CN112829386B - Forming process of buffer material - Google Patents
Forming process of buffer material Download PDFInfo
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- CN112829386B CN112829386B CN202110168337.3A CN202110168337A CN112829386B CN 112829386 B CN112829386 B CN 112829386B CN 202110168337 A CN202110168337 A CN 202110168337A CN 112829386 B CN112829386 B CN 112829386B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31F1/00—Mechanical deformation without removing material, e.g. in combination with laminating
- B31F1/0077—Shaping by methods analogous to moulding, e.g. deep drawing techniques
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Abstract
The application relates to the field of paper product forming processes, in particular to a forming process of a buffer material. The key points of the technical scheme are as follows: the method comprises the following steps: s1, preparing a base material, wherein the base material uses a paper cylinder, and the paper cylinder is a kraft paper cylinder; s2, debugging equipment, wherein the equipment is provided with a core mould and four side pressing moulds positioned on one side of the core mould, the four side pressing moulds are respectively positioned on the upper side, the lower side, the left side and the right side of the core mould, and the temperature of the side pressing moulds and the core mould is raised; s3, placing the base material, and sleeving the paper tube to the core mold to realize placement; s4, starting equipment to enable the side pressing mold to move towards the core mold and be matched with the core mold, and extruding and deforming the paper tube; s5, keeping the extrusion action, and baking and hardening the paper tube by the side pressing die and the core die; s6, starting equipment to enable the side compression mold to return; s7, taking the workpiece out of the core mold. The production process has the advantages that the production process of the buffer material is improved, and the production quality of the buffer material is improved.
Description
Technical Field
The application relates to the field of paper product forming processes, in particular to a forming process of a buffer material.
Background
The cushioning packaging is also called shockproof packaging, and generally relates to logistics links such as transportation, storage, stacking, loading and unloading from the production completion to delivery use of industrial products, and external force acts on the products in any link.
At present, the widely used buffer materials are mainly foam buffer materials and paper buffer materials, on one hand, the foam buffer materials are mainly prepared by using materials such as plastics and rubber as raw materials through foaming and expansion by a foaming technology, and have the advantages of corrosion resistance, easy processing performance, good water resistance and good buffer performance. On the other hand, compared with the foaming buffer material, the paper buffer material has the characteristics of recoverability and degradability, wide applicable temperature range, convenient material acquisition, low price and the like, and has more development potential as environmental protection consciousness goes deep into the mind; for example, in the related art, for example, chinese patent publication No. CN111056145a discloses a packaging cushioning material, which is mainly technically characterized in that the packaging cushioning material includes a main body protection portion in a long tube shape and a side protection portion, the outer edge contour of the main body protection portion is arranged in a quasi-square tube shape, the middle portions of the main body protection portion and the side protection portion are respectively recessed to form a clamping groove, and the cross sections of the main body protection portion and the side protection portion are respectively U-shaped; the clamping groove can be used for embedding the side edge of an electronic product such as a display screen to protect the electronic product.
In the above-mentioned related art, in the production of such a paper cushioning material,
the inventor tries to use a plurality of forming methods to form the material, however, the workpiece still has the quality defects of easy rebound, structural strength deficiency and the like, the forming effect and the protection effect can not reach the ideal requirements, and the forming process of the buffer material has a larger improvement space.
Disclosure of Invention
In order to improve the production process of the buffer material and further improve the production quality of the buffer material, the application provides a buffer material forming process.
The forming process of the buffer material adopts the following technical scheme:
a buffer material forming process comprises the following steps:
s1, preparing a base material, wherein the base material uses a paper cylinder, and the paper cylinder is a kraft paper cylinder;
s2, debugging equipment, wherein the equipment is provided with a core mould and four side pressing moulds positioned on one side of the core mould, the four side pressing moulds are respectively positioned on the upper side, the lower side, the left side and the right side of the core mould, and the temperature of the side pressing moulds and the core mould is raised;
s3, placing a base material, and sleeving the paper tube to the core mold to realize placement;
s4, starting equipment to enable the side pressing mold to move towards the core mold and be matched with the core mold, and extruding and deforming the paper tube;
s5, keeping the extrusion action, and baking and hardening the paper tube by the side pressing die and the core die;
s6, starting equipment to enable the side compression mold to return;
and S7, taking the workpiece out of the core mold.
By adopting the technical scheme, on one hand, the four side pressing dies distributed on the periphery of the core die can respectively perform extrusion forming on the periphery of the base material, the paper tube can be formed into a square-tube-like integrated buffer material in an extrusion forming mode, the structure is compact, the overall stability is greatly improved in an integrated mode, and the paper tube is not easy to break and fall off; on the other hand, mode through toasting the heating, can make fiber container work piece sclerosis design, when receiving the extrusion, the material is because of its deformable energy-absorbing of paper characteristic, realize the buffering effect, and simultaneously, the material is through the sclerosis processing, make the difficult plastic deformation that produces of material, it is effectual to make the resilience when the material energy-absorbing deforms simultaneously, still can keep initial condition after repetitious usage, the buffer material who makes in this application has better shock-absorbing capacity, buffer material's production quality obtains great promotion.
Preferably, the heating temperature in step S2 is 110 to 130 degrees celsius, and the holding time of the pressing action in step S5 is 50 to 70 seconds.
By adopting the technical scheme, experiments show that when the temperature is less than 110 ℃ and the heating time is less than 50s, the hardening effect of the workpiece is too soft and causes unsatisfactory use requirements, the use requirements cannot be met, when the temperature is greater than 130 ℃ and the heating time is greater than 70s, the workpiece is easy to generate a scorching condition and cannot meet the use requirements, when the heating temperature is 11 ℃ to 0 ℃ to 130 ℃, and the extrusion holding time is between 50s and 70s, the workpiece has better rebound resilience and better structural strength, and the actual use requirements are met.
Preferably, the equipment comprises a hydraulic cylinder, the side pressing die is fixedly arranged on the hydraulic cylinder, and the working pressure of the hydraulic cylinder is 2 tons to 3 tons.
By adopting the technical scheme, when the working pressure of the hydraulic cylinder is less than 2 tons, the extrusion force of the side pressing die is insufficient, so that the forming effect of the workpiece is deficient, when the working pressure of the hydraulic cylinder is more than 3 tons, the edge of the workpiece is easy to crack and damage when the side pressing die extrudes the paper tube, the quality of the workpiece is affected, and when the working pressure of the hydraulic cylinder is between 2 tons and 3 tons, the forming quality of the workpiece is better.
Preferably, heating rods are respectively installed in the side pressing die and the core die, the side pressing die and the core die are both made of heat-conducting metal, the number of the heating rods is two, and the heating power of the heating rods is between 800w and 1200 w.
By adopting the technical scheme, experiments show that when the number of the heating rods is less than two, the temperature rise rates of the side pressing die and the core die are slow, so that the adjusting time is too slow, and meanwhile, if the number of the heating rods is more than two, the equipment cost investment is high; the heating rods are selected from 800w to 1200w, and the selected power is two, so that the side pressing die and the core die have higher heating rates, the manufacturing cost of the device can be reduced, and the device is economical and applicable.
Preferably, in step S4, one of the four side dies is first actuated and kept in a pressed state, and then the remaining side dies are actuated.
By adopting the technical scheme, the side pressing die is started at first, one side of the paper tube can be clamped and positioned while being extruded and molded, the paper tube is not easy to deviate, then the other side pressing dies are started, the paper tube can be subjected to side pressing molding accurately, and the molding precision of a workpiece is improved.
Preferably, the paper cylinder is firstly wound by kraft paper and bonded by environment-friendly glue to form a raw rod, and then the raw rod is cut to form the paper cylinder.
Through adopting above-mentioned technical scheme, the cow hide paper has better toughness, and is difficult damaged, durable for a long time, uses environmental protection white latex to bond reducible industrial pollution to the paper simultaneously, and the product is more environmental protection, cuts the stalk and can make buffer material possess specific use length, satisfies the practical demand of different products, and it is nimble convenient to use.
Preferably, the length of the mandrel is 5cm to 200cm.
By adopting the technical scheme, when the length of the core mold is between 5cm and 200cm, a workpiece of 5cm to 200cm can be molded, the length can be adjusted according to the actual length of the workpiece, and the molded length of the workpiece is controllable and flexible to use.
Preferably, the middle part of the side pressing die is provided with a boss, the middle part of the core die is provided with a groove, and the boss and the groove are mutually inserted and matched.
Through adopting above-mentioned technical scheme, at the in-process of the mutual compound die of side pressure mould and mandrel, the grafting each other between boss and the recess can make the work piece form the draw-in groove, and the draw-in groove can be used for the side part of electronic display screen class one to carry out the gomphosis installation, and the structure is practical, and buffer material's suitability is promoted.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the paper tube can be formed into an integrated strip-shaped buffer material with a shape matched with the paper tube in an extrusion forming mode, the structure is compact, meanwhile, a paper tube workpiece can be hardened and shaped in a baking mode, when the paper tube workpiece is extruded, the material can be deformed and absorb energy due to the paper characteristic, meanwhile, the material is not easy to generate plastic deformation due to hardening treatment, the rebound effect during energy absorption and deformation of the material is good, the initial state can be still kept after the paper tube workpiece is used for many times, the prepared buffer material has good buffer performance, and the production quality of the buffer material is greatly improved;
2. the material has reasonable baking time and temperature, better rebound resilience and better structural strength;
3. the extrusion force of the material is proper, the workpiece is formed smoothly and is not easy to crack, and the forming quality of the workpiece is better.
Drawings
Fig. 1 is a schematic structural diagram of a substrate and a packaging cushioning material in example 1 of the present application.
FIG. 2 is a schematic view showing the structure of a molding apparatus in example 1 of this application.
FIG. 3 is a schematic view showing the structure of a side molding die, a hydraulic cylinder and a heating rod in example 1 of this application.
Fig. 4 is a schematic view showing the structures of the core mold, the side press mold, and the heating rod in example 1 of the present application.
Fig. 5 is a flowchart in embodiment 1 of the present application.
Description of reference numerals: 1. a substrate; 2. packaging the buffer material; 21. a card slot; 3. a core mold; 31. a groove; 32. forming a groove; 4. side pressing die; 41. a boss; 42. molding convex strips; 5. a hydraulic cylinder; 6. a heating rod; 7. and a frame.
Detailed Description
The present application is described in further detail below with reference to figures 1-5.
Referring to fig. 1, for packing buffer material 2 and substrate 1 before the shaping among the correlation technique, substrate 1 chooses for use to be circular fiber container, circular fiber container can form after processing to have class square tube shape packing buffer material 2, and the sunken draw-in groove 21 that is provided with in one side of packing buffer material 2, the cross-section of packing buffer material 2 is the setting of U font this moment, draw-in groove 21 can be supplied the edge of electronic product of a kind of electronic display to protect, in the use, with draw-in groove 21 embedding electronic display's side, in order to realize packing buffer material 2's inlay card installation.
Example 1:
the embodiment of the application discloses a buffer material forming process. Referring to fig. 2, a molding apparatus used in the process includes a core mold 3, a side press mold 4, a hydraulic cylinder 5, a heating rod 6, a frame 7, and the like, wherein the core mold 3 and the side press mold 4 are arranged in a long straight rod shape, and the core mold 3 and the side press mold 4 are made of a heat conductive metal material, for example, in the present embodiment, the core mold 3 and the side press mold 4 are made of cast iron, and may be made of an aluminum alloy or a copper alloy material. The core mold 3 is arranged along the horizontal direction, one end of the core mold 3 is fixedly arranged on the rack 7, the cross section of the core mold 3 is arranged in a U shape, so that the shape of the cross section is consistent with the inner edge profile of the packaging buffer material 2, the core mold 3 is used for placing paper tubes, and when the paper tubes are installed, the paper tubes can be sleeved and placed along the horizontal direction from one end, far away from the rack 7, of the core mold 3.
Referring to fig. 3, the side press dies 4 are fixedly mounted on the telescopic rods of the hydraulic cylinders 5, the hydraulic cylinders 5 are fixedly mounted on the frame 7, the telescopic rods of the hydraulic cylinders 5 face the core dies 3, the core dies 3 are parallel to the side press dies 4, the hydraulic cylinders 5 are started, the hydraulic cylinders 5 can drive the side press dies 4 to move towards or away from the core dies 3, and the side press dies 4 can press the paper tube on the core dies 3 to extrude one side of the paper tube. The hydraulic cylinders 5 and the side pressing dies 4 connected with each other are four groups, the four groups of side pressing dies 4 are respectively positioned on the upper side and the lower side of the core die 3 and the left side and the right side in the horizontal direction, and at this time, the four side pressing dies 4 can respectively press the periphery of the paper tube, so that the whole packaging buffer material 2 is molded. Here, the working pressure of the hydraulic cylinder 5 may be selected to be 2 tons to 3 tons to meet the forming requirement of the workpiece, and in this embodiment, the working pressure of the hydraulic cylinder 5 is selected to be 2 tons for example.
Meanwhile, referring to fig. 5, a boss 41 is protruded downward from the middle of the side press mold 4 above the core mold 3, the boss 41 extends along the length direction of the side press mold 4, and the boss 41 is integrally connected with the side press mold 4; meanwhile, the middle part of the core mold 3 is provided with a groove 31, specifically, the groove 31 is concavely arranged at the top part of the core mold 3 from outside to inside, two ends of the groove 31 respectively extend to two ends of the core mold 3 along the length direction of the core mold 3, the boss 41 is opposite to the groove 31, and the boss 41 and the groove 31 are mutually matched in an inserted manner in the moving process of the side pressing mold 4; in the process, the top of the paper tube can form a clamping groove 21 under the mutual insertion effect between the boss 41 and the groove 31, and the gap between the surface of the boss 41 and the groove wall of the groove 31 can be determined to be consistent with the thickness of the paper tube so as to meet the requirement of the bending space of the paper tube.
Furthermore, two side dies 4 on two sides of the core die 3 can be respectively provided with a convex forming protrusion 42, and meanwhile, two side surfaces of the core die 3 on the back in the horizontal direction can be respectively provided with a concave forming groove 32 for the convex forming protrusion 42 to be inserted and matched, and here, under the mutual insertion of the convex forming protrusion 42 and the forming groove 32, two sides of the packaging cushioning material 2 can be pressed and pressed to form a reinforcing rib so as to enhance the overall structural strength of the packaging material.
In addition, in order to meet the specific length setting requirement of the workpiece, the length of the core mold 3 is between 5cm and 200cm, for example, 5cm, 50cm, 80cm, 100cm, 120cm, 150cm, 180cm or 200cm, and the like, and the core molds 3 with different dimensions can be respectively used for placing paper tubes with different length dimensions, so as to meet different dimensions of the packaging buffer material 2; meanwhile, the core mold 3 can also accommodate a plurality of paper tubes with smaller sizes and lengths so as to synchronously mold a plurality of packaging buffer materials 2, and the use is flexible; meanwhile, due to the limitation of the installation position of the frame 7, the side pressing dies 4 should be slightly smaller than the setting length of the core dies 3, wherein the length of the side pressing dies 4 is close to that of the core dies 3, for example, the side pressing dies 4 can be 4cm smaller than the core dies 3, so as to reduce the possibility of collision between the side pressing dies 4 and the frame 7 when the side pressing dies 4 move; the specific length and size of the core mold 3 can be adaptively adjusted according to the number or length of the workpieces to be placed, and the specific set length of the core mold 3 is not limited herein.
With continued reference to fig. 4, after the paper tube is press-molded, the paper tube is heated to harden the paper tube, thereby reducing the possibility of deformation of the packaging cushioning material 2. Specifically, the heating rod 6 is respectively installed in the side pressing die 4 and the core die 3, wherein a mounting hole can be arranged at the core die 3 in a penetrating manner along the length direction, the heating rod 6 is inserted and installed in the mounting hole, so that the heating rod 6 is abutted against the core die 3, and the heating rod 6 is installed at the side pressing die 4; meanwhile, the side pressing die 4 can be concavely provided with a mounting groove along the length direction, the heating rod 6 is embedded and fixed in the mounting groove so as to realize the fixed mounting of the heating rod 6 at the side pressing die 4, and the process is convenient and fast. It should be noted that the side press mold 4 on the top of the core mold 3 has a thicker thickness due to the existence of the boss 41, and here, in order to achieve uniform heat dissipation, a mounting hole may be formed at the side press mold 4 on the top of the core mold 3, and the heating rod 6 is inserted into the mounting hole to meet the heat dissipation requirement; the heating rod 6 is externally connected with a temperature controller, the heating rod 6 can be heated and the temperature of the core mold 3 can be controlled by starting the temperature controller, and heat can be conducted to the core mold 3 and the side pressing mold 4 to heat the core mold 3 and the side pressing mold 4.
Further, the number of the heating rods 6 provided at the core mold 3 and the side mold 4 is two, and the two core molds 3 and the side molds 4 are uniformly arranged at the core mold 3 and the side molds 4, respectively, to increase the heating speed of the core mold 3 and the side molds 4, generally, the heating power of the heating rods 6 is between 800w and 1200w, such as 800w, 1000w, 1200w, and the like, in the embodiment, the heating power of the heating rods 6 is 1000w, and the specific heating power of the heating rods 6 can be selected according to the actual manufacturing cost, and the heating power of the heating rods 6 is not limited herein.
Here, when the core mold 3 and the side pressing mold 4 extrude the paper tube, the core mold 3 and the side pressing mold 4 can bake the inner side and the outer side of the paper tube, so that the package buffer material 2 is hardened, and the rebound resetting performance and the buffering performance of the package buffer material 2 are improved.
Referring to fig. 4, the buffer material molding process includes the steps of:
s1, preparing a base material 1, wherein a kraft paper cylinder is selected as the paper cylinder, in the manufacturing process of the kraft paper cylinder, twill winding is carried out on kraft paper by using a paper tube machine, and the kraft paper with different paper layers is bonded and fixed by using environment-friendly glue; the original rod is then air-dried to solidify the glue, and then the original rod is cut by a paper tube cutting machine to form paper tubes with specific length dimensions, the specific length value of the paper tube can be specifically adjusted according to the product requirements, no limitation is made on the specific length of the paper tube, meanwhile, the wall thickness of the paper tube ranges from 1mm to 3mm, and in the embodiment, the thickness of the paper tube is set to 1mm for example.
S2, debugging equipment, wherein the heating rod 6 is started firstly, the side pressing die 4 and the core die 3 are respectively heated to 110-130 ℃, the temperature of the side pressing die 4 and the core die 3 is raised, and in the embodiment, the heating temperature of the core die 3 and the side pressing die 4 is set to 110 ℃.
S3, placing the base material 1, wherein the paper tube is sleeved to the core mold 3 along the horizontal direction to achieve placement;
and S4, starting the equipment, more specifically, starting the hydraulic cylinder 5, so that the telescopic rod of the hydraulic cylinder 5 extends and retracts to enable the side pressing die 4 to move towards the core die 3 and be matched with the core die 3, and the paper tube is deformed under the extrusion action of the side pressing die 4 and the core die 3.
In the pressing process, one side pressing die 4 of the four side pressing dies 4 is started first and kept in a pressing state, in the embodiment, the side pressing die 4 positioned at the top of the core die 3 is started first, at the moment, the boss 41 is inserted into the groove 31, and the paper tube is clamped and positioned, so that the paper tube is not easy to deviate; then, the rest side pressing dies 4 are started, the rest side pressing dies 4 can accurately perform side pressing forming on the rest part of the paper tube, the integral forming precision of the workpiece is improved, and usually, in order to improve the processing efficiency, the side pressing dies 4 on the left side, the right side and the lower side of the displacement core die 3 can be started simultaneously to achieve the effect of synchronous punching; in addition, the interval time of the side pressing dies 4 started successively can be shortened as much as possible, for example, to 1s or less, so that the processing efficiency of the paper tube can be improved as much as possible on the premise of satisfying the clamping and positioning.
And S5, maintaining the extrusion action for 50S-70S, wherein the extrusion action is maintained for 50S in the embodiment, namely the side pressing die 4 and the core die 3 bake the paper tube for 50S, and the paper tube achieves baking hardening.
And S6, starting the equipment to enable the side pressing die 4 to return, more specifically, starting the telescopic cylinder to enable the telescopic rod of the telescopic cylinder to contract, and enabling the side pressing die 4 to be far away from the core die 3.
And S7, taking the workpiece out of the core mold 3 to finally obtain the packaging buffer material 2.
Experiments show that 24-inch display screens are selected, the buffering packaging materials are sleeved on the side edges of the display screens, the display screens are dropped from the height of 0.5 meter, after the operation is repeated for 10 times, the screen display is normal and is not damaged, and the use requirements are met.
Example 2:
the difference between this example and example 1 is that the working pressure of the hydraulic cylinder was 2.5 tons, the thickness of the paper web was 2mm, the baking temperature was 120 degrees celsius, and the holding time of the pressing operation was set to 60 seconds.
Experiments show that 24-inch display screens are selected, the buffering packaging materials are sleeved on the side edges of the display screens, the display screens are dropped from the height of 0.5 meter, after the operation is repeated for 10 times, the screen display is normal and is not damaged, and the use requirements are met.
Example 3:
the difference between this example and example 1 is that the working pressure of the hydraulic cylinder was 3 tons, the thickness of the paper web was 3mm, the baking temperature was 130 degrees celsius, and the holding time of the pressing operation was set to 70s.
Experiments show that 24-inch display screens are selected, the buffering packaging materials are sleeved on the side edges of the display screens, the display screens are dropped from the height of 0.5 meter, after the operation is repeated for 10 times, the screen display is normal and is not damaged, and the use requirements are met.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (5)
1. A buffer material forming process is characterized by comprising the following steps:
s1, preparing a base material (1), wherein a paper cylinder is used as the base material (1), and the paper cylinder is a kraft paper cylinder;
s2, debugging equipment, wherein the equipment is provided with a core mould (3) and side pressing moulds (4) positioned on one side of the core mould (3), the number of the side pressing moulds (4) is four, the four side pressing moulds (4) are respectively positioned on the upper side, the lower side, the left side and the right side of the core mould (3), the temperature of the side pressing moulds (4) and the core mould (3) is raised, the heating temperature in the step S2 is 110-130 ℃, the maintaining time of the extrusion action in the step S5 is 50-70S, a boss (41) is arranged in the middle of each side pressing mould (4), a groove (31) is arranged in the middle of the core mould (3), and the boss (41) and the groove (31) are mutually inserted and matched;
s3, placing the base material (1), and sleeving the paper tube to the position of the core mold (3) to realize placement;
s4, starting equipment to enable the side pressing die (4) to move towards the core die (3) and be matched with the core die (3) to extrude and deform the paper tube, wherein heating rods (6) are respectively installed in the side pressing die (4) and the core die (3), the side pressing die (4) and the core die (3) are both made of heat-conducting metal, the number of the heating rods (6) is two, and the heating power of the heating rods (6) is between 800w and 1200 w;
s5, keeping the extrusion action, and baking and hardening the paper tube by the side pressing die (4) and the core die (3);
s6, starting the equipment to enable the side pressing die (4) to return;
s7, taking the workpiece out of the core mold (3).
2. The process of claim 1, wherein: the equipment comprises a hydraulic cylinder (5), wherein a side pressing die (4) is fixedly arranged on the hydraulic cylinder (5), and the working pressure of the hydraulic cylinder (5) is 2 tons to 3 tons.
3. The process for molding a cushioning material according to claim 1, wherein: in step S4, one of the four side dies (4) is first actuated and held in a pressed state, and then the remaining side dies (4) are actuated.
4. The process of claim 1, wherein: the paper tube is formed by firstly winding kraft paper and bonding the kraft paper by environment-friendly glue, and then cutting the original rod to form the paper tube.
5. The process of claim 1, wherein: the length of the core mould (3) is 5 cm-200 cm.
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| WO2020127147A1 (en) * | 2018-12-19 | 2020-06-25 | Société des Produits Nestlé S.A. | Manufacturing process for producing hermetic single-use food containers such as coffee pods, including a creasing step |
| WO2020230720A1 (en) * | 2019-05-16 | 2020-11-19 | 凸版印刷株式会社 | Cover material, method for manufacturing cover material, and pulp mold molding mold |
| CN110962397A (en) * | 2019-12-16 | 2020-04-07 | 山东中际智能装备有限公司 | Insulating paper forming die |
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