CA2663872A1 - Manifold system having flow control - Google Patents

Manifold system having flow control Download PDF

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Publication number
CA2663872A1
CA2663872A1 CA002663872A CA2663872A CA2663872A1 CA 2663872 A1 CA2663872 A1 CA 2663872A1 CA 002663872 A CA002663872 A CA 002663872A CA 2663872 A CA2663872 A CA 2663872A CA 2663872 A1 CA2663872 A1 CA 2663872A1
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CA
Canada
Prior art keywords
valve pin
gate
molding apparatus
injection molding
flow rate
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.)
Granted
Application number
CA002663872A
Other languages
French (fr)
Other versions
CA2663872C (en
Inventor
David Kazmer
Mark D. Moss
Mark Doyle
Huip Van Geel
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.)
Synventive Molding Solutions Inc
Original Assignee
Individual
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Filing date
Publication date
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Publication of CA2663872A1 publication Critical patent/CA2663872A1/en
Application granted granted Critical
Publication of CA2663872C publication Critical patent/CA2663872C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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    • 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
    • B29C45/77—Measuring, controlling or regulating of velocity or pressure of moulding material
    • 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
    • B29C45/27—Sprue channels ; Runner channels or runner nozzles
    • B29C45/2701—Details not specific to hot or cold runner channels
    • 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
    • B29C45/27—Sprue channels ; Runner channels or runner nozzles
    • B29C45/28—Closure devices therefor
    • B29C45/2806—Closure devices therefor consisting of needle valve systems
    • 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
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    • B29C45/30—Flow control means disposed within the sprue channel, e.g. "torpedo" construction
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    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C45/2806—Closure devices therefor consisting of needle valve systems
    • B29C2045/2882—Closure devices therefor consisting of needle valve systems closing by a movement in the counterflow direction
    • 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
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    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • 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
    • B29C45/82—Hydraulic or pneumatic circuits

Abstract

An injection molding apparatus and method are provided in which the rate of material flow during an injection cycle is controlled. According to one preferred embodiment, an injection molding apparatus is provided that includes a manifold (231), at least one injection nozzle (215) coupled to the manifold, an actuator, and a valve pin (200) adapted to reciprocate through the manifold and the injection nozzle.
The valve pin (200) has a first end coupled to the actuator, a second end that closes the gate (211) in a forward position, and a control surface (205) intermediate said first and second ends for adjusting the rate of material flow during an injection cycle. Retracting the valve pin tends to decrease the rate of material flow during the injection cycle and displacing the valve pin toward the gate (211) tends to increase the rate of material flow during the injection cycle.

Claims (9)

1. An injection molding apparatus comprising:
a manifold to direct material into a mold cavity;

a valve pin adapted to reciprocate through the manifold toward and away from the mold cavity, wherein valve pin contacts material injected into the mold cavity; and a controller to control a flow rate of material injected into the first cavity during an injection cycle based on a force exerted on the valve pin by the material.
2. The injection molding apparatus of claim 1, wherein adjusting a position of the valve pin changes the flow rate, and the controller adjusts the position of the valve pin to control the flow rate.
3. The injection molding apparatus of claim 2, wherein the controller adjusts the position of the valve pin according to a target profile, wherein the target profile represents target values of the force of the material exerted on the valve pin.
4. The injection molding apparatus of claim 1, further- comprising a load cell mounted to a rearward end of the valve pin to sense the force exerted on the valve pin by the material.
5. The injection molding apparatus of claim 1, further comprising an actuator to which the valve pin is coupled, the actuator including first and second chambers, and first and second pressure transducers coupled to the first and second chambers, respectively, the first and second pressure transducers to sense the force exerted on the valve pin by the material.
6. The injection molding apparatus of claim 5, wherein adjusting a position of the valve pin changes the flow rate, and the controller adjusts the position of the valve pin to control the flow rate according to a differential pressure sensed by the first and second pressure transducers.
7. The injection molding apparatus of claim 6, wherein the controller adjusts the position of the valve pin according to a target profile, wherein the target profile represents target values of the differential pressure.
8. The injection molding apparatus of claim 1, wherein the valve pin closes the gate.
9. The injection molding apparatus of claim 1, wherein the manifold injects material through a plurality of gates, each gate having a valve pin associated therewith to independently control a rate at which material flows through each gate during an injection cycle, wherein adjusting a position of each valve pin changes the rate for each gate, the controller controlling the position of each valve pin during an injection cycle according to individualized target profiles associated with each gate, wlierein each target profile represents target values of a sensed condition for each gate related to the flow rate of material injected through each gate during the injection cycle, the sensed condition for each gate being force exerted on the valve pin for that gate by the material.
CA2663872A 1999-09-21 2000-09-21 Manifold system having flow control Expired - Fee Related CA2663872C (en)

Applications Claiming Priority (3)

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US09/400,533 US6464909B1 (en) 1998-04-21 1999-09-21 Manifold system having flow control
US09/400,533 1999-09-21
CA002385016A CA2385016C (en) 1999-09-21 2000-09-21 Manifold system having flow control

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CA2663872C CA2663872C (en) 2011-07-05

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EP (4) EP1537971A3 (en)
KR (1) KR20010113653A (en)
CN (2) CN100406232C (en)
AT (1) ATE295257T1 (en)
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CA (2) CA2385016C (en)
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