CN101288996A

CN101288996A - Forming method of light guide plate

Info

Publication number: CN101288996A
Application number: CNA2007101496606A
Authority: CN
Inventors: 蛯名利幸
Original assignee: Meiki Seisakusho KK
Current assignee: Meiki Seisakusho KK
Priority date: 2007-04-18
Filing date: 2007-09-10
Publication date: 2008-10-22
Also published as: JP2008284867A

Abstract

The invention provides a method for forming a light guide plate, which can shorten both the forming time and the taking-out time of the light guide plate when the light guide plate is formed by injection forming including injection compression forming, thereby shortening the forming cycle time. In the method for molding a light guide plate by injection molding, the time from completion of mold closing, injection, and start of mold opening is within 1.75 to 6 seconds, and the time from start of mold opening, removal of the light guide plate, and completion of mold closing is within 0.75 to 2.2 seconds, thereby shortening the molding cycle time.

Description

The manufacturing process of LGP

Technical field

The present invention relates to carry out in mould by the injection molding that comprises injection compression molding the manufacturing process of LGP of the shaping of LGP, particularly employed diagonal-size such as portable phone is the manufacturing process of the LGP below 7 inches.

Background technology

Manufacturing process/the removing method of LGP that comprises the injection molding of injection compression molding as utilization, known have a method of being put down in writing in the patent documentation 1.Patent documentation 1 relates to the shaping of large-scale LGP, and under the situation of these large-scale LGPs that is shaped, only curring time (finishing through penetrating the time up to the beginning die sinking from mold closing) just needs more than 30 seconds usually.In addition, the removing method that patent documentation 1 is put down in writing is owing to be from taking out the method that LGP moves to it other mounting position again between 2 pull bars of upside, therefore having problems aspect the shortening that is shaped circulation timei.Therefore, in patent documentation 1, need more than 40 seconds 1 circulation timei that is shaped.In addition, about the shaping circulation timei of small-sized light conducting plate, for the transfer printing of carrying out pattern is shaped, above-mentioned curring time is very long, and takes out and also expend time in, therefore, common 1 time shaping needs more than 15 seconds circulation timei, is also having problems aspect the shortening that is shaped circulation timei.

Patent documentation 1: TOHKEMY 2003-145593 communique (4 of claims the, Fig. 2)

Summary of the invention

The present invention in view of the above problems, its purpose is to provide a kind of manufacturing process of LGP, when comprising the injection molding shaping LGP of injection compression molding, can shorten the curring time and the take-off time both sides of LGP, thereby shorten the circulation timei that is shaped.

The manufacturing process of the LGP that technical scheme 1 of the present invention is put down in writing, it is the manufacturing process of LGP that comes in mould, to carry out the shaping of LGP by injection molding, it is characterized in that: finish through penetrating till the beginning die sinking from mold closing and carried out with the interior time, begin die sinking certainly and till mold closing is finished, carried out with the interior time with 0.75～2.2 second through taking out LGP with 1.75～6 seconds.

The manufacturing process of the LGP of the shaping of in mould, carrying out LGP by injection molding of the present invention, because finishing the process ejaculation from mold closing carries out with the interior time at 6 seconds up to the beginning die sinking, finish at 2.2 seconds up to mold closing through the taking-up of LGP from the beginning die sinking and to carry out, therefore can realize the unthinkable in the past shaping shortening of circulation timei with the interior time.

Description of drawings

Fig. 1 is the front view of the withdrawing device of the LGP of observation present embodiment from the movable plate side towards the fixed disk side.

Fig. 2 is the side view of withdrawing device of the LGP of present embodiment.

Fig. 3 is the major part amplification stereogram of withdrawing device of the LGP of present embodiment.

Fig. 4 is the sectional view of the injection compression molding die of the employed LGP of present embodiment.

Fig. 5 is the chart of injection compression molding method of the LGP of expression present embodiment.

Fig. 6 is the chart of injection compression molding method of the LGP of expression present embodiment.

Fig. 7 is the chart of injection compression molding method of the LGP of expression present embodiment.

Fig. 8 is the amplification sectional view of sprue bush of injection compression molding die of the LGP of present embodiment.

Fig. 9 be the expression present embodiment LGP injection compression molding die water road shape and the figure of the relation of the circulation timei that is shaped.

Figure 10 be the expression present embodiment LGP injection compression molding die water road shape and the figure of the relation of the circulation timei that is shaped.

Figure 11 be the expression present embodiment LGP injection compression molding die water road shape and the figure of the relation of the circulation timei that is shaped.

Figure 12 be the expression present embodiment LGP injection compression molding die water road shape and the figure of the relation of the circulation timei that is shaped.

Figure 13 be the expression present embodiment LGP injection compression molding die water road shape and the figure of the relation of the circulation timei that is shaped.

Figure 14 is the chart of ejaculation mould pressing method of the LGP of other embodiment of expression.

Label declaration

11: the injection compression molding machine

16: fixed mould

17: fixed disk

20: moveable die

21: movable plate

23: the 1 withdrawing devices

24: the 2 withdrawing devices

30: chuck

33: the absorption maintaining part

42: ribbon conveyer

A1: holding position

A2: delivery position (off-position)

A3: position of readiness

B1: delivery position (position of readiness)

B2: off-position

P: LGP

P1: running channel

P2: runner

P3: cast gate

The specific embodiment

The injection compression molding die of LGP of the present invention is described referring to figs. 1 through Figure 13.Fig. 1 is the front view of the withdrawing device of the LGP of observation present embodiment from the movable plate side towards the fixed disk side.Fig. 2 is the side view of withdrawing device of the LGP of present embodiment.Fig. 3 is the major part amplification stereogram of withdrawing device of the LGP of present embodiment.Fig. 4 is the sectional view of the injection compression molding die of the employed LGP of present embodiment.Fig. 5 to 7 is charts of injection compression molding method of the LGP of expression present embodiment.Fig. 8 is the amplification sectional view of sprue bush of injection compression molding die of the LGP of present embodiment.Fig. 9 to 13 be the expression present embodiment LGP injection compression molding die water road shape and the figure of the relation of the circulation timei that is shaped.

In the present embodiment, LGP P is formed by the injection compression molding as a field in the injection molding.Injection compression molding can change the shaping of the distance between moveable die and fixed mould during the shaping beginning is when being shaped end.Therefore, injection compression molding also comprises so-called ejaculation mold pressing, and the stop position that this ejaculation is embossed in behind the mold closing penetrates molten resin, moveable die is advanced at that and compresses.In these injection compression moldings, owing to compare when finishing, begin to penetrate preceding or begin to penetrate the back die cavity and be in the state of opening slightly with shaping, thus do not need to have the ejecting device that penetrates ability at a high speed, and can be with than low speed, penetrate molten resin than low pressure.In addition owing to after beginning to penetrate, moveable die is moved with the compression molten resin towards the matched moulds direction, therefore have die cavity can accelerate molten resin apart from gate part position far away flow the advantage of carrying out fine transfer printing well.And then, after cutting off cast gate, in common ejection shaping mould, can't carry out pressurize, but under the situation of injection compression molding, the compression of the molten resin in the die cavity can be dealt with the contraction that is produced by cooling curing from ejecting device.This injection compression molding is especially in that to carry out comparing with the area of light-emitting face etc. thickness of slab favourable during the shaping of thin LGP especially.

As depicted in figs. 1 and 2, in injection compression molding machine 11, the ejecting device 13 and the mold closing mechanism 14 that will possess cartridge heater 12a (in establish screw rod), nozzle 12b are equipped on the lathe bed 15.Mold closing mechanism 14 is equipped with 4 pull bars 19 being fixed in lathe bed 15 and the fixed disk 17 of fixed mould 16 being installed and being provided in being subjected on the lathe bed 15 between the platen 18.The movable plate 21 that moveable die 20 is installed runs through movably and is inserted in the above-mentioned pull bar 19.In addition, be subjected to be equipped with on the platen 18 closing cylinder 22 as die opening and closing/clamping that carries out die opening and closing and matched moulds, the piston 22a of above-mentioned closing cylinder 22 is fixed on the back side of movable plate 21.The closing cylinder 22 of present embodiment is to make movable plate can carry out the type of mold closing with high speed by the long-pending little servo-cylinder discharge pressure oil of the control pair cross-section of servo valve.In addition, the closing cylinder 22 of present embodiment is also by the control of servo valve pressure oil to be delivered to the little die sinking side grease chamber of sectional area and can be with the type of at a high speed carrying out die sinking when die sinking.In the present embodiment, all respectively can be as high standard to carry out die opening and closing in 0.3 second in mold closing/die sinking side.In the present embodiment, though die opening and closing/clamping illustrates the example by the closing cylinder 22 of servo valve control, also can use and contain starting rotation actuating speed and stop the servo motor of speed excellence and the toggle mechanism of ball screw framework.Also can realize above-mentioned speed in this case.

Next the withdrawing device that takes out the LGP P after being shaped from the injection compression molding die 51 of injection compression molding machine 11 is described.As depicted in figs. 1 and 2, withdrawing device is made of the 1st withdrawing device 23 of the upper surface of the anti-fore side that is fixed on fixed disk 17 (opposition side of operation board) and the 2nd withdrawing device 24 that is arranged at the top of the carriage 25 on the part of the anti-fore side that is fixed on lathe bed 15.The 1st withdrawing device 23 die opening and closing directions are provided with rotating shaft 26, and with the direction of above-mentioned rotating shaft 26 quadratures on be fixed with arm 27.Rotating shaft 26 be set to can by the 1st not shown servo motor and ball screw framework vertically (die opening and closing direction) advance and retreat move, and can rotate by the 2nd not shown servo motor driven, can carry out high speed motion accurately and stop rapidly.Thus, the 1st withdrawing device 23 is called as the swing arm withdrawing device.The arm 27 that directly takes out the 1st withdrawing device 23 of LGP P etc. from moveable die 20 has set thickness, the arm member of the roughly L word shape that is become one by the 1st parts 27a, the 2nd parts 27b and the 3rd parts 27c constitutes, and described the 1st parts 27a is near the vertical direction setting towards rotating shaft 26 of a side of rotating shaft 26; Described the 2nd parts 27b and the 1st parts 27a along inclined direction are provided with continuously; Described the 3rd parts 27c and above-mentioned the 2nd parts 27b be provided with continuously and along with the direction setting of the 1st parts 27a approximate vertical.In addition, the part of above-mentioned the 3rd parts 27c is crooked to the inside near the die cavity formation face of moveable die 20.In addition, the shape of arm 27 only otherwise interfere pull bar 19 and safety door etc. also can adopt other shapes such as the rectangular shaped that is made of both sides and circular shape.

In the present embodiment, the arm of the 1st withdrawing device is formed by carbon and realizes lighting.Perhaps also can be by constituting arm as a kind of aluminium of the proportion material lighter etc. than iron.In addition, the body weight that comprises the motor part is 15～25kg, therefore becomes low inertia structure.In addition, the servo motor as drive source adopts starting rotation actuating speed and the motor that stops the speed excellence.Therefore, behind input die sinking signal, it is 0.04 second that arm moves to the time of moving into the position from position of readiness, the absorption take-off time is 0.07 second, from taking out of the arm traveling time that rotation beginning stops up to rotation is 0.04 second, up to exporting the mold closing signal, the fastest specification of the 1st withdrawing device is for adding up to 0.15 second.In addition, under the situation of taking out 27 inches LGPs, also be to expend the same time.In addition, no matter be that LGP is not easy the situation of adhering to easily from the situation of the die cavity demoulding or the vestige of absorption maintaining part, taking out the required time by the 1st withdrawing device can be above 1.0 second.

As shown in Figure 3, the 3rd parts 27c of the arm 27 of the 1st withdrawing device 23 is face tabular with the face of fixed mould side and moveable die side, is formed with V groove 28 in its front towards base portion side, is formed with branching portion 29a, 29b in V groove 28 both sides.In addition, the inner space portion at above-mentioned V groove 28 is equipped with chuck 30.Chuck 30 makes 2 chuck parts carry out on-off action by the movement device 30a of electromagnet type, carrying out controlling or discharging of running channel P1, described movement device 30a is provided in the bonding part of the above-mentioned branching portion 29a of ratio, 29b of fixed mould side more by on the face of base portion side.In addition, near the face of the moveable die side the bonding part of above-mentioned branching portion 29a, 29b, be equipped with the detecting sensor 31 of reflection-type.Whether above-mentioned detecting sensor 31 detects holding running channel P1, under the situation that running channel P1 is not normally controlled, makes die opening and closing/clamping stop action.

In addition, on the direction vertical, be equipped with installing plate 32 with respect to the 3rd parts 27c of arm 27.Ratio the 3rd parts 27c of the installing plate 32 more length of top and lower part is respectively the roughly consistent length of longitudinal length with the LGP P that will be shaped.In addition, on the face of moveable die 20 sides of this installing plate 32,, be fixed with the absorption maintaining part 33 that is used to adsorb LGP P respectively at two positions, top and two positions, bottom of installing plate 32 towards moveable die 20 sides.Absorption maintaining part 33 possess the elastomeric material (sponge) of porous matter cup portion 34, be used for this glass portion 34 is installed in the spring portion 35 of the volume string shape on the installing plate 32 and pipe arrangement 36 etc.Cup portion 34 especially preferably uses the elastomer of excellent heat resistance, for example uses porous matter silicon rubber or porous matter fluorubber.In addition, cup portion 34 by have adsorption plane 34a that diameter is 8～16mm and thickness be about 5mm round plate 34b, be positioned at its rear V groove shape necking part 34c and be positioned at more that the base portion 34d at rear constitutes.In addition, above-mentioned base portion 34d is fixed in the spring portion 35 of volume string shape, and above-mentioned spring 35 the opposing party of portion are fixed on the installing plate 32.Adsorption plane 34a becomes the plane that is formed with the attraction hole 34e about diameter 1mm at the center and is formed with fine aperture around.In addition, above-mentioned attraction hole 34e forms and runs through above-mentioned round plate 34b, necking part 34c and base portion 34d vertically, is provided with the pipe arrangement of being made by the resin with bendability 36 continuously at the peristome of the base portion 34d side that attracts hole 34e.This pipe arrangement 36 by above-mentioned spring portion 35 inside and be fixed on the arm 27 and extend and be provided with, and advance to connect with not shown vacuum plant.

In addition, carriage 25 is fixed on lathe bed 15 sides of anti-operation board side of injection compression molding machine 11, the 2nd withdrawing device 24 is arranged on the top of carriage 25, it is the transfer robot of twin axle, and is provided with: the 1st rotating shaft 37 that sets abreast with the die opening and closing direction that can rotate the mode that drives and injection compression molding machine 11 and be adapted to and can be rotated the 2nd rotating shaft 39 of driving with respect to be fixed on fixed axis 38 on above-mentioned the 1st rotating shaft 37 along right angle orientation.In addition, above-mentioned the 1st rotating shaft 37 and the 2nd rotating shaft 39 all are respectively by the rotation of the 3rd not shown servo motor and the 4th servo motor driven, can both carry out high speed motion and stop rapidly with high accuracy.

In addition, the front end at the 2nd rotating shaft 39 is fixed with arm 40.Arm 40 has set thickness, near a side of above-mentioned the 2nd rotating shaft 39 successively by being connected the 2nd parts 40b formation that is provided with obliquely with set angle (being in the present embodiment) towards the about 60 ° angle of injection compression molding pusher side with respect to vertical direction with the 1st parts 40a of above-mentioned the 2nd rotating shaft 39 coaxial settings with respect to above-mentioned the 1st parts 40a.In addition, the 2nd withdrawing device 24 can as one man stop with following direction: the direction of the 2nd parts 40b at delivery position (position of readiness) the B1 place of the orientation of the absorption maintaining part 33 at the delivery position of the 1st withdrawing device 23 (off-position) A2 place and the 2nd withdrawing device 24.

In addition, on the face of fixed mould 16 sides of the 2nd parts 40b of arm 40, to be equipped with absorption maintaining part 41 with above-mentioned the 1st withdrawing device 23 identical distance.The absorption maintaining part 41 of the 2nd withdrawing device 24 is the general absorption cups that possess rubber system liner, the method that absorption maintaining part 41 is installed on the arm 40 is to be installed on the arm 40 via spring, and the not shown flexible resin pipe arrangement that has is connected with the attraction hole of above-mentioned cup.In addition, the internal fixation of above-mentioned resin pipe arrangement by spring is connected setting on arm 40 and with not shown vacuum plant, and this puts identical with the 1st withdrawing device 23.

On the ground of the opposition side (and then being anti-fore side) that is positioned at injection compression molding machine 11 across above-mentioned the 2nd withdrawing device 24, on than the low position of the 1st rotating shaft 37 of above-mentioned the 2nd withdrawing device 24, be equipped with ribbon conveyer 42.Ribbon conveyer 42 is general types, intermittently drives the rubber strip 43 of set width by not shown motor.

As depicted in figs. 1 and 2, the funnelform chute 44 of opening above ejecting device 13 sides lathe bed 15 sides, the 2nd withdrawing device 24 of the anti-operation board side of injection compression molding machine 11 are equipped with.Chute 44 is provided in the below of delivery position (off-position) A2 of the 1st withdrawing device 23 as the storage member that is used to collect this running channel P1 when the 1st withdrawing device 23 discharges running channel P1.In addition, in Fig. 1 and Fig. 2, pipe 45 about chute 44 belows, from having omitted record midway, it can make running channel P1 fall to not shown collecting box, also can make pipeline be connected to the top of ejecting device, and above-mentioned running channel P1 be carried out the air conveyance, its input port from ejecting device is dropped into and recycled by means such as air.In addition, the moving area of these withdrawing

devices

23,24 and the moving area of moveable die 20 have adopted safety door or protection countermeasure, omit in the drawings.

Next utilize Fig. 4 that the injection compression molding die 51 of the LGP of present embodiment is described.Injection compression molding die 51 is by constituting as the moveable die 20 of the 1st mould with as the fixed mould 16 of the 2nd mould, between two

moulds

20,16 behind the matched moulds, form die cavity C1, the C2 of volume and variable thickness, to be used for injection compression molding or to penetrate die forming.Moveable die 20 is provided with die main body portion 52, core part 53 and movable frame portion 54 etc.Core part 53 is fixed in the die main body portion 52, and the movable frame portion 54 around it is installed in the die main body portion 52 by spring 54a.Therefore in moveable die 20, core part 53 and movable frame portion 54 can change relative position on the die opening and closing direction.In addition, on core part 53, be fixed with two die cavities and

form piece

55,55, on die

cavity formation piece

55,55, be formed with die cavity respectively and form

face

55a, 55a.

In addition, be equipped with the protrudent pin 56 of ejecting device on the relative position of sprue bush central portion and fixed mould 16 64 of die main body portion 52 and core part 53, this protrudent pin 56 advances by not shown drive unit, retreats by spring.In addition, the front end face of above-mentioned protrudent pin 56 is provided with and is used for running channel P1 to the 56a of the portion of nipping that moveable die 20 sides are extracted.In addition, form face 55a from the above-mentioned 56a of portion that nips towards each die cavity and be formed with the runner formation face 57 that forms runner P2 respectively.In addition, form the piece 55 adjacent gate cutting instruments 58 that are equipped with die cavity on moveable die 20, this gate cutting instrument 58 advances by not shown drive unit, retreats by spring.In addition, when gate cutting instrument 58 advances,, cast gate P3 can be cut off by staggered with the fixedly gate cutting instrument 65 of fixed mould 16.Moreover, in moveable die 20, be provided with the cooling die cavity and form the stream of the die cavity of face 55a with cooling medium stream 60 these two systems of cooling medium stream 59 and coolant flow channel formation face 57 and protrudent pin 56 etc.

In addition, as the fixed mould 16 of the 2nd mould by die main body portion 61, be formed with that the die cavity that die cavity forms face 62a forms piece 62, inserts 63, sprue bush 64, fixedly gate cutting instrument 65 and butt piece 66 etc. constitute.Sprue bush 64 is the paths when nozzle 12b penetrates molten resin, and 63 the surface of inserting forms runner and forms face 67.Fixedly gate cutting instrument 65 is adapted to that to form piece 62 adjacent and cooperate with gate cutting instrument 58 with die cavity.In addition, be provided with the die cavity stream of the running channel of cooling medium stream 69 and coolant flow channel formation face 67 and sprue bush 64 etc. with cooling medium stream 70 these two systems that the cooling die cavity forms face 62a in fixed mould 16, it belongs to cold runner (comprising running channel) type.In addition, in the present embodiment, in injection compression molding die 51, longitudinally be equipped with 2 die cavity C1, C2, but also can along continuous straight runs form 2 die cavities, and then, the number of die cavity for example can be 1 to 4 etc. a plurality of.In addition, determine the number and the configuration of the absorption maintaining part of withdrawing device accordingly with the number of above-mentioned die cavity and configuration.

Next utilize the caption of Fig. 5 to use the injection compression molding method of the LGP P that the injection compression molding machine 11 of present embodiment carries out.In the present embodiment, diagonal-size is that 3 inches, thickness of slab are that the LGP P of 0.4mm was at 4.4 seconds shaping internal shaping circulation timei.It is detailed to be 0.5 second die sinking time, take-off time 0.4 second, 0.5 second dwell, finishes 1.4 seconds time up to mold closing through the taking-up of LGP P from the beginning die sinking and carries out.In addition, should be preferably 2.2 seconds with interior (0.75～2.2 second) through the taking-up of LGP P up to the time that mold closing is finished from the beginning die sinking, more preferably 1.5 seconds with interior (0.75～1.5 second).Above-mentioned from the beginning die sinking through the taking-up of LGP P up to the time that mold closing is finished the fastest 0.75 second as mentioned above, be the shortest time that can realize by the withdrawing device of the swing type using die opening and closing/clamping of constituting by servo control mechanism and constitute by servo motor.In addition, above-mentioned die sinking, dwell were respectively 0.6 second as described later in the longest 2.2 seconds up to the time that mold closing is finished through the taking-up of LGP P from the beginning die sinking, and take-off time is 1.0 seconds.Take-off time needs the purpose of 1.0 seconds situation to be, is meant that air causes the very slow situation of stripping rate, or is connected to the LGP that is shaped with utmost point low speed to avoid taking place on the LGP situation of maintenance vestige.In addition, if further prolong the die opening and closing time, following problem then appears: not only can prolong and be shaped circulation timei and cause the production efficiency variation, and the holdup time of molten resin in the cartridge heater of ejecting device become long, perhaps nozzle can be cooled and produce cold burden spot (cold slug).Moreover, the time of finishing through penetrating up to the beginning die sinking from mold closing is 3.0 seconds, and it is detailed for penetrating 0.1 second time delay (pressurization time), 0.05 second ejaculation time, 0.45 second dwell time, 2.4 seconds cool times (cooling is inchoate from penetrating beginning in fact).Yet, should finish through penetrating different in 1.75～6 seconds scope from mold closing according to the shape (area, thickness of slab, transfer surface shape) of LGP up to the time of beginning die sinking, in order further to shorten the circulation timei that is shaped, preferably at 4 seconds with interior (1.75～4.0 seconds).

In addition, as long as the size of LGP P in this scope, just can not given to be shaped and bring too big influence circulation timei, but if will further shorten the circulation timei that is shaped, then can cause deficiency cool time of running channel P1 especially, the curing deficiency of running channel, the problem that therefore can take place that running channel can't be chosen etc.Fig. 6 and Fig. 7 are the charts of injection compression molding method of the LGP of expression present embodiment, and Fig. 6 circulation timei of representing to be shaped is 2.5 seconds example, and Fig. 7 circulation timei of representing to be shaped is 6 seconds example.Shown in the chart of the injection compression molding method of the LGP among Fig. 6, the detail that is shaped when being 2.5 seconds circulation timei is, 0.75 second die opening and closing time (comprising take-off time and interlude), penetrate 0.1 second time delay (pressurization time), 0.05 second ejaculation time, 0.4 second dwell time, 1.2 seconds cool times (finishing up to the beginning die sinking from mold closing is 1.75 seconds).In addition, as long as the size of LGP P in this scope, just can not given to be shaped and bring too big influence circulation timei, but if will further shorten the circulation timei that is shaped, then can cause deficiency cool time, the curing deficiency of the running channel P1 that wall thickness is the thickest, the problem that therefore can take place that running channel P1 can't choose etc.In addition, as shown in Figure 7, the LGP with pattern transferring of 3 inches of diagonal-size, thickness of slab 0.6mm (homogeneous thickness of slab) also can form by injection compression molding with 6.0 seconds shaping circulation timei, and be 3.9 seconds cool time at this moment.

As mentioned above, as the key element of the cool time in definite circulation timei that is shaped, the most influential is diameter and cone angle (depanning gradient) θ of running channel P1 as shown in Figure 8 in the present invention.In the present embodiment, the diameter of the nozzle bore of the nozzle of ejecting device (not shown) is 1.5mm.When carrying out the extracting of running channel, in order to remove the resin of spray nozzle front end well, the diameter of the hand-hole 64a of the nozzle bore side of sprue bush 64 need be greater than the diameter of nozzle bore, preferably the above hand-hole of 1.6mm.Fig. 9 to Figure 13 represents to use that to take out 2 diagonal-size be the result that 2.8 inches, thickness of slab are tested as the injection compression molding die of the LGP of the LGP P of 0.4mm, its test condition is: be used for cooling off the cooling water temperature that die cavity forms the

cooling medium path

59,69 of

face

55a, 62a and be respectively 90 ℃, nozzle temperature is 325 ℃, the anterior temperature of cartridge heater is 355 ℃, cartridge heater middle part temperature is 370 ℃, the cartridge heater rear part temperature is 360 ℃, and issuing velocity is 300mm/sec.

It is that the taper angle theta of amplifying expression among 1.6mm, Fig. 8 is 1 °, the length data when being the sprue bush 64 of 25mm that Fig. 9 is to use the diameter of hand-hole 64a.In this example, be under 70 ℃, 80 ℃ the situation at the chilling temperature of sprue bush 64, when being shaped circulation timei elongated (becoming more than 5 seconds), the hand-hole 64a of sprue bush 64 and the nozzle bore sub-cooled of nozzle can't be carried out the next problem that penetrates or sneak into the cold burden spot in formed products and produce.In addition, when the chilling temperature of sprue bush 64 is 90 ℃, thereby also become take place more than 6 seconds bad.Therefore have following problem: when the diameter of the hand-hole 64a of sprue bush 64 was 1.6mm, its practical scope became extremely narrow, when its numerical value more hour can't carry out practical setting adjustment.

It is that 2.0mm, taper angle theta shown in Figure 8 are 1 °, the length data when being the sprue bush 64 of 25mm that Figure 10 is to use the diameter of hand-hole 64a.In this example, under the situation of each chilling temperature, when being 2 seconds circulation timei when being shaped, the cooling that running channel P1 all may take place does not catch up with, the situation of gate cutting, represents good result in addition.Yet do not have economy when unnecessarily increasing circulation timei when being shaped.Moreover, when excessive overtime circulation timei that is shaped, nozzle can take place be cooled and make holdup time of problem that the flowability of molten resin descends and the molten resin in the cartridge heater long and cause the problem of resin deterioration (xanthochromia, stain).In addition, about the temperature of cooling water, under 40 ℃ situation, owing in formed products, begin to sneak into the cold burden spot, so preferably more than 50 ℃.Moreover, under 120 ℃ situation, owing to gate cutting took place in the time of 4 seconds, therefore as the chilling temperature that is shaped and adopts, preferably below 110 ℃.

It is that 2.3mm, taper angle theta shown in Figure 8 are 1 °, the length data when being the sprue bush 64 of 25mm that Figure 11 is to use the diameter of hand-hole 64a.In this example, be under 70 ℃ the situation, when becoming 3 seconds circulation timei gate cutting can take place at chilling temperature when being shaped, be under 80 ℃, 90 ℃ the situation at chilling temperature, gate cutting can take place when being 5 seconds circulation timei being shaped.

It is that 2.6mm, taper angle theta shown in Figure 8 are 1 °, the length data when being the sprue bush 64 of 25mm that Figure 12 is to use the diameter of hand-hole 64a.In this example, the diameter of runner connecting portion 64c is 3.47mm, and the cooling curing of this part needs the time.In addition, in this example, be under 70 ℃ the situation, when becoming 5 seconds circulation timei gate cutting can take place at chilling temperature when being shaped, be under 80 ℃, 90 ℃ the situation, when being 6 seconds circulation timei gate cutting can take place at chilling temperature when being shaped.Therefore, can make as described above preferred shaping be circulation timei 6 seconds with interior diameter in, diameter that we can say hand-hole 64a is that the situation of 2.6mm is the diameter of the upper limit.

Moreover Figure 13 is to use the diameter of hand-hole 64a to be respectively 1.6mm, 2.0mm, 2.3mm, 2.6mm, and taper angle theta is that 1.5 °, length are the sprue bush 64 of 25mm, the data when testing under chilling temperature is 70 ℃ condition.In this example, there are the slow especially problem of cooling curing of this thickest part of wall thickness in the diameter of runner connecting portion 64c and above-mentioned 2.9mm, 3.3mm, 3.6mm, the 3.9mm of being respectively accordingly.In addition, at the diameter of hand-hole 64a is that 2.6mm, runner connecting portion 64c diameter are that 3.9mm, taper angle theta are in 1.5 ° the example, be under 70 ℃ the situation at chilling temperature, gate cutting can take place when being 5 seconds circulation timei when being shaped, in the time of 6 seconds, can observe the elongation or the bending of running channel, therefore be judged as and be not suitable for practicality.Moreover, about other the diameter of hand-hole 64a, be that 1 ° situation is compared with the taper angle theta of the endoporus 64b of sprue bush 64, will be shaped bad circulation timei if do not prolong the shortest shaping.Therefore, the circulation timei that is shaped be 6 seconds with interior situation under, cool off the diameter 3.6mm of the runner connecting portion 64c of the slowest sprue bush 64 (having endoporus 64b), be the diameter of usage range maximum.

In addition, the preferred taper angle theta of the endoporus 64b of sprue bush 64 preferably from hand-hole 64a towards 0.5～2.0 ° of runner connecting portion 64c hole enlargement.But when the diameter of runner connecting portion 64c surpassed 3.6mm, even be 6 seconds (be 3.9 seconds cool time) circulation timei that is shaped, near the cooling curing the runner connecting portion 64c also can be slack-off, and the cut-out of running channel P1 may take place when die sinking.In a single day running channel P1 remains in the sprue bush 64, and then the progressive forming meeting is interrupted, and skilled operating personnel need carry out operation to take out running channel P1 in narrow space, also might mold damage.Moreover the wall thickness 64d that is provided with the part of cooling medium stream 70 at the minor diameter part of sprue bush 64 is preferably about 15～30mm.

Therefore in the present embodiment, temperature is controlled to be cooling medium (cooling water) about 50～110 ℃ by thermosistor and likens to and be low 40～100 ℃ of the glass transition temperature Tg of the Merlon of the resin that will be shaped, and the die cavity that forms face 55a to the die cavity that is used for cooling off moveable die 20 is with cooling medium stream 59, being used for coolant flow channel forms near the face 57 and the cooling medium stream 60 of protrudent pin 56, the die cavity that the die cavity that is used for cooling off fixed mould 16 forms face 62a is with cooling medium stream 69, being used for the running channel that coolant flow channel forms face 67 and sprue bush 64 etc. flows with cooling medium stream 70.In addition, also can make running channel lower than other stream, thereby promote the cooling of the most time-consuming running channel P1 of cooling, and prevent to lead silk with the temperature of the cooling medium in the cooling medium stream 70.

In addition, the temperature of the forward region of the cartridge heater 12a district of nozzle (near) is set at 340 ℃, and the molten resin of Merlon is measured.In addition, the temperature of the forward region of the above-mentioned cartridge heater 12a under the situation of use Merlon is set and is preferably set to 330～380 ℃.Then, closing cylinder 22 actions by as die opening and closing/clamping make moveable die 20 that is installed on the movable plate 21 and fixed mould 16 butts that are installed on the fixed disk 17, to carry out mold closing.Then make mold clamping force rise to 50～200kN and carry out matched moulds.Overcome the elastic force pressure of spring 54a thus and make the die main body portion 52 and movable frame portion 54 butts of moveable die 20, movable frame portion 54 is positioned at the position that retreats into rear with respect to core part 53.Die cavity C1, the C2 of the variable thickness that between fixed mould 16 and moveable die 20, forms the runner P2 of the cast gate P3 that comprises variable thickness then and be connected with this cast gate P3.At this moment, consider, preferably the air in die cavity C1, the C2 is aspirated from the viewpoint that molten resin is flowed in die cavity C1, C2.In addition, in the present embodiment, the nozzle of not shown ejecting device all the time with sprue bush 64 butts, shorten to be shaped circulation timei.

Then when having passed through set time delay, the nozzle 12b of never illustrated ejecting device 13 is via the issuing velocity ejaculation molten resin of sprue bush 64 with 100～400mm/sec.Pressure when the core part 53 of movable plate 21 and moveable die 20 etc. is subjected to penetrating and retreating once more.Thus, the movable frame portion 54 of moveable die 20 is positioned at than core part 53 position more on the front, the die cavity that the die cavity of fixed mould 16 forms face 62a and moveable die 20 forms the interval between the face 55a, compares with the position of initial mold clamping force effect shown in Figure 1, and maximum is widened about 50～200 μ m.Moreover the core part 53 by moveable die 20 retreats, molten resin can be injected to cast gate P3 sectional area become big die cavity C1, C2 in, can reduce the flow losses of molten resin.Its result is to have near the advantage that can not produce internal stress the cast gate of LGP P especially to penetrate molten resin than low speed, lower pressure.

Then, when the screw position of ejecting device 13 arrives set pressurize switching position, switch to holding pressure control from penetrating control.After switching to holding pressure control, carry out the matched moulds of high mold clamping force by closing cylinder 22, switching to holding pressure control and reducing mold clamping force through behind the certain hour.Perhaps also can when switching, pressurize reduce mold clamping force.In the present embodiment, and reduce mold clamping force roughly simultaneously, make the gate cutting instrument 58 0.45～0.8mm that advances, carry out the cut-out of cast gate P3 by not shown drive unit.At this moment, the gate cutting instrument 58 of moveable die 20 and the gate cutting instrument of fixed mould 16 65 are staggered, carry out the cut-out of cast gate P3.In addition, when carrying out gate cutting, the molten resin of cast gate P3 is not in completely crued state certainly.

Then, after having carried out the cut-out of cast gate P3 by gate cutting instrument 58, gate cutting instrument 58 remains on progressive position.Thus, from ejecting device 13 sides the molten resin in die cavity C1, the C2 is carried out pressurize by halves though become, but the driving by closing cylinder 22 is advanced moveable die 20, can the molten resin in die cavity C1, the C2 be compressed thus, therefore, even can not produce bubble, be shaped and can carry out good transfer printing because of cooling shrinks still.Moreover, in the meantime, in the cartridge heater 12a of ejecting device 13, carry out the metering of the employed molten resin of shaping next time.Then, before end cool time, begin to form the air flue etc. of

piece

62 and 66 of butt pieces, provide demoulding usefulness air (air blast) to die cavity C1, C2 from the die cavity that the movable frame portion 54 of moveable die 20 and die cavity form air flue, the fixed mould 16 of 55 of pieces.Then make closing cylinder 22 actions and carry out row pressure and die sinking successively.Then, from pressurize finish to the cool time that begins die sinking (comprising row pressure) be 2.4 seconds in the present embodiment.

Make closing cylinder 22 action then, movable plate 21 and moveable die 20 are moved and carry out die sinking.When beginning to carry out die sinking, the 56a of the portion of nipping of protrudent pin 56 front ends of the moveable die 20 running channel P1 (comprising runner P2) that can nip so can extract running channel P1 from the sprue bush 64 of fixed mould 16.About LGP P,, form face 55a and carry out die sinking with this state and be held in die cavity by the concavity mold shape of moveable die 20 again.Therefore, the running channel P1 behind gate cutting (comprising runner P2) is held in moveable die 20 with LGP P both sides with the state that separates, and moves towards the die sinking direction.In die sinking, at fixed mould 16 demoulding air that stops to jet.In present embodiment, beginning to carry out the time that die sinking to die sinking finishes from moveable die 20 is 0.5 second, and this die sinking time can change between 0.3～0.6 second.Again, opening stroke (being substantially equal to the interval of die sinking fixed mould 16 and moveable die 20 when finishing) is 60～100mm.

When receiving die sinking when finishing the die sinking of being sent and finishing signal, the rotating shaft 26 of the 1st withdrawing device 23 can be towards the counter clockwise direction rotation of the 1st figure, and make arm 27 and absorption maintaining part 33 grades from position of readiness A3 move and stop at die sinking after moveable die 20 near the opposed position of LGP P.Then, make above-mentioned rotating shaft 26 move 15～30mm towards the die sinking direction, arm 27 and absorption maintaining part 33 grades move to holding position A1.Thus, the adsorption plane 34a of the cup portion 34 of absorption maintaining part 33 can be connected to the reflecting surface (the die cavity formation face 62a institute transfer printing by fixed mould 16 is shaped) of LGP P respectively.The air that the absorption maintaining part 33 of the 1st withdrawing device 23 is carried out attracts, and is just to carry out simultaneously when above-mentioned withdrawing device 23 begins to move, and therefore can adsorb simultaneously when adsorption plane 34a butt.At this moment attraction be adopt-50～-more weak attraction about 120kpa, to avoid on the LGP P that of just being shaped, forming vestige.Again, constituted because the cup portion 34 of absorption maintaining part 33 is elastomeric materials (sponge) by porous matter, adsorption plane 34a all can be adsorbed on the LGP P, can avoid so more forming vestige on LGP P.Again, very short the only 4.4 seconds circulation timei that is shaped in present embodiment, the heat of the LGP P that of being shaped can reach glass portion 34 and make it arrive certain above temperature, and this point also is a key element of avoiding taking place vestige.

When the 1st withdrawing device 23 moved to holding position A1, detecting sensor 31 can be carried out following detection: whether normal status is between the chuck parts of the chuck 30 of V groove 28 inboards for the running channel P1 that chooses from sprue bush 64.When detecting sensor 31 detects running channel P1, make chuck 30 closures by the electromagnetic type movement device, and keep running channel P1 (comprising runner P2) with chuck 30.When adsorbing LGP P by absorption maintaining part 33, and control running channel P1 when (comprising runner P2) by chuck 30, the rotating shaft 26 of the 1st withdrawing device 23 and arm 27 are mobile a little towards the mold closing direction once again, and make LGP P form the face 55a demoulding from die cavity, make running channel P1 (comprising runner P2) break away from the 56a of the portion of nipping of protrudent pin 56 front ends simultaneously.Carry out at above-mentioned the 1st withdrawing device 23 during the demoulding of LGP P and running channel P1 (comprising runner P2), moveable die 20 carries out demoulding equally with the supply of air, with the demoulding of auxiliary LGP P etc.The part of the movable frame portion of moveable die is outwards opened or die cavity is advanced in face of forming, with the easier taking-up of carrying out LGP P.

Then, the rotating shaft 26 of the 1st withdrawing device 23 turns clockwise towards Fig. 1's, when arm 27 is rocked to the position shown in the double dot dash line (the 1st withdrawing device 23 and the 2nd withdrawing device 24 position overlapped in Fig. 1), and the rotation of the axle 26 that stops the rotation.Then, the rotating shaft 26 of the 1st withdrawing device 23 moves towards the die sinking direction once again, and makes arm 27 and absorption maintaining part 33 grades move to delivery position (off-position) A2.In present embodiment, since 23 actions of the 1st withdrawing device, LGP P is taken out with the state that separates with running channel P1, move to delivery position (off-position) A2 again, required time is 0.4 second altogether, also carries out the cooling of LGP P in the meantime.

The arm 40 of the 2nd withdrawing device 24 stop and standby in the solid line position of the 1st figure, to receive LGP P at delivery position (off-position) A2 from the 1st withdrawing device 23.Again, the absorption maintaining part 41 of the 2nd withdrawing device 24 had begun to carry out air and has attracted before being connected to LGP P.Compared to the absorption maintaining part 41 of absorption maintaining part 33, the 2 withdrawing devices 24 of the 1st withdrawing device 23 is to carry out powerful air with rough vacuum more to attract.Then the 1st withdrawing device 23 moves towards the die sinking direction, when the die cavity that passes through moveable die 20 of LGP P forms absorption maintaining part 41 that face 55a formed (present embodiment is a light-emitting face) is connected to the 2nd withdrawing device 24 and is adsorbed, absorption maintaining part 33 at the 1st withdrawing device 23 stops to carry out air attraction, the 1st withdrawing device 23 is retreated afterwards, receive LGP P at once by the 2nd withdrawing device 24.

At delivery position (off-position) A2, chuck 30 is opened, and the running channel P1 (comprising runner P2) that the chuck 30 of the 1st withdrawing device 23 is controlled falls in the chute 44 of below.Open the action that chuck 30 falls running channel P1, though can in running channel P1 handing-over, carry out, but may contact LGP P when running channel P1 falls, can be handover to from the 1st withdrawing device 23 at LGP P and carry out this action again after the 2nd withdrawing device 24 and the 1st withdrawing device 23 retreat towards the mold closing direction.After LGP P was handover to the 2nd withdrawing device 24 and running channel P1 and falls, the arm 27 of the 1st withdrawing device 23 moved to the position of readiness A3 shown in the single-point line of Fig. 1.Position of readiness A3 at the moving area of not interfering moveable die 20 and be not subjected in the scope of heat affecting etc. of mould, helps to shorten the circulation timei that is shaped the closer to the position of moveable die 20 grades more.

Behind the 1st withdrawing device 23 handing-over LGP P, when it retreats, the 1st rotating shaft 37 of the 2nd withdrawing device 24 can drive rotation towards the counter clockwise direction of Fig. 1, make fixed axis 38 swings on the vertical direction that is fixed in the 1st rotating shaft 37, simultaneously, the 2nd rotating shaft 39 that is installed on fixed axis 38 also is driven in rotation 90 °, follow the rotation of above-mentioned the 2nd rotating shaft 39, with respect to the 1st parts 40a of the arm 40 also half-twist of the 2nd parts 40b that is provided with continuously that tilts, and make absorption maintaining part 41 and its LGP P that is kept towards downside.Again, when arm 40 was rocked to off-position B2 shown in the double dot dash line of Fig. 1, the 1st rotating shaft 37 stopped the rotation and arm 40 stops swinging.Stop that then absorption maintaining part 41 is carried out air and attract, discharge LGP P, make on its balata belt of falling ribbon conveyer 42 43 to reflect prone mode.In the present embodiment, though be with the direction of the moving direction quadrature of balata belt 43 on two LGP P are fallen owing to drop down onto balata belt 43 tops, can't cause LGP P damage with minimum distance.

Discharge the 2nd withdrawing device 24 behind the LGP P, driving the

1st rotating shaft

37 and 30 rotations of the 2nd rotating shaft, and return delivery position (position of readiness) B1 once again with above-mentioned opposite mode.Loading the mode of next LGP P, ribbon conveyer 42 is implemented intermittently to drive, and make balata belt 43 march forward at a certain distance to.On balata belt 43, proceed the cooling of LGP P, carry out the bale packing operation with artificial or robot afterwards.

The 1st withdrawing device 23 and the 2nd withdrawing device 24 are controlled with controller by the not shown withdrawing device that is equipped in the injection compression molding machine 11.Above-mentioned withdrawing device is connected in the controller of not shown injection compression molding machine 11 with controller.Therefore, receive the air that carries out the 1st withdrawing device 23 from the beginning die sinking signal of injection compression molding machine 11 and attract, receive die sinking and finish signal and make the arm 27 of the 1st withdrawing device 23 begin rotation.Again, according to the action of the arm 27 of the 1st withdrawing device 23, the air that begins to carry out the 2nd withdrawing device 24 attracts and the action of arm 40.Move to delivery position (off-position) A2 of moveable die 20 outsides when the 1st withdrawing device 23 after, send beginning mold closing signal and carry out mold closing action.In present embodiment, from beginning mold closing to mold closing deadline of moveable die 20 be 0.5 second, this dwell can change in 0.3～0.6 second scope.For example, based on the viewpoint of endurance life of injection compression molding machine 11, injection compression molding die 51, quantification stability etc., not necessarily to pursue the most at a high speed opening speed, toold closing speed sometimes.

In present embodiment, withdrawing device the 23, the 24th adopts swing arm, makes 2 withdrawing

devices

23,24 carry out the handing-over of LGP P at delivery position, and so the reason of design is mainly and shortens circulation timei.In present embodiment, withdrawing device takes out the required time of LGP P (to be finished and the arm 27 of the 1st withdrawing device 23 is positioned at position of readiness A3 and begins action from die sinking, via taking out LGP P at holding position A1, the moving area that leaves moveable die 20 arrives the time of delivery position (off-position) A2) be 0.4 second.The above-mentioned time can be 0.15～1.0 second scope, shortens shaping during circulation timei when hope, can carry out in 0.15～0.4 second scope.In order further to avoid adsorbing on the LGP P of vestige attached to the back high temperature that is shaped of maintaining part 33, can reduce the butt speed of absorption maintaining part 33 or by the time moveable die 20 jet the more demoulding with air (winding-up air), but required time was extended to about 1.0 seconds.

In addition, some is overlapping for the die opening and closing action by making moveable die 20 and the action of withdrawing device 23, can be further shaping be shortened about 0.3～0.5 second circulation timei.For example, when detecting the moveable die 20 of the position before moving to die sinking and being near completion, make arm 27 actions of withdrawing device 23, make the intrusion action of die sinking action and arm 27 overlapping thus, to shorten the circulation timei that is shaped.In addition, detect arm 27 and absorption maintaining part 33 grades have moved to outside situation from the movable area of moveable die 20 by limit switch etc., before arriving delivery position A2, it sends beginning mold closing signal, it is overlapping that withdrawing from of mold closing action and arm 27 moved, and also can shorten the circulation timei that is shaped.

About the present invention,, also comprise those skilled in the art's change that purport is carried out according to the present invention certainly though particularize not is not limited to above-mentioned embodiment.About the 1st withdrawing device of swing arm, as long as can make the arm swing at least, can count being set as: arm integral body can not move towards the die opening and closing direction, and only the absorption maintaining part of arm front end moves towards the die opening and closing direction yet.Can be designed to: the 1st withdrawing device can not move towards the die opening and closing direction yet, the 2nd withdrawing device can move to join in the die opening and closing direction, at this moment, be adsorbed in the 1st withdrawing device, can set up an organization in addition or movable plate is advanced a little at mould in order to make LGP from mould.Again, about the mounting position of the 1st withdrawing device and the 2nd withdrawing device also can be on lathe bed, fixed disk, the mounting table on floor first-class in change.In the present invention,, in the off-position of mould outside LGP is taken out with the state that separates with running channel, therefore the 2nd withdrawing device and nonessential by the 1st withdrawing device again.For example can be designed to, further increase rotating driveshaft, LGP is the level of state in the off-position at the arm of the 1st withdrawing device of swing arm, with direct release and mounting on conveyer.About the absorption maintaining part of the 1st withdrawing device, can adopt the common rubber blanket or the bellows of multilayer (bellows type), material can adopt polyurethane rubber, acrylonitrile-butadiene rubber or the like, not special the qualification.About withdrawing device, also can adopt along continuous straight runs to be displaced into the withdrawing device of the horizontal movable type between the off-position of near the moveable die holding position and mould outside.At this moment, taking out required time is 0.8～2.2 second.Withdrawing device about horizontal movable type is provided with: be used for adsorbing LGP the absorption maintaining part, be used for controlling the chuck of running channel, and LGP and running channel are taken out with the state that separates.The absorption maintaining part wishes to use the porous matter elastomeric material of silicon rubber etc.

Again, in the present embodiment, though be that the injection compression molding die of the LGP used at the portable phone of 3 inches of diagonal-size explains, the size of LGP can be the scope below 7 inches more than 1.5 inches, and (being converted into area is 7.5cm ²Above 150cm ²Below.Comprise also that four corners do not have the bight but situation in above-mentioned areal extent).Again, employed mould, a plurality of LGPs of diagonal-size below 5 inches that can be shaped, or 1 LGP of 6～7 inches of the diagonal-size of being shaped.About the shape of LGP, except that the LGP of thickness of slab homogeneous, also comprise: the wedge type LGP that thickness of slab is more and more thinner from the light entrance face side towards opposite side can make light diffusing sheet that the light source of grade backlight sees through, lens or the like.Again, about the employed resin of the shaping of LGP, though only put down in writing the example of Merlon (for example grand LC1500 of the daf of the emerging product of bright dipping), as long as excellent in optical properties for example can be used methacrylic resin, cyclic olefin polymerization resin or the like other resins.Because according to the kind of resin, the temperature of molten resin and glass transition temperature have difference, certainly the temperature of the opportunity of gate cutting, cooling medium, being shaped circulation timei or the like also can be different.

Again, the LGP P of present embodiment owing to thickness of slab 0.4mm adopts the injection compression molding method, but under the situation about thickness of slab 0.2～0.4mm, can use the ejaculation mould pressing method.Penetrate mould pressing method, form the state of the interval broadness of die cavity in the mold closing position at first, and carry out supercharging, even therefore thickness of slab situation as thin as a wafer still can be to penetrate than low speed low pressure by hanging down mold clamping force or mold clamping force state near 0.Figure 14 is the chart of ejaculation mould pressing method of expression LGP, is with 4.2 seconds shaping be shaped the circulation timei LGP with pattern transferring of 3 inches of diagonal-size, thickness of slab 0.3mm (homogeneous thickness of slab).In present embodiment, be to describe, but also can be applicable to the situation of carrying out die opening and closing in vertical direction at the injection compression molding die of being installed on the injection compression molding machine that carries out die opening and closing in the horizontal direction again.

In the above-described embodiment, at movable frame portion 54 relatively the core part 53 flat pattern tool that supports that changes relative positions describe, be embedded in the recess of the opposing party's mould and form the so-called mosaic type mould of the die cavity of variable volume betwixt but the present invention also can be applicable to the protuberance of side's mould.In addition, in present embodiment, record be in mould, cast gate to be cut off fully by the gate cutting instrument, but the chuck of withdrawing device is possessed make the effect that running channel moves with respect to LGP or the effect of cut-out etc., LGP separated with running channel and take out by withdrawing device.

Claims

1. the manufacturing process of a LGP carries out the shaping of LGP by injection molding in mould, it is characterized in that,

Finish through penetrating from mold closing and to carry out with the interior time, begin die sinking certainly and finish at 0.75 second～2.2 seconds up to mold closing through the taking-up of LGP and carry out with the interior time at 1.75 seconds～6 seconds up to the beginning die sinking.

2. the manufacturing process of LGP as claimed in claim 1, it is characterized in that, about the taking-up of LGP, the arm that is installed on the rotating shaft of withdrawing device carries out 0.15 second～1.0 seconds time via the off-position that near the holding position the mould arrives the mould outside from the position of readiness of mould outside.

3. the manufacturing process of LGP as claimed in claim 2 is characterized in that, the arm of above-mentioned withdrawing device is handover to the 2nd withdrawing device in the off-position of mould outside with LGP.

4. as the manufacturing process of each the described LGP in the claim 1 to 3, it is characterized in that the diagonal-size of the LGP that is removed is below 7 inches behind above-mentioned mould internal shaping.

5. as the manufacturing process of each described LGP in the claim 1 to 4, it is characterized in that, the die cavity formation face of fixed mould and moveable die forms and can be cooled off with the cooling medium stream by die cavity, and the running channel that is equipped on fixed mould can be cooled off with the cooling medium stream by running channel, finishes through penetrating up to the beginning die sinking from mold closing and carries out with the interior time at 1.75 seconds～6 seconds.