JPH01165699A - Production of solid soap - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for producing bar soap, and particularly to a method for producing bar soap that provides a smooth feel without roughness during use.

[Conventional technology]

Traditionally, the manufacturing method for bar soap is to dry neat soap by band drying or vacuum flash drying, extrude it into pellets using a Pro Ladder, mix dyes, fragrances, etc. to this dried dough, and then press it into three rolls or a Pro Ladder ( A method is known in which the mixture is kneaded using a screw (screw) and then extruded.

[Problem that the invention seeks to solve]

However, the bar soap produced by the above-mentioned conventional method has a problem in that hard, small particles appear on the surface of the soap during use, giving it a very rough texture when rubbed by hand.

As a way to solve this problem, for example,
-3 Immediately after drying the neat soap in Publication No. 21500
A method of kneading with a kneading device having more than one roll is described, but although this method shows some improvement, it does not reach the level where the roughness is completely eliminated.

Therefore, an object of the present invention is to provide a method for producing a bar soap that eliminates the above-mentioned conventional problems and gives a very smooth feel without any roughness during use.

[Means for solving problems]

As a result of intensive studies to achieve the above object, the inventors dried neat soap, and after drying, extruded the soap composition into pellets. We learned that when kneading is carried out using a twin-screw kneading extruder having kneading zones arranged in a configuration, it is possible to obtain a bar of soap that has a very smooth feel with no roughness when used. He came up with an invention.

That is, in the present invention, a soap composition is kneaded using a twin-screw kneading extruder in which a large number of paddles each having a convex lens-shaped shaft cross section are fixedly attached to each shaft, forming a pair with a phase difference of 90 degrees between the two shafts. The present invention relates to a method for producing bar soap, which is characterized in that the extruded mixture is then molded into a desired shape.

[Structure and operation of the invention]

As mentioned above, the twin-screw kneading extruder used in this invention has a large number of paddles fixed to each shaft, each having a convex lens cross-section and forming a pair with a phase difference of 90 degrees between the two shafts. be. Figures 1 to 3 show an example A of such a twin-screw kneading extruder.

In the figure, a horizontally long cylindrical trough l has an extrusion port 1a at one end and a hopper 1b at the top of the other end.
Inside, two rotating shafts 3a and 3b, which are synchronously rotated in the same direction by the drive device 2, are arranged in parallel along the horizontal direction, and each of the rotating shafts 3a and 3b has a large number of paddles 4.4 each having a convex lens cross section. ... and a screw 5 located on the hopper 1b side, that is, on the proximal end side, are fixedly installed.

The paddles 4 of one rotating shaft 3a are arranged in order from the tip side with the arrangement angle of the one located at the tip end of the shaft as a reference (0 degree).
2 degrees, 3 45 degrees, 4 90 degrees, 3 180 degrees (0 degrees)
A plurality of sheets are densely arranged so that each sheet has a different phase, such as four sheets at 135 degrees. Further, the paddles 4 of the other rotating shaft 3b are arranged in order from the distal end side, with the arrangement angle of the one located at the most distal end of the rotating shaft 3a as a reference (0 degrees): two 90 degree paddles, three 135 degree paddles, four 0 degree paddles. 3 pieces at 90 degrees,
Adjacent paddles 4.4 are closely arranged in pairs with a phase difference of 90 degrees between the rotating shaft 3a, such as four 45 degree paddles. In addition, the inner wall of the trough 1 and each paddle 4
Between the two rotating shafts 3a, 3 and between the multiple pairs of paddles 4.4.
It is set so that a slight clearance is maintained in the synchronous rotation operation of b.

In the twin-screw kneading extruder with the above configuration, both rotating shafts 3a and 3b are synchronously rotated in the same direction via a motor built in the drive device 2 or a belt or chain with the motor, and the soap is poured into the trough l from the hopper 1b. By continuously charging the composition, this charged composition is transferred to the screw 5.
5 is sequentially sent to the kneading zone 2 where paddles 4.4... are arranged, and in the process of moving while being kneaded in this kneading zone Z, it is uniformly mixed by receiving mechanical shearing force, Finally, it is extruded from the extrusion port 1a in the form of a rod. Then, this extruded soap composition is molded by stamping or the like to obtain a bar soap product of a desired shape. In addition,
The extrusion port 1a is removable.

Here, the cross section of the kneading zone Z includes both rotating shafts 3a.

The paddles 4.4 that form a pair between the paddles 3b rotate synchronously while maintaining a 90 degree phase difference, so that the paddles 4.4 in FIG.
There are always three zones Z+ and Zz as shown by dl.

It is divided into Z. The cross-sectional area of each zone z1 to Z3 is
Taking the hatched zone Z1 as an example, as the paddles 4, 4 rotate, it expands in the process from FIG. 4 (al) to FIG. Figure 4 (
It is reduced in the process of reaching dl, and then again the 4th figure fal and the 4th
The soap composition that moves through the kneading zone Z is forced to repeatedly undergo volume changes of compression and stretching during this movement process. As a result, the soap composition is mixed extremely uniformly, and the bar soap obtained by molding the soap composition is extremely smooth without any roughness.

Note that the number of paddles installed on each of the rotating shafts 3a and 3b, the phase difference between the paddles 40 adjacent to each other in the axial direction, the number of paddles superimposed in each phase group, etc. can be set in various ways, and the kneading effect can be improved by devising a combination of these. can be adjusted.

In addition, as the paddle 4, in addition to a normal flat paddle 4a with both sides in the same phase as shown in FIG.
Helical paddle 4b with both sides out of phase as shown in figure (b)
can be used. That is, helical paddle 4
b exerts a kneading action as well as a feeding action or a returning action depending on its direction, so by arranging it in combination with the flat paddle 4a at key points in the kneading zone Z, the soap composition can be locally and progressively fed within the kneading zone Z. Alternatively, the kneading effect can be further improved by feeding the mixture backwards.

In addition, the number of arranged helical paddles 4b, the number of flat paddles 4
The installation ratio with a can be set in various ways.

In addition, various combinations of paddle pairs between the two rotating shafts 3a, 3b are possible, such as helical paddles 4b, 4b facing the same direction, helical paddles 4b, 4b facing opposite directions, flat paddles 4a, 4a pairing each other.

The soap compositions used in this invention include the same compositions as those used in ordinary cosmetic soaps, such as beef tallow fatty acid sodium soap, coconut oil fatty acid sodium soap, and various animal bases conventionally known as soap bases. Sodium soaps of natural and vegetable fatty acids can be used alone or in combination of two or more, and a small amount of a denaturing agent may be added to them. In addition, various additives such as chelating agents, humectants, dyes, and perfumes may be appropriately blended into this soap composition as required.

When feeding such a soap composition into a twin-screw kneading extruder, it may be possible to dry the neat soap by band drying or vacuum flash drying according to a normal soap manufacturing method, and then feed it directly. Alternatively, the pellets may be extruded into pellets using a brodder, which is a conventional toilet soap manufacturing device, and then fed.

In addition, in order to make the soap composition kneaded by the twin-screw kneading extruder into an extrudate suitable for molding, the twin-screw kneading extruder illustrated in FIGS. 1 to 3 utilizes the extrusion port 1a, The extrusion temperature is usually set to be in the range of 40 to 60°C, and extrusion is carried out into a rod shape or the like.

In addition, a kneaded material such as a chip-like material kneaded and extruded using a twin-screw kneading extruder having the extrusion port 1a and having the same configuration as above is further equipped with another brooder (cone part). Alternatively, the mixture may be put into an extruder and extruded into a rod shape at the same temperature as above. The composition thus extruded is finally molded into a desired shape by stamping or the like.

〔Effect of the invention〕

As described above, in the method of the present invention, a soap composition is kneaded using a twin-screw kneading extruder having a kneading zone in which a number of paddles of a specific shape form a specific arrangement. It is now possible to produce a bar of soap that has no roughness and has a very smooth feel when used, which was difficult to do with other methods.

〔Example〕

EXAMPLES Below, examples of the present invention will be described in more detail. In the following, parts mean parts by weight. In the examples, a continuous kneader manufactured by Kurimoto Iron Works (■) was used as a twin-screw kneading extruder.

Example 1 In the twin-screw kneading extruder shown in Figs. 1 to 3, the trough length is 440 fl, and the paddle 4 having a convex lens cross section with a paddle diameter of 50 mm is attached to one rotating shaft 3a, and a helical paddle 4b1.
24 pieces in total with a combination of 2 pieces and 12 pieces of flat paddle 4a
The paddles 4 of the same diameter and the same number are fixed to the other rotating shaft 3b with a phase difference of 90 degrees to each paddle 4 of the rotating shaft 3a. Axis 3
a.

3b in the same direction at a rotation speed of 9 Orpm, the following soap composition; fragrance is added from the hopper 1b
1 part titanium dioxide
0.2 parts water
Total remaining 100
1.500g of the liquid was put in, the outlet temperature was set to 50℃, and the product was extruded into a rod shape with a diameter of 30cm.
+ m, width 4 Q mm, thickness 2 (1 wn) bar soap was stamped and molded. The residence time of the soap composition in the twin-screw kneading extruder was about 15 minutes.

Example 2 In the twin-screw kneading extruder shown in FIGS. 1 to 3, the trough length is 800 m, and the paddle 4 having a convex lens-shaped axial cross section with a paddle diameter of 1001 m is mounted on one rotating shaft 3a, and a helical paddle 4b1.
A total of 28 in combination with 6 paddles and 12 flat paddles 4a.
A pair of paddles 4 of the same diameter and the same number are fixed to the other rotating shaft 3b with a phase difference of 90 degrees to each paddle 4 of the rotating shaft 3a. Axis 3
While a+3b is synchronously rotated in the same direction at a rotation speed of 18 Orpm, the following soap composition; fragrance is added from hopper 1b.
1 part titanium dioxide
0.2 parts water
Total remaining
5.000 g of 100 parts was put in, and the extrusion port 1a was removed and discharged to obtain chips. The residence time of the soap composition in the twin-screw kneading extruder was about 20 minutes.

Next, this chip-shaped kneaded material is extruded using an extrusion a (screw: diameter 80 mm, length 4
001m, cone: exit diameter 20mm, length 150+
+n) and extruded with the outlet temperature set at 48°C, and as in Example 1, it was extruded using
It was molded into a solid dragon soap.

Comparative Example Using the same soap composition as that used in Example 1, this 2
．． 000 g was kneaded for about 15 minutes using three rolls with roll rotation speeds of 2 Orpm, 48 rpm, and 1107 rpm. Next, this soap composition was extruded using the same extruder used in Example 2, which is used in the production of ordinary toilet soap, and then molded into bar soaps of the same size as in Example 1. It was molded.

The bar soaps obtained in the above Examples and Comparative Examples were subjected to the following roughness test to examine the degree of roughness on the soap surface.

Roughness Test> Each bar of soap was fixed in a plastic case, and the surface was gently rubbed with a finger while running tap water at 20°C for 5 minutes to determine whether the roughness bothered the fingers.

As a result of this roughness test, the bar soaps obtained in Examples 1 and 2 had a very smooth feel with no roughness, but the bar soaps obtained in Comparative Examples had a considerable amount of roughness. This test also shows that by kneading the soap composition using the twin-screw kneading extruder having a kneading zone in which a number of paddles of a specific shape according to the present invention form a specific arrangement, a very smooth soap composition with no roughness can be obtained. However, it is clear that the problem of roughness cannot be completely solved using a conventional three-roll kneader.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional side view showing an example of a twin-screw kneading extruder used in the present invention, FIG. 2 is a cross-sectional plan view of the same, and FIG. FIGS. 4(a) to (d+) are schematic cross-sectional views sequentially showing the kneading operation of the same extruder, and FIGS. 5(a) and (b) are perspective views of a paddle used in the same extruder. A... Twin-screw kneading extruder, 3a, 3b... Rotating shaft, 4
(4a, 4b)...Convex lens-shaped paddle in axial cross section Patent applicant: Nippon Oil & Fats Co., Ltd. Figure 1 Figure 2 Figure 44 (a) (b)

Claims (1)

[Claims] (1) A soap composition is kneaded using a twin-screw kneading extruder in which a large number of paddles with a convex lens cross section are fixedly attached to each shaft, forming a pair with a phase difference of 90 degrees between the two shafts, and then extruded. A method for producing bar soap, which comprises molding the kneaded product into a desired shape.