CN107034685B - Polyurethane waterproof leather production line - Google Patents
Polyurethane waterproof leather production line Download PDFInfo
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- CN107034685B CN107034685B CN201710205367.0A CN201710205367A CN107034685B CN 107034685 B CN107034685 B CN 107034685B CN 201710205367 A CN201710205367 A CN 201710205367A CN 107034685 B CN107034685 B CN 107034685B
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- 239000004814 polyurethane Substances 0.000 title claims abstract description 51
- 229920002635 polyurethane Polymers 0.000 title claims abstract description 51
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 21
- 239000010985 leather Substances 0.000 title claims abstract description 20
- 238000000576 coating method Methods 0.000 claims abstract description 105
- 239000011248 coating agent Substances 0.000 claims abstract description 103
- 239000004744 fabric Substances 0.000 claims abstract description 60
- 239000002002 slurry Substances 0.000 claims abstract description 22
- 239000000463 material Substances 0.000 claims description 61
- 238000001035 drying Methods 0.000 claims description 28
- 230000007246 mechanism Effects 0.000 claims description 15
- 239000002649 leather substitute Substances 0.000 abstract description 14
- 238000007790 scraping Methods 0.000 description 33
- 239000000203 mixture Substances 0.000 description 21
- 238000002360 preparation method Methods 0.000 description 16
- 238000000034 method Methods 0.000 description 14
- 239000000126 substance Substances 0.000 description 10
- 230000008569 process Effects 0.000 description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 6
- 238000005299 abrasion Methods 0.000 description 3
- 238000009835 boiling Methods 0.000 description 3
- 239000013043 chemical agent Substances 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 230000014759 maintenance of location Effects 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 2
- FJQXCDYVZAHXNS-UHFFFAOYSA-N methadone hydrochloride Chemical compound Cl.C=1C=CC=CC=1C(CC(C)N(C)C)(C(=O)CC)C1=CC=CC=C1 FJQXCDYVZAHXNS-UHFFFAOYSA-N 0.000 description 2
- 230000009965 odorless effect Effects 0.000 description 2
- 239000002987 primer (paints) Substances 0.000 description 2
- 238000007581 slurry coating method Methods 0.000 description 2
- 238000007664 blowing Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- ZTXONRUJVYXVTJ-UHFFFAOYSA-N chromium copper Chemical compound [Cr][Cu][Cr] ZTXONRUJVYXVTJ-UHFFFAOYSA-N 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000855 fermentation Methods 0.000 description 1
- 230000004151 fermentation Effects 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 150000004702 methyl esters Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Images
Classifications
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
- D06N3/0086—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the application technique
- D06N3/0095—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the application technique by inversion technique; by transfer processes
- D06N3/0097—Release surface, e.g. separation sheets; Silicone papers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
- B05C11/02—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface
- B05C11/04—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface with blades
- B05C11/041—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface with blades characterised by means for positioning, loading, or deforming the blades
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C13/00—Means for manipulating or holding work, e.g. for separate articles
- B05C13/02—Means for manipulating or holding work, e.g. for separate articles for particular articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C9/00—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important
- B05C9/06—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying two different liquids or other fluent materials, or the same liquid or other fluent material twice, to the same side of the work
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/04—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases
- B05D3/0406—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases the gas being air
- B05D3/0413—Heating with air
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
- D06N3/007—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by mechanical or physical treatments
- D06N3/0077—Embossing; Pressing of the surface; Tumbling and crumbling; Cracking; Cooling; Heating, e.g. mirror finish
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N2211/00—Specially adapted uses
- D06N2211/12—Decorative or sun protection articles
- D06N2211/28—Artificial leather
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Synthetic Leather, Interior Materials Or Flexible Sheet Materials (AREA)
- Treatment And Processing Of Natural Fur Or Leather (AREA)
Abstract
The invention provides a polyurethane waterproof leather production line which comprises a coating machine, an oven and a conveyor belt, wherein the coating machine is used for coating polyurethane fabric slurry on release paper, the conveyor belt is used for conveying cloth between the coating machine and the oven, the oven comprises a fan, the oven is used for supplying air to an internal space, the fan and the conveyor belt are also connected with a control unit, the control unit is used for controlling the conveyor belt to stay in the oven for no more than 15 minutes at one time, controlling the fan to supply air in the oven for no more than 10 square/minute during the period, then controlling the conveyor belt to stay in the oven for no less than 15 minutes, and controlling the air supply amount of the fan to be no less than 18 square/minute during the period. The problem of pinhole appears in the synthetic leather among the prior art, promote waterproof leather's waterproof degree is solved.
Description
Technical Field
The invention relates to the field of synthetic leather processing and preparation, in particular to a novel polyurethane waterproof leather production line.
Background
Synthetic leather is a substitute material of leather, along with the improvement of living standard of people, people pursue high-quality daily products gradually, the demand of leather products is more and more, along with the enhancement of animal protection consciousness, animal genuine leather can not satisfy people's demand, synthetic leather products become the development trend of future gradually, synthetic leather is applied to raincoat waterproof leather and makes, because the not enough meticulous problem that has the pinhole easily that has led to of manufacturing process, its wear-resisting degree also hardly satisfies the demand in market.
Disclosure of Invention
The invention aims to solve the technical problem of providing a novel polyurethane waterproof leather production line, and solves the problems that synthetic leather in the prior art has pinholes and the waterproof degree of the waterproof leather is improved.
The invention is realized by the following steps: the polyurethane waterproof leather production line comprises a coating machine, an oven and a conveyor belt, wherein the coating machine is used for coating polyurethane fabric slurry on release paper, the conveyor belt is used for conveying cloth between the coating machine and the oven, the oven comprises a fan, the oven is used for supplying air to the inner space, the fan and the conveyor belt are also connected with a control unit, the control unit is used for controlling the conveyor belt to stay in the oven for no more than 15 minutes at one time, controlling the fan to supply air in the oven for no more than 10 square/minute during the period, then controlling the conveyor belt to stay in the oven for no less than 15 minutes, and controlling the air supply quantity of the fan to be no less than 18 square/minute during the period.
Further, the control unit is also used for controlling the conveyor belt to stay in the oven for not more than 10 minutes at a time, controlling the fan to blow air in the oven for not more than 10 square/minute during the stay, then controlling the conveyor belt to stay in the oven for not less than 10 minutes, and controlling the air blowing amount of the fan to be not less than 18 square/minute during the stay.
Preferably, the thickness of the scraper of the coating machine is adjusted through a height adjusting mechanism, the height adjusting mechanism comprises a gear rack mechanism, a pulley track mechanism or a nut and bolt mechanism, and the thickness of the scraper can be adjusted between 3mm and 12 mm.
The coating machine comprises a primary material coating machine, a middle material coating machine, a second middle material coating machine and a bottom material coating machine which are arranged along the direction of a conveying belt, wherein preposed drying ovens are respectively arranged among the primary material coating machine, the middle material coating machine, the second middle material coating machine and the bottom material coating machine, each preposed drying oven comprises a preposed fan, a control unit is further connected with the preposed fan, the control unit is further used for controlling the conveying belt to stay in the preposed drying oven for no more than 10 minutes at one time, controlling the preposed fan to supply air in the preposed drying oven for no more than 10 square/minute during the period, then controlling the conveying belt to stay in the preposed drying oven for no less than 10 minutes again, and controlling the air supply amount of the preposed fan to be no less than 18 square/.
The invention has the following advantages: through dividing coating to scrape many times, increase the thickness of coating, can carry out the processing of defoaming better in the thinner coating at every turn simultaneously, prevent that waterproof leather from appearing the pinhole, promote raincoat leather's waterproof degree.
Drawings
FIG. 1 is a flow chart of a method of making according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a coater and an oven according to an embodiment of the present invention
FIG. 3 is a schematic diagram of a connection relationship of pipeline units according to an embodiment of the present invention;
FIG. 4 is a diagram illustrating a structure of a scraper of a coater according to an embodiment of the present invention;
FIG. 5 is a schematic view of a synthetic leather production line according to an embodiment of the present invention.
Description of reference numerals:
1. coating machine;
10. a scraper;
11. a primary material coating machine;
12. a medium material coating machine;
13. a second medium material coating machine;
14. a primer coating machine;
2. an oven;
21. a front oven is arranged;
21. a fan;
3. a conveyor belt;
4. a control unit;
5. and a frequency conversion unit.
Detailed Description
In order to explain technical contents, structural features, and objects and effects of the present invention in detail, the following detailed description is given with reference to the accompanying drawings in conjunction with the embodiments.
Referring to fig. 1, the preparation method of the polyurethane waterproof leather of the present invention includes step S108, after finishing coating the polyurethane fabric slurry on the release paper, attaching the base fabric, and performing variable-frequency drying in stages, specifically, staying in the oven for not more than 15 minutes, wherein the air output of the fan is not more than 10 square/minute; then staying for not less than 15 minutes, wherein the air output of the fan is not less than 18 square/minute; and cooling, peeling and rolling to obtain a finished product. Wherein the polyurethane fabric slurry comprises 860A: 100 g/m, DMF: 60 g/m, methyl ester: 20 g/m, toner: 6 grams per square meter, and 2 grams per square meter of the wear aid for the chromium copper complex. In a specific embodiment, the slurry can be placed in a ventilation position for standing for 24 hours after the configuration is completed, so that chemical components harmful to a human body can be volatilized, and sufficient fermentation time in the slurry can be ensured, so that the slurry is more viscous, and the generated synthetic leather is more flexible. The term "stay" means the time of any mass point on the synthetic leather in the oven, and can be the time of the whole piece of cloth being sent into the oven and then taken out, or the time of the cloth in any position on the production line from the oven to the oven. The air volume is the air volume evenly spread out on each square meter of cloth, and the oven in the standing process is also at different temperatures along with the change of the air volume. In the process of drying the slurry, due to different boiling points of various chemical preparations in the slurry, in the process of heating and drying, if the air volume is too large, the temperature rises too fast, the boiling of the chemical preparations can be caused, so that air bubbles can be rapidly generated, the air bubbles can leave pinholes which can not be detected by naked eyes, once the pinholes are under strong pressure, the pinholes can become water seepage valves, and the product is unqualified. Therefore, in our embodiment, through the steps, the air is kept in the oven for no less than 15 minutes, and the air volume of the fan is not more than 10 square/minute; after cooling, peeling and rolling are carried out to obtain a finished product, the temperature in the oven is controlled to be 70 +/-7 ℃, most of the preparation does not boil, but the chemical preparation in the oven can be effectively removed due to the fact that the high temperature is in a state of accelerated volatilization, the chemical preparation stays for not less than 15 minutes at the later stage, the temperature in the oven is controlled to be 100 +/-10 ℃ in the process that the air supply quantity of a fan is not less than 18 square/minute, the problem of pinholes cannot be caused after the chemical preparation in the cloth is volatilized too much, the synthetic leather dried by the step is more compact and wear-resistant, and the water pressure resistance value is greatly improved and can reach more than 1 ten thousand mm. Meanwhile, the wear resistance is greatly improved, 5 thousand-turn breakage by a Martindale method is achieved, and the water pressure resistance is also 5 thousand mm of allowance. Finally, because the chemical agent is removed in two steps, the environmental protection performance of the product is also improved, and the product is odorless and highly environment-friendly.
In other further embodiments, the method further comprises the step of scraping the polyurethane fabric slurry for multiple times, wherein the following steps are carried out during the multiple scraping processes:
the mixture stays in the oven for no more than 10 minutes, and the air output of the fan is no more than 10 square/minute; and the rest time is not less than 10 minutes, and the air output of the fan is not less than 18 square/minute. The thickness of the slurry for coating and scraping the polyurethane fabric is not too high and is limited by the reason of the pinholes, and the inventor finds in production practice that increasing the thickness of the slurry coating affects the emptying speed of bubbles in the manufacturing process, so that chemical agent residues are caused, the temperature is easily increased unevenly, foaming is still caused in the manufacturing process, and the finished fabric is not dense enough, and water leakage and abrasion resistance are caused accordingly. Explaining that coating thickness and water repellency are a contradictory combination, in solving the present problem, our inventors have also found that, although an increase in thickness per pass does not necessarily result in an increase in abrasion resistance, an increase in the number of passes after appropriate treatment has a positive effect on the increase in abrasion resistance. Therefore, in the embodiment, the slurry with the rated thickness is divided into multiple coating steps, the step of staying in the oven is not more than 10 minutes between each coating step, and the air output of the fan is not more than 10 square/minute; and the rest time is not less than 10 minutes, and the air output of the fan is not less than 18 square/minute. The temperature in the oven is controlled to be not less than 10 minutes in the early stage, the air output of a fan is not more than 10 square/minute, the temperature in the oven is controlled to be 60 (+ -6) degrees centigrade approximately, most of the preparation does not boil at this time, but the chemical preparation in the oven can be removed more effectively due to the fact that the high temperature is in the state of accelerated volatilization, the temperature in the oven is controlled to be 80 (+ -8) degrees centigrade approximately in the later stage, the air output of the fan is not less than 18 square/minute, compact synthetic leather can be formed on each coating, pinholes are avoided, and wear resistance can be achieved. The 10 minute retention is set because the slurry scraped at the first stage will be dried for a longer time, if the drying time is set too long, the finished product becomes brittle and hard at the later stage, and cannot reach the index, and the retention time can be increased partially according to the requirement in the retention time after the middle material scraping and the middle material secondary scraping. By the method, the thickness of the waterproof leather can be further increased, and the compactness of the waterproof leather can be still ensured under the condition of increasing the thickness of a finished product.
In a further preferred embodiment, the method of the invention adopts the step of scraping the polyurethane fabric slurry by 4 times, and specifically comprises the steps of primary polyurethane fabric scraping, secondary polyurethane fabric middle material scraping and polyurethane fabric bottom material scraping.
In a particular embodiment there is also included the step of,
s101, performing primary coating and scraping on the polyurethane fabric by using a scraper with the thickness of 5-8 mm;
s103, coating and scraping the polyurethane fabric middle material by using a scraper with the thickness of 8-12 mm;
s105, performing secondary coating and scraping on the polyurethane fabric medium material by using a scraper with the thickness of 6-10 mm;
s107, coating and scraping the bottom material of the polyurethane fabric by using a scraper with the thickness of 3-5 mm.
In a specific embodiment, the distance between the primary material coating middle scraper and the surface of the cloth is 5mm-8mm, the distance between the intermediate material coating middle scraper and the surface of the cloth is 8mm-12mm, the distance between the intermediate material coating middle scraper and the surface of the cloth is 6mm-10mm, the distance between the primary material coating middle scraper and the surface of the cloth is 3mm-5mm, and the size of about 30mm is refined into size below 12mm for 4 times. The coating with the thickness larger than 12mm is difficult to overcome the pinhole problem caused by uneven gas boiling, the optimal thickness is about 10mm, the coating thickness of the medium material is relatively thick, and the thickness and the wear-resistant index of a finished product can be ensured to the maximum extent.
The specific process of the present invention will be illustrated below with some specific examples:
example 1
Coating polyurethane fabric slurry on release paper;
carrying out primary coating and scraping on the polyurethane fabric by using a scraper with the thickness of 5 mm;
sending the mixture into an oven and staying for 10 minutes, wherein the air output of a fan is 8 square/minute; and staying for 10 minutes, wherein the air output of the fan is 19 square/minute.
Coating and scraping the polyurethane fabric middle material by using a scraper with the thickness of 8 mm;
sending the mixture into a drying oven for staying for 9 minutes, wherein the air output of a fan is 10 square/minute; staying for 13 minutes, wherein the air output of the fan is 20 square/minute;
carrying out secondary coating and scraping on the polyurethane fabric medium material by using a scraper with the thickness of 6 mm;
sending the mixture into an oven for staying for 8 minutes, wherein the air output of a fan is 9 square/minute; staying for 15 minutes, wherein the air output of the fan is 18 square/minute;
coating and scraping the bottom material of the polyurethane fabric by using a scraper with the thickness of 5 mm;
sending the mixture into an oven for staying for 15 minutes, wherein the air output of a fan is 6 square/minute; and staying for 20 minutes, wherein the air output of the fan is 24 square/minute.
Example 2
Coating polyurethane fabric slurry on release paper;
carrying out primary coating and scraping on the polyurethane fabric by using a scraper with the thickness of 8 mm;
sending the mixture into an oven for staying for no more than 7 minutes, wherein the air output of a fan is 10 square/minute; and staying for another 15 minutes, wherein the air volume of the fan is 18 square/minute.
Coating and scraping the polyurethane fabric middle material by using a scraper with the thickness of 12 mm;
sending the mixture into a drying oven for staying for 6 minutes, wherein the air output of a fan is 9 square/minute; staying for 11 minutes, wherein the air output of the fan is 26 square/minute;
a scraper with the thickness of 10mm is used for secondary coating and scraping of the polyurethane fabric;
sending the mixture into an oven for staying for 10 minutes, wherein the air output of a fan is 8 square/minute; staying for 12 minutes, wherein the air output of the fan is 22 square/minute;
coating and scraping the bottom material of the polyurethane fabric by using a scraper with the thickness of 4 mm;
sending the mixture into an oven for staying for 14 minutes, wherein the air output of a fan is 8 square/minute; and staying for another 19 minutes, wherein the air output of the fan is 19 square/minute.
Example 3
Coating polyurethane fabric slurry on release paper;
carrying out primary coating and scraping on the polyurethane fabric by using a scraper with the thickness of 6 mm;
sending the mixture into a drying oven to stay for 8.5 minutes, wherein the air output of a fan is 9.5 square/minute; the mixture is kept for 12 minutes, and the air volume of the fan is 18.5 square/minute.
Coating and scraping the polyurethane fabric middle material by using a scraper with the thickness of 10 mm;
sending the mixture into a drying oven for staying for 7.5 minutes, wherein the air output of a fan is 7.5 square/minute; staying for 13 minutes again, wherein the air output of the fan is 22 square/minute;
carrying out secondary coating and scraping on the polyurethane fabric medium material by using a scraper with the thickness of 8 mm;
sending the mixture into a drying oven for staying for 9.5 minutes, wherein the air output of a fan is 8.5 square/minute; staying for 17 minutes, wherein the air output of the fan is 22.5 square/minute;
coating and scraping the bottom material of the polyurethane fabric by using a scraper with the thickness of 3 mm;
sending the mixture into an oven for 10 minutes, wherein the air output of a fan is 10 square/minute; the mixture is kept for 15 minutes, and the air volume of the fan is 26 square/minute.
Example 4
Coating polyurethane fabric slurry on release paper;
carrying out primary coating and scraping on the polyurethane fabric by using a scraper with the thickness of 6.5 mm;
sending the mixture into a drying oven for staying for 9.4 minutes, wherein the air output of a fan is 8.7 square/minute; and the mixture is kept for 12.3 minutes, and the air output of a fan is 21 square/minute.
Coating and scraping the polyurethane fabric middle material by using a scraper with the thickness of 10 mm;
sending the mixture into a drying oven for staying for 7.2 minutes, wherein the air output of a fan is 7.2 square/minute; then staying for 14.8 minutes, wherein the air output of the fan is 22.1 square/minute;
carrying out secondary coating and scraping on the polyurethane fabric medium material by using a scraper with the thickness of 8 mm;
sending the mixture into a drying oven for staying for 6.4 minutes, wherein the air output of a fan is 9.8 square/minute; then staying for 10.5 minutes, wherein the air output of the fan is 23.7 square/minute;
coating and scraping the bottom material of the polyurethane fabric by using a scraper with the thickness of 4.5 mm;
sending the mixture into a drying oven for staying for 13.7 minutes, wherein the air output of a fan is 8.8 square/minute; and the mixture stays for 17.8 minutes, and the air volume of the fan is 18 square/minute.
In the embodiment shown in fig. 2, a polyurethane waterproof leather production line for carrying out the preparation method is also disclosed, which comprises a coating machine 1, an oven 2 and a conveyor belt 3, the coating machine is used for coating polyurethane fabric slurry on release paper, the conveyor belt is used for conveying cloth between the coating machine and the drying oven, the drying oven comprises a fan 21, the drying oven is used for supplying air to the inner space, in the connection relation shown in fig. 3, the fan 21 and the conveyor 3 are also connected to the control unit 4, the control unit is used for controlling the conveyor belt 3 to move forward, so that the conveyor belt drives the cloth to stay in the oven for no more than 15 minutes at one time, and the fan is controlled to blow air in the oven for no more than 10 square/minute in the period, then the conveyor belt is controlled to stay in the oven for not less than 15 minutes, and the air output of the fan is controlled to be not less than 18 square/minute. The control unit 4 can be the processing chip commonly used, generally set up in intelligent terminal such as cell-phone, electronic computer etc., can be through artificial operation intelligent terminal, the control unit receives user's instruction, also can guarantee the control to conveyer belt dwell time through establishing clock module and pre-programming in, fan 21 can be inside to set up a frequency conversion unit 5 again, frequency conversion unit 5 is connected with the energy supply device of fan, frequency conversion unit 5 and control unit 4 communication connection, frequency conversion unit is through receiving control unit's signal, the size of the output power adjustment amount of wind of fan can be controlled, also can be through the heating power of the interior heating wire of control fan, the temperature in the adjustment oven. In other embodiments, a temperature sensor may be disposed in the oven and connected to the control unit, so as to adjust the operating condition of the frequency conversion unit according to the temperature information fed back. Therefore, in our example, with the above apparatus, the cloth stays in the oven for no less than 15 minutes, during which the fan air volume is no more than 10 square/minute; after cooling, peeling and rolling are carried out to obtain a finished product, the temperature in the oven is controlled to be 70 +/-7 ℃, most of the preparation does not boil, but the chemical preparation in the oven can be effectively removed due to the fact that the high temperature is in a state of accelerated volatilization, the chemical preparation stays for not less than 15 minutes at the later stage, the temperature in the oven is controlled to be 100 +/-10 ℃ in the process that the air supply quantity of a fan is not less than 18 square/minute, the problem of pinholes cannot be caused after the chemical preparation in the cloth is volatilized too much, the synthetic leather dried by the step is more compact and wear-resistant, and the water pressure resistance value is greatly improved and can reach more than 1 ten thousand mm. Meanwhile, the wear resistance is greatly improved, 5 thousand-turn breakage by a Martindale method is achieved, and the water pressure resistance is also 5 thousand mm of allowance. Finally, because the chemical agent is removed in two steps, the environmental protection performance of the product is also improved, and the product is odorless and highly environment-friendly.
In some alternative embodiments, as shown in fig. 2, the production line includes only one set of the coating machine 1 and the oven 2, on which the cloth can be coated with different levels of slurry, and the oven must meet the requirement of the drying procedure in several coating processes, so in a specific embodiment, the control unit 4 is further configured to control the conveyor belt to stay in the oven for no more than 10 minutes at a time, control the fan to blow air into the oven for no more than 10 square/minute during the time, control the conveyor belt to stay in the oven for no less than 10 minutes again, and control the fan to blow air for no less than 18 square/minute during the time. Through providing different stoving modes, the production line can accomplish the stoving operation of different demands.
In a preferred embodiment, the coating machine of the production line also needs to meet different requirements of multiple coatings, so that the thickness of the scraper of the coating machine is adjustable, as shown in fig. 4, the thickness of the scraper 10 of the coating machine is adjusted through a height adjusting mechanism, the height adjusting mechanism comprises a gear rack mechanism, a pulley track mechanism or a nut and bolt mechanism, and the thickness of the scraper can be adjusted between 3mm and 12 mm. The height adjusting mechanism is further connected with the control unit, and the control unit can actively adjust the thickness of the scraper according to needs. Through the arrangement, the processes of primary coating and scraping, medium coating and scraping and primer coating and scraping of the polyurethane fabric can be completed through one coating machine. Aiming at the drying time of the oven, the control unit can receive the operation information of a user, so that the oven is switched in a working mode of a plurality of residence times and the air supply volume of the fan, and the production steps of the polyurethane synthetic leather are better executed.
In other specific embodiments shown in fig. 5, the coating machines include a primary material coating machine, a secondary middle material coating machine, and a backing material coating machine, which are arranged along the direction of the conveyor belt, and pre-ovens are respectively arranged among the primary material coating machine, the secondary middle material coating machine, and the backing material coating machine, so as to form a production line of the primary material coating machine 11, the pre-oven 21, the middle material coating machine 12, the pre-oven 21, the secondary middle material coating machine 13, the pre-oven 21, the backing material coating machine 14, and the oven 2. The control unit is also used for controlling the conveyor belt to stay in the preposed oven for not more than 10 minutes at one time, controlling the preposed fan to supply air into the preposed oven for not more than 10 square/minute during the stay, then controlling the conveyor belt to stay in the preposed oven for not less than 10 minutes again, and controlling the air supply quantity of the preposed fan to be not less than 18 square/minute during the stay. Through the design, the control unit can control the front-mounted oven and the oven to provide different drying modes, the flow requirement of the preparation of the polyurethane waterproof leather is met, the scraper thickness of the coating machine can be controlled by the control unit, and the thickness requirement of the polyurethane synthetic leather slurry coating and scraping in different stages is met.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (2)
1. The polyurethane waterproof leather production line is characterized by comprising a coating machine, an oven and a conveyor belt, wherein the coating machine is used for coating polyurethane fabric slurry on release paper, the conveyor belt is used for conveying cloth between the coating machine and the oven, the coating machine comprises a primary material coating machine, a middle material coating machine, a second middle material coating machine and a bottom material coating machine which are arranged along the direction of the conveyor belt, front-mounted ovens are respectively arranged among the primary material coating machine, the middle material coating machine, the second middle material coating machine and the bottom material coating machine, an oven is arranged behind the bottom material coating machine, and the primary material, the middle material and the bottom material are polyurethane fabric slurry with the same component; the drying oven comprises a fan, the drying oven is used for supplying air to the inner space, the fan and the conveyor belt are also connected with a control unit, the control unit is used for controlling the conveyor belt to stay in the drying oven for no more than 15 minutes at one time, and controlling the fan to supply air to the drying oven for no more than 10 square/minute and controlling the temperature to be 70 +/-7 ℃; then the conveyor belt is controlled to stay in the oven for not less than 15 minutes, the air output of the fan is controlled to be not less than 18 square/minute, and the temperature is controlled to be 100 +/-10 ℃; the control unit is also used for controlling the conveyor belt to stay in the front-mounted oven for no more than 10 minutes at one time, controlling the front-mounted fan to supply air into the front-mounted oven for no more than 10 square/minute and controlling the temperature to be 60 +/-6 ℃; then the conveyor belt is controlled to stay in the preposed oven for not less than 10 minutes, the air output of a preposed fan is controlled to be not less than 18 square/minute, and the temperature is controlled to be 80 +/-8 ℃;
the control unit is used for controlling the thickness of a scraper of the coating machine, the distance between the scraper of the primary material coating machine and the surface of the cloth is 5-8mm, the distance between the scraper of the middle material coating machine and the surface of the cloth is 8-12mm, the distance between the scraper of the second middle material coating machine and the surface of the cloth is 6-10mm, and the distance between the scraper of the bottom material coating machine and the surface of the cloth is 3-5 mm.
2. The polyurethane leatheroid production line of claim 1, wherein the thickness of the scraper of the coater is adjusted by a height adjustment mechanism comprising a rack and pinion mechanism, a pulley track mechanism or a nut and bolt mechanism, and the thickness of the scraper is adjustable between 3mm and 12 mm.
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| CN107876322B (en) * | 2017-12-22 | 2023-06-13 | 奥音新材料（镇江）有限公司 | Brushing mechanism for coating device of automatic flexible production line of receiver |
| CN109137551A (en) * | 2018-09-21 | 2019-01-04 | 浙江禾欣新材料有限公司 | A kind of high antifungal gene polyurethane leather of two-sided foaming |
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