JP6204932B2 - Evaluation method for sliminess of liquid preparations - Google Patents

Description

  The present invention relates to a method for evaluating the sliminess of a liquid preparation and a device for evaluating the slimness used in the evaluation method.

  The sliminess is deeply related to the feeling of use and palatability of liquid preparations such as lotions, emulsions and creams. However, the conventional evaluation of the strength of the luster is based on the sensory evaluation by the panelists, and the development of an evaluation method that enables more objective evaluation has been demanded.

  Needless to say, slipperiness is included in the strength of the sliminess. The degree of slipping can be evaluated by the friction coefficient, and the friction coefficient can be measured using a normal friction tester. However, for example, a frozen road surface will not feel slippery even if it feels slipping. In the same way, even if the friction coefficient of the surface to which the liquid is applied is measured using a friction tester and the slippery liquid can be selected by the friction coefficient level, the slippery liquid is slippery. Therefore, it is difficult to properly discriminate the strength of the liquid with only the evaluation of the slipperiness of the liquid.

  In addition, as a method for evaluating the stickiness focusing on physical properties other than slip, methods for measuring and evaluating physical property parameters based on hardness and viscoelasticity have been proposed (Patent Documents 1 and 2). In the evaluation method of Patent Document 1, the function evaluation for evaluating the hardness of a complex fluid set in advance from the flow characteristics of the thickener is used to quantify the sensory evaluation at the time of application of the thickener. For example, the strength of sliminess is evaluated as usability. In the evaluation method of Patent Document 2, the rheometer used for measuring the viscoelasticity of an object is used to measure the angular frequency dependence of the loss tangent tan δ for the cosmetic to be evaluated, and at a predetermined angular frequency. Based on the loss tangent tan δ, the degree of luster when the cosmetic is applied to the skin is evaluated.

JP 2010-122170 A JP 2012-47667 A

  However, although the above-mentioned conventional methods for evaluating sliminess evaluate one aspect of the strength and weakness of the sliminess, it is not sufficient for comprehensive and objective evaluation. Therefore, it is desired to develop a new technology that enables evaluation.

  It is an object of the present invention to provide a method for evaluating the sliminess of a liquid preparation, which can comprehensively and objectively evaluate the strength of the liquid formulation, and a sliminess evaluation apparatus used in the evaluation method. To do.

  As a result of considering the formation of the sliminess, the present inventor has found that the sliminess has characteristics different from a simple slip. That is, firstly, the slippery is accompanied by slipping, but it does not just feel slippery, but it loses the clue of contact, or slips when trying to grab the contacted object. It is thought to feel greasy when accompanied by a sensation that prevents direct contact with the body. Secondly, in connection with this, the sense of clinging to the hand or finger trying to come into contact with the contacted object (or the sensation of sticky things such as mucus on the surface) is applied to the sliminess. It will be accompanied.

  Therefore, the present inventor does not use a method of evaluating the strength of the sliminess by sliding the sensor on the surface to which the liquid preparation has been applied, as in the conventional friction test. The method of detecting the contribution of the adhesive property of the liquid at the same time as the slipperiness (hardness to stop) by using a method that focuses on the motion), and arrived at the present invention It is.

  The present invention provides a liquid preparation by using an evaluation device including a driving roll that is rotated by a driving device and a free rotating roll that rotates in contact with the driving roller, the rotating shafts being arranged in parallel. An evaluation method for evaluating the strength of adhesion, wherein the rotation of the free rotating roll is performed when the liquid preparation is supplied to the entire nip portion between the driving roll and the free rotating roll while rotating the driving roll. The present invention provides a method for evaluating the wetness of a liquid preparation, which evaluates the strength of the liquid preparation from the change in speed.

  Further, the present invention is a slimy evaluation device used in the method for evaluating the sliminess of the liquid preparation, which is provided with a rotating shaft arranged in parallel, a driving roll rotated by a driving device, and a contact with the driving roll And a free rotating roll that rotates and includes a speed sensor that detects the rotational speed of the free rotating roll.

  According to the method for evaluating the sliminess of the liquid preparation of the present invention or the apparatus for evaluating the sliminess used in the evaluation method, the strength and weakness of the liquid preparation can be appropriately evaluated comprehensively and objectively.

FIG. 1A and FIG. 1B are schematic perspective views illustrating a schematic configuration of a slimy evaluation device used in a slimy evaluation method according to a preferred embodiment of the present invention. FIG. 2 is a chart illustrating the change in the rotational speed of the free rotating roll when lotion is supplied to the nip portion as a test object. FIG. 3 is a chart illustrating a correlation between an attenuation gradient, which is a change in the rotational speed of a free rotating roll measured using lotion as a test object, and a sensory evaluation of the absence of skin lotion.

Hereinafter, the evaluation method of the sliminess of the liquid formulation of this invention and the evaluation apparatus of a sliminess are demonstrated based on the preferable embodiment.
A slimy evaluation method according to a preferred embodiment of the present invention is performed by a driving device (not shown) provided with rotating shafts 11a and 12a arranged in parallel as shown in FIG. It implements using the evaluation apparatus 10 of the sliminess provided with the speed sensor 13 which contains the drive roll 11 which rotates, and the free rotation roll 12 which rotates in contact with the drive roll 11, and detects the rotational speed of the free rotation roll 12. be able to. Such a sliminess evaluation apparatus 10 can be used by appropriately modifying an incometer, which is known as an apparatus used for evaluating the tackiness of printing ink, for example.

  And the evaluation method of the sliminess of the liquid formulation of this embodiment is the contact with the drive roll 11 which rotates with the drive device (not shown) provided by arrange | positioning the rotating shafts 11a and 12a in parallel, and the drive roll 11. An evaluation method for evaluating, for example, the strength of a skin lotion as a liquid preparation using an evaluation device 10 including a rotating free rotating roll 12 and rotating the driving roll 11 while freely rotating the driving roll 11 The strength of the liquid formulation is evaluated from the change in the rotational speed of the free rotation roll 12 when the liquid formulation is supplied to the entire nip portion 14 between the rotary roll 12.

  In the measuring apparatus 10 used in the evaluation method for sliminess according to the present embodiment, the drive roll 11 and the free rotating roll 12 have a frame (not shown) of the measuring apparatus 10 whose shaft portions 11a and 12a are connected via hinges or arms. Attached). The driving roll 11 and the free rotating roll 12 have their rotating shafts 11a and 12a arranged in parallel to each other, and the load of the free rotating roll 12 is brought into contact with the driving roll 11 and the free rotating roll 12 to be evaluated. It is a structure added to the nip part 14 which is a part which pinches | interposes a certain liquid formulation. The free rotating roll 12 rotates with the rotation of the driving roll 11 by the action of a frictional force caused by contact with the driving roll 11 at the nip portion 14.

  Here, the load applied to the nip portion 14 can be adjusted so that a load greater than the weight of the free rotating roll 12 is applied by applying a load to the shaft portion 12a of the free rotating roll 12, for example. Further, for example, by using a pressing mechanism by a spring member such as a spring, by applying a load from the lateral direction, the positional relationship between the driving roll 11 and the free rotating roll 12 includes, for example, these shaft portions 11a and 12a. It can also be arranged such that the plane is horizontal.

  A metal roll member can be used for the drive roll 11, while a rubber roll member can be used for the free rotation roll 12. Further, both the drive roll 11 and the free rotating roll 12 can be rubber roll members. Alternatively, the drive roll 11 and the free rotating roll 12 can be formed by selecting a wide range of materials from, for example, nylon and other various resins.

  The drive roll 11 preferably has a diameter of about 50 to 120 mm, for example, and preferably has a length of about 50 to 250 mm. The free rotating roll 12 also preferably has a diameter of about 50 to 120 mm, for example, and preferably has a length of about 50 to 250 mm. The free rotating roll 12 may be shorter than the driving roll 11 or vice versa.

  As shown in FIG. 1B, the measuring apparatus 10 is a film thickness control roll 15 for uniformly and thinly spreading the liquid preparation as the evaluation object supplied to the surface of the drive roll 11 as a third roll. You may have. The film thickness control roll 15 can be preferably formed as a rubber roll member, similarly to the free rotating roll 12, and can be formed by selecting a wide range of materials from, for example, nylon and other various resins. The film thickness control roll 15 preferably has a diameter smaller than the diameter of the drive roll 11, for example, about 35 to 80 mm.

  When the film thickness control roll 15 is provided as the third roll, a general vibration operation can be omitted in the incometer, and the position of the film thickness control roll 15 can be fixed. In addition, concave grooves 11b and 15b that are continuous over the entire circumference in the circumferential direction are formed in both end portions of the drive roll 11 and the film thickness control roll 15 whose positions are fixed, respectively, and a pair of concave grooves 11b and 15b on both sides are formed. The regions between these sandwiched between the liquid preparation supply regions 11c and 15c, respectively, and the regions outside the pair of concave grooves 11b and 15b at both ends are the driving force transmission regions 11d and 15d, respectively. You can also.

  As a result, the liquid preparation supplied to the liquid preparation supply region 11 c of the drive roll 11 protrudes beyond the concave groove 11 b of the drive roll 11 to the drive force transmission region 11 d or exceeds the concave groove 15 b of the film thickness control roll 15. Thus, it is possible to effectively avoid the protrusion to the driving force transmission region 15d. Further, for example, even if the liquid preparation is supplied over the entire length of the liquid preparation supply area 11c of the drive roll 11 and slippage easily occurs between the liquid preparation supply area 15c of the film thickness control roll 15, A frictional force can be secured between the driving force transmission region 11d of the driving roll 11 and the driving force transmission region 15d of the film thickness control roll 15, and the rotational driving force can be continuously transmitted from the driving roll 11 to the film thickness control roll 15. It becomes possible to do so.

  Furthermore, it is possible to add a vibration operation to the film thickness control roll 15 within the width of the groove. In this case, the liquid formulation supply region 15 c of the film thickness control roll 15 is preferably elongated in the axial direction by the vibration width of the film thickness control roll 15.

  In the present embodiment, various known speed sensors 13 can be used as the speed sensor 13 that detects the rotational speed of the free rotating roll 12. The speed sensor 13 is preferably a sensor that can measure the rotational speed of the free rotating roll 12 without contact. As such a speed sensor 13, for example, a laser Doppler surface speed meter, a laser speckle surface speed meter, or the like is preferably used in a non-contact manner spaced apart from the surface of the free rotating roll 12. Since the rotation speed of the free rotating roll 12 reaches a zero rotation state (stationary state) depending on the type of liquid preparation that is an object to be evaluated, the speed sensor 13 should be capable of measuring an extremely low rotation speed. Is preferred. In FIGS. 1A and 1B, the speed sensor 13 is provided outside the liquid preparation supply region 12c of the free rotating roll 12 so as to obtain a more accurate rotational speed measurement result. The surface speed of the reduced diameter step portion 12b is measured by being arranged above the reduced diameter step portion 12b at the end of the free rotating roll 12 so as to be spaced apart from the reduced diameter step portion 12b. When a surface speed meter is used, the surface speed of the liquid preparation supply region 12c can be measured by disposing the free rotation roll 12 away from the liquid preparation supply region 12c.

  In the present embodiment, examples of the predetermined types of liquid preparations to be evaluated for the evaluation of sliminess include various liquid preparations such as daily necessities, cosmetics, etc., for which the feeling of use becomes a problem in use. Specifically, as a predetermined type of liquid preparation to be evaluated, lotion, milky lotion, cream, liquid foundation, UV care agent, antiperspirant application liquid, body lotion, makeup remover, body wash, hair styling Tableware cleaning fee, residential cleaning fee, clothing cleaning fee, and the like.

  In the evaluation method for sliminess of the present embodiment, the entire nip portion 14 between the drive roll 11 and the free rotation roll 12, in other words, while rotating the drive roll 11 using the evaluation apparatus 10 having the above-described configuration, in other words. From the change in the rotational speed of the free rotating roll 12 when the liquid preparation is supplied over the entire length of the nip portion 14 in the width direction, for example, the strength of the luster of the skin lotion is evaluated as the liquid preparation.

  In the evaluation method of this embodiment, in the state before supplying the liquid preparation which is an evaluation object and measuring the change in the rotational speed of the free rotating roll 12, the free rotating roll 12 (and the film thickness control roll 15). Is rotating at a predetermined initial rotational speed as the drive roll 11 is driven to rotate. That is, when the drive roll 11 is rotated by, for example, a motor (drive device) attached to the shaft portion 11 a of the drive roll 11, the free rotation roll 12 (and the film thickness control roll 15) in contact with the drive roll 11. Is rotated with the rotation of the drive roll 11 by the action of the frictional force with the drive roll 11.

  Thereafter, when using, for example, a drive roll 11 in the vicinity of the nip portion 14 or a film thickness control roll 15 using a pipette (not shown) or the like, the drive roll 11 and the film thickness control roll 15 A predetermined amount of a liquid preparation which is an object to be evaluated is supplied to a portion between the two. The supplied liquid preparation is produced by the rotation of the drive roll 11, the free rotation roll 12, and the film thickness control roll 15, and the nip portion 14 between the drive roll 11 and the free rotation roll 12, or the drive roll 11 and the film. By passing through the portion between the thickness control roll 15, it spreads evenly and thinly on the peripheral surface of the drive roll 11, and is supplied so as to cover a region corresponding to the entire length in the width direction of the peripheral surface of the free rotating roll 12. Applied.

  As a result, the liquid formulation (skin lotion) that is an object to be evaluated is supplied to the nip portion 14 between the drive roll 11 and the free rotating roll 12 over the entire length (over the entire length in the width direction). Therefore, the friction force between the drive roll 11 and the free rotating roll 12 is reduced by the intervention of the liquid preparation. This makes them both slippery.

  By the way, at this time, on the exit side in the rotation direction of the nip portion 14 where the driving roll 11 and the free rotating roll 12 are in contact with each other, the liquid preparation which is an object to be evaluated on these roll surfaces is between the two roll surfaces. A force in the direction of separation is applied. Here, when the liquid property of the liquid preparation which is an object to be evaluated is sticky, the liquid preparation expresses resistance to the force separating between the roll surfaces. Since this resistance force acts in a direction that suppresses the rotation of the free rotating roll 12, the rotational speed of the free rotating roll 12 decreases. In other words, the decrease in the rotational speed strongly reflects the adhesive strength of the liquid preparation that is the evaluation object.

  That is, the liquid preparation that is an object to be evaluated reduces the frictional force between the roll surfaces in the nip portion 14 between the drive roll 11 and the free rotating roll 12, and inhibits the coupling between these roll surfaces, and In this case, when the liquid property is sticky and inhibits the rotation accompanying the rotation of the drive roll 11 of the free rotating roll 12, the free rotation can be quickly performed immediately after the roll surface is covered with the object to be evaluated. The roll 12 will begin to reduce its rotational speed. In other words, if the free rotating roll 12 starts to rapidly reduce the rotation speed from the time when the roll surface is covered with the liquid preparation that is the object to be evaluated, the object to be evaluated covering the roll surface is a clue to contact. The first requirement for a slimy to slip with a sensation that prevents direct contact with the contacted object, such as loss of contact 2 with the second requirement of sliminess that a sense of clinging to a hand or finger trying to contact a contact object (or a sense of sticky things such as mucus intervening on the surface) is involved. It is considered to be a slimy liquid formulation that meets one requirement.

  FIG. 2 shows a lotion that is a liquid formulation having a relatively strong liquidity as an object to be evaluated, using the above-described measuring apparatus 10 shown in FIG. When the predetermined amount is supplied to the portion between the drive roll 11 and the film thickness control roll 15, the free rotation roll 12 is covered with the object to be evaluated over the entire length, and the entire nip portion 14 is The situation in which the rotational speed of the free rotating roll 12 changes and decreases immediately after the liquid formulation is supplied to the camera is measured by the speed sensor 13, and the time (seconds) is displayed on the horizontal axis. In FIG. 2, the measured value of the surface speed by the speed sensor 13 in the liquid preparation supply region 12c of the free rotating roll 12 is used in place of the rotating speed of the free rotating roll 12 (the rotating speed of the free rotating roll 12 is this surface). Proportional to speed). While the surface speed of the free rotating roll 12 is being measured, the drive roll 11 is driven at a constant surface speed of 400 mm / s.

  According to the change in the rotational speed of the free rotating roll 12 shown in FIG. 2, the free rotating roll 12 rotates at the same surface speed as the drive roll 12 until the lotion that is the object to be evaluated is supplied. By supplying a lotion that is an object to be evaluated, slip occurs between the two rolls 11 and 12, and further, on the exit side of the nip portion 14, an adhesive force is generated so as to prevent the rotation of the free rotating roll 12, The rotational speed is quickly reduced, and in some cases, it becomes almost stationary as in this example. In this embodiment, the attenuation gradient (dV / dt) when the rotational speed of the free rotating roll 12 changes while decreasing is used as a preferable physical property value for evaluating the sliminess of the liquid preparation. Thus, for example, the strength of the skin lotion that is a liquid preparation is evaluated by the method described below. More specifically, the greater the value of the attenuation gradient (dV / dt), the greater the sliminess, and the smaller the value, the less the sliminess. Therefore, depending on the value of the attenuation gradient (dV / dt), It will be possible to evaluate the size of the slimy.

  Here, as the rotational speed of the driving roll 11 rotated when measuring the surface speed of the free rotating roll 12 is increased, the contact time between the free rotating roll 12 and the driving roll 11 at the nip portion 14 is shortened. Therefore, it is disadvantageous for the binding between the rolls 11 and 12 (that is, slippery). In addition, the higher the pressing pressure due to the weight of the free rotating roll 12 and the load applied to the shaft portion 12a at the nip portion 14, the more advantageous is the binding between the rolls 11 and 12 (that is, the less slipping). Such an action due to the pressing pressure becomes remarkable particularly when the supplied liquid preparation suspends fine particles. Further, the higher the surface roughness of the peripheral surfaces of the free rotating roll 12 and the drive roll 11 (the lower the smoothness), the easier it is to form a strong binding point, which is advantageous for binding between the rolls 11 and 12. Become. The above conditions reduce the sensitivity to the above-mentioned first requirement for sliminess.

  On the other hand, when measuring the surface speed of the free rotating roll 12, the faster the rotating speed of the driving roll 11 to be rotated, the stronger the adhesive property of the liquid preparation on the outlet side of the nip portion 14, Contrary to the above, the sensitivity is increased with respect to the second requirement for the above-mentioned sliminess.

  Therefore, in order to adjust the sensitivity to the above two requirements and properly evaluate the slimness, it is necessary to consider various conditions. The material of the free rotating roll 12 and the driving roll 11, the surface state, the free rotating roll As for the pressing pressure at the nip portion 14 by 12 and the like, it is necessary to design these conditions in an appropriate range, for example, by collating with the result of sensory evaluation of luster.

  And according to the method for evaluating the sliminess of the liquid preparation of the present embodiment, preferably, as the physical property value for evaluating the sliminess, the rotational speed of the above-mentioned free rotating roll 12 changes while decreasing. The dampening gradient (dV / dt) of can be used to evaluate the strength of the liquid formulation in the following manner, for example.

  That is, for a predetermined type of liquid formulation, the predetermined type of liquid formulation was supplied to the entire nip portion 14 (full length in the width direction) between the drive roll 11 and the free rotation roll 12 while rotating the drive roll 11. At this time, the correlation between the damping gradient (dV / dt), which is a change in the rotational speed of the free rotating roll 12, and the sensory evaluation of the wetness of a predetermined type of liquid preparation is obtained in advance. For example, in evaluating the strength of the wetness of one product of the predetermined type of liquid preparation, the liquid preparation of this one product is used as an evaluation object, and the nip portion 14 between the drive roll 11 and the free rotating roll 12 is evaluated. A damping gradient (dV / dt), which is a change in the rotational speed of the free rotating roll 12 at that time, is obtained. Based on the correlation between the calculated attenuation gradient (dV / dt) and the sensory evaluation that has been determined in advance, it is possible to objectively determine the strength of the wetness of one product of a predetermined type of liquid preparation that is the evaluation target. It becomes possible to evaluate to.

  Therefore, according to the method for evaluating the sliminess of the liquid preparation of the present embodiment or the evaluation device 10 for the sliminess, an index that can be objectively measured, that is, an attenuation gradient, and that is easy to compare in magnitude is used. Compared with the conventional method for evaluating sliminess, the strength and weakness of one product of a liquid formulation can be comprehensively and objectively evaluated more appropriately.

  The present invention is not limited to the above-described embodiment, and various modifications can be made. For example, the change in the rotational speed of the free rotating roll when the liquid preparation is supplied to the entire nip for evaluating the wetness of the liquid preparation need not necessarily be a damping gradient of the rotating speed of the free rotating roll. Further, it may be obtained from other measured values reflecting changes in the rotational speed, such as the time required to reach the steady speed after the speed reduction of the free rotating roll. The damping gradient (dV / dt), which is a physical property value for evaluating the strength of the liquid formulation, does not decrease along a linear gradient with a constant rotation speed, for example, decreases along a curved gradient. In this case, the attenuation gradient (dV / dt) may be the gradient of the steepest portion of the curve.

  Hereinafter, the method for evaluating the sliminess of the liquid preparation of the present invention will be described in more detail with reference to Examples, but the present invention is not limited thereto.

  Using an apparatus similar to the evaluation apparatus 10 of the above embodiment, the nip portion between the drive roll and the free rotation roll for 10 points of commercially available lotion by the same luster evaluation method as the evaluation method of the above embodiment The damping gradient (dV / dt) of the rotational speed of the free rotating roll when the liquid preparation was supplied to the whole was measured. More specifically, the measurement was performed using an apparatus in which a commercially available laser Doppler velocimeter was placed on the top roll of a commercially available incometer (digital incometer D type, manufactured by Toyo Seiki Seisakusho Co., Ltd.). Moreover, sensory evaluation regarding "no sliminess" by 11 panelists was performed on 10 similar lotions. The relationship between the measured attenuation gradient (dV / dt) obtained and the value of sensory evaluation regarding “non-stickiness” (the higher the value, the less sticky) is plotted in FIG. Note that. The surface speed of the drive roll was 400 mm / s. The material of the drive roll was brass, and the material of the free rotating roll was NBR. The pressing pressure of the free rotating roll was about 20 gf / mm. The surface speed of the free rotating roll depended on the measurement of the surface speed in the liquid preparation supply region. In this measurement, the film thickness control roll is not used.

  From the evaluation results shown in FIG. 3, a high correlation is recognized between the measured value of the attenuation gradient (dV / dt) and the sensory evaluation value regarding “non-stickiness”, so that the liquid preparation of the present invention It becomes clear that the method for evaluating the sliminess of the liquid is effective as a method for more appropriately and comprehensively evaluating the strength of the liquid formulation.

DESCRIPTION OF SYMBOLS 10 Slack evaluation apparatus 11 Driving roll 11a Rotating shaft 11b Groove 11c Liquid preparation supply area 11d Driving force transmission area 12 Free rotating roll 12a Rotating shaft 12b Reduced diameter step part 12c Liquid preparation supply area 13 Speed sensor 14 Nip part 15 Film thickness Control roll 15a Rotating shaft 15b Concave groove 15c Liquid preparation supply area 15d Driving force transmission area

Claims (6)

Evaluation of the wetness of a liquid preparation using an evaluation device including a drive roll that is rotated by a drive device and a free-rotation roll that rotates in contact with the drive roll, provided with rotation axes arranged in parallel. An evaluation method for
When the liquid formulation is supplied to the entire nip portion between the drive roll and the free rotating roll while rotating the driving roll, the strength of the liquid formulation is increased or decreased from the change in the rotational speed of the free rotating roll. Method for evaluating the sliminess of a liquid preparation for evaluating   Rotation of the free rotating roll when the predetermined type of liquid preparation is supplied to the entire nip portion between the driving roll and the free rotating roll while rotating the driving roll for the predetermined type of liquid preparation Correlation between the change in speed and the sensory evaluation of the predetermined type of liquid preparation is determined in advance, and the predetermined roll of liquid preparation is used as an object to be evaluated between the drive roll and the free rotating roll. The liquid preparation according to claim 1, wherein the liquid formulation is supplied to the entire nip portion, and the strength of the object to be evaluated is evaluated based on the correlation from the change in the rotational speed of the free rotating roll at that time. Evaluation method for the sliminess.   3. The method for evaluating the sliminess of a liquid preparation according to claim 1 or 2, wherein the strength of the liquid preparation is evaluated from the attenuation gradient of the rotation speed of the free rotation roll when the rotation speed of the free rotation roll changes.   The predetermined type of liquid preparations are lotion, milky lotion, cream, liquid foundation, UV care agent, antiperspirant application liquid, body lotion, makeup remover, body wash, hair styling, dishwashing, household washing. The method for evaluating the sliminess of a liquid preparation according to claim 2 or 3, wherein the method is a garment or a washing agent for clothing. It includes a drive roll that is rotated by a drive device, and a free rotary roll that rotates in contact with the drive roll, and the surface speed of the surface of the free rotary roll is non-contact. in an evaluation device of slimy feel with a speed sensor for detecting,
It has a film thickness control roll for spreading the liquid formulation supplied to the surface of the drive roll evenly and thinly, on both ends of the drive roll and the film thickness control roll, over the entire circumference in the circumferential direction. Each continuous groove is formed, and the region between these sandwiched between the pair of grooves on both sides is a liquid preparation supply region, and the portion outside the pair of grooves on both ends The evaluation apparatus of the sliminess in which each area is a driving force transmission area . The speed sensor is disposed on the outer side of the liquid preparation supply region of the free rotating roll, and is disposed apart from the reduced diameter step at the end of the free rotating roll, and the surface of the reduced diameter step 6. The slimy evaluation apparatus according to claim 5, which measures a speed .

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