WO1994013461A1 - Appareil et technique de moulage par injection d'un monolithe en plastique - Google Patents

Appareil et technique de moulage par injection d'un monolithe en plastique Download PDF

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Publication number
WO1994013461A1
WO1994013461A1 PCT/US1993/011825 US9311825W WO9413461A1 WO 1994013461 A1 WO1994013461 A1 WO 1994013461A1 US 9311825 W US9311825 W US 9311825W WO 9413461 A1 WO9413461 A1 WO 9413461A1
Authority
WO
WIPO (PCT)
Prior art keywords
branches
injection molding
bristles
mold
resin material
Prior art date
Application number
PCT/US1993/011825
Other languages
English (en)
Inventor
Ronald William Klinkhammer
Original Assignee
Oral Logic, Inc.
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 Oral Logic, Inc. filed Critical Oral Logic, Inc.
Priority to AU60485/94A priority Critical patent/AU6048594A/en
Publication of WO1994013461A1 publication Critical patent/WO1994013461A1/fr

Links

Classifications

    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46B—BRUSHES
    • A46B3/00—Brushes characterised by the way in which the bristles are fixed or joined in or on the brush body or carrier
    • A46B3/005—Bristle carriers and bristles moulded as a unit
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/26—Moulds
    • B29C45/2626—Moulds provided with a multiplicity of narrow cavities connected to a common cavity, e.g. for brushes, combs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/26—Moulds
    • B29C45/34—Moulds having venting means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D21/00—Producing hair combs or similar toothed or slotted articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/26—Moulds
    • B29C45/37—Mould cavity walls, i.e. the inner surface forming the mould cavity, e.g. linings
    • B29C2045/378—Mould cavity walls, i.e. the inner surface forming the mould cavity, e.g. linings built by a stack of modular elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/42—Brushes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/42—Brushes
    • B29L2031/425—Toothbrush

Definitions

  • This invention relates to an apparatus and technique for molding a plastic monolith by the injection molding process, and in particular, a plastic monolith comprised of a base of plastic resin material having elongated bristles of the same resin material monolithically relatively upstanding on one side thereof so that the monolith can be used as a brush.
  • the apparatus and technique are particularly applicable to the injection molding of a tooth cleaning head for the arm of a tooth ⁇ brush, and especially the wing-like gripper elements for the arms of a straddle type toothbrush.
  • the present Application is a Continuation in Part of Application Serial No. 499,022 filed on March 26, 1990 and entitled TOOTH CLEANING DEVICE AND METHOD FOR MAKING THE SAME. It is also a Continuation in Part of Application Serial No. 924,099 filed on August 3, 1992 and entitled STRADDLE TYPE TOOTH BRUSHING DEVICE. Both relate to straddle type tooth- brushes, although in Application Serial No. 499,022, the gripper elements are flexibly interconnected by an articulated linkage therebetween, while in Application Serial No. 924,099 the gripper elements are independent of one another on the outboard end portions of the arms.
  • the present invention is nevertheless applicable to the molding of each by the injection molding process, since the gripper elements of each constitute plastic monoliths of the type described.
  • Background of the Invention In Application Serial No. 499,022, an apparatus and technique were disclosed wherein a mass of plastic resin material was injected into a mold cavity which was defined by the mutually opposing faces of a pair of relatively reciprocable members on opposing sides of a plane of the mold, and had a cross section corresponding to the body of the base of the monolith to be molded.
  • one of the mold cavity defining members had a set of elongated bristle defining branches of the cavity formed therein, which extended from the face of the one mold cavity defining member along longitudinal axes transverse the plane of the mold and terminated at the ends thereof relatively remote from the face of the one mold cavity defining member.
  • the gas in the cavity was displaced into the branches by the resin material, the gas was discharged in turn to a low pressure zone at the terminal ends of the branches so as to make way for the formation of the bristles of the monolith therein.
  • a substrate with a substantially planar face was enclosed in the cavity so that the face thereof was spaced apart from the face of the one mold cavity defining member, the mass of resin material was injected into the space between the faces of the substrate and the one mold cavity defining member to form a plastic monolith adapted as a bristle supporting overlay for the substrate.
  • the substrate was secured to the plastic monolith to form a backing therefor, for example, by interposing spacer elements between the substrate and the faces of the mold cavity defining members on the opposing sides of the plane of the mold to substantially surround the substrate with an unoccupied portion of the cavity, into which the mass of plastic resin material was injected to substantially encircle the substrate with resin material in forming the base of the monolith.
  • the gripper elements themselves, the outboard end portions of the arms of the brush were enclosed in a pair of mold cavities corresponding to the bodies of the elements, and spacer elements were interposed between the outboard end portions of the arms and the faces of the members to substantially surround the end portions of the arms with unoccupied portions of the cavities.
  • a mass of the resin material was injected into the unoccupied portions of the cavities to substantially encircle the outboard end portions of the arms with the resin material, and when the gas in the cavities was displaced into the branches by the resin material, the gas discharged from the branches at the terminal ends thereof to enable the bristles to form on the bases of the gripper elements.
  • the faces of the pair of mold cavities defining members were given a series of serially interconnected cavities having cross sections corresponding to the bodies of the gripper elements and the linkage therebetween, and the mass of resin material was injected into the series of cavities to form a monolith which was referred to as a "cowling," since when the brush was put to use, the monolith was reentrantly folded about the arms to form a taco shell shaped head which could be straddled about a row of teeth and translated along the length of the row while the gripper elements were applied to the outside and inside faces of the teeth to clean them.
  • I have discovered a way not only to reduce the cost of the mold, but also to gain a number of other advantages in the manufacture of the monolith, and in the character of the monolith itself.
  • I now close the terminal ends of the branches at the longitudinal axes thereof, and form a fluid flow path for gas in the one mold cavity defining member, which opens into the respective branches adjacent the terminal ends thereof, but discharges transverse the axes of the branches to a low pressure zone spaced apart from the branches so that the gas in the cavity need not discharge at the terminal ends of the branches any longer.
  • the fluid flow path for gas is formed by subdividing the one mold cavity defining member into a pair of plate-like members which are juxtaposed to one another substantially on parallels to the plane of the mold to form a joint therebetween, and spacing apart the faces of the plate-like members which are mutually opposed to one another across the joint to form slit-like fluid flow annuli about the respective branches which discharge to a low pressure zone opening at the outer periphery of the one mold cavity defining member.
  • the mutually opposing faces of the plate-like members are abutted with one another at the joint to form the annuli, and one of the faces of the plate-like members is scored to form a low pressure zone in the joint which discharges at the outer periphery thereof.
  • the plate ⁇ like member relatively adjacent the cavity is given a gallery of holes therein on axes transverse the plane of the mold to form the branches, and the face of the plate ⁇ like member relatively remote from the cavity, is dimpled at the longitudinal axes of the holes, to round-off the tips of the bristles formed therein.
  • the branches them- selves are formed by subdividing the one mold cavity defining member into a pair of plate-like members which are juxtaposed to one another substantially on parallels to the plane of the mold to form a joint therebetween, and giving the plate-like members galleries of holes therein which are aligned with one another on axes transverse the plane of the mold to form the branches.
  • the cross sections of the respective galleries of holes can be varied from one plate-like member to the other to vary the cross sections of the shank portions and the tip portions of the respective bristles formed on the opposing sides of the joint between the pair of plate-like members. This includes varying the cross sections of the respective portions transverse the axes of the branches from one side of the joint to the other; and/or varying the cross sections of the respective portions in planes coincident with the axes of the branches.
  • the diameters of the holes in the respective galleries of holes can be varied from hole to hole, including varying the diameters of the holes in the plate ⁇ like member relatively adjacent the cavity, at the face of the one mold cavity defining member, and varying the diameters of the holes in the plate-like member relatively remote from the cavity, at the joint between the plate ⁇ like members.
  • a substrate may be enclosed in the cavity and a bristle supporting plastic overlay for the substrate may be formed between the face of it and the face of the one mold cavity defining member.
  • the substrate may be secured to the overlay to form a backing therefor; and in addition, the apparatus and technique may be used to form gripper elements on the outboard end portions of the arms of a straddle type brush, as well as a full cowling on the outboard end portions of the arms, as was done in Application Serial No. 499,022.
  • Figure 1 is a vertical cross sectional schematic of that portion of the mold
  • Figure 2 is a further vertical cross sectional schematic of that portion of the mold, illustrating the fluid flow path by which the gas discharges from the cavity of the mold;
  • Figure 3 is a cross sectional view of the mold along the line 3-3 of Figure 1;
  • Figure 4 is a cross sectional view of the mold along the line 4-4 of Figure 1;
  • Figure 5 is a cross sectional view of the mold along the line 5-5 of Figure 3;
  • Figure 6 is an exploded part perspective view of the mold at a bristle forming branch of the cavity, as well as a part perspective view of the strand of bristle formed in the same;
  • Figure 7 is a cross sectional view of an alternative bristle forming branch when the diameters of the branches are varied from branch to branch;
  • Figure 8 is another cross sectional view of such a branch when the diameters of the branches are so varied from branch to branch.
  • the mold has an outer case 2, a block-like lining 4 there- within, and a pair of heat conductive inserts 6', 6" enclosed within the lining.
  • the case 2 is box-like and comprises a pair of relatively upper and lower casing members 2', 2" which have corresponding quadrilateral recesses 8 in the opposing faces 10 thereof, that register with one another to form an oversized cavity within the case when the members 2', 2" are superposed on one another as shown.
  • the casing members are mounted on a pair of opposing platens (not shown) , the upper of which is reciprocable in relation to the lower platen, so that the two casing members can be parted from one another at the plane of their faces 10 when it is time to remove the molded product from the mold.
  • the lining 4 is adapted to fill the cavity of the case 2 and comprises a pair of relatively upper and lower intermediate members 4', 4" which have quadrilateral recesses 12 in the opposing faces 13 thereof that form a smaller cavity when the members are superposed on one another in the cavity of the case as shown.
  • the intermediate members of the lining are captive within the respective recesses 8 of the casing members, and when superposed on one another, are flush with the faces 10 of the casing members in the plane thereof.
  • the inserts 6', 6" meanwhile, are captive within the respec ⁇ tive recesses 12 of the lining to more loosely fill the cavity thereof, and to assume a coplanar condition with the faces 10, 13 of the members 2' , 2 and 4', 4" at the plane thereof when the case 2 is closed in the molding operation.
  • the inserts 6 ' , 6" also have a cross section corresponding to the body of the cowling 22 to be molded in the mold, although the main hollow 18 of the cavity 16 for this purpose is defined by the relatively upper insert 6', while the relatively lower insert 6" has the sets of elongated bristle defining branches 20 for the wings 30 of the cowling.
  • the branches 20 extend from the face 15 of the relatively lower insert 6" along longitudinal axes 24 transverse the plane of the faces 10, 13 of the respective upper and lower mold assemblies, and terminate at the ends thereof relatively remote from the face 15 of the relatively lower insert.
  • the outline 26 of the cowling 22 can be seen in Figures 3 and 4, and as in the past, the cowling comprises a sheet of reentrantly foldable plastic resin material having fields of bristle 28 upstanding on the wings 30 thereof, at corresponding sides of the cowling, as well as a third field of bristle 28 upstanding on the midsection 32 thereof, on the same side of the cowling.
  • the cowling also has added portions 34 between each of the wings and the midsection thereof, which provide fold lines 35 at which the cowling can be reentrantly folded into a taco shell shaped configuration.
  • the cowling 22 is molded in the flat, as seen in Figures 3 and 4, and in addition, as before, is molded about the jaws or other outboard end portions 36 of a pair of spaced generally parallel arms (not shown) that are operatively disposed at the head of the toothbrush, with an elongated slot (not shown) extending therebetween.
  • the outboard end portions of the arms Prior to the molding operation, the outboard end portions of the arms are positioned in the plane 10, 13 of the cavity 16 and are enclosed within the cavity, with sets of studs 38 upstanding on the opposing sides 40 thereof to form spacer elements between the faces 14, 15 of the inserts and the adjacent sides 40 of the outboard end portions of the arms.
  • plastic resin material 42 is injected into the mold through an inlet or runner 43 from the sprue (not shown) of the injection molding machine, at the plane of the faces, the resin material occupies the open portions 44 of the cavity between the faces of the inserts and the adjacent sides 40 of the outboard end portions 36 of the arms, and substantially encircles the outboard end portions of the arms to secure the resulting plastic monolith to the arms.
  • the lower insert 6" comprises a stack of three flat rectangular plates 48, 50, 52 which are bolted (not shown) or otherwise clamped together and mounted in the recess 12 of the lower member 4" of the lining to form the lower insert.
  • the uppermost and intermediate plates 48, 50 of the stack have a gallery of holes 54 therethrough on the vertical axes 24 of the branches, and the holes open into the upper face 15 of the uppermost plate and the lower face 56 of the intermediate plate.
  • the lowermost plate 52 is closed at the upper face 58 thereof, and though abutted with the lower face 56 of the intermediate plate, forms slit-like fluid flow annuli 56, 58 about the respective holes 54 at the joint between the faces.
  • the annuli open to the outer periphery 12 of the joint and enable the gas in the cavity 16 to discharge from the branches 20.
  • a limited number of grooves 62 is provided in the face 58 of the lowermost plate 52 to form a low pressure zone between the annuli and the outer periphery of the joint.
  • the number, size and location of the grooves 62 is such that the back pressure in the annuli always exceeds the flash point of the resin under the temperature and pressure at which the resin is introduced to the mold.
  • the grooves are also present in sufficient number, size and location to enable the resin to charge through the open portions of the cavity and into the branches, at the optimum fill time for the resin in such an operation.
  • the balance between the two factors is readily determined by conventional empirical or analytical methods.
  • the lower insert is also sufficiently loosely seated in the recess 12 of the lower member 4" of the lining that the gas discharging at the outside ends of the grooves 62 readily discharges upwardly to the plane of the faces 10, 13, where the two mold assemblies 2, 4 always have sufficient an annulus therebetween to enable the gas to readily escape, as indicated by the arrows 64.
  • the gas also tends to discharge to a more limited extent at the joint between the lower and upper faces 66 and 68 of the uppermost and intermediate plates, and thence in the same path as that taken by the gas discharg ⁇ ing at the joint 56, 58 between the intermediate and bottommost plates.
  • the upper surface 58 of the bottommost plate 52 has a series of dimples 60 therein at the axes 24 of the holes 54, which are substantially hemispherical to give the tips 61 of the bristles a similar outline.
  • the insert is far cheaper to make; and in addition, the respective galleries of holes 70 and 72 in the uppermost and intermediate plates, which form the gallery of holes 54 defining the branches of the cavity, can be given differing cross sections and diameters, from hole to hole within a plate, and/or differing diameters and cross sections from plate to plate.
  • the holes of the respective plates have a common taper from the top of the insert to the bottom of the intermediate plate, and the taper is adapted so that the tip portions 74 of the bristles are adapted to reach into the sulcus of the teeth when the brush is put to use.
  • the holes 70 in the uppermost plate 48 have fluting 76 symmetrically spaced thereabout to form ribs 78 on the shank portions 80 of the bristles that will, meanwhile, give the bristles strength and rigidity. See Figure 6.
  • bristles with such ribs 78 thereon are employed in the center regions of the fields of bristle on the wings 30 of the cowling, while bristles without ribs, are employed around the perimeter of the wings, as seen in Figure 3 wherein symbols of appropriate outline are used for the respective ribbed and unribbed bristles.
  • the bristles in these areas are preferably more flexible and more readily deformable than those overlaid on the jaws 36 of the arms.
  • a similar effect is achieved by varying the diameters of the holes 70 in the uppermost plate 48.
  • any one of several conventional techniques such as chemical etching can be employed to form the holes 70, 72 and the various cross sections thereof, it is preferred to form them with an electric discharge machine, starting by forming pilot holes on the axes of the branches 20, and then using rotating wires to give the respective holes the desired taper and diameter, or selectively applied wires to form the sets of flutes 76 about the holes 70 in the uppermost plate.
  • an electric discharge machine starting by forming pilot holes on the axes of the branches 20, and then using rotating wires to give the respective holes the desired taper and diameter, or selectively applied wires to form the sets of flutes 76 about the holes 70 in the uppermost plate.
  • each operation is computer driven, and together they are far less expensive than fashioning the lower insert from a single solid piece.
  • Copper beryllium alloys dissipate heat best, but hardened stainless steels have a higher duro- meter than copper beryllium alloys.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

Le monolithe en plastique selon l'invention est constitué d'une base (30) en résine de plastique présentant des poils allongés (28) fabriqués dans la même matière résineuse disposés verticalement par rapport au monolithe, sur un côté de celui-ci, de façon que ce dernier puisse être utilisé comme une brosse. On injecte une masse de résine de plastique (42), au niveau de 43, dans une cavité de moule (18) définie par les faces opposées (14, 15) d'une paire d'éléments pouvant être animés d'un mouvement relativement alternatif (6, 6') situés sur les côtés opposés d'un plan (10, 13) du moule (2, 4), et présentant une section correspondant au corps de la base du monolithe. On déplace ensuite le gaz situé dans la cavité (18) dans un ensemble de poils allongés définissant les branches (20) de la cavité, lesquelles s'étendent depuis la face (15) de l'élément définissant la cavité du moule (6') le long d'axes longitudinaux (24) transversalement par rapport au plan du moule dans la zone de basse pression (62) et se terminent aux extrémités de ce dernier, relativement loin de la face (15) de l'élément définissant la cavité du moule.
PCT/US1993/011825 1992-12-11 1993-12-07 Appareil et technique de moulage par injection d'un monolithe en plastique WO1994013461A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU60485/94A AU6048594A (en) 1992-12-11 1993-12-07 Apparatus and technique for injection molding a plastic monolith

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US98912592A 1992-12-11 1992-12-11
US07/989,125 1992-12-11

Publications (1)

Publication Number Publication Date
WO1994013461A1 true WO1994013461A1 (fr) 1994-06-23

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ID=25534789

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1993/011825 WO1994013461A1 (fr) 1992-12-11 1993-12-07 Appareil et technique de moulage par injection d'un monolithe en plastique

Country Status (2)

Country Link
AU (1) AU6048594A (fr)
WO (1) WO1994013461A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19706296A1 (de) * 1996-10-31 1998-05-07 Petr Zivny Zahnbürste
WO2003059594A1 (fr) * 2002-01-17 2003-07-24 Coronet-Werke Gmbh Procédé et dispositif pour produire des poils de brosserie
US6709621B2 (en) * 1999-09-14 2004-03-23 Phillip E. Mark Bristles of an applicator produced in a laser milled mold
GB2420737A (en) * 2004-12-03 2006-06-07 William Brian Turner Manufacturing a cylindrical brush
WO2018057683A1 (fr) * 2016-09-26 2018-03-29 Colgate-Palmolive Company Instrument de soin buccal ou plaque de tête pour celui-ci et procédé de formation associé
AU2019201768B2 (en) * 2015-12-14 2020-06-11 Colgate-Palmolive Company Oral care implement

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2621369A (en) * 1948-02-13 1952-12-16 Empire Brush Works Inc Method of making hairbrushes
US3781402A (en) * 1970-11-12 1973-12-25 P Hanggi Process for the production of brushes or a part thereof including the bristles
US4107259A (en) * 1974-12-09 1978-08-15 Brunswick Corporation Method of making a cross linked pile product
US4230657A (en) * 1979-04-30 1980-10-28 Keene Corporation Method and apparatus for producing artificial greenery
US4257755A (en) * 1974-06-25 1981-03-24 Lemelson Jerome H Molding system and method
US4422986A (en) * 1981-09-23 1983-12-27 Cole William E Method and apparatus for infection molding brushes
US4712936A (en) * 1981-06-26 1987-12-15 Milton Kessler One-piece cap and brush and method of forming it
US5162092A (en) * 1990-11-29 1992-11-10 Cascade Engineering, Inc. Gas-assisted injection molding with a carpet layer

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2621369A (en) * 1948-02-13 1952-12-16 Empire Brush Works Inc Method of making hairbrushes
US3781402A (en) * 1970-11-12 1973-12-25 P Hanggi Process for the production of brushes or a part thereof including the bristles
US4257755A (en) * 1974-06-25 1981-03-24 Lemelson Jerome H Molding system and method
US4107259A (en) * 1974-12-09 1978-08-15 Brunswick Corporation Method of making a cross linked pile product
US4230657A (en) * 1979-04-30 1980-10-28 Keene Corporation Method and apparatus for producing artificial greenery
US4712936A (en) * 1981-06-26 1987-12-15 Milton Kessler One-piece cap and brush and method of forming it
US4422986A (en) * 1981-09-23 1983-12-27 Cole William E Method and apparatus for infection molding brushes
US5162092A (en) * 1990-11-29 1992-11-10 Cascade Engineering, Inc. Gas-assisted injection molding with a carpet layer

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19706296A1 (de) * 1996-10-31 1998-05-07 Petr Zivny Zahnbürste
US6709621B2 (en) * 1999-09-14 2004-03-23 Phillip E. Mark Bristles of an applicator produced in a laser milled mold
WO2003059594A1 (fr) * 2002-01-17 2003-07-24 Coronet-Werke Gmbh Procédé et dispositif pour produire des poils de brosserie
US7294297B2 (en) 2002-01-17 2007-11-13 Geka Brush Gmbh Method and device of the production of brushes
CN100423926C (zh) * 2002-01-17 2008-10-08 歌卡刷子有限公司 制造刷毛的方法和装置
GB2420737A (en) * 2004-12-03 2006-06-07 William Brian Turner Manufacturing a cylindrical brush
AU2019201768B2 (en) * 2015-12-14 2020-06-11 Colgate-Palmolive Company Oral care implement
US10849417B2 (en) 2015-12-14 2020-12-01 Colgate-Palmolive Company Oral care implement
WO2018057683A1 (fr) * 2016-09-26 2018-03-29 Colgate-Palmolive Company Instrument de soin buccal ou plaque de tête pour celui-ci et procédé de formation associé
US10500773B2 (en) 2016-09-26 2019-12-10 Colgate-Palmolive Company Oral care implement or head plate therefor and method of forming the same
AU2017330320B2 (en) * 2016-09-26 2019-11-21 Colgate-Palmolive Company Oral care implement or head plate therefor and method of forming the same
CN109788840A (zh) * 2016-09-26 2019-05-21 高露洁-棕榄公司 口腔护理器具或其头板以及形成口腔护理器具或其头板的方法
US11161287B2 (en) 2016-09-26 2021-11-02 Colgate-Palmolive Company Oral care implement or head plate therefor and method of forming the same

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Publication number Publication date
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