CN1483564A - Method and device for preheating thick rubber products before vulcanizatcion and use thereof - Google Patents
Method and device for preheating thick rubber products before vulcanizatcion and use thereof Download PDFInfo
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- CN1483564A CN1483564A CNA031399266A CN03139926A CN1483564A CN 1483564 A CN1483564 A CN 1483564A CN A031399266 A CNA031399266 A CN A031399266A CN 03139926 A CN03139926 A CN 03139926A CN 1483564 A CN1483564 A CN 1483564A
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Abstract
The preheating method before vulcanization of thick rubber products adopts microwave heating process including several modes of low-power microwave energy heating mode, multipoint energy-feeding heating mode and intermittent multiple heating mode, and its preheating equipment includes furnace body, low-power microwave transmitting unit and continuous heat-transferring structure and heating mechanism. It can obviously raise production efficiency and product quality.
Description
Technical field
The present invention relates to the rubber heating technique, the method and apparatus and the application thereof of preheating before particularly a kind of vulcanizing thick rubber products.
Background technology
Last procedure of thick rubber products (tire) production process is sulfuration (crosslinked), sulfuration process directly influences the workmanship of thick rubber products, present sulfuration process is directly thick rubber products to be placed in the vulcanizer to vulcanize (without preheating), adopt temperature, time, the pressure three elements are controlled the sulfuration of thick rubber products, and requirement temperature in the whole process of tyre vulcanization keeps constant (generally requiring 140 ℃～160 ℃), because thick rubber products is the non-conductor of heat, the heat transfer programming rate is slow, so often in sulfuration process, cause the inhomogeneous of vulcanizing thick rubber products, simultaneously because room temperature (25 ℃) is bigger with the temperature difference of curing temperature, so need long sulfuration heat time heating time, have a strong impact on the production efficiency of thick rubber products, if so before vulcanizing thick rubber products, it is carried out preheating, its temperature is increased to 60 ℃～85 ℃, just can make thick rubber products before sulfuration temperature and the temperature difference between the curing temperature greatly reduce, can obviously improve sulfuration efficient, increase output, increase economic efficiency, thereby preheating has important practical significance before the vulcanizing thick rubber products.At present, the heating general using hot water of the sulfidation of thick rubber products or steam are as heat medium, exist above-mentioned heat transfer programming rate slow but utilize hot water, steam to heat thick rubber products, the uneven shortcoming of vulcanizing thick rubber products, production efficiency is lower.In existing sulfurization technology, also paid pilot production is heated thick rubber products with the mode of heating using microwave, but owing to often need to adopt the skeleton that is covered with wire bundle in the thick rubber products (for example tire), to keep shape of products and its rigidity, and the reflex of metal pair microwave makes wire bundle be easy to generate " sparking " phenomenon in microwave field, and burn out thick rubber products, percent defective is higher, so utilize microwave to come technical progress that thick rubber products is heated in sulfidation slow, yet there are no widespread usage.
Summary of the invention
The objective of the invention is to overcome the shortcoming of prior art, provide a kind of applied widely, efficiency of heating surface height can obviously shorten the time that thick rubber products heats in sulfidation, the method for preheating before the vulcanizing thick rubber products of effectively enhancing productivity.
Another object of the present invention is to provide a kind of preceding preheating device of vulcanizing thick rubber products of realizing said method.
A further object of the present invention is to provide a kind of application of said method.
Purpose of the present invention is achieved through the following technical solutions: the method for preheating is to adopt the mode of heating using microwave that thick rubber products is carried out preheating before this vulcanizing thick rubber products.
The concrete operations step of described heating using microwave is carried out the multiple spot energy regenerative for utilizing the low power microwave transmitter unit to thick rubber products.
Described low power microwave transmitter unit comprises magnetron, micro-wave coupler, fan, electric capacity, and magnetron and micro-wave coupler link together.
Described magnetron is the low power magnetrons of 2450MHz, 300W～900W.
Described multiple spot energy regenerative includes the action mode of up, down, left, right, before and after six direction energy regenerative; Also can only get the action mode of 2～5 direction energy regeneratives in the up, down, left, right, before and after direction according to the concrete shape of thick rubber products.
It is 4～50 that described each energy regenerative direction adopts the quantity of low power magnetrons; For this annular rubber thick product of tire, also can adopt and circumferentially be symmetrical arranged a plurality of low power magnetrons at it, carry out the action mode of energy regenerative as 4～80 low power magnetrons.
The adjusting of the watt level of described heating using microwave can realize by the quantity of microwave transmitter unit of control real work.
The intermittently action mode of heating for multiple times is adopted in described heating using microwave, and as stopping heating after heating a period of time, heating is once more carried out so repeatedly after placement a period of time; And different, specifically can test by experiment and draw by its optimum value with the difference of thick rubber products size and performance parameter for the time span that wherein heats and place.
Described heating using microwave specifically can be provided with the metallic reflection sheet as required increases or reduces microwave energy-feeding to the thick rubber products different parts.
Described increase microwave energy-feeding is by the metallic reflection sheet more microwave energy to be reflexed to thick rubber products need add the more position of heat (may produce the position of microwave shade as tire); Described minimizing microwave energy-feeding is by the metallic reflection sheet microwave energy to be reflexed to other direction to reduce the microwave energy that thick rubber products need add the less position of heat (position that wire is more as the longitudinal cross-section of tire is thin than thin part, cross section etc.).
The mode that described heating using microwave can be adopted independent heating as required or heat continuously.Described independent mode of heating is meant and adopts single microwave oven that thick rubber products is heated; The mode of described continuous heating is meant that adopting a plurality of microwave ovens to link together heats successively to the thick rubber products of carrying process; The number of microwave oven according to thick rubber products required add heat and determine heat time heating time, be generally 2～20.
A kind of preceding preheating device of vulcanizing thick rubber products of realizing said method, comprise body of heater, low power microwave transmitter unit, be provided with furnace chamber in the described body of heater, the low power microwave transmitter unit is arranged in the space between body of heater and the furnace chamber, and the microwave feed-in mouth of low power microwave transmitter unit is positioned on the furnace chamber wall.
Described microwave feed-in mouth is positioned on the wall of six aspects of up, down, left, right, before and after of furnace chamber wall; If furnace chamber is a polygon, as eight-sided formation, microwave feed-in mouth is distributed in respectively on a plurality of (as 8) furnace chamber wall of polygon (as 8 limit shapes) so.If furnace chamber is a circular configuration, microwave feed-in mouth is distributed on the circular furnace chamber wall and up and down on two walls axisymmetricly so.
The quantity of the microwave feed-in mouth that is provided with on the wall of each direction of described up, down, left, right, before and after six direction at the furnace chamber wall is 4～50; If furnace chamber is a circular configuration, the quantity at the microwave feed-in mouth of circular furnace chamber wall can be 4～80 so.
Be provided with rotating disk below the described furnace chamber, rotating disk is rotated by driven by motor, and placed thereon thick rubber products is rotated in the process of preheating continuously, heats more even.
A kind of preceding preheating device of vulcanizing thick rubber products of realizing said method, comprise body of heater, low power microwave transmitter unit, continuous conveying mechanism, described body of heater is provided with furnace chamber, continuous conveying mechanism is positioned at furnace chamber, the low power microwave transmitter unit is arranged on around the furnace chamber, and the microwave feed-in mouth of low power microwave transmitter unit is positioned on the furnace chamber wall.
Described body of heater is connected and composed by 2～30 branch bodies of heater that are interconnected, and body of heater all was provided with cavity in described minute, each minute the cavity of body of heater link together and constitute the furnace chamber of described body of heater.
Described continuous conveying mechanism is a transport trolley, under the transport trolley wheel is housed; Transport trolley can heat placed thereon thick rubber products along moving in the furnace chamber successively continuously through each low power microwave transmitter unit; Described transport trolley can adopt insulating microwave body material, makes as polytetrafluoroethylene (PTFE) etc., also can use metal to make, and adopting the transport trolley of metal material is as reflecting member with it.
Described continuous conveying mechanism also can be conveyer belt.
Above-mentioned thick rubber products can be tire, also can be the thicker rubber of size of other form.
The method of preheating and device can be applicable to the containing metal tow and reach the not rubber tyre of containing metal tow before this vulcanizing thick rubber products; Described rubber tyre can be automobile, motorcycle, the bicycle tyre of all size model.
The present invention compared with prior art has following advantage and effect:
(1) enhances productivity; The present invention has realized utilizing microwave to the whole preheating of thick rubber products before sulfuration, saved thick rubber products has been risen to 100 ℃ of these processes that consume most of heat time heating time by normal temperature in sulfuration process, can make the cure time of thick rubber products shorten more than 20%, thereby can improve the productivity ratio of vulcanizing thick rubber products effectively, thereby increase economic benefit significantly.
(2) thick rubber products that has overcome the containing metal tow heats the problem that exists; " sparking " phenomenon, percent defective higher (experimental data shows near 50%) time take place in thick rubber products heating that traditional microwave heating is applied to the containing metal tow easily; The inventive method is by the physicochemical principle of utilization microwave, adopt multiple effective measures such as low power microwave energy, multiple spot energy regenerative that the thick rubber products of containing metal tow is heated, the wire bundle that has overcome preferably in the thick rubber products produces the phenomenon of " sparking " under the effect of microwave field, greatly reducing percent defective, is below 2% through its percent defective of experimental verification.
(3) firing rate is fast, efficient is high, effective; Utilize the present invention that thick rubber products is vulcanized preceding preheating, just can evenly be warmed up to 40 ℃～90 ℃ to thick rubber products from normal temperature (20 ℃) in the time about 2～25 minutes; Through the thick rubber products of the inventive method preheating, internal and external temperature is even, the each point temperature difference ± 3 ℃; Utilize the present invention can help to improve vulcanization of rubber efficient and product quality.
(4) applied widely; The present invention can be applicable to various rubber tyre products and the thicker rubber of other size; Whether the containing metal tow all can use effectively regardless of thick rubber products, thereby applicable surface is wider, good market prospect.
Description of drawings
Fig. 1 is the structural representation of preheating device before the vulcanizing thick rubber products of the present invention.
Fig. 2 is the vertical view of device shown in Figure 1.
Fig. 3 is that the A-A of device shown in Figure 1 and B-B are to view.
Fig. 4 is that the C-C of device shown in Figure 2 and D-D are to view.
Fig. 5 is that the E-E of device shown in Figure 2 and F-F are to view.
Fig. 6 is the schematic diagram of another structure of preheating device before the vulcanizing thick rubber products of the present invention.
Fig. 7 is that the A-A of device shown in Figure 6 and B-B are to view.
Fig. 8 is that the C-C of device shown in Figure 7 and D-D are to view.
The specific embodiment
The present invention is described in further detail below in conjunction with embodiment and accompanying drawing, but embodiments of the present invention are not limited thereto.
Fig. 1～Fig. 5 shows one embodiment of the present invention, and preheating device is used for the preceding preheating of sulfurizing rubber tyre of containing metal tow before this vulcanizing thick rubber products; As seen from Figure 1, preheating device includes body of heater 1 before this vulcanizing thick rubber products, on the body of heater 1, the bottom is provided with humidity discharging pore 2, the gas that produces when being used for heating is discharged, body of heater all is provided with fire door 3 before and after the middle part, 4, before being provided with, latter two fire door 3,4 purposes are for the ease of putting into apace continuously, take out tire, in body of heater 1, be provided with furnace chamber 5, furnace chamber 5 cross sections are octagon, as shown in Figures 2 and 3, be provided with rotating disk 6 below the furnace chamber 5, rotating disk 6 is rotated by driven by motor, placed thereon tire is rotated in the process of preheating continuously, heat more even; Be provided with low power microwave transmitter unit 8 in the space between body of heater 1 and furnace chamber 5, low power microwave transmitter unit 8 comprises magnetron, fan, electric capacity, micro-wave coupler, described magnetron is the low power magnetrons of 2450MHz, 300W～900W, and the microwave feed-in mouth 9 of low power microwave transmitter unit 8 is positioned on furnace chamber 5 walls; Low power microwave transmitter unit 8 is distributed in around the furnace chamber 5, comprise upper and lower end face and circumferential eight sides, concrete quantity and distributing position such as Fig. 3～shown in Figure 5, wherein respectively be evenly distributed with 12 at upper and lower end face, its corresponding microwave feed-in mouth 9 is seen Fig. 3, the low power microwave transmitter unit 8 of each face is divided into a plurality of unit group as requested, duty by control panel 10 unified each unit group of control, as the group work of actuating section unit and the remaining element group is not worked or all the unit group start work together, thereby control different microwave output powers.
The preceding warm of the more small-sized tyre vulcanization that utilizes apparatus of the present invention to realize is: the tire below 1 meter that will be to be vulcanized fire door 3 is in the past sent in this device, fire door 3 before shutting; The appearance and size of pressing tire determines to use the quantity of microwave feed-in mouth 9, start rotating disk 6 (also can rely on the even microwave field of microwave feed-in mouth 9 outputs to realize that rotating disk 6 does not rotate), begin heating by control panel 10 control low power microwave transmitter units 8, best heating-up temperature is 55～85 ℃, finishing above-mentioned heating operation Best Times is 2.5～8 minutes, the best mode of heating is intermittently repeatedly to finish, as heated 1～2 minute, stopped to heat 0.5～1 minute, heated again 1～2 minute, and so repeated until finishing; After being heated to predetermined temperature, back fire door 4 is opened, tire is taken out, be placed on and be transported to tyre vulcanizer on the conveyer and carry out vulcanizing treatment, put into the tire that the next one is treated preheating by preceding fire door 3 simultaneously, repeat abovementioned steps again and handle from back fire door 4.
The preceding warm of the relatively large tyre vulcanization that utilizes apparatus of the present invention to realize is: the tire more than 1 meter that will be to be vulcanized fire door 3 is in the past sent in this device, fire door 3 before shutting; The appearance and size of pressing tire determines to use the quantity of microwave feed-in mouth 9, from the even microwave field of microwave feed-in mouth 9 outputs tire is heated (rotating disk 6 can not rotate) by control panel 10 control low power microwave transmitter units 8, best heating-up temperature is 55～85 ℃, finishing above-mentioned heating operation Best Times is 8～20 minutes, the best mode of heating is intermittently repeatedly to finish, as heats 2～4 minutes, stops to heat 0.5～1 minute, heated again 2～4 minutes, and so repeated until finishing; After being heated to predetermined temperature, back fire door 4 is opened, tire is taken out, be placed on and be transported to tyre vulcanizer on the conveyer and carry out vulcanizing treatment, put into the tire that the next one is treated preheating by preceding fire door 3 simultaneously, repeat abovementioned steps again and handle from back fire door 4.
Fig. 6～Fig. 8 shows another embodiment of the invention, and preheating device is used for containing metal tow or the not preceding preheating of sulfurizing rubber tyre of containing metal tow before this vulcanizing thick rubber products; As seen from Figure 6, preheating device comprises body of heater 1, low power microwave transmitter unit 8, transport trolley 11 before this vulcanizing thick rubber products, body of heater 1 is connected and composed by 6～20 branch body of heater 1-1 that are interconnected, body of heater 1-1 was provided with cavity 5-1 in described minute, and the cavity 5-1 of each minute body of heater 1-1 links together and constitutes the furnace chamber 5 of described body of heater 1; Be provided with transport trolley 11 in the furnace chamber 5, transport trolley 11 adopts polytetrafluoroethylene (PTFE) or metal material to make, and wheel is housed below it, can be along moving in the furnace chamber 5; Low power microwave transmitter unit 8 be arranged on furnace chamber 5 on, down, before, outside the back, the microwave feed-in mouth 9 of low power microwave transmitter unit 8 is positioned on the furnace chamber 5 wall faces, particular location structure such as Fig. 7～shown in Figure 8, by Fig. 7～Fig. 8 as seen, each microwave feed-in mouth 9 quantity (being the quantity of low power microwave transmitter unit 8) of dividing body of heater 1-1 to be provided with is 14, the low power microwave transmitter unit 8 of each face is divided into a plurality of unit group as requested, duty by each unit group of the unified control of control system, as the group work of actuating section unit and the remaining element group is not worked or all the unit group start work together, thereby control different microwave output powers.
The preceding warm of the tyre vulcanization that utilizes apparatus of the present invention to realize is: tire that will be to be vulcanized is sent into the furnace chamber 5 from an end of body of heater 1 through putting transport trolley 11; Transport trolley 11 moves in furnace chamber 5 with the speed (optimal transport is 1.5～5 meters of per minutes) of 1～10 meter of per minute, in the process that moves, low power microwave transmitter unit 8 around the furnace chamber 5 heats tire continuously by microwave feed-in mouth 9, utilize each to divide connection space between body of heater 1-1 simultaneously, realize intermittently mode of heating repeatedly as heating using microwave point intermittently; In heating process, can also regulate the group number of in running order low power microwave transmitter unit 8 in real time according to actual temperature by control system, thereby control the heating-up temperature of tire; When transport trolley 11 was transported to the other end of furnace chamber 5 with tire, heating finished, and this moment, tire reached required heating-up temperature; Generally speaking, tire carries out The pre-heat treatment in apparatus of the present invention only needed to finish in 3～10 minutes.Because this device adopts processed continuously mode to carry out the tire preheating,, can be applicable in extensive, the large batch of rubber tyre manufacturing so treating capacity is big, efficient is high.
Claims (18)
1, the method for preheating before a kind of vulcanizing thick rubber products is characterized in that: adopt microwave heating that thick rubber products is carried out preheating.
2, the method for preheating before the vulcanizing thick rubber products according to claim 1, it is characterized in that: described microwave heating carries out the multiple spot energy regenerative for utilizing the low power microwave transmitter unit to thick rubber products.
3, the method for preheating before the vulcanizing thick rubber products according to claim 2, it is characterized in that: the magnetron in the described low power microwave transmitter unit is the low power magnetrons of 2450MHz, 300W～900W.
4, the method for preheating before the vulcanizing thick rubber products according to claim 2, it is characterized in that: described multiple spot energy regenerative is the action mode of up, down, left, right, before and after six direction energy regenerative; Also can only get the action mode of 2～5 direction energy regeneratives in the up, down, left, right, before and after direction.
5, the method for preheating before the vulcanizing thick rubber products according to claim 4 is characterized in that: it is 4～50 that described each energy regenerative direction adopts the quantity of low power magnetrons.
6, the method for preheating before the vulcanizing thick rubber products according to claim 1 is characterized in that: the intermittently action mode of heating for multiple times is adopted in described heating using microwave.
7, the method for preheating before the vulcanizing thick rubber products according to claim 1 is characterized in that: described microwave heating process is provided with the metallic reflection sheet increases or reduces microwave energy-feeding to the thick rubber products different parts.
8, the method for preheating before the vulcanizing thick rubber products according to claim 7, it is characterized in that: described increase microwave energy-feeding is by the metallic reflection sheet more microwave energy to be reflexed to thick rubber products need add the more position of heat; Described minimizing microwave energy-feeding is by the metallic reflection sheet microwave energy to be reflexed to other direction to reduce the microwave energy that thick rubber products need add the less position of heat.
9, the method for preheating before the vulcanizing thick rubber products according to claim 1 is characterized in that: the mode of heating separately or continuous heating is adopted in described heating using microwave.
10, the method for preheating before the vulcanizing thick rubber products according to claim 9 is characterized in that: described independent mode of heating is meant and adopts single microwave oven that thick rubber products is heated; The mode of described continuous heating is meant that adopting a plurality of microwave ovens to link together heats successively to the thick rubber products of carrying process.
11, preheating device before a kind of vulcanizing thick rubber products, it is characterized in that: comprise body of heater, low power microwave transmitter unit, be provided with furnace chamber in the described body of heater, the low power microwave transmitter unit is arranged in the space between body of heater and the furnace chamber, and the microwave feed-in mouth of low power microwave transmitter unit is positioned on the furnace chamber wall.
12, preheating device before the vulcanizing thick rubber products according to claim 11 is characterized in that: described microwave feed-in mouth is positioned on the wall of six aspects of up, down, left, right, before and after of furnace chamber wall.
13, preheating device before the vulcanizing thick rubber products according to claim 12 is characterized in that: the quantity of the microwave feed-in mouth that is provided with on the wall of each direction of described up, down, left, right, before and after six direction at the furnace chamber wall is 4～50; If furnace chamber is a circular configuration, the quantity at the microwave feed-in mouth of circular furnace chamber wall is 4～60 so.
14, preheating device before a kind of vulcanizing thick rubber products, it is characterized in that: comprise body of heater, low power microwave transmitter unit, continuous conveying mechanism, described body of heater is provided with furnace chamber, continuous conveying mechanism is positioned at furnace chamber, the low power microwave transmitter unit is arranged on around the furnace chamber, and the microwave feed-in mouth of low power microwave transmitter unit is positioned on the furnace chamber wall.
15, preheating device before the vulcanizing thick rubber products according to claim 14, it is characterized in that: described body of heater is connected and composed by 2～30 branch bodies of heater that are interconnected, body of heater was provided with cavity in described minute, each minute the cavity of body of heater link together and constitute the furnace chamber of described body of heater.
16, preheating device before the vulcanizing thick rubber products according to claim 14, it is characterized in that: described continuous conveying mechanism is a transport trolley, under the transport trolley wheel is housed.
17, preheating device before the vulcanizing thick rubber products according to claim 14, it is characterized in that: described continuous conveying mechanism is a conveyer belt.
18, the application of pre-heating mean before a kind of vulcanizing thick rubber products is characterized in that: be applied to the containing metal tow or the thick rubber products of containing metal tow not.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB031399266A CN100361798C (en) | 2003-07-24 | 2003-07-24 | Method and device for preheating thick rubber products before vulcanizatcion and use thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB031399266A CN100361798C (en) | 2003-07-24 | 2003-07-24 | Method and device for preheating thick rubber products before vulcanizatcion and use thereof |
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| CN1483564A true CN1483564A (en) | 2004-03-24 |
| CN100361798C CN100361798C (en) | 2008-01-16 |
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| CNB031399266A Expired - Fee Related CN100361798C (en) | 2003-07-24 | 2003-07-24 | Method and device for preheating thick rubber products before vulcanizatcion and use thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102211401A (en) * | 2010-04-09 | 2011-10-12 | 深圳市沃尔核材股份有限公司 | Pipe expanding device |
| CN102431757A (en) * | 2011-12-14 | 2012-05-02 | 三角轮胎股份有限公司 | Fully automatic tyre blank storage stereoscopic bin |
| WO2012103690A1 (en) * | 2011-02-02 | 2012-08-09 | 佛山惠幅化工有限公司 | Microwave continuous rubber vulcanization and foaming system |
| CN105583979A (en) * | 2016-03-16 | 2016-05-18 | 浙江润阳新材料科技股份有限公司 | Horizontally-arranged foaming furnace |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3927291A (en) * | 1973-06-29 | 1975-12-16 | Raytheon Co | Reduced speed compensator for microwave heating applicator |
| JPH04224831A (en) * | 1990-12-27 | 1992-08-14 | Kinugawa Rubber Ind Co Ltd | Production of rubber foam |
| CN1163339C (en) * | 2000-03-15 | 2004-08-25 | 华南理工大学 | Temp-varying heating process for vulcanizing thick rubber products and its intelligent control system |
| CN1422670A (en) * | 2001-11-23 | 2003-06-11 | 王武生 | Method and apparatus for eliminating anthracine in mails |
| CN2631732Y (en) * | 2003-07-24 | 2004-08-11 | 华南理工大学 | Continuous preheating device for vulcanization of rubber thick products |
| CN2631728Y (en) * | 2003-07-24 | 2004-08-11 | 华南理工大学 | Preheating device for vulcanization of rubber thick products |
-
2003
- 2003-07-24 CN CNB031399266A patent/CN100361798C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102211401A (en) * | 2010-04-09 | 2011-10-12 | 深圳市沃尔核材股份有限公司 | Pipe expanding device |
| WO2012103690A1 (en) * | 2011-02-02 | 2012-08-09 | 佛山惠幅化工有限公司 | Microwave continuous rubber vulcanization and foaming system |
| CN102431757A (en) * | 2011-12-14 | 2012-05-02 | 三角轮胎股份有限公司 | Fully automatic tyre blank storage stereoscopic bin |
| CN105583979A (en) * | 2016-03-16 | 2016-05-18 | 浙江润阳新材料科技股份有限公司 | Horizontally-arranged foaming furnace |
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Application publication date: 20040324 Assignee: Guangzhou Mingjun Balflex Rubber Co., Ltd. Assignor: South China University of Technology Contract record no.: 2010440000424 Denomination of invention: Method and device for preheating thick rubber products before vulcanizatcion and use thereof Granted publication date: 20080116 License type: Exclusive License Record date: 20100422 |
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