CN203063137U - Slice for film forming device - Google Patents
Slice for film forming device Download PDFInfo
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- CN203063137U CN203063137U CN 201220640001 CN201220640001U CN203063137U CN 203063137 U CN203063137 U CN 203063137U CN 201220640001 CN201220640001 CN 201220640001 CN 201220640001 U CN201220640001 U CN 201220640001U CN 203063137 U CN203063137 U CN 203063137U
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- urceolus
- clamp
- molten resin
- elasticity
- press part
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Abstract
The utility model provides a slice for film forming device. The forming device can further reduce the forming thickness of the slice or film which is free from residual strain and is suitable for optical application and can carry out high-precision transfer on embossed surfaces and the like. The slice for film forming device comprises a first clamping and pressing portion (1), a second clamping and pressing portion (2), a trimming part (40), an introducing portion (50) and a winding roller (60), wherein a main roller (10) is provided with a high-rigidity metallic rigid outer barrel (11) and cooling space in the rigid outer barrel (11); a first press roller (20) is provided with a thin-wall metallic first elastic outer barrel (21) and cooling space in the first elastic outer barrel (21); a second press roller (30) is provided with a thin-wall metallic second elastic outer barrel (31) and cooling space in the second elastic outer barrel (31); the wall thickness of the second elastic outer barrel (31) is greater than that of the first elastic outer barrel (21); and the forming pressure of the second clamping and pressing portion (2) is greater than that of the first clamping and pressing portion (1).
Description
Technical field
The utility model relates to thin slice or the film forming device of the shaping of the thin slice that is applicable to optical applications or film.
Background technology
The applicant opens flat 11-235747 number the open communique spy of patent documentation 1(Japan Patent) in a kind of thin slice or film forming device are disclosed, its metallic roll by high rigidity constitutes home roll, and constituted by the thin-wall metal urceolus with elasticity (flexible) and to press pressure roller, contact with the home roll face by making thin-wall metal urceolus strain and press metallic roll, making by pressure roller.
In above-mentioned building mortion, because the thin slice of a cramping formation or the forming thickness of film are adjusted, more need to strengthen forming pressure so the forming thickness of expectation is more thin, the problem that occurs thin-wall metal urceolus generation plastic deformation sometimes, can occur when on the other hand, forming pressure is too small can not get good problems such as transfer surface with the driving fit variation of home roll.
The utility model content
In order to address the above problem, the purpose of this utility model is to provide a kind of thin slice or film forming device, can make no overstrain and be applicable to that the thin slice of optical applications or the forming thickness of film become thinner, can also carry out the transfer printing of embossing face etc. with high accuracy.
Thin slice of the present utility model or film forming device comprise: first clamp-press part will be shaped by the pressure roller cramping by home roll and first from the molten resin that extrusion shaper is extruded; Second clamp-press part, the molten resin that will send from described first clamp-press part along the outer peripheral face of home roll is shaped by the pressure roller cramping by home roll and second; Finishing member, the width of the molten resin that cramping in described second clamp-press part is shaped cuts finishing; Introducing portion, the molten resin limit that the described second clamp-press part cramping is shaped are introduced between at least one pair of draw roll the limit and are sent; And takers-in, batch through the molten resin of described finishing member and described introducing portion, described thin slice or film forming device are characterised in that, described home roll has can be because of the cooling space in the metal that forming pressure is out of shape rigidity urceolus processed and the described rigidity urceolus, described first has with the cooling space in the flexible thin-wall metal system first elasticity urceolus and the described first elasticity urceolus by pressure roller, described second has with the cooling space in the flexible thin-wall metal system second elasticity urceolus and the described second elasticity urceolus by pressure roller, be set at the wall thickness of the described second elasticity urceolus greater than the wall thickness of the described first elasticity urceolus, and the forming pressure of described second clamp-press part is greater than the forming pressure of described first clamp-press part.
In addition preferably, at least one elasticity urceolus in the described first elasticity urceolus and the second elasticity urceolus and inner circumferential surface are left the gap and are embedded with inner core axle and a plurality of rib, described inner core axle is the shape configuration of same axle center, a plurality of described ribs are given prominence to setting and are circumferentially being divided cooling space to radial direction every certain angle from described inner core axle, and described rib forms spiral helicine runner around the axle center of described elasticity urceolus.
And preferably, described molten resin is applicable to the formation of thin slice or the film of optical applications.
According to thin slice of the present utility model or film forming device, strain by in first clamp-press part, utilizing the first elasticity urceolus, make first to contact with the home roll face and after cramping is shaped across molten resin by pressure roller, in second clamp-press part, utilize the second elasticity urceolus strain, make second by pressure roller across molten resin contact with the home roll face and again cramping be shaped, can form the thinner thin slice of forming thickness or film.In addition, by using than the second big elasticity urceolus of the first elasticity urceolus wall thickness, and second clamp-press part is shaped to carry out cramping greater than the forming pressure of the first clamp-press part forming pressure, the molten resin that temperature is reduced and continue sclerosis closely contacts by pressure roller with second with home roll easily, can be on molten resin high accuracy transfer printing minute surface or embossing face.Therefore, can form that forming thickness is thinner, transfer printing precision is higher and not have the thin slice that is applicable to optical applications or the film of overstrain.
In addition, in at least one side of the first elasticity urceolus 21 and the second elasticity urceolus 31, the rib that utilization is installed from inner core axial radii direction is divided into a plurality of spiral helicine runners with cooling space, and cooling fluid is evenly disperseed with the outer peripheral face of even cooling by pressure roller.In addition, even owing to be formed with the gap that also can not contact because of forming pressure generation strain between elasticity urceolus and the rib, so can not hinder the strain of clamp-press part, in addition, when the elasticity urceolus applies excessive forming pressure, also can suppress plastic deformation.
Description of drawings
Fig. 1 is the cross-sectional view of the primary structure embodiment of expression the utility model thin slice or film forming device, (a) structure of expression member, (b) expression size.
Fig. 2 is the skiagraph of same building mortion.
Fig. 3 is same second key diagram by the bizet of pressure roller.
Fig. 4 is that expression same second is by the schematic partial sectional view of the slot part of pressure roller.
Fig. 5 is the integrally-built figure of the same building mortion of schematic representation.
Description of reference numerals
The P molten resin
DT pattern tool
The forming pressure of F1 first clamp-press part
The forming pressure of F2 second clamp-press part
1 first clamp-press part
2 second clamp-press parts
10 home rolls
11 rigidity urceolus
15 runners
20 first press pressure roller
21 first elasticity urceolus
25 runners
30 second press pressure roller
31 second elasticity urceolus
35 runners
40 finishing members
50 introducing portions
The 50a draw roll
The 50b draw roll
60 takers-ins
The specific embodiment
Below, based on description of drawings embodiment of the present utility model.
As shown in Figure 1 and Figure 2, in the thin slice or film forming device of present embodiment, the molten resin P that extrudes by T pattern tool D from extruder, first clamp-press part, 1 cramping of being pressed between the pressure roller 20 by relative home roll 10 and first is shaped, and the molten resin P that will guide along the outer peripheral face of home roll 10, second clamp-press part, the 2 further crampings of being pressed between the pressure roller 30 by relative home roll 10 and second are shaped.In addition, the molten resin P of employing is not particularly limited, and preferably is applicable to the allyl resin of optical applications and Merlon etc. in the present embodiment.In addition, " relatively " in this specification refers to that the outer peripheral face and first of home roll 10 faces respectively by the outer peripheral face of pressure roller 30 by pressure roller 20 and second.
As shown in Figure 1 and Figure 2, home roll 10 has the turning cylinder 12 at rigidity urceolus 11 and difference supporting rigidity urceolus 11 both ends.Rigidity urceolus 11 is the metallic article of heavy wall, and does not have and can not have the steel pipe of joint to form by seamless steel pipe etc., and outer peripheral face be processed into minute surface or embossing face because of the high rigidity of forming pressure deformation extent.In addition, in rigidity urceolus 11, have cooling space, supply with the cooling fluid that is useful on the cooling outer peripheral face.
As shown in Figure 1 and Figure 2, first has the first elasticity urceolus 21 and supports the turning cylinder 22 at the first elasticity urceolus, 21 both ends respectively by pressure roller 20.The first elasticity urceolus 21 is thin-wall metal goods of the wall thickness t2 of the band elasticity (flexible) that formed by jointless steel pipes such as seamless steel pipes.And, in the first elasticity urceolus 21, possess cooling space, supply with the cooling fluid that is useful on the cooling outer peripheral face.In addition, second has with first by the identical structure of pressure roller 20 by pressure roller 30, comprises that the wall thickness t3 of the second elasticity urceolus 31 of thin-wall metal system and turning cylinder 32, the second elasticity urceolus 31 is greater than wall thickness t2.In the second elasticity urceolus 31, possesses cooling space.
Shown in Fig. 1 (b), if the external diameter of home roll 10 is made as D1, then first D outer diameter 2 and second of pressing pressure roller 20 press pressure roller 30 D outer diameter 3 as long as identical with the D outer diameter 1 of home roll 10 or less than D outer diameter 1, then be not particularly limited.D1＞D3 in the present embodiment＞D2.In addition, in order to have the elasticity (flexibility and flexible, restoration) near caoutchouc elasticity, the first elasticity urceolus 21 and the second elasticity urceolus 31 have carried out thin-walled property in the scope of the thin cylinder theory that can be suitable for Elasticity.Flexible with described thin cylinder theoretical evaluation is at t2/(D2/2)≤0.03, t3/(D3/2)≤condition was good in 0.03 o'clock.
As shown in Figure 1, by the molten resin P that T pattern tool D extrudes, supply to home roll 10 and first by first clamp-press part 1 between the pressure roller 20 from extruder.First clamp-press part, 1 place as shown in Figure 1 and Figure 2, home roll 10 rotates with peripheral speed V1, first by pressure roller 20 along and the direction of the direction of rotation of home roll 10 is rotated with peripheral speed V2 and press home roll 10 with the forming pressure F1 of regulation, molten resin P is fed into above-mentioned home roll 10 and first and is shaped by cramping between the pressure roller 20.At this moment, strain takes place in the first elasticity urceolus 21, and first presses pressure roller 20 contacts across molten resin P face with home roll 10.Then, as shown in Figure 1 and Figure 2, home roll 10 rotates with peripheral speed V1, second by pressure roller 30 along and the direction of the direction of rotation of home roll 10 is rotated with peripheral speed V3 and press home roll 10 with the forming pressure F2 of regulation, molten resin P by the guiding of the outer peripheral face of home roll 10 is imported into above-mentioned home roll 10 and second by second clamp-press part 2 between the pressure roller 30, and derive the cramping back that is shaped again.At this moment, strain takes place in the second elasticity urceolus 31, and second presses pressure roller 30 contacts with 10 of home rolls across molten resin P.Utilize the face of this first clamp-press part 1 and second clamp-press part 2 to contact, with unnecessary resin extruded and be distributed to outer distolaterally, can make the forming thickness homogenising.In addition, home roll 10, first is pressed peripheral speed V1, V2 and the V3 that pressure roller 20 and second is pressed pressure roller 30, can suitably set according to the kind of molten resin P and the forming thickness of needs.In addition, forming pressure is specially linear pressure, below, all represent linear pressure when only being called forming pressure.
At first clamp-press part, 1 place, because the temperature of molten resin P is high and enough flexibilities are arranged, so even also can make molten resin P and rigidity urceolus 11 and the 21 abundant driving fits of the first elasticity urceolus and transfer printing accurately with less forming pressure F1.To this, at second clamp-press part, 2 places, owing to being cooled, molten resin P continues sclerosis, therefore closely contact thereby need the powerful ground of molten resin P be crimped on rigidity urceolus 11 and the second elasticity urceolus 31 with bigger forming pressure F2.Therefore, the forming pressure F2 of second clamp-press part 2 need be set at the forming pressure F1 that is higher than first clamp-press part 1.
At this moment, the circumferential length K 1 of the contact-making surface of preferred first clamp-press part 1 and second clamp-press part 2, K2 equate substantially.That is, preferably adjust in advance, make home roll 10 and the first circumferential length K 1 by the contact-making surface of pressure roller 20 when applying forming pressure F1, the home roll 10 when applying forming pressure F2 is identical by circumferential length K 2 cardinal principles of the contact-making surface of pressure roller 30 with second.Like this, the circumferential length of each clamp-press part 1 during owing to be shaped, 2 the contact-making surface when molten resin P also can be kept identical substantially, so reduced the influence that the contact area size produces, can further guarantee the forming thickness attenuation of molten resin P and transfer printing minute surface or embossing face well.
According to said structure, after with first clamp-press part 1 molten resin P cramping being shaped, with second clamp-press part 2 with molten resin P again cramping be shaped, since can form thinner molten resin P and on molten resin P transfer printing minute surface or embossing face well, so can make thin slice or film no overstrain, that be applicable to optical applications.In addition, by using wall thickness greater than the second elasticity urceolus 31 of the first elasticity urceolus 21, and in second clamp-press part 2, carry out cramping with the forming pressure F2 greater than the forming pressure F1 of first clamp-press part 1 and be shaped, can improve that temperature reduces and the molten resin P and home roll 10 and the second also transfer printing accurately of adaptation by pressure roller 30 that continue sclerosis.Like this, thin slice that can forming thickness is thin or film stably are shaped with high finished product rate.
And, in the first elasticity urceolus 21, leave the gap with the inner peripheral surface of the first elasticity urceolus 21 and be embedded with inner core axle 23 and a plurality of rib 24, described inner core axle 23 disposes with same axle center shape with the axle center O2 of turning cylinder 22, and a plurality of ribs 24 arrange also along the circumferential cooling space of dividing to radial direction is outstanding every certain angle from inner core axle 23.And as shown in Figure 2, the axle center hole 23a of inner core axle 23 is communicated with the peristome 23b of another distolateral formation of the supply hole 26 of a distolateral formation of turning cylinder 22 and turning cylinder 22 respectively.In addition, peristome 23b is communicated with a plurality of runners 25, and a plurality of runners 25 are communicated with at the tap 27 that a peripheral part distolateral and supply hole 26 of turning cylinder 22 forms.Therefore, shown in the arrow of Fig. 2, cooling fluid supplies to axle center hole 23a from supply hole 26, and evenly disperses to be supplied to a plurality of runners 25 respectively after peristome 23b refluence, discharges from tap 27 again.In order to cool off more equably, constitute a plurality of coolings runner 25 by rib 24 in the present embodiment, runner 25 is around the axle center O2 shape formation in the shape of a spiral of turning cylinder 22.In addition, although rib 24 is formed around the helical form of axle center O2, also can form directly tabular along axle center O2 direction.In addition, " same axle center shape " refers to comprise the on all four state in a plurality of axle center in this specification, and the state that departs from because of the influence of foozle of a plurality of axle center.
As shown in Figure 1 and Figure 2, in the present embodiment in order further to improve cooling effect, the second elasticity urceolus 31 is also same as described above, leaves the gap with the inner peripheral surface of the second elasticity urceolus 31 and is embedded with inner core axle 33 and a plurality of rib 34, this inner core axle 33 and the configuration of the same axle center of axle center O3 shape.And cooling fluid is supplied to axle center hole 33a from supply hole 36 shown in the arrow of Fig. 2, and evenly disperses to supply to spiral helicine a plurality of runner 35 respectively after flowing backwards from peristome 33b, discharges from tap 37 again.And, when needs further improve cooling effect, also can as shown in Figure 1 and Figure 2 spiral helicine a plurality of runner 15 be set in the cooling space of rigidity urceolus 11.That is, seamlessly be embedded with inner circumferential surface in the rigidity urceolus 11: with the inner core axle 13 of the same axle center of axle center O1 shape configuration; And a plurality of ribs 14.Cooling fluid is supplied to axle center hole 13a from supply hole 16 shown in the arrow of Fig. 2, and evenly disperses to be supplied to spiral helicine a plurality of runner 15 respectively after peristome 13b refluence, discharges from tap 17 again.In addition, present embodiment middle rib 14,34 forms respectively around the helical form of axle center O1, O3, but also can form directly tabular along axle center O1, O3 direction respectively.
According to said structure, utilization is pressed pressure roller 20 and second first and is pressed in the pressure roller 30 from inner core axle 23, the 33 a plurality of ribs 24,34 to the outstanding setting of radial direction, form spiral helicine a plurality of runner 25,35, thus can make cooling fluid evenly disperse the back evenly cooling respectively by pressure roller 20,30 outer peripheral face.In addition, because between the first elasticity urceolus 21, the second elasticity urceolus 31 and a plurality of rib 24,34, even the gap that also can not contact when being formed with because of forming pressure F1, F2 generation strain, a plurality of ribs 24,34 can not hinder the cramping of first clamp-press part 1, second clamp-press part 2 to be shaped, even during the forming pressure more than having applied required forming pressure, can prevent that also each elasticity urceolus 21,31 from plastic deformation taking place.
In addition, in the present embodiment, second presses pressure roller shown in the dummy line of Fig. 1 (a), can rotate the location, back centered by the O1 of the axle center of home roll 10 according to the temperature of molten resin P.According to described structure, owing to second clamp-press part 2 can be configured on the position that molten resin P is in be suitable for the temperature range that cramping is shaped, so improved transfer printing precision.In addition, also second outer peripheral face by pressure roller 30 is transferred on the face (back side) that does not contact home roll 10, can improves the transfer printing precision at the back side.Herein, being suitable for temperature range that cramping is shaped and referring to material according to the resin that uses, be that the benchmark repetition test determines get final product with glass transition point etc. for example, does not make especially and limits.
As mentioned above, in second clamp-press part 2, owing to pass through on suitable temperature range molten resin P cramping shaping again, can form thinner molten resin P, can be on molten resin P high accuracy transfer printing minute surface or embossing face brightly, so can make the thin slice that is applicable to optical applications or the film of no overstrain.
In addition, comprise in the past the thin slice or film forming device of patent documentation 1, often can see the example that disposes the roller that molten resin P is peeled off from the outer peripheral face of home roll 10, described roller is for from home roll 10 guiding and derive the device of the molten resin of cooling, and is not to be shaped for cramping.
In addition, the first elasticity urceolus 21, the second elasticity urceolus 31 make elasticity and restoration become big by reducing wall thickness t2, t3, but work as along with forming pressure F1, F2 strengthen, the elasticity (flexible) at the both ends of the first elasticity urceolus 21, the second elasticity urceolus 31 is low, so first is bent into concavity by pressure roller 30 from central portion to end by pressure roller 20, second.Thus, might more to rely on central portion more thick for the forming thickness of molten resin P.Therefore, as shown in Figure 3, the second elasticity urceolus 31 forms entasis, and the external diameter of its central portion CL goes out the bizet C of regulation greatly than the external diameter at both ends.In addition, though do not illustrate among Fig. 3, the first elasticity urceolus 21 of present embodiment also possesses identical structure.
In addition, as shown in Figure 4, be bent into the another way of concavity as preventing the first elasticity urceolus 21, the second elasticity urceolus 31 from following the increase of forming pressure, can near the both ends of the second elasticity urceolus 31, form the slot part 38 that wall thickness t3 has been reduced attenuate amount Δ H respectively across full week.Utilize described slot part 38, can improve both ends flexible of the second elasticity urceolus 31.In addition, though do not illustrate among Fig. 4, the first elasticity urceolus 21 of present embodiment also possesses identical structure.Herein, the proper range of the attenuate amount Δ H of slot part 38 can suitably be set according to thickness t 2, t3 and each condition such as forming pressure F1, F2 of the first elasticity urceolus 21, the second elasticity urceolus 31.
In addition, above-mentioned bizet C and slot part 38 can be distinguished separately and to form, but by making up both, can more effective eliminating first elasticity urceolus 21, the baneful influence that brings of the bending of the second elasticity urceolus 31.
As shown in Figure 5, the thin slice of present embodiment or film forming device have in second downstream by pressure roller 30: finishing member 40 cuts and repairs the width of the molten resin P that cramping in second clamp-press part 2 is shaped; Introducing portion 50, the molten resin P that the limit is shaped cramping in second clamp-press part 2 introduces between at least one pair of draw roll 50a, 50b the limit it is sent; And takers-in 60, batch through the molten resin of finishing member 40 and introducing portion 50.Finishing member 40 for example is cutting knife and laser etc., cuts and be trimmed to the size of needs for the width of the molten resin P that cramping is shaped.In addition, introducing portion 50 is introduced between a pair of draw roll 50a, the 50b by the molten resin P that will be shaped in second clamp-press part 2, applies for suppressing the power that molten resin P shrinks because of cooling, to suppress the contraction of molten resin P.In the introducing portion 50, size difference that can be by making paired draw roll 50a, 50b or beyond a pair of draw roll 50a, 50b additional rollers or change the material of roller outer peripheral face, suitably adjust the size of the power that applies.In the present embodiment, thereby produce frictional force between one outer peripheral face use rubber among pair of rolls 50a, the 50b and the molten resin, another uses general metal roller processed, adjusts the power that is applied on the molten resin P.In addition, as shown in Figure 5, finishing member 40 and the introducing portion 50 of present embodiment set gradually, but are not limited thereto, as long as they are positioned at second downstream by pressure roller 30.And, utilize takers-in 60 to batch through the molten resin P of finishing member 40 and introducing portion 50.In addition; in second downstream of pressing pressure roller; except said apparatus; can also suitably be provided for measuring the measurer for thickness of the forming thickness of the molten resin P that cramping is shaped in second clamp-press part 2; be purpose and the positive and negative of the molten resin P that is shaped at cramping forms the mask machine of mask with protection thin slice or film, and judge that thin slice or film are general thin slice or the set structures of film forming device such as the testing fixture of certified products or defective work.
(experiment 1)
Use to possess above-mentioned home roll 10, first respectively by pressure roller 20, second building mortion by pressure roller 30, change the material of the second elasticity urceolus 31 and the kind of molten resin P as experiment parameter, made thin slice or the film of numerical example.As a comparative example, second adopted rigid roller by pressure roller.Its result, the transfer printing precision of the rear side of thin slice or film is low in the comparative example, and in whole experimental examples, the forming thickness of thin slice or film is thin, positive and negative has all been obtained high transfer printing precision.
Claims (3)
1. a thin slice or film forming device, comprising: first clamp-press part will be shaped by the pressure roller cramping by home roll and first from the molten resin that extrusion shaper is extruded; Second clamp-press part, the molten resin that will send from described first clamp-press part along the outer peripheral face of home roll is shaped by the pressure roller cramping by home roll and second; Finishing member, the width of the molten resin that cramping in described second clamp-press part is shaped cuts finishing; Introducing portion, the molten resin limit that the described second clamp-press part cramping is shaped are introduced between at least one pair of draw roll the limit and are sent; And takers-in, batching through the molten resin of described finishing member and described introducing portion, described thin slice or film forming device be characterised in that,
Described home roll has not can be because of the cooling space in the metal that forming pressure is out of shape rigidity urceolus processed and the described rigidity urceolus,
Described first has with the cooling space in the flexible thin-wall metal system first elasticity urceolus and the described first elasticity urceolus by pressure roller,
Described second has with the cooling space in the flexible thin-wall metal system second elasticity urceolus and the described second elasticity urceolus by pressure roller,
Be set at the wall thickness of the described second elasticity urceolus greater than the wall thickness of the described first elasticity urceolus, and the forming pressure of described second clamp-press part is greater than the forming pressure of described first clamp-press part.
2. thin slice according to claim 1 or film forming device is characterized in that,
At least one elasticity urceolus in the described first elasticity urceolus and the second elasticity urceolus and inner circumferential surface are left the gap and are embedded with inner core axle and a plurality of rib, described inner core axle is the shape configuration of same axle center, a plurality of described ribs are given prominence to setting and are circumferentially being divided cooling space to radial direction every certain angle from described inner core axle
Described rib forms spiral helicine runner around the axle center of described elasticity urceolus.
3. thin slice according to claim 1 and 2 or film forming device is characterized in that, described molten resin is applicable to the formation of thin slice or the film of optical applications.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220640001 CN203063137U (en) | 2012-11-28 | 2012-11-28 | Slice for film forming device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220640001 CN203063137U (en) | 2012-11-28 | 2012-11-28 | Slice for film forming device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203063137U true CN203063137U (en) | 2013-07-17 |
Family
ID=48761961
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220640001 Expired - Lifetime CN203063137U (en) | 2012-11-28 | 2012-11-28 | Slice for film forming device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203063137U (en) |
-
2012
- 2012-11-28 CN CN 201220640001 patent/CN203063137U/en not_active Expired - Lifetime
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Granted publication date: 20130717 |