CN113235323B - Full paper-plastic zero-degree drawing production process - Google Patents
Full paper-plastic zero-degree drawing production process Download PDFInfo
- Publication number
- CN113235323B CN113235323B CN202110425784.2A CN202110425784A CN113235323B CN 113235323 B CN113235323 B CN 113235323B CN 202110425784 A CN202110425784 A CN 202110425784A CN 113235323 B CN113235323 B CN 113235323B
- Authority
- CN
- China
- Prior art keywords
- pulp
- die
- hot pressing
- suction
- mold
- 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.)
- Active
Links
Images
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
- D21H11/12—Pulp from non-woody plants or crops, e.g. cotton, flax, straw, bagasse
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21J—FIBREBOARD; MANUFACTURE OF ARTICLES FROM CELLULOSIC FIBROUS SUSPENSIONS OR FROM PAPIER-MACHE
- D21J5/00—Manufacture of hollow articles by transferring sheets, produced from fibres suspensions or papier-mâché by suction on wire-net moulds, to couch-moulds
Abstract
A zero-degree drawing production process of all paper-plastic comprises the following steps; step one, pulping; step two, primary pulp suction; providing a pulp sucking mould, wherein the pulp sucking mould can form a primary pulp layer; step three, secondary pulp suction; step four, extruding for the first time; providing an extrusion die, wherein the extrusion die is arranged above a pulp suction die, and the pulp suction die is pressed with the extrusion die to extrude the pulp layer to form a primary blank; fifthly, absorbing pulp for three times; step six, performing secondary extrusion to form a wet blank; step seven, hot-pressing and drying: providing a hot pressing die, wherein the hot pressing die comprises a lower hot pressing die and an upper hot pressing die, and a wet blank is absorbed and transferred onto the lower hot pressing die by a slurry absorption die; pressing the lower hot pressing die and the upper hot pressing die, and forming a paper-plastic product after hot pressing for a certain time; and step eight, transferring to receive materials. The production process of the invention can not only reduce the poor quality of products such as pulling crack, slurry pushing and the like, but also improve the precision of the products, so that the products are more smooth to demould, the surfaces of the products are more uniform and smooth, and the appearance effect is better; the practicability is strong, and the popularization significance is strong.
Description
Technical Field
The invention relates to a production process, in particular to a full paper-plastic zero-degree drawing production process.
Background
With the development of human economy and social economy, the environment is more concerned by the aspirations in all industries in the society at present, the environmental protection becomes a great social issue, the fine pulp molded product is produced by combining a new process according to the characteristics of the current packaging industry, and the environment-friendly pulp molded product is developed vigorously under the encouragement of national policies and the drive of the industry.
However, the conventional paper head molding products have the following disadvantages in the production process: 1. both the mould and the paper pulp have the phenomena of expansion with heat and contraction with cold in the hot pressing process, and the problem of difficult demoulding after the hot pressing process; in order to facilitate the drawing, a drawing angle is usually set to be larger, however, the drawing angle is larger, which results in low product precision and large adaptive clearance. In order to solve the problems, the problems of slurry pushing, pulling crack and the like of the product caused by small film drawing angle can be caused only by simply reducing the drawing angle.
Disclosure of Invention
Therefore, the invention aims to provide a zero-degree drawing production process for all-paper-plastic, which aims to solve the problems of large drawing angle, low precision, difficult demoulding, pulp pushing and pulling crack in the traditional production of all-paper-plastic.
A novel production process method of a full paper-plastic zero-degree drawing die comprises the following steps;
step one, pulping; placing bamboo pulp fiber, sugarcane fiber and wood pulp fiber into a pulp tank, crushing, stirring and fully mixing;
step two, primary pulp suction; providing a pulp suction mold, wherein the pulp suction mold is provided with an adsorption surface, and the pulp suction mold attaches the pulp prepared in the step one to the adsorption surface to form a pulp layer;
step three, secondary pulp suction; and after the primary pulp suction is finished, the pulp suction mold performs secondary pulp suction in the pulp pool.
Step four, extruding for the first time; providing an extrusion die, wherein the extrusion die is arranged above a pulp suction die, after secondary pulp suction is finished, the pulp suction die is lifted upwards and pressed towards the extrusion die, and a pulp layer on the top of the pulp suction die is extruded to form a primary blank;
fifthly, absorbing pulp for three times; the pulp suction mould drives the primary blank to move downwards for mould opening, and the primary blank is immersed into the pulp tank downwards again for third pulp suction;
step six, secondary extrusion; after the third pulp suction, the pulp suction die moves upwards to the extrusion die for second extrusion to form a wet blank;
step seven, hot-pressing and drying: providing a hot pressing die, wherein the hot pressing die comprises a lower hot pressing die and an upper hot pressing die, after the secondary cold extrusion molding, the slurry suction die is turned over to enable one side of the wet blank to be below, then the slurry suction die drives the wet blank to move above the lower hot pressing die to be in press fit with the lower hot pressing die, and the wet blank is transferred onto the lower hot pressing die in an adsorption manner; then the pulp suction mold leaves, the lower hot pressing mold is lifted upwards to be pressed with the upper hot pressing mold, and after the lower hot pressing mold is pressed for a certain time, the lower hot pressing mold moves downwards to open the mold to form a paper-plastic product;
step eight, transferring and receiving materials: providing a transfer mold and a material receiving tray, wherein the lower hot pressing mold is transferred to the lower part of the transfer mold and is matched with the transfer mold for pressing so as to transfer the paper-plastic product onto the transfer film; and the transfer mold is used for blanking the paper-plastic product into the material receiving disc.
Furthermore, the draft angle of the two molds which need to be pressed together on the slurry suction mold, the extrusion mold, the upper hot pressing mold, the lower hot pressing mold and the transfer mold is 0-1 degrees.
Further, the content of the bamboo pulp fiber is 70% -75%, and the content of the wood pulp fiber and the sugarcane fiber is 25% -30%.
Furthermore, the pulp suction mould is provided with an adsorption surface, and the adsorption surface is densely provided with an exhaust groove and an air suction hole; the air suction hole is arranged in the exhaust groove and penetrates through the whole pulp suction mold from top to bottom.
Further, when the slurry is sucked, the whole slurry sucking mold is downwards immersed into the slurry tank from the upper part of the slurry tank, the air sucking holes are vacuumized, the slurry is adsorbed on the adsorption surface by the air sucking holes, a slurry layer is formed on the adsorption surface, and gas is exhausted from the exhaust groove after vacuum exhaust.
Furthermore, a mold cavity and a mold core which are matched with each other are arranged on the two molds which need to be pressed together on the slurry suction mold, the extrusion mold, the upper hot pressing mold, the lower hot pressing mold and the transfer mold.
In conclusion, the invention adopts the multiple blowing and pulp sucking, thereby solving the problem that the traditional one-time pulp sucking violent forming is easy to cause the pulling crack and the pulp pushing; especially for oversize products or narrow products with complex structures, the quality and yield of the products can be greatly improved by multiple slurry suction forming. Through setting up minimum draft, can improve the product precision greatly and reduce product adaptation clearance, make the product cooperation more accurate. The demoulding is smoother by improving the sizing agent and the lubricating additive and arranging densely distributed air suction holes and air exhaust grooves; the surface of the product is uniform and smooth, and the appearance effect is better. The invention has strong practicability and stronger popularization significance.
Drawings
FIG. 1 is a schematic view of the structure of the apparatus used in the present invention;
FIG. 2 is an enlarged view of a portion of the suction surface of FIG. 1;
fig. 3 and 4 are schematic structural views of the mold cavity and the mold core in fig. 1.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments.
The invention discloses a novel full-paper-plastic zero-degree drawing production process method, which specifically comprises the following steps;
step one, pulping; providing main raw materials such as bamboo pulp fiber, sugarcane fiber and wood pulp fiber, putting the raw materials such as bamboo pulp, sugarcane and wood pulp into a pulp tank 10, soaking, smashing and fully mixing; in the embodiment, the content of the bamboo pulp fiber is 70-75%, and the total content of the sugarcane fiber and the wood pulp fiber is 25-30%.
Step two, primary pulp suction; and providing a pulp sucking mold 20, wherein the pulp sucking mold 20 attaches the pulp prepared in the step one to the pulp sucking mold 20 to form a primary pulp layer. The slurry suction mould 20 is provided with an adsorption surface, the adsorption surface is densely provided with the exhaust grooves 21 and the air suction holes 22, and the design of the plurality of densely distributed air suction holes 22 changes the pure slurry suction of a plurality of holes into surface slurry suction, so that the slurry suction mould 20 can suck slurry more uniformly and smoothly, the surface of a product is uniform and smooth, and the appearance effect is better.
In this embodiment, the air suction holes 22 are disposed in the air discharge groove 21, and the air suction holes 22 penetrate through the entire slurry suction mold 20 from top to bottom. In addition, a vacuum-pumping device (not shown) is connected to the slurry suction mold 20, and the vacuum-pumping device performs vacuum-pumping on the air suction holes 22 to suck the slurry onto the suction surface.
The slurry suction mold 20 is arranged right above the slurry tank 10, when slurry is sucked, the whole slurry suction mold 20 is downwards immersed into the slurry tank 10 from the upper part of the slurry tank 10, meanwhile, the vacuum pumping device vacuumizes the air suction holes 22, the air suction holes 20 adsorb the slurry on the adsorption surface, and a slurry layer is formed on the adsorption surface. Then, the gas is evacuated in vacuum, and the gas is discharged from the exhaust groove 21.
Step three, secondary pulp suction; after the primary slurry suction is finished, the slurry suction mold 20 is immersed into the slurry tank 10 again for secondary slurry suction, and the thickness of the slurry layer is gradually accumulated, so that the problems of pulling crack and slurry pushing can be avoided.
Step four, extruding for the first time; providing an extrusion die 30, wherein the extrusion die 30 is arranged right above the slurry suction die 20, a die cavity 31 is arranged on the bottom surface of the extrusion die 30, and a die core 23 is arranged at the top of the slurry suction die 20. After the secondary slurry suction is finished, the slurry suction mold 20 is lifted upwards and is closed towards the direction of the extrusion mold 30, and a slurry layer on the top of the slurry suction mold 10 is extruded to form a primary blank; in addition, in this embodiment, the extrusion die is cold extrusion.
Step five, absorbing pulp for three times; after the primary extrusion is completed, the slurry suction mold 20 drives the primary blank to move downwards for mold opening, and the primary blank is immersed into the slurry tank 10 downwards again for third slurry suction, so that the accumulation of a slurry layer is completed, and the problems of slurry pushing, slurry pulling and the like caused by small film pulling angle of a product can be solved.
Step six, secondary extrusion; after the third time of pulp suction, the pulp suction die 20 moves upwards to the extrusion die 30 again for second cold extrusion to form a wet blank.
Step seven, hot-pressing and drying: and providing a hot pressing die, wherein the hot pressing die comprises a lower hot pressing die 50 and an upper hot pressing die 40, after the secondary cold extrusion molding, the slurry suction die 20 is turned to enable one side of the wet blank to be below, then the slurry suction die 20 drives the wet blank to move to the position above the lower hot pressing die 50, and then the wet blank is pressed with the lower hot pressing die 50 downwards, and the lower hot pressing die 50 is provided with a suction device which can transfer the wet blank to the lower hot pressing die 50 in an adsorption manner. And then the pulp sucking mold 20 leaves, the lower hot pressing mold 50 is lifted upwards to be pressed with the upper hot pressing mold 40, and after the lower hot pressing mold 50 moves downwards to open the mold after the hot pressing for a certain time, the paper-plastic product is formed.
Step eight, transferring and receiving materials: and providing a transfer mold 70 and a material receiving tray 80, wherein the lower hot-pressing mold 50 is transferred to the lower part of the transfer mold 70 and is matched and pressed with the transfer mold so as to transfer the paper-plastic product onto the transfer mold 70. The transfer mold 70 is provided with an air suction device which is used for adsorbing the paper-plastic products, and when material collection is needed, the air suction device can blow air to the paper-plastic products to blow the paper-plastic products into the material receiving tray 80; thereby completing the whole production process.
In addition, in the slurry suction mold 20, the extrusion mold 30, the upper hot press mold 40, the lower hot press mold 50 and the transfer mold 80 in the above steps, the mold cavity and the mold core of the above mold are all set at an angle a close to 0, the angle of the mold draft angle a is 0 to 1 degree, and more specifically, the angle of the mold draft angle a is 0.5 degree. In addition, when the forming, adjust the mould clearance, increase the product shirt rim to the convenient drawing of patterns of multiplicable hardness has certain guidance quality to do benefit to the design of product when the compound die, thereby avoids causing thick liquids to push up because of the compound die. In addition, when demoulding, the demoulding aid and the improved sizing agent are used, so that the demoulding air pressure can be pushed enough, and the expected effect is achieved.
In conclusion, the invention adopts the multiple blowing and pulp sucking, thereby solving the problem that the traditional one-time pulp sucking violent forming is easy to cause pulling crack and pulp pushing; especially for oversize products or narrow products with complex structures, the quality and yield of the products can be greatly improved by multiple slurry suction forming. Through setting up minimum draft, can improve the product precision greatly and reduce product adaptation clearance, make the product cooperation more accurate (like the upper and lower box of packing carton). The demoulding is smoother by improving the sizing agent and the lubricating additive, and arranging the densely distributed air suction holes 22 and the air exhaust grooves 21; the surface of the product is uniform and smooth, and the appearance effect is better. The invention has strong practicability and stronger popularization significance.
The above-mentioned embodiments only represent one embodiment of the present invention, and the description is specific and detailed, but not understood as the limitation of the scope of the invention, it should be noted that, for those skilled in the art, many variations and modifications can be made without departing from the concept of the present invention, and these are within the scope of the invention, and therefore, the scope of the invention should be determined by the appended claims.
Claims (3)
1. A novel full-paper-plastic zero-degree drawing production process method is characterized by comprising the following steps: comprises the following steps;
step one, pulping; putting the bamboo pulp fiber, the sugarcane fiber and the wood pulp fiber into a pulp tank, crushing, stirring and fully mixing;
step two, primary pulp suction; providing a pulp suction mold, wherein the pulp suction mold is provided with an adsorption surface, and the pulp suction mold attaches the pulp prepared in the step one to the adsorption surface to form a pulp layer; the adsorption surface is densely provided with exhaust grooves and air suction holes; the air suction hole is arranged in the exhaust groove and penetrates through the whole pulp suction mould from top to bottom; when the slurry is sucked, the whole slurry sucking mold is downwards immersed into the slurry tank from the upper part of the slurry tank, the air suction holes are vacuumized at the same time, the slurry is adsorbed on the adsorption surface by the air suction holes, a slurry layer is formed on the adsorption surface, then the vacuum exhaust is carried out, and the gas is exhausted from the exhaust groove;
step three, secondary pulp suction; after primary pulp suction is finished, the pulp suction mold performs secondary pulp suction in the pulp pool;
step four, extruding for the first time; providing an extrusion die, wherein the extrusion die is arranged above a pulp suction die, after secondary pulp suction is finished, the pulp suction die is lifted upwards and pressed towards the extrusion die, and a pulp layer on the top of the pulp suction die is extruded to form a primary blank;
step five, absorbing pulp for three times; the pulp suction mould drives the primary blank to move downwards for mould opening, and the primary blank is immersed into the pulp tank downwards again for third pulp suction;
step six, secondary extrusion; after the third pulp suction, the pulp suction die moves upwards to the extrusion die for second extrusion to form a wet blank;
step seven, hot-pressing and drying: providing a hot pressing die, wherein the hot pressing die comprises a lower hot pressing die and an upper hot pressing die, after the secondary cold extrusion molding, the slurry suction die is turned over to enable one side of the wet blank to be below, then the slurry suction die drives the wet blank to move above the lower hot pressing die to be in press fit with the lower hot pressing die, and the wet blank is transferred onto the lower hot pressing die in an adsorption manner; then the pulp suction mold leaves, the lower hot pressing mold is lifted upwards to be pressed with the upper hot pressing mold, and after the lower hot pressing mold is pressed for a certain time, the lower hot pressing mold moves downwards to open the mold to form a paper-plastic product; the draft angle of the two moulds which need to be pressed together on the pulp suction mould, the extrusion mould, the upper hot pressing mould, the lower hot pressing mould and the transfer mould is 0-1 degree;
step eight, transferring and receiving materials: providing a transfer mold and a material receiving tray, wherein the lower hot pressing mold is transferred to the lower part of the transfer mold and is matched with the transfer mold for pressing so as to transfer the paper-plastic product onto the transfer film; and the transfer mold is used for blanking the paper-plastic product into the material receiving disc.
2. The process for producing the zero-degree drawing of the all-paper-plastic composite material as claimed in claim 1, wherein the process comprises the following steps: the content of the bamboo pulp fiber is 70-75%, and the content of the wood pulp fiber and the sugarcane fiber is 25-30%.
3. The full paper-plastic zero-degree drawing production process as claimed in claim 1, characterized in that: and a mould cavity and a mould core which are matched with each other are arranged on the two moulds which need to be pressed together on the slurry suction mould, the extrusion mould, the upper hot pressing mould, the lower hot pressing mould and the transfer mould.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110425784.2A CN113235323B (en) | 2021-04-20 | 2021-04-20 | Full paper-plastic zero-degree drawing production process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110425784.2A CN113235323B (en) | 2021-04-20 | 2021-04-20 | Full paper-plastic zero-degree drawing production process |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113235323A CN113235323A (en) | 2021-08-10 |
| CN113235323B true CN113235323B (en) | 2022-12-09 |
Family
ID=77128613
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110425784.2A Active CN113235323B (en) | 2021-04-20 | 2021-04-20 | Full paper-plastic zero-degree drawing production process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113235323B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109736139A (en) * | 2018-12-29 | 2019-05-10 | 永发（江苏）模塑包装科技有限公司 | A kind of molding equipment and method of paper mould |
| CN111549580A (en) * | 2020-05-14 | 2020-08-18 | 重庆凯成科技有限公司 | Manufacturing process of paper-plastic packaging product sprayed with environment-friendly resin |
| CA3139108A1 (en) * | 2019-05-06 | 2020-11-12 | Zume, Inc. | Systems and methods for producing molded fiber products |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9604393B2 (en) * | 2011-02-02 | 2017-03-28 | Nanjing University Of Technology Dafeng Institute Of Marine Industry | Wet process of fabricating fiber wall panels |
| JP2013129921A (en) * | 2011-12-20 | 2013-07-04 | Toppan Printing Co Ltd | Method for producing molded pulp container and the molded pulp container produced |
| TWI537451B (en) * | 2014-03-19 | 2016-06-11 | Wu Ming Hua | Ultra - small draft angle angle pulp molding products automatic molding machine |
| CN205557199U (en) * | 2016-04-20 | 2016-09-07 | 金华市众生纤维制品有限公司 | Inhale thick liquid mould |
| CN108252164B (en) * | 2018-03-16 | 2023-08-15 | 常州市诚鑫环保科技有限公司 | Automatic forming machine for double-time down-suction slurry of molded product and manufacturing method |
| TWM565218U (en) * | 2018-03-30 | 2018-08-11 | 金箭印刷事業有限公司 | Three-dimensional paper-plastic product manufacturing equipment with zero draft angle |
| CN109457546B (en) * | 2018-11-09 | 2020-12-22 | 重庆凯成科技有限公司 | Laminated paper-plastic production method |
| CN111424467A (en) * | 2019-01-09 | 2020-07-17 | 常州市诚鑫环保科技有限公司 | Reciprocating type pulp-sucking automatic forming machine for paper-plastic products and manufacturing method |
| CN110219210B (en) * | 2019-01-31 | 2024-02-27 | 浙江舒康科技有限公司 | Pulp molding production line and processing method |
-
2021
- 2021-04-20 CN CN202110425784.2A patent/CN113235323B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109736139A (en) * | 2018-12-29 | 2019-05-10 | 永发（江苏）模塑包装科技有限公司 | A kind of molding equipment and method of paper mould |
| CA3139108A1 (en) * | 2019-05-06 | 2020-11-12 | Zume, Inc. | Systems and methods for producing molded fiber products |
| CN111549580A (en) * | 2020-05-14 | 2020-08-18 | 重庆凯成科技有限公司 | Manufacturing process of paper-plastic packaging product sprayed with environment-friendly resin |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113235323A (en) | 2021-08-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112726292B (en) | Transfer-free manufacturing process and manufacturing equipment of paper pulp molded product | |
| CN101434119A (en) | Compression moulding forming method, reinforced plastic and special facing material for the method | |
| CN113235323B (en) | Full paper-plastic zero-degree drawing production process | |
| CN109137632B (en) | Mould for realizing back-off shape of pulp molding product and production method | |
| CN101918190B (en) | Mould system for making partition in cardboard-based container | |
| CN116766628A (en) | Forming method of composite material antenna window with high surface smoothness and small chromatic aberration | |
| CN108060617B (en) | Multi-section downdraft automatic molding machine for molded products and manufacturing method | |
| RU2008140512A (en) | COMPRESSION FORMATION OF THE SPLITTED CELLULOSE MATERIAL | |
| CN101451332A (en) | Method for producing paper pulp molding package barrel | |
| CN205969636U (en) | Novel retrench bilayer and push up structure mold to one side | |
| CN204997932U (en) | Correct a long and thin injection mold structure of warping of moulding | |
| CN201285257Y (en) | Special mold for firework outer cylinder, special-shaped product outer casing and firework spherical casing | |
| CN209289876U (en) | Novel corrugation paper producing apparatus | |
| CN114277615B (en) | Forming process | |
| CN207465924U (en) | A kind of mold for vacuum infusion molding | |
| CN207240916U (en) | High-pressure resin Transfer molding mould | |
| CN108115886A (en) | A kind of science and technology service injection mold structure | |
| CN112677456B (en) | Plastic suction forming method and plastic suction mold for plastic packaging box | |
| CN205439116U (en) | No die parting line vestige mould and product | |
| CN205364392U (en) | Injection mold | |
| CN109797606B (en) | Method for compensating shrinkage coefficients of different parts of same product in pulp molding | |
| CN201296016Y (en) | A forming device of in-mold decorations | |
| CN209141262U (en) | Insulation board material feeding mold | |
| US20240035236A1 (en) | Energy-saving production process method for rapid drying and dewatering of paper-plastic products | |
| CN213227336U (en) | Art screw hole demoulding mechanism |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |