US20090317648A1 - Apparatus and Method for Producing Resin Product - Google Patents

Apparatus and Method for Producing Resin Product Download PDF

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Publication number
US20090317648A1
US20090317648A1 US12/336,397 US33639708A US2009317648A1 US 20090317648 A1 US20090317648 A1 US 20090317648A1 US 33639708 A US33639708 A US 33639708A US 2009317648 A1 US2009317648 A1 US 2009317648A1
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United States
Prior art keywords
resin
resin layer
cavity
mold side
recess
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.)
Abandoned
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US12/336,397
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English (en)
Inventor
Byung Seok Kong
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.)
Hyundai Motor Co
Kia Corp
Original Assignee
Hyundai Motor Co
Kia Motors Corp
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Filing date
Publication date
Application filed by Hyundai Motor Co, Kia Motors Corp filed Critical Hyundai Motor Co
Assigned to HYUNDAI MOTOR COMPANY, KIA MOTORS CORP. reassignment HYUNDAI MOTOR COMPANY ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KONG, BYUNG SEOK
Priority to US12/635,586 priority Critical patent/US8017049B2/en
Publication of US20090317648A1 publication Critical patent/US20090317648A1/en
Abandoned legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
    • B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
    • B60R21/20—Arrangements for storing inflatable members in their non-use or deflated condition; Arrangement or mounting of air bag modules or components
    • B60R21/215—Arrangements for storing inflatable members in their non-use or deflated condition; Arrangement or mounting of air bag modules or components characterised by the covers for the inflatable member
    • 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
    • B29C45/16—Making multilayered or multicoloured 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
    • B29C39/00—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
    • B29C39/02—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor for making articles of definite length, i.e. discrete articles
    • B29C39/12—Making multilayered or multicoloured 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
    • B29C45/16—Making multilayered or multicoloured articles
    • B29C45/1635—Making multilayered or multicoloured articles using displaceable mould parts, e.g. retractable partition between adjacent mould cavities
    • 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
    • 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
    • B29C45/76—Measuring, controlling or regulating
    • 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
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76003—Measured parameter
    • B29C2945/76006—Pressure
    • 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
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76177—Location of measurement
    • B29C2945/76254—Mould
    • B29C2945/76257—Mould cavity
    • 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
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76177—Location of measurement
    • B29C2945/7629—Moulded 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
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76344—Phase or stage of measurement
    • B29C2945/76391—Mould clamping, compression of the cavity
    • 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
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76494—Controlled parameter
    • B29C2945/76498—Pressure
    • 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
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76822—Phase or stage of control
    • B29C2945/76859—Injection
    • 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
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76929—Controlling method
    • B29C2945/76936—The operating conditions are corrected in the next phase or cycle
    • 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
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76929—Controlling method
    • B29C2945/76939—Using stored or historical data sets
    • B29C2945/76946—Using stored or historical data sets using an expert system, i.e. the system possesses a database in which human experience is stored, e.g. to help interfering the possible cause of a fault
    • 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
    • B29L2031/30—Vehicles, e.g. ships or aircraft, or body parts thereof
    • B29L2031/3005—Body finishings
    • B29L2031/3008—Instrument panels
    • 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
    • B29L2031/30—Vehicles, e.g. ships or aircraft, or body parts thereof
    • B29L2031/3005—Body finishings
    • B29L2031/3041—Trim panels
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31855—Of addition polymer from unsaturated monomers
    • Y10T428/31909—Next to second addition polymer from unsaturated monomers

Definitions

  • the present invention relates to an apparatus and a method for producing a resin product which includes an inner layer and an outer layer, and, more particularly, to an apparatus and a method for producing a resin product in which part of an inner layer (a first resin layer) is covered with an outer layer (a second resin layer) so that a boundary line between the inner layer and the outer layer is visible from the outside.
  • an outer layer which has a material (in particular, a soft material unlike that of the crash pad) and a color, different from that of the crash pad 1 , is formed on a door region 2 of a passenger air bag (“PAB”) so as to give off a feeling of sophistication.
  • PAB passenger air bag
  • such a conventional crash pad has been generally manufactured in a manner in which an outer component, which is separately produced in advance, is attached to the crash pad 1 .
  • an outer component which is separately produced in advance
  • a recent technical development is to realize a PAB door region 2 which is integrally covered with an outer layer of material different from that of the PAB door at the time of the injection molding process of a crash pad.
  • the latter method is relatively advantageous in that it is excellent in terms of cost and the appearance of a fabricated crash pad, in particular, the boundary line of the PAB door region 2 is clean-cut and clearly demarcated.
  • An apparatus for producing the crash pad comprises a mold, and a first resin supply unit 10 and a second resin supply unit 20 for supplying resin material into an internal space in a mold.
  • the mold comprises a first mold side having a recess 30 , a second mold side, and a slide core movably fitted in the recess 30 of the first mold side.
  • PPF resin Polypropylene Filled Resin
  • talc-filled polypropylene resin is used as a first resin material
  • flexible TPO resin Thermoplastic Olefin Resin
  • the process of producing the crash pad is conducted in a manner that the slide core is moved to the extracted position to define a first cavity 11 ( FIG. 3A ), the first resin is supplied into the first cavity 11 to form a first resin layer 1 a ( FIG. 3B ), the slide core is moved to the retracted position to define a second cavity 21 ( FIG. 3C ), and prior to the solidification of the first resin, second resin is supplied into the second cavity 21 to form a second resin layer 2 a on the first resin layer 1 a ( FIG. 3D ).
  • the resulting crash pad which is produced in this manner, has a considerably well delimited boundary line B between the first and second resin layers 1 a and 2 a ( FIG. 3E ).
  • the rear surface of the resulting crash pad is post-processed to produce a tear line L, and is attached to a chute 3 of an airbag module in a fusion manner.
  • the chute 3 is assembled with a housing 4 which accommodates a folded cushion 5 .
  • the present invention has been made keeping in mind the above problems occurring in the related art, and the present invention provides an apparatus and a method for producing a resin product in which a first resin layer is partially covered with a second resin layer and which has a very fine appearance at a tear line and obviates post-processing for the formation of the tear line.
  • the apparatus may include a first mold side having a recess, a second mold side configured and dimensioned to enclose the recess of the first mold side, a slide core movably fitted in the recess of the first mold side, which may be movable toward the second mold side to an extracted position to define a first cavity, and may be movable rearward to a retracted position after a first resin is injected into the first cavity to form the first resin layer, thus defining a second cavity into which a second resin is injected to form the second resin layer, the slide core including a dam dimensioned and configured to form a groove in the first resin layer during the formation of the first resin layer, wherein the dame partially positioned in the groove during the formation of the second resin layer, a first resin supply unit for supplying the first cavity with the
  • the recess may be a stepped structure including a first recess section and a second recess section having a greater depth than that of the first recess section, and the slide core may be positioned in the second recess section.
  • the dam may be formed along a circumference of the slide core.
  • the second mold side may include a wedge ridge for forming a tear line in the first resin layer.
  • the slide core may include a pressure sensor for measuring a pressure of resin in a vicinity of the wedge ridge.
  • Another aspect of the present invention is directed to a method of producing a resin product which may include a first resin layer partially covered with a second resin layer so that a boundary line between the first and second resin layers is visible from the outside.
  • the method may include closing a first mold side having a recess with a second mold side, moving a slide core fitted in the recess of the first mold side toward the second mold side to an extracted position to define a first cavity, the slide core including a dam to form a groove in the first resin layer, filling the first cavity with a first resin to form the first resin layer, moving the slide core to a retracted position, thus defining a second cavity while the dam may be partially disposed in the groove of the first resin layer, and/or filling the second cavity with a second resin to form the second resin layer.
  • the recess may be a stepped structure including a first recess section and a second recess section having a greater depth than the first recess section, and the slide core may be positioned in the second recess section, the method further comprising filling the first cavity with the first resin such that when the first cavity may be fully filled with the first resin, a region of the first resin layer corresponding to the second recess section has a thickness less than that of a remaining region of the first resin layer.
  • the second mold side may include a wedge ridge forming a tear line in the first resin layer.
  • the method may further include measuring a pressure of the second resin in a vicinity of the wedge ridge while filling the second cavity with the second resin, and controlling an injection pressure of the second resin so as to maintain the pressure of the second resin within a predetermined range.
  • Another aspect of the present invention is directed to a method of producing a resin product which includes a first resin layer partially covered with a second resin layer so that a boundary line between the first and second resin layers is visible from the outside.
  • the method may include closing a first mold side having a recess with a second mold side, the second mold side including a wedge ridge for forming a tear line in the first resin layer, moving a slide core fitted in the recess of the first mold side toward the second mold side to an extracted position to define a first cavity, filling the first cavity with a first resin to form the first resin layer, moving the slide core to a retracted position to define a second cavity, and/or filling the second cavity with a second resin to form the second resin layer and measuring a pressure of the second resin in a vicinity of the wedge ridge, and controlling pressure of injection of the second resin so as to maintain the pressure of the second resin within a predetermined range.
  • the groove in the first resin layer has a thickness ranging from about 1 mm to about 2 mm.
  • the groove in the first resin layer have a thickness ranging from about 1 mm to about 1.5 mm.
  • the dam extends toward the second mold side along an outer circumference of the slide core with a predetermined height.
  • the second mold side may include a wedge ridge, extending along on an upper surface thereof within the dam and toward the slide core, for forming a tear line in the first resin layer.
  • the height of the wedge ridge may be smaller than thickness of the first resin layer.
  • the above-mentioned resin products may be a vehicle dashboard.
  • FIG. 1 is a perspective view showing a conventional crash pad.
  • FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1 ,
  • FIGS. 3A to 3E are cross-sectional views sequentially illustrating a conventional process of producing a crash pad.
  • FIG. 4 is a cross-sectional view showing problems occurring at the boundary between first and second resin layers during a process of forming the second resin layer shown in FIG. 3D .
  • FIG. 5 is a cross-sectional view showing a tear line, which is formed in the crash pad produced through the process shown in FIG. 3A to 3E , using post-processing.
  • FIGS. 6A to 6E are cross-sectional views sequentially illustrating an exemplary process of producing a crash pad, according to an aspect of the present invention.
  • FIG. 7 is a cross-sectional view showing a cleanly demarcated boundary of the second resin layer formed by an exemplary process of forming the second resin layer shown in FIG. 6D .
  • FIG. 8 is a graph showing an exemplary process of preventing formation of a protrusion on the second resin layer from being caused by a wedge ridge being formed on a first resin layer during the formation of the second resin layer.
  • the apparatus includes a mold, and a first resin supply unit 10 and a second resin supply unit 20 , and the mold includes a first mold part or side 100 , a second mold part or side 200 , and a slide core 300 .
  • the first mold side 100 has a recess, which is configured into a stepped structure including a first recess section 31 and a second recess section 32 having a depth deeper than the first recess section 31 .
  • the first recess section 31 may be formed only at one side of the second recess section 32 , as shown in FIGS. 6A to 6D , or may be formed at both right and left sides of the second recess section 32 .
  • the outer layer that is the second resin layer, will have a shape isolated from the outside by the inner layer, that is, the first resin layer, like a fried egg.
  • the second mold side 200 is coupled with the first mold side 100 so as to form an enclosed space defined by the first recess section 31 and the second recess section 32 .
  • the upper surface of the second mold side 200 which faces the second recess section 32 of the first mold side 100 , may be provided with a wedge ridge 50 .
  • the wedge ridge 50 is intended to form a tear line on the rear surface of the crash pad.
  • the slide core 300 is movably fitted in the second recess section 32 .
  • a first cavity 11 is defined between the first and second mold sides 100 and 200 ( FIG. 6A ).
  • a second cavity 21 is defined therebetween ( FIG. 6C ).
  • the slide core 300 movably inserted into in the second recess section 32 of the first mold side 100 is provided at the front surface thereof (the surface facing the second mold side 200 ) with a dam 40 and a pressure sensor 60 .
  • the dam 40 protrudes along the outer circumference of the front surface of the slide core 300 , and the pressure sensor 60 is incorporated at the area corresponding to the wedge ridge 50 formed on upper surface of the second mold side 200 .
  • the first resin supply unit 10 is configured to supply the first cavity 11 with a first resin, for example, PPF resin
  • the second resin supply unit 20 is configured to supply the second cavity 21 with a second resin, for example, TPO resin.
  • a control unit which will be described later.
  • FIGS. 6A to 8 the method of producing a crash pad, according to various aspects of the present invention is described.
  • the first and second mold sides 100 and 200 are coupled together, and the slide core 300 is moved in the recess section of the first mold side 100 , thus defining the first cavity 11 ( FIG. 6A ) and the second cavity 21 ( FIG. 6C ).
  • the first cavity 11 is a space to form the first resin layer 10 a
  • the second cavity 21 is a space to form the second resin layer 20 a in which the moving distance of the slide core 300 is controlled such that the thickness of the second cavity is less than that of the first cavity.
  • the first cavity 11 When the first resin is injected into the first cavity 11 ( FIG. 6B ), the first cavity 11 is fully filled with the first resin, thus forming the first resin layer 10 a in which a resin layer formed in the second cavity section 20 a has a thickness less than that of a resin layer formed in the first cavity.
  • the first resin layer 10 a is formed with a groove 10 b ( FIG. 6E ) made by the dam 40 of the slide core 300 .
  • the groove 10 b may have a thickness ranging from 1 mm to 2 mm, and preferably a thickness ranging from 1 mm to 1.5 mm.
  • the first resin layer 10 a is provided with a valley groove (L) at a region corresponding to the wedge ridge 50 . In this regard, when the first resin is injected, a pressure of the first resin is locally increased at the region corresponding to the wedge ridge 50 .
  • the locally increased pressure of the first resin causes the formation of a protrusion 10 c ( FIG. 6E ) at the region corresponding to the wedge ridge 50 .
  • the slide core 300 Prior to the solidification of the first resin, the slide core 300 is retracted toward the first mold side 100 to define the second cavity 21 ( FIG. 6C ). At this time, the dam 40 of the slide core 300 partially remains disposed in the groove 10 b ( FIG. 7 ).
  • the second resin is injected into the second cavity 21 , the second resin is blocked by the dam 40 and thus cannot leak into the first resin layer 10 a. Even if a portion of the second resin leaks, the leaked portion of the second resin does not infiltrate between the first mold side 100 and the first resin layer 10 a but instead is trapped in the groove 10 b as shown in FIG. 7 .
  • the second resin in the groove 10 b is almost invisible. Consequently, the boundary region between the first resin layer 10 a and the second resin layer 20 a has a remarkably clean appearance.
  • the protrusion 10 c of the first resin layer 10 a which is formed along the tear line, may also cause the formation of a protrusion on the second resin layer 20 a during the injection of the second resin.
  • the reason for this has been mentioned above. Accordingly, in order to prevent this formation of a protrusion on the second resin layer 20 a , it is necessary to control the pressure of the second resin in the vicinity of the protrusion 10 c. More specifically, as shown in FIGS.
  • the pressure of the second resin at the protrusion 10 c is measured using the pressure sensor 60 , and then the injection pressure control unit controls an injection pressure of the second resin supplied from the second resin supply unit 20 , depending on the measured pressure value, such that the pressure of the second resin at the protrusion is maintained within a predetermined range.
  • the pressure of the second resin measured by the pressure sensor is represented as curve 1
  • the present injection pressure of the second resin may be maintained as it is.
  • the pressure of the second resin is represented as curve 2
  • the injection pressure of the second resin needs to be decreased.
  • the pressure of the second resin is represented as curve 3
  • the injection pressure of the second resin needs to be increased.
  • the appropriate range of the injection pressure of the second resin may be acquired through repeated experiments.
  • the height of the protrusion 10 c may be properly controlled by controlling the pressure of the first resin at the wedge ridge 50 during the injection of the first resin.
  • the present invention provides an apparatus and a method for producing a resin product having an excellent appearance, and obviates post-processing formation of a tear line.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
US12/336,397 2008-06-20 2008-12-16 Apparatus and Method for Producing Resin Product Abandoned US20090317648A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US12/635,586 US8017049B2 (en) 2008-06-20 2009-12-10 Apparatus and method for producing resin product

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KR10-2008-0058293 2008-06-20
KR1020080058293A KR100968823B1 (ko) 2008-06-20 2008-06-20 수지 제품 제조장치 및 방법

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US12/635,586 Active US8017049B2 (en) 2008-06-20 2009-12-10 Apparatus and method for producing resin product

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KR (1) KR100968823B1 (ko)
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Cited By (4)

* Cited by examiner, † Cited by third party
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US20140145731A1 (en) * 2010-07-30 2014-05-29 Continental Automotive Gmbh Method For Producing A Capacitive Contact Sensor And Capacitive Contact Sensor
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CN101607431B (zh) 2016-02-10
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DE102008059222B4 (de) 2018-07-26
US20100090367A1 (en) 2010-04-15
US8017049B2 (en) 2011-09-13
KR100968823B1 (ko) 2010-07-08

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