1, wherein a medium is stacked on the laminated body. 3. The method for preserving a laminate according to claim 2, wherein the medium is paper, synthetic paper, cloth, or film. 4. The method for preserving a laminate according to claim 2, wherein the medium is paper having a water content equal to or higher than the equilibrium water content. 5. The method for storing a laminated body according to claim 1, wherein the medium is overlaid and stored after the humidity of the laminated body is adjusted. 6. The method for storing a laminate according to claim 1, wherein the layer having the specific function is a layer having peelability. 7. The method for preserving a laminate according to claim 1, wherein the layer having the specific function is a layer having conductivity. 8. The method for storing a laminate according to claim 1, wherein the layer having the specific function is a layer having photosensitivity.