CN110718673A - Power polymer lithium battery tab hot press - Google Patents
Power polymer lithium battery tab hot press Download PDFInfo
- Publication number
- CN110718673A CN110718673A CN201810764997.6A CN201810764997A CN110718673A CN 110718673 A CN110718673 A CN 110718673A CN 201810764997 A CN201810764997 A CN 201810764997A CN 110718673 A CN110718673 A CN 110718673A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
- H01M4/043—Processes of manufacture in general involving compressing or compaction
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
- H01M4/0471—Processes of manufacture in general involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/24—Electrodes for alkaline accumulators
- H01M4/26—Processes of manufacture
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
The invention relates to a power polymer lithium battery tab hot press machine which comprises a plurality of tab hot pressing units, wherein each tab hot pressing unit comprises an upper pressing die, a lower pressing die and a hot pressing driving device. Go up the moulding-die and include utmost point ear glue hot pressboard A, utmost point ear strap hot pressboard A, be equipped with utmost point ear strap mounting groove A on utmost point ear glue hot pressboard A's the hot pressing surface, utmost point ear strap hot pressboard A's both ends are equipped with electrothermal tube A. The lower pressing die comprises a lug glue hot pressing plate B and a lug metal belt hot pressing plate B, wherein a lug metal belt mounting groove B is formed in the hot pressing surface of the lug glue hot pressing plate B, and electric heating tubes B are arranged at two ends of the lug metal belt hot pressing plate B. The invention adopts a two-stage simultaneous heating mode aiming at the metal strip of the tab and the tab glue to improve the fusion bonding effect, and has the characteristics of high hot-pressing processing efficiency and high quality.
Description
Technical Field
The invention relates to a power polymer lithium battery tab hot press, in particular to a power polymer lithium battery tab hot press with improved hot pressing quality, and belongs to the field of tab hot presses.
Background
The upper and lower heating pressing blocks of the existing equipment are integral non-divisible areas. When the upper heating block and the lower heating block are locally pressed in a linkage manner by the upper heating block and the lower heating block, the temperature is firstly transferred to the tab glue, then the tab glue is used for transferring heat to the metal belt, and only when the temperature of the outer surface of the metal belt exceeds the melting point of the tab glue, the bonding between the tab glue and the metal belt and the fusion bonding of the two layers of tab glue can be completed under certain pressure. The hot pressing mode is a mode of heat transfer from outside to inside, so the temperature adjustable range of the hot pressing process is small, the hot pressing process is not easy to control, the tab glue is extremely easy to be over-melted, and the peeling strength between the glue and the metal belt is low for the pressed power tab. Meanwhile, the heating time of heat transfer and heating objects is long, the temperature of the end socket directly pressed on the tab glue is higher than the melting point of the tab glue, and the tab glue is seriously deformed in the long-time heating heat transfer and pressing process, so that the overall size and appearance are influenced. If the temperature is lowered, the hot pressing time is prolonged and the efficiency is lowered.
Disclosure of Invention
The invention discloses a novel scheme for a power polymer lithium battery tab hot press, which improves the fusion bonding effect by adopting a two-stage simultaneous heating mode aiming at a tab metal belt and tab glue and solves the problem caused by adopting a single mode of heating the tab glue for heat transfer in the conventional scheme.
The invention discloses a power polymer lithium battery tab hot press machine which comprises a plurality of tab hot pressing units, wherein each tab hot pressing unit comprises an upper pressing die, a lower pressing die and a hot pressing driving device. Go up the moulding-die and include utmost point ear glue hot pressboard A, utmost point ear strap hot pressboard A, be equipped with utmost point ear strap mounting groove A on utmost point ear glue hot pressboard A's the hot-pressing surface, utmost point ear strap hot pressboard A's both ends are equipped with electrothermal tube A, electrothermal tube A's heat transfer end stretches into from utmost point ear strap mounting groove A's tip and forms heat transfer contact with utmost point ear strap and be connected. The lower pressing die comprises a lug adhesive hot pressing plate B and a lug metal belt hot pressing plate B, wherein a lug metal belt mounting groove B is formed in the hot pressing surface of the lug adhesive hot pressing plate B, electric heating tubes B are arranged at two ends of the lug metal belt hot pressing plate B, and the heat transfer ends of the electric heating tubes B extend into the lug metal belt mounting groove B from the end parts of the lug metal belt mounting groove B to form heat transfer contact connection with the lug metal belt. The hot pressing driving device drives the upper pressing die to press downwards and form hot press fit with the lower pressing die, and the lug glue A on the hot pressing surface of the lug glue hot pressing plate A and the lug glue B on the hot pressing surface of the lug glue hot pressing plate B are used for hot press fitting of the lug metal belt in the lug metal belt placing space formed by matching the lug metal belt placing groove A and the lug metal belt placing groove B to form the whole lug.
Furthermore, a porous ceramic heat insulation layer is arranged between the heat transfer end of the electric heating tube A and the lug glue hot pressing plate A, a porous ceramic heat insulation layer is arranged between the heat transfer end of the electric heating tube B and the lug glue hot pressing plate B, and the porous ceramic heat insulation layer prevents heat transfer between the heat transfer end of the electric heating tube and the lug glue hot pressing plate.
Further, a plurality of heat conducting liquid pipelines are arranged in the lug glue hot pressing plate A and the lug glue hot pressing plate B, the heat conducting liquid pipelines are communicated with the heat conducting liquid circulating chamber in a sealing mode, a constant temperature device is arranged in the heat conducting liquid circulating chamber, and the temperature of the lug glue hot pressing plate A and the temperature of the lug glue hot pressing plate B are kept within a set range through heat conducting liquid flowing in a circulating mode.
Furthermore, the tab hot-pressing unit of the present invention further comprises a hot-pressing automatic control system, the hot-pressing automatic control system comprises a tab adhesive hot-pressing plate temperature control module, a tab metal band hot-pressing plate temperature control module, a hot-pressing driving device control module, the tab adhesive hot-pressing plate temperature control module ensures that the hot-pressing temperature of the tab adhesive hot-pressing plate heated by the heat conducting liquid is within a set range by adjusting the temperature of the thermostat, the tab metal band hot-pressing plate temperature control module adjusts the heating temperature of the electric heating tube a and the heating temperature of the electric heating tube B according to the temperature signal of the tab metal band fed back by the temperature sensor arranged in the tab metal band placing space, and the hot-pressing driving device control module controls the hot-pressing driving device to drive the upper pressing die to press down and the lower.
Further, the hot pressing driving device of this scheme includes hydraulic means, goes up the moulding-die and still includes the base plate, and the base plate passes through the base plate connecting plate to be connected with utmost point ear strap hot pressing board A, and hydraulic means's output promotes that the base plate links utmost point ear and glues hot pressing board A, utmost point ear strap hot pressing board A and pushes down and form hot press fit with the moulding-down.
The hot press for the power polymer lithium battery tab improves the fusion bonding effect by adopting a two-stage simultaneous heating mode aiming at the tab metal belt and the tab glue, and has the characteristics of high hot pressing efficiency and high quality.
Drawings
FIG. 1 is a schematic diagram of a dynamic polymer lithium battery tab hot press.
Fig. 2 is a schematic view of a tab hot-pressing unit.
Fig. 3 is a schematic sectional view of a tab hot-pressing unit.
Fig. 4 is a schematic view of a tab glue hot press plate.
Fig. 5 is a schematic cross-sectional view of a tab glue hot press plate.
Fig. 6 is a partially enlarged schematic view of a nip where the upper and lower press dies are thermally press-fitted.
Wherein, 100 is an upper pressing die, 110 is a tab glue hot-pressing plate A, 120 is a tab metal band hot-pressing plate A, 121 is an electrothermal tube A, 130 is a substrate, 140 is a substrate connecting plate, 200 is a lower pressing die, 210 is a tab glue hot-pressing plate B, 211 is a tab metal band mounting groove B, 220 is a tab metal band hot-pressing plate B, 221 is an electrothermal tube B, 300 is a hot-pressing driving device, 400 is a tab metal band, 500 is a tab glue, 610 is a porous ceramic heat-insulating layer, 620 is a heat-conducting liquid pipeline, and 630 is a heat-conducting liquid circulating chamber.
Detailed Description
As shown in figures 1-4, the power polymer lithium battery tab hot press machine comprises a plurality of tab hot pressing units, wherein each tab hot pressing unit comprises an upper pressing die, a lower pressing die and a hot pressing driving device. Go up the moulding-die and include utmost point ear glue hot pressboard A, utmost point ear strap hot pressboard A, be equipped with utmost point ear strap mounting groove A on utmost point ear glue hot pressboard A's the hot-pressing surface, utmost point ear strap hot pressboard A's both ends are equipped with electrothermal tube A, electrothermal tube A's heat transfer end stretches into from utmost point ear strap mounting groove A's tip and forms heat transfer contact with utmost point ear strap and be connected. The lower pressing die comprises a lug adhesive hot pressing plate B and a lug metal belt hot pressing plate B, wherein a lug metal belt mounting groove B is formed in the hot pressing surface of the lug adhesive hot pressing plate B, electric heating tubes B are arranged at two ends of the lug metal belt hot pressing plate B, and the heat transfer ends of the electric heating tubes B extend into the lug metal belt mounting groove B from the end parts of the lug metal belt mounting groove B to form heat transfer contact connection with the lug metal belt. The hot pressing driving device drives the upper pressing die to press downwards and form hot press fit with the lower pressing die, and the lug glue A on the hot pressing surface of the lug glue hot pressing plate A and the lug glue B on the hot pressing surface of the lug glue hot pressing plate B are used for hot press fitting of the lug metal belt in the lug metal belt placing space formed by matching the lug metal belt placing groove A and the lug metal belt placing groove B to form the whole lug. Above-mentioned scheme adopts to improve to fuse the bonding effect to the two-stage concurrent heating mode that utmost point ear strap and utmost point ear glued, specifically adopts the electrothermal tube to heat up utmost point ear strap earlier to the temperature that melts utmost point ear glue for utmost point ear strap and utmost point ear glue form high-quality hot melt bonding, and upper and lower two-stage utmost point ear glue hot pressboard glues the hot pressing with both sides utmost point ear glue simultaneously and bonds formation utmost point ear overall bonding structure, and hot pressing process time is short, has improved the machining efficiency and the quality of hot pressing by a wide margin.
In order to avoid the heat transfer between the electrothermal tube and the tab adhesive hot pressing plate, as shown in fig. 6, a porous ceramic heat insulation layer is arranged between the heat transfer end of the electrothermal tube a and the tab adhesive hot pressing plate a, and a porous ceramic heat insulation layer is arranged between the heat transfer end of the electrothermal tube B and the tab adhesive hot pressing plate B, and the porous ceramic heat insulation layer prevents the heat transfer between the heat transfer end of the electrothermal tube and the tab adhesive hot pressing plate.
In order to realize the hot-pressing temperature control of the tab adhesive hot-pressing plate, as shown in fig. 5, a plurality of heat-conducting liquid pipelines are arranged in the tab adhesive hot-pressing plate a and the tab adhesive hot-pressing plate B, the heat-conducting liquid pipelines are hermetically communicated with a heat-conducting liquid circulation chamber, a constant temperature device is arranged in the heat-conducting liquid circulation chamber, and the temperature of the tab adhesive hot-pressing plate a and the tab adhesive hot-pressing plate B is kept within a set range by the heat-conducting liquid which flows circularly.
Based on the scheme, in order to realize the two-stage temperature control of the lug hot press, the heating temperature is set according to the specific material of the lug metal belt and the lug glue, the lug hot press unit of the scheme also comprises a hot press automatic control system, the hot press automatic control system comprises a lug glue hot press plate temperature control module, a lug metal belt hot press plate temperature control module and a hot press driving device control module, the lug glue hot press plate temperature control module ensures that the hot press temperature of the lug glue hot press plate heated by heat-conducting liquid is in a set range by adjusting the temperature of a constant temperature device, the lug metal belt hot press plate temperature control module adjusts the heating temperature of the electric heating tubes A and B according to the temperature signal of the lug metal belt fed back by a temperature sensor arranged, and the hot-pressing driving device control module controls the hot-pressing driving device to drive the upper pressing die to press downwards and the lower pressing die to form hot press fit according to a set instruction, and then the hot press fit state is kept in a set hot press time period.
In order to realize the transmission connection of the driving device, the hot-pressing driving device comprises a hydraulic device, the upper pressing die further comprises a substrate, the substrate is connected with the lug metal belt hot-pressing plate A through a substrate connecting plate, and the output end of the hydraulic device pushes the substrate to be linked with the lug glue hot-pressing plate A and the lug metal belt hot-pressing plate A to be pressed down and pressed down by the pressing die to form hot press fit.
The scheme discloses a hot pressing process for tab glue on a power polymer lithium battery tab, which is characterized in that a metal belt of a tab and the tab glue are heated in two stages in different areas, the metal belt of the tab is heated to the melting temperature of the tab glue according to the temperature and the characteristics of different tab glues, and meanwhile, the placement area of the tab glue can be controlled, so that the tab is not over-melted. The power polymer lithium battery tab pressed in the way has high peeling strength between the tab glue and the tab metal belt, and the tab glue is not melted, so that the quality of the power polymer lithium battery tab is greatly improved.
The scheme adopts a mode of heating pressing block temperature control in a region, and the temperature is regulated and controlled according to the temperature characteristics of different tab glue, so that the peel strength between the pressed power tab glue and the metal belt is obviously improved. The tab glue placing area of the heating pressing block is controlled by an independent temperature controller. The temperature of the area where the tab metal strip is placed is controlled by a temperature sensor directly arranged on the heating block. Two areas (a tab glue placing area and a tab metal belt placing area) of the whole heating block are respectively regulated and controlled by two independent heating control units. Therefore, the metal band can be heated to the melting point temperature of the tab glue, the contact surface of the tab glue and the tab metal band is firstly melted, and then the heating pressing block is used for pressing the tab glue and the tab metal band by proper pressure to solidify the tab glue and the tab metal band. The hot pressing mode is a heat transfer mode from inside to outside. The hot pressing process has a large temperature adjustable range, and the peel strength between the pressed tab glue and the metal belt is high. The heating area of utmost point ear strap in this scheme power utmost point ear briquetting machine adopts the electric heating pipe heating to be controlled temperature regulation by temperature sensor. The tab glue heating area in the power tab pressing machine adopts liquid heating circulation heat conduction control, heat is transferred to reach the required temperature through heating heat conduction liquid circulation, and the heat conduction liquid circulates to the heat conduction block of the tab glue heating area to play a role in regulating and controlling the temperature of the heat conduction block of the tab glue heating area.
Based on the content and the characteristics, compared with the existing similar products, the power polymer lithium battery tab hot press has the outstanding substantive characteristics and the obvious progress.
The hot press for the tabs of the power polymer lithium battery is not limited to the disclosure in the specific embodiment, the technical solutions presented in the examples can be extended based on the understanding of those skilled in the art, and the simple alternatives made by those skilled in the art according to the present solution in combination with common knowledge also belong to the scope of the present solution.
Claims (5)
1. A power polymer lithium battery tab hot press machine is characterized by comprising a plurality of tab hot pressing units, wherein each tab hot pressing unit comprises an upper pressing die, a lower pressing die and a hot pressing driving device,
the upper pressing die comprises a tab adhesive hot-pressing plate A and a tab metal belt hot-pressing plate A, wherein a tab metal belt mounting groove A is arranged on the hot-pressing surface of the tab adhesive hot-pressing plate A, electric heating tubes A are arranged at two ends of the tab metal belt hot-pressing plate A, the heat transfer ends of the electric heating tubes A extend into the tab metal belt mounting groove A from the end parts of the tab metal belt mounting groove A to form heat transfer contact connection with the tab metal belt,
the lower pressing die comprises a lug glue hot pressing plate B and a lug metal belt hot pressing plate B, a lug metal belt mounting groove B is arranged on the hot pressing surface of the lug glue hot pressing plate B, electric heating tubes B are arranged at two ends of the lug metal belt hot pressing plate B, heat transfer ends of the electric heating tubes B extend into the lug metal belt mounting groove B from the end parts of the lug metal belt mounting groove B to form heat transfer contact connection with the lug metal belt,
the hot pressing drive device drives the upper pressing die to press downwards and the lower pressing die forms a hot press fit, tab glue A on the hot pressing surface of the tab glue hot pressing plate A and tab glue B on the hot pressing surface of the tab glue hot pressing plate B are to be established by the tab metal strip mounting groove A and the tab metal strip in the tab metal strip mounting space formed by the cooperation of the tab metal strip mounting groove B form the whole tab.
2. The power polymer lithium battery tab hot press machine of claim 1, wherein a porous ceramic thermal insulation layer is arranged between the heat transfer end of the electrothermal tube A and the tab glue hot press plate A, and a porous ceramic thermal insulation layer is arranged between the heat transfer end of the electrothermal tube B and the tab glue hot press plate B, and the porous ceramic thermal insulation layer prevents the heat transfer between the heat transfer end of the electrothermal tube and the tab glue hot press plate.
3. The dynamic polymer lithium battery tab hot press machine according to claim 1, wherein a plurality of heat conducting liquid pipelines are arranged in the tab adhesive hot pressing plate A and the tab adhesive hot pressing plate B, the heat conducting liquid pipelines are hermetically communicated with a heat conducting liquid circulating chamber, a constant temperature device is arranged in the heat conducting liquid circulating chamber, and the temperature of the tab adhesive hot pressing plate A and the temperature of the tab adhesive hot pressing plate B are kept within a set range by the circularly flowing heat conducting liquid.
4. The dynamic polymer lithium battery tab hot press as claimed in claim 3, the tab hot-pressing unit also comprises a hot-pressing automatic control system, the hot-pressing automatic control system comprises a tab glue hot-pressing plate temperature control module, a tab metal belt hot-pressing plate temperature control module and a hot-pressing driving device control module, the temperature control module of the tab glue hot-pressing plate ensures that the hot-pressing temperature of the tab glue hot-pressing plate heated by the heat-conducting liquid is in a set range by adjusting the temperature of the constant temperature device, the temperature control module of the hot-pressing plate for the lug metal belt adjusts the heating temperature of the electric heating tube A and the electric heating tube B according to the temperature signal of the lug metal belt fed back by the temperature sensor arranged in the placing space of the lug metal belt, and the hot-pressing driving device control module controls the hot-pressing driving device to drive the upper pressing die to press down and the lower pressing die to form hot press fit according to a set instruction, and then the hot-pressing driving device control module keeps a hot press fit state in a set hot-pressing time period.
5. The dynamic polymer lithium battery tab hot press machine as claimed in claim 1, wherein the hot press driving device comprises a hydraulic device, the upper press die further comprises a substrate, the substrate is connected with the tab metal band hot press plate a through a substrate connecting plate, and the output end of the hydraulic device pushes the substrate to link the tab adhesive hot press plate a, the tab metal band hot press plate a to press down and the lower press die to form a hot press fit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810764997.6A CN110718673B (en) | 2018-07-12 | 2018-07-12 | Power polymer lithium battery tab hot press |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810764997.6A CN110718673B (en) | 2018-07-12 | 2018-07-12 | Power polymer lithium battery tab hot press |
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| Publication Number | Publication Date |
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| CN110718673A true CN110718673A (en) | 2020-01-21 |
| CN110718673B CN110718673B (en) | 2021-06-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810764997.6A Active CN110718673B (en) | 2018-07-12 | 2018-07-12 | Power polymer lithium battery tab hot press |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1602249A (en) * | 2001-10-31 | 2005-03-30 | 波音公司 | Compact hot press |
| CN201077113Y (en) * | 2007-07-24 | 2008-06-25 | 信阳木工机械有限责任公司 | Composite hot pressing plate of hot press |
| JP2014143051A (en) * | 2013-01-23 | 2014-08-07 | Nippon Light Metal Co Ltd | Manufacturing method of tab lead member |
| CN104393226A (en) * | 2014-12-10 | 2015-03-04 | 连云港德立信电子科技有限公司 | Lithium battery tab hot press molding method |
| CN205900720U (en) * | 2016-07-06 | 2017-01-18 | 江苏北新能源科技有限公司 | Lithium ion battery electrode lug sealing device |
| CN108091813A (en) * | 2017-12-28 | 2018-05-29 | 深圳名飞远科技有限公司 | Power battery positions heating arrangements and lug hot briquetting method with lug metal tape |
-
2018
- 2018-07-12 CN CN201810764997.6A patent/CN110718673B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1602249A (en) * | 2001-10-31 | 2005-03-30 | 波音公司 | Compact hot press |
| CN201077113Y (en) * | 2007-07-24 | 2008-06-25 | 信阳木工机械有限责任公司 | Composite hot pressing plate of hot press |
| JP2014143051A (en) * | 2013-01-23 | 2014-08-07 | Nippon Light Metal Co Ltd | Manufacturing method of tab lead member |
| CN104393226A (en) * | 2014-12-10 | 2015-03-04 | 连云港德立信电子科技有限公司 | Lithium battery tab hot press molding method |
| CN205900720U (en) * | 2016-07-06 | 2017-01-18 | 江苏北新能源科技有限公司 | Lithium ion battery electrode lug sealing device |
| CN108091813A (en) * | 2017-12-28 | 2018-05-29 | 深圳名飞远科技有限公司 | Power battery positions heating arrangements and lug hot briquetting method with lug metal tape |
Non-Patent Citations (1)
| Title |
|---|
| 吴新泉等: "《人造板多层热压机》", 31 August 1985, 北京：中国林业出版社 * |
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