CN101422956A - Injection molding method and device - Google Patents

Abstract

In an injection moulding method, vapor is supplied in a thermal medium channel of master mould. The mould is closed after heating a mould cavity forming side of master mould part for raising the temperature of mould cavity forming side. The temperature raising is stopped after the mould cavity forming side obtains a preset temperature, and melted synthetic resin J with a preset amount is injected into the mould cavity S. Afterwards, pressurized gas is injected between the back surface of synthetic resin J and the cavity forming surface of male mould part. The surface of synthetic resin J is pressed to the mould cavity forming surface for maintaining pressure. The pressure is maintained while cooling water is started to feed into the heat medium channel for hardening the synthetic resin on the surface of master mold. When the synthetic resin is hardened to a certain degree, the injection of pressurized gas is stopped, and furthermore the pressurized gas is discharged out of the device. Cold gas is injected between the back surface of synthetic resin and the mould cavity forming surface of male mould part when the discharging of pressurized gas to the outside is finished. Lastly the mould is opened when the synthetic resin is hardened to a degree that the synthetic resin can be taken out.

Description

Injection moulding method and Coinjection molding apparatus

Technical field:

The present invention relates to a kind of injection moulding method and Coinjection molding apparatus.Specifically, the present invention relates to a kind of injection moulding method and Coinjection molding apparatus that injects gas-pressurized between synthetic resin in die cavity and the die cavity formation face that be accompanied by.

Background technology:

In the past, for example disclosed in patent documentation 1 grade like that, proposed a kind of in injection before the synthetic resin of fusion, the face side die cavity formation face of the face side moulding that makes article shaped is heated the technology that improves transfer printing.

[patent documentation 1] Japan Patent spy opens the 6-254924 communique

Yet, synthetic resin through fusion is to move while cooling off in die cavity, so produce the situation that does not spread all over the terminal part of die cavity equably sometimes, especially when the thickness of slab attenuation of article shaped, have in flowing synthetic resin by way of fusion the problem of solidifying takes place, and since be make the inductor (inductor) that for example carries out high-frequency induction heating be clipped in fixed mould and move moulds between vibrate, so molding time is also longer.

Summary of the invention:

Therefore, the objective of the invention is to eliminate in view of the above problems and as much as possible the distortion or the transfer printing inequality of article shaped, and molding time is shortened.

Therefore, first invention is a kind of injection moulding method, and injection is through the synthetic resin of fusion and make it moulding in the die cavity that is formed between master mold and the male model, and described injection moulding method is characterised in that,

By in the hot media channel of described master mold, supplying with thermal medium, come that the die cavity of described master mold is formed the face side and heat and make it to begin and heat up,

After stopping described intensification, the synthetic resin through fusion of injection scheduled volume in described die cavity,

After described injection finishes, between the die cavity formation face of the described synthetic resin back side and described male model, inject gas-pressurized, so that the surface pressure of synthetic resin is carried out pressurize to the die cavity formation face of described master mold, utilize described gas-pressurized to carry out pressurize on one side, in the described hot media channel of described master mold, supply with cooling medium on one side, harden so that the die cavity of described master mold forms the synthetic resin of face side.

Second invention is characterized in that according to first invention, if described synthetic resin hardens to a certain degree, then discharges after the described gas-pressurized outside Coinjection molding apparatus, injects refrigerating gas between the die cavity formation face of the described synthetic resin back side and described male model.

The 3rd invention is according to first invention, it is characterized in that, when being provided with in the recess that is being formed at described male model upper surface when on article shaped, forming the thin-walled organizator of thinner wall section, the gas-pressurized that will be injected in the described die cavity via the slit between described thin-walled organizator and the described male model is collected in the storage tank, to prevent that the part on the die cavity formation face that described synthetic resin can be pressurized to described master mold is carried out pressurization more than the required degree, on the other hand, the gas-pressurized that is collected in the described storage tank is supplied to the part that can't fully pressurize via above-mentioned slit.

The 4th invention is according to first invention, it is characterized in that, when being provided with in the recess that is being formed at described male model upper surface when in article shaped, forming the opening organizator of peristome, the gas-pressurized that will be injected in the described die cavity via the slit between described opening organizator and the described male model is collected in the storage tank, to prevent that the part on the die cavity formation face that described synthetic resin can be pressurized to described master mold is carried out pressurization more than the required degree, on the other hand, the gas-pressurized that is collected in the described storage tank is supplied to the part that can't fully pressurize via described slit.

The 5th invention is a kind of Coinjection molding apparatus, and injection is through the synthetic resin of fusion and make it moulding in the die cavity that is formed between master mold and the male model, and described Coinjection molding apparatus is characterised in that,

In described master mold along described die cavity form supplying with the hot media channel that heat medium or cooling medium are used, and in described male model, form the gas injection channel with pressurized gas supply to described die cavity,

By in the hot media channel of described master mold, supplying with thermal medium, come that the die cavity of described master mold is formed the face side and heat and make it to begin and heat up,

After described intensification is stopped, the synthetic resin through fusion of injection scheduled volume in described die cavity,

After described injection finishes, between the die cavity formation face of the described synthetic resin back side and described male model, inject gas-pressurized via described gas injection channel, so that the surface pressure of synthetic resin is carried out pressurize to the die cavity formation face of described master mold,

Utilize described gas-pressurized to carry out pressurize on one side, to the described hot media channel of described master mold in supply with cooling medium on one side, so that forming the synthetic resin of face side, the die cavity of described master mold hardens.

The 6th invention is a kind of Coinjection molding apparatus, after the described die cavity formation face side to described master mold heats, injection is through the synthetic resin of fusion in the die cavity that is formed between master mold and the male model, and gas-pressurized is injected between the die cavity formation face of the described synthetic resin back side and described male model, so that the surface pressure of synthetic resin is carried out pressurize to the die cavity formation face of described master mold, described Coinjection molding apparatus is characterised in that

Utilize die matrix and be fixed on the cylindrical portion bottom surface that described male model in the formed recess on the described die matrix forms described die cavity, described die cavity is that the space by space of extending in the horizontal direction and the tubular that extends in vertical direction that is being communicated with described space is formed

Each upper surface end in the aligned portions of described die matrix and described male model, be frame shape ground respectively along described aligned portions and form the protuberance of giving prominence to upward to enter into the mode in the die cavity mutually, and when two protuberances are docked, forming groove on the top of two protuberances.

The 7th invention is a kind of Coinjection molding apparatus, after the described die cavity formation face side to described master mold heats, injection is through the synthetic resin of fusion in the die cavity that is formed between master mold and the male model, and gas-pressurized is injected between the die cavity formation face of the described synthetic resin back side and described male model, so that the surface pressure of synthetic resin is carried out pressurize to the die cavity formation face of described master mold, described Coinjection molding apparatus is characterised in that

Utilize the die matrix of fixing described male model to form the cylindrical portion bottom surface of described die cavity, described die cavity is that the space by space of extending in the horizontal direction and the tubular that extends in vertical direction that is being communicated with described space is formed,

Upper surface end at the described die matrix of aiming at the aligned portions of described male model, be frame shape ground along described aligned portions and form the protuberance that projects upwards to enter into the mode in the described die cavity, and between described protuberance and described male model, forming groove.

The 8th invention is a kind of Coinjection molding apparatus, after the described die cavity formation face side to described master mold heats, injection is through the synthetic resin of fusion in the die cavity that is formed between master mold and the male model, and gas-pressurized is injected between the die cavity formation face of the described synthetic resin back side and described male model, so that the surface pressure of synthetic resin is carried out pressurize to the die cavity formation face of described master mold, described Coinjection molding apparatus is characterised in that

Fixing to be used on article shaped forming the nested of thinner wall section in the embedded merging of the recess that is formed at described male model upper surface, described nested top enters in the described die cavity and the longitudinal section, top is upper base and is shorter than the trapezoidal shape of going to the bottom,

Forming protuberance at described nested upper surface, described protuberance enters in the described die cavity and has the hypotenuse portion of quadrature roughly with described nested hypotenuse portion.

The 9th invention is a kind of Coinjection molding apparatus, after the described die cavity formation face side to described master mold heats, injection is through the synthetic resin of fusion in the die cavity that is formed between master mold and the male model, and gas-pressurized is injected between the die cavity formation face of the described synthetic resin back side and described male model, so that the surface pressure of synthetic resin is carried out pressurize to the die cavity formation face of described master mold, described Coinjection molding apparatus is characterised in that

At described male model upper surface, so that the top of thin-walled formation portion enters into mode and the outstanding thin-walled formation portion that is used for forming thinner wall section on article shaped that forms in the described die cavity, the longitudinal section, top of described thin-walled formation portion is upper base and is shorter than the trapezoidal shape of going to the bottom,

Upper surface is forming protuberance in described thin-walled formation portion, and described protuberance enters in the described die cavity and has the hypotenuse portion of quadrature roughly with the hypotenuse portion of described thin-walled formation portion.

The tenth invention as the 8th invention or the 9th invention is characterized in that thin portion tapers off to a point respectively at the top of described protuberance.

The 11 invention is a kind of Coinjection molding apparatus, after the described die cavity formation face side to described master mold heats, injection is through the synthetic resin of fusion in the die cavity that is formed between master mold and the male model, and gas-pressurized is injected between the die cavity formation face of the described synthetic resin back side and described male model, so that the surface pressure of synthetic resin is carried out pressurize to the die cavity formation face of described master mold, described Coinjection molding apparatus is characterised in that

Fixing nestedly in the embedded merging of the recess that is formed at described male model upper surface, described nested top enters in the described die cavity and the longitudinal section, top is upper base and is shorter than the trapezoidal shape of going to the bottom,

Form first protuberance that enters into described die cavity respectively being positioned near described described male model upper surface nested, and

Form second protuberance respectively at described male model upper surface, described second protuberance have with the hypotenuse portion of described first protuberance roughly quadrature hypotenuse portion and enter in the described die cavity.

The 12 invention is a kind of Coinjection molding apparatus, after the described die cavity formation face side to described master mold heats, injection is through the synthetic resin of fusion in the die cavity that is formed between master mold and the male model, and gas-pressurized is injected between the die cavity formation face of the described synthetic resin back side and described male model, the surface pressure of synthetic resin is carried out pressurize to the die cavity formation face of described master mold, described Coinjection molding apparatus is characterised in that

Fixing to be used in article shaped forming the nested of peristome in the embedded merging of the recess that is formed at described male model upper surface, describedly nestedly entering in the described die cavity and the top abuts to described master mold,

On described nested peripheral part, forming the protuberance that enters in the described die cavity and and described protuberance between forming groove.

The 13 invention is a kind of Coinjection molding apparatus, after the described die cavity formation face side to described master mold heats, injection is through the synthetic resin of fusion in the die cavity that is formed between master mold and the male model, and gas-pressurized is injected between the die cavity formation face of the described synthetic resin back side and described male model, so that the surface pressure of synthetic resin is carried out pressurize to the die cavity formation face of described master mold, described Coinjection molding apparatus is characterised in that

Fixing to be used on article shaped forming the nested of peristome in the embedded merging of the recess that is formed at described male model upper surface, describedly nestedly entering in the described die cavity and the top abuts to described master mold,

On described nested peripheral part, forming first protuberance that enters in the described die cavity and and described first protuberance between forming groove,

Forming second protuberance that enters into to surround the mode of described first protuberance in the described die cavity at described male model portion upper surface from the outside,

Between described second protuberance and described first protuberance, forming groove.

The 14 invention is a kind of Coinjection molding apparatus, after the described die cavity formation face side to described master mold heats, injection is through the synthetic resin of fusion in the die cavity that is formed between master mold and the male model, and gas-pressurized is injected between the die cavity formation face of the described synthetic resin back side and described male model, so that the surface pressure of synthetic resin is carried out pressurize to the die cavity formation face of described master mold, described Coinjection molding apparatus is characterised in that

Fixing in the embedded merging of the recess that is formed at described male model upper surface nested,

At described nested upper surface, make the protuberance that enters in the described die cavity outstanding, and between the side of the described die cavity of formation of described protuberance and described master mold portion, forming groove.

The 15 invention is a kind of Coinjection molding apparatus, after the described die cavity formation face side to described master mold heats, injection is through the synthetic resin of fusion in the die cavity that is formed between master mold and the male model, and gas-pressurized is injected between the die cavity formation face of the described synthetic resin back side and described male model, so that the surface pressure of synthetic resin is carried out pressurize to the die cavity formation face of described master mold, described Coinjection molding apparatus is characterised in that

Fixing in the embedded merging of the recess that is formed at described male model upper surface nested,

At described nested upper surface, make first protuberance that enters in the described die cavity outstanding, and the upper surface open edge part in the described male model portion that forms described recess makes second protuberance that enters in the described die cavity give prominence in the mode that is higher than described first protuberance

Between described second protuberance and described first protuberance, forming groove.

[effect of invention]

According to the present invention, can eliminate the distortion or the transfer printing inequality of article shaped as much as possible, and molding time is shortened.In addition, even if for having the article shaped of thinner wall section, also can in described thinner wall section, realize the raising of transfer printing.

Description of drawings:

Fig. 1 is the vertical profile front view of Coinjection molding apparatus.

Fig. 2 is the plane of male model portion.

Fig. 3 is the sectional view along the A-A among Fig. 2.

Fig. 4 is the sectional view along the A-A among Fig. 2 under the state of injection behind the synthetic resin.

Fig. 5 is the sectional view along the A-A among Fig. 2 under the packing state.

Fig. 6 is the longitudinal section of the peripheral part bottom surface of die cavity.

Fig. 7 is the longitudinal section of the major part of master mold portion, the first nested and male model portion.

Fig. 8 is the figure in order to explanation moulding action, and is the amplification longitudinal section of the major part of master mold portion, the first nested and male model portion.

Fig. 9 is the longitudinal section of the major part of master mold portion, the second nested and male model portion.

Figure 10 is the longitudinal section of the peripheral part bottom surface of die cavity.

Figure 11 is the longitudinal section of the peripheral part bottom surface of die cavity.

Figure 12 is the longitudinal section of the peripheral part bottom surface of die cavity.

Figure 13 is the longitudinal section of major part of the thin-walled formation portion of master mold portion, male model portion.

Figure 14 is the figure in order to explanation moulding action, and is the amplification longitudinal section of major part of the thin-walled formation portion of master mold portion, male model portion.

Figure 15 is the longitudinal section of the major part of master mold portion, the first nested and male model portion.

Figure 16 is the amplification longitudinal section of the major part of master mold portion, the second nested and male model portion.

Figure 17 is the amplification longitudinal section of the major part of master mold portion, the second nested and male model portion.

Figure 18 is the amplification longitudinal section of the major part of master mold portion, the second nested and male model portion.

Figure 19 is nested plane.

Figure 20 is the sectional view along the B-B among Figure 19 under the state of injection behind the synthetic resin.

Figure 21 is the sectional view along the B-B of Figure 19 under the state that injects behind the gas-pressurized.

Figure 22 is the sectional view along the B-B among Figure 19 under the packing state.

Figure 23 is nested plane.

Figure 24 is the sectional view along the C-C among Figure 23 under the state of injection behind the synthetic resin.

Figure 25 is the sectional view along the C-C of Figure 23 under the state that injects behind the gas-pressurized.

Figure 26 is the sectional view along the C-C among Figure 23 under the packing state.

Figure 27 is the partial enlarged drawing of Figure 26.

Figure 28 is the longitudinal section of article shaped.

[explanation of symbol]

1 fixation side assembly

2 fixation side, first base plate

3 fixation side, second base plate

4 fixation side the 3rd base plate

6 master mold portions

7 locating rings

8 sprue bush

9 cast gates

10 running channels

11 water the road junction

12 hot media channels

20 active side assemblies

21 active side, first base plate

22 active side, second base plate

23 active side the 3rd base plate

24 active side the 4th base plate

26 die matrix

27 male model portions

The 27A order difference part

28A, 28B, 28C, 28D gas injection channel

29A, 29B, 29C, 29D gas passing away

30,31 protuberances

30A, 30B, 30C protuberance

32,33 recesses

34 grooves

34A, 34B, 34C groove

35,35B first is nested

35A thin-walled formation portion

36,37 protuberances

36A, 37A protuberance

38,39 most advanced and sophisticated thin portions

The most advanced and sophisticated thin portion of 38A, 39A

40 second is nested

The 40A fixed part

40B through hole formation portion

41 protuberances

41A, 41B, 41C protuberance

42,42A, 42B top plan

44,44A, 44B protuberance

47 compression storage tanks

48,49,67 flow out flow channel

50 passing aways

53,53A, 53B, 53C, 54,54A, 54B groove

55,56,57,58 protuberances

59A, 59B groove

60 protuberances

61,64 grooves

62,63 protuberances

65,66 is nested

The G gas-pressurized

J synthetic resin

The S die cavity

The SJ article shaped

The U thinner wall section

The X horizontal plane

Z1, Z2 vertical plane

The specific embodiment:

Below with reference to the accompanying drawings, embodiments of the present invention are described.At first, come the integral body formation of Coinjection molding apparatus is described according to Fig. 1.The 1st, utilize screw and be installed in fixation side assembly on the not shown stationary platen (platen), described fixation side assembly 1 comprises: fixation side first base plate 2; Fixation side second base plate 3 utilizes screw and is fixed on described fixation side first base plate 2; Fixation side the 3rd base plate utilizes screw and is fixed on described fixation side second base plate 3; Master mold portion (fixed mould portion) 6 is provided in the recess of described fixation side the 3rd base plate 4 and utilizes screw and be fixed on described fixation side the 3rd base plate 4; Locating ring (locate ring) 7, be arranged on described fixation side first base plate 2 partially by the position of described stationary platen, with respect to stationary platen fixation side first base plate 2 is positioned; And and sprue bush (sprue bush) 8 of setting etc. adjacent with described locating ring 7.

And, in described sprue bush 8, be formed centrally cast gate (sprue) 9, the synthetic resin through fusion that described cast gate 9 usefulness are injected for illustrated injection nozzle never passes through, lower center portion at described sprue bush 8 forms running channel (runner) 10, forms a plurality of road junctions (gate) 11 of watering as the outlet of running channel 10 in addition.And, the 12nd, be formed on hot media channel near the position of the die cavity S of described master mold portion 6 along described die cavity S, make as the heat steam of heat medium or as the cooling water of cooling medium and flow through in the described hot media channel 12, come die cavity to master mold portion 6 to form the face side and heat or cool off.

On the other hand, the 20th, utilize screw and be installed in active side assembly on the not shown movable mold, described active side assembly 20 comprises: active side first base plate 21; Active side second base plate 22 (liftout plate (ejector plate)) utilizes screw and is fixed on described active side first base plate 21; Active side the 3rd base plate 23 utilizes screw and is fixed on described active side first base plate 21 in the mode of surrounding described active side second base plate 22; Active side the 4th base plate 24 utilizes screw and is fixed on described active side the 3rd base plate 23; Die matrix 26 is entrenched in the recess of described active side the 4th base plate 24 and is fixed on described the 4th base plate 24; And be entrenched in the recess of described die matrix 26 and be fixed on the male model portion (flexible mould portion) 27 etc. of the roughly rectangular shape on the described die matrix 26.

And, the upright guide rod (guide rod) (not shown) that is located on described active side the 3rd base plate 23 is inserted in the guide hole that is arranged on fixation side the 3rd base plate 4, described guide rod is directed in the described guide hole and makes active side assembly 20 to move up and down.

Secondly, the plane that is the described male model portion 27 of quadrangle shape under viewed in plan is Fig. 2 and is among Fig. 3 along the sectional view of the A-A among Fig. 2, space by rectangular shape under for example viewed in plan of extending in the horizontal direction, the formed die cavity S in space with for example square tube shape that extends to vertical direction from the peripheral part in described space, make the article shaped moulding of the shape the loam cake (four vertical planes that have rectangular-shaped horizontal plane and hang down from each limit of described horizontal plane) that presents as the casing of upper surface open, forming the continuous profile with preset width in the article shaped rear side is the thinner wall section U of tetragonal frame shape (band shape).The four edges of described thinner wall section U both can all have identical thickness, also can have different thickness separately.

28A, 28B are the gas injection channels, in order in die cavity S, to supply with gas-pressurized (for example nitrogen or air etc.) via supply valve from not shown pressurized-gas source, 29A, 29B are the gas passing aways, in order to the gas-pressurized in Coinjection molding apparatus effluxes out die cavity S via dump valve.

As shown in Figure 6, the aligned portions of described die matrix 26 and male model portion 27 is positioned on the centre position of peripheral part bottom surface of described die cavity S of the vertical plane that forms article shaped, utilizes die matrix 26 and male model portion 27 and forms the peripheral part bottom surface of described die cavity S.And, each upper surface end in die matrix 26 and the aligned portions of male model portion 27 forms the protuberance 30,31 that is tetragonal frame shape (band shape) under viewed in plan, described protuberance 30,31 is given prominence to identical height level upward to enter into the mode in the die cavity S mutually, when the part excision of the outside portion on protuberance 31 tops is made protuberance 30 and 31 docks, seamless joining of bottom and forming groove 34 on top.

Promptly, the protuberance 30 of described die matrix 26 is in such a way and forms: tilt to lower along with advancing laterally after the formation that makes described die matrix 26 each side lifting in order to the recess of chimeric male model portion 27, and drift angle be the roughly rectangular triangle in the longitudinal section about 20～45 degree for example.And, the protuberance 31 of male model portion 27 is to form in such a way: make with till each side of the tangent male model portion 27 in each side of the die matrix 26 that forms described recess is lifted to the height level identical with protuberance 30 after, part excision with the outside portion on protuberance 31 tops, tilt to lower along with advancing to the inside then, and drift angle is the rectangular triangle roughly of the longitudinal section about 20～45 degree for example, when protuberance 30 is docked with protuberance 31, forming on top to have and can not allow the groove 34 of width (for example being the width below the 0.5mm) of the degree that gas-pressurized G enters.

The 32nd, at the formed recess of male model portion 27 upper surfaces, 33 similarly is at the formed recess of male model portion 27 upper surfaces for the bottom surface in article shaped forms outstanding hollow cylindrical portion downwards for the bottom surface in article shaped forms outstanding rib downwards.

Secondly, in Fig. 7,35 is first nested, described first nested be the thin-walled organizator, it is entrenched in male model portion 27 upper surfaces has in the recess that predetermined width and continuous profile are tetragonal frame shape (band shape) and is fixed in the described male model portion 27, described first nested 35 constitutes, this top of first nested 35 enters in the described die cavity S, the longitudinal section, top is upper base and is shorter than the isosceles-trapezium-shaped of going to the bottom, the top plan 42 and the interval between the master mold portion 6 that spread all over the full week on described first nested 35 top and form are shorter than other parts, thus can form as described above on article shaped, have predetermined width and continuous profile is the thinner wall section U of tetragonal frame shape (band shape).

In addition, peripheral part and interior perimembranous at first nested 35 upper surfaces, make the protuberance 36,37 that enters in the die cavity S outstanding, described protuberance 36,37 forms and is tetragonal frame shape (band shape) under the viewed in plan, and, first nested 35 lateral surface and medial surface be lower than after the described top plan 42 so that being raised to, tilt to lower along with advancing to the inside, and drift angle forms for for example roughly rectangular leg-of-mutton mode in longitudinal section about 20～45 degree, and the thin portion 38,39 that tapers off to a point at the top of described protuberance 36,37.Promptly, the hypotenuse portion that forms protuberance 36,37 and longitudinal section are that the height level of bottom surface of the height level of the intersection point portion between first nested 35 the hypotenuse portion of isosceles-trapezium-shaped and formation die cavity S is identical, two hypotenuse portion angulations are about 90 degree and roughly meet at right angles, and form the good most advanced and sophisticated thin portion 38,39 of heat conductivity at the top of described protuberance 36,37.

Secondly, in Fig. 9,40 is second nested, described second nested be the opening organizator that is entrenched in the recess of described male model portion 27 upper surfaces and is fixed on the roughly rectangular shape in the described male model portion 27, in order on article shaped, to form through hole, under the state that is anchored on the mould, the upper end abuts to described master mold portion 6.Promptly, described second nested 40 possesses fixed part 40A and the through hole formation 40B of portion, described fixed part 40A is entrenched in the recess of described male model portion 27 upper surfaces and has the bigger area of plane, be arranged on the top of described fixed part 40A between described through hole formation 40B of portion and described fixed part 40A across jump, in order on article shaped, to form through hole, has the less area of plane, and upper surface abuts to described master mold portion 6, peripheral end at second nested 40 upper surfaces, it is the peripheral end of the described through hole formation 40B of portion upper surface, make protuberance 41 outstanding, described protuberance 41 is so that each lateral surface lifting of second nested 40 and enter into the mode in the die cavity S and form has short width.

In addition, under described second nested 40 state that is entrenched in the recess of male model portion 27 upper surfaces, the mode that forms groove 53 to be separated by small interval with described protuberance 41 to surround described protuberance 41 from the outside, in this way with protuberance 44 upright male model portion 27 upper surfaces that are located at.At this moment, described second nested 40 protuberance 41 has identical height level with the protuberance 44 of male model portion 27, the width of formed opening forms the degree of depth that is shallower than die cavity S slightly for not allowing the degree of depth of groove 54 of width (for example being the following width of 0.5mm) of the degree that gas-pressurized G enters between the two.And described second nested 40 protuberance 41 forms with the protuberance 44 of male model portion 27 and is tetragonal frame shape (band shape) under the viewed in plan.

In addition, in Fig. 1 and Fig. 3, the 48th, with first nested 35 with male model portion 27 between slit and a plurality of outflow flow channels of being communicated with storage tank 47 of compression, the 49th, with second nested 40 with male model portion 27 between slit and the outflow flow channel 49 that is communicated with storage tank 47 of compression, described compression is to be connected with the Coinjection molding apparatus outside via the passing away 50 that is setting dump valve with storage tank 47.

More than utilizing, constitute when carrying out injection moulding, at first, in the hot media channel 12 of master mold portion 6, supply with heat steam as thermal medium, coming that the die cavity of master mold portion 6 is formed the face side heats and makes it to begin and heat up, reach the scope interior predetermined temperature corresponding 80～200 ℃ so that described die cavity forms the face side, make fixation side assembly 1 and active side assembly 20 carry out mold closing (referring to Fig. 3) then with the kind that is expelled to the synthetic resin in the described die cavity S.Carry out the situation of mold closing after being not limited to begin as mentioned above to heat up, also can when beginning to heat up, carry out mold closing or behind mold closing, begin heating up.

Then, after the die cavity formation face side of master mold portion 6 reaches described predetermined temperature, stop the supply of steam and stop intensification, and injection nozzle passed sprue bush 8, will be expelled in the die cavity S between described male model portion 27 and the master mold portion 6 from watering road junction 11 via cast gate 9 through the synthetic resin J of fusion.At this moment, inject the 80 volume % of spatial volume of this die cavity S above and 98 volume % are following, for example about about 90 volume % through the synthetic resin J of fusion (referring to Fig. 4).

Then, after the injection through the synthetic resin J of fusion about about 90 volume % finishes, the gas-pressurized G about about 10 volume % of the spatial volume of die cavity S is supplied in the die cavity S from pressurized-gas source via supply valve and gas injection channel 28A, 28B.Described gas-pressurized G is injected between the die cavity formation face of the synthetic resin J back side of fusion and male model portion 27, thus, will carries out pressurize (referring to Fig. 5) to the die cavity formation face of master mold portion 6 through the surface pressure of the synthetic resin J of fusion.Thus, can be suppressed on the surface of article shaped and produce indenture, and transfer printing is improved, thereby solve the not good enough problem of outward appearance as much as possible.

Then, when injecting described gas-pressurized G, that is, side by side begin in the hot media channel 12 of master mold portion 6, to supply with cooling water before being about to injection or after just having injected or with injection, harden so that the die cavity of the master mold portion 6 of synthetic resin J forms the face side.Then, utilize described gas-pressurized G to carry out pressurize on one side, make on one side the surface cool of synthetic resin J, when synthetic resin J hardens to a certain degree, for example stops described injection after the neat in shape degree, and the gas-pressurized G in Coinjection molding apparatus effluxes out die cavity S.When described gas-pressurized is discharged end outside Coinjection molding apparatus after, the substitute is between the die cavity formation face of the synthetic resin back side and male model portion 27 and inject cold air via gas injection channel 28A, 28B.That is, than the cooling of synthetic resin surface (die cavity of master mold portion 6 forms the face side) a little later, and come the synthetic resin back side (the die cavity formation face side of male model portion 27) cooled off with the temperature or the low slightly temperature that equate with this chilling temperature.

Therefore, when the synthetic resin back side not being cooled off,, on article shaped, produce warpage sometimes because the caused shrinkage factor of temperature difference of face side and rear side is different, but then can shorten molding time by described cooling, and can solve the problem of the warpage of article shaped.In addition, the purpose that the back temperature of synthetic resin J is cooled to be lower than slightly surface temperature is, prevent article shaped generation distortion because of knock pin (ejector pin) when the demoulding, and the purpose that is cooled to equal temperature is, further shortens molding time after the problem that has solved the distortion that produces because of knock pin.

And, when curable synthetic resin to being enough to after the degree that die cavity S takes out, stop in die cavity S, injecting cold air, and stop in the hot media channel 12 of master mold portion 6, to supply with cooling water, open mould then, utilize knock pin to make the article shaped demoulding, then as mentioned above, prepare the production of next article shaped once more.

In addition, when gas-pressurized G being injected between the die cavity formation face of the synthetic resin J of fusion and male model portion 27, and will be when the die cavity formation face of master mold portion 6 carries out pressurize through the surface pressure of the synthetic resin J of fusion, must make through the synthetic resin J of fusion and spread all over each corner in the die cavity S, and, make transfer printing good with through the density of the synthetic resin J of fusion mode and spreading all over uniformly all anywhere.Therefore, below to describing in order to the specific embodiment of reaching above-mentioned purpose.

At first, according to Fig. 6, be that the moulding action of the peripheral part bottom surface of die cavity S describes to the place that is difficult to arrive with equal densities at synthetic resin J through fusion.Promptly, utilize die matrix 26 and male model portion 27 to form the peripheral part bottom surface of described die cavity S, the aligned portions of described die matrix 26 and male model portion 27 is positioned on the centre position of peripheral part bottom surface of die cavity S of the vertical plane that forms article shaped, therefore when the gas-pressurized G that incites somebody to action amount to a certain degree is injected in the die cavity S via gas injection channel 28A, 28B, become the state shown in Fig. 6 (A), and when further injecting gas-pressurized G, be that die matrix 26 is advanced with the aligned portions of male model portion 27 towards the terminal part of die cavity S further through the synthetic resin J of fusion general.

At this moment, be accompanied by through the surface of the synthetic resin J of fusion and move and hardening a little, the synthetic resin J of front end supports the protuberance 30,31 (referring to Fig. 6 (B)) that hits die matrix 26 and male model portion 27, synthetic resin J enters into has the part that can not allow in the groove 34 of width (for example being the following width of 0.5mm) of the degree that gas-pressurized G enters, and the harder skin breakage of described synthetic resin J and making outside soft part is exposed to.Soon, the terminal part that spreads all over die cavity S through the synthetic resin J of fusion is a die matrix 26 and the aligned portions of male model portion 27.Promptly, the synthetic resin J through fusion that is exposed to outer softness all enters in the groove 34, therefore can prevent gas-pressurized around go into to master mold portion 6 in or from the slit between master mold portion 6 and the die matrix 26 to the Coinjection molding apparatus external leaks, thereby can utilize gas-pressurized with the surface pressure of synthetic resin to the die cavity formation face of master mold portion 6 and fully carry out pressurize (referring to Fig. 6 (C)).

In addition, utilize described groove 34 and on article shaped, form thin rib, but described rib can not be projected into outside the article shaped profile, so, do not having problems aspect function aspects and the outward appearance as article shaped.

Secondly, according to Fig. 7 and Fig. 8, to the i.e. moulding action of first nested 35 periphery describes in the place that is difficult to arrive with equal densities through the synthetic resin J of fusion.At first, when gas-pressurized G is injected in the die cavity S via gas injection channel 28A, 28B, with will be when the die cavity formation face of master mold portion 6 carries out pressurize through the surface pressure of the synthetic resin J of fusion, shown in Fig. 8 (A), gas-pressurized G is in the mode of the side that abuts to first nested 35 protuberance 36,37 and arrive.

When further injection gas-pressurized G, described gas-pressurized G can rise and arrive the most advanced and sophisticated thin portion 38,39 (referring to Fig. 8 (B)) of described protuberance 36,37, soon just cross the thin portion 38,39 in described tip (referring to Fig. 8 (C)), arrive then protuberance 36,37 rake low root and a part of gas-pressurized G is arrived in first nested 35 the hypotenuse portion (referring to Fig. 8 (E)), also can produce the part (referring to Fig. 8 (D)) of the gas-pressurized G in the hypotenuse portion of no show still first nested 35.At this moment, utilization is carried out accumulation of heat through the heat of the synthetic resin J of fusion in the thin portion 38,39 in described tip.

Then, at last, the synthetic J of anti-fat becomes soft under the effect of the thin portion 38,39 in the tip of accumulation of heat, gas-pressurized G crosses protuberance 36,37 and along accumulating portion and move by the hypotenuse portion of the hypotenuse portion of protuberance 36,37 and first nested 35 being formed, makes gas-pressurized G arrive described whole zone (referring to Fig. 8 (F)) of accumulating portion thus.Therefore, because protuberance 36, the hypotenuse portion angulation of 37 hypotenuse portion nested with first 35 is about the right angle, so arriving the described gas-pressurized G that accumulates portion can pressurize in the mode of the resin J that slippages in first nested 35 hypotenuse portion, thereby also can under the state that is a mass of synthetic resin J with equal densities, fully pressurize (among Fig. 7 to the part that (narrower) lacked at first nested 35 top plan 42 and the interval between the master mold portion 6, represent compression aspect with arrow), even if under the situation that forms thinner wall section U on the article shaped, also can prevent the uneven or distortion of transfer printing.

At this moment, the part that forms side for the die cavity that to utilizing gas-pressurized G synthetic resin J is not pressurized to master mold portion 6 is carried out the pressurization more than the required degree, via small slit between the male model portion 27 nested with first 35 and outflow flow channel 48, and the gas-pressurized G in the die cavity S is collected compression with in the storage tank 47.On the other hand, be collected in described compression with the gas-pressurized in the storage tank 47 via described slit and flow out flow channel 48 and supply in the die cavity S, so that described gas-pressurized also spreads all over the part that can't fully pressurize.Thus, gas-pressurized can not rise rapidly along first nested 35 hypotenuse portion, but spread all over article shaped thinner wall section U full week and form uniform density, thereby can make article shaped be shaped to shape according to the mould former state.

Secondly, in the mode that the surface pressure of synthetic resin J is carried out pressurize to the die cavity formation face of master mold portion 6, gas-pressurized is injected in the die cavity S via gas injection channel 28A, 28B, even if in article shaped, forming under the situation of through hole, also can tackle reliably, below be explained according to Fig. 9.

Promptly, as shown in Figure 9, in die cavity S, inject through the synthetic resin J of fusion pressurization by gas-pressurized, and cross the protuberance 44 of male model portion 27 upper surfaces, arrive by in protuberance 41 and the described protuberance 44 formed grooves 54 and further arrival and form in 40B of portion and the protuberance 41 formed grooves 53 by second nested 40 through hole.

At this moment, the part that forms side for the die cavity that to utilizing gas-pressurized G synthetic resin J is not pressurized to master mold portion 6 is carried out the pressurization more than the required degree, via small slit between the male model portion 27 nested with second 40 and outflow flow channel 49, and the gas-pressurized G in the die cavity S is collected compression with in the storage tank 47.On the other hand, be collected in described compression with the gas-pressurized in the storage tank 47 via described slit and flow out flow channel 48 and supply in the die cavity S, so that described gas-pressurized also spreads all over the part that can't fully pressurize.

Like this, by compression with the effect of storage tank 47 or make synthetic resin enter into described groove 53,54, and being suspended, gas-pressurized G flows, and carry out pressurize by the volume that makes gas-pressurized G flow into other parts in large area to increase the gas-pressurized G in the die cavity S, can improve the density of through hole (peristome) synthetic resin on every side of article shaped thus.And, described through hole (peristome) is pushed on every side and pressure is raise, in addition, utilize the lowered male model of temperature portion 27 and the temperature of synthetic resin is reduced.Therefore, synthetic resin hardens, and rises and rapidly around going in master mold portion 6 in the side that can prevent the through hole formation 40B of portion of gas-pressurized G along second nested 40.

In addition, as described according to Fig. 6, constitute as follows: the peripheral part bottom surface that forms described die cavity S by die matrix 26 and male model portion 27, the aligned portions of die matrix 26 and male model portion 27 form mutually in die cavity S above outstanding protuberance 30,31, when protuberance 30 being docked with protuberance 31 when the part of the outside portion on excision protuberance 31 tops, the bottom becomes seamless joining and forms groove 34 on top, but be not limited to this, also can be set as other embodiment to structure shown in Figure 12 as Figure 10.

Promptly, as shown in figure 10, upper surface in the close male model portion 27 of described die matrix 26, the outstanding drift angle in the top of formation in die cavity S be the protuberance 30A of rectangular triangle roughly of the longitudinal section about 20～45 degree for example, promptly, protuberance 30A be so that with each side lifting of the tangent die matrix 26 in each side of male model portion 27, tilt to lower along with advancing laterally then, and the roughly rectangular leg-of-mutton mode in longitudinal section forms, and excise the part (forming order difference part 27A) of the outside portion of male model portion 27 from the height level identical with the bottom surface of die cavity S, and between male model portion 27 and described protuberance 30A, form groove 34A, described groove 34A constitutes the part of die cavity S, and has and can not allow the width (for example being the following width of 0.5mm) of the degree that gas-pressurized G enters.In addition, described protuberance 30A, 31A form and are tetragonal frame shape (band shape) under the viewed in plan.

Therefore, can enter in the groove 34A through the synthetic resin J of fusion, so can prevent that gas-pressurized is around going in master mold portion 6, and can prevent that gas-pressurized from flowing out from the slit between die matrix 26 and the master mold portion 6, thereby can utilize gas-pressurized and the surface pressure of synthetic resin is carried out abundant pressurize to the die cavity formation face of master mold portion 6, and the synthetic resin J through fusion was hardened in the pressurized time.

And, as shown in figure 11, on the position of the close male model portion 27 of die matrix 26, outstanding longitudinal section, the top of formation in die cavity S is the protuberance 30B of rectangular shape, promptly, make with each side lifting of the tangent die matrix 26 in each side of male model portion 27 and form the protuberance 30B that the longitudinal section is a rectangular shape, excise the part (forming order difference part 27A) of the outside portion of male model portion 27 from the height level identical with the bottom surface of die cavity S, and between male model portion 27 and described protuberance 30B, form groove 34B, described groove 34B constitutes the part of die cavity S, and has and can not allow the width (for example being the following width of 0.5mm) of the degree that gas-pressurized G enters.In addition, described protuberance 30B forms and is tetragonal frame shape (band shape) under the viewed in plan.

Therefore, can enter in the groove 34B through the synthetic resin J of fusion, so can prevent that gas-pressurized is around going in master mold portion 6, and can prevent that gas-pressurized from flowing out from the slit between die matrix 26 and the master mold portion 6, thereby can utilize gas-pressurized and the surface pressure of synthetic resin J is carried out abundant pressurize to the die cavity formation face of master mold portion 6, and the synthetic resin J through fusion was hardened in the pressurized time.

In addition, as shown in figure 12, on the position of the close male model portion 27 of die matrix 26, form protuberance 30C, in the described protuberance 30, outstanding longitudinal section, top in die cavity S is roughly rectangular shape, and will round away from the bight of male model portion 27, promptly, make with each side lifting of the tangent die matrix 26 in each side of male model portion 27 and form protuberance 30C, excise the part (forming order difference part 27A) of the outside portion of male model portion 27 from the height level identical with the bottom surface of die cavity S, and between male model portion 27 and described protuberance 30C, form groove 34C, described groove 34C constitutes the part of die cavity S, and has and can not allow the width (for example being the following width of 0.5mm) of the degree that gas-pressurized G enters.In addition, described protuberance 30C forms and is tetragonal frame shape (band shape) under the viewed in plan.

Therefore, can enter in the groove 34C through the synthetic resin J of fusion, so can prevent that gas-pressurized is around going into to master mold portion 6, and can prevent that gas-pressurized from flowing out from the slit between die matrix 26 and the master mold portion 6, thereby can utilize gas-pressurized and the surface pressure of synthetic resin J is carried out abundant pressurize to the die cavity formation face of master mold portion 6, and the synthetic resin J through fusion was hardened in the pressurized time.

In addition, under the situation that is article shaped SJ as shown in figure 28, promptly, article shaped SJ possesses horizontal plane X and continuous the vertical plane Z1 that is communicated with in vertical direction with the peripheral part of described horizontal plane X, possesses continuous the cylinder that is communicated with in vertical direction at the lower surface of described horizontal plane X and horizontal plane X or the vertical plane Z2 of square tube shape in addition, perhaps ought make under the situation of the article shaped moulding that possesses horizontal plane X and vertical plane Z2 and do not possess vertical plane Z1, can certainly use as Fig. 6 or Figure 10 to technological thought shown in Figure 12.Promptly, be not limited to by the space of extension in the horizontal direction and the formed die cavity in space of the tubular of extension in vertical direction that is being communicated with described space peripheral part, and so long as by the space of extension in the horizontal direction and the formed die cavity in space of the tubular of extension in vertical direction that is being communicated with described space, even if possess the die cavity in the space of the tubular that extends in vertical direction that on the centre position of the peripheral part in the space that no show is extended in the horizontal direction, is being communicated with, also can use above-mentioned technological thought.

And, when forming on the article shaped under the situation of thinner wall section U, as Fig. 7 and shown in Figure 8, be entrenched in the recess that is formed at male model portion 27 upper surfaces and make first nested 35 to be fixed in the described male model portion 27 first nested 35, but be not limited to this, can not cut apart like this, but constitute, can in male model portion 27, form the thin-walled formation 35A of portion yet and replace first nested 35 with Construction integration as shown in figure 13.

Below, according to Figure 13 and Figure 14, the embodiment that forms the described thin-walled formation 35A of portion in male model portion 27 is described.At first, 35A is the thin-walled formation portion that forms continuously on male model portion 27 upper surfaces, the described thin-walled formation 35A of portion constitutes: the longitudinal section is upper base and is shorter than the isosceles-trapezium-shaped of going to the bottom, spread all over the described thin-walled formation 35A of portion top full week and the top plan 42A and the interval between the master mold portion 6 that form are shorter than other parts, can on article shaped, form thinner wall section U.

In addition, peripheral part and interior perimembranous at the thin-walled formation 35A of portion, make the protuberance 36A, the 37A that enter in the die cavity S outstanding, described protuberance 36A, 37A form and are tetragonal frame shape (band shape) under the viewed in plan, and after being raised to the position that is lower than described top plan 42A, tilt to lower along with advancing to the inside mutually, and drift angle forms for for example roughly rectangular leg-of-mutton mode in longitudinal section about 20～45 degree, and taper off to a point at the top of described protuberance 36A, the 37A thin 38A of portion, 39A.Promptly, the height level of the intersection point portion between the hypotenuse portion of formation protuberance 36A, the hypotenuse portion of 37A and the thin-walled formation 35A of portion that the longitudinal section is isosceles-trapezium-shaped, identical with the height level of the bottom surface that forms die cavity S, two hypotenuse portion angulations are about 90 degree and roughly rectangular, form the heat conductivity good most advanced and sophisticated thin 38A of portion, 39A at the top of described protuberance 36A, 37A.

And, when mode carrying out pressurize to the die cavity formation face of master mold portion 6 through the surface pressure of the synthetic resin J of fusion, and when being injected into die cavity S in via gas injection channel 28A, 28B gas-pressurized G, shown in Figure 14 (A), gas-pressurized G is in the mode of the side of the protuberance 36A, the 37A that abut to the thin-walled formation 35A of portion and arrive.

And then, after injecting gas-pressurized G, gas-pressurized G can rise and arrive the most advanced and sophisticated thin 38A of portion, the 39A (referring to Figure 14 (B)) of described protuberance 36A, 37A, soon just cross the thin 38A of portion in described tip, 39A (referring to Figure 14 (C)), arrive the lower root of rake of protuberance 36A, 37A then and a part of gas-pressurized G is arrived in the hypotenuse portion of the thin-walled formation 35A of portion (referring to Figure 14 (E)), also can produce the part (referring to Figure 14 (D)) of the gas-pressurized G in the hypotenuse portion of the no show thin-walled formation 35A of portion still.At this moment, utilization is carried out accumulation of heat through the heat of the synthetic resin J of fusion on the thin 38A of portion in described tip, 39A.

Then, at last, owing to making synthetic resin J, the tip of the accumulation of heat thin 38A of portion, 39A become soft, after gas-pressurized G crosses protuberance 36A, 37A, gas-pressurized G accumulates portion and moves along the hypotenuse portion that hypotenuse portion and thin-walled by protuberance 36A, 37A form the 35A of portion is formed, so gas-pressurized arrives described whole zone (referring to Figure 14 (F)) of accumulating portion.

Therefore, because protuberance 36A, the hypotenuse portion angulation of the hypotenuse portion of 37A and the thin-walled formation 35A of portion is about the right angle, so arriving the described gas-pressurized G that accumulates portion can pressurize to push away in the hypotenuse portion of the thin-walled formation 35A of portion through the mode of the synthetic resin J of fusion, thereby also the part that can lack (narrower) to top plan 42A and the interval between the master mold portion 6 of the thin-walled formation 35A of portion is fully pressurizeed (among Figure 13 being a mass of under the state of the synthetic resin J of fusion, represent compression aspect with arrow), even if form under the situation of thinner wall section U that continuous the profile with predetermined width is a tetragonal frame shape (band shape) in the article shaped rear side, also can prevent the uneven or distortion of transfer printing.Four limits of described thinner wall section U both can all have identical thickness, also can have different thickness separately.

In addition, forming on the article shaped under the situation of thinner wall section U, as Fig. 7 and shown in Figure 8, be entrenched in the recess that is formed on male model portion 27 upper surfaces and make first nested 35 to be fixed in the described male model portion 27 first nested 35, identical therewith, also can as shown in figure 15 the first nested 35B be entrenched in the recess that is formed on male model portion 27 upper surfaces and the first nested 35B is fixed in the described male model portion 27, below be explained.

Promptly, among Figure 15,35B is embedded in to be fixed on first nested in the described male model portion 27 in the recess that continuous the profile that has predetermined width on male model portion 27 upper surfaces is a tetragonal frame shape (band shape), the described first nested 35B constitutes: the longitudinal section, top is upper base and is shorter than the isosceles-trapezium-shaped of going to the bottom, spread all over the described first nested 35B top full week and the top plan 42B and the interval between the master mold portion 6 that form are shorter than other parts, can form continuous the profile with predetermined width in the article shaped rear side is the thinner wall section U of tetragonal frame shape (band shape).The four edges of described thinner wall section U both can all have identical thickness, also can have different thickness separately.

In addition, the lower end height level of hypotenuse portion that top is the first nested 35B of isosceles-trapezium-shaped is positioned at height level's the top position of the bottom surface of die cavity S, on the outside of the periphery of the described first nested 35B and male model portion 27 tops of the inboard in interior week, make protuberance 55,56 is outstanding, described protuberance 55,56 enter in the die cavity S and the longitudinal section is upper base and is shorter than the trapezoidal shape of going to the bottom (if hypotenuse is prolonged, then drift angle is the rectangular triangle roughly of the longitudinal section about 20～45 degree for example), and described protuberance 55,56 with the described first nested 35B between exist to have and can not allow interval (the groove 59A of width (for example being the following width of 0.5mm) of the degree that gas-pressurized G enters, 59B).That is, described protuberance 55,56 is formed near described male model 27 upper surfaces that are positioned at the first nested 3SB.

And then, forming protuberance 57,58, described formation protuberance 57,58 is respectively and form between the protuberance 55,56 that is tetragonal frame shape (band shape) under the viewed in plan and exist small interval.Entering into protuberance 57,58 in the die cavity S forms and is tetragonal frame shape (band shape) under the viewed in plan, drift angle be for example 20～45 the degree about the rectangular triangle in longitudinal section, tilt to lower along with advancing to the first nested 35B direction after the vertical upward lifting, the hypotenuse portion angulation of the hypotenuse portion of described protuberance 57,58 and protuberance 55,56 is about 90 degree and roughly meets at right angles.In addition, the bottom surface that is formed at groove 59A, 59B between protuberance 55,56 and the described first nested 35B is positioned on the position of the level higher than die cavity S bottom surface.

And, when in order to carry out pressurize to the die cavity formation face of master mold portion 6 through the surface pressure of the synthetic resin J of fusion, and when being injected into die cavity S in via gas injection channel 28A, 28B gas-pressurized, at first, make gas-pressurized in the mode of the vertical side that abuts to protuberance 57,58 and arrive.And then, after injecting this gas-pressurized, described gas-pressurized can rise and arrive the upper end of described protuberance 57,58, just crosses the upper end of described protuberance 57,58 soon and arrives the lower root of hypotenuse portion of protuberance 55,56, and then arrive in the hypotenuse portion of protuberance 55,56.

At this moment, because protuberance 55,56 hypotenuse portion and protuberance 57,58 hypotenuse portion angulation is about the right angle, so arrive described protuberance 55, gas-pressurized in 56 the hypotenuse portion can with to protuberance 55, the direction of 56 hypotenuse portion quadrature and with protuberance 57, the direction pressing mode of 58 hypotenuse portion quadrature and play a role (referring to the arrow of Figure 15), the result, gas-pressurized can be with along protuberance 55, push away in 56 hypotenuse portion and the hypotenuse portion of the first nested 35B through the mode of the synthetic resin J of fusion and pressurize, thereby also the part that can lack (narrower) to top plan 42B and the interval between the master mold portion 6 of the first nested 35B is fully pressurizeed being a mass of under the state of the synthetic resin J of fusion, even if also can prevent the uneven or distortion of transfer printing under the situation that forms thinner wall section on the article shaped.

In addition, as mentioned above, forming on the article shaped under the situation of thinner wall section, use is as first nested 35, the thin-walled formation 35A of portion that is formed on male model portion 27 of thin-walled organizator, as the first nested 35B of thin-walled organizator, and form continuous the profile with predetermined width in the rear side of article shaped is the thinner wall section of tetragonal frame shape (band shape), but being not limited to described shape, also can be H shape, cross shape or other shape that does not connect into the frame shape.And then the thinner wall section that is formed on the described article shaped both can all have identical thickness, also can have different thickness separately by every straight line.

In addition, be not limited to the shape of second nested 40 protuberance 41 as shown in Figure 9 and the shape that is formed on the protuberance 44 in the male model portion 27, can be set as the embodiment to shape shown in Figure 180 as Figure 16.

At first, as shown in figure 16, the peripheral part of the fixed part 40A upper surface second nested 40 makes protuberance 41A outstanding, and between through hole formation 40B of portion and described protuberance 41A, form groove 53A, described protuberance 41A forms, make after each side lifting along with tilting and enter in the die cavity S to lower, and drift angle be the roughly rectangular triangle in the longitudinal section about 20～45 degree for example near the through hole formation 40B of portion.And, the protuberance 44A that forms to surround the mode of described protuberance 41A from the outside forms, make form second nested 40 after each side lifting of male model portion 27 of chimeric recess, tilt to lower along with advancing laterally, and drift angle be the roughly rectangular triangle in the longitudinal section about 20～45 degree for example.

And, each upper surface end of the fixed part 40A second nested 40 and the aligned portions of male model portion 27, form the protuberance 41A and the protuberance 44A that are tetragonal frame shape (band shape) under the viewed in plan, described protuberance 41A and protuberance 44A are projected into identical height level upward to enter into the mode in the die cavity S mutually, after the part excision of the outside portion on protuberance 44A top being made second nested 40 fixed part 40A and male model portion 27 docks, the bottom becomes seamless joining, and can not allow the groove 54A of width (for example being the width below the 0.5mm) of the degree that gas-pressurized G enters and form on top to have.At this moment, the degree of depth by the formed groove 54A of protuberance 44A of described second nested 40 protuberance 41A and male model portion 27 forms the degree of depth that is shallower than die cavity S slightly.

And, gas-pressurized is injected in the die cavity S via gas injection channel 28A, 28B and when on article shaped, forming through hole, cross the protuberance 44A of male model portion 27 upper surfaces through the synthetic resin J of fusion by the pressurization of gas-pressurized, arrive by in described protuberance 44A and the formed groove 54A of described protuberance 41A or the through hole that arrives by second nested 40 form in 40B of portion and the formed groove 53A of protuberance 41A.

At this moment, the part that forms side for the die cavity that to utilizing gas-pressurized G synthetic resin J is not pressurized to master mold portion 6 is carried out the pressurization more than the required degree, via small slit between the male model portion 27 nested with second 40 and outflow flow channel 49, and the gas-pressurized G in the die cavity S is collected compression with in the storage tank 47.On the other hand, be collected in described compression with the gas-pressurized in the storage tank 47 via described slit and flow out flow channel 49 and supply in the die cavity S, so that described gas-pressurized also spreads all over the part that can't fully pressurize.

Like this, by compression with the effect of storage tank 47 or synthetic resin is entered in described groove 53A, the 54A, and being suspended, gas-pressurized G flows, and carry out pressurize by the volume that makes gas-pressurized G flow into other parts in large area to increase the gas-pressurized G in the die cavity S, can improve the density of through hole (peristome) synthetic resin on every side of article shaped thus.And, described through hole (peristome) is pushed on every side and pressure is raise, and utilize the lowered male model of temperature portion 27 and the temperature of synthetic resin is reduced.Therefore, synthetic resin can harden, and rises and rapidly around going into to master mold portion 6 in the side that can prevent the through hole formation 40B of portion of gas-pressurized G along second nested 40.

And, as shown in figure 17, the peripheral part of the fixed part 40A upper surface second nested 40 makes protuberance 41B outstanding, and between through hole formation 40B of portion and described protuberance 41B, form groove 53B, described protuberance 41B forms and makes each side lifting, be lowered in the die cavity S along with the close through hole formation 40B of portion then, and the longitudinal section is a circular shape.And the protuberance 44B that forms to surround the mode of described protuberance 41B from the outside forms, make form second nested 40 reduce along with advancing laterally after each side lifting of male model portion 27 of chimeric recess, and the longitudinal section is circular shape.

And, each upper surface end of the fixed part 40A second nested 40 and the aligned portions of male model portion 27, form the protuberance 41B and the protuberance 44B that are tetragonal frame shape (band shape) under the viewed in plan, described protuberance 41B and protuberance 44B are projected into identical height level upward to enter into the mode in the die cavity S mutually, when the fixed part 40A that the part excision of the outside portion on protuberance 44B top is made second nested 40 docks with male model portion 27, the bottom becomes seamless joining, and can not allow the groove 54B of width (for example being the width below the 0.5mm) of the degree that gas-pressurized G enters and form on top to have.At this moment, the degree of depth by the formed groove 54B of protuberance 44B of described second nested 40 protuberance 41B and male model portion 27 forms the degree of depth that is shallower than die cavity S slightly.

Then, gas-pressurized is injected in the die cavity S via gas injection channel 28A, 28B and when on article shaped, forming through hole, cross the protuberance 44B of male model portion 27 upper surfaces through the synthetic resin J of fusion by the pressurization of gas-pressurized, arrive by in described protuberance 44B and the formed groove 5BA of described protuberance 41B or arrival form in 40B of portion and the formed groove 53B of protuberance 41B by second nested 40 through hole.

At this moment, the part that forms side for the die cavity that to utilizing gas-pressurized G synthetic resin J is not pressurized to master mold portion 6 is carried out the pressurization more than the required degree, via small slit between the male model portion 27 nested with second 40 and outflow flow channel 49, and the gas-pressurized G in the die cavity S is collected compression with in the storage tank 47.On the other hand, be collected in described compression with the gas-pressurized in the storage tank 47 via described slit and flow out flow channel 49 and supply in the die cavity S, so that described gas-pressurized also spreads all over the part that can't fully pressurize.

As mentioned above, by compression with the effect of storage tank 47 or make synthetic resin enter into described groove 53B, 54B that gas-pressurized G is suspended is mobile, and carry out pressurize by the volume that makes gas-pressurized G flow into other parts in large area to increase the gas-pressurized G in the die cavity S, can improve the density of through hole (peristome) synthetic resin on every side of article shaped thus.And, described through hole (peristome) is pushed on every side and pressure is raise, and utilize the lowered male model of temperature portion 27 and the temperature of synthetic resin is reduced.Therefore, synthetic resin can harden, and rises and rapidly around going into to master mold portion 6 in the side that can prevent the through hole formation 40B of portion of gas-pressurized G along second nested 40.

And then, as shown in figure 18, the peripheral part of fixed part 40A upper surface second nested 40, make protuberance 41C outstanding, and at the through hole formation 40B of portion and form between the described protuberance 41C that is tetragonal frame shape (band shape) under the viewed in plan and to form groove 53C, described protuberance 41C forms and makes each side lifting, and then along with tilting and enter in the die cavity S to lower near the through hole formation 40B of portion, and drift angle be the roughly rectangular triangle in the longitudinal section about 20～45 degree for example.

And, gas-pressurized is injected in the die cavity S via gas injection channel 28A, 28B and when on article shaped, forming through hole, abut to second nested 40 protuberance 41C through the synthetic resin J of the fusion pressurization by gas-pressurized, thereby can prevent that gas-pressurized is around going into to master mold portion 6.

Promptly, especially under the situation far away of being separated by as second nested 40 and gas injection channel 28A, 28B of through hole organizator, if the volume increase of the gas-pressurized G in the die cavity S make synthetic resin J increase in density and can be expressed to second nested 40 around the time, then need not in male model portion 27, protuberance be set, only utilize second nested 40 protuberance 41C can prevent that just gas-pressurized is around going into to master mold portion 6.

But, as mentioned above, the part that forms side for the die cavity that to utilizing gas-pressurized G synthetic resin J is not pressurized to master mold portion 6 is carried out the pressurization more than the required degree, must be by the small slit between the male model portion 27 nested with second 40, and the gas-pressurized G in the die cavity S is collected compression with in the storage tank 47, on the other hand, supply in the die cavity S by described slit with the gas-pressurized in the storage tank 47 being collected in described compression, so that described gas-pressurized G also spreads all over the part that can't fully pressurize.

In addition, in the above embodiment, illustration make die cavity S present the moulding of the article shaped of the shape the loam cake (four vertical planes that have rectangular-shaped horizontal plane and hang down) as casing from each limit of described horizontal plane, following according to Figure 19 to Figure 22, the embodiment of the moulding situation of the article shaped that makes writing board shape is described.At first, nested 65 of rectangular shape roughly is entrenched in the recess that is formed in the male model portion 27, to be fixed on described male model portion 27 with nested 65, utilize master mold portion 6, nested 65 and male model portion 27 form die cavity S.And nested 65 upper surface is slightly smaller than the bottom surface of die cavity S, that is, utilize the described recess edge of opening position and nested 65 of male model portion 27 upper surfaces to form the bottom surface of die cavity S.In addition, peripheral part at described nested 65 upper surface makes protuberance 60 outstanding, and between described master mold portion 6 and protuberance 60, form to have and can not allow the groove 61 of width (for example being the width below the 0.5mm) of the degree that gas-pressurized G enters, described protuberance 60 forms and makes each side lifting, then along with near inboard and tilt and enter in the die cavity S to lower, and drift angle is the rectangular triangle roughly of the longitudinal section about 20～45 degree for example, and described protuberance 60 forms and is tetragonal frame shape (band shape) under the viewed in plan.

In addition, as mentioned above, not necessarily need described protuberance 60 is set as in the whole peripheral part that spreads all over nested 65 upper surface or the whole zone between described protuberance 60 and master mold portion 6 and form groove 61, described protuberance or groove are so long as be arranged on the part of peripheral part of horizontal component that gas-pressurized is difficult for the article shaped that arrives to prevent that gas-pressurized is around going into to master mold portion 6 surfaces to get final product.In other words, may be as long as be arranged on gas-pressurized around going into the part (zone) that leaks into the Coinjection molding apparatus outside to master mold portion 6 surfaces.

And, a certain amount of after the synthetic resin J of fusion (referring to Figure 20) when at first in described die cavity S, injecting, when in die cavity S, supplying with the gas-pressurized from pressurized-gas source via supply valve and gas injection channel 28C, in being expelled to die cavity S can formation gas-pressurized layer (referring to Figure 21) between the synthetic resin J of fusion is with nested 65.

In addition, when injecting this gas-pressurized, can arrive the edge part of die cavity S, and cross the hypotenuse portion of protuberance 60 and enter in the groove 61 through the synthetic resin J of fusion.Therefore, utilize the synthetic resin J that enters in the described groove 61 to stop gas-pressurized to move laterally, thereby can prevent that gas-pressurized is around going into to master mold portion 6 surfaces (referring to Figure 22) through fusion.

At this moment, the part that forms side for the die cavity that to utilizing gas-pressurized G synthetic resin J is not pressurized to master mold portion 6 is carried out the pressurization more than the required degree, via small slit between the male model portion 27 and nested 65 and outflow flow channel 67, and the gas-pressurized G in the die cavity S is collected compression with in the storage tank 47.On the other hand, be collected in described compression with the gas-pressurized in the storage tank 47 via described slit and flow out flow channel 67 and supply in the die cavity S, so that described gas-pressurized also spreads all over the part that can't fully pressurize.Thus, also can prevent this gas-pressurized around go into to master mold portion 6 or from the slot leakage between master mold portion 6 and the male model portion 27 to the Coinjection molding apparatus outside, can utilize gas-pressurized thus and the surface pressure of synthetic resin is carried out abundant pressurize to the die cavity formation face of master mold portion 6.

And, above embodiment illustration when making the article shaped moulding of writing board shape, the peripheral part of the upper surface nested 65 makes the protuberance 60 that enters in the die cavity S outstanding, and between described master mold portion 6 and protuberance 60, forming groove 61, the following embodiment that is described as follows according to Figure 23 to Figure 26, promptly, when die cavity S is presented under the moulding situation of article shaped of the shape the loam cake (four vertical planes that have rectangular-shaped horizontal plane and hang down from each limit of described horizontal plane) as casing, can prevent the leakage of gas-pressurized as much as possible.

At first, nested 66 of rectangular shape roughly is entrenched in the recess that is formed in the male model portion 27 and is fixed in the described male model portion 27 nested 66, utilize master mold portion 6, nested 66 and male model portion 27 form die cavity S, utilize nested 66 and male model portion 27 form the bottom surface of die cavity S.

Particularly, make protuberance 62 outstanding in the inboard slightly of the peripheral end of described nested 66 upper surfaces, described protuberance 62 forms lifting upward, then, along with near inboard and tilt and enter in the die cavity S to lower, and drift angle be the roughly rectangular triangle in the longitudinal section about 20～45 degree for example.In addition, also the upper surface open edge part in the male model portion 27 of the recess that forms male model portion 27 makes protuberance 63 outstanding, described protuberance 63 tilts to lower along with the close outside after forming and making each the side lifting that forms recess, and enter in the die cavity S, and drift angle is the rectangular triangle roughly of the longitudinal section about 20～45 degree for example.At this moment, described protuberance 63 forms and is higher than described protuberance 62, between the protuberance 63 of described nested 66 protuberance 62 and male model portion 27, form to have and can not allow the groove 64 of width (for example being the following width of 0.5mm) of the degree that gas-pressurized G enters.In addition, protuberance 62,63 forms continuously and is tetragonal frame shape (band shape) under the viewed in plan, but being not limited to this, and can be also discontinuous, may get final product around going into the part (zone) that leaks into the Coinjection molding apparatus outside to male model portion 27 surfaces so long as be arranged on gas-pressurized.

And, at first injection is a certain amount of behind the synthetic resin J of fusion in described die cavity S, described synthetic resin J can cross the hypotenuse portion of protuberance 63 and a part is entered in the groove 64 (referring to Figure 24), then behind the gas-pressurized of supplying with in die cavity S via supply valve and gas injection channel 28D from pressurized-gas source, formation gas-pressurized layer (referring to Figure 25) between the synthetic resin J of fusion is with nested 66 that can be in being expelled to die cavity S.

And then, after injecting gas-pressurized, described gas-pressurized can arrive the top of described nested 66 protuberance 62, but because the protuberance 63 of male model portion 27 is formed in the position of the level that is higher than described nested 66 protuberance 62, so gas-pressurized can pressurize under the state of not crossing described protuberance 63 (referring to Figure 26 and Figure 27).

Promptly, as mentioned above, the protuberance 63 of male model portion 27 is formed on the position of the level that is higher than described nested 66 protuberance 62, even if, the synthetic resin J through fusion that enters in the described groove 64 can not blocked with the synthetic resin J through fusion that does not enter in the described groove 64 so utilize gas-pressurized to come the synthetic resin J through fusion is carried out pressurize yet.When gas-pressurized when being blocked is crossed two protuberances 62,63 and sometimes around going into to male model portion 27 surfaces and leaking into the Coinjection molding apparatus outside, therefore, described formation can prevent described gas-pressurized around going into, can carry out abundant pressurize thus and the synthetic resin J through fusion was hardened in the pressurized time.

Like this, example of the present invention is illustrated, but for a person skilled in the art, can also design various replacement examples according to the above description, revise example or variation, so the present invention also comprises above-mentioned various replacement example, revises example or variation in not breaking away from the scope of its purport.

Claims (15)

1, a kind of injection moulding method, injection is through the synthetic resin of fusion and make it moulding in the die cavity that is formed between master mold and the male model, and described injection moulding method is characterised in that,

By in the hot media channel of described master mold, supplying with thermal medium, come that the die cavity of described master mold is formed the face side and heat and make it to begin and heat up,

After described intensification is stopped, the synthetic resin through fusion of injection scheduled volume in described die cavity,

After described injection finishes, between the die cavity formation face of the described synthetic resin back side and described male model, inject gas-pressurized, so that the surface pressure of synthetic resin is carried out pressurize to the die cavity formation face of described master mold,

Utilize described gas-pressurized to carry out pressurize on one side, to the described hot media channel of described master mold in supply with cooling medium on one side, so that forming the synthetic resin of face side, the die cavity of described master mold hardens.

2, the injection moulding method according to claim 1 is characterized in that,

If described synthetic resin hardens to a certain degree, then outside Coinjection molding apparatus, discharge after the described gas-pressurized, between the die cavity formation face of the described synthetic resin back side and described male model, inject refrigerating gas.

3, the injection moulding method according to claim 1 is characterized in that,

When being provided with in the recess that is being formed at described male model upper surface when on article shaped, forming the thin-walled organizator of thinner wall section, gas-pressurized is collected in the storage tank, described gas-pressurized is to be injected in the described die cavity via the slit between described thin-walled organizator and the described male model, to prevent that the part on the die cavity formation face that described synthetic resin can be pressurized to described master mold is carried out pressurization more than the required degree, on the other hand, the gas-pressurized that is collected in the described storage tank is supplied to the part that can't fully pressurize via above-mentioned slit.

4, the injection moulding method according to claim 1 is characterized in that,

When being provided with in the recess that is being formed at described male model upper surface when on article shaped, forming the opening organizator of peristome, the gas-pressurized that will be injected in the described die cavity via the slit between described opening organizator and the described male model is collected in the storage tank, to prevent that the part on the die cavity formation face that described synthetic resin can be pressurized to described master mold is carried out pressurization more than the required degree, on the other hand, the gas-pressurized that is collected in the described storage tank is supplied to the part that can't fully pressurize via described slit.

5, a kind of Coinjection molding apparatus, injection is through the synthetic resin of fusion and make it moulding in the die cavity that is formed between master mold and the male model, and described Coinjection molding apparatus is characterised in that,

In described master mold along described die cavity form supplying with the hot media channel that heat medium or cooling medium are used, and in described male model, form the gas injection channel with pressurized gas supply to described die cavity,

By in the hot media channel of described master mold, supplying with thermal medium, come that the die cavity of described master mold is formed the face side and heat and make it to begin and heat up,

After described intensification is stopped, the synthetic resin through fusion of injection scheduled volume in described die cavity,

After described injection finishes, between the die cavity formation face of the described synthetic resin back side and described male model, inject gas-pressurized via described gas injection channel, so that the surface pressure of synthetic resin is carried out pressurize to the die cavity formation face of described master mold,

Utilize described gas-pressurized to carry out pressurize on one side, to the described hot media channel of described master mold in supply with cooling medium on one side, so that forming the synthetic resin of face side, the die cavity of described master mold hardens.

6, a kind of Coinjection molding apparatus, after the described die cavity formation face side to described master mold heats, injection is through the synthetic resin of fusion in the die cavity that is formed between master mold and the male model, and gas-pressurized is injected between the die cavity formation face of the described synthetic resin back side and described male model, so that the surface pressure of synthetic resin is carried out pressurize to the die cavity formation face of described master mold, described Coinjection molding apparatus is characterised in that

Utilize die matrix and be fixed on the cylindrical portion bottom surface that described male model in the formed recess on the described die matrix forms described die cavity, described die cavity is that the space by space of extending in the horizontal direction and the tubular that extends in vertical direction that is being communicated with described space is formed

Each upper surface end in the aligned portions of described die matrix and described male model, be frame shape ground respectively along described aligned portions and form the protuberance of giving prominence to upward to enter into the mode in the die cavity mutually, and when two protuberances are docked, forming groove on the top of two protuberances.

7, a kind of Coinjection molding apparatus, after the described die cavity formation face side to described master mold heats, injection is through the synthetic resin of fusion in the die cavity that is formed between master mold and the male model, and gas-pressurized is injected between the die cavity formation face of the described synthetic resin back side and described male model, so that the surface pressure of synthetic resin is carried out pressurize to the die cavity formation face of described master mold, described Coinjection molding apparatus is characterised in that

Utilize the die matrix of fixing described male model to form the cylindrical portion bottom surface of described die cavity, described die cavity is that the space by space of extending in the horizontal direction and the tubular that extends in vertical direction that is being communicated with described space is formed,

Upper surface end at the described die matrix of aiming at the aligned portions of described male model, be frame shape ground along described aligned portions and form the protuberance that projects upwards to enter into the mode in the described die cavity, and between described protuberance and described male model, forming groove.

8, a kind of Coinjection molding apparatus, after the described die cavity formation face side to described master mold heats, injection is through the synthetic resin of fusion in the die cavity that is formed between master mold and the male model, and gas-pressurized is injected between the die cavity formation face of the described synthetic resin back side and described male model, so that the surface pressure of synthetic resin is carried out pressurize to the die cavity formation face of described master mold, described Coinjection molding apparatus is characterised in that

Fixing in order to forming the nested of thinner wall section on article shaped in the embedded merging of the recess that is formed at described male model upper surface, described nested top enters in the described die cavity and the longitudinal section, top is upper base and is shorter than the trapezoidal shape of going to the bottom,

Forming protuberance at described nested upper surface, described protuberance forms and enters in the described die cavity and have the hypotenuse portion of quadrature roughly with described nested hypotenuse portion.

9, a kind of Coinjection molding apparatus, after the described die cavity formation face side to described master mold heats, injection is through the synthetic resin of fusion in the die cavity that is formed between master mold and the male model, and gas-pressurized is injected between the die cavity formation face of the described synthetic resin back side and described male model, so that the surface pressure of synthetic resin is carried out pressurize to the die cavity formation face of described master mold, described Coinjection molding apparatus is characterised in that

At described male model upper surface, so that top enters into mode and outstanding formation in order to forming the thin-walled formation portion of thinner wall section on article shaped in the described die cavity, the longitudinal section, top of described thin-walled formation portion is upper base and is shorter than the trapezoidal shape of going to the bottom,

Upper surface is forming protuberance in described thin-walled formation portion, and described protuberance forms and enters in the described die cavity and have the hypotenuse portion of quadrature roughly with the hypotenuse portion of described thin-walled formation portion.

10, according to Claim 8 or 9 described Coinjection molding apparatus, it is characterized in that,

Forming most advanced and sophisticated thin portion respectively at the top of described protuberance.

11, a kind of Coinjection molding apparatus, after the described die cavity formation face side to described master mold heats, injection is through the synthetic resin of fusion in the die cavity that is formed between master mold and the male model, and gas-pressurized is injected between the die cavity formation face of the described synthetic resin back side and described male model, so that the surface pressure of synthetic resin is carried out pressurize to the die cavity formation face of described master mold, described Coinjection molding apparatus is characterised in that

Fixing nestedly in the embedded merging of the recess that is formed at described male model upper surface, described nested top enters in the described die cavity and the longitudinal section, top is upper base and is shorter than the trapezoidal shape of going to the bottom,

Form first protuberance that enters into described die cavity respectively being positioned near described described male model upper surface nested, and

Form second protuberance respectively at described male model upper surface, described second protuberance have with the hypotenuse portion of described first protuberance roughly quadrature hypotenuse portion and enter in the described die cavity.

12, a kind of Coinjection molding apparatus, after the described die cavity formation face side to described master mold heats, injection is through the synthetic resin of fusion in the die cavity that is formed between master mold and the male model, and gas-pressurized is injected between the die cavity formation face of the described synthetic resin back side and described male model, so that the surface pressure of synthetic resin is carried out pressurize to the die cavity formation face of described master mold, described Coinjection molding apparatus is characterised in that

Fixing in order on article shaped, forming the nested of peristome in the embedded merging of the recess that is formed at described male model upper surface, describedly nestedly entering in the described die cavity and the top abuts to described master mold,

On described nested peripheral part, forming the protuberance that enters in the described die cavity and and described protuberance between forming groove.

13, a kind of Coinjection molding apparatus, after the described die cavity formation face side to described master mold heats, injection is through the synthetic resin of fusion in the die cavity that is formed between master mold and the male model, and gas-pressurized is injected between the die cavity formation face of the described synthetic resin back side and described male model, so that the surface pressure of synthetic resin is carried out pressurize to the die cavity formation face of described master mold, described Coinjection molding apparatus is characterised in that

Fixing in order on article shaped, forming the nested of peristome in the embedded merging of the recess that is formed at described male model upper surface, describedly nestedly entering in the described die cavity and the top abuts to described master mold,

On described nested peripheral part, forming first protuberance that enters in the described die cavity and and described first protuberance between forming groove,

Forming second protuberance that enters into to surround the mode of described first protuberance in the described die cavity at described male model portion upper surface from the outside,

Between described second protuberance and described first protuberance, forming groove.

14, a kind of Coinjection molding apparatus, after the described die cavity formation face side to described master mold heats, injection is through the synthetic resin of fusion in the die cavity that is formed between master mold and the male model, and gas-pressurized is injected between the die cavity formation face of the described synthetic resin back side and described male model, so that the surface pressure of synthetic resin is carried out pressurize to the die cavity formation face of described master mold, described Coinjection molding apparatus is characterised in that

Fixing in the embedded merging of the recess that is formed at described male model upper surface nested,

Make the protuberance that enters in the described die cavity outstanding at described nested upper surface, and between the side of the described die cavity of formation of described protuberance and described master mold portion, forming groove.

15, a kind of Coinjection molding apparatus, after the described die cavity formation face side to described master mold heats, injection is through the synthetic resin of fusion in the die cavity that is formed between master mold and the male model, and gas-pressurized is injected between the die cavity formation face of the described synthetic resin back side and described male model, so that the surface pressure of synthetic resin is carried out pressurize to the die cavity formation face of described master mold, described Coinjection molding apparatus is characterised in that

Fixing in the embedded merging of the recess that is formed at described male model upper surface nested,

Make first protuberance that enters in the described die cavity outstanding at described nested upper surface, and at upper surface open edge part in order to the described male model portion that forms described recess, second protuberance that enters in the described die cavity is given prominence in the mode that is higher than described first protuberance

Between described second protuberance and described first protuberance, forming groove.

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