CN110983866A - Negative drawing forming equipment, system and process for pulp molded product - Google Patents
Negative drawing forming equipment, system and process for pulp molded product Download PDFInfo
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- CN110983866A CN110983866A CN201911261299.5A CN201911261299A CN110983866A CN 110983866 A CN110983866 A CN 110983866A CN 201911261299 A CN201911261299 A CN 201911261299A CN 110983866 A CN110983866 A CN 110983866A
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- 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
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Abstract
The invention discloses negative drawing forming equipment for a pulp molded product, which comprises an upper die part and a corresponding lower die part, wherein the opposite surfaces of the upper die part and the lower die part are correspondingly provided with a groove structure and a protruding structure, so that the upper die part and the lower die part are matched to extrude the pulp molded product to form a back-off structure; the upper die part comprises an upper die plate and a female die insert arranged on the upper die plate; the lower die part comprises a lower die plate and a suspension structure which is fixedly arranged on the lower die plate and used for placing molded pulp molded products, and the upper surface of the suspension structure is provided with a top block corresponding to the concave die insert. The forming equipment effectively solves the problem of the inverted structure, namely negative drawing, in the molded product. Meanwhile, the invention also discloses a negative draft forming system and a negative draft forming process for the pulp molded product, the whole system improves the efficiency of forming the product, the process operability is strong, and the product structure is stable.
Description
Technical Field
The invention relates to the technical field of molding, in particular to negative draft forming equipment, a negative draft forming system and a negative draft forming process for a pulp molded product.
Background
The pulp molding is wet-pressed in one-step molding, and the drawing angle of the wet-pressed molding is positive, so that the pulp molding can be made into a product without reverse buckling.
In order to meet the market and customer requirements, a large number of molded products involve a reverse-buckling structure, namely, a condition that a mold drawing angle is negative, and at the moment, the molded products can be formed only through special processing.
The difficulty of the secondary forming technology for the inverted buckle structure is that secondary dry pressing forming needs to be carried out on a primary formed product, and the dry pressing secondary forming has more problems, such as crease, cracking, wrinkling, galling, elastic deformation of the product and size control of other parts and the like, of the product, and the manufactured product is far from meeting the requirements of customers.
In order to solve the problems encountered in the prior art, the improvement is attempted from the perspective of mold design, the mold design gap is modified, such as changing to a material thickness, the local R angle of the product is increased or decreased, but the problem of crease can not be solved through a series of mold trial and modification, and particularly, the deformation and crease are more serious as the depth of a convex hull on the side surface of the product is increased; the depth of the side convex hull is confirmed through a test die, the deeper the side convex hull is, the more serious the crease is, if the side convex hull is too shallow, the first depth can not meet the requirement, and after the product is placed for a week, the convex hull on the side can also be restored to a certain extent, and the size is slowly reduced. In order to solve the problems, an atomization mode is adopted for dry pressing products, namely water is sprayed on the formed dry products, paper fibers of the products are loosened and softened, creases of the products are improved in the atomization mode, but new problems are generated, the A surface of the products is fluffed in the secondary forming process after the products are atomized, the appearance quality of the products is seriously affected, and the problems are not solved. After that, the sponge cushion is added on the lower die of the secondary forming die, the sponge with different hardness is used for testing, for example, the sponge with the thickness of 2.0MM, the hardness of 26 degrees, the thickness of 1.0MM and the hardness of 42 degrees is used for testing, the crease is improved to some extent, but the problem of cracking is not completely solved by testing different sponge cushions, and the problem of cracking is also generated because the product is formed by dry pressing for two times, such as twice dry pressing, the size rebound is large, the cracking is serious, and the scheme still needs to be improved after the discussion of the group members. The back is through technical division and team member common discussion decision to increase the spring to the post forming die lower mould and solve crease and fracture, let the spring bounce the lower bolster of post forming die earlier, the post forming die pushes down the product with the spring earlier before pushing down, then at post forming, test through the scheme that increases the spring to the mould, the problem of result fracture can be solved, but the product side convex closure size of beating out is very unstable, the reason lies in that the spring moves about from top to bottom when the mould pushes down and is steady inadequately. After the analysis and discussion of the product, the secondary forming on the product which is dry pressed out once is impossible to realize, and the bottleneck state appears technically.
The solution provided by the above brings other problems while solving the problems, and whether a technician tries to solve the problems in a complementary mode or not is firstly pressed by a spring on a secondary die, the spongy cushion is additionally arranged on the lower die, the thickness and the hardness of the spongy cushion are changed at the same time, the atomization treatment of the once-formed dried product is softened, meanwhile, the size of the R angle of the die is modified, and tests show that the problems of crease, fuzzing, cracking, wrinkling and deformation of the product are really and obviously improved, the punched product can be temporarily handed over to a sample, but the yield is very low and unstable, and the effect is shown in FIG. 7.
Disclosure of Invention
The invention aims to provide equipment for effectively solving the problem of the inverted buckle structure in a molded product, the obtained product is not retracted, does not have crease and fuzz, and meanwhile, the invention also provides a system and a process for preparing the molded product with the inverted buckle structure.
The invention provides negative drawing forming equipment for a pulp molded product, which comprises an upper die part and a corresponding lower die part, wherein the opposite surfaces of the upper die part and the lower die part are correspondingly provided with a groove structure and a protruding structure, so that the upper die part and the lower die part are matched to extrude the pulp molded product to form a reversed buckle structure.
Optionally, the upper mold portion comprises an upper mold plate and a cavity insert disposed on the upper mold plate. Optionally, the lower die part comprises a lower template and a suspension structure fixedly arranged on the lower template and used for placing molded pulp molded products, and an ejector block corresponding to the female die insert is arranged on the upper surface of the suspension structure.
Optionally, the suspension structure includes a fixing unit block and a protruding unit block integrated with the fixing unit block, and the top block is disposed on an upper surface of the protruding unit block.
Optionally, a silica gel layer covers the outer surface of the top block.
Optionally, the silica gel layer is 1.0 mm-2.0mm, and the hardness of the silica gel layer is 48-52 degrees.
Optionally, the diameter of the arc formed at the outer edge of the concave die insert is 2 times of the diameter of the arc formed at the inner edge.
Optionally, the design gap between the upper die part and the lower die part forming the undercut structure is 20% of the material thickness, and 20% means that the design gap is 0.8mm if the product thickness is 1.0 mm.
The invention also provides a negative drawing forming system of the pulp molding product,
the pulp suction mould sucks pulp from the pulp tank to form a wet blank;
the extrusion die is arranged above the pulp suction die correspondingly, and the pulp suction die and the extrusion die perform primary extrusion on the wet blank after the wet blank is driven to rotate upwards by the pulp suction die;
the hot-pressing upper die can move up and down along the vertical direction;
the hot pressing lower die can move left and right along the horizontal direction, and when the hot pressing lower die moves to vertically correspond to the hot pressing lower die, hot pressing treatment is carried out on the wet blank; a gas suction device is arranged in the hot-pressing upper die, and a gas blowing device is arranged in the hot-pressing lower die;
negative-draft forming die comprising the pulp molded product negative-draft forming apparatus according to any one of claims 1 to 8.
The invention also comprises a negative drawing forming process of the pulp molded product, which comprises the following steps:
the pulp suction mould sucks pulp from the pulp tank, turns over, extrudes with an extrusion mould arranged on the pulp suction mould, turns over again after extruding, at the moment, the hot pressing lower mould moves to the left below the pulp suction mould, and the pulp suction mould places the wet blank in the hot pressing lower mould;
the hot-pressing lower die moves rightwards to a position corresponding to the hot-pressing upper die, at the moment, the hot-pressing upper die moves vertically downwards to extrude the wet blank with the hot-pressing lower die and heat and shape the wet blank, a sample is punched out, and then the hot-pressing lower die is opened to finish the hot-pressing action;
the hot pressing lower die is transferred into the transfer die, the transfer die slides downwards and is matched with the hot pressing lower die at the moment, and the transfer die is vacuumized and adsorbed to adsorb a product on the transfer die to finish the transfer action;
and blowing the product onto the working table of the machine by using the air blowing of the transfer mold, taking out the dried product by an operator, and then putting the dried product onto negative-drawing molding equipment for secondary molding.
The technical scheme of the invention has the following advantages:
the negative drawing forming equipment for the pulp molded product, provided by the embodiment of the invention, can realize mass production of the paper molded product with similar back-off and negative drawing, and is difficult to prepare by one-step forming; in order to obtain a product which is more stable and avoids retraction or has creases, a silica gel layer is coated on a convex block of a concave mold insert of the lower mold part, the silica gel layer is 1.0 mm-2.0mm, the hardness of the silica gel layer is 48-52 degrees, the convex part of the inverted product obtained by the silica gel layer with the thickness and the hardness is not retracted, no crease exists on the periphery of the convex part, and the phenomena of fluffing or cracking deformation are generated, so that a perfect negative-drawing mold paper-plastic product is obtained.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic view of a reverse buckle structure;
FIG. 2 is a schematic structural view of a molded product after primary molding and secondary molding;
FIG. 3 is a schematic view of a one-shot forming and two-shot forming apparatus;
FIG. 4 is a schematic structural view of an upper mold part of the negative draft molding apparatus;
FIG. 5 is a schematic structural view of a lower mold part of the negative draft molding apparatus;
FIG. 6 is a schematic view of a die structure of a negative draft apparatus;
FIG. 7 is a schematic view of the angle of the corresponding position of the molded product;
FIG. 8 is a diagram of the effect of an unqualified inverted product;
FIG. 9 is a diagram of the results of a product using the molding system of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example 1
The negative drawing product or the inverted product of the invention is shown in figure 1, and the 'inverted buckle' and 'negative drawing' related in the paper-plastic product refers to that the paper-plastic product can not be directly formed by normal demoulding, drawing and the like, the side wall of the product has a convex hull or the side surface of the product has a surface with a special-shaped inclined plane larger than 90 degrees, which is called as the negative drawing or the inverted buckle for short.
The pulp molded product negative drawing forming equipment provided by the embodiment comprises an upper die part 70 and a corresponding lower die part 80, wherein a groove structure and a protruding structure are correspondingly arranged on the opposite surfaces of the upper die part 70 and the lower die part 80, so that the upper die part 70 and the lower die part 80 are matched to extrude a pulp molded product to form an inverted buckle structure.
Specifically, referring to fig. 4 and 5, the upper mold part 70 includes an upper mold plate 702 and a female mold insert 701 disposed on the upper mold plate 702, wherein the upper mold plate is provided with a plurality of limiting columns 703 at 4 outer corners, and a spring is sleeved on the limiting columns near the upper mold plate; the lower die part 80 comprises a lower die plate 804 and a suspension structure fixedly arranged on the lower die plate 804 and used for placing molded pulp molded products, wherein the upper surface of the suspension structure is provided with a top block 801 corresponding to the concave die insert, the suspension structure in the embodiment comprises a fixed unit block 802 and a protruding unit block 805 integrated with the fixed unit block, the top block 801 is arranged on the upper surface of the protruding unit block 805, a limiting groove is arranged at the position of the lower die plate corresponding to the limiting column of the upper die plate, and when the upper die part is driven by an oil pressure mechanism to move downwards and is combined and fastened with the lower die part, the limiting column 703 extends into the limiting groove 803 and provides certain buffering through a spring. A pressing structure 806 is further provided on the side of the lower mold portion, and as shown in fig. 6, when the one-time molded product is placed on the protruding unit block 805, the pressing structure 806 rotates to approach and press a side surface of the molded product, so that the product is stable when the upper mold and the lower mold are assembled, and the position of the formed inverted structure is more accurate.
The main purpose of the suspension structure is that a product formed in one step can be stably lapped on the structure, so that a position to be subjected to negative drawing can be clamped between the die insert 701 and the top block 801, and therefore, the suspension structure can be modified in various ways, and is not limited to the manner of the embodiment.
Preferably, the outer surface of the top block 801 is coated with a silicone layer, the silicone layer is 1.0 mm-2.0mm, the hardness of the silicone layer is 48-52 degrees, it should be noted that the thickness of the product of the present invention, or the thickness of the molded product in the art, is generally 0.6mm-2.0mm, and therefore the thickness of the silicone layer can be applied within the thickness range of the product.
Also, the outer and inner rim angles of the cavity insert 701 are required, as shown in fig. 7, with Ra of 0.5mm and Rb of 1.0 mm.
The design clearance of the upper die part and the lower die part for forming the back-off structure is 20% of the material thickness, namely when the thickness of a product is 1.0mm, the design clearance of the die is 0.8 mm.
Example 2
Referring to fig. 3, the negative draft forming system for pulp molded products of this embodiment sequentially includes, in order of preparation of the pulp molded products: the slurry suction mould 1 sucks slurry from the slurry pool to form a wet blank; the extrusion die 2 is arranged above the pulp suction die 1 correspondingly, and after the pulp suction die 1 rotates upwards with the wet blank, the wet blank is subjected to primary extrusion with the extrusion die 2; the hot-pressing upper die 3 can move up and down along the vertical direction; the hot-pressing lower die 4 can move left and right along the horizontal direction, and when the hot-pressing lower die 4 moves to vertically correspond to the hot-pressing lower die, hot-pressing treatment is carried out on the wet blank; a suction device is arranged in the hot-pressing upper die 3, and a blowing device is arranged in the hot-pressing lower die 4; a hot-pressing lower die 4 and a transfer die 5 arranged on the downstream side of the hot-pressing lower die 4 are fixed on the horizontal sliding plate, and the lower part of the transfer die is provided with an air blowing structure for blowing a product on a workbench 6; manually transferring the one-step formed product to a suspension structure of the negative drawing structure 7, pressing the product by the pressing structure, and moving the upper die part downwards to form the two-step formed product with the inverted buckle structure. Referring to fig. 9, specifically, after the slurry suction mold 1 sucks slurry from the slurry tank, it turns over, and extrudes with the extrusion mold 2 arranged thereon, and turns over again after extrusion, at this time, the hot pressing lower mold 3 moves to the left below the slurry suction mold 1, the slurry suction mold 1 places a wet blank in the hot pressing lower mold 4, at this time, a station 1 is formed, the hot pressing lower mold 4 moves to the right to a position corresponding to the hot pressing upper mold 3, a station 2 is formed, at this time, the hot pressing upper mold 3 moves vertically downward, and extrudes the wet blank with the hot pressing lower mold 4 and heats and shapes, because the air suction device is arranged in the hot pressing upper mold 3, and the air blowing device is arranged in the hot pressing lower mold 4, therefore, the molded product formed here is on the hot pressing upper mold 3, then the hot pressing lower mold 4 and the unloading fixture move to the left together, and returns to the station 1, at this time, the hot pressing upper mold, and the right side moves back to the station 2, the system reduces the forming movement time of the equipment and improves the cycle period of the equipment by more than 20 s. And then transferring the primary molded product to negative die drawing equipment for secondary molding for 3 s.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (10)
1. The negative drawing forming equipment for the pulp molded product is characterized by comprising an upper die part and a corresponding lower die part, wherein a groove structure and a protruding structure are correspondingly arranged on opposite surfaces of the upper die part and the lower die part, so that the upper die part and the lower die part are matched to extrude the pulp molded product to form a reversed buckle structure.
2. The pulp molded product negative draft molding apparatus according to claim 1, wherein said upper mold portion includes an upper mold plate, and a female mold insert provided on said upper mold plate.
3. The pulp molded product negative draft forming device according to claim 1, wherein the lower mold part comprises a lower mold plate and a suspension structure fixed on the lower mold plate for placing the molded pulp molded product, and a top block corresponding to the cavity insert is arranged on the upper surface of the suspension structure.
4. The pulp molding negative draft forming device according to claim 3, wherein the suspension structure includes a fixing unit block and a protruding unit block integrated with the fixing unit block, and the top block is provided on an upper surface of the protruding unit block.
5. The pulp molded product negative draft forming device according to claim 3 or 4, wherein a silicone layer is coated on the outer surface of the top block.
6. The pulp molded product negative draft forming device according to claim 5, wherein the silicone rubber layer is 1.0mm to 2.0mm, and the hardness thereof is 48 degrees to 52 degrees.
7. The pulp molding negative draft forming device according to claim 6, wherein the diameter of the arc formed at the outer edge of the concave mold insert is 2 times the diameter of the arc formed at the inner edge.
8. The pulp molded product negative draft forming apparatus according to any one of claims 1 to 7, wherein a design clearance of the upper die portion and the lower die portion forming the undercut structure is 20% of the stock thickness.
9. A negative drawing forming system for a pulp molding product is characterized in that,
the pulp suction mould sucks pulp from the pulp tank to form a wet blank;
the extrusion die is arranged above the pulp suction die correspondingly, and the pulp suction die and the extrusion die perform primary extrusion on the wet blank after the wet blank is driven to rotate upwards by the pulp suction die;
the hot-pressing upper die can move up and down along the vertical direction;
the hot pressing lower die can move left and right along the horizontal direction, and when the hot pressing lower die moves to vertically correspond to the hot pressing lower die, hot pressing treatment is carried out on the wet blank; a gas suction device is arranged in the hot-pressing upper die, and a gas blowing device is arranged in the hot-pressing lower die;
negative-draft forming die comprising the pulp molded product negative-draft forming apparatus according to any one of claims 1 to 8.
10. A negative drawing forming process for a pulp molding product is characterized in that,
the pulp suction mould sucks pulp from the pulp tank, turns over, extrudes with an extrusion mould arranged on the pulp suction mould, turns over again after extruding, at the moment, the hot pressing lower mould moves to the left below the pulp suction mould, and the pulp suction mould places the wet blank in the hot pressing lower mould;
the hot-pressing lower die moves rightwards to a position corresponding to the hot-pressing upper die, at the moment, the hot-pressing upper die moves vertically downwards to extrude the wet blank with the hot-pressing lower die and heat and shape the wet blank, a sample is punched out, and then the hot-pressing lower die is opened to finish the hot-pressing action;
the hot pressing lower die is transferred into the transfer die, the transfer die slides downwards and is matched with the hot pressing lower die at the moment, and the transfer die is vacuumized and adsorbed to adsorb a product on the transfer die to finish the transfer action;
and blowing the product onto the working table of the machine by using the air blowing of the transfer mold, taking out the dried product by an operator, and then putting the dried product onto negative-drawing molding equipment for secondary molding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911261299.5A CN110983866A (en) | 2019-12-10 | 2019-12-10 | Negative drawing forming equipment, system and process for pulp molded product |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911261299.5A CN110983866A (en) | 2019-12-10 | 2019-12-10 | Negative drawing forming equipment, system and process for pulp molded product |
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| CN110983866A true CN110983866A (en) | 2020-04-10 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112127215A (en) * | 2020-09-17 | 2020-12-25 | 浙江舒康科技有限公司 | Pulp molding product production line with roll forming function |
| CN112144320A (en) * | 2020-09-17 | 2020-12-29 | 浙江舒康科技有限公司 | Machining equipment and method for paper pulp molded product |
| CN112176780A (en) * | 2020-09-18 | 2021-01-05 | 外贸无锡印刷股份有限公司 | Device and method for twice in-mold heating forming of high-end pulp molded product |
| TWI795213B (en) * | 2022-02-17 | 2023-03-01 | 邱聖峯 | Automatic pulp-molding method |
-
2019
- 2019-12-10 CN CN201911261299.5A patent/CN110983866A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112127215A (en) * | 2020-09-17 | 2020-12-25 | 浙江舒康科技有限公司 | Pulp molding product production line with roll forming function |
| CN112144320A (en) * | 2020-09-17 | 2020-12-29 | 浙江舒康科技有限公司 | Machining equipment and method for paper pulp molded product |
| CN112176780A (en) * | 2020-09-18 | 2021-01-05 | 外贸无锡印刷股份有限公司 | Device and method for twice in-mold heating forming of high-end pulp molded product |
| TWI795213B (en) * | 2022-02-17 | 2023-03-01 | 邱聖峯 | Automatic pulp-molding method |
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