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WO1992002352A1 - Injection-compression-molding method - Google Patents

Injection-compression-molding method Download PDF

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Publication number
WO1992002352A1
WO1992002352A1 PCT/JP1991/000978 JP9100978W WO9202352A1 WO 1992002352 A1 WO1992002352 A1 WO 1992002352A1 JP 9100978 W JP9100978 W JP 9100978W WO 9202352 A1 WO9202352 A1 WO 9202352A1
Authority
WO
WIPO (PCT)
Prior art keywords
cavity
injection
compression
volume
synthetic resin
Prior art date
Application number
PCT/JP1991/000978
Other languages
English (en)
French (fr)
Inventor
Akira Yokota
Original Assignee
Komatsu, Ltd.
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 Komatsu, Ltd. filed Critical Komatsu, Ltd.
Priority to KR1019920700714A priority Critical patent/KR920702280A/ko
Publication of WO1992002352A1 publication Critical patent/WO1992002352A1/ja

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Classifications

    • 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
    • B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
    • B29C45/56—Means for plasticising or homogenising the moulding material or forcing it into the mould using mould parts movable during or after injection, e.g. injection-compression moulding
    • B29C45/561—Injection-compression moulding
    • 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
    • B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
    • B29C45/56—Means for plasticising or homogenising the moulding material or forcing it into the mould using mould parts movable during or after injection, e.g. injection-compression moulding
    • 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
    • B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
    • B29C45/56—Means for plasticising or homogenising the moulding material or forcing it into the mould using mould parts movable during or after injection, e.g. injection-compression moulding
    • B29C45/561—Injection-compression moulding
    • B29C2045/563—Enlarging the mould cavity during injection
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/04—Polymers of ethylene
    • B29K2023/06—PE, i.e. polyethylene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/04—Polymers of ethylene
    • B29K2023/06—PE, i.e. polyethylene
    • B29K2023/0658—PE, i.e. polyethylene characterised by its molecular weight
    • B29K2023/0683—UHMWPE, i.e. ultra high molecular weight polyethylene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/10—Polymers of propylene
    • B29K2023/12—PP, i.e. polypropylene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2077/00—Use of PA, i.e. polyamides, e.g. polyesteramides or derivatives thereof, as moulding material

Definitions

  • the present invention relates to an injection compression molding method, and more particularly to an injection compression method which is optimally applied to a thermoplastic resin having a high melt viscosity and a low fluidity.
  • the injection molding method enables molding with high dimensional accuracy, and among various injection molding materials, for example, ultra-high molecular weight polyethylene, fluorine resin, etc. have excellent impact resistance, wear resistance, self-lubrication, chemical resistance, etc. Therefore, it is being widely used for various machine parts and household goods.
  • these thermoplastic synthetic resins have high melt viscosities and extremely low fluidity, so that molding by ordinary injection molding methods is difficult.
  • Various molding methods have been proposed for injection molding thermoplastic resins with high melt viscosities. The following two injection molding methods are examples.
  • the first method is an injection molding method for ultra-high molecular weight polyethylene disclosed in Japanese Patent Publication No. 30G67 No. 30G 1982 (1982).
  • the cavity volume is set to 1.5 to 3.0 times the volume of the injected resin, and then the melt-plasticized ultra-high molecular weight polyethylene is sheared at the injection port at a shear rate of 50,000 se 1.
  • the cavity volume is reduced to a volume not more than 2.0 times the injection resin amount and smaller than the initial capacity of the cavity after the injection charging is completed. It compresses ultra-high molecular weight polyethylene inside the cavity.
  • the second method is an injection compression method for ultra-high molecular weight polyethylene, fluororesin, etc., disclosed in Japanese Patent Publication No.
  • the cavity volume is set to the same volume as the molded product volume, and then the melt-plasticized resin is injected and filled into the cavity through a part of the runner at a shearing rate at which it becomes a powder.
  • the mold is inserted at any time from immediately before injection charging to the point where there is a pressure difference between a part of the runner and the cavity after the end of injection and the material resin in the runner does not solidify.
  • the second method involves a very complicated process for introducing the melt-plasticized thermoplastic resin into the cavity in a powder state.
  • the injection pressure into the cavities is not high enough, the filling of individual cavities cannot be balanced, and the weight of the molded product for each cavity is reduced.
  • the problem of variation Furthermore, in order to inject and charge the material resin into the cavity in a powder state, it is necessary to inject at a low shear rate until the injection filling is completed.
  • the filling pressure gradually increases as the material resin is filled.
  • the filling speed is reduced, and the material resin to be injected is changed from a powder state to a nodule state. If the material resin is injected and filled into the cavity in this nodule state, a shear stress remains between the molecules of the material resin and molecular orientation occurs.
  • the molecular orientation is the phase of the linear expansion coefficient between the orientation direction and its perpendicular direction. Due to the difference, residual stress is generated after injection molding, causing shrinkage and stress distortion, resulting in caging (net-like cracks), cracking (cracks), and layer separation.
  • the second method when the cavity is expanded, there is a pressure difference between a part of the runner and the cavity immediately after the end of the injection charging and after the end of the injection charging and the runner is increased.
  • An arbitrary point in time until the material resin of the part does not solidify must be determined.
  • the time immediately before the end of injection charging can be easily determined from the injection time.
  • the time when the material resin is not solidified in the resin flow path is the melting point temperature, injection temperature, mold temperature, and cavity volume of the material resin. It also depends on molding conditions such as injection time. Even if these molding conditions are kept constant, it is impossible to observe the phenomena inside the mold from the outside.Therefore, experiments were repeated with different times until the cavity was expanded after the end of injection charging. It is necessary to determine when to expand the cavity by opening the mold and observing the condition of the resin inside the cavity. In addition, the expansion of the cavities must be performed each time the material resin used and the molding conditions are changed, which is extremely time-consuming.
  • An object of the present invention is to provide an injection compression molding method which is excellent in workability and which does not cause shrinkage or stress distortion due to molecular orientation in resin, with the object of solving the above-mentioned problems. What you are trying to provide o
  • the injection compression molding method according to the present invention basically comprises:
  • the resin's pressure of the filled plasticized synthetic resin recovers at least. It is preferable to perform injection filling until the pressure rises to generate a stress, and it is preferable to reduce the injection pressure immediately after injection filling the plasticized synthetic resin into the cavity. It is preferable to set restrictions on the amount of expansion of the cavity volume due to '
  • the decrease or increase in the pressing force applied from behind the movable mold is controlled by the movement of the plate, which is a compression engaged with a compression cylinder driven by supplying and discharging hydraulic oil.
  • the supply and discharge of pressure oil to and from the compression cylinder are provided on a pressure oil line between the compression cylinder and the pressure oil source, and between the electromagnetic switching valve and the compression cylinder installed on the pressure oil line. It is preferably controlled by a relief valve and a check valve or a pilot check valve arranged in parallel.
  • the capillaries are added from behind to reduce the capacities.
  • the volume of the cavity is expanded due to the elastic recovery stress of the plasticized synthetic resin compressed and filled inside the cavity.
  • the plasticizing compound created during the injection process The molecular orientation of the resin is disturbed, and even if the cavity volume is contracted again, the molecular orientation remains in the disturbed state, so the molded product is creased by residual stress caused by the molecular orientation. Does not cause cracking, layered separation, etc.
  • the elastic recovery stress for disturbing the molecular orientation is satisfied by injecting a plasticizable synthetic resin into the cavity and filling the plasticized synthetic resin until the resin pressure inside the cavity is sufficiently increased. Is done.
  • the injection pressure is reduced immediately after injection of the plasticized synthetic resin into the cavity to prevent excess plasticized synthetic resin from flowing into the cavity through the gate when the volume of the cavity is expanded.
  • a molded article having a predetermined weight can be obtained.
  • the amount of expansion of the cavity volume due to the elastic recovery stress of the compressed plasticized synthetic resin is regulated by the stopper provided in the movable mold, so that the interior of the cavity is the cavity. Negative pressure due to inertia of components does not occur, and no void is generated.
  • An example of a control means for controlling a decrease or an increase in the pressing force applied from behind the movable mold is a compression press engaged with a compression cylinder driven by supplying and discharging pressurized oil. There is one movement.
  • the supply and discharge of pressure oil to and from the compression cylinder are provided on a pressure oil line between the compression cylinder and the pressure oil source, and between an electromagnetic switching valve installed on the pressure oil line and the compression cylinder. Since it is controlled by a relief valve and a check valve or a pilot check valve which are arranged in parallel, the mold side and the injection molding machine side are connected as in the injection compression molding method of the present invention. If they are not driven at the same time, one pressure oil source can be used for both the mold side and the injection molding machine side, and the hydraulic circuit can be simplified.
  • FIG. 1 to 9 are drawings for explaining a preferred embodiment of the injection compression molding method according to the present invention.
  • FIG. 1 is a semi-illustrated vertical cross-sectional view of the entire injection molding apparatus
  • FIG. 2 is an enlarged vertical sectional view of a main part of FIG. 1,
  • Fig. 3 is a sequence diagram illustrating the molding process
  • FIG. 4 is a half-schematic vertical cross-sectional view of the entire injection molding apparatus having different hydraulic circuits
  • Fig. 5 is a sequence diagram illustrating the molding process.
  • Fig. 6 is a semi-illustrated vertical cross-sectional view of the entire injection molding apparatus with different hydraulic circuits
  • Fig. 7 is a sequence diagram explaining the molding process
  • FIG. 8 is a sequence diagram illustrating the molding process
  • FIG. 9 is a sequence diagram illustrating a molding step. BEST MODE FOR CARRYING OUT THE INVENTION
  • the material resin used in each example is ultra-high molecular weight polyethylene, which has a much higher molecular weight than ordinary polyethylene, and has extremely high melt viscosity among the synthetic resins used for injection molding. It is known as a synthetic resin that is more difficult to mold than a resin.
  • ultra-high molecular weight polyethylene is obtained, for example, by cider polymerization and has an intrinsic viscosity [] in decalin of 135 or more, especially 10 i3 ā‡ 4 / g or more, and a melt index (ASTMD 1238 FMI 120 ) Is polyethylene of 0.01 g / 10 min or less.
  • TM / g As an example of such an ultra-high molecular weight polyethylene, in each embodiment, Kusumirion 340M (Mitsui Petrochemical Co., Ltd., Meltoindex 0.01 g / 10 min or less, intrinsic viscosity [7?] 16. TM / g) was used.
  • the injection temperature is not particularly limited as long as it is higher than the melting point of the ultra-high molecular weight polyethylene and lower than the decomposition temperature, but is generally 150 to 300, more preferably 170 to 240 t. Set.
  • FIG. 1 shows an outline of an entire injection molding machine and an injection molding apparatus 1 including a hydraulic circuit
  • a mold 10 for molding an injection molded article, and an injection molding machine 11 in a nozzle section 12 are shown.
  • a mold 10 for molding an injection molded article, and an injection molding machine 11 in a nozzle section 12 are shown.
  • the molten plasticized material resin is measured and the nozzle portion is measured.
  • the cavity 15 of the mold 10 is injected and filled through the flow path 15 formed in the mold 12 and the runner section 16 and the gate section 17 of the mold 10 (see FIG. 2).
  • Screen 19 is installed.
  • the screw 19 is rotated by a screw rotation motor 20 for melting and kneading the material and resin pellets of the screw 19.
  • the screw 19 and the screw rotation motor 20 are mounted on a base 21, and the base 21 controls a flow control valve 22 and an electromagnetic relief valve 23 by a control device 24.
  • the pressure oil is supplied to and discharged from the hydraulic oil device 27 via the line 26 from the pressure oil source 25, and is driven left and right in the figure.
  • the metering of the plasticized synthetic resin to be injected and the injection of the metered plasticized synthetic resin into the cavity 18 of the mold 10 are performed before the nozzle portion 12 of the screw 19 for filling.
  • a predetermined pressing force is applied to the screw 19 for moving the plasticized synthetic resin inside the cylinder 13 to a predetermined pressure, etc. by supplying and discharging hydraulic oil to and from the hydraulic screw device 27. Done through the infrastructure 21.
  • the forward / backward movement of the screen 19 is based on the stroke set value set in the stroke setting unit 28.
  • ā‡ is controlled by the controller 24. That is, the stroke setting value is compared with the position value of the screw 19 measured by the screw position detector 29 engaged on the base 21 in the comparator 30, and the stroke value is compared with the stroke setting value.
  • a signal indicating the comparison result is supplied from the comparator 30 to the control device 24 that controls the hydraulic system, and the amount of hydraulic oil supplied from the hydraulic oil source 25 to the hydraulic biston device 27 is controlled by the flow control valve 22 and the electromagnetic relief valve. 23 controls the forward / backward movement of the screw 19. It goes without saying that the rotation or stop of the screw rotation motor 20 is also performed by a signal given from the control device 24 in connection with the forward / backward movement of the screw 19.
  • the mold 10 includes a fixed mold 31 joined to the nozzle 12 of the injection molding machine 11, an intermediate mold 32 forming the cavity 18, and a compression mold.
  • the compression volume is changed by moving the compression plate 33 forward and backward.
  • the compression plate 33 is engaged with the piston rod 35 of the compression cylinder 34, and the piston rod 35 controls the electromagnetic switching valve 36 and the electromagnetic relief valve 37 by the control device 24 to control the compression.
  • the oil is supplied from the oil source 38 to the compression cylinder via lines 39a and 39b, and is driven to the left and right in the figure.
  • the solenoid a of the solenoid-operated directional control valve 36 is excited, and the pressure oil is supplied from the pressure oil source 38 to the piston side 34a of the compression cylinder 34, so that the screw rod 35 is positioned as shown in FIG.
  • the compression plate 33 moves forward and the cavity contracts.
  • the solenoid a of the electromagnetic switching valve 34 is de-energized and the solenoid b is energized, the pressure oil supplied to the biston side 34a of the compression cylinder 34 is discharged, and the piston rod 35 is discharged.
  • the compression plate 33 is retracted and the capacity 18 is enlarged.
  • a return pin 40 is provided on the compression plate 33.
  • the return pin 40 When the return plate 40 comes into contact with the intermediate mold 32 when the compression plate 33 moves forward, the return pin 40 is provided. The forward movement of the plate 33 is restricted to secure the minimum volume of the cavity 18. ā‡ Also, a stop 41 is provided behind the compression plate 33, so that the compression plate 33 moves backward when it is retracted. When the plate 33 comes into contact with the flange 41, the compression plate 33 is restricted from retreating and the maximum volume of the cavity 18 is set.
  • the mold 10 is closed by a known means.
  • the solenoid a of the electromagnetic switching valve 36 When the solenoid a of the electromagnetic switching valve 36 is excited with the mold 10 closed, the pressure oil is supplied from the pressure oil source 38 to the piston side 34a of the compression cylinder 34 via the line 39a. Then, the piston plate 35 is driven to the right in the drawing to advance the compression plate 33, and contracts the cavity 18 to the initial volume, that is, the molded product volume or less. Confirmation that the capacity of the cavity 18 has been set to the initial volume is performed by pressing the return pin 40 against the intermediate mold 32 on the compression plate 33.
  • Pressure oil is supplied from the pressure oil source 25 to the hydraulic screw device 27 via the pipe line 26, and the screw 19 is advanced by the predetermined stroke set value set in the stroke setting device 28.
  • a predetermined amount of melt-plasticized ultra-high molecular weight polyethylene in the cylinder 13 is injected into the cavity 18 at high pressure and at high speed.
  • the elastic recovery stress of the melt plasticized ultra high molecular weight polyethylene inside the cavity 18 is sufficiently relaxed and the gate portion 17 is solidified, but the melt plasticized ultra high molecular weight polyethylene inside the cavity 18 does not solidify.
  • the degree of relaxation time is maintained with the cavity 18 expanded.
  • the solenoid a of the electromagnetic switching valve 36 is excited to supply the pressure oil set at the relief valve 37 to the piston side 34a of the compression cylinder 34.
  • the compression plate 33 moves forward by moving the inlet pad 35 to the right in the figure, and contracts the volume of the cavity 18 to a predetermined molded product volume.
  • the molded product is taken out of the mold 10 by using the compression cylinder 34 as an eject cylinder for taking out the molded product.
  • the solenoid a of the electromagnetic switching valve 36 is excited.
  • the piston rod 35 moves to the right in the drawing to advance the compression plate 33 to protrude the molded product from behind and release it from the mold 10.
  • the solenoid a of the electromagnetic switching valve 36 is de-energized and the solenoid b is energized, the piston rod 35 moves to the left in the figure, causing the compression plate 33 to retreat. To prepare for the next molding cycle.
  • the melt plasticized ultra-high molecular weight polyethylene is injected at high speed and high pressure into the cavity 18 contracted to the molded product volume or less, and the melt plasticized compressed state is filled.
  • the ultra-high molecular weight polyethylene expands the capacity of 18 cavities beyond the molded product volume by elastic recovery stress, and the molecular orientation that was disturbed during the expansion of the cavity volume remains disturbed. It is compressed to a predetermined molded product volume. Therefore, no residual stress due to molecular orientation is generated, and no caging, cracking, laminar separation, etc., occur. Furthermore, by compressing the once expanded cavity to a predetermined molded product volume after injection filling, it is possible to prevent the occurrence of sink marks in the molded product and improve the dimensional accuracy. it can.
  • the compression plate 33 was made to perform the same reciprocating operation as in the first embodiment, and the The process of forming a polyethylene having a molecular weight of polyethylene will be described.
  • the same reference numerals as those in FIG. 1 denote the same functions, and a description thereof will be omitted. In this case, a part that overlaps with the first embodiment is omitted.
  • FIG. 4 which schematically shows the entirety of the injection molding apparatus 2
  • a conduit 39 is provided from the hydraulic oil source 25 to the biston side 34 a of the compression cylinder 34, and an electromagnetic switch on the conduit 39 is provided.
  • An electromagnetic relief valve 50 and a check valve 51 are provided in parallel in a pipe 39a between the valve 36 and the piston side 34a of the compression cylinder 34, and the electromagnetic switching valve 36 and the electromagnetic relief valve are provided.
  • the piston rod 35 is controlled by the control device 24 to control the piston rod 35 with the pressure oil supplied and discharged from the pressure oil source 25 to the compression cylinder 34 through the line 39 and the line 39 a or 39 b. It is driven in the left-right direction in the figure. That is, in this embodiment, the pressurized oil is supplied and discharged from one pressurized oil source 25 to the injection cylinder 27 and the compression cylinder 34.
  • the solenoid a of the electromagnetic switching valve 36 When the mold 10 is closed, the solenoid a of the electromagnetic switching valve 36 is excited, and the set pressure value of the electromagnetic relief valve 50 is set to the maximum value in the settable range.
  • the highest pressure oil is supplied from the pressure oil source 25 to the biston side 34a of the compression cylinder 34 via the lines 39 and 39a, and the pressure oil is supplied to the piston side of the compression cylinder 34 by the action of the check valve 51.
  • 34 a the piston side 34a of the compression cylinder 34
  • the piston rod 35 also drives to the right in the figure, and the compression plate 33 moves forward, causing the cavity 18 to contract to the initial volume, that is, the molded product volume or less. .
  • the solenoid a of the electromagnetic switching valve 36 is de-energized. Even if the excitation of the solenoid a is cut off, the pressure on the piston side 34a of the compression cylinder 34 maintains the maximum value due to the action of the pressurized oil sealed in the piston side 34a of the compression cylinder 34. Then, the compression plate 33 is pressed from behind, and the cavity 18 maintains the initial volume following the previous process. In a state where the volume of the cavity 18 is contracted, the screw 19 is advanced by a predetermined stroke set value, so that a certain amount of the melt plasticized ultra-high molecular weight polyethylene in the cylinder 13 is obtained. Into the cavity 18 at high pressure and speed.
  • the solenoid a of the electromagnetic switching valve 36 is de-energized, and the set pressure value of the electromagnetic relief valve 50 is set to an arbitrary lower value A (kg / cm 2 ) from the highest value in the previous process.
  • A the pressure on the piston side 34a of the compression cylinder 34 becomes A (kg / cm 2 ), and the pressing force from behind on the compression plate 33 decreases. Accordingly, the compression plate 33 retreats leftward in the drawing due to the elastic recovery stress of the compressed melt-plasticized ultrahigh molecular weight polyethylene inside the cavity 18, and the volume of the cavity 18 is enlarged.
  • the solenoid a of the electromagnetic switching valve 36 is excited, and the set pressure value of the electromagnetic relief valve 23 is set to B (kg / cm 2 ).
  • the compression cylinder 34 The pressure on the piston side 34a becomes B (kg / ctn 2 ), and the piston rod 35 moves upward in the figure, causing the compression plate 33 to move forward and the capacity 18 of the cavity 18 to become the molded product volume. Shrink to product.
  • the set pressure value of the electromagnetic relief valve 23 can be set within the range shown by oblique lines in the drawing according to the molding conditions of the ultra-high molecular weight polyethylene.
  • the mold 10 is opened by a known means in a state where the solenoid a of the electromagnetic switching valve 36 is turned off.
  • the solenoid rod a of the electromagnetic switching valve 36 is excited to move the piston rod 35 rightward in the drawing, thereby advancing the compression plate 33 to protrude the molded product from behind and release the molded product from the mold 10. .
  • the solenoid a of the electromagnetic switching valve 36 is de-energized and the solenoid b is energized, and the set pressure value at the electromagnetic relief valve 50 is set to the lowest value, the piston rod 35 will move to the left in the figure. To move the compression plate 33 backward to prepare for the next molding cycle.
  • a conduit 39 is provided to the compression cylinder 34 on the side 34a of the piston, and a line 39a between the electromagnetic switching valve 36 on the conduit 39 and the side 34a of the compression cylinder 34 on the side of the cylinder.
  • An electromagnetic relief valve 50 and a pie port check check valve 52 are provided in parallel with each other.
  • the pilot check valve 52 is configured to receive a pilot pressure from a pipe 39 b communicating with the piston rod 35 of the compression cylinder 34.
  • the solenoid a of the electromagnetic switching valve 36 is excited, and the set pressure value of the electromagnetic relief valve 50 is set to the maximum value, and the set pressure value of the electromagnetic relief valve 23 is set to B (kg / cm 2 ), the result is compression
  • the piston side of the cylinder 34 becomes B (kg / cm 2 ), and the piston plate 35 moves to the right in the figure, so that the compression plate 33 moves forward and the capacity of the cavity 18 becomes a molded product.
  • Shrink to volume the set pressure value of the electromagnetic relief valve 23 can be set within the range shown by oblique lines in the drawing according to the molding conditions of ultra-high molecular weight polyethylene.
  • the contracted cavity 18 volume is fixed by applying the highest pressing force from behind to the cavity 18 before and during the injection, so that the volume of the contracted cavity 18 is fixed.
  • the pressing force from behind was reduced to increase the capacity of the cavity once, and the pressing force was applied again from behind the cavity 18 to compress it to the volume of the molded product.
  • the cavity volume may be increased, and after the injection is completed, a larger pressing force may be applied to compress the cavity so as to have a predetermined molded product volume.
  • the molding step by such a method is performed by the same injection molding apparatus 2, 3 as used in the second and third embodiments.
  • the molding step of molding using the following will be described in the following fourth and fifth embodiments.
  • the mold 10 is closed by a known means.
  • the solenoid a of the electromagnetic switching valve 36 is excited, and the set pressure value of the electromagnetic relief valve 50 is set to C (kg / cm 2 ). 8 is shrunk to the initial volume equivalent to the volume of the molded product.
  • the set pressure value of the electromagnetic relief valve 50 is set to C (kg / cm 2 ), and the solenoid a of the electromagnetic switching valve 36 is de-energized.
  • a predetermined amount of the melt plasticized ultra-high molecular weight polyethylene in the cylinder 13 can be cooled at high pressure and at high speed. Inject into the inside of the c c As the molten plasticized ultra-high molecular weight polyethylene fills the inside of the cabin 18, the resin pressure inside the cabin 18 increases, and this resin pressure and the pressing force from behind As a result, the compression plate 33 is pushed back and the capacity of the cavity is expanded.
  • the set pressure value of the electromagnetic relief valve 50 can be set within a range up to the upper limit C kg / cm 2 indicated by oblique lines on the drawing according to the molding conditions of ultrahigh molecular weight polyethylene.
  • the solenoid a of the electromagnetic switching valve 36 is excited.
  • the set pressure value of the electromagnetic relief valve 23 is D (kg / cm 2 )
  • the piston side of the compression cylinder 34 will be D (kg / cm 2 ) as a result, and the piston rod
  • the set pressure value of the electromagnetic relief valve 23 can be set within a range up to the upper limit D kg / cm 2 shown by oblique lines in the drawing, according to the molding conditions of the ultrahigh molecular weight polyethylene.
  • the mold 10 is opened by a known means in a state where the solenoid a of the electromagnetic switching valve 36 is turned off.
  • FIG. 6 A molding process using the same injection molding apparatus 3 (FIG. 6) as in the third embodiment will be described with reference to a molding process sequence diagram shown in FIG. (1) Mold closing step, (2) Cavity shrinking step, (3) Injection * Cavity enlarging step are the same as those in the fourth embodiment, and therefore description thereof is omitted. (4) Cooling and compression process
  • the solenoid a of the electromagnetic switching valve 36 is excited, and the set pressure value of the electromagnetic relief valve 50 is set to the maximum value, and the set pressure value of the electromagnetic relief valve 23 is set to D. (kg / cm 2 ), as a result, the piston side of the compression cylinder 34 becomes D (kg / cm 2 ), and the piston plate 35 moves to the right in the figure, resulting in a compression plate. Advance 33 to shrink the capacity of the cavity 18 to the volume of the molded product.
  • the set pressure value of the electromagnetic relief valve 23 can be set within a range up to the upper limit D kg / cm 2 shown by oblique lines in the drawing according to the molding conditions of the ultra-high molecular weight polyethylene.
  • the solenoid a of the electromagnetic switching valve 36 is excited to move the piston rod 35 to the right in the figure, thereby advancing the compression plate 33 and protruding the molded product from behind to form a die. Release from 10 Next, when the solenoid a of the electromagnetic switching valve 36 is de-energized and the solenoid b is energized, the piston rod 35 moves leftward in the figure by the action of the pilot check valve 52. By doing so, the compression plate 33 is retracted to prepare for the next molding cycle.
  • the molded product obtained in the second to fifth embodiments does not generate residual stress due to molecular orientation, and has no cleaving, cracking, It was of high quality without causing layer separation or the like.
  • ultra-high molecular weight polyethylene which is a synthetic resin that is difficult to mold because of its extremely high melt viscosity
  • injection compression Although the molding method has been described, the injection compression molding method of the present invention can be compared ā‡ ] Even when applied to the molding of a synthetic resin having a low molecular weight or a low melt viscosity, a high quality molded product can be obtained.
  • thermoplastic resin having a lower molecular weight or a lower melt viscosity than ultra-high molecular weight polyethylene, for example, polystyrene, polyamide, polypropylene Etc. to obtain high quality molded products.

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

Description

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電ē£åˆ‡ę›å¼ 3 6ć®ć‚½ ćƒ¬ćƒŽć‚£ 惉 ać‚’åŠ±ē£ć—ć¦ćƒ”ć‚¹ 惈 ćƒ³ćƒ­ 惃 惉 35ćŒå›³ äøŠå³ę–¹ćøē§»å‹•ć™ć‚‹ 恓 ćØć«ć‚ˆ ć‚Šåœ§ēø®ćƒ—ćƒ¬ćƒ¼ 惈 33ć‚’å‰é€²ć•ć›ć¦ęˆå½¢å“ ć‚’čƒŒå¾Œć‹ć‚‰ēŖćå‡ŗć—ć¦é‡‘åž‹ 1 0ć‹ć‚‰é›¢åž‹ć•ć›ć‚‹ć€‚ ꬔ恄恧态 電ē£åˆ‡ę› 弁 36ć®ć‚½ ćƒ¬ćƒŽć‚£ 惉 ać‚’åŠ±ē£ć‚’ę–­ć£ć¦ć‚½ ćƒ¬ćƒŽć‚£ 惉 bć‚’åŠ±ē£ć™ć‚‹ćØ态 惑悤 惭 惃 惈惁惱 惃 ć‚Æ弁 52ć®ä½œē”Øć«ć‚ˆ 悊 ćƒ”ć‚¹ 惈 ćƒ³ćƒ­ 惃 惉 35ćŒå›³äøŠå·¦ ę–¹ćøē§»å‹•ć™ć‚‹ 恓ćØć«ć‚ˆć‚Šć€ 圧ēø®ćƒ—ćƒ¬ćƒ¼ 惈 33ć‚’å¾Œé€€ć•ć›ć¦ę¬”ć®ęˆå½¢ 悵悤ć‚Æćƒ«ć«å‚™ćˆć‚‹ć€‚
前čæ°ć®ē¬¬ 2å®Ÿę–½ä¾‹ä¹ƒč‡³ē¬¬ 5å®Ÿę–½ä¾‹ć«ćŠć„ć¦å¾—ć‚‰ć‚Œć‚‹ęˆå½¢å“ć‚‚ć€ ē¬¬ 1 å®Ÿę–½ä¾‹ć«å¾—ć‚‰ć‚ŒćŸęˆå½¢å“ćØåŒę§˜ć«ć€ åˆ†å­é…å‘ć«čµ·å› ć™ć‚‹ę®‹ē•™åæœåŠ› ćÆē™ŗē”Ÿć›ćšć€ ć‚Æ ćƒ¬ćƒ¼ć‚øćƒ³ć‚°ć€ ć‚Æ惩 ćƒƒć‚­ćƒ³ć‚°ć€ 層ēŠ¶å‰é›¢ē­‰ć‚’起恓恕ćŖ ć„é«˜å“č³Ŗć®ć‚‚ć®ć§ć‚ć£ćŸć€‚
ć¾ćŸć€ 前čæ°ć®å„å®Ÿę–½ä¾‹ć«ćŠć„ć¦ćÆ态 射å‡ŗęˆå½¢ć«ē”Ø恄悉悌悋ēØ®ēØ®ć® åˆęˆęØ¹č„‚ć®ć†ć”ć§ć‚‚ęŗ¶čžē²˜åŗ¦ćŒę„µć‚ć¦é«˜ć„ćŸć‚ć«ęˆå½¢å›°é›£ćŖåˆęˆęع č„‚ć§ć‚ć‚‹č¶…é«˜åˆ†å­é‡ćƒćƒŖć‚Ø惁 ćƒ¬ćƒ³ć‚’ęę–™ę¦­č„‚ćØ ć—ć¦ćć®å°„å‡ŗ圧ēø®ęˆ å½¢ę–¹ę³•ć‚’čŖ¬ę˜Žć—ćŸćŒć€ Ā·ęœ¬ē™ŗę˜Žć®å°„å‡ŗ圧ēø®ęˆå½¢ę–¹ę³•ćÆęÆ”č¼ƒ^]低分子量 ć¾ćŸćÆęŗ¶čžē²˜åŗ¦ćŒå°ć•ć„åˆęˆęØ¹č„‚ć®ęˆå½¢ć«é©ē”Ø恗恦悂态 高品č³Ŗ恮ꈐ å½¢å“ćŒå¾—ć‚‰ć‚Œć‚‹ć€‚ ē”£ę„­äøŠć®åˆ©ē”ØåÆčƒ½ę€§
ęœ¬ē™ŗę˜Žć«ć‚ˆć‚Œć°ć€ 前čæ°ć•ć‚ŒćŸć‚ˆć†ćŖęˆå½¢å›°é›£ćŖč¶…é«˜åˆ†å­é‡ćƒćƒŖ悧 ćƒćƒ¬ćƒ³ć®ćæ恧ćÆćŖ恏 态 č¶…é«˜åˆ†å­é‡ćƒćƒŖć‚Øćƒćƒ¬ćƒ³ć‚ˆć‚Š ć‚‚ä½Žåˆ†å­é‡ć¾ćŸ ćÆęŗ¶čžē²˜åŗ¦ć®ä½Žć„ē†±åÆå”‘ę€§ęØ¹č„‚ć€ ä¾‹ćˆć°ćƒćƒŖ ć‚¹ćƒćƒ¬ćƒ³ć€ 惝ćƒŖć‚¢ćƒŸ 惉态 惝ćƒŖ ćƒ—ćƒ­ćƒ”ćƒ¬ćƒ³ē­‰ć«ć‚‚適ē”Ø恧恍态 高品č³Ŗć®ęˆå½¢å“ć‚’å¾—ć‚‹ć“ćØ恌恧恍

Claims

請걂恮ēƄ囲
1. (a) åÆå‹•é‡‘åž‹ć®čƒŒå¾Œć‹ć‚‰ęŠ¼åœ§åŠ›ć‚’ä»˜åŠ ć™ć‚‹ć“ćØć«ć‚ˆć‚Šē›®ēš„ć®ęˆå½¢ 品容ē©ä»„äø‹ć«åŽēø®ć•ć›ćŸć‚­ćƒ¤ ćƒ“ćƒ†ć‚£ 内éƒØćøåÆå”‘åŒ–åˆęˆęØ¹č„‚ć‚’å°„ å‡ŗå……å””ć—ć€
(b) 前čؘåÆå”‘åŒ–åˆęˆęØ¹č„‚ć‚’å°„å‡ŗå……å””ēµ‚äŗ†å¾Œć€ åÆå‹•é‡‘åž‹ć®čƒŒå¾Œć‹ć‚‰ ä»˜åŠ ć™ć‚‹ęŠ¼åœ§åŠ›ć‚’ä½Žäø‹ć•ć›ć€
(c) 前čØ˜ć‚­ćƒ¤ ćƒ“ćƒ†ć‚£ 内éƒØć«åœ§ēø®ć•ć‚Œć¦å……å””恕悌恟åÆå”‘åŒ–åˆęˆęØ¹č„‚ ć®å¼¾ę€§å›žå¾©åæœåŠ›ć«ć‚ˆć‚Šć‚­ćƒ¤ ćƒ“ćƒ†ć‚£å®¹ē©ć‚’ęˆå½¢å“å®¹ē©ä»„äøŠć«ę‹”大 恕恛态
(d) 前čØ˜å¼¾ę€§å›žå¾©åæœåŠ›ćŒē·©å’Œć•ć‚ŒćŸå¾Œć€ å†ć³å‰čؘåÆå‹•é‡‘åž‹ć®čƒŒå¾Œ ć‹ć‚‰ä»˜åŠ ć™ć‚‹ęŠ¼åœ§åŠ›ć‚’äøŠę˜‡ć•ć›ć‚‹ć“ ćØć«ć‚ˆ 悊 悭惤 ćƒ“ćƒ†ć‚£å®¹ē©ć‚’ ęˆå½¢å“å®¹ē©ć¾ć§åœ§ēø®ć™ć‚‹ć“ćØ悒ē‰¹å¾“ćØć™ć‚‹å°„å‡ŗęˆå½¢åœ§ēø®ę–¹ę³•ć€‚
2. 前čؘē›®ēš„ć®ęˆå½¢å“å®¹ē©ä»„äø‹ć«åŽēø®ć•ć›ćŸć‚­ćƒ¤ ćƒ“ćƒ†ć‚£ 内éƒØ恫态 悭 ćƒ£ ćƒ“ćƒ†ć‚£ 内éƒØćø射å‡ŗå……å””ć•ć‚ŒćŸåÆå”‘åŒ–åˆęˆęØ¹č„‚ć®ęØ¹č„‚åœ§åŠ›ćŒå°‘ćŖ 恏 ćØć‚‚å¼¾ę€§å›žå¾©åæœåŠ›ć‚’ē”Ÿćšć‚‹åœ§åŠ›ć«äøŠę˜‡ć™ć‚‹ć¾ć§åÆå”‘åŒ–åˆęˆęØ¹č„‚ ć‚’å°„å‡ŗå……å””ć™ć‚‹ć“ćØ悒ē‰¹å¾“ćØ恙悋請걂項 1 恫čØ˜č¼‰ć®å°„å‡ŗ圧ēø®ęˆå½¢ ę–¹ę³•ć€‚
3. 前čØ˜ć‚­ćƒ¤ ćƒ“ćƒ†ć‚£ 内éƒØćøåÆå”‘åŒ–åˆęˆęØ¹č„‚ć‚’å°„å‡ŗå……å””ć—ćŸå¾Œć€ ē›“恔 ć«å°„å‡ŗåœ§åŠ›ć‚’ä½Žäø‹ć•ć›ć‚‹ć“ćØ悒ē‰¹å¾“ćØ恙悋請걂項 1 ć¾ćŸćÆ 2 恫čؘ č¼‰ć®å°„å‡ŗ圧ēø®ęˆå½¢ę–¹ę³•ć€‚
4. 前čØ˜å¼¾ę€§å›žå¾©åæœåŠ›ć«ć‚ˆć‚‹ć‚­ćƒ¤ ćƒ“ćƒ†ć‚£å®¹ē©ć®ę‹”å¤§é‡ć«č¦åˆ¶ć‚’čØ­ć‘ 悋恓ćØ悒ē‰¹å¾µćØ恙悋請걂項 1ä¹ƒč‡³ 3ć®ć„ćšć‚Œć‹ć«čØ˜č¼‰ć®å°„å‡ŗ圧ēø® ęˆå½¢ę–¹ę³•ć€‚
5. 前čؘåÆå‹•é‡‘åž‹ć®čƒŒå¾Œć‹ć‚‰ä»˜åŠ ć™ć‚‹ęŠ¼åœ§åŠ›ć®ä½Žäø‹ć¾ćŸćÆäøŠę˜‡ćÆ态 åœ§ę²¹ć‚’ēµ¦ęŽ’恙悋恓 ćØ ć«ć‚ˆ ć‚Šé§†å‹•ć™ć‚‹åœ§ēø®ć‚·ćƒŖ ćƒ³ćƒ€ć«äæ‚åˆć•ć‚ŒćŸåœ§ ēø®ćƒ—ćƒ¬ćƒ¼ 惈恮ē§»å‹•ć«ć‚ˆć‚Šåˆ¶å¾”恕悌悋恓ćØ悒ē‰¹å¾“ćØ恙悋請걂項 1乃 č‡³ 4 ć®ć„ćšć‚Œć‹ć«čØ˜č¼‰ć®å°„å‡ŗ圧ēø®ęˆå½¢ę–¹ę³•ć€‚
6. 前čؘ圧ēø®ć‚·ćƒŖ ćƒ³ćƒ€ćøć®åœ§ę²¹ć®ēµ¦ęŽ’ćÆ态 ć“ć®åœ§ēø®ć‚·ćƒŖ ćƒ³ćƒ€ćØåœ§ę²¹ ęŗćØć®é–“ć®åœ§ę²¹ē®”č·ÆäøŠć«čØ­ć‘ć‚‰ć‚Œć‚‹ćØćØ悂恫态 ć“ć®åœ§ę²¹ē®”č·ÆäøŠć« čØ­ē½®ć•ć‚Œć‚‹é›»ē£åˆ‡ę›å¼ćØ圧ēø®ć‚·ćƒŖ ćƒ³ćƒ€ćØ恮間恫äø¦åˆ—ć«é…ē½®ć•ć‚Œć‚‹ ćƒŖ ćƒŖ ćƒ¼ćƒ•å¼ćŠć‚ˆć³ć€ 惁悧惃ć‚Æå¼ć¾ćŸćÆ惑悤惭惃 惈惁悧惃ć‚Æå¼ć«ć‚ˆ ć‚Šåˆ¶å¾”ć•ć‚Œć‚‹ć“ćØē‰¹å¾µćØ恙悋請걂項 5 恫čØ˜č¼‰ć®å°„å‡ŗ圧ēø®ęˆå½¢ę–¹ę³•,
PCT/JP1991/000978 1990-08-03 1991-07-23 Injection-compression-molding method WO1992002352A1 (en)

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JP2022068921A (ja) * 2020-10-23 2022-05-11 ę Ŗ式会ē¤¾ę—„ęœ¬č£½é‹¼ę‰€ 射å‡ŗ圧ēø®ęˆå½¢ę–¹ę³•ć€å°„å‡ŗč£…ē½®ćŠć‚ˆć³å°„å‡ŗęˆå½¢ę©Ÿ

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JP3215620B2 (ja) * 1996-02-27 2001-10-09 ę Ŗ式会ē¤¾ćƒ†ćƒ©ćƒ«ć‚­ćƒØć‚Æćƒˆć‚¦ ęØ¹č„‚č£½ć‚³ćƒ³ć‚ÆćƒŖćƒ¼ćƒˆåž‹ęž ćƒ‘ćƒćƒ«ć®ęˆå½¢ę³•åŠć³äøŠčØ˜ę–¹ę³•ć«ć‚ˆć‚Šęˆå½¢ć•ć‚ŒćŸć‚³ćƒ³ć‚ÆćƒŖćƒ¼ćƒˆåž‹ęž ćƒ‘ćƒćƒ«
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JPH0720650B2 (ja) 1995-03-08

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