JP3441012B2 - Resin-coated photographic support and method for producing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] The present invention relates to a specific cooling law.
Speed of 150m / min or more using paper
Thermoplastic resin such as polyolefin (hereinafter simply referred to as resin)
Is heated and melted by an extruder, coated, and the surface is shaped.
Resin-coated photographic support and method for producing the same
It is. [0002] 2. Description of the Related Art A photographic support coated with a resin presses the resin.
It is heated and melted by an output machine, and the base material such as paper and the cooling roll
Extruded into a film in the middle and melted by nip rolls, etc.
It is manufactured by coating a base material with fat. Cooling roll is a tree
Used for forming the surface shape of the resin coating layer, for resin coated photo
The surface of the support is mirror-like due to the shape of the cooling roll surface
Alternatively, it is molded on a rough surface, and the rough surface
It can be formed in a shape or the like. [0003] Cooling roll with a mirror surface (highly smooth surface)
Is used, compared to a rough-shaped cooling roll
The adhesive strength between the molten resin and the cooling roll surface
The resin is not sufficiently cooled and peels off from the cooling roll.
The fine bumps called horizontal unevenness in the peeling
Constant on the surface of the true support in the direction perpendicular to the direction of travel
A striped pattern having periodicity occurs. This peeling horizontal unevenness
Generation occurs as the molten resin fills as the production rate increases.
Adhesion between cooling roll and molten resin without cooling down
Force, which is more likely to occur and hinders production speed improvements.
Is causing the problem. [0004] In addition, low molecular weight components of the resin are continuously operated.
Accumulates on the cooling roll surface, and
Insufficient separation may cause problems with the appearance of the surface.
In the case of a support, the surface gloss changes and the value of the product is impaired
Even if a uniform extrusion coating is performed at a constant speed,
Resin layer of coated photographic support is controlled by cooling roll
A peeling phenomenon occurs and peeling horizontal unevenness occurs. [0005] Furthermore, high-speed resin coating molding is performed.
Remarkable occurrence of crater-like pores on the resin-coated surface
And the occurrence frequency increases exponentially with the processing speed.
Add. Especially for high speed processing of 150m / min or more
As a result, crater-like pores on the resin-coated surface become prominent,
It will be a level that can not be used. Crater-like pores generated on resin-coated surface
Is the base material and molten resin when performing high-speed extrusion coating.
When pressing, the molten resin coated on the base material and the coolant
Entrapment of air between the growl and
This causes crater-like pores on the resin-coated surface. [0007] To prevent the crater-like pores
As a rule, increase the nip roll pressing pressure and
There is a method to reduce entrapment,
If the pressing pressure of the roll is increased, the heating
The surface of the molten resin layer is affected by irregularities on the substrate.
Is not possible to obtain a smooth surface as a photographic support.
There is a title. In addition, reduce the pressure around the crimp
Although it is possible, it is hard to say that it is a sufficient method. [0008] Also, seeds such as mat surface, silk surface, cloth surface, etc.
Cooling rolls with rough surfaces with irregularities of various shapes
When coating resin on paper and other substrates using
Even if the resin is coated at a high speed,
Since there are almost no porosity-like pores,
By making the surface shape of the ring roll rough,
A method for reducing the tertiary pores was also studied. This courier
The reason for roughening the surface shape of the roll is that high speed extrusion coating
When crimping the base material and the melted resin during molding
Between the molten resin coated on the substrate and the cooling roll
Air trapped by air entrapment in between
The cooling law is relatively larger than this air pocket.
Crater-like pores
Does not occur or is coarser than crater-like pores
Because the size of the surface is too large to confirm
That's why. However, a cooler having a rough surface is provided.
Photograph of a substrate coated with molten resin using a ring roll
Photographic paper with emulsion coated on a support for
Surface type glossy or poor gloss
Has the drawback that only a paint surface can be obtained.
Lack of performance as a type of high gloss photo paper
It is not a product because it has a fatal defect in quality. Ma
Conversely, use a cooling roll with fine surface irregularities.
When using, to coat the molten resin on the substrate, as described above
The occurrence of uneven horizontal separation and crater-like pores increased,
In the case of photographic paper with emulsion coated on a true support
However, defects on the photographic support remain on the emulsion layer,
The horizontal step unevenness shows horizontal step stripes, and
So that the glossy surface of the print will shine and scatter
It has the disadvantage of being visible and unpractical. As described above, in order to improve productivity,
Was contradictory to the roughness of the cooling roll surface
It is necessary to obtain the optimal shape
You. To complicate matters, the print gloss of photographic paper
In a normal gloss meter, a print table with the same value
It can be seen that even on the
It is not enough to evaluate with a gloss meter that has been used since then
I know that there is. [0011] As a method for preventing peeling horizontal unevenness,
Adds a separating agent to the resin, thereby causing
Reduces adhesion to the cooling roll surface,
The extruded resin film into a cooling roll
There has been proposed a method of peeling off from the substrate. For example, JP-A-63
No. 30841 discloses a polyalkylene glycol.
A method of providing a resin coating layer containing 40 ppm to 1%,
JP-A-64-9444 discloses a fluorine-containing polymer.
To provide a resin layer containing 40 to 1500 ppm of
More ways to improve peelability and dirt on the cooling roll
Proposed. However, these methods do not
If the amount of the release agent is excessive, poor kneading of the resin and increased smoke
And the accompanying cooling roll stains and oil fumes
Spots on the surface of the resin layer due to adhesion
The view is impaired. In addition, the adhesive strength between the base material such as paper and the resin
To reduce the value of the product.
It's hard to say. Further, Japanese Patent Application Laid-Open No. 3-200140 discloses
Pays attention to the equipment around the extruder,
Cooled and solidified by the process and bound to the sheet-like substrate
Keep the oil coating layer on the cooling roll with an interval of 5 mm or less.
Cooling roll through the peeling roll arranged
There is also proposed a method to improve by peeling from
You. However, this method does not
It may be effective in the range of 100m / min.
No, but for high-speed coating of resin at 150m / min or more
If the distance between the cooling roll and the peeling roll is
No effect was observed at all when placed below. Further, as an effective countermeasure against uneven horizontal separation,
Using a cooling roll with fine irregularities
The surface of the grease-coated photographic support is molded with fine irregularities
The method of manufacturing is proposed in Japanese Patent Publication No. 62-19732.
And the upper limit coating speed is described as 100 m / min or more.
However, during high-speed processing at 150m / min or more,
Contamination components accumulate on the cooling roll per unit time
The amount of heat is accelerated and the cooling roll and molten resin
As a result, the peeling horizontal unevenness can be prevented.
I can not do such a thing. [0014] Further, the publication discloses a crater-like pore.
Is not listed in the table.
High speed extrusion coating mold at 150m / min or more using a tool
At the time of attachment, crater-shaped pores cannot be prevented. Further
Stipulates the roughness and pitch of the cooling roll surface.
However, the shape of the unevenness is considered for uniformity
Absent. If there is unevenness in the surface shape, the shape will be transferred
Unevenness on the surface of the resin-coated photographic support
Of the surface of the photographic paper coated with the photographic emulsion
The glossiness may be reduced by visual observation, and the problem is still
Not decided. Next, as a measure against crater-like pores,
Japanese Unexamined Patent Publication No. 63-246227 discloses cooling of a thermoplastic resin.
Space surrounded by cooling members and thermoplastic resin film before cooling
Is maintained in a gaseous atmosphere having good permeability to the thermoplastic resin membrane.
Therefore, a method to prevent crater-like pores has been proposed.
Have been. However, in this method, thermoplastics such as carbon dioxide
By using a gas with good permeability to the conductive resin membrane,
Also need huge investment to maintain safety
However, gas behavior during high-speed extrusion coating
Induces stability and stably prevents crater-like pores
I can't do that. Further, Japanese Patent Application Laid-Open No. Sho 59-198451 discloses
Divides polyolefin into two layers and sequentially coats
And the thickness of the polyolefin upper layer (t_a) And poly on the base paper side
Olefin underlayer thickness (t_b) To 0.35 to 4.0
As a result, a method to prevent crater-like pores has been proposed.
Have been. However, in this method, the sequential coating
The device itself becomes larger,
Equipment costs increase. Also apply the resin more than once
As a result, the process loss also tends to increase,
It is not always a useful method. Further, the surface of the base paper before coating with a resin
A method to improve the crater-like pores from the surface shape was also studied.
ing. For example, Japanese Patent Application Laid-Open No. 4-81835 discloses
The joint strength is set to 1.2 to 1.8 kg · cm,
Calendering between metal roll and synthetic resin roll
By coating polyolefin on base paper
A method for preventing tar-shaped pores and a method disclosed in JP-A-4-81836.
In the official gazette, the base paper is calendered with a metal roll-synthetic resin roll.
-Immediately after the treatment,
Methods to prevent more crater-like pores have also been proposed.
You. These methods certainly prevent crater-like pores
Effect is recognized, but at 150m / min or more
Extrusion coating molding is not as effective as it is
Not a solution. The emulsion is coated on a resin-coated photographic support.
The evaluation of the appearance characteristics of the printed photographic paper
Evaluation method based on color and gloss has already been established as a standard
Using a generalized measurement method.
I have. However, in recent years, these methods
Can be affirmed, but there are many unsatisfactory points in practice
Criticism is growing. In particular, two mirrors with similar gloss
Image on the emulsion print surface when comparing photographic papers
If the object image looks different, the glossiness of the visual appearance
Photographic paper with a clearer image is more glossy
May be perceived. For example, home appliances and car bodies
For products that emphasize surface aesthetics, such as measuring the specular gloss
Is the same as not being able to evaluate
is there. Therefore, the mapping of the emulsion print surface of photographic paper
Sex measurements have become necessary. From the above, the resin-coated photographic support was
Roughness of cooling roll surface used for extrusion coating mold
By increasing the thickness, horizontal peeling unevenness and crater-like thinness
It is easy to prevent holes, but increase the roughness.
The image quality of the emulsion surface was reduced due to
Is necessary to obtain the optimal shape.
Call [0020] SUMMARY OF THE INVENTION Therefore, the present invention
The first purpose is with a 150 m / min extrusion coating mold.
The peeling speed of the resin-coated photographic support
Prevents unevenness of the steps, and with the passage of time in high-speed continuous operation
Prevents resin components from accumulating on cooling rolls
That is. The second purpose is resin-coated
To prevent crater-like pores on the surface of the
You. Furthermore, the third purpose is for photographic use after coating the emulsion.
A resin-coated photographic support and a glossy photographic paper
And a method of manufacturing the same. [0021] SUMMARY OF THE INVENTION The present invention is directed to paper or synthetic paper.
On a paper substrate,Ten-point average roughness with a surface wavelength of 0.8 mm or less
0.8-1.2 μm, average pitch 5-30 μm
Yes, and cutting depth / maximum relative load curve
Table with relative load length of 50-90% when height is 70%
Using a cooling roll with surface roughness,150m /
Extrusion coating of molten polyolefin resin at a speed of min or more
With resin-coated photographic support obtained by molding
The resin-coated surface on the side where the emulsion layer is provided,
Surface wavelength of 0.08 mm or less, 10-point average roughness (hereinafter, referred to as
Rz) is 0.3 to 0.7 μm and the average pitch is 5
Cutting at 40 μm and relative load curve
Depth (hereinafter abbreviated as CV) / Maximum height (hereinafter Rmax)
) Is 30% (hereinafter referred to as tp).
Abbreviated) has a resin roughness of 10-50%
Support. [0022] Hereinafter, the present invention will be described in detail. First
In addition, the roughness parameter representing the surface shape used in the present invention
explain about. Rz used in the present invention is expressed as
Therefore, for example, a table made by Tokyo Seimitsu
Surface roughness analyzer Surfcom E-RM-S27A type
It is possible to analyze by, for example. R in the present invention
z is the part extracted from the cross-sectional curve by the reference length.
Straight line that is parallel to the average line and does not cross the section curve
The highest to fifth peaks measured in the direction of vertical magnification from
Of the average altitude and the altitude of the valley bottom from the deepest to the fifth
The value of the difference from the average is expressed in micrometer (μm)
JIS B0601-1982 (Japanese Industrial Standard)
Stipulated. [0024] ## EQU1 ## Rz = ｛(R1 + R3 + R5 + R7 + R9)-(R2
+ R4 + R6 + R8 + R10)｝ / 5 R1, R3, R5, R7, R9 correspond to the reference length
From the highest to the fifth peak of the sampling part
2, R4, R6, R8, R10 are the extracted parts corresponding to the reference length
Is the valley bottom from the deepest to the fifth. In the present invention, the average pitch is defined as a sectional curve.
In the part extracted by the reference length from
Cut and go from mountain to valley to next mountain to valley
When the distance to the crossing point is Smi, the total number of distances is
If N, the average pitch can be obtained by the following equation (2).
287/1 (international standard). [0027] (Equation 2) Average pitch = (1 / N) Σ Smi (μm) The term tp in the present invention is based on the cross-sectional curve.
Extract only a quasi-length, parallel to the average line of this criterion length section.
At a certain level (from the highest peak of the reference length section to this level)
Cut the reference length section with a straight line
The total length of the cut line (L) and the reference length
Is called tp at that level (CV), and IS
O 4287/1 (international standard). What
In the present invention, the cutting depth CV / Rmax
(%) Is the relative load length tp of the uneven surface shape.
It was used as an index of uniformity in the height direction. [0029] Tp = (L1 + L2 + Ln-1 + Ln) / reference length
X 100 (%) In the present invention, Rmax is a sectional curve.
Parallel to the average line of the part extracted by the reference length from
The straight line of the peak height and the straight line of the lowest valley depth parallel to the average line
Measure the interval between the two straight lines in the direction of the longitudinal magnification of the cross-sectional curve, and
Value in micrometer (μm)
 In accordance with JIS B0601-1982 (Japanese Industrial Standards)
Is defined. In the present invention, a photograph corresponding to the visual gloss
The image quality will be described in detail. Image clarity means that
When an object is reflected, how sharp and distorted the image is
(Distortion)
It is an important characteristic that determines the aesthetic element of the vehicle body painting
Yes, it is a technology that has been developed in recent years. How to measure image clarity
The method is specified in JIS H 8686 and uses optical devices.
From the waveform of the amount of light obtained through the optical comb
Is obtained as image sharpness. Optical comb is light
The ratio of the parts is 1: 1, and the width is 0.125, 0.5, 1.0.
And 2.0 mm. The measurement is optical comb
To move the maximum waveform (M) and the minimum waveform on the recording paper.
(M) is read, and the image sharpness is determined by the following equation. [0032] C = (M−m) / (M + m) × 100 Here, C: image sharpness (%), M: highest waveform, m: lowest
It is a waveform. The image clarity C is good when the value is large.
If it is small, it has “bokeh” or “distortion”
Is shown. If this image has less “bokeh” or “distortion”
For example, even if the gloss value on the gloss meter is the same,
It can be seen that the glossiness is improved. Next, the resin-coated photographic support of the present invention will be described.
And will be described in detail. The present inventors have various surface irregularities.
As a result of investigation using cooling rolls
Factors that reduce the image clarity of the surface are the minute
It turned out to be a swell. This swell is cool
Support for resin-coated photos molded with uneven roll surface
It was clarified that it was generated in the irregularities on the surface of the holding body.
Therefore, the pitch of the surface irregularities is specified, and the height of the irregularities is determined.
Manufactured using cooling rolls that are as uniform as possible
Of irregularities in the surface shape of the resin-coated photographic support
To make the height of the unevenness as uniform as possible.
Improves image clarity on the surface of photographic paper coated with photographic emulsion
Turned out to be possible. The present invention is directed to the use of 15
Pressing the molten polyolefin resin at a speed of 0 m / min or more
Resin-coated photographic support obtained by out-molding
Resin coating table on the side of the carrier on which the emulsion layer is provided
If the surface has a surface wavelength of 0.08 mm or less, Rz is 0.3 to
0.7 μm, preferably 0.4 to 0.5 μm
You. If Rz is larger than 0.7 μm, photographic emulsion will be applied.
The image clarity of the photographic paper surface deteriorates. The average of the irregularities on the resin-coated surface of the present invention is
The pitch is 5 to 40 μm, preferably 10 to 20 μm.
μm. If the average pitch is larger than 40 μm,
Swelling occurs on the surface of photographic paper coated with true emulsion,
Performance is reduced. In addition, the relative load curve of the resin-coated surface of the present invention.
Relative load length t when CV / Rmax in line is 30%
p is 10 to 50%, preferably 20 to 40%
is there. If tp is smaller than 10% or larger than 50%
Photographic paper surface coated with photographic emulsion without uneven height
Undulation occurs on the surface, and image clarity is reduced. Further, the resin-coated photographic support of the present invention
The manufacturing method will be described in detail. In the present invention, 15
Paper or synthetic paper substrate at a processing speed of 0 m / min or more
Then, the molten polyolefin resin is extrusion coated
Cooling used in manufacturing fat-coated photographic supports
The surface of the roll is Rz having a surface wavelength of 0.8 mm or less,
0.8 to 1.2 μm, preferably 0.9 to 1.0 μm
It is in the range of μm. If Rz is smaller than 0.8 μm,
At the time of high-speed extrusion coating molding, peeling horizontal unevenness, clay
Cannot prevent tar-shaped pores,
Rz of the surface of the resin-coated photographic support
When the thickness exceeds 0.7 μm, the image clarity decreases. In addition, the cooling roll surface of the present invention
The average pitch of the protrusions is 5 to 30 μm, preferably 1 to 30 μm.
0 to 20 μm. Average pitch is larger than 30μm
If it is, the slope of the uneven surface becomes gentle, the cooling area is small, and peeling
The horizontal unevenness cannot be prevented. In addition, resin coating
There is a pitch of 50μm or more on the surface of the true support.
And the image clarity is reduced. Conversely, the average pitch is 5
If it is smaller than μm, continuous operation will result in low molecular weight resin.
This makes it easier for the components to accumulate on the cooling roll surface,
Deposition failure occurs due to deposits, and the surface of the photographic support
Changes the luster of the product, reducing the value of the product. In addition, the cooling roll of the present invention
When CV / Rmax in the relative load curve of the surface is 70%
Has a tp of 50 to 90%, preferably 60 to 80%.
%. Tp of cooling roll surface is less than 50%
On the other hand, if it is larger than 90%,
The tp of the surface is out of the range of 10 to 50%,
The image clarity of the photographic paper surface coated with the true emulsion will be reduced.
U. The present invention relates to paper made from natural pulp or paper.
Substrates such as synthetic paper made of synthetic fibers or their mixed paper
Thermoplastic resins such as polyethylene and polypropylene.
Or the polyolefin copolymer is melt-pressed alone or as a mixture.
It was coated from the launch machine. Resin coating layer thickness
There is no particular limitation, about 5 to 200 μm,
In particular, about 15 to 50 μm is preferable. Emulsion layer
A preferred coating layer on the side provided with is titanium dioxide or
Mixtures of titanium dioxide with other white pigments or fillers
And a polyethylene resin composition is particularly preferred. Further
Fewer colored pigments, dyed optical brighteners, or other known additives
It may be contained in an amount. Polyethylene resin composition is paper
Extrusion coating type
It is carried out at a temperature of from 270 to 330 ° C. The present invention
Substrates coated with polyethylene mixtures in
Sizing agent, paper strength agent, coloring agent, fluorescent whitening agent, etc.
May be added for use. Especially restricted on the basis weight of the substrate
About 50-300 g / m^TwoAbout 70, especially 70-
200g / m^TwoThe degree is preferred. The cooling law used in the present invention
The method of imparting the rough surface shape of the roll includes polishing the surface of the roll,
Evaporation method, sand blast method, etching method, electric drilling
Method, plating method, etc.
The sandblast method is also preferably used. First of all,
Select from the above methods and add fine irregularities to the surface
You. For example, apply chrome plating on a roll material such as iron.
It is applied with a thickness of 0 to 200 μm. At this time, the surface is polished,
After smoothing as much as possible, sandblasting
Add irregularities. Table of cooling roll used in the present invention
The surface processing method will be briefly described. On roll material surface such as iron
Cooling roll base and grinder polishing
Buffing and chrome plating
You. Further, buffing is performed again, and pinhole compensation is performed again.
Chrome plating and grinder polishing
You. Finally, grind the stone (mirror finish)
Perform sand blasting to the desired roughness and wash
You. Here, the sandblasting method according to the present invention is used.
The procedure is briefly described. Abrasive grain size, air pressure, abrasive grain nozzle
Diameter, gun nozzle diameter, gun feed speed, nozzle distance, roll
Appropriately set by setting conditions such as number of rotations and number of processing (number of passes)
As a result, a predetermined cooling roll metal surface is obtained.
The surface shape of the cooling roll is obtained. The material of the cooling roll of the present invention is iron or other metal.
Chromium plating or nickel, enamelling, stainless steel
Various types such as less steel and Teflon processed can be selected,
Each material and molding method can be arbitrarily selected
You. [0045] EXAMPLES The present invention will be described below in detail with reference to specific examples.
I will tell. The present invention is not limited to the embodiments.
No. All percentages below are by weight. Wide
Softwood bleached kraft pulp (LBKP) and softwood bleached sulph
Canadian 1: 1 mixture of wool pulp (NBSP)
Beat until 300ml with standard freeness
Then, a pulp slurry was prepared. As a sizing agent for this
Alkyl ketene dimer to pulp 0.5% by weight, strength
1.0% by weight of polyacrylamide to pulp as an agent,
2.0% by weight of cationized starch to pulp, polyamide
Add 0.5% by weight of pulp to pulp and add water
After dilution, a 1% slurry was obtained. This slurry is sent to fourdrinier
With a basis weight of 170 g / m^TwoAnd made into polyolefin
It was used as the base paper for resin-coated paper. [Examples 1 to 6]
0.918 g / cm^Three100% by weight of low density polyethylene
10% by weight of anatase type titanium
Melting the dispersed polyethylene resin composition at 320 ° C
And extrude to a thickness of 30 μm.
Metal surface is a surface roughness analyzer S manufactured by Tokyo Seimitsu
fines measured with rfcom E-RM-S27A
Cooling roll with various irregularities and under the conditions shown in Table 1
High-speed extrusion coating at a speed of 150 m / min or more using
Typed. The other surface has a density of 0.962 g / cm.^Three
The high-density polyethylene resin is also melted at 320 ° C,
Extrusion coating was applied to a thickness of 30 μm. [Quality evaluation method]
Horizontal peeling unevenness on the surface of the resin-coated photographic support,
The occurrence of crater-like pores was visually evaluated.
Furthermore, the surface of the resin-coated photographic support is treated with corona.
To obtain a silver halide emulsion for color at 13 g / m^TwoApplication
And evaluated the image clarity of the developed photographic paper surface.
Was. [Striped horizontal unevenness] The evaluation of peeled horizontal unevenness is grade evaluation.
The resin coated photographic support has a release grade of 4 or higher.
If this occurs, the appearance of the photographic paper may be impaired, such as reduced gloss.
Add Grade 1: No horizontal peeling unevenness observed Grade 2: Thin peeling horizontal unevenness is observed Grade 3: Peeling horizontal unevenness is observed, but not visible on emulsion layer
I can't Grade 4: The peeling horizontal unevenness is strong, and it looks thin on the emulsion layer.
Be Grade 5: Very strong peeling horizontal unevenness, strong on emulsion layer
Remains [Crater-like pores]
A 2.0-cm square of the surface of the overlying photo support is 10 times larger
Observe by magnifying with a pair and measure the diameter 0.4 mm (measured 40 μm) or less.
Grade evaluation is based on the number of upper pores.
When the grade is 4 or more, the glossiness of the photographic paper surface decreases.
The appearance is hindered. Grade 1: no pores on surface Grade 2: 1 to 10 can be found Grade 3: 11 to 50 can be found Grade 4: 51-100 can be found Grade 5: 101 or more [Image clarity] Image clarity is measured by Suga Test Instruments Co., Ltd.
Using a constant meter ICM-2DP type, optical comb width 2.0
It evaluated using mm. Table 1 shows the evaluation results.
You. When the C value falls below 50%, the mirror type
Lack of performance as high gloss photo paper
Cause trouble. [Comparative Examples 1 to 9] Metal of Cooling Roll
Surface is a surface roughness analyzer Surfcom manufactured by Tokyo Seimitsu
 Has fine irregularities measured by E-RM-S27A type
Using cooling rolls under the conditions shown in Table 1,
Example 1 except for the cooling roll surface roughness shown in
Extrusion coating was performed under the same conditions as described above. [0049] [Table 1]As in the first to sixth embodiments of the present invention, a predetermined rough
150m / using a controlled cooling roll
Even if it is manufactured at a high processing speed at min.
Crater-like pores and peeled horizontal
Photographs with few emulsion defects and emulsion coating
Excellent image clarity and high gloss
You. In Comparative Example 1, the processing speed was 100 m / mi.
n, the quality failure that occurs during high-speed machining is
A relatively good resin-coated photographic support that does not generate
Wear. However, in Comparative Examples 2 to 5, the mapping of the emulsion surface
Quality is good, but quality failure occurs
Faults that do not become products
Have. In Comparative Example 6, the resin-coated photographic support was used.
Good image clarity between the crater-like pores on the carrier and the emulsion surface
However, horizontal peeling unevenness occurred, and the emulsion surface
Horizontal unevenness occurs, which is impossible for photographic printing paper.
It is. Furthermore, in Comparative Examples 7 to 9, the resin coating
No surface failure occurs on the photographic support
Photographic paper coated with an emulsion
Image quality is reduced, and high glossiness as a mirror type is obtained.
And has a glossiness close to a matte tone. In particular,
In the ninth embodiment, the image clarity is significantly reduced, and the mirror surface
Similar to another matte tone, different from Ip photographic paper
The result is a photographic paper that only gives a glossy feel. [0052] The cooling roll of the present invention can be used.
With this, the extrusion coating mold speed of 150 m / min
The resin component accumulation on the cooling roll surface is reduced.
Of the resin-coated photographic support
Prevents porosity in the photographic paper after emulsion coating.
High glossiness is maintained, and a good surface as photographic paper
can get.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G03C 1/79 B32B 27/10

Claims (1)

(57) to the Claims 1] paper or synthetic paper substrate, the wavelength of the surface
0.8-mm or less, ten-point average roughness of 0.8-1.2μ
m, average pitch is 5 to 30 μm, and relative load
When the cutting depth / maximum height on the curve is 70%
Cooley having a surface roughness with a relative load length of 50 to 90%
, A resin-coated photographic support obtained by extrusion-molding a molten polyolefin resin at a speed of 150 m / min or more using a rolling roll, wherein the resin-coated surface on the side on which the emulsion layer is provided has a surface Wavelength of 0.08m
m, the relative load length when the ten-point average roughness is 0.3 to 0.7 μm, the average pitch is 5 to 40 μm, and the cutting depth / maximum height on the relative load curve is 30%. A resin-coated photographic support having a surface roughness of 10 to 50%.