EP2915456B1 - Mold for the manufacture of leads of cosmetic pencils - Google Patents

Mold for the manufacture of leads of cosmetic pencils Download PDF

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Publication number
EP2915456B1
EP2915456B1 EP15157790.5A EP15157790A EP2915456B1 EP 2915456 B1 EP2915456 B1 EP 2915456B1 EP 15157790 A EP15157790 A EP 15157790A EP 2915456 B1 EP2915456 B1 EP 2915456B1
Authority
EP
European Patent Office
Prior art keywords
mold
cursor
runner
fluid
base
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP15157790.5A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2915456A1 (en
Inventor
Nicolò Larceri
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Chromavis SpA
Original Assignee
Chromavis SpA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Chromavis SpA filed Critical Chromavis SpA
Publication of EP2915456A1 publication Critical patent/EP2915456A1/en
Application granted granted Critical
Publication of EP2915456B1 publication Critical patent/EP2915456B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • A—HUMAN NECESSITIES
    • A45—HAND OR TRAVELLING ARTICLES
    • A45D—HAIRDRESSING OR SHAVING EQUIPMENT; EQUIPMENT FOR COSMETICS OR COSMETIC TREATMENTS, e.g. FOR MANICURING OR PEDICURING
    • A45D40/00—Casings or accessories specially adapted for storing or handling solid or pasty toiletry or cosmetic substances, e.g. shaving soaps or lipsticks
    • A45D40/16—Refill sticks; Moulding devices for producing sticks

Definitions

  • the present invention refers to a mold for the manufacture of leads for cosmetic pencils, and specifically for make-up.
  • Propelling pencils can be, for instance, of automatic or screwable types.
  • the molds known so far are usually made of aluminium or steel and feature a plurality of runners having a diameter substantially equal to that of the lead to be molded.
  • the make-up product is prepared by hot mixing its various components (waxes, oils, pigments, pearlescent substances, excipients, actives, perfumes/flavorings, and additives/antioxidants).
  • the fluid mix is subsequently cast into the runner properly closed at one of its ends by a plug or stop external to the mold which forms the point of the lead. Casting takes place while the product is still hot hence fluid. Then it is waited until the product solidifies by properly cooling the mold and then, having removed the closing of the hole, the various leads are extracted.
  • the pushers according to the known art are substantially very long lifting irons, much longer than the depth of the runners, provided with a tip that features a conical hollow.
  • the pusher couples with the point of the lead and penetrates the runner in the direction opposite to that of the casting itself.
  • the pusher penetrates the runner all along its extension, thus pushing the lead out on the opposite side.
  • the conical hollow tip of the pusher coupling with the point of the lead decreases its possibility of getting broken; however in many cases is the alignment between the point of the lead and the cavity of the pusher not perfect and consequently the lead or its point snaps.
  • Patent document US1312189 describes a mold for the manufacture of candles and similar products, soaps or other articles that can be obtained through a molding process with different cross sections.
  • a mold consisting of a hollow water-box, closed by a top plate on the upper side and by a bottom on the lower side.
  • the top plate has a plurality of through openings of equal diameters and the bottom has a plurality of threaded holes also of equal diameters.
  • the holes are axially aligned with the openings, i.e. their axes are coaxial to those of the openings of the top plate.
  • the water-box is capable of housing molds or cylindrical bodies of different cross sections; such bodies are provided with terminal flanges whose overall diameter equals that of the openings of the top plate and with lower ends externally threaded suitable for being inserted and screwed in the threaded holes of the bottom of the water-box.
  • said molds are detachable from the water-box and molds are used having the desired transversal section as a function of the product to be manufactured.
  • a hollow adapter where the lower end of the mold or cylindrical body is screwed in and in turn screws in the hole of the bottom of the water-box.
  • the piston rod moves inside the adapter.
  • the pistons operate as expellers of the candle from its respective mold after being manufactured.
  • EP0966898 describes a mechanical filling process of a container for cosmetic product and an apparatus for carrying out said process.
  • EP096898 is the closest prior art to the present invention and the apparatus disclosed in this prior patent has features which can be read in the preamble of the independent claim 1 of the present patent.
  • EP0966898 does not describe any means to let the air between any cursor and the fluid filled into the mold to be discharged outside the chamber wherein the fluid is filled. Therefore, even if a very limited amount of air between the cursor and the cosmetic product fluid remains, said air can cause babble formation inside the cosmetic product which render the cosmetic product very brittle and delicate during production and its moving during the production step from a working station to another.
  • EP2465375 describes a mold extraction device for cosmetic pencil cores. It comprises fixing means for a mold in which at least one core has been previously cast in a through hole provided in said mold, locking means for a core holder to fix this latter coaxially with the through hole of the mold in which the ore was cast, at least one pusher positioned coaxially with the hole and of diameter such as to be able to penetrate into it.
  • Drive means are provided for mutually moving said pusher and said mold from a first position in which said pusher is external to said hole to a second position in which said pusher is internal to said hole and occupies it for a length such as to be able to expel the core present in the hole.
  • the device presents means for injecting pressurized fluid between that pusher surface facing the core and said core, such as to facilitate core extraction from the hole.
  • a purpose of the present invention is therefore to provide an enhanced mold for casting leads for make-up that overcomes the drawbacks of the known art.
  • a purpose of the present invention is to provide a mold that is easily transportable from a working station to another one also when the leads have already been cast into the mold and that allows to draw the leads effectively, without damaging them.
  • the present invention also allows to optimally lubricate the runners between any two consecutive castings by means of appropriate oils.
  • a mold is shown for the manufacture of leads of make-up pencils, indicated by the reference numeral 1 as a whole.
  • the mold comprises a single-block main body 2 provided with centering means 3 for its positioning on a base 4 (or 4A and 4B as shown in figures 2 and 3 ).
  • the single-block main body comprises a number of seats 3 suitable for housing centering pins 5 which project from the base 4 (or 4A and 4B).
  • the centering pin is apparently not perfectly in contact with the seats 3 of the main body 2, wherein it is housed, but this is solely due to a simplification of the drawing where the clearances present between the base and the main body are exaggerated.
  • the centering pins 5 projecting from the base make it possible an accurate coupling between the base 4 and the body 2.
  • Centering means different from the pins 5 can be used indeed between the base and the body 2, as it is evident to those skilled in this sector.
  • the single-block main body 2 features a plurality of runners 6, directly machined in such body crossing the main body from one side to the other. So, the mold consists of one body where there are provided holes suitable for operating as runners.
  • the mold comprises a cursor 7 inserted in every runner.
  • all cursors 7 are located on the bottom of the runner (close to the base) in a configuration ready to receive the fluid destined to form the lead.
  • Every cursor is an independent element inserted in its corresponding runner and is not connected to anything outside said runner 6. It features an overall height H shorter than the depth C of the runner, otherwise there would not be a space available in the runner for the fluid to cast; however it is possible to obtain leads of different lengths by positioning the cursor at different heights.
  • the cursor 7 a height in the range from 5 to 30% of the height of the runner.
  • the cursor has a cavity 7A at one of its ends suitable for receiving said fluid to form a point for the lead. Every cursor 7 is slidable in its respective runner to contribute to or facilitate the extraction of the lead once this is solidified.
  • second base 4B features a number of holes F or non-intercepted openings in correspondence with the bottom of every runner.
  • corresponding holes are also present in the first base 4A, but they are closed by appropriate inserts T, which make the contact surface between the main body and the base substantially devoid of openings at least in correspondence with the bottom of the runners. It is worth saying that applying inserts T to close the holes F is advantageous in that it makes it possible to implement one and the same base structure only which can be used as a first base 4A as well as a second base 4B, provided that inserts T are used.
  • the leads M are thus extracted from the individual runners 6 thanks to the push exerted by the rods 8 leaning on the cursors 7.
  • every cursor 7 comprises constraint means 10 which constrain them to said single-block body 2, suitable for holding the cursor itself inside its respective runner 6 also when the main body is separated from the base.
  • constraint means 10 comprise at least one O-ring 12 housed in a groove 11 specifically provided for this purpose perimetrically on the cursor.
  • O-rings are present for every cursor.
  • the O-ring 12 enables the cursor 7 to hermetically slide, with a slight friction, on the surface that defines the runner 6. Whenever the cursor is not pressed by the extractor 8, it remains in its own position, even if loaded by the weight of the fluid just cast in its respective runner. This takes place thanks to the action exerted by every O-ring 12 onto the wall of its corresponding runner 6.
  • Figure 5 shows that the cavity 7A present in the cursor has the shape of a cone with a radiused or rounded vertex.
  • An axial air vent 7B is also present which allows the air trapped between the fluid and the cursor to escape toward the outside of the mold while casting is made. Air outlet takes place through a space anyway present between every plug T and its corresponding hole F because every plug is not hermetically associated with the latter.
  • the constraint means 10 perform a sealing action only on the wall of said runner 6. In another embodiment, not according to the invention, it is not absolutely necessary that the constraint means perform a sealing action on the surface of the runner, but it is possible that the O-rings operate just as constraint means between the cursor and the runner.
  • the mold according to the present invention is particularly useful in a machine 30 like that illustrated in figure 4 .
  • This machine comprises a first rotary board 20 and a second rotary board 21, the former equipped with four first bases 4A and the second on which four second bases 4B are mounted.
  • a loading station C is present to load the molds of it respective board as well as an unloading station S.
  • the machine 30 comprises a refrigerator 23 internally to which a first conveyor belt 24 runs, and externally to the refrigerator there is a second conveyor belt 25 which connects the unloading station S2 of the second board to the loading station C1 of the first board.
  • a lubrication station 26 is present in the path of the second conveyor belt to lubricate the runner (which is important to extract the leads which are made of a material that, once coagulated, features a high friction coefficient), whereas at least one casting station 27 is present in correspondence with the first board.
  • an extraction station 28 assisted by a pencil loading/unloading robot 29 to extract the leads.
  • the operation of the machine 30 is the following.
  • the loading station C1 picks up a mold 2 from the second conveyor belt 25, which is set to the conditions depicted in figure 2 , and deposits it onto the first base 4A which is opposite to the loading station C1.
  • the board rotates clockwise and brings the first base 4A along with its mold under the casting station 27, where the fluid being at the right temperature is injected into the individual runners 6. Once the runners are filled, the board rotates again up to bringing the mold in a position opposite to the unloading system S1, which picks up the mold 2 which is full from the base 4A and deposits it onto the first conveyor belt 24.
  • Such first conveyor belt moves at a preset speed in the refrigerator 23, hence the just cast fluid gets properly cool.
  • the mold 2 is located opposite to the loading system C2 and it is picked up from the latter and is positioned on a second base located on the second rotary board 21. It rotates clockwise up to bringing the mold to the extraction station where the extractors 8 expel the leads as shown in figure 3 .
  • Advantageously are the leads expelled from the mold and simultaneously (with the same movement) inserted in propelling pencils properly located just above the individual runners of the mold.
  • the extractors push the cursors up to making them project as much as necessary from the runners.
  • the O-rings constrain the cursors to the main body, so as to prevent the latter from going out of the runners even during successive handlings of the mold 1.
  • the robot 29 picks up and sends them to the next working stations.
  • the rotary board 21 rotates again so as to bring the mold opposite to the unloading system S2, which picks up the latter from the board and positions it on a further base (similar to the second base) provided on the second conveyor belt.
  • the mold 2 is brought to a lubrication station 26 where the runners are lubricated from bottom up in advance (via small probes penetrating the runners from bottom up and spraying a lubricant, e.g. a silicone spray, which operates as a substance used to detach the cosmetic product remained in the individual runners 6), and subsequently a number of pushers (fully similar to those of the extraction station, but acting from top down of the mold in the direction of the cast), push the cursors against the bottom of the mold, in the position shown in figure 2 .
  • a lubricant e.g. a silicone spray
  • the lubricant is perfectly removed from the surface of the runner, so as not to generate defects in the next cast.
  • the single-block mold is preferably not made of a metal, but above all the cursors are short and anyway constrained to the mold and independent of the pushers (which facilitates mold handling).
  • the true extractors used to insert the lead into the pencil are only there where they are necessary (and are separate from the cursors 7) and are present at the end of the manufacturing process, in the rotary board 4B.
  • the method according to the invention prevents the point of the lead (the most fragile part of a cosmetic pencil) from getting broken while the lead itself is inserted into the body of the pencil.
  • the lead is cast into the "body of the pencil" which is supported by a metal mold; thereafter the point is made. Consequently, a force must be generated between the latter and the mold to detach it, which leads to breakages.

Landscapes

  • Moulds For Moulding Plastics Or The Like (AREA)
  • Cosmetics (AREA)
EP15157790.5A 2014-03-06 2015-03-05 Mold for the manufacture of leads of cosmetic pencils Not-in-force EP2915456B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITMI20140348 2014-03-06

Publications (2)

Publication Number Publication Date
EP2915456A1 EP2915456A1 (en) 2015-09-09
EP2915456B1 true EP2915456B1 (en) 2018-02-21

Family

ID=50877563

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15157790.5A Not-in-force EP2915456B1 (en) 2014-03-06 2015-03-05 Mold for the manufacture of leads of cosmetic pencils

Country Status (2)

Country Link
EP (1) EP2915456B1 (es)
ES (1) ES2674385T3 (es)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1312189A (en) 1919-08-05 Tram locke
US4543702A (en) * 1984-05-14 1985-10-01 Satoh Seiki Co., Ltd. Fully automatic method and apparatus for assembling stick-type cosmetics
IT1301771B1 (it) * 1998-06-22 2000-07-07 Laffon Spa Procedimento di riempimento meccanico di un contenitore per prodotticosmetici.
IT1403267B1 (it) * 2010-12-17 2013-10-17 Chromavis Spa Dispositivo di sformatura di mine di matite truccanti

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
EP2915456A1 (en) 2015-09-09
ES2674385T3 (es) 2018-06-29

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