CN111844813A - Membrane preforming process - Google Patents
Membrane preforming process Download PDFInfo
- Publication number
- CN111844813A CN111844813A CN202010762422.8A CN202010762422A CN111844813A CN 111844813 A CN111844813 A CN 111844813A CN 202010762422 A CN202010762422 A CN 202010762422A CN 111844813 A CN111844813 A CN 111844813A
- Authority
- CN
- China
- Prior art keywords
- base cloth
- cloth
- rubber
- pressing
- diaphragm
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 30
- 239000012528 membrane Substances 0.000 title abstract description 42
- 239000004744 fabric Substances 0.000 claims abstract description 105
- 229920001971 elastomer Polymers 0.000 claims abstract description 59
- 238000003825 pressing Methods 0.000 claims abstract description 24
- 239000002994 raw material Substances 0.000 claims abstract description 17
- 229920000297 Rayon Polymers 0.000 claims abstract description 14
- 238000005520 cutting process Methods 0.000 claims abstract description 4
- 238000001816 cooling Methods 0.000 claims description 9
- 239000003292 glue Substances 0.000 claims description 2
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 8
- 230000009286 beneficial effect Effects 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 4
- 229920001973 fluoroelastomer Polymers 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 230000035945 sensitivity Effects 0.000 description 4
- 238000007493 shaping process Methods 0.000 description 4
- 238000000748 compression moulding Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 238000007598 dipping method Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 229920000459 Nitrile rubber Polymers 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- NTXGQCSETZTARF-UHFFFAOYSA-N buta-1,3-diene;prop-2-enenitrile Chemical compound C=CC=C.C=CC#N NTXGQCSETZTARF-UHFFFAOYSA-N 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010068 moulding (rubber) Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
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
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/40—Shaping or impregnating by compression not applied
- B29C70/42—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles
- B29C70/46—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using matched moulds, e.g. for deforming sheet moulding compounds [SMC] or prepregs
-
- 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
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/06—Fibrous reinforcements only
- B29C70/10—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres
- B29C70/16—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres using fibres of substantial or continuous length
- B29C70/22—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres using fibres of substantial or continuous length oriented in at least two directions forming a two dimensional structure
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2007/00—Flat articles, e.g. films or sheets
- B29L2007/002—Panels; Plates; Sheets
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Mechanical Engineering (AREA)
- Textile Engineering (AREA)
- Diaphragms And Bellows (AREA)
Abstract
The invention relates to the field of membrane forming, in particular to a membrane preforming process. The method comprises the following steps: step 1: immersing the base cloth into the viscose for 3-5 min until the viscose is attached to the surface of the base cloth to form the dipped base cloth; step 2: baking the viscose on the base cloth at the temperature of 80-100 ℃, pressing the dipped base cloth into the shape same as that of the diaphragm, and cutting the formed base cloth into the size required by the diaphragm to obtain the formed base cloth; and step 3: pressing the molten rubber raw material to form two rubber sheets; and 4, step 4: and (3) respectively placing the two base fabrics on two sides of the formed base fabric in the step (2), and then pressing and forming. According to the membrane preforming process, the base cloth is preformed before the membrane is formed, so that the base cloth in the membrane is prevented from being folded, and the service life of the membrane is prolonged.
Description
Technical Field
The invention relates to the field of membrane forming, in particular to a membrane preforming process.
Background
The cloth-clamping rubber diaphragm is a diaphragm internally provided with base cloth, the base cloth can increase the tensile resistance of the diaphragm, so that the diaphragm can bear larger acting force, meanwhile, the service life of the diaphragm is prolonged, and the cloth-clamping rubber diaphragm is mainly used in a pump under high-pressure operation. The cloth-sandwiched rubber diaphragm is formed by wrapping base cloth in a molten rubber raw material and then pressing the base cloth by using a mold, but because the temperature of the molten rubber raw material is higher, the shrinkage of the rubber is greater than that of the base cloth in the cooling process after pressing, so that the base cloth is wrinkled. But the diaphragm can take place bending deformation in the use, and the deflection of rubber and base cloth is different this moment, can lead to the contact site of rubber and base cloth to take place to pull and lead to the final damage, and the base cloth can't increase the stretching resistance of diaphragm again for rubber can damage rapidly under the pulling force effect, makes the life of diaphragm reduce at last.
Disclosure of Invention
The invention aims to provide a process for preforming base cloth before membrane forming so as to prevent the base cloth in the membrane from wrinkling and prolong the service life of the membrane.
In order to achieve the purpose, the invention adopts the following technical scheme: a film preforming process comprising the steps of:
step 1: immersing the base cloth into the viscose for 3-5 min until the viscose is attached to the surface of the base cloth to form the dipped base cloth;
step 2: baking the viscose on the base cloth at the temperature of 80-100 ℃, pressing the dipped base cloth into the shape same as that of the diaphragm, and cutting the formed base cloth into the size required by the diaphragm to obtain the formed base cloth;
and step 3: pressing the molten rubber raw material to form two rubber sheets;
and 4, step 4: and (3) respectively placing the two base fabrics on two sides of the formed base fabric in the step (2), and then pressing and forming.
The beneficial effect of this scheme does:
1. the base cloth in the scheme can not be directly contacted with molten rubber, so that the base cloth is prevented from being wrinkled due to overlarge shrinkage during rubber molding, and the service life of the membrane sheet obtained by the step 4 through compression molding is longer.
2. During traditional diaphragm shaping, the rubber raw materials of melt state is direct and the base cloth contact, and in the diaphragm forming process, the rubber of both sides all receives pressure about base cloth and the base cloth, and the thickness direction skew of rubber is easily followed to the base cloth under the effect of pressure, leads to the thickness difference of the rubber of base cloth both sides, and the less one side of thickness takes place to break easily in the use to lead to the unable continuation of use of diaphragm. Step 3 of this scheme is earlier with the sheet rubber compression molding, and when step 4 carried out the compression molding to overlapped sheet rubber and base cloth, because the sheet rubber has already been the shaping this moment, so the thickness of sheet rubber can not continue to reduce again under the pressure effect to guarantee that the base cloth is located the middle part of diaphragm, when guaranteeing that the thickness of sheet rubber is less, also avoid the thickness of sheet rubber further to reduce when the diaphragm shaping, lead to the diaphragm to damage easily, so can further improve the life of diaphragm.
Further, after the rubber sheet in the step 3 is molded, the operation of the step 4 is performed after the rubber sheet is cooled to 30-40 ℃.
The beneficial effect of this scheme does: the temperature after the sheet rubber cooling is relatively lower, is difficult for scalding the workman, also avoids step 4 in addition, and after sheet rubber and base cloth press forming, the sheet rubber still reduced greatly because of the temperature and leads to the shrinkage too big, still makes the fold appear on the base cloth.
Further, pressing the rubber raw material into a rubber sheet with the thickness of 0.05-0.17 mm in step 3.
The beneficial effect of this scheme does: the thickness of the rubber sheet is small, the thickness of the finally formed membrane is small, and the membrane can be bent better when in use, so that the working efficiency of the pump is improved.
Further, after the rubber sheet is molded in the step 3, the rubber sheet is air-cooled.
The beneficial effect of this scheme does: the cooling speed of the rubber sheet can be accelerated by air cooling, and the production efficiency is improved.
Further, the pressing time of the rubber raw material in the step 3 is 5-8 s.
The beneficial effect of this scheme does: after the rubber raw material is pressed for 5-8 s, the rubber raw material is basically molded, and the molded rubber sheet can be taken out in time at the moment, so that the processing efficiency can be effectively improved.
Further, after the impregnated base cloth is pressed in the step 2, whether the shape of the base cloth is completely the same as that of the diaphragm or not is checked, if the shape of the base cloth is not the same as that of the diaphragm, local pressure is applied to positions with different shapes until the shape of the formed base cloth is the same as that of the diaphragm.
The beneficial effect of this scheme does: according to the scheme, the inspection of the pressed base cloth can reduce the reject ratio of the base cloth, and the unqualified base cloth is prevented from being used for manufacturing the cloth clamping diaphragm in the step 4, so that unqualified products appear in the cloth clamping diaphragm.
Further, after the glue on the base cloth in the step 2 is baked, repeating the operation of the step 1 again to obtain a secondary impregnated base cloth, and pressing the secondary impregnated base cloth after being dried.
The beneficial effect of this scheme does: when the sheet rubber was the fluororubber material, the shaping base cloth that this scheme made can be better with the sheet rubber laminating, and pressed into and pressed the double-layered cloth diaphragm, the life of double-layered cloth diaphragm is longer.
Detailed Description
The following is further detailed by way of specific embodiments:
examples 1 to 4, a film preforming process, which is to manufacture a cloth sandwiched film by the following steps, except that the baking temperature, the pressing temperature and the cooling temperature in the step 3 are different in the examples 1 to 3, as shown in the following table:
the manufacturing method of embodiments 1 to 4 includes the steps of:
step 1: immersing the base cloth into the viscose for 3-5 min until the viscose is attached to the surface of the base cloth to form the dipped base cloth, wherein the base cloth adopted in the step is the same as that in the prior art, and the step is not repeated;
step 2: baking the viscose on the base cloth at the temperature of 80-100 ℃, pressing the dipped base cloth into the shape same as that of the diaphragm, checking whether the shape of the base cloth is completely the same as that of the diaphragm, if not, locally pressing at different positions of the shape until the shape of the formed base cloth is the same as that of the diaphragm, and finally cutting the formed base cloth into the size required by the diaphragm to obtain the formed base cloth;
and step 3: pressing the molten nitrile rubber raw material at the temperature of 20-150 ℃ for 5-8 s until the rubber raw material forms two rubber sheets with the thickness of 0.05-0.17 mm, and air-cooling the rubber sheets until the rubber sheets are cooled to 30-40 ℃;
and 4, step 4: and (3) respectively placing the two base fabrics on two sides of the formed base fabric in the step (2), and pressing the two rubber sheets and the base fabric to form a cloth clamping membrane.
Embodiments 5 to 6 are based on the operation steps of embodiments 1 to 4, and after the step 2 dries the viscose on the base fabric, the operation of the step 1 is repeated again to obtain a secondary gum dipping base fabric, and after the viscose on the secondary gum dipping base fabric is dried, the secondary gum dipping base fabric is pressed into the same shape as the diaphragm.
The rubber raw material in the step 3 is fluororubber.
Otherwise, the other operation steps in this embodiment are the same as those in embodiments 1 to 4.
Specifically, the baking temperatures in step 3 of example 5 and example 6 differ from the pressing temperature and the cooling temperature as shown in the following table:
comparative experiment 1 and comparative experiment 2 were additionally designed:
first, comparative experiment 1 the cloth-sandwiched membrane was manufactured by the method of example 1, and the thickness of the cloth-sandwiched membrane was made 0.38mm while ensuring the yield.
Design comparative example 1: the method is characterized in that the method comprises the steps of adopting butadiene-acrylonitrile rubber and base cloth which are made of the same material, adopting the traditional method that the base cloth is firstly coated in a rubber raw material in a molten state, then adopting a die to press and form to manufacture the common cloth-sandwiched membrane with the same diameter, and manufacturing the thickness of the common cloth-sandwiched membrane to be 1mm of the minimum value under the condition of ensuring the qualified rate.
The thickness and the service life of the manufactured cloth clamping membrane under the same pressure are detected, and the detection results are as follows:
meanwhile, the cloth sandwiched membranes in the embodiment 1 and the comparative example 1 are used as gas membranes, and other structures, models and the like of the experimental gas meters are the same, and then the sensitivity of the gas meters is detected, so that the sensitivity of the gas meters using the cloth sandwiched membranes in the embodiment 1 is higher.
According to the detection results and tests, the cloth clamping membrane with smaller thickness can be manufactured by the method, and the sensitivity of the cloth clamping membrane is higher. Although the thickness of the cloth-sandwiched membrane manufactured by the method of the invention is smaller, the service life of the cloth-sandwiched membrane manufactured by the embodiment 1 is longer and the safety factor is higher compared with the common cloth-sandwiched membrane in the comparative example 1.
Second, comparative experiment 2 a cloth-sandwiched diaphragm made of a fluororubber material was manufactured by the method of example 5.
Design comparative example 2: the fluororubber and the base cloth which are made of the same materials are adopted, the conventional method that the base cloth is firstly wrapped in the rubber raw material in a molten state is adopted, then the common cloth-sandwiched membrane which has the same diameter as that of the common cloth-sandwiched membrane in the embodiment 5 is manufactured by a die press forming method, and the distance between an upper die and a lower die of the die is controlled when the common cloth-sandwiched membrane is pressed and formed by the die, so that the thickness of the manufactured common cloth-sandwiched membrane is the same as that of the cloth-sandwiched membrane manufactured in the embodiment 5.
And finally, detecting the service life of the manufactured cloth clamping membrane under the same pressure, wherein the detection results are as follows:
the following tests and tests show that: the cloth-sandwiched membrane manufactured by the method has longer service life even under the condition that the thickness of the cloth-sandwiched membrane is the same.
In summary, the method of the invention can manufacture the cloth clamping membrane with smaller thickness, and the smaller the thickness of the cloth clamping membrane is, the higher the sensitivity is in use, and the smaller the error is. The cloth clamping membrane manufactured by the method has longer service life under the condition of smaller thickness, is less prone to fracture and has higher safety coefficient in use. Finally, the manufactured cloth clamping membrane has obviously longer service life under the condition of same thickness.
The foregoing is merely an example of the present invention and common general knowledge in the art of designing and/or characterizing particular aspects and/or features is not described in any greater detail herein. It should be noted that, for those skilled in the art, without departing from the technical solution of the present invention, several variations and modifications can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.
Claims (7)
1. A film preforming process is characterized in that: the method comprises the following steps:
step 1: immersing the base cloth into the viscose for 3-5 min until the viscose is attached to the surface of the base cloth to form the dipped base cloth;
step 2: baking the viscose on the base cloth at the temperature of 80-100 ℃, pressing the dipped base cloth into the shape same as that of the diaphragm, and cutting the formed base cloth into the size required by the diaphragm to obtain the formed base cloth;
and step 3: pressing the molten rubber raw material to form two rubber sheets;
and 4, step 4: and (3) respectively placing the two base fabrics on two sides of the formed base fabric in the step (2), and then pressing and forming.
2. A film preforming process according to claim 1, characterised in that: and (4) after the rubber sheet in the step (3) is molded, cooling the rubber sheet to 30-40 ℃, and then performing the operation in the step (4).
3. A film preforming process according to claim 2, characterised in that: and 3, pressing the rubber raw material into a rubber sheet with the thickness of 0.05-0.17 mm.
4. A film preforming process according to claim 2, characterised in that: and (3) after the rubber sheet is molded in the step (3), air cooling is carried out on the rubber sheet.
5. A film sheet preforming process according to claim 3 or 4, characterised in that: and 3, pressing the rubber raw material for 5-8 s.
6. A film preforming process according to claim 1, characterised in that: and 2, after the impregnated base cloth is pressed, checking whether the shape of the base cloth is completely the same as that of the diaphragm, if not, locally pressing at different positions of the shape until the shape of the formed base cloth is the same as that of the diaphragm.
7. A film preforming process according to claim 1, characterised in that: and (3) after the glue on the base cloth in the step (2) is baked, repeating the operation in the step (1) again to obtain secondary impregnated base cloth, and pressing the secondary impregnated base cloth after being dried in the air.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010762422.8A CN111844813A (en) | 2020-07-31 | 2020-07-31 | Membrane preforming process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010762422.8A CN111844813A (en) | 2020-07-31 | 2020-07-31 | Membrane preforming process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111844813A true CN111844813A (en) | 2020-10-30 |
Family
ID=72954080
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010762422.8A Pending CN111844813A (en) | 2020-07-31 | 2020-07-31 | Membrane preforming process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111844813A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4338370A (en) * | 1980-04-07 | 1982-07-06 | Goodyear Aerospace Corporation | Chemically resistant coated fabric |
| CN101205320A (en) * | 2007-12-03 | 2008-06-25 | 咸阳时代特种密封科技有限公司 | Fabrication process of air break valve rubber fabric film plate for railway freight car |
| CN101629385A (en) * | 2009-08-10 | 2010-01-20 | 成都铁路局成都工务机械段贵阳劳动服务公司 | Production method of nylon geotextile |
| CN102146981A (en) * | 2010-12-27 | 2011-08-10 | 王淑霞 | Method for producing triangular belt by adopting water emulsion slurry leaching cloth |
| CN202006532U (en) * | 2011-04-06 | 2011-10-12 | 杭州藤仓橡胶有限公司 | Mould for producing canvas filler rubber diaphragm |
| CN103770439A (en) * | 2013-12-27 | 2014-05-07 | 南京金三力橡塑有限公司 | Production method of ultrathin fluorinated silicone rubber cloth-sandwiched membrane |
| CN103878989A (en) * | 2014-02-27 | 2014-06-25 | 顾伟玲 | Manufacturing technique of airtight rubber cloth |
| CN110815991A (en) * | 2019-11-28 | 2020-02-21 | 徐州顺天工业用布有限公司 | Rubber industrial cloth and manufacturing method thereof |
-
2020
- 2020-07-31 CN CN202010762422.8A patent/CN111844813A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4338370A (en) * | 1980-04-07 | 1982-07-06 | Goodyear Aerospace Corporation | Chemically resistant coated fabric |
| CN101205320A (en) * | 2007-12-03 | 2008-06-25 | 咸阳时代特种密封科技有限公司 | Fabrication process of air break valve rubber fabric film plate for railway freight car |
| CN101629385A (en) * | 2009-08-10 | 2010-01-20 | 成都铁路局成都工务机械段贵阳劳动服务公司 | Production method of nylon geotextile |
| CN102146981A (en) * | 2010-12-27 | 2011-08-10 | 王淑霞 | Method for producing triangular belt by adopting water emulsion slurry leaching cloth |
| CN202006532U (en) * | 2011-04-06 | 2011-10-12 | 杭州藤仓橡胶有限公司 | Mould for producing canvas filler rubber diaphragm |
| CN103770439A (en) * | 2013-12-27 | 2014-05-07 | 南京金三力橡塑有限公司 | Production method of ultrathin fluorinated silicone rubber cloth-sandwiched membrane |
| CN103878989A (en) * | 2014-02-27 | 2014-06-25 | 顾伟玲 | Manufacturing technique of airtight rubber cloth |
| CN110815991A (en) * | 2019-11-28 | 2020-02-21 | 徐州顺天工业用布有限公司 | Rubber industrial cloth and manufacturing method thereof |
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Application publication date: 20201030 |
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