JP3734416B2 - Manufacturing method for sheet-like laundry products - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for producing a sheet-like laundry article in which a thin layer of a dough-like detergent composition is formed on a flexible support.
[0002]
[Prior art and problems to be solved by the invention]
As a sheet-like laundry product free from scattering and leakage of the detergent composition, the present applicant previously described in JP-A-10-204400, a thin layer comprising a dough-like detergent composition having an entry hardness within a specific range, A sheet-like laundry article having a sheet-like water-soluble substrate disposed on both sides of the thin layer was proposed.
[0003]
According to the sheet-like laundry article, unlike the powder detergent, there is an advantage that the powder is not scattered when the detergent is put into the washing machine and the handleability is excellent. However, since the dough-like detergent composition does not necessarily have high fluidity, a thin layer made of the dough-like detergent composition is formed so as to exhibit excellent solubility with a uniform thickness and width and high in use. It is necessary to. In addition, it is not easy to form the thin layer without generating defects such as bubbles.
[0004]
A dough-like detergent composition is a kneaded product in which a powder composition such as solid detergent particles is dispersed at a high concentration in a fluid substance such as a liquid surfactant. Shows complex flow properties with intermediate properties. In particular, the properties of the dough-like detergent composition change from a fluid to a powder due to a change with time after adjustment. Furthermore, this property becomes even more pronounced as the concentration of the powder composition in the dough-like detergent composition increases. When forming a thin layer from the dough-like detergent composition which has such a property, it is preferable that this dough-like detergent composition has the high fluidity | liquidity, and it is preferable that the density | concentration of a solid detergent particle is low for that purpose. On the other hand, in order to express sufficient cleaning performance, it is preferable that the concentration of solid detergent particles is high. Thus, the fluidity and cleaning properties of the dough-like detergent composition are in a trade-off relationship.
[0005]
The formation of a thin layer comprising a dough-like detergent composition is described in JP-A-10-72599, column 9, lines 14-17 and JP-A-10-204499, column 14, lines 10-13. However, conditions for carrying out industrial production such as mass production are not specifically described because they are not directly related to the invention of the application.
[0006]
Apart from this, JP-A-7-209512 describes a color filter adhesive paste having a yield value of 0.1 Pa or more and a non-Newtonian viscosity index of 0.9 or less. However, the invention described in this publication focuses on the value of the intercept in the viscosity-shear rate curve, and is an intermediate between the fluid property and the powder property represented by the slope of the entire viscosity-shear rate curve. There is no description of the properties.
[0007]
Accordingly, the present invention provides a sheet-like shape capable of forming a thin layer of a dough-like detergent composition with a uniform thickness and width without causing defects such as bubbles while maintaining high detergency and solubility. An object is to provide a method for manufacturing a laundry product.
[0008]
[Means for Solving the Problems]
  The present invention contains at least one surfactant, alkali agent and metal ion scavenger.And the surfactant content is 5 to 50% by weight.In the state where the value of the plastic flow index BF represented by the following formula (1) is 6 or less,On a flexible support that runs at 5 to 100 m / min, it is coated with a die coater,The object is achieved by providing a method for producing a sheet-like laundry article formed in a thin layer.(However, (I) Shearing speed 10s ^-1 ~ 1,000s ^-1 A dough-like detergent composition prepared to have a viscosity at 1,000 mPa · s to 50,000 mPa · s is applied to a long belt-like flexible support continuously running in a predetermined direction at a shear rate of 10 s. ^-1 ~ 1,000s ^-1 A method for producing a sheet-like laundry article, which is applied continuously or discontinuously by predetermined coating means to form a thin layer of the dough-like detergent composition,
  (B) Shearing speed 10s ^-1 The viscosity at 3,000 mPa · s to 300,000 mPa · s and 1,000 s ^-1 The viscosity at 60 mPa · s to 20,000 mPa · s is expressed by the following formula: Casson Coefficient C in the equation ₀ And C ₁ 7 <C each ₀ <40 and 0.5 <C ₁ The dough-like detergent composition prepared to be <3 on a long belt-like flexible support continuously running in a predetermined direction, a shear rate of 10 s ^-1 ~ 1,000s ^-1 A method for producing a sheet-like laundry article, which is applied continuously or discontinuously by predetermined coating means to form a thin layer of the dough-like detergent composition, and
  (C) Each contains at least one surfactant, alkali agent and metal ion scavenger, and has a shear rate of 10 s. ^-1 The dough-like detergent composition prepared so that the viscosity in the range from 10,000 mPa · s to 100,000 mPa · s is in a state where the value of its thixotropy index TR represented by the following formula is 60 or less. The manufacturing method of the sheet-like laundry article which coats and forms in a thin layer is excluded. )
[0009]
[Equation 3]
[0010]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described below based on preferred embodiments with reference to the drawings. The principal part of the manufacturing apparatus 10 preferably used for the manufacturing method of the sheet-like laundry article of this invention is shown by FIG. The manufacturing apparatus 10 includes an endless belt 12 that is supported by a pair of rolls 11 and 11 ′ that rotate in the same direction. The endless belt 12 travels in the direction indicated by the arrow A in the drawing.
[0011]
On the outer surface side of the endless belt 12, an extrusion type die coater 13 is installed facing the endless belt 12. When the extrusion type die coater 13 is used, a dough-like detergent composition having a wide viscosity range can be applied as compared with other coaters, and a uniform coating film can be formed as compared with the case where other coaters are used. Since it can form, it is preferable. Further, since the dough supply to application is a closed system, the change in physical properties of the dough-like detergent composition is small as compared to other coaters, and the loss of the dough-like detergent composition is negligible. The coating ability can also be increased compared to other coaters. The die coater 13 has a front edge surface (not shown) and a back edge surface (not shown) at its tip, and extends between the two in a direction orthogonal to the traveling direction of the endless belt 12. A narrow slit (not shown) is formed. The die coater 13 is temperature-controlled at a constant temperature by an electric heater.
[0012]
The front edge surface and the back edge surface may be flat according to the rheological properties of the dough-like detergent composition, or may be curved surfaces having a predetermined curvature. Further, the width of the slit depends on the rheological properties of the dough-like detergent composition and the thickness of the thin layer to be formed, but it is 0.5 mm to 30 mm. This is preferable from the viewpoint of achieving both uniform formation of a coating film by stabilizing the flow of the film and practical ease of liquid feeding with respect to the coating pressure.
[0013]
The long belt-like flexible support 14 continuously drawn out from the original fabric (not shown) is guided by the guide roll 15 and then on the endless belt 12 in the same direction as the endless belt 12. Drive to. The flexible support 14 continuously travels along the front edge surface and the back edge surface of the die coater 13.
[0014]
The die coater 13 is connected to a supply source (not shown) of the dough-like detergent composition. The dough-like detergent composition is extruded from the supply source to the slit formed at the tip of the die coater 13 by a supply means such as a metered liquid feed pump, and the flexible support 14 continuously running through the slit. Coated on top.
[0015]
The die coater 13 is movable in a direction perpendicular to the traveling surface of the flexible support 14 (the direction indicated by arrow B in FIG. 1), so that the tip of the die coater 13 is connected to the flexible support 14. It is made possible to come in and out.
[0016]
By applying the dough-like detergent composition onto the flexible support 14 by the die coater 13, a thin layer 17 made of the dough-like detergent composition is formed on the flexible support 14. When the die coater 13 is always disposed at a position close to the flexible support 14, the thin layer 17 is continuously formed on the flexible support 14. On the other hand, when the die coater 13 performs the contact / separation operation with respect to the flexible support 14, the thin layer 17 is formed discontinuously on the flexible support 14.
[0017]
The thin layer 17 may be formed over the entire width of the flexible support 14. Preferably, the thin layer 17 is formed so that there are uncoated portions having a predetermined width on both sides of the flexible support 14. Further, there may be a non-coated portion having a predetermined width of one or more lines in the running direction of the flexible support, and a plurality of rows of thin layers may be formed simultaneously.
[0018]
The flexible support 14 may be directly supported by the pair of rolls 11 and 11 ′, or may be supported by arranging a roll directly below the die coater 13 with the flexible support 14 interposed therebetween. . Preferably, the flexible support 14 is supported by an endless belt 12 supported by the rolls 11 and 11 'as in the present embodiment.
[0019]
As the dough-shaped detergent composition coated on the flexible support 14, particularly suitable as a detergent for clothing is used. Further, the dough-like detergent composition has fluidity that can be supplied to the surface of the flexible support 14 and has shape retention in a thin layer state after being coated on the flexible support 14. Those provided are preferably used. In the present invention, the dough is a harmony between a powder composition and a fluid substance such as a liquid, a paste or a gel as described in JP-A-10-204499, which relates to the previous application of the present applicant. Say things. The material having fluidity includes those that are fluidized by heating, pressurizing, or shearing.
[0020]
Since the dough-like detergent composition is a kneaded product of a powder composition and a fluid substance such as a liquid surfactant, the dough-like detergent composition has an intermediate property between a wet powder and a slurry. It has complex flow characteristics. Therefore, the rheological properties of the dough-like detergent composition cannot be equated with ordinary fluids. As a result of various studies on the means for continuously and stably forming a uniform thin layer from the dough-like detergent composition having such special rheological properties, the inventors have studied the flow characteristics of the dough-like detergent composition. It was found that the linearity of has a great influence. In general, among the dough-like detergent compositions, those containing a powder composition such as solid detergent particles at a high ratio tend to exhibit plastic properties and become unstable in fluidity. In addition, the instability of the flow characteristics of the dough-like detergent composition also appears when the elapsed time from the preparation of the dough-like detergent composition to the application becomes long. The change over time in the flow stability of the dough-like detergent composition is presumed to be due to the aggregation of the solid particles contained and the oil absorption effect of the solid particles on the liquid component. On the other hand, in order to continuously and stably form a thin layer using a coating method, it is essential that the flow characteristics of the dough-like detergent composition are stable. However, in the thin layer forming process using the coating method, the liquid feeding operation by the pump, the flow in the pipe, the stay in the liquid reservoir, the deformation in the thin layer forming part, and the start / end of the thin layer forming process itself A wide shear rate handling the dough-like detergent composition, such as operation, tends to destabilize thin layer formation. In addition, the time required for unit operations such as mixing, feeding, and storage that occurs in the step of preparing the dough-like detergent composition varies in the time from preparation of the dough-like detergent composition to application. It acts unavoidably in the direction of destabilizing the thin layer formation. Accordingly, in order to continuously and stably form a thin layer using the coating method, the flow characteristics of the dough-like detergent composition maintain linearity in a wide shear rate range, and the dough-like detergent composition It is important that the coating is performed in a stable state in which no change with time has yet occurred. However, typical indices representing the flow characteristics of the solid-liquid dispersion system such as viscosity and thixo index cannot grasp the stability of the flow characteristics of the dough-like detergent composition. As a result of various investigations, the present inventors have found that the stability of the flow characteristics of the dough-like detergent composition can be expressed by the above formula (1) plastic flow index BF. It was found that the thin layer forming step may be completed while keeping it.
[0021]
The plastic flow index BF relates to the relationship between the viscosity η and the shear rate τ of the dough-like detergent composition. Specifically, in the relationship between the logarithmic value of the viscosity η and the logarithmic value of the shear rate τ, the shear rate τ is 1-10s^-1The slope Dη of the viscosity η in the range of₁ The shear rate τ is 10 to 100 s^-1The slope Dη of the viscosity η in the range of₂ It represents the rate of change. The smaller the rate of change, the shear rate τ is 1 to 100 s.^-1In this range, the relationship between log τ and log η approaches a straight line. This means that the flow characteristics of the dough-like detergent composition are uniform over a wide range of shear rates. When the investigation was further promoted, the dough-like detergent composition was formed into a thin layer under the condition that the value of the plastic flow index BF represented by the formula (1) was 6 or less, so that the solid composition was solid at a high ratio. It has been found that a dough-like detergent composition containing particle components can be stably formed into a thin layer, and quality variation can be minimized in the thin layer forming process, and further sufficient cleaning performance can be demonstrated. It was.
[0022]
Specifically, when the plastic flow index BF of the dough-like detergent composition is more than 6 when forming the thin layer, the liquid flow rate by the pump becomes unstable and the widthwise dimension of the thin layer varies. . Furthermore, since the pressure distribution in the width direction in the coating apparatus is not uniform, the height dimension of the thin layer is not uniform in the width direction. In addition, agglomerates are likely to be generated in the staying portion in the pipe, and thin layer scumming and tearing are likely to occur in the thin layer forming portion. Therefore, by applying the dough-like detergent composition within the time when the value of the plastic flow index BF is 6 or less, the width direction dimension and the height direction dimension of the formed thin layer become uniform. Aggregates are prevented from being generated, and thin layer blurring and tearing at the thin film forming portion can be prevented. Further, in order to improve the cleaning performance of the resulting sheet-like laundry product, it is necessary to contain a powder composition such as solid detergent particles at a high ratio in the dough-like detergent composition, but the plastic properties are By ending application of the dough-like detergent composition in a weak state, it is possible to reduce the variation in fluidity of the dough-like detergent composition, so that more powder composition can be contained in the preparation stage. It is possible to improve the cleaning performance of the sheet-like laundry article.
[0023]
When the value of the plastic flow index BF is 4.5 or less, particularly 3 or less, the above-described effect becomes more remarkable, which is preferable. As apparent from the above description and the formula (1), the value of the plastic flow index BF is most preferably 0.
[0024]
The value of the plastic flow index BF changes as time elapses after the dough-like detergent composition is prepared. In the present invention, while the value of the plastic flow index BF is 6 or less, The formation of a thin layer of detergent-like detergent composition is completed.
[0025]
The dough-like detergent composition has a Dη in the formula (1).₁The value of 0.95 or less, particularly 0.9 or less, especially 0.85 or less, is formed in a thin layer, which facilitates liquid feeding using a transport means such as a pump. It is preferable from the point that a chigile or foam bite is prevented. Dη₁The smaller the value, the better. However, the lower limit is about 0.5.
[0026]
Furthermore, the dough-like detergent composition has a Dη in the formula (1).₂The leveling property of the dough-like detergent composition after coating is improved when it is formed in a thin layer under the condition that the value is 0.95 or less, particularly 0.9 or less, particularly 0.88 or less. In view of improving the smoothness of the upper surface of the thin layer, it is preferable. Dη₂The smaller the value, the better. However, the lower limit is about 0.5.
[0027]
The value of the plastic flow index BF is measured as follows. For example, a rotary viscometer Rotovisco RV20 manufactured by Haake is equipped with a double cylindrical test fixture having an inner diameter of 19.3 mm, an outer diameter of 23.1 mm, and an overall length of 32.0 mm, and this is loaded with a dough-like detergent composition. And keep the temperature of the dough-like detergent composition at 80 ° C. In manufacturing sheet-like laundry products, the shear rate is 1 to 1 s depending on the location of the piping.^-1Therefore, paying attention to the change, the dough-like detergent composition kept in the above state was subjected to shear rate γ100s.^-1The viscosity curve of the dough-like detergent composition representing the relationship of viscosity η to γ is obtained. The shear rate 1 s obtained in the process of increasing and decreasing the shear rate γ^-110s^-1, 100s^-1Plastic flow index BF in the ascending process and descending process using the viscosity η (1), η (10), η (100)_UP, BF_DOWNFind the values of. And the average value is calculated and the value of the plastic flow index BF is obtained.
[0028]
The shear rate γ given when measuring the viscosity η is applied from the supply source in the actual coating apparatus in consideration of the minimum stabilization time, measurement time, and number of measurement points necessary to ensure the reproducibility of the measurement. It is desirable that the shear history given to the dough-like detergent composition is representative, for example, 1 s under the condition that the time required for changing γ is 6 s and the time for maintaining γ is 10 s.^-1→ 3.2s^-1→ 10s^-1→ 32s^-1→ 100s^-1→ 32s^-1→ 10s^-1→ 3.2s^-1→ 1s^-1And changed sequentially.
[0029]
In addition to forming a thin layer under the condition where the value of the plastic flow index BF is equal to or less than the above-mentioned value, the dough-like detergent composition has a thixo flow index TR represented by the following formula (2). Forming the thin layer under a condition where the value is 60 or less, particularly 40 or less, particularly 30 or less, makes it possible to form a dough-like detergent composition containing a solid particle component at a high ratio in a more stable thin layer. In addition, it is preferable from the standpoint that quality variations can be further minimized in the thin layer forming process, and further sufficient cleaning performance can be exhibited. The thixofluid index TR is most preferably 0.
[0030]
[Expression 4]
[0031]
The thixotropy index TR represents a thixotropy related to the viscosity of the dough-like detergent composition. The viscosity curve is measured when the shear rate is increased, and the viscosity curve is measured when the shear rate is decreased. And the value of the thixotropy index TR approaches 0.
[0032]
The value of the thixotropy index TR is measured as follows. For example, a rotary viscometer Rotovisco RV20 manufactured by Haake is equipped with a double cylindrical test fixture having an inner diameter of 19.3 mm, an outer diameter of 23.1 mm, and an overall length of 32.0 mm, and this is loaded with a dough-like detergent composition. The temperature of the dough-like detergent composition is kept at 80 ° C. In the manufacture of sheet-like laundry products, the shear rate is 1 to 100 s depending on the location of the piping.^-1Therefore, paying attention to the difference in viscosity corresponding to the change, the dough-like detergent composition kept in the above state is treated with a shear rate γ100 s.^-11s in each of the ascending process and descending process^-1Viscosity η obtained by (1)_UP, Η (1)_DOWNAnd 10s^-1Viscosity η obtained by (10)_UP, Η (10)_DOWNIs used to obtain the value of the thixotropy index TR using the formula (2).
[0033]
The shear rate γ applied when measuring the viscosity η was changed in the same manner as the measurement of the plastic flow index BF.
[0034]
The dough detergent composition has a shear rate of 10 s.^-1It is possible to use those prepared so that the viscosity of the thin layer 17 is 10,000 mPa · s to 100,000 mPa · s, particularly 15,000 mPa · s to 80,000 mPa · s. This is preferable from the viewpoint that the shape retention is good, the continuous and stable thin layer 17 can be formed without causing defects such as bubbles, and the liquid feeding using a transporting means such as a pump becomes easy.
[0035]
In order to form the dough-like detergent composition into a thin layer, the shear rate is 10 s.^-1~ 1000s^-1It is preferable to use conditions that satisfy the above conditions in that the thin layer can be stably formed. For example, in this embodiment, when the dough detergent composition is applied onto the flexible support 14 by the die coater 13, the shear rate of the dough detergent composition is 10 s as the application condition.^-1~ 1000s^-1It is preferable to perform coating by adjusting the supply rate of the dough-like detergent composition so that The shear rate when the dough-like detergent composition is applied onto the flexible support 14 by the die coater 13 is represented by the following formula (3).
[0036]
[Equation 5]
[0037]
When the dough-like detergent composition is applied onto the flexible support 14 by the die coater 13, the shear rate is set to 10 s.^-1By setting it as the above, a bead shape is stably hold | maintained at a back edge surface, and coating-film defects, such as a coating stripe by the bead shape breakage, are prevented. Also, the shear rate is 1000s^-1By setting it as the following, the entrainment of the air at the time of the bead formation in a back edge surface, and coating-film defects, such as coating film missing, are prevented. The shear rate is 20 s^-1~ 900s^-1, Especially 50s^-1~ 700s^-1It is preferable to carry out the coating under the above conditions from the viewpoint of preventing coating stripes and coating film removal.
[0038]
  As described above, the shear rate when the dough-like detergent composition is applied onto the flexible support 14 by the die coater 13 is determined from the running speed of the flexible support 14 and the thickness of the thin layer 17. . In this case, the running speed U of the flexible support 14 isFrom the viewpoints of both the stability of the coating due to the suppression of coating streaks, coating film leakage, etc. and the solubility and productivity of the flexible support 14 at the time of use,5m / min to 100m / minAnd preferably10 m / min to 80 m / minTo. On the other hand, the thickness of the thin layer 17 is in the range of 0.5 mm to 10 mm, particularly 1.0 mm to 5.0 mm, and more preferably 1.5 mm to 3.5 mm. It is preferable from the viewpoints of both the ease of use of the sheet-like laundry product derived from the solubility, the cleanability, the size and the shape of the flexible support 14, and the economical efficiency.
[0039]
In the case where the thin layer 17 is formed discontinuously along the longitudinal direction of the flexible support 17, the die coater 13 is moved toward and away from the flexible support 14 in the above embodiment. Instead, the die coater 13 is fixed at a position close to the flexible support 14, and a shutter is disposed on the die coater 13, and the dough-like detergent composition is intermittently applied by opening and closing the shutter. May be.
[0042]
When the dough-like detergent composition is formed into a thin layer at 100 ° C. or less, particularly 60 to 100 ° C., the composition changes due to evaporation of the detergent components over time, or chemical alteration due to high temperature occurs. It is preferable from the point which can prevent. For example, in the present embodiment, when the dough-like detergent composition is applied onto the flexible support 14 by the die coater 13, the temperature of the dough-like detergent composition is 100 ° C. or less as the application condition. It is preferable to adjust the temperature of the dough-like detergent composition so that
[0043]
A thin layer 17 is formed on the flexible support 14 to obtain a sheet-like laundry article as the object. Thereafter, a second flexible support made of the same material as or different from the flexible support 14 is superposed on the upper surface of the thin layer 17 as necessary, and the thin layer 17 is formed by two flexible supports. It may be a sheet-like laundry article coated on both sides.
[0044]
A long sheet-like laundry article in which the thin layer 17 is formed on the flexible support 14, or a long sheet-like laundry article in which the flexible support is arranged on both surfaces of the thin layer 17. May be cut in the width direction to form a sheet-like laundry article for each leaf. When the thin layer 17 is formed discontinuously over the longitudinal direction of the flexible support 14, it is preferable to cut at the discontinuous portion.
[0045]
Further, when the sheet-like laundry article is composed of a thin layer 17 and two flexible supports sandwiching the thin layer 17, and there are uncoated portions on both sides of the flexible support. Even when the sheet-like laundry article is in a long shape before cutting or in a state of every leaf after cutting, the flexible support is joined by a predetermined joining means to prevent the thin layer 17 from falling off. Good.
[0046]
Examples of the long belt-like flexible support 14 to which the dough-like detergent composition is applied include flexible sheets and webs, for example, synthetic resin films and fiber sheets such as woven and non-woven fabrics. Used. The flexible support 14 is preferably water-soluble or water-dispersible. When the flexible support 14 is water-soluble, the material constituting the flexible support 14 is, for example, (1) water-soluble described in JP-A-10-204499, column 12, lines 16 to 33. A film, (2) a nonwoven fabric or woven fabric made of water-soluble polymer fibers, or (3) a laminated sheet of a nonwoven fabric or woven fabric made of water-soluble polymer fibers and water-soluble polymer fibers are preferred. These flexible supports are composed of water-soluble polymers. Specifically, polyvinyl alcohol, polyvinyl pyrrolidone, pullulan, polyacrylamide, polyethylene oxide, polyvinyl methylene ether, xanthan gum, gar gum, collagen, carboxymethyl cellulose, hydroxypropyl cellulose and hydroxyethyl cellulose, polyacrylic acid or a salt thereof, polymethacryl Examples thereof include organic polymers having a carboxyl group and / or sulfonic acid group such as acid or a salt thereof, polyitaconic acid or a salt thereof, and / or a salt thereof. Particularly preferred is polyvinyl alcohol or polyvinyl alcohol modified with maleic acid or itaconic acid. .
[0047]
The rheological properties of the dough-like detergent composition are as described above, and the blending composition is as follows. The dough-like detergent composition contains at least one surfactant, an alkali agent and a metal ion scavenger.
[0048]
As the surfactant, a nonionic surfactant and an anionic surfactant are preferable. Examples of the nonionic surfactant include those described in JP-A-10-204499, column 5, lines 6 to 31 and the like, and in particular, a linear or branched primary or branched chain having 10 to 18 carbon atoms. Polyoxyalkylene in which an alkylene oxide such as ethylene oxide or propylene oxide is added to a secondary alcohol so that the HLB value (calculated by the Griffin method) is 10.5 to 15.0, particularly 11.0 to 14.5. Alkyl ethers are preferred. Examples of the anionic surfactant include those described in JP-A No. 10-204499, column 5, lines 39 to 49, and the like. In particular, alkyl sulfates having 12 to 18 carbon atoms and alkyl chains. A linear alkylbenzene sulfonate having 10 to 14 carbon atoms is preferable, and alkali metals, particularly sodium and potassium are preferable as a counter ion. The content of the surfactant is preferably 5 to 80% by weight, more preferably 20 to 60% by weight in the dough-like detergent composition in terms of detergency. A combination of a nonionic surfactant and an anionic surfactant is also preferred. In this case, the total amount of both is 50 to 100% by weight, particularly 70 to 100% by weight in the surfactant. Is preferable. The weight ratio of the nonionic surfactant to the anionic surfactant is, in terms of solubility, nonionic surfactant / anionic surfactant = 100/0 to 10/90, particularly 90/10 to 50. / 50 is preferred.
[0049]
Examples of the alkali agent include those described in JP-A-10-204499, from column 5 end to column 6, line 9 and the like, particularly sodium carbonate, potassium carbonate, amorphous silicate and crystalline silicic acid. Salts are preferred.
[0050]
Examples of the metal ion scavenger include those described in JP-A No. 10-204499, column 8, lines 41 to 47, and in particular, crystalline aluminosilicate (zeolite), amorphous aluminosilicate, organic Chelating agents and polycarboxylic acid polymers, particularly sodium polyacrylate and maleic acrylate copolymers are preferred.
[0051]
  The dough-like detergent composition contains 5 to 50 wts of the surfactant.Including%YesTo do. Also,The alkali agent is preferably contained in an amount of 5 to 60% by weight, particularly 10 to 50% by weight, and the metal ion scavenger is preferably contained in an amount of 5 to 60% by weight, particularly 10 to 50% by weight.
[0052]
In terms of maintaining the fluidity of the dough-like detergent composition and preventing the leakage of the cleaning active substance in the dough-like detergent composition through the flexible support 14, the dough-like detergent composition has It is preferable to adjust the mixing ratio of the organic compound and inorganic compound contained. A preferable mixing ratio of the organic compound and the inorganic compound is organic compound / inorganic compound = 80/20 to 10/90, particularly 70/30 to 15/85 (weight ratio).
[0054]
【Example】
Hereinafter, the present invention will be described in more detail with reference to examples. Unless otherwise specified, “%” and “part” mean “% by weight” and “part by weight”, respectively.
Prior to Examples, a method for preparing a dough-like detergent composition (Preparation Examples 1 to 3) will be described.
[0055]
[Method for preparing dough-like detergent composition]
Preparation Example 1 (compositions of Example 1 and Comparative Example 6)
A slurry having a water content of 50% containing zeolite, sodium carbonate, sodium nitrate, sodium sulfite, polyacrylic acid soda and fluorescent dye in the ratios shown in Table 1 was dried by a spray drying method, and the following dry particles 1 (average particle size of about 250 μm) was obtained. Details of each component in Table 1 are as shown in Table 2.
[0056]
[Dry particle 1 composition]
・ Zeolite 33.7 parts
・ Soda carbonate 9.1 parts
・ 4.6 parts of mirabilite
・ Sodium sulfite 0.5 parts
・ 4.6 parts of sodium polyacrylate
・ 0.4 parts of fluorescent dye
・ Residual moisture 1.3 parts
[0057]
11.44 kg of nonionic surfactant and 0.82 kg of sodium laurate are placed in a 50 liter batch kneader (1600-65CVJA-3.7 type, manufactured by Satake Chemical Machinery Co., Ltd.), and lauric acid is heated at 65 ° C. Mix until the sodium is melted and uniform. Next, 0.34 kg of 48% NaOHaq was gradually added at the same time while continuing stirring, and the stirring was further continued for 10 minutes to sufficiently carry out the neutralization reaction. After completion of the reaction, 17.12 kg of dry particles are added, mixed for about 5 minutes until homogeneous, 0.27 kg of enzyme and 0.15 kg of fragrance are added and further mixed for 2 minutes to form a dough shape as shown in Example 1. Detergent mixture 1 was obtained.
[0058]
Preparation Example 2 (compositions of Example 2 and Comparative Examples 1-3, 5)
9.02 kg of nonionic surfactant and 0.27 kg of PEG were placed in a 50 liter batch kneader (manufactured by Satake Chemical Machinery Co., Ltd., 1600-65CVJA-3.7 type) and mixed under heating at 65 ° C. Then add 1.80 kg of AS-Na powder and 18.61 kg of dry particles, mix for about 5 minutes until homogeneous, add 0.29 kg of enzyme and 0.15 kg of fragrance and mix for another 2 minutes, A dough-like detergent mixture 2 shown in Example 2, Comparative Example 1, and Comparative Example 2 was obtained.
[0059]
Preparation Example 3 (compositions of Example 3 and Comparative Example 4)
7.45 kg of nonionic surfactant and 0.34 kg of sodium laurate were placed in a 50 L batch kneader (manufactured by Satake Chemical Machinery Co., Ltd., 1600-65CVJA-3.7 type) and heated at 65 ° C., sodium laurate Until melted and uniform. Next, 2.79 kg of alkylbenzene sulfonic acid and 0.86 kg of 48% NaOHaq were gradually added at the same time while continuing the stirring, and the stirring was further continued for 10 minutes to sufficiently carry out the neutralization reaction. After completion of the reaction, 18.26 kg of dry particles are added, mixed for about 5 minutes until homogeneous, 0.30 kg of enzyme and 0.15 kg of fragrance are added and further mixed for 2 minutes to form a dough shape as shown in Example 1. Detergent mixture 3 was obtained.
[0060]
[Measurement method of viscosity]
About each dough-like detergent composition obtained by each preparation example, the viscosity was measured with the following method. The results are shown in Table 1.
A double viscometer test fixture having an inner diameter of 19.3 mm, an outer diameter of 23.1 mm, and an overall length of 32.0 mm is attached to a rotary viscometer Roto Visco RV20 manufactured by Haake, and this is loaded with a dough-like detergent composition. Conditions in which the temperature of the dough-like detergent composition is maintained at 80 ° C., the time required for changing the shear rate γ is 6 s, the time for maintaining γ is 5 s, and the viscosity η is measured while maintaining γ for 5 s And γ is 1s^-1→ 3.2s^-1→ 10s^-1The viscosity was measured by calculating an average value of 10 measured values of η obtained at intervals of 0.5 s during the time of measuring η.
[0061]
    [Examples 1-3 and Comparative Examples 1-3]
  Weight per unit area (basis weight) 20 g / m prepared according to Example 2 of JP-A-8-3848²Each dough-like detergent composition obtained in each preparation example is displayed on a water-soluble film in a laminated sheet obtained by laminating a water-soluble non-woven fabric and “Hi-Selon” (water-soluble film) manufactured by Nippon Synthetic Chemical Industry Co., Ltd. After the elapse of the time shown in FIG. 1, coating was performed using the production apparatus shown in FIG. 1 under the conditions of shear rate and temperature shown in the same table. The plastic flow index BF and thixoflow index TR of the dough-like detergent composition at the time of coating were as shown in Table 1. The laminated sheet was overlaid on the coated dough-like detergent composition so that the water-soluble nonwoven fabric was the outermost layer. Subsequently, the periphery of the laminated sheet was heat-sealed with FUJI IMPULSE AUTO SEALER (FA-600-5) to obtain a sheet-like laundry product. The applied dough-like detergent composition had a thickness of 2 mm and a rectangular shape of 7 cm × 6.5 cm.
[0062]
[Performance evaluation]
About the sheet-like laundry goods obtained by each Example and the comparative example, coating property, shape retention property, solubility, and washing | cleaning property were evaluated with the following method. The results are shown in Table 1.
[0063]
[Evaluation method of coatability]
Using the die coater, a shear rate of 10 to 1000 s^-1The dough-like detergent composition was respectively applied on the flexible support under the various application conditions, and the obtained thin layer was observed according to the following criteria.
◯: Both the longitudinal direction and the width direction have a uniform thickness. There are almost no defects such as bubbles.
Δ: The thickness in the longitudinal direction and the width direction varies. Defects such as small bubbles are always recognized, and defects such as large bubbles may be recognized.
X: Film breakage occurs in the longitudinal direction and the width direction. Defects such as large bubbles are always recognized.
[0064]
[Method for evaluating solubility]
The obtained sheet-like laundry article was cut into a square of 10 cm on a side and put into a washing machine [manufactured by Toshiba Corporation, Galaxy 3.6 (VH360S1 type)] containing 30 liters of tap water at 5 ° C. Immediately start stirring with “strong rotation”, 3 minutes and 15 minutes after the start of stirring, using a 10 ml syringe equipped with a disposable membrane filter unit 25AS020AN (pore size 0.20 micron) manufactured by Toyo Roshi Kaisha, Ltd. at the tip. The washing water was promptly filtered and the filtrate was sampled. The tap water used for the evaluation, and the filtrates after 3 minutes and 15 minutes were returned to room temperature, and then the electricity of each liquid was measured using an electric conductivity meter (CM-60V type) manufactured by Toa Denpa Kogyo Co., Ltd. Conductivity was measured. The dissolution rate was calculated from the following formula (5), and the solubility was evaluated according to the following criteria.
[0065]
[Expression 7]
[0066]
A: Dissolution rate 80% or more
○: Dissolution rate of 75% or more and less than 80%
Δ: Dissolution rate 70% or more and less than 75%
×: Less than 70% dissolution rate
[0067]
[Evaluation method for detergency]
(1) Adjustment of artificially contaminated cloth
An artificially contaminated cloth was prepared by printing an artificially contaminated liquid having the following composition on the cloth using a gravure roll coater. Gravure printing condition is gravure roll cell capacity 58cm^Three/ Cm²The coating speed was 1.0 m / min, the drying temperature was 100 ° C., and the drying time was 1 hour. As the cloth, a cotton gold cloth 2003 cloth (manufactured by Tanigami Shoten) was used.
[0068]
Composition of artificial contamination
Lauric acid 0.44%
Myristic acid 3.09%
Pentadecanoic acid 2.31%
Palmitic acid 6.18%
Heptadecanoic acid 0.44%
Stearic acid 1.57%
Oleic acid 7.75%
Trioleic acid 13.06%
N-Hexadecyl palmitate 2.18%
Squalene 6.53%
Egg white lecithin liquid crystal 1.94%
Kanuma red soil 8.11%
Carbon black 0.01%
Tap water balance
[0069]
(2) Cleaning conditions and evaluation method
Five 1 cm × 10 cm artificially contaminated fabrics prepared as described above were placed in 1 liter of an aqueous detergent solution for evaluation, and washed with a targotometer at 100 rpm. The cleaning conditions are as follows.
Washing time 10 minutes
Detergent concentration 0.0005
Water hardness 4 ° DH
Water temperature 20 ℃
Rinse for 5 minutes with tap water
[0070]
The detergency was measured with a self-recording colorimeter (manufactured by Shimadzu Corporation) at a reflectance of 550 nm of the raw cloth before contamination and the contaminated cloth before and after cleaning. Determination was made according to the following criteria using the measured average value.
[0071]
[Equation 8]
[0072]
A: 60% or more
○: 55% or more and less than 60%
Δ: 50% or more and less than 55%
×: Less than 50%
[0073]
[Table 1]
[0074]
[Table 2]
[0075]
As is apparent from the results shown in Table 1, when the dough-like detergent composition is applied under the conditions of each example, both the longitudinal direction and the width direction have a uniform thickness, and no defects such as bubbles are observed. It can be seen that a thin layer can be obtained. Also, in the evaluation of solubility, it can be seen that almost no residue of the detergent composition is observed, and the solubility is good. Furthermore, it can be seen that a sufficiently high detergency is also exhibited.
[0076]
【The invention's effect】
According to the method for producing a sheet-like laundry article of the present invention, a thin layer composed of a dough-like detergent composition is formed with a uniform thickness without causing defects such as bubbles while maintaining high detergency and solubility. And width.
[Brief description of the drawings]
FIG. 1 is a schematic view showing a main part of a production apparatus preferably used in a method for producing a sheet-like laundry article of the present invention.
[Explanation of symbols]
10 Manufacturing equipment
11, 11 'roll
12 Endless belt
13 Die coater
14 Flexible support
15 Guide roll
16 Nip roll
17 Thin layer

Claims (10)

A surfactant, an alkali agent and a metal ion capturing agent contains one or more, respectively, the content of the surfactant is doughy detergent composition Ru 5-50 wt% der, represented by the following formula (1) Manufacture of a sheet-like laundry article that is formed into a thin layer by coating with a die coater on a flexible support traveling at 5 to 100 m / min under the condition that the plastic flow index BF is 6 or less Method.
(However, (a) a dough-like detergent composition prepared so that the viscosity at a shear rate of 10 s ^{-1 to} 1,000 s ^-1 is 1,000 mPa · s to 50,000 mPa · s is continuously run in a predetermined direction. The dough-like detergent composition is coated on a long belt-like flexible support to be continuously or discontinuously by a predetermined coating means under a shear rate of 10 s ^{-1 to} 1,000 s ^-1 . A method for producing a sheet-like laundry article forming a thin layer of
(B) The viscosity at a shear rate of 10 s ⁻¹ is 3,000 mPa · s to 300,000 mPa · s and the viscosity at 1,000 s ⁻¹ is 60 mPa · s to 20,000 mPa · s, and The coefficient C ₀ in the Casson equation represented by And C ₁ 7 <C ₀ each <40 and 0.5 <C ₁ <3 The dough-like detergent composition prepared so as to be 3 is placed on a long belt-like flexible support continuously running in a predetermined direction under a condition of a shear rate of 10 s ^{−1 to} 1,000 s ^−1. A method for producing a sheet-like laundry article, which is applied continuously or discontinuously by the coating means to form a thin layer of the dough-like detergent composition, and
(C) A dough-like detergent containing at least one surfactant, an alkali agent, and a metal ion scavenger, and having a viscosity at a shear rate of 10 s ⁻¹ of 10,000 mPa · s to 100,000 mPa · s. The composition is applied in a state where the value of the thixofluidic index TR represented by the following formula is 60 or less, and the method for producing a sheet-like laundry article formed into a thin layer is excluded. )
The manufacturing method of the sheet-like laundry article of Claim 1 which forms the said dough-shaped detergent composition in the said thin layer under the state whose value of said (Deta) ₁ is 0.95 or less. The manufacturing method of the sheet-like laundry article of Claim 1 or 2 which forms the said dough-shaped detergent composition in the said thin layer under the state whose value of said (Deta) ₂ is 0.95 or less. The said dough-like detergent composition is formed in the said thin layer in the state whose value of the thixotropy index TR represented by the following formula | equation (2) is 60 or less. Manufacturing method for sheet-like laundry products.
The sheet-shaped laundry article according to any one of claims 1 to 4, wherein the dough-like detergent composition prepared so that the viscosity at a shear rate of 10 s ^-1 is 10,000 mPa · s to 100,000 mPa · s. Production method. The doughy detergent composition, under the conditions of a shear rate of 10s ^-1 ~1000s ^-1, sheet-like washing article manufacturing method according to any one of claims 1 to 5 formed on the thin layer.   The method for producing a sheet-like laundry article according to any one of claims 1 to 6, wherein the thin layer has a thickness of 0.5 mm to 10 mm.   The manufacturing method of the sheet-like laundry article in any one of Claims 1-7 which forms the said dough-like detergent composition in the said thin layer at 100 degrees C or less.   The dough-like detergent composition is continuously or discontinuously applied by a predetermined application means on a long belt-like water-soluble or water-dispersible flexible support continuously running in a predetermined direction, The manufacturing method of the sheet-like laundry article in any one of Claims 1-8 which forms the said thin layer.   The method for producing a sheet-like laundry article according to claim 9, wherein after the thin layer is formed, both surfaces of the thin layer are covered by further overlapping a flexible support on the upper surface of the thin layer.