CN109109574A - Load-carrying Pneumatic belt tire - Google Patents
Load-carrying Pneumatic belt tire Download PDFInfo
- Publication number
- CN109109574A CN109109574A CN201810964056.7A CN201810964056A CN109109574A CN 109109574 A CN109109574 A CN 109109574A CN 201810964056 A CN201810964056 A CN 201810964056A CN 109109574 A CN109109574 A CN 109109574A
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- Prior art keywords
- belt
- tire
- load
- steel wire
- pulling force
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 40
- 239000010959 steel Substances 0.000 claims abstract description 40
- 238000000465 moulding Methods 0.000 claims abstract description 9
- 238000004073 vulcanization Methods 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 6
- 235000013399 edible fruits Nutrition 0.000 claims description 3
- 238000012360 testing method Methods 0.000 description 24
- 230000003014 reinforcing effect Effects 0.000 description 9
- 238000005728 strengthening Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 4
- 210000003754 fetus Anatomy 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000010998 test method Methods 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000032798 delamination Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000013007 heat curing Methods 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- SBNFWQZLDJGRLK-UHFFFAOYSA-N phenothrin Chemical compound CC1(C)C(C=C(C)C)C1C(=O)OCC1=CC=CC(OC=2C=CC=CC=2)=C1 SBNFWQZLDJGRLK-UHFFFAOYSA-N 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000013112 stability test Methods 0.000 description 1
- 238000012430 stability testing Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
- B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
- Tires In General (AREA)
Abstract
It is well balanced to there is a problem of that molding and vulcanised tyre durability, resistance to eccentric wear, handling stability are difficult to realize on same tires for existing belt structure, the invention proposes a kind of load-carrying Pneumatic belt tires, the expansion rate of its most inner side belt middle section is in 1.2%~1.9% range, there is the catastrophe point of curve tendency in the region that elongation is 0.8%~1.4% in " pulling force-elongation " curve of zero-degree belt steel wire, and the catastrophe point region is located at pulling force in the range of 40~110N；The present invention can make above-mentioned performance reach well balanced.
Description
Technical field
The invention belongs to Pneumatic belt tires, in particular to load-carrying Pneumatic belt tire.
Background technique
Belt structure in tire section schematic diagram shown in Fig. 1~3 is the structure that the current country is widely used.This
A little belt structures exist through overmolding and vulcanization process rear tyre durability, resistance to eccentric wear, handling stability in same wheel
It cannot achieve well balanced problem on tire.Especially the problem becomes especially to show under the increased trend of current groove depth
It writes.
Summary of the invention
The present invention provides a kind of inhibition belt edges generation delamination problems, while can also improve the load of handling stability
Weight Pneumatic belt tire, specifically includes following technical solution:
Load-carrying Pneumatic belt tire, by least one layer of band formed in steel wire arranged in parallel in the tire circumferential direction
Beam layer；Belt has a steel wire in two shoulder regions, " pulling force-extension curve " of the steel wire elongation be 0.8%~
Occur the catastrophe point of curve tendency in 1.4% region, and the catastrophe point region is located in the range of pulling force is 40~110N, and
Elongation at break is 5% or more.
Preferably, the load-carrying is covered in the tension belt of entire crown areas most with Pneumatic belt tire
The middle section expansion rate of lower layer's belt is after the completion of molding procedure and vulcanization process, after calculating according to the following formula, occurs
In the range of 1.2%~1.9%,
Wherein, rf: belt diameter when being fitted on banding assembly drum；rf: the belt diameter in vulcanization rear mold.
Preferably, the pulling force of the belt steel wire-extension curve catastrophe point control is between 1.0%~1.2%.
Preferably, the belt steel wire of tire pulling force when elongation is 1% is at least 400N.
Preferably, the belt is the superposition of multilayer banding layer, band of the fruit by the belt of carcass side than leaning on tyre surface side
Beam layer is narrow, and the belt at both ends can cover the both ends of the belt by carcass side on the outside of the belt by tyre surface side.
Preferably, the tire has the superposition of multilayer banding layer, the belt by the belt of carcass side than leaning on tyre surface side
Width, by tyre surface side belt on the outside of both ends be covered with " pulling force-extension curve " described above elongation be 0.8%~
Occur the catastrophe point of curve tendency in 1.4% region, and the catastrophe point region is located in the range of pulling force is 40~110N, and
Circumferential belt of the elongation at break 5% or more.
Durability is realized using above technical scheme and meets or exceeds standard tire, while resistance to eccentric wear performance and handling steady
Qualitative remain on keeps previous level constant, for the tire for using common stretch characteristics steel wire, can significantly mention
Rise endurance quality, resistance to eccentric wear performance and handling stability.
Detailed description of the invention
Fig. 1,2,3 are the applicable Pneumatic radial tire for heavy load example of the present invention；
Fig. 4 is the structural schematic diagram of embodiment 1；
Fig. 5 is tension belt steel wire and the pulling force-extensograph comparison schematic diagram for strengthening belt steel wire；
Fig. 6 is the belt expansion rate calculation specifications by carcass side；
Fig. 7 is the expansion rate calculation specifications for strengthening belt；
Belt expansion mechanism explanation when Fig. 8 is vulcanization；
Fig. 9 is pulling force-extension curve graph of steel wire after strengthening the naked steel wire of belt under different expansion rates and vulcanizing；
Figure 10 be catastrophe point 2% and 1% naked steel wire curve graph and catastrophe point after 1% vulcanization steel wire curve
Figure；
Figure 11~13 are intersecting angle and resistance to eccentric wear performance, the relationship of handling stability result
Symbol description
1, load-carrying Pneumatic belt tire；
2, tyre surface；
3,4, tension belt；
5, protectiveness belt；
6, strengthen belt；
7, carcass.
Specific embodiment
Embodiment 1
Illustrate by taking belt structure shown in FIG. 1 as an example (with reference to the label of Fig. 4).In the structure, have and tire circumferential direction
In the tension belt 3,4 of 10 °~45 ° superpositions that cross one another, cover the tension belt is located at crown central location
And the protection belt 5 of narrower width, there are 2 layers or 3 layers of circumferential array above protection 5 both ends of belt, tension belt 4
And reinforcing belt 6 parallel to each other.Strengthen the outer end point of belt 6 more than that wider layer in tension belt 3,4
Close to circumferential line.
Reinforcing belt 6 in above structure due to being circumferentially arranged in parallel, so molding with vulcanization process in,
Other tension belts 3,4 of the no image of Buddha or protection belt 5 make up the increase of belt perimeter by angle change like that,
Therefore strengthening belt 6 is by solving the problems, such as perimeter change using " pulling force-extension curve " characteristic as shown in Figure 5.
Since the elongation characteristics are the structural elongation functions of playing steel wire by adjusting the lay pitch of steel wire, so such steel wire
Referred to as high drawing steel wire.
In molding procedure, belt is fitted on the belt fit drum of certain perimeter tire, is shaped to fetus.Then
Fetus is put into specified mold, is given pressure and heat in fetus inner surface, is completed heat cure.During this, respectively
Radial expansion can occur for belt, and the ratio of the belt diameter after vulcanization and belt diameter when molding becomes expansion
Rate.
Fig. 6 and Fig. 7 is the calculating benchmark schematic diagram formed when with each belt expansion rate on vulcanised tyre respectively.Expansion
The calculation formula of rate may be summarized to be:
Wherein, rf: belt diameter when being fitted on banding assembly drum；rf: the belt diameter in vulcanization rear mold.
Width can be taken for the sake of convenient if it is two layers of arrangement for reinforcing belt 6 circumferentially arranged in parallel
Its expansion rate is calculated with the center of thickness.
As it was noted above, radial expansion can occur for each belt in vulcanization process.At this point, due to tension belt 3,
4 for functional factor must use the wire material of no structural extension, so can occur as shown in figure 8, being become by angle
Change to realize expansion radially.But such angle change is not uniformly to occur in entire belt transverse direction.Sulphur
When change, angle change will not occur substantially near the endpoint of belt two sides, but rely on the expansion of steel wire spacing to realize diameter
Upward expansion.So the cross layered tension belt 3,4 after vulcanization, the angle of bizet middle section can be than molding
When it is small, and both ends then substantially keep molding when angle it is constant.
The case where we emphatically change belt angle under different banding expansion rates and the difference for strengthening belt 6 are stretched
Influence of the long characteristic to tyre performance is investigated and has been studied.Respondent is 315/80R22.5, vertically and horizontally decorative pattern, mold
Decorative pattern ditch depth 18mm devises the test tire of 7 kinds of different expansion rates and is evaluated.
Table 1
Table 2
Left side is the tension belts 3 of 7 testing programs calculated according to the expansion rate calculation formula and strong in table 1
Change the expansion rate of belt 6.The test tire of 7 kinds of different expansion rates is made according to this table, and tests their performance.It is wherein resistance to
Belt material used in tension belt 3,4 is 3+8 × 0.33ST, strengthen the material that uses of belt 6 be 3 × 4 ×
0.22HE, and its pulling force-extension curve catastrophe point appears in when extending 2%.Fitting angle (the phase of tension belt 3 and 4
For circumferential direction) it is respectively 25 ° and 15 °, strengthening 6 angle of belt is 0 °.Belt structure is as shown in Figure 1, either steel wire
Characteristic or belt structure are all the very common belt designs of China.
Indoor lathe endurance test, the test of vehicle eccentric wear and vehicle manipulation have been carried out to the tire of above-mentioned 7 testing programs
Property stability test.Wherein indoor lathe endurance test method is quoted from United States Department Of Transportation certification test standard；Eccentric wear examination
Testing is the abrasion measures of dispersion for measuring bizet center and shoulder after test tire is mounted on vehicle front wheel positions and travels 40,000 kilometers；
Handling stability testing method is quoted from ISO evaluation criterion.The above two test result is by index displaying, the higher representative of index
Performance is better.One uses scoring mechanism afterwards, and 10 points of full marks, 7 points or more qualified, and trained test driver can experience out 1
The difference divided, normal driver can experience 2 points out of difference.
The tire of scheme 7 cannot fully be upheld due to strengthening belt 6, and tire exhibits go out apparent defect, Wu Fayong
In performance test, therefore exclude except comparison result.The tire of scheme 4 is the specification that my company normally produces at present.
The result of the above performance test is listed in 1 right side of table.From the results, it was seen that after banding expansion rate becomes larger, durability
It can get a promotion, but resistance to eccentric wear performance and handling stability can be deteriorated simultaneously；And after expansion rate becomes smaller, resistance to eccentric wear performance
Improve with handling stability, but durability declines to a great extent.
In order to find out the reason of leading to the above results, we are again to the steel at belt center and both ends after test tire vulcanization
Silk arrangement angle is measured, such as table 2.The results show that becoming larger with belt expansion rate, the arrangement of bizet middle section
Angle [alpha] successively becomes smaller, although and the arrangement angle β near two-end-point also shows same trend, amplitude of variation is much smaller than
Middle section α, it is believed that hardly influenced by expansion rate.Referring again to this angle change once and above-mentioned test result
It can be found if relationship, the performance of resistance to eccentric wear performance and handling stability is fine or not mutual with tension belt 3,4
Intersecting angle is related.Here intersecting angle refers to the arrangement angle α 1 of tension belt 3 and the arrangement of tension belt 4
Angle [alpha] 2 and α 1+ α 2.
The intersecting angle of tension belt rigidly has a great impact to the radially bending of tyre surface, and radially bending is rigid
It will affect resistance to eccentric wear performance and handling stability.Intersecting angle is shown in resistance to eccentric wear performance, the relationship of handling stability result
Figure 11~13, it can be seen that when intersecting angle is 36 ° or so, superiority and inferiority separation occurs in the two performance.
In terms of durability, since the angle change at belt both ends is obvious not as good as the angle change of middle section, so I
Focus be placed on strengthen belt 6 vulcanization before pretension size on.Reinforcing banding is stripped from above-mentioned test tire
Layer steel wire is fabricated to sample, tests its pulling force-extension curve, test object be scheme 1 (strengthening belt expansion rate 0.1%) with
Scheme 4 (strengthens belt expansion rate 0.9%).Do not apply any pulling force to steel wire in the lab simultaneously, directly covers glue, then
Vulcanization is produced the steel wire test that pretension is 0, is compared with without the naked steel wire for covering glue, such as Fig. 9.It can be seen that reinforcing tape
Steel wire pulling force-extension the curve for 1 tire of scheme that 6 expansion rate of beam layer is 0.1% and the steel wire without pretension in laboratory
Curve is almost the same.
Being radially expanded for tread cap can be estimated in the range of 0.5%~1.5% usually under standard pressure, this
In the case of scheme 1 tire belt modulus only have scheme 4 belt modulus 30%~40%, that is to say, that for
For the smaller tire of this kind of belt expansion rate, their reinforcing belt all cannot be abundant in entire production process
Stretching so that strengthen belt invigoration effect can not play, cause durability to be deteriorated.
Based on the above inference, we make its pulling force-extension curve catastrophe point by adjusting the lay pitch of 3 × 4 × 0.225HE
It is advanced near 1.1%, is then combined using this steel wire according to following scheme, carried out the second wheel durability, eccentric wear
The test of energy, handling stability.
Table 3
Table 4
| No. | Indoor lathe is durable | Resistance to eccentric wear performance | Handling stability |
| 1-A | 108 | 135 | 8 |
| 2-A | 105 | 134 | 8 |
| 3-A | 100 | 128 | 8 |
| 4 | 100 | 100 | 7 |
| 8 | 90 | 135 | 8 |
Table 5
Table 3 is the arrangement and method for construction of the second wheel test tire, and scheme 1-A, 2-A, 3-A are the reinforcing tape former scheme 1,2,3
Beam layer steel wire, which is used pulling force-extension curve catastrophe point instead and be advanced to, upholds steel wire near 1.1% and the test tire made.Side
Case 4 is standard tire, and scheme 8 is that belt fit angle ensures the belt intersecting angle after its vulcanization when having adjusted molding
36 ° or more of comparative tire.
Table 4 is according to the test result of the tire of 3 scheme of table construction, and test method is identical as first round test method.From
As a result it can be seen that, pulling force-extension curve catastrophe point of reinforcing belt steel wire from 2% be advanced to 1.1% scheme 1-A,
2-A, 3-A realize durability and meet or exceed standard tire, while resistance to eccentric wear performance and handling stability remain on holding
Previous level is constant, and overall performance ratio has more fully surmounted standard tire.Although simultaneously it can also be seen that the resistance to eccentric wear performance of scheme 8
It is improved with handling stability, but durability is also deteriorated.
Table 5 is the angle change situation of the test tire tension belt 3,4 of table 3.Scheme 1-A, 2-A, 3-A, 4 angle
There is difference slightly when although testing with the first round, angular distribution generally is also consistent.Durable sex expression is poor
Scheme 8, the intersecting angle of the tension belt 3,4 of bizet is 36.5 °, close with scheme 2-A, but its two-end-point is attached
Close intersecting angle has reached 41.3 °, is higher than other all schemes.It is well known that near tension belt endpoint in industry
Intersecting angle if it exceeds 40 ° of sharply declines that can cause belt durability, therefore want by adjusting belt fitting
Angle is come so that the intersecting angle of bizet middle section is reached proper level be that will necessarily cause two end regions intersecting angles
The value that transfinites is to reduce durability.
From result above it may be concluded that if the tension belt intersecting angle of bizet to be allowed to be in 36 ° or more,
Intersecting angle near two-end-point is no more than 40 °, it is necessary to make tension belt expansion rate control by carcass 1.9% with
Under.And thus bring belt vulcanizes the hypodynamic problem of post-tensioning, it can be by correspondingly changing steel according to required expansion rate
Pulling force-extension curve of silk solves.Pulling force-extension curve graph of steel wire after Figure 10 is the naked steel wire of scheme 3-A and vulcanizes, can
To find out, the curve graph and curve graph after the vulcanization of standard tire scheme 4 are almost the same.In summary:
1. being controlled in 1.2%~1.9% range in tension belt close to that layer of belt expansion rate of carcass
When, the belt intersecting angle of bizet middle section may be implemented 36 ° or more, and the belt intersecting angle near both ends can be controlled
System is at 40 ° or less, ideally 39 ° or less.
2. strengthen pulling force-extension curve catastrophe point control of 6 steel wire of belt 0.8%~1.4%, ideally
When 1.0%~1.2%, it is ensured that strengthen belt under above-mentioned expansion rate 1. and still be able to play due reinforcing effect
Fruit.
By implementing while above 2 measures, for the tire for using common stretch characteristics steel wire, Ke Yiming
Endurance quality, resistance to eccentric wear performance and handling stability are promoted aobviously.
Claims (6)
1. load-carrying Pneumatic belt tire, by least one layer of banding formed in steel wire arranged in parallel in the tire circumferential direction
Layer；Belt has steel wire in two shoulder regions, it is characterised in that: " pulling force-extension curve " of the steel wire be in elongation
Occurs the catastrophe point of curve tendency in 0.8%~1.4% region, and the catastrophe point region is located at the model that pulling force is 40~110N
In enclosing, and elongation at break is 5% or more.
2. load-carrying Pneumatic belt tire according to claim 1, it is characterised in that: the load-carrying Pneumatic belt
Tire covers the middle section expansion rate of the lowest level belt in the tension belt of entire crown areas in molding procedure
After the completion of vulcanization process, after calculating according to the following formula, in the range of appearing in 1.2%~1.9%,
Wherein, rf: belt diameter when being fitted on banding assembly drum；rf: the belt diameter in vulcanization rear mold.
3. load-carrying Pneumatic belt tire as claimed in claim 1 or 2, it is characterised in that: the belt steel of the tire
Silk pulling force when elongation is 1% is at least 400N.
4. load-carrying Pneumatic belt tire as described in claim 1, it is characterised in that: the pulling force-of the belt steel wire
The control of curve catastrophe point is upheld between 1.0%~1.2%.
5. the load-carrying Pneumatic belt tire as described in claims 1 to 3 any one, it is characterised in that: the belt
For the superposition of multilayer banding layer, belt of the fruit by carcass side is narrower than the belt by tyre surface side, outside the belt by tyre surface side
The belt at side both ends can cover the both ends of the belt by carcass side.
6. the load-carrying Pneumatic belt tire as described in claims 1 to 3 any one, it is characterised in that: the tire has
The superposition of multilayer banding layer, the banding slice width by the belt of carcass side than leaning on tyre surface side, two on the outside of the belt by tyre surface side
End covers circumferential belt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810964056.7A CN109109574A (en) | 2018-08-23 | 2018-08-23 | Load-carrying Pneumatic belt tire |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810964056.7A CN109109574A (en) | 2018-08-23 | 2018-08-23 | Load-carrying Pneumatic belt tire |
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| Publication Number | Publication Date |
|---|---|
| CN109109574A true CN109109574A (en) | 2019-01-01 |
Family
ID=64860716
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810964056.7A Pending CN109109574A (en) | 2018-08-23 | 2018-08-23 | Load-carrying Pneumatic belt tire |
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| Country | Link |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111460616A (en) * | 2020-03-03 | 2020-07-28 | 中策橡胶集团有限公司 | Tire simulation design method and application thereof |
| CN112848807A (en) * | 2021-01-29 | 2021-05-28 | 山东玲珑轮胎股份有限公司 | Curved surface laminating drum design method and curved surface laminating drum |
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| CN106046443A (en) * | 2016-07-13 | 2016-10-26 | 安徽佳通乘用子午线轮胎有限公司 | Polymer rubber composition for winter tires and preparing method and application thereof |
| CN206297362U (en) * | 2016-12-26 | 2017-07-04 | 正新橡胶（中国）有限公司 | A kind of semi-steel radial pneumatic tire and its shaped device |
| CN108407553A (en) * | 2018-04-16 | 2018-08-17 | 中策橡胶集团有限公司 | A kind of heavily loaded Pneumatic belt tire with high structural elongation rate tyre ring reinforcement material |
| CN108422811A (en) * | 2018-04-16 | 2018-08-21 | 中策橡胶集团有限公司 | A kind of flat 70 or less serial heavy duty pneumatic radial tire |
| CN209208375U (en) * | 2018-08-23 | 2019-08-06 | 中策橡胶集团有限公司 | Load-carrying Pneumatic belt tire |
-
2018
- 2018-08-23 CN CN201810964056.7A patent/CN109109574A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101024368A (en) * | 2006-02-22 | 2007-08-29 | 东洋橡胶工业株式会社 | Pneumatic tire and manufacturing method of the same |
| CN101596841A (en) * | 2009-06-04 | 2009-12-09 | 青岛双星轮胎工业有限公司 | Air-inflation tyre |
| CN106046443A (en) * | 2016-07-13 | 2016-10-26 | 安徽佳通乘用子午线轮胎有限公司 | Polymer rubber composition for winter tires and preparing method and application thereof |
| CN206297362U (en) * | 2016-12-26 | 2017-07-04 | 正新橡胶（中国）有限公司 | A kind of semi-steel radial pneumatic tire and its shaped device |
| CN108407553A (en) * | 2018-04-16 | 2018-08-17 | 中策橡胶集团有限公司 | A kind of heavily loaded Pneumatic belt tire with high structural elongation rate tyre ring reinforcement material |
| CN108422811A (en) * | 2018-04-16 | 2018-08-21 | 中策橡胶集团有限公司 | A kind of flat 70 or less serial heavy duty pneumatic radial tire |
| CN209208375U (en) * | 2018-08-23 | 2019-08-06 | 中策橡胶集团有限公司 | Load-carrying Pneumatic belt tire |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111460616A (en) * | 2020-03-03 | 2020-07-28 | 中策橡胶集团有限公司 | Tire simulation design method and application thereof |
| CN111460616B (en) * | 2020-03-03 | 2023-04-14 | 中策橡胶集团股份有限公司 | Tire simulation design method and application thereof |
| CN112848807A (en) * | 2021-01-29 | 2021-05-28 | 山东玲珑轮胎股份有限公司 | Curved surface laminating drum design method and curved surface laminating drum |
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Address after: 310018 No. 1, No. 1 Street, Qiantang District, Hangzhou, Zhejiang Applicant after: Zhongce Rubber Group Co.,Ltd. Address before: 310018 No.2, 10th Street, Hangzhou Economic and Technological Development Zone, Zhejiang Province Applicant before: ZHONGCE RUBBER GROUP Co.,Ltd. |
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