CN111152436A - Environment-friendly stone paper extrusion molding screw, extruder and stone paper production process - Google Patents
Environment-friendly stone paper extrusion molding screw, extruder and stone paper production process Download PDFInfo
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- CN111152436A CN111152436A CN202010064107.8A CN202010064107A CN111152436A CN 111152436 A CN111152436 A CN 111152436A CN 202010064107 A CN202010064107 A CN 202010064107A CN 111152436 A CN111152436 A CN 111152436A
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- stone paper
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- 239000004575 stone Substances 0.000 title claims abstract description 40
- 238000001125 extrusion Methods 0.000 title claims abstract description 32
- 238000004519 manufacturing process Methods 0.000 title abstract description 12
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 26
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 32
- 238000002844 melting Methods 0.000 claims description 25
- 230000008018 melting Effects 0.000 claims description 25
- 230000006835 compression Effects 0.000 claims description 18
- 238000007906 compression Methods 0.000 claims description 18
- 238000000265 homogenisation Methods 0.000 claims description 18
- 239000002994 raw material Substances 0.000 claims description 18
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 12
- 230000008569 process Effects 0.000 claims description 12
- 230000000903 blocking effect Effects 0.000 claims description 9
- 238000002156 mixing Methods 0.000 claims description 9
- 238000000926 separation method Methods 0.000 claims description 9
- HQKMJHAJHXVSDF-UHFFFAOYSA-L magnesium stearate Chemical compound [Mg+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O HQKMJHAJHXVSDF-UHFFFAOYSA-L 0.000 claims description 8
- 239000000498 cooling water Substances 0.000 claims description 7
- 239000002245 particle Substances 0.000 claims description 6
- 235000007119 Ananas comosus Nutrition 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 5
- 238000000071 blow moulding Methods 0.000 claims description 4
- 235000019359 magnesium stearate Nutrition 0.000 claims description 4
- XOOUIPVCVHRTMJ-UHFFFAOYSA-L zinc stearate Chemical compound [Zn+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O XOOUIPVCVHRTMJ-UHFFFAOYSA-L 0.000 claims description 4
- 239000004698 Polyethylene Substances 0.000 claims description 3
- -1 polyethylene Polymers 0.000 claims description 3
- 229920000573 polyethylene Polymers 0.000 claims description 3
- 230000011218 segmentation Effects 0.000 claims description 3
- 238000005303 weighing Methods 0.000 claims description 3
- 244000099147 Ananas comosus Species 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 66
- 230000000694 effects Effects 0.000 description 14
- 229910052500 inorganic mineral Inorganic materials 0.000 description 5
- 239000011707 mineral Substances 0.000 description 5
- 241000234671 Ananas Species 0.000 description 4
- 239000000126 substance Substances 0.000 description 3
- 238000007664 blowing Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000012768 molten material Substances 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 235000019738 Limestone Nutrition 0.000 description 1
- 239000006057 Non-nutritive feed additive Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000010309 melting process Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0017—Combinations of extrusion moulding with other shaping operations combined with blow-moulding or thermoforming
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/022—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the choice of material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
- B29C48/10—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels flexible, e.g. blown foils
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/50—Details of extruders
- B29C48/505—Screws
- B29C48/59—Screws characterised by details of the thread, i.e. the shape of a single thread of the material-feeding screw
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/50—Details of extruders
- B29C48/505—Screws
- B29C48/64—Screws with two or more threads
- B29C48/65—Screws with two or more threads neighbouring threads or channels having different configurations, e.g. one thread being lower than its neighbouring thread
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/50—Details of extruders
- B29C48/68—Barrels or cylinders
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/50—Details of extruders
- B29C48/76—Venting, drying means; Degassing means
- B29C48/765—Venting, drying means; Degassing means in the extruder apparatus
- B29C48/766—Venting, drying means; Degassing means in the extruder apparatus in screw extruders
- B29C48/767—Venting, drying means; Degassing means in the extruder apparatus in screw extruders through a degassing opening of a barrel
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
- C04B26/02—Macromolecular compounds
- C04B26/04—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B26/045—Polyalkenes
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00017—Aspects relating to the protection of the environment
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The invention relates to an environment-friendly stone paper extrusion molding screw, which comprises a shaft part, a connecting handle arranged at the end part of the shaft part and used for being connected to extrusion equipment, and a thread arranged on the shaft part, wherein a pressure stabilizing section is arranged on the screw; the shaft part of the pressure stabilizing section is of equal diameter and the thread is of equal pitch, the rear chamfer R2 of the thread of the pressure stabilizing section is 2-3 times of the angle of the front chamfer R1, the radius range corresponding to the front chamfer R1 of the thread of the pressure stabilizing section is 3-7 mm, and the radius range corresponding to the rear chamfer R2 is 6-19 mm. The invention relates to an environment-friendly stone paper extruder which comprises a screw and a screw barrel. The invention also relates to a production process of the stone paper. The invention has good dispersibility to the material, stable extrusion capacity and extrusion pressure, and is particularly suitable for the extrusion production of stone paper formula materials.
Description
Technical Field
The invention relates to the field of environment-friendly stone paper production equipment, in particular to an environment-friendly stone paper extrusion molding screw, an extruder and a stone paper production process.
Background
The stone paper is a novel material between paper and plastic, can replace the traditional partial functional paper and professional paper, and can also replace the traditional most plastic packing materials. It can save a great deal of forest resources for society, and can reduce secondary pollution generated in the paper-making process. The stone paper is prepared by using limestone mineral resources with large reserves and wide distribution as a main raw material (the content of calcium carbonate is 70-80%), using a high-molecular polymer as an auxiliary material (the content is 20-30%), using the characteristics of a high-molecular interface chemical principle and high-molecular modification, performing special process treatment, and then adopting polymer extrusion and blow molding processes. However, in the prior art, when the addition amount of calcium carbonate exceeds 70%, the fluidity of the material in a molten state is poor, and when an extruder operates on the material, the material cannot achieve good dispersibility and extrusion stability, so that the production and the manufacture of the stone paper are affected.
Disclosure of Invention
The invention aims to solve the problem that when the addition amount of calcium carbonate in a material exceeds 70% in the production of stone paper, the extrusion stability of the material is poor, and provides an environment-friendly stone paper extrusion molding screw, an extruder and a stone paper production process.
In order to achieve the purpose, the technical scheme of the invention is as follows:
an environment-friendly stone paper extrusion molding screw comprises a shaft part, a connecting handle arranged at the end part of the shaft part and used for being connected to extrusion equipment, and threads arranged on the shaft part, wherein a pressure stabilizing section is arranged on the screw; the shaft part of the pressure stabilizing section is of equal diameter and the thread is of equal pitch, the rear chamfer R2 of the thread of the pressure stabilizing section is 2-3 times of the angle of the front chamfer R1, the radius range corresponding to the front chamfer R1 of the thread of the pressure stabilizing section is 3-7 mm, and the radius range corresponding to the rear chamfer R2 is 6-19 mm.
Further, the screw rod is further provided with a homogenizing section, the homogenizing section is located between the connecting handle and the pressure stabilizing section, the diameter of the shaft portion of the homogenizing section is gradually increased, the homogenizing section is provided with a main thread and an auxiliary thread, the outer diameter of the main thread is larger than that of the auxiliary thread, the thread pitch of the auxiliary thread is larger than that of the main thread, a first spiral groove is formed between the main thread and the auxiliary thread, the bottom diameter of the first spiral groove is equal to the diameter of the first spiral groove, and the bottom diameter of one end, close to the connecting handle, of the first spiral groove is larger than that of the shaft portion of the homogenizing section.
Furthermore, one end of the auxiliary thread facing the connecting handle is in closed intersection with the main thread, and the other end of the auxiliary thread and the main thread form an opening shape.
Furthermore, a feeding section and a melting section are sequentially arranged between the connecting handle and the homogenizing section, the shaft parts of the feeding section and the melting section are equal in diameter and thread pitch, and the thread crest of the melting section is provided with a reverse flow notch; quantitative section, separation section, negative pressure exhaust section and compression section have set gradually between homogenization section and the steady voltage section, the axial region isodiametric, the pitch such as screw thread of quantitative section, the separation section is two segmentation pineapple head structures to crisscross the setting, the axial region of negative pressure exhaust section is less than the axial region diameter of separation section.
The environment-friendly stone paper extruder comprises a screw barrel and a screw, wherein the compression ratio range of a compression section is 1.5-2.0.
Furthermore, the screw barrel comprises a blanking section, the blanking section corresponds to the feeding section in position, a blanking port is formed in the blanking section, a plurality of feeding spiral grooves are formed in the blanking section, the depth of each feeding spiral groove is gradually reduced from back to front along the screw, the rotating direction of each feeding spiral groove is opposite to that of the screw, the screw barrel is provided with heating devices corresponding to the melting section, the homogenizing section, the quantifying section, the blocking section, the compression section and the pressure stabilizing section, and the screw barrel is provided with a vacuum exhaust window corresponding to the negative pressure exhaust section of the screw.
Further, a cooling water jacket is arranged on the blanking section and is positioned on the rear side of the blanking port.
Further, the screw cylinder also comprises a homogenization exhaust section, the homogenization exhaust section corresponds to the negative pressure exhaust section in position, the vacuum exhaust window is arranged on the homogenization exhaust section, a homogenization groove is arranged on the homogenization exhaust section along the direction of the vacuum exhaust window, and the homogenization groove is communicated with the vacuum exhaust window.
Furthermore, the radial section of the homogenizing groove is arc-shaped, the axial direction of the homogenizing groove is greater than the length of the vacuum exhaust window, and the homogenizing groove is in a tapered head shape which is gradually reduced and closed at one end far away from the vacuum exhaust window.
The process for producing the stone paper by using the extruder comprises the following steps:
a, weighing raw materials: 74-77% of heavy calcium carbonate, 20-23% of polyethylene, 1-2% of zinc stearate and 1-2% of magnesium stearate;
B. b, feeding the raw materials obtained in the step A into an internal mixer to obtain raw material particles for papermaking;
C. and C, connecting the extrusion end of the extruder with an O-shaped die head through a connecting pipe, feeding the raw material particles obtained in the step B into the extruder, mixing, melting, extruding and blow-molding the raw materials to obtain the calcium carbonate environment-friendly paper film, wherein the process parameters of the extruder are as follows: the length-diameter ratio of the screw is 36:1, the temperatures of the feeding section, the melting section and the homogenizing section are 155-160 ℃, the temperature of the quantifying section is 155 ℃, the temperatures of the blocking section, the negative pressure exhaust section, the compression section and the pressure stabilizing section are 160-165 ℃, the temperature of the connecting pipe is 165 ℃, the temperature of the O-shaped die head is 170 ℃, the rotation speed of the screw is 50-55 r/min, and the pressure of the O-shaped die head is 35-45 MPa.
Through the technical scheme, the invention has the beneficial effects that:
the screw rod comprises a pressure stabilizing section, a screw thread, a front chamfer R1, a rear chamfer R2, a front chamfer R1 and a rear chamfer R2, wherein the pressure stabilizing section is provided with a constant diameter and a constant thread pitch, the rear chamfer R2 is 2-3 times of the angle of the front chamfer R1, so that the pressure and the stable extrusion effect of materials are guaranteed, the radius range corresponding to the front chamfer R1 of the screw thread of the pressure stabilizing section is 3-7 mm, the radius range corresponding to the rear chamfer R2 is 6-19 mm, the front chamfer R1 is smaller so as to guarantee that the screw rod can provide enough thrust for the materials to achieve the extrusion effect, the rear chamfer R2 is larger than R1, so that the contact area with the materials is increased, the friction force between the materials and the screw rod is increased, and the effects of independent spiral internal backflow and pressure stabilization are.
The screw rod is provided with the melting section, the thread crest of the melting section is provided with the reverse flow notch, when conveyed materials advance, the materials are easy to flow out of the reverse flow notch under the pushing and extruding of the screw rod and flow into the adjacent spiral grooves, and the effects of quantifying, mixing and pressure-stabilizing feeding of the materials are achieved; the axial region diameter grow gradually of homogenization section to be provided with main thread and vice screw thread, the external diameter of main thread is greater than the external diameter of vice screw thread, and when transporting the material, the clearance of the capping of material accessible vice screw thread is in the helicla flute to vice screw thread against the current, makes the material reach the purpose of nonlinear cross mixing, further promotes the material and mixes the effect, promotes the dispersibility of calcium carbonate in whole material.
The extruder comprises a screw and a screw barrel, wherein the discharging section of the screw barrel is provided with a plurality of feeding spiral grooves, the rotating direction of the feeding spiral grooves is opposite to that of the screw, the friction force between materials and the screw barrel is increased, the feeding amount and the feeding stability are increased, and the extruder is more suitable for the material formula production and processing of stone paper. The position of the screw barrel corresponding to the negative pressure exhaust section of the screw is a homogenizing exhaust section, and a homogenizing groove is arranged on the homogenizing exhaust section along the direction of the vacuum exhaust window, so that materials form a vortex at the position, and the purposes of full exhaust, material homogenization and stable output are achieved.
According to the process for producing the stone paper, the heavy calcium carbonate adopted as the raw material is not required to be activated in advance, the cost is low, the process is simple, only two processing aids including zinc stearate and magnesium stearate are adopted, the formula is simple, the cost is low, toxic and harmful substances and sensitive substances are not added, the material is good in environmental friendliness, the screw and the extruder comprising the screw are used, different temperatures are adopted at different positions of the screw, the using effect is good, the process can adapt to the material proportion of the high calcium carbonate in the ingredients, and the proportion can reach 74% -77%, and the produced stone paper is good in performance.
Drawings
FIG. 1 is a schematic structural diagram of an environment-friendly rich mineral paper extrusion molding screw of the invention;
FIG. 2 is a schematic view of the homogenization section of the present invention;
FIG. 3 is an enlarged view of a portion of FIG. 1 at D;
FIG. 4 is a schematic view of the construction of the barrier section of the present invention;
FIG. 5 is a schematic sectional view A-A of FIG. 1;
FIG. 6 is a schematic view of a seal slot of the present invention;
FIG. 7 is a schematic view of the structure of the extruder of the present invention;
FIG. 8 is a schematic structural view of the barrel of the present invention;
FIG. 9 is an enlarged partial schematic view of FIG. 8;
FIG. 10 is a schematic cross-sectional view taken at B-B of FIG. 9;
fig. 11 is a schematic sectional view at C-C of fig. 8.
The reference numbers in the drawings are as follows: 1 is the connecting handle, 101 is the seal groove, 2 is the feeding section, 3 is the melting section, 301 is the palirrhea notch, 4 is the homogenization section, 401 is the main thread, 402 is vice screw thread, 403 is first helical groove, 5 is the ration section, 6 is the separation section, 7 is negative pressure exhaust section, 8 is the compression section, 9 is the steady pressure section, 10 is the barrel, 11 is the unloading section, 1101 is the feed opening, 1102 is the feed helical groove, 1103 is cooling water jacket, 12 is heating device, 1201 is the electric heat piece, 1202 is the thermocouple, 13 is the vacuum exhaust window, 14 is the homogenization exhaust section, 1401 is the homogenization recess.
Detailed Description
The invention is further described with reference to the following figures and detailed description:
in the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", "axial", "radial", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in fig. 1, and further, the terms "front" and "rear", which are the directions in which the screw advances the material, "front", and vice versa, "rear", are only used for convenience of description and simplification of the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
As shown in fig. 1 to 6, an environment-friendly stone paper extrusion molding screw comprises a shaft portion, a connecting handle 1 arranged at the end of the shaft portion and used for being connected to an extrusion device, and threads arranged on the shaft portion, wherein the screw needs to be matched with a screw barrel during operation so as to achieve the purpose of extrusion molding of materials, feeding is carried out at the rear end of the screw, and discharging is carried out at the front end of the screw. The screw rod is provided with a pressure stabilizing section 9; the axial part of steady voltage section 9 is the same diameter, and screw thread constant pitch, the screw thread rear side chamfer R2 of steady voltage section 9 is 2 ~ 3 times of front side chamfer R1 angle, and ration, stable promotion material advance, extrude to guarantee the pressure and the stability of material and extrude the effect. The radius scope that the front side chamfer R1 of the screw thread of surge segment 9 corresponds is 3 ~ 7mm, the radius scope that corresponds of rear side chamfer R2 is 6 ~ 19mm, front side chamfer R1 is slightly little in order to guarantee that the screw rod can provide sufficient thrust for the material and realize the extrusion effect, rear side chamfer R2 is great than R1 then increased the area of contact with the material, make frictional force increase between material and the screw rod, reach the effect of independent spiral internal reflux and steady voltage.
Specifically, the front end of the connecting handle 1 is provided with a sealing groove 101, and the screwing direction of the sealing groove 101 is the same as that of the screw threads on the screw rod, so that materials are prevented from reversely moving at the position.
The screw is further provided with a homogenizing section 4, the homogenizing section 4 is located between the connecting handle 1 and the pressure stabilizing section 9, the diameter of the shaft portion of the homogenizing section 4 is gradually increased, the homogenizing section 4 is provided with a main thread 401 and an auxiliary thread 402, and the outer diameter of the main thread 401 is larger than that of the auxiliary thread 402. The homogenization section 4 adopts a main and auxiliary thread structure, so that materials in a molten state enter the spiral section of the main thread 401 to be molten, and then enter the spiral groove of the auxiliary thread 402 through the crest clearance of the auxiliary thread 402 in a countercurrent manner, and the materials achieve the effect of nonlinear cross mixing. The screw pitch of vice screw thread 402 is greater than the screw pitch of main thread 401, and vice screw thread 402 screw pitch is greater than main thread 401 screw pitch for the assurance, and in the continuous melting process of material, can have more and more material to enter into the thread groove of vice screw thread 402 when the screw rod is carried forward, in first helicla flute 403 promptly, guarantee material quantity in first helicla flute 403, make the melting material can be carried forward through vice screw thread 402 completely. A first spiral groove 403 is formed between the main thread 401 and the auxiliary thread 402, the bottom diameter of the first spiral groove 403 is equal, and the bottom diameter of one end close to the connecting handle 1 is larger than the diameter of the shaft part of the homogenizing section 4, so that the first spiral groove 403 can be filled with materials which enter the first spiral groove 403 from the crest of the auxiliary thread 402 in a reverse flow manner, the first spiral groove 403 can better extrude and push the materials to advance, and the purpose of cross mixing with the materials in the main thread 401 is achieved.
Furthermore, one end of the auxiliary thread 402 facing the connecting handle 1 is intersected with the main thread 401 in a closed manner, and the other end of the auxiliary thread is in an opening shape with the main thread 401, so that the material in a molten state flows back into a spiral groove of the auxiliary thread through a crest gap of the auxiliary thread 402, and is extruded and conveyed to the next section through an opening at the other end of the auxiliary thread 402.
Through homogenization section 4 that sets up on the screw rod, make the rich mineral paper material after getting into homogenization section 4, can realize carrying in the vice screw thread 402 through the crest reverse flow of vice screw thread 402 after the melting, the opening extrusion between rethread vice screw thread 402 end and the main thread 401 is carried to the hypomere to further promote the effect of the non-linear cross mixing after the rich mineral paper material melting, promote the dispersibility of calcium carbonate in the material.
The feeding section 2 and the melting section 3 are sequentially arranged between the connecting handle 1 and the homogenizing section 4, and the shaft parts of the feeding section 2 and the melting section 3 are equal in diameter and thread pitch. The arrangement of the feeding section 2 is such that the screw provides sufficient feeding space when in use. Further improving the dispersibility of the calcium carbonate and the mixing effect of the materials, and a reverse flow notch 301 is formed in the thread crest of the melting section 3; it is specific, the quantity of palirrhea notch 301 is a plurality of, the interval sets up, when the screw rod is when the operation, the screw rod is at the barrel internal rotation, the material is after 3 melts in melting section, be full of screw thread crest and axial part, in the space of the helicla flute between the barrel, along with the rotation of screw rod, the material that the drive is full of the helicla flute advances forward and extrudees, be full of unnecessary material behind a helicla flute just through the palirrhea notch 301 on screw thread top or the motion in the opposite direction that the screw rod promoted, thereby get into in the helicla flute of adjacent spiral, reach the ration to the material, mix, the effect that the steady voltage was carried.
A quantitative section 5, a blocking section 6, a negative pressure exhaust section 7 and a compression section 8 are sequentially arranged between the homogenizing section 4 and the pressure stabilizing section 9. The shaft part of the quantitative section 5 has the same diameter and the same thread pitch, and the homogenizing section 4 and the blocking section 6 are connected, so that the molten material is quantitatively conveyed to the lower section. The separation section 6 is two segmentation pineapple head structures to crisscross setting, it is specific, the short helical structure of pineapple hair style structure for being provided with many helices, the crest of two pineapple hair style structures is corresponding with the root of a tooth, realizes the one-way of material and passes through, and the separation material is palirrhea, and the simultaneous control material velocity of flow and flow realize when 8 exhaust in negative pressure exhaust section, can stabilize the exhaust and not give off the material. The shaft part of the negative pressure exhaust section 7 is smaller than the diameter of the shaft part of the blocking section 6, the negative pressure exhaust section 7 is provided with a double-thread structure, threads are equal in thread pitch, and water vapor and mixed air in materials are discharged at the section. The diameter of the shaft part of the compression section 8 is gradually increased, the thread of the compression section 8 has the same pitch, and the flowability of the stone paper material is ensured through the compression ratio established by the section.
As shown in fig. 1 to 11, an environment-friendly rich mineral paper extruder includes a screw and a screw barrel 10 in the embodiment, and specifically, the compression ratio of the compression section 8 is in a range of 1.5 to 2.0.
The screw barrel 10 comprises a blanking section 11, the blanking section 1 corresponds to the feeding section 2, a blanking opening 1101 is formed in the blanking section 11, a plurality of feeding spiral grooves 1102 are formed in the blanking section 11, the depth of the feeding spiral grooves 1102 gradually becomes shallow along the screw from back to front from the blanking opening 1101, the rotating direction of the feeding spiral grooves 1102 is opposite to the rotating direction of the screw, and the friction force between the material and the screw barrel 10 is increased. The barrel 10 is provided with heating device 12 corresponding to the screw melting section 3, the homogenizing section 4, the quantifying section 5, the blocking section 6, the compressing section 8 and the pressure stabilizing section 9, the barrel 10 is provided with a vacuum exhaust window 13 corresponding to the screw negative pressure exhaust section 7, the heating device 12 comprises an electric heating piece 1201 and a thermocouple 1202, and stable temperature control and accurate temperature difference control are achieved.
Still be provided with cooling water jacket 1103 on the unloading section 11, cooling water jacket 1103 is located the rear side of feed opening 1101, and the cooling water jacket 1103 is interior to lead to cold water and is cooled down feed opening 1101, and screw barrel 10 cooperates with the screw structure combined action, increases feed volume and feed stability, more is fit for the material formula production and processing of stone paper.
The screw barrel 10 further comprises a homogenizing exhaust section 14, the homogenizing exhaust section 14 corresponds to the negative pressure exhaust section 7 in position, the vacuum exhaust window 13 is arranged on the homogenizing exhaust section 14, a homogenizing groove 1401 is arranged on the homogenizing exhaust section 14 along the direction of the vacuum exhaust window 13, and the homogenizing groove 1401 is communicated with the vacuum exhaust window 13.
The radial section of the homogenizing groove 1401 is arc-shaped, the axial direction of the homogenizing groove 1401 is larger than the length of the vacuum exhaust window 13, and one end far away from the vacuum exhaust window 13 is in a tapered head shape which is gradually reduced and closed, so that materials form a vortex at the position, and the purposes of full exhaust, material homogenization and stable output are achieved.
The process for producing the stone paper by using the extruder comprises the following steps:
a, weighing raw materials: 75% of heavy calcium carbonate, 23% of polyethylene, 1% of zinc stearate and 1% of magnesium stearate;
b, feeding the raw materials obtained in the step A into an internal mixer to obtain raw material particles for papermaking;
c, connecting the extrusion end of the extruder with an O-shaped die head through a connecting pipe, feeding the raw material particles obtained in the step B into the extruder, and mixing, melting, extruding and blow-molding the raw materials to obtain the calcium carbonate environment-friendly paper film; the specific process parameters are as follows: the diameter of the screw is 120mm, the length-diameter ratio is 36:1, the temperatures of the feeding section 2, the melting section 3 and the homogenizing section 4 are 155-160 ℃, the temperature of the quantitative section 5 is 155 ℃, the temperatures of the blocking section 6, the negative pressure exhaust section 7, the compression section 8 and the pressure stabilizing section 9 are 160-165 ℃, the temperature of the connecting pipe is 165 ℃, and the temperature of the die head is 170 ℃. The rotating speed of the screw is 52 revolutions per minute, the pressure of the die head is 41MPa, when a high-pressure high-melt-strength molten material is extruded by the O-shaped die head, a tubular material is formed, the tubular material is expanded transversely and longitudinally at the same time under the blowing pressure of 8 atmospheric pressures, the transverse blowing ratio reaches 5-8 times, the longitudinal stretching ratio reaches 8-10 times, and the calcium carbonate environment-friendly paper films with different thickness specifications and different width specifications can be obtained by cooling, shaping, edge cutting and rolling, so that the stone paper is obtained. The two-way blow-up ratio and the stretching ratio are large, the produced calcium carbonate environment-friendly paper film has the advantages of low density, high opacity and excellent physical properties, in the embodiment, the blow-up ratio is 6.1, and the stretching ratio is 8.5.
Through the screw and the extrusion structure, and the temperature values corresponding to different sections of the screw during use, a good stone paper raw material extrusion molding effect can be achieved, and the obtained stone paper has the following performance.
| Performance of | Numerical value |
| Thickness of | 130μm |
| Gram weight | 143g/cm2 |
| Density of | 1.1g/cm3 |
| Whiteness degree | 88％ |
| Opacity | 86％ |
| Stiffness of the sheet | 0.03N·m |
The above-described embodiments are merely preferred embodiments of the present invention, and not intended to limit the scope of the invention, so that equivalent changes or modifications in the structure, features and principles described in the present invention should be included in the claims of the present invention.
Claims (10)
1. An environment-friendly stone paper extrusion molding screw comprises a shaft part, a connecting handle (1) arranged at the end part of the shaft part and used for being connected to extrusion equipment, and threads arranged on the shaft part, and is characterized in that a pressure stabilizing section (9) is arranged on the screw; the shaft part of the pressure stabilizing section (9) is of equal diameter and equal thread pitch, the rear chamfer R2 of the thread of the pressure stabilizing section (9) is 2-3 times of the angle of the front chamfer R1, the radius range corresponding to the front chamfer R1 of the thread of the pressure stabilizing section (9) is 3-7 mm, and the radius range corresponding to the rear chamfer R2 is 6-19 mm.
2. The environment-friendly stone paper extrusion molding screw rod as claimed in claim 1, wherein a homogenizing section (4) is further arranged on the screw rod, the homogenizing section (4) is located between the connecting handle (1) and the pressure stabilizing section (9), the diameter of the shaft part of the homogenizing section (4) is gradually increased, the homogenizing section (4) is provided with a main thread (401) and an auxiliary thread (402), the outer diameter of the main thread (401) is larger than that of the auxiliary thread (402), the pitch of the auxiliary thread (402) is larger than that of the main thread (401), a first spiral groove (403) is formed between the main thread (401) and the auxiliary thread (402), the bottom diameter of the first spiral groove (403) is equal in diameter, and the bottom diameter of one end close to the connecting handle (1) is larger than that of the shaft part of the homogenizing section (4).
3. The environment-friendly stone paper extrusion molding screw rod as claimed in claim 2, wherein one end of the auxiliary thread (402) facing the connecting handle (1) is in closed intersection with the main thread (401), and the other end of the auxiliary thread forms an opening shape with the main thread (401).
4. The environment-friendly stone paper extrusion molding screw rod as claimed in claim 2, wherein a feeding section (2) and a melting section (3) are sequentially arranged between the connecting handle (1) and the homogenizing section (4), shaft parts of the feeding section (2) and the melting section (3) are equal in diameter and thread pitch, and a reverse flow notch (301) is formed in the thread crest of the melting section (3); quantitative section (5), separation section (6), negative pressure exhaust section (7) and compression section (8) have set gradually between homogenization section (4) and steady voltage section (9), the axial region constant diameter, the thread constant pitch of quantitative section (5), separation section (6) are two segmentation pineapple head structures to crisscross the setting, the axial region of negative pressure exhaust section (7) is less than the axial region diameter of separation section (6).
5. An environment-friendly stone paper extruder, which is characterized by comprising a screw barrel (10) and a screw rod as claimed in any one of claims 1 to 4, wherein the compression ratio of the compression section (8) is in the range of 1.5 to 2.0.
6. The environment-friendly stone paper extruder as claimed in claim 5, wherein the screw barrel (10) comprises a blanking section (11), the blanking section (11) corresponds to the feeding section (2), the blanking section (11) is provided with a blanking port (1101), a plurality of feeding spiral grooves (1102) are arranged in the blanking section (11), the depth of the feeding spiral grooves (1102) gradually becomes shallow along the screw from back to front, the rotating direction of the feeding spiral grooves (1102) is opposite to the rotating direction of the screw, the screw barrel (10) is provided with heating devices (12) corresponding to the melting section (3), the homogenizing section (4), the quantifying section (5), the blocking section (6), the compression section (8) and the pressure stabilizing section (9), and the screw barrel (10) is provided with a vacuum exhaust window (13) corresponding to the negative pressure exhaust section (7) of the screw.
7. The environment-friendly stone paper extruder as claimed in claim 6, wherein the blanking section (11) is further provided with a cooling water jacket (1103), and the cooling water jacket (1103) is located at the rear side of the blanking port (1101).
8. The environment-friendly stone paper extruder as claimed in claim 6, wherein the screw barrel (10) further comprises a homogenizing exhaust section (14), the homogenizing exhaust section (14) corresponds to the negative pressure exhaust section (7), the vacuum exhaust window (13) is arranged on the homogenizing exhaust section (14), the homogenizing exhaust section (14) is provided with a homogenizing groove (1401) along the direction of the vacuum exhaust window (13), and the homogenizing groove (1401) is communicated with the vacuum exhaust window (13).
9. The environment-friendly stone paper extruder as claimed in claim 8, wherein the radial section of the homogenizing groove (1401) is arc-shaped, the homogenizing groove (1401) is axially longer than the length of the vacuum exhaust window (13), and the homogenizing groove is in a tapered and closed conical head shape at one end far away from the vacuum exhaust window (13).
10. A process for producing stone paper by using the extruder as claimed in any one of claims 5 to 9, wherein the process comprises the following steps:
a, weighing raw materials: 74-77% of heavy calcium carbonate, 20-23% of polyethylene, 1-2% of zinc stearate and 1-2% of magnesium stearate;
B. b, feeding the raw materials obtained in the step A into an internal mixer to obtain raw material particles for papermaking;
C. and C, connecting the extrusion end of the extruder with an O-shaped die head through a connecting pipe, feeding the raw material particles obtained in the step B into the extruder, mixing, melting, extruding and blow-molding the raw materials to obtain the calcium carbonate environment-friendly paper film, wherein the process parameters of the extruder are as follows: the length-diameter ratio of the screw is 36:1, the temperatures of the feeding section (2), the melting section (3) and the homogenizing section (4) are 155-160 ℃, the temperature of the quantifying section (5) is 155 ℃, the temperatures of the blocking section (6), the negative pressure exhaust section (7), the compression section (8) and the pressure stabilizing section (9) are 160-165 ℃, the temperature of the connecting pipe is 165 ℃, the temperature of the O-shaped die head is 170 ℃, the rotation speed of the screw is 50-55 rpm, and the pressure of the O-shaped die head is 35-45 MPa.
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| CN202010064107.8A CN111152436A (en) | 2020-01-20 | 2020-01-20 | Environment-friendly stone paper extrusion molding screw, extruder and stone paper production process |
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| CN202010064107.8A CN111152436A (en) | 2020-01-20 | 2020-01-20 | Environment-friendly stone paper extrusion molding screw, extruder and stone paper production process |
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| CN115157626A (en) * | 2022-06-07 | 2022-10-11 | 安徽普瑞斯电工机械有限公司 | Special extrusion screw for low-smoke halogen-free flame-retardant cable material |
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