US 12,214,607 B2 · Image recording method

Abstract

Provided is an image recording method including applying a pretreatment liquid containing water and a resin X and an ink containing water and a colorant onto a resin base material A which has a specific distortion rate and to which a tension is applied, to obtain an image, heating the image to a temperature Td and drying the image, and cooling the image to a temperature Tr, in which σtotal calculated by Equation (1) is 40 kgf/cm2 or less. E(Td) represents an elastic modulus of the resin X at the temperature Td, ε(Td) represents an expansion coefficient of the resin base material A under specific conditions, E(T) represents an elastic modulus of the resin X at a temperature T of the image in the cooling, αr(T) represents a linear expansion coefficient of the resin X at the temperature T, and αs(T) represents a linear expansion coefficient of the resin base material A under specific conditions. σ total =  σ dry + σ cool  Equation ⁢ ⁢ ( 1 ) σ dry = E ⁡ ( T d ) ⁢ ⁢ ɛ ⁢ ⁢ ( T d ) Equation ⁢ ⁢ ( 2 ) σ cool = ∫ T r T d ⁢ E ⁡ ( T ) ⁢ ( α r ⁡ ( T ) - α s ⁡ ( T ) ) ⁢ dT Equation ⁢ ⁢ ( 3 )

An image recording method comprising:

preparing a resin base material A in which an absolute value of a distortion rate represented by Equation (a1) in a case where the base material is heated from 25° C. to 60° C. at a temperature increasing rate of 5° C./min and maintained at 60° C. for 2 minutes in a state where a tension of 30 N/m is applied thereto, and the base material is cooled to 25° C. at a temperature decreasing rate of 5° C./min in a state where a tension of 30 N/m is applied thereto is 0.05% or greater;
preparing a pretreatment liquid containing water and a resin X;
preparing an ink containing water and a colorant;
sequentially applying the pretreatment liquid and the ink onto the resin base material A to which a tension S1 of 10 N/m or greater is applied to obtain an image;
heating and drying the image to a temperature Td of 50° C. or higher in a state where a tension S2 of 10 N/m or greater is applied to the resin base material A;
and
cooling the image after the drying to a temperature Tr of 30° C. or lower in a state where a tension S3 of 10 N/m or greater is applied to the resin base material A,
wherein σtotal to be calculated by Equation (1) is 40 kgf/cm2 or less,
distortion rate(%)=((length of resin base material in tension application direction at end of cooling−length thereof in tension application direction at start of heating)/length thereof in tension application direction at start of heating)×100 Equation (a1)
σ
total
=

σ
dry
+
σ
cool

Equation
⁢
⁢
(
1
)
σ
dry
=
E
⁡
(
T
d
)
⁢
⁢
ɛ
⁢
⁢
(
T
d
)
Equation
⁢
⁢
(
2
)
σ
cool
=
∫
T
r
T
d
⁢
E
⁡
(
T
)
⁢
(
α
r
⁡
(
T
)
-
α
s
⁡
(
T
)
)
⁢
dT
Equation
⁢
⁢
(
3
)
in Equation (1), σdry is calculated by Equation (2), and σcool is calculated by Equation (3),
in Equation (2),
E(Td) represents an elastic modulus of the resin X at the temperature Td which is expressed in a unit of kgf/cm2,
ε(Td) represents an expansion coefficient of the length of the resin base material A represented by Equation (a2) in the tension application direction in a case where the base material is heated from 25° C. to the temperature Td and maintained at the temperature Td in a state where the tension S2 is applied thereto, and the base material is cooled to 25° C. in a state where the tension S2 is applied thereto,
expansion coefficient of length of resin base material A in tension application direction=(length of resin base material in tension application direction at end of cooling−length thereof in tension application direction at start of heating)/length thereof in tension application direction at start of heating Equation (a2)
in Equation (3),
E(T) represents an elastic modulus of the resin X at a temperature T of the image in the cooling which is expressed in the unit of kgf/cm2,
αr(T) represents a linear expansion coefficient of the resin X at the temperature T,
αs(T) represents a linear expansion coefficient of the resin base material A in the tension application direction in a state where the tension S3 is applied thereto at the temperature T,
Td represents the temperature Td, and
Tr represents the temperature Tr.

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Image recording method

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Image recording method

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Abstract

Claims7