JPH09201252A - Casting device for compounded latex raw material and its casting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the yield of puff for cosmetics and to improve the productivity thereof by eliminating the void defects and unequal foaming defects of columnar foam rubber base materials. SOLUTION: This casting device injects compounded latex raw materials 1 in which fine air bubbles are included into metal molds by a foaming machine K. The device includes the blind cylindrical metal molds 2 which are disposed in an upright state, a piping 4 which connects the discharge side of this foaming machine K to the bottoms 2a of the metal molds so as to allow the injection of the compounded latex raw materials 1 to the bottoms 2a of the metal molds 2, connection joints 5 which are disposed at the front ends of the pipings and constituted to freely attachably and detachably connect the piping 4 and the bottoms 2a of the metal molds and a selector valve 6 disposed in the piping route.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compounded latex for injecting a compounded latex raw material into a mold so as to prevent entrapment of air and unevenness of foaming when a columnar foam rubber substrate for a cosmetic puff is produced. The present invention relates to a raw material casting apparatus and a casting method thereof.

[0002]

2. Description of the Related Art One of the methods for producing a cosmetic puff such as a powder foundation is to form a columnar foam rubber base material whose cross section is approximately equal to the size of the cosmetic puff surface and then slice the foam rubber base material. By cutting,
There is a manufacturing method that makes several cosmetic puffs from one foam rubber base material. The manufacturing method of such a cosmetic puff is
The outline is as follows. First, a raw material latex made of acrylonitrile-butadiene rubber (NBR), natural rubber (NR) or the like is blended with a metered compound such as a vulcanizing agent, an antioxidant and a dispersant. And, bubble stabilizer, pigment,
A gelling agent or the like is added, air for air is further mixed in, and mechanical agitation operation is performed to promote formation of fine bubbles. Next, the compounded latex raw material containing the fine bubbles is poured into a cylindrical mold to complete gelation at a predetermined temperature. Then, heat vulcanization is performed, and after washing, dehydration and drying, a columnar foam rubber substrate is produced. After that, the columnar foam rubber substrate is slice-cut (cut) into a predetermined thickness corresponding to a cosmetic puff, and after the final stage of polishing, powder removal, and inspection,
By packaging each one, a cosmetic puff product is completed.

Here, in the production of the cosmetic puff,
The method of injecting the compounded latex raw material into the cylindrical mold is conventionally
A method of casting the compounded latex raw material 1 from directly above the mold 2 (FIG. 3 (A)), a method of placing the mold 2 vertically and pouring the compounded latex raw material 1 by tying the inner surface of the mold ( 3 (b)), the method of casting the compounded latex raw material 1 by inclining the mold 2 obliquely to tie the inner surface of the mold 2 (FIG. 3 (c)) and the like have been adopted.

[0004]

However, the method of injecting the compounded latex raw material 1 into the cylindrical mold was unexpectedly difficult. If the injection method is poor, voids (cavities) are generated in the molded portion corresponding to the bottom portion 23 and the side surface 24 of the mold 2, which is a cause of defects. In the above-mentioned method, the air in the mold is hard to escape, and according to the method of ,, when the viscosity of the compounded latex raw material 1 is low, the generation of voids is relatively smaller than that of the method, but the raw material viscosity is If it is high, it will fall while entraining air, so it was easy to create voids. Further, when the method of and is adopted, the foaming unevenness is likely to occur in the product. When making a cosmetic puff with fine cells, it is necessary to increase the gelation speed of the compounded latex material 1,
In such a case, the portion at the beginning of pouring gels before the end of casting, and in many cases the product becomes defective due to layered unevenness.

The present invention solves the above-mentioned problems by casting a compounded latex raw material aiming at improving the yield of cosmetic puffs and improving the productivity by eliminating void defects and defective foaming defects of the columnar foam rubber substrate. An object is to provide a device and a casting method thereof.

[0006]

In order to achieve the above object,
The gist of the present invention as set forth in claim 1 is a casting device for injecting a compounded latex raw material containing fine bubbles into a mold by a foaming machine, and having a bottomed cylindrical shape arranged in an upright state. A mold, a pipe connecting the bubbler discharge side to the bottom of the mold so that the compounded latex raw material can be injected into the bottom of the mold, and the pipe is provided at the tip of the pipe and the pipe and the bottom of the mold are detachably connected. A casting apparatus for blended latex raw material, comprising: a connection joint configured as described above; and a switching valve provided in the pipe path. The compounded latex raw material casting apparatus of the present invention according to claim 2 comprises the plurality of molds according to claim 1, each mold bottom portion is connected to a pipe through a connection joint, and further, a connection joint. A common header for distributing and injecting the compounded latex raw material into each mold is attached to the upstream side pipe. The casting method of the compounded latex raw material according to claim 3 is a method of casting the compounded latex raw material in which a compounded latex raw material containing fine bubbles is injected into a bottomed cylindrical mold by a foaming machine. In this case, the metal mold is made to stand upright, and the compounded latex raw material is injected through an opening provided at the bottom of the metal mold.

According to the first aspect of the present invention, when the bottomed cylindrical mold is raised, the bottom of the mold is connected to the pipe from the discharge side of the bubbler, and the compounded latex raw material is injected into the mold, Since the compounded latex raw material is filled so that the air in the mold is pushed out so that the liquid surface gradually rises from the bottom of the mold, no air is entrained. Further, since the injection rate of the compounded latex raw material is not so limited, it is possible to sufficiently cope with the case of making a cosmetic puff of a fine cell for which the gelation speed must be increased. Furthermore, since a connection joint for detachably connecting the pipe and the bottom of the mold and a switching valve provided in the pipe path are provided, it is easy to disconnect the mixed latex raw material from the pipe of the mold. Become.

When a common header is provided for a plurality of molds as in the second aspect of the present invention, the compounded latex raw material can be simultaneously injected into each mold, which contributes to improvement in productivity. When the compounded latex raw material is injected from the opening provided at the bottom of the mold as in the invention of claim 3, the air in the mold is smoothly extruded due to the rise of the liquid level accompanying the injection of the compounded latex material. Therefore, air will not be entrapped inside the compounded latex raw material.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a compounding latex material casting apparatus and a casting method therefor according to the present invention will be described in detail below. (1) Embodiment 1 Casting Device for Compounded Latex Raw Material FIG. 1 is a step of molding a columnar foam rubber substrate for a cosmetic puff, and shows one form of a casting device for compounded latex raw material according to the present invention. The figure is a schematic explanatory view showing the positional relationship between the mold, the piping connecting the foamer discharge side to the bottom of the mold, the connection joint, and the bubbler. The same reference numerals as those in FIG. 3 described above indicate the same or corresponding portions.

In the present invention, the compounded latex raw material 1 is injected into the mold 2 to form a columnar fine mesh puff base material (which becomes the foam rubber base material R after vulcanization). NBR
The compounded latex raw material 1 in which the vulcanizing agent and the gelling agent are added to the latex as the main raw material is passed through the pipe P to form the foaming machine K.
The mixture is fed to an (Oaks mixer), where the compounding latex raw material 1 contains fine bubbles by the stirring operation of the foaming machine K. Reference numeral 8 is a bubble air conduit.

The mold 2 has a vertically elongated cylindrical shape with a bottom and is arranged in an upright state. The cross section of the mold 2 has a shape similar to a cosmetic puff as a final product. This is because the polishing time in the polishing operation in the subsequent step is shortened and the shape of the final product can be accurately produced. A nozzle 21 having a diameter substantially the same as that of a pipe 4 described later is erected and fixed on the bottom 2a of the mold. Here, the nozzle 21 is fixed to the bottom surface 22 of the mold. The nozzle position may be on the cylindrical side surface 23 near the bottom surface 22 of the mold, but it is more sure to provide the nozzle on the bottom surface 22 of the mold to prevent the inclusion of air in the mold when injecting the compounded latex raw material 1 into the mold 2. it can.

Reference numeral 4 indicates a pipe connected to the nozzle 21 from the discharge side of the foaming machine K. The pipe 4 makes it possible to send the compounded latex raw material 1 containing fine bubbles from the foaming machine K into the mold 2. The pipe 4 may be a metal pipe, but it is more preferable in terms of workability and workability if the pipe 4 is composed of a pressure-resistant hose or the like having a freedom of movement. The connection between the pipe 4 and the nozzle 21 is connected by a detachable connection joint 5. As the connection joint 5, for example, a coupler joint method, a union method, a flange method or the like can be adopted. Reference numeral 6 indicates a switching valve provided in the pipe path. The switching valve 6 may be a two-way switching valve, but here, a three-way cock is used and the short pipe 9 extends from one side of the switching valve 6.

Casting Method of Blended Latex Raw Material Next, a casting method of the blended latex raw material according to the present invention will be described using the above casting apparatus. First, the compounded latex raw material 1 obtained by adding a vulcanizing agent, a gelling agent, etc. to a latex such as NBR as a main raw material is introduced into the foaming machine K through the pipe P,
Further, the air for bubbles is guided to the foaming machine K from the conduit 8. Then, the foaming machine K produces the compounded latex raw material 1 containing fine bubbles. At this point, the switching valve 6 is still closed. Then, the switching valve 6 is opened so that the compounded latex raw material 1 is conducted into the mold 2 through the pipe 4, the switching valve 6 and the nozzle 21. Since the compounded latex raw material 1 is subjected to the back pressure of a pump (not shown), the switching valve 6 is opened to pass from the discharge side of the foaming machine through the pipe 4 and through the opening O formed by the nozzle 21 to the metal. Enter the mold 2. Since the mixed latex raw material 1 is filled into the mold from the mold bottom portion 2a, the air initially in the mold 2 is pushed upward as the liquid level 11 of the mixed latex raw material 1 rises. Since the mold 2 has an open upper surface as shown in the figure, the air inside the mold is smoothly discharged out of the mold as the liquid surface 11 of the compounded latex raw material 1 rises. Therefore, the entrainment of air as described in the prior art does not occur.

The liquid level 11 of the compounded latex raw material 1 rises with the lapse of time to almost completely fill the inside of the mold. When the liquid level 11 of the compounded latex raw material 1 reaches the top of the mold, the switching valve 6 is closed. The blended latex raw material 1 containing fine bubbles injected into the mold usually gels (solidifies) within 1.5 to 2.5 minutes under a predetermined temperature, and the fine bubbles remain as they are. A fine mesh puff base material is formed in a preserved form. Then remove the connection joint 5,
This is connected to the bottom of another mold 2 (not shown), more preferably to a nozzle 21 provided on the bottom. Then, the series of operations described above is repeated. If necessary, a foaming machine K
The switching valve 6 (three-way valve) is operated so that the pipe from the switching valve 6 to the short pipe 9 is electrically connected. This is because the unnecessary compounded latex material 1 remaining in the pipe 4 is released.

Thereafter, the fine mesh puff base material is vulcanized, washed, dehydrated, and dried to become a desired foam rubber base material R, and the foam rubber base material R is further cut into a cosmetic puff thickness, After polishing, dust removal, and inspection, the final product, a cosmetic puff, is completed.

Effect of Embodiment 1 According to the casting apparatus and the casting method for the blended latex raw material 1 configured as described above, the method for casting the blended latex raw material 1 into the mold from above as in the conventional method, Since the mold 2 is set up and the bottom face 22 of the mold is connected to the pipe 4 from the discharge side of the foaming machine, and the compounded latex raw material 1 is filled from the bottom face 22, there is no risk of entraining air. Not only the side and bottom surfaces of the foam rubber substrate R that have been conventionally observed, but also the void defects scattered inside are eliminated. Furthermore,
Even if the injection speed of the compounded latex raw material 1 is increased, the liquid level 11
Since it rises smoothly without waviness, it can be sufficiently applied even for the production of a cosmetic puff with a fine cell having a short gel time. In the past, since the injection rate of the compounded latex raw material 1 could not be increased, there were many cases in which the product was defective due to layered unevenness, but this problem was also solved.
In addition, a foam rubber substrate R is provided between the top and bottom of the mold.
There was a case where the density difference of the product became quite large and the quality of the product became unstable.
I was able to solve it thanks to the quick injection of. Combined with these effects, the number of cosmetic puffs, which is the final product, taken from one foam rubber substrate R is increased, and the yield is improved and the quality is stabilized.

(2) Embodiment 2 Casting Device for Blended Latex Raw Material In this embodiment, as shown in FIG. 2, a plurality of molds 2 are provided (here, three for convenience), and each mold bottom 2a is It is a casting device that is connected to a pipe via the connection joint 5. Each mold 2 is attached to the upstream pipe 4 of the connection joint 5.
A common header 41 into which the compounded latex raw material 1 is distributed and injected is attached. The common header 41 has a multi-branched pipe structure for distributing the compounded latex raw material 1 coming from the foaming machine K through the pipe 4 to each mold 2. The common header 4
It is more preferable to use a header structure in which the compounded latex raw material 1 is filled in the respective molds through 1 at the same ratio.
Here, the common header shape is devised so that the flow rate of the mixed latex raw material 1 passing through each branch pipe 411 is as uniform as possible. Further, if necessary, the branch pipe 411 is provided with a control valve 7 so that the flow rate is uniform. Other configurations are the same as those in the first embodiment.

Casting Method of Compounded Latex Raw Material The casting method of the compounded latex raw material of the present invention will be described using the above casting apparatus. First, the nozzle 21 of each mold 2 and the corresponding branch pipe 411 of the common header are connected to each other by a joint 5
To join. If there are control valves 7, all these control valves 7 are opened. The switching valve 6 is closed. Then, the foaming machine K is operated to generate the compounded latex raw material 1 containing fine bubbles. Then, the switching valve 6 is opened so that the foaming machine K is electrically connected to the inside of the mold 2 through the pipe, the switching valve 6, the common header 41, and the nozzle 21. The compounded latex raw material 1 enters the mold 2 from the discharge side of the foaming machine through the pipe 4 by opening the switching valve 6 and through the opening O formed by the nozzle 21. Since the mixed latex raw material 1 is filled into the mold from the mold bottom portion 2a, the air originally in the mold is smoothly discharged out of the mold as the liquid level 11 of the mixed latex raw material 1 rises. To go. Here, the control valve 7 is adjusted as necessary so that the rising speeds of the liquid level 11 of the compounded latex raw material 1 in the respective molds match.

For all the molds 2, when the liquid level 11 of the compounded latex raw material 1 reaches the top of the mold, the switching valve 6
Close. Then, the compounded latex raw material 1 is gelated at a predetermined temperature to obtain a fine mesh puff base material. After that, remove each connection joint 5, 5, .... The fine mesh puff base material becomes a desired foam rubber base material R after being vulcanized, washed, dehydrated and dried as in the first embodiment. If the foam rubber substrate R is cut into a thickness of a cosmetic puff, and then subjected to polishing, powder removal, and inspection, a final product cosmetic puff is completed.

Effects of the Embodiment According to the present embodiment, in addition to the effects of the first embodiment, it is possible to simultaneously fill the respective molds 2, 2, ... With the compounded latex raw material 1 and perform the subsequent gelation treatment at one time. Therefore, the productivity is greatly increased.

The present invention is not limited to those shown in the above embodiment, but various modifications can be made within the scope of the present invention depending on the purpose and application. The shape, structure, size, number, etc. of the mold 2, the piping 4, the connection joint 5, and the switching valve 6 are appropriately selected according to the application. The control valve 7 may be omitted.

[0022]

As described above, according to the casting apparatus and the casting method for the compounded latex raw material of the present invention, the void defect and the foaming irregularity defect of the columnar foam rubber base material can be eliminated, and further, the upper and bottom parts of the mold can be eliminated. The difference in the density of the foam rubber base material is reduced, which not only contributes to the improvement of the yield and the quality stability of the cosmetic puff, but it also has an excellent effect such that the common header can be incorporated to improve the productivity.

[Brief description of drawings]

FIG. 1 is a schematic explanatory diagram showing a positional relationship among a pipe connecting a mold and a foaming machine discharge side to a bottom of the mold, a connection joint, and a foamer in the first embodiment.

FIG. 2 is a schematic explanatory diagram showing a positional relationship among a plurality of molds, a pipe connecting a plurality of molds, a foaming machine discharge side to a mold bottom, a connection joint, a common header, and a foamer.

FIG. 3 is an explanatory sectional view of a conventional technique.

[Explanation of symbols]

 1 Compounded latex material 2 Mold 2a Bottom 4 Piping 41 Common header 5 Connection joint 6 Switching valve K Foamer O Open hole

Claims (3)

[Claims] 1. A casting device for injecting a compounded latex raw material containing fine bubbles into a mold by a foaming machine, comprising a bottomed cylindrical mold (2) arranged in an upright state, Piping (4) that connects the bubbler discharge side to the bottom of the mold so that the compounded latex raw material can be injected into the bottom of the mold, and the pipe is provided at the tip of the pipe and detachably connects the pipe and the bottom of the mold. A casting apparatus for blended latex raw material, comprising: a connection joint (5) to be obtained; and a switching valve (6) provided in the pipe path. 2. A plurality of said molds are provided, and the bottom of each mold is connected to said pipe through a connection joint, and further,
The casting apparatus for blended latex raw material according to claim 1, wherein a common header for distributing and injecting the blended latex raw material into each mold is attached to an upstream pipe of the connection joint. 3. A method for casting a compounded latex raw material in which a compounded latex raw material containing fine bubbles is injected into a bottomed cylindrical mold by a foaming machine, wherein the mold is raised. A method for casting a compounded latex raw material, which comprises injecting the compounded latex raw material through an opening provided at the bottom of the mold.