Abstract:
The present invention relates to a method for molding a shape of bristles of a mascara brush for eyelashes, a mold in used in the method. Two strands of iron cores are twisted and brush bristles respectively having dorsal portions are radially spread between the twisted iron cores through post-process so as to form a mascara brush, wherein the dorsal portions are formed by the brush bristles of the same length on the basis of the iron cores without difference in the length of the brush bristles, so that a mascara solution contained in the dorsal portion does not run down when being applied to eyelashes, and the mascara provides more volume and a beautiful eyelash make-up when a sufficient amount of the mascara solution is applied.

Description:
CROSS REFERENCE TO RELATED APPLICATIONS AND CLAIM OF PRIORITY 
     This patent application is a National Phase application under 35 U.S.C. §371 of International Application No. PCT/KR2011/004679, filed Jun. 28, 2011, which claims priority to Korean Patent Application No. 10-2010-0129933 filed Dec. 17, 2010, entire contents of which are incorporated herein by reference. 
     BACKGROUND 
     1. Technical Field 
     The present invention relates to a method for molding a shape of bristles of a mascara brush for eyelashes, a mold used in the method, and a mascara brush molded by the method. Two strands of iron cores are twisted and brush bristles respectively having dorsal portions are radially spread between the twisted iron cores through a post-process so as to form a mascara brush, wherein the dorsal portions are formed by the brush bristles of the same length on the basis of the iron cores without difference in the length of the brush bristles, so that a mascara solution contained in the dorsal portion does not run down when being applied to eyelashes, and the mascara provides more volume and a beautiful eyelash make-up by patterning out when a sufficient amount of the mascara solution is applied. 
     2. Description of the Related Art 
     Eyes have a great influence on a person&#39;s appearances and impressions. So, many women make a lot of efforts to make the optimum appearance and impression through eye makeup, and one of such efforts is eyelash makeup. 
     Eyelash makeup out of the eye makeup methods plays an important role to express eyes beautifully, and people use mascara brushes for eyelash makeup. 
     As mascara brushes used for eyelash makeup, there are rubber brushes and brushes having nylon bristles (brushes) spirally twisted between two strands of iron cores several times so as to have a circular section. 
     Because such mascara brushes have their own features and merits, users can select them according to the users&#39; tastes and use purposes, but till now, mascara brushes manufactured using the nylon bristles are popular. 
     As described above, the mascara brush using the nylon bristles is manufactured by the steps of putting nylon bristles (brushes) between two strands of iron cores and spirally twisting them several times, and the manufactured mascara brush has a circular shape in horizontal section. 
     When the user applies eyelash makeup using the mascara brush, the user stains a mascara solution contained in a mascara container on the mascara brush and brushes the eyelashes with the mascara brush so that the mascara solution is applied to the eyelashes and the eyelashes are curled upwardly by the applied mascara. 
     As described above, the conventional mascara brush has several problems in that the mascara solution is not applied to the eyelashes uniformly and generates bubbles or is agglomerated because the mascara brush formed in a circular shape applies the mascara solution to the eyelashes in a state where the mascara solution is not smoothly permeated between the eyelashes. 
     In the case that the mascara solution generates bubbles or is agglomerated, the eyelashes are not curled upwardly and the applied mascara solution makes the eyelashes dirty, and hence, it may cause a feeling of aversion. In the case that the applied mascara solution is agglomerated, mascara applied to the eyelashes may drop from the eyelashes and get in eyes by wind, so that it may obstruct the user&#39;s field of vision or may cause skin troubles by dropping on the skin around the eyes. 
     In order to overcome the problems of the conventional mascara brush, mascara brushes of various shapes have been manufactured in such a way as to correspond with eyelashes. 
     In other words, the manufactured mascara brush has dorsal portions formed on the mascara brush through a post-process in such a manner that the dorsal portions first get in contact with the eyelashes when the user applies eyelash makeup using the mascara brush, and hence, the above-mentioned problem can be solved. 
     The dorsal portions are formed in such a way that the nylon bristle has a triangular shape or a serrated shape in horizontal cross section, and may be formed by various methods. 
     As described above, the mascara brush bristles made of nylon and having a circular shape are cut to have the dorsal portions of the triangular shape or the serrated shape. 
     Korean Utility Model Registration No. 20-0239112 discloses a “Mascara brush for eyelash makeup” in which brush bristles are formed by cutting. 
     In Korean Utility Model Registration No. 20-0239112, the mascara brush can apply a mascara solution to eyelashes uniformly without agglomeration and curl up the eyelashes easily because the brush bristles smoothly move through the eyelashes. However, because the mascara brush of the circular shape is cut into various shapes through the post-process, the brush bristles located at a position where the dorsal portions are formed are deteriorated in density, and hence, the mascara solution stained on the dorsal portions are easily separated and run down even by a small shock, it is difficult to apply the mascara solution with volume due to the lower density of the brush bristles at end portions of the dorsal portions, and it is also difficult to brush eyelashes evenly because the brush bristles of the dorsal portions are bent when the user brushes the eyelashes to which the mascara solution with viscosity is applied. 
     SUMMARY 
     Accordingly, the present invention has been made in an effort to solve the above-mentioned problems occurring in the prior arts, and it is an object of the present invention to provide a mascara brush for eyelash makeup, a mold for molding the mascara brush, and a method for molding a shape of bristles of a mascara brush for eyelashes, which includes the steps of: putting brush bristles in a dorsal portion molding hole of a mold for molding dorsal portions, which are radially on the basis of iron cores and enables a user to easily contact the brush to eyelashes when the user applies eyelash makeup; heating the mold in a molding furnace at heating temperature of 200° C. for 20 minutes so that the brush bristles made of nylon are formed in a shape corresponding to the dorsal portion molding hole of the mold; drawing out the mold from the molding furnace and extracting the brush bristles from the dorsal portion molding hole; holding the brush bristles on a drying rack and annealing them at room temperature to thereby form the dorsal portions formed radially, thereby preventing the mascara brush being bent when the user brushes eyelashes because the brush bristles having the dorsal portions have excellent rebound elasticity at their ends since the dorsal portions are not formed by cutting the brush bristles but the entire brush bristles have the same length uniformly to ends of the dorsal portions on the basis of the iron cores, storing a mascara solution between the brush bristles in safety and preventing the mascara solution from dropping down even though a shock is applied to the mascara during eyelash makeup so as to prevent the mascara solution from being stained on clothes because the brush bristles having the dorsal portions have the same length and the dorsal portions have higher density, applying the mascara solution with volume and providing a thick and beautiful eyelash makeup because the mascara brush is filled with the mascara solution of a sufficient amount between the brush bristles, and allowing a clean, neat, curved and beautiful eyelash makeup because the mascara brush has not only the dorsal portions with higher density of brush bristles but also dorsal portions with lower density of brush bristles enabling the user to evenly spread the mascara solution applied to the eyelashes by the dorsal portions with higher density. 
     To achieve the above objects, the present invention provides a method of molding a shape of mascara brush bristles for eyelash makeup including: a mascara preparing process of putting nylon bristles constituting brush bristles on two strands of iron cores and twisting them spirally several times so as to spread in all directions on the basis of the iron cores so that the brush bristles have a circular section; a mascara seating process of seating the brush bristles of the prepared mascara in a dorsal portion molding hole of a mold; a dorsal portion molding process of putting the mold, in which the brush bristles are seated, into a molding furnace and heating the molding furnace so that the brush bristles of the mascara made of nylon are thermally transformed into a form corresponding to the dorsal portion molding hole of the mold to thereby mold dorsal portions; a mascara extracting process of drawing out the mold and extracting the mascara brush having the dorsal portions by being thermally transformed in correspondence with the dorsal portion molding hole after the mold is heated and the brush bristles having the dorsal portions  21  are completely molded; and a plastic forming process of holding the mascara extracted from the dorsal portion molding hole of the mold on a drying rack so as to plastic-form the dorsal portions of the brush bristles formed by thermal transformation through an annealing process at room temperature. 
     To achieve the above objects, the present invention provides a mold used for molding a shape of mascara brush bristles for eyelash makeup including: a dorsal portion molding hole enabling the dorsal portions of the brush bristles of the mascara, which are formed by nylon bristles put on two strands of iron cores and twisted spirally several times so as to spread in all directions on the basis of the iron cores so that the brush bristles have a circular section, to be formed outwardly on the basis of the iron cores. 
     To achieve the above objects, the present invention provides a mascara brush for eyelash makeup including: two strands of iron cores; and brush bristles having dorsal portions, which are formed by nylon bristles put on the iron cores and twisted spirally several times so as to be formed radially on the basis of the iron cores, the brush bristles having the dorsal portions having the same length on the basis of the iron cores. 
     As described above, the mascara brush for eyelash makeup, the mold for molding the mascara brush, and the method for molding a shape of bristles of a mascara brush for eyelashes according to the present invention enable the user to easily contact the brush to eyelashes when the user applies eyelash makeup. The method for molding a shape of bristles of a mascara brush for eyelashes according to the present invention includes the steps of: putting brush bristles in a dorsal portion molding hole of a mold for molding dorsal portions, which are radially on the basis of iron cores; heating the mold in a molding furnace at heating temperature of 200° C. for 20 minutes so that the brush bristles made of nylon are formed in a shape corresponding to the dorsal portion molding hole of the mold; drawing out the mold from the molding furnace and extracting the brush bristles from the dorsal portion molding hole; holding the brush bristles on a drying rack and annealing them at room temperature to thereby form the dorsal portions formed radially, and the present invention provides the following effects. 
     First, the mascara brush according to the present invention can prevent the mascara brush being bent when the user brushes eyelashes because the brush bristles having the dorsal portions have excellent rebound elasticity at their ends since the dorsal portions are not formed by cutting the brush bristles but the entire brush bristles have the same length uniformly to ends of the dorsal portions on the basis of the iron cores. 
     Second, the mascara brush according to the present invention can store a mascara solution between the brush bristles in safety and preventing the mascara solution from dropping down even though a shock is applied to the mascara during eyelash makeup so as to prevent the mascara solution from being stained on clothes because the brush bristles having the dorsal portions have the same length and the dorsal portions have higher density. 
     Third, the mascara brush according to the present invention can apply the mascara solution with volume and providing a thick and beautiful eyelash makeup because the mascara brush is filled with the mascara solution of a sufficient amount between the brush bristles. 
     Fourth the mascara brush according to the present invention can enable the user to apply a clean, neat, curved and beautiful eyelash makeup because the mascara brush has not only the dorsal portions with higher density of brush bristles but also dorsal portions with lower density of brush bristles enabling the user to evenly spread the mascara solution applied to the eyelashes by the dorsal portions with higher density. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a flow chart of a method of molding a shape of mascara brush bristles for eyelash makeup according to the present invention. 
         FIG. 2  is a view of a mold used in the method of molding a shape of mascara brush bristles for eyelash makeup according to a preferred embodiment of the present invention. 
         FIG. 3  is a front view of  FIG. 2 . 
         FIG. 4  is a view showing a state where mascara brush bristles are seated in a dorsal portion molding hole of the mold of  FIG. 2 . 
         FIG. 5  is a view of a mold used in the method of molding a shape of mascara brush bristles for eyelash makeup according to another preferred embodiment of the present invention. 
         FIG. 6  is a plan view of  FIG. 5 . 
         FIG. 7  is a view showing a state where dorsal portions are formed on the brush bristles by the mold of  FIG. 2 . 
         FIG. 8  is a view showing a state where dorsal portions are formed on the brush bristles by the mold of  FIG. 5 . 
     
    
    
     DETAILED DESCRIPTION 
     A method of molding a shape of mascara brush bristles for eyelash makeup according to the present invention in order to achieve the above objects includes: 
     a mascara preparing process of putting nylon bristles constituting brush bristles  20  on two strands of iron cores  10 , twisting them spirally several times so as to spread in all directions on the basis of the iron cores  10  so that the brush bristles  20  have a circular section; 
     a mascara seating process of seating the brush bristles  20  of the prepared mascara  1  in a dorsal portion molding hole  110  of a mold  100 ; 
     a dorsal portion molding process of putting the mold  100 , in which the brush bristles  20  are seated, into a molding furnace with heat of 195° C. to 205° C. and heating the molding furnace for 17 minutes to 23 minutes so that the brush bristles  20  of the mascara  1  made of nylon are thermally transformed into a form corresponding to the dorsal portion molding hole  110  of the mold  100  to thereby mold dorsal portions  21 ; 
     a mascara extracting process of drawing out the mold  100  and extracting the mascara brush having the dorsal portions  21  by being thermally transformed in correspondence with the dorsal portion molding hole  110  after the mold  100  is heated and the brush bristles  20  having the dorsal portions  21  are completely molded; and 
     a plastic forming process of holding the mascara extracted from the dorsal portion molding hole  110  of the mold  100  on a drying rack so as to plastic-form the dorsal portions  21  of the brush bristles  20  formed by thermal transformation through an annealing process at room temperature. 
     It is preferable that heating temperature of the molding furnace is 200° C. and a heating period of the mold  100  is 20 minutes. 
     The mold  100  used for molding the shape of the brush bristles of the mascara  1  includes the dorsal portion molding hole  110  enabling the dorsal portions  21  of the brush bristles  20  of the mascara  1 , which are formed by nylon bristles put on two strands of iron cores and twisted spirally several times so as to spread in all directions on the basis of the iron cores  10  so that the brush bristles  20  have a circular section, to be formed outwardly on the basis of the iron cores  10 . 
     As described above, the mold  100  having the dorsal portion molding hole  110  has different structures according to shapes and density of the dorsal portions  21 . 
     In the case that the dorsal portions  21  are formed in a cross shape, the mold  100  includes a lower mold  120  and an upper mold  130 . The lower mold  120  includes: molding apertures  121  having a width corresponding to a diameter of the circular brush bristles  20  and respectively having arranging dorsal portion molding slots  122 , each of which is formed in the floor surface thereof and has a depth corresponding to a radius of the brush bristles  20  and a narrow width; and guide posts  123  formed at upper faces of both sides thereof for guiding the upper mold  130 . The upper mold  130  includes: guide holes  133  formed at both sides thereof to which the guide posts  123  of the lower mold  120  are inserted; protrusions  131  corresponding to the molding apertures  121  of the lower mold  120 ; arranging dorsal portion molding slots  132  formed at the center corresponding to the arranging dorsal portion molding slots  122  of the molding apertures  121 ; and bolt holes  134  formed corresponding to bolt holes  124  of the lower mold  120  for inserting assembly bolts  135  thereinto. The dorsal portion molding hole  110  is formed in the cross shape when the lower mold  120  and the upper mold  130  are assembled together, and thereby, the brush bristles  20  are molded in such a way as to have the dorsal portions  21  respectively having the applying dorsal portions  21   a  with higher density and the arranging dorsal portions  21   b.    
     Arranging dorsal portions  21   b  with lower density of the brush bristles are formed by the arranging dorsal portion molding slots  122  and  132  of the lower mold  120  and the upper mold  130 , and applying dorsal portions  21   a  with higher density of the brush bristles are formed between the lower mold  120  and the upper mold  130 . 
     The mold  100  may include a radial dorsal portion molding hole  110  according to another preferred embodiment of the present invention. In this embodiment, the mold  100  includes: an insertion hole  111  formed at the center thereof in such a manner that iron cores  10  are inserted thereinto; radial molding grooves  112  formed on the basis of the insertion hole  111  for molding the dorsal portions  21  radially; and end portions  113  of the radial molding grooves  112 , each having a length corresponding to a radius of the circular brush bristles  20  on the basis of the insertion hole  111  in which the iron cores  10  are inserted. 
     The mold  100  having the radial dorsal portion molding hole  110  includes inclined surfaces  114 , which gradually lower toward the radial molding grooves  112  and are continuously repeated in a concavo-convex form, such that the brush bristles  20  can be easily inserted into the radial molding grooves  112 . 
     In the case of the brush bristles of the mascara manufactured by the above molding method, the nylon bristles constituting the brush bristles  20  are put on the two strands of the iron cores  10  and twisted spirally several times, so that the dorsal portions  21  of the nylon bristles are formed radially on the basis of the iron cores  10 , and the brush bristles  20  having the dorsal portions  21  have the same length on the basis of the iron cores  10 . 
     The dorsal portions  21  may include the applying dorsal portions  21   a  with higher density of the brush bristles  20  and the arranging dorsal portions  21   b  with lower density of the brush bristles  20 , and alternatively, may have uniform density. 
     When the brush bristles  20  having the applying dorsal portions  21   a  and the arranging dorsal portions  21   b , as shown in  FIGS. 2 and 3 , in a state where the upper mold  130  is separated from the lower mold  120 , the brush bristles  20  of the mascara  1  are located in the molding hole  121  of the lower mold  120  as shown in  FIG. 3 . 
     In the state where the brush bristles  20  of the mascara  1  are located in the molding hole  121  of the lower mold  120 , the upper mold  130  is joined to the lower mold  120 . 
     As described above, when the upper mold  130  is joined to the lower mold  120 , the protrusions  131  are inserted into the molding apertures  121  of the lower mold  120 , and hence, the brush bristles  20  having the dorsal portions  21  are formed, and in this instance, the applying dorsal portions  21   a , which has higher density and good rebound elasticity and allow the user to easily apply a mascara solution to eyelashes, are in a temporarily molded state, and at the same time, the arranging dorsal portions  21   b  are also in a temporarily molded state in the arranging dorsal portion molding slots  122  and  132  respectively formed in the lower mold  120  and the upper mold  130  (See  FIG. 4 ). 
     As described above, when the upper mold  130  and the lower mold  120  are joined together, the assembly bolts  135  are fastened to the bolt holes  124  of the lower mold  120  so as to keep the joined state. 
     In the above state, the mold  100  is inserted into a molding furnace, heated at heating temperature of 195° C. to 205° C. for 17 minutes to 23 minutes, and then, drawn out from the molding furnace. The mascara  1  is extracted from the mold  100  drawn out from the molding furnace, and then, annealed at room temperature, so that the brush bristles  20  having the dorsal portions  21 , which have the applying dorsal portions  21   a  and the arranging dorsal portions  21   b , are manufactured as shown in  FIG. 7 . 
     In order to extract the brush bristles  20  having the dorsal portions  21 , which have the applying dorsal portions  21   a  and the arranging dorsal portions  21   b , the assembly bolts  135  are released, and then, the upper mold  130  is separated from the lower mold  120 . 
       FIGS. 5 and 6  illustrate a mold according to another preferred embodiment of the present invention. In this embodiment, the dorsal portions  21  are radially formed on the basis of the iron cores  10 , and when the brush bristles  20  are pushed into the radial molding grooves  112  of the dorsal portion molding hole  110  in a state where the iron cores  10  coincide with the insertion hole  111  of the center, the brush bristles  20  are guided to the inclined surfaces  114  so that the brush bristles  20  are inserted into the molding hole  110  neatly. 
     The inclined surfaces  114  have a form that ridges and valleys are continuously repeated because a portion where the dorsal portion molding hole  110  is located is lower and a point where the dorsal portion molding holes  110  are equally divided is higher. 
     The mold  100 , in which the brush bristles  20  are inserted into the dorsal portion molding hole  110  in such a way that the dorsal portions  21  are temporarily molded, is inserted into a molding furnace with heating temperature of 195° C. to 205° C., heated for 17 minutes to 23 minutes, and then, drawn out from the molding furnace. The mascara  1  is extracted from the mold  100  drawn out from the molding furnace, and then, annealed at room temperature, so that the brush bristles  20  having the dorsal portions  21  are manufactured as shown in  FIG. 8 . 
     The dorsal portions  21  of the brush bristles  20  may be formed in a straight form or in a three-way form.