CN112519087A - Halogenated butyl rubber plug coated with Teflon film, profiling mold and production process - Google Patents
Halogenated butyl rubber plug coated with Teflon film, profiling mold and production process Download PDFInfo
- Publication number
- CN112519087A CN112519087A CN202011200778.9A CN202011200778A CN112519087A CN 112519087 A CN112519087 A CN 112519087A CN 202011200778 A CN202011200778 A CN 202011200778A CN 112519087 A CN112519087 A CN 112519087A
- Authority
- CN
- China
- Prior art keywords
- compression
- plug
- rubber
- teflon
- cavity
- 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.)
- Withdrawn
Links
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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/0053—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor combined with a final operation, e.g. shaping
- B29C45/0055—Shaping
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61J—CONTAINERS SPECIALLY ADAPTED FOR MEDICAL OR PHARMACEUTICAL PURPOSES; DEVICES OR METHODS SPECIALLY ADAPTED FOR BRINGING PHARMACEUTICAL PRODUCTS INTO PARTICULAR PHYSICAL OR ADMINISTERING FORMS; DEVICES FOR ADMINISTERING FOOD OR MEDICINES ORALLY; BABY COMFORTERS; DEVICES FOR RECEIVING SPITTLE
- A61J1/00—Containers specially adapted for medical or pharmaceutical purposes
- A61J1/14—Details; Accessories therefor
- A61J1/1412—Containers with closing means, e.g. caps
-
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/1418—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles the inserts being deformed or preformed, e.g. by the injection pressure
-
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/14467—Joining articles or parts of a single article
-
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/2602—Mould construction elements
-
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/34—Moulds having venting means
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K13/00—Use of mixtures of ingredients not covered by one single of the preceding main groups, each of these compounds being essential
- C08K13/02—Organic and inorganic ingredients
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/06—Sulfur
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/09—Carboxylic acids; Metal salts thereof; Anhydrides thereof
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/13—Phenols; Phenolates
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/36—Sulfur-, selenium-, or tellurium-containing compounds
- C08K5/45—Heterocyclic compounds having sulfur in the ring
- C08K5/46—Heterocyclic compounds having sulfur in the ring with oxygen or nitrogen in the ring
- C08K5/47—Thiazoles
-
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/0053—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor combined with a final operation, e.g. shaping
- B29C45/0055—Shaping
- B29C2045/0058—Shaping removing 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/1418—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles the inserts being deformed or preformed, e.g. by the injection pressure
- B29C2045/14237—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles the inserts being deformed or preformed, e.g. by the injection pressure the inserts being deformed or preformed outside the mould or mould cavity
- B29C2045/14245—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles the inserts being deformed or preformed, e.g. by the injection pressure the inserts being deformed or preformed outside the mould or mould cavity using deforming or preforming means outside the mould cavity
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2237—Oxides; Hydroxides of metals of titanium
- C08K2003/2241—Titanium dioxide
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2296—Oxides; Hydroxides of metals of zinc
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Engineering & Computer Science (AREA)
- Pharmacology & Pharmacy (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Abstract
The invention relates to a halogenated butyl rubber plug coated with Teflon film, a compression mold and a production process, wherein the rubber plug comprises a plug crown and a plug neck, the plug crown comprises an upper plug crown arranged above and an annular lower plug crown arranged below, the plug neck is externally coated with a Teflon film, the upper end of the Teflon film is bent outwards to form an annular clamping piece, the annular clamping piece is arranged between the upper plug crown and the annular lower plug crown, a plurality of micropores are formed in the annular clamping piece, a plurality of connecting columns are arranged in the micropores, and two ends of each connecting column are respectively and integrally connected with the upper plug crown and the annular lower plug crown. The coated rubber plug prepared by the method has low defective rate, and the prepared rubber plug has good sealing performance and excellent compatibility with medicines.
Description
Technical Field
The invention belongs to the field of rubber plug preparation, and particularly relates to a halogenated butyl rubber plug coated with Teflon film, a profiling mold and a production process.
Background
The medical rubber plug is used as a sealing material which is in direct contact with medicines, and has excellent air tightness, good chemical stability and biological inertia, so that the medical rubber plug is isolated from the outside to prevent the medicine raw materials from being oxidized or deliquesced and deteriorated; on the other hand, the medicinal rubber plug cannot react with the raw materials of the medicine to affect the quality of the medicine.
The materials used for producing the rubber plug for the medicine at present mainly comprise natural rubber, polyisoprene rubber, butyl rubber and halogenated butyl rubber, and under the normal condition, a plurality of compounding agents are added and mixed uniformly, and then the rubber plug is prepared by adopting a mould pressing vulcanization process. Various compounding agents in a compounding system supporting the characteristic of forming the rubber stopper have different chemical activities, the rubber stopper is in direct contact with raw materials of medicines, chemically active substances in a formula and the medicines generate chemical reactions, and the chemical reactions directly influence the stability of the medicines. So, strictly speaking, the effect of the rubber stopper on the stability of the sealed medicine is not a question of how long and how much the medicine is contaminated. Meanwhile, in order to isolate direct contact between the rubber material of the rubber plug and the medicine raw materials, the rubber plug film coating technology is carried out; currently, examples of the film material that can be used for the rubber plug include a polydimethylsiloxane film, a parylene film, an ETFE film, and a polyester film. Although the compatibility of the rubber plug and the medicine can be solved to a certain degree, the compatibility problem can be solved only under fixed conditions or in specific medicines by each membrane material, the application range is narrow, at present, the new medicines are diversified, and the activity difference of the medicines is large, so that the problem of the compatibility with the medicine raw materials cannot be solved up to now due to the limitation of the material and formula level of the medicinal rubber plug.
Teflon (polytetrafluoroethylene) is a polymer prepared by polymerizing tetrafluoroethylene as a monomer, is white wax-like, semitransparent, heat-resistant and cold-resistant, and can be used at the temperature of minus 180-260 ℃ for a long time. The material has the characteristics of acid resistance, alkali resistance and various organic solvents resistance, and is almost insoluble in all solvents. The first choice film material for solving the problem of compatibility between the rubber plug and the medicine is provided, however, because the difference between the material and the rubber material is large, the processing temperature difference is large, and the thermoplastic property is not provided, the following problems often exist in the film laminating process by adopting the conventional method: 1) the material of the membrane material has no elasticity, so that the sealing performance between the rubber plug and the glass bottle opening is influenced; 2) after the membrane material and rubber are hot-pressed, the rubber plug is shaped together in a vulcanization process to form a plug neck, the shape of the rubber plug is complex, particularly the rubber plug with a groove at the bottom of the plug neck needs to be subjected to downward and upward deformation forces in the shaping process, and meanwhile due to the difference of the material properties of the membrane material and the rubber plug, the membrane material and the rubber plug are easy to bulge and be bonded firmly, the problem that the membrane layer is easy to fall off in the subsequent cleaning process is solved, the yield is low, particularly for the Teflon material, the Teflon material is hard, the heat-resistant temperature is high, the deformation property is poor at the vulcanization temperature of the rubber plug, the yield is extremely low, and the application of the Teflon material in rubber plug coating is limited.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a halogenated butyl rubber plug coated with Teflon, a profiling mold and a production process.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the first technical scheme is as follows:
a production process of a halogenated butyl rubber plug coated by Teflon comprises the following steps:
step 1, manufacturing a Teflon blank into a film material which is smooth in bottom surface, rough in top surface and provided with concave-convex pits, punching a plurality of circles of micropores on the edge of the concave-convex pits of the film material, and cutting the film material into a blocky Teflon membrane; the cross section of the concave-convex pit is arc-shaped, or the shape and the size of the concave-convex pit are matched with the plug neck;
and step 5, vulcanization: placing the semi-formed diaphragm in a cavity of a vulcanization mold, placing a bulge at the bottom of the semi-formed diaphragm in a rubber plug groove of the vulcanization cavity, closing the mold, and vulcanizing to prepare a film-coated rubber plug sheet; the vulcanization temperature is 170-200 ℃; the vulcanization time is 10-12 min;
and 6, punching, cleaning and packaging the film-coated rubber plug sheet to obtain the film-coated rubber plug.
Further, in the step 3, before the rubber bottom sheet and the Teflon membrane are placed in the cavity of the compression female die, the Teflon membrane is covered on the rubber bottom sheet, and hot-pressing lamination is carried out at the temperature of 80 ℃ and under the pressure of 0.5-0.7 MPa.
Furthermore, a hole of stepping down has been still seted up on the rubber film, the die mould bed die still is provided with a plurality of lugs, be provided with the evacuation board on the lug, in step 3, when arranging the die mould bed die in the die cavity of die mould bed die, the lug inserts in the hole of stepping down, after the die mould bed die is arranged in the die cavity of die mould bed die, still need open evacuating device, adsorb the teflon diaphragm and be fixed in on the evacuation board, after step 4 cooling forming, before the die sinking, still need close evacuating device.
Further, the unvulcanized rubber sheet is obtained by banburying, milling, extruding, calendering and cooling a rubber raw material.
Further, the unvulcanized rubber sheet is prepared by the following process: step a, weighing the following raw materials in parts by weight: 100 parts of halogenated butyl rubber, 1-4 parts of vulcanizing agent sulfur, 0.5-3 parts of accelerant 2, 2' -dithiodibenzothiazyl, 2-10 parts of zinc oxide, 1-4 parts of stearic acid, 30-60 parts of filler calcined clay, 10-20 parts of plasticizer vaseline, 0.4-3 parts of antioxidant 2, 6-di-tert-butyl-p-cresol, 3-15 parts of titanium dioxide and 0.1-10 parts of pigment;
b, adding halogenated butyl rubber, filler calcined argil, an accelerator 2, 2' -dithiodibenzothiazole, zinc oxide, stearic acid, a plasticizer vaseline, an antioxidant 2, 6-di-tert-butyl-p-cresol, titanium dioxide, a pigment and a vulcanizing agent sulfur into an internal mixer in sequence, and mixing at 100-110 ℃ to obtain a rubber material;
c, blanking a part of rubber sizing material after mixing is finished, cooling to below 60 ℃, rolling and storing for 1-2 days;
d, discharging the slices by using an open mill, cooling to 20-25 ℃ at the temperature of 65-75 ℃; and (5) obtaining the product.
And further, the other part of the rubber compound prepared in the step b is used in the step 4 and enters an extruder for extrusion.
Furthermore, the weight part of the plasticizer vaseline used in the preparation of the unvulcanized rubber sheet in the step 2 is 5-15 parts less than that of the plasticizer vaseline used in the preparation of the rubber compound in the step 4.
Furthermore, the weight part of plasticizer vaseline used for preparing the unvulcanized rubber sheet in the step 2 is 10-15 parts;
in the step 4, 15-20 parts by weight of vaseline is used as a plasticizer in the preparation of the rubber material.
Further, when the cross section of the concave-convex pit is arc-shaped, the diameter of the concave-convex pit is equal to that of the plug neck.
The second technical scheme is as follows:
the compression mold comprises a compression female mold and a compression male mold, wherein the compression female mold and the compression male mold are assembled to form a compression cavity, the compression cavity comprises a compression lower cavity, a compression upper cavity and a pre-forming groove, the compression upper cavity is communicated with the compression lower cavity, the compression female mold and the compression male mold are respectively provided with a heat exchange pipeline, and the heat exchange pipeline is provided with a heat exchange medium inlet and a heat exchange medium outlet.
Furthermore, a plurality of convex blocks are further arranged on the compression female die, a vacuumizing plate is arranged on each convex block, and a vacuumizing device is arranged on an air exhaust hole of the vacuumizing plate through a vacuumizing pipeline.
The third technical scheme is as follows:
the utility model provides a halogenated butyl rubber stopper by teflon tectorial membrane, includes stopper hat and the stopper neck of being made by halogenated butyl rubber, the stopper hat is including going up the stopper hat, and set up in stopper hat down of annular of going up stopper hat below, the stopper neck is covered outward and is equipped with the teflon film, the upper end of teflon film forms the annular clamping piece after outwards bending, the annular clamping piece set up in go up between stopper hat and the annular lower stopper hat.
Furthermore, a plurality of micropores are formed in the annular clamping sheet, a plurality of connecting columns are arranged in the micropores, and two ends of each connecting column are respectively and integrally connected with the upper plug crown and the annular lower plug crown.
Furthermore, the bottom of the plug neck is provided with an upward groove, and the depth of the groove is 1/2-2/3 of the height of the plug neck.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, the halogenated butyl rubber plug is coated by the Teflon material, and the Teflon material has excellent chemical stability and excellent non-stick property, and the highest use temperature can reach 200 ℃, so that the problem of compatibility of the rubber plug and medicines in direct contact is solved, and the applicable medicine range is wider.
According to the invention, the film coating process of the Teflon film-coated halogenated butyl rubber plug is improved, the forming of the plug neck of the rubber plug is divided into 2 steps, before the Teflon and the rubber material are compounded, concave-convex pits are firstly pressed on the Teflon film, the preforming of the plug neck shape (preforming into a complete plug neck shape or preforming into a semi-finished product protruding downwards) is realized, then the plug neck is finally formed in the vulcanization process, and the problem of film layer bulging caused by the hard Teflon material in the Teflon deformation process is solved.
According to the invention, the top surface of the Teflon membrane is roughened, and the rubber material is injected and pressed above the Teflon membrane, so that the cohesiveness of the Teflon material and the rubber material is improved, and the problem that the Teflon membrane layer is easy to fall off is solved. When the rubber material is injected into the compression mold, the temperature of the compression male mold is controlled to be 100-110 ℃, so that the flowability of the rubber material is enhanced, the temperature of the compression female mold is controlled to be lower than 70 ℃, so that the deformation rate of the rubber bottom sheet under the heating condition is reduced, the rubber bottom sheet can play a supporting role, the semi-formed rubber sheet is shaped, the phenomenon that the rubber material on the rubber bottom sheet excessively flows to the outer side of the Teflon membrane in the pre-forming and vulcanizing process is avoided, the Teflon membrane is covered to form defective products, and finally the Teflon membrane on the outer wall of the cork neck is covered by the rubber, so that the rubber material is directly contacted with a medicine is avoided The outer side of the diaphragm causes defective products.
According to the invention, the rubber bottom sheet is arranged below the Teflon membrane, so that the stopper crown part of the prepared rubber stopper is of a sandwich structure without an intermediate layer of Teflon material, and after the glass bottle is sealed by the rubber stopper, the rubber stopper is still made of elastic rubber material which is in direct contact with the top of the glass bottle, so that the problem of poor sealing caused by direct contact of the Teflon material with the mouth of the glass bottle when the Teflon material is below the glass bottle is solved;
according to the invention, the micropores are arranged on the edge of the concave-convex pit of the Teflon membrane, so that the connecting column for connecting the upper plug crown and the annular lower plug crown is formed on the prepared rubber plug, and the annular lower plug crown is prevented from falling off in the subsequent cleaning and using process.
Drawings
FIG. 1 is a schematic view of the construction of a calender roll set according to an embodiment of the present invention;
FIG. 2 is a schematic view of a compression mold according to an embodiment of the present invention;
FIG. 3 is an enlarged view of FIG. 2 at A;
FIG. 4 is a schematic structural view of a vulcanizing mold used in one embodiment of the present invention;
FIG. 5 is a schematic structural view of the rubber plug of the present invention;
fig. 6 is a schematic structural view of the rubber plug defective.
In the figure, 1, an upper roller, 2, a lower roller, 3, a bulge, 4, a concave-convex pit, 5, a profiling male die, 6, a profiling female die, 7, a heat exchange pipeline, 8, a heat exchange medium inlet, 9, a heat exchange medium outlet, 10, a preforming groove, 11, a profiling upper cavity, 12, a profiling lower cavity, 13, a rubber bottom plate, 14, a Teflon membrane, 15, a bump, 16, a plug crown, 17, a plug neck, 18, a groove, 19, an upper plug crown, 20, a lower plug crown, 21, a connecting column, 22, a micropore, 23, a vacuum tube, 24, a vacuum pumping device, 25 circular holes, 26, a Teflon membrane, 27, an annular clamping piece, 28, a vulcanizing female die, 29, a vulcanizing male die, 30 and a vulcanizing die cavity.
Detailed Description
The invention is further illustrated by the following examples.
Example 1:
as shown in fig. 5, the invention discloses a teflon-coated halogenated butyl rubber plug, which comprises a plug crown 16 and a plug neck 17, wherein the plug crown 16 is made of halogenated butyl rubber, the plug crown 16 comprises an upper plug crown 19 and an annular lower plug crown 20 arranged below the upper plug crown 19, a teflon film 26 is arranged outside the plug neck 17, the upper end of the teflon film 26 is bent outwards to form an annular clamping piece 27, and the annular clamping piece 27 is arranged between the upper plug crown 19 and the annular lower plug crown 20. The arrangement of the annular lower plug crown 20 solves the problem of sealing between the rubber plug and the bottleneck of the glass bottle.
Further, a plurality of micropores 22 are formed in the annular clamping piece 27, a plurality of connecting columns 21 are formed in the micropores 22, and two ends of each connecting column 21 are respectively connected with the upper plug crown 19 and the annular lower plug crown 20 integrally. The arrangement of the connecting column 21 solves the problem that the annular lower plug crown 20 is easy to fall off.
Furthermore, the bottom of the plug neck 17 is provided with an upward groove 18, the depth of the groove 18 is 1/2-2/3 of the height of the plug neck 17, and the problem of plug jumping of the rubber plug is solved by the arrangement of the groove 18.
Example 2:
the invention discloses a production process of a halogenated butyl rubber plug coated with Teflon film, which is used for producing the halogenated butyl rubber plug coated with Teflon film in the embodiment 1, and specifically comprises the following steps:
step 1, manufacturing a Teflon blank into a film material which is smooth in bottom surface, rough in top surface and provided with concave-convex pits 4, punching a plurality of circles of micropores 22 on the edge of the concave-convex pits 4 of the film material, and cutting the film material into a blocky Teflon membrane 14; the shape of the concave-convex pit 4 is matched with that of the plug neck 17;
wherein, the Teflon blank is formed by molding, sintering and cooling Teflon resin;
the process of preparing the film material with smooth bottom surface, rough top surface and concave-convex pits 4 from the Teflon blank comprises the following steps: after turning the Teflon blank, calendering to enable the surface of the upper roller 1 of the roller group used for calendering the Teflon membrane 14 to be smooth in bottom surface and rough in top surface to be rough, and the surface of the lower roller 2 to be smooth, and then molding by adopting a mold to form the Teflon membrane 14 with the concave-convex pits 4 matched with the shape of the plug neck 17.
step a, weighing the following raw materials in parts by weight: 100 parts of halogenated butyl rubber, 1.5 parts of vulcanizing agent sulfur, 1.5 parts of accelerator 2, 2' -dithiodibenzothiazyl, 4 parts of zinc oxide, 1.8 parts of stearic acid, 55 parts of filler calcined argil, 15 parts of plasticizer vaseline, 0.5 part of antioxidant 2, 6-di-tert-butyl-p-cresol, 10 parts of titanium dioxide and 1.0 part of pigment;
b, adding halogenated butyl rubber, filler calcined argil, an accelerator 2, 2' -dithiodibenzothiazole, zinc oxide, stearic acid, a plasticizer vaseline, an antioxidant 2, 6-di-tert-butyl-p-cresol, titanium dioxide, a pigment and a vulcanizing agent sulfur into an internal mixer in sequence, and mixing at 100-110 ℃ to obtain a rubber material;
c, blanking a part of rubber sizing material after mixing is finished, cooling to below 60 ℃, rolling and storing for 1-2 days;
d, discharging the slices by using an open mill, cooling to 20-25 ℃ at the temperature of 65-75 ℃; and (5) obtaining the product.
And 3, placing the rubber bottom sheet 13 and the Teflon membrane 14 in front of a cavity of the compression female die 6, covering the Teflon membrane 14 on the rubber bottom sheet, and performing hot-pressing lamination, wherein the hot-pressing lamination temperature is 80 ℃ and the pressure is 0.5-0.7 MPa.
the rubber compound is derived from the rubber compound in step 2.
And 6, vulcanizing: placing the semi-formed diaphragm in a cavity of a vulcanization mold, placing a bulge at the bottom of the semi-formed diaphragm in a rubber plug groove of a vulcanization cavity 30, closing the mold, and vulcanizing to prepare a film-coated rubber plug sheet; the vulcanization temperature is 170-200 ℃; the vulcanization time is 10-12 min;
and 7, punching, cleaning and packaging the film-coated rubber plug sheet to obtain the film-coated rubber plug.
The compression mold used in the embodiment comprises a compression female mold 6 and a compression male mold 5, wherein the compression female mold 6 and the compression male mold 5 are assembled to form a compression cavity, the compression cavity comprises a compression lower cavity 12, a compression upper cavity 11 and a pre-forming groove 10, the compression upper cavity 11 is communicated with the compression lower cavity 12, the compression female mold 6 and the compression male mold 5 are respectively provided with a heat exchange pipeline 7, and the heat exchange pipeline 7 is provided with a heat exchange medium inlet 8 and a heat exchange medium outlet 9.
The total defective rate of 1000 rubber plugs produced in this example was calculated to be 0.1% by visual inspection, wherein the defective rate due to the falling off of the bulge and teflon film layer was 0, the defective rate due to the inner side of the lower crown flowing out of the teflon film as shown in fig. 6 was 0.07%, and the defective rate due to other reasons was 0.03%.
Example 3
The invention discloses a production process of a halogenated butyl rubber plug coated with Teflon film, which is used for producing the halogenated butyl rubber plug coated with Teflon film in the embodiment 1, and specifically comprises the following steps:
step 1, rolling a Teflon blank to prepare a film material which is smooth in bottom surface, rough in top surface and provided with concave-convex pits 4, punching a plurality of circles of micropores 22 on the edge of the concave-convex pits 4 of the film material, and cutting the film material into a blocky Teflon membrane 14; the cross section of the concave-convex pit 4 is arc-shaped; the diameter of the top of the concave-convex pit 4 is equal to the outer diameter of the plug neck 17.
Wherein, the Teflon blank is formed by molding, sintering and cooling Teflon resin;
as shown in figure 1, the surface of the upper roller 1 of the roller set used for rolling is rough, a plurality of bulges 3 are uniformly arranged, and the surface of the lower roller 2 is smooth.
wherein the preparation process of the unvulcanized rubber sheet is as follows:
step a, weighing the following raw materials in parts by weight: 100 parts of halogenated butyl rubber, 1.5 parts of vulcanizing agent sulfur, 1.5 parts of accelerator 2, 2' -dithiodibenzothiazyl, 4 parts of zinc oxide, 1.8 parts of stearic acid, 55 parts of filler calcined argil, 15 parts of plasticizer vaseline, 0.5 part of antioxidant 2, 6-di-tert-butyl-p-cresol, 10 parts of titanium dioxide and 1.0 part of pigment;
b, adding halogenated butyl rubber, filler calcined argil, an accelerator 2, 2' -dithiodibenzothiazole, zinc oxide, stearic acid, a plasticizer vaseline, an antioxidant 2, 6-di-tert-butyl-p-cresol, titanium dioxide, a pigment and a vulcanizing agent sulfur into an internal mixer in sequence, and mixing at 100-110 ℃ to obtain a rubber material;
c, blanking a part of rubber sizing material after mixing is finished, cooling to below 60 ℃, rolling and storing for 1-2 days;
d, discharging the slices by using an open mill, cooling to 20-25 ℃ at the temperature of 65-75 ℃; and (5) obtaining the product.
the rubber compound is derived from the rubber compound in step 2.
And step 5, vulcanization: placing the semi-formed diaphragm in a cavity of a vulcanization mold, placing a bulge at the bottom of the semi-formed diaphragm in a rubber plug groove of a vulcanization cavity 30, closing the mold, and vulcanizing to prepare a film-coated rubber plug sheet; the vulcanization temperature is 170-200 ℃; the vulcanization time is 10-12 min;
and 6, punching, cleaning and packaging the film-coated rubber plug sheet to obtain the film-coated rubber plug.
As shown in fig. 2 to 3, the compression mold used in this embodiment includes a compression female mold 6 and a compression male mold 5, the compression female mold 6 and the compression male mold 5 are assembled to form a compression cavity, the compression cavity includes a compression lower cavity 12, a compression upper cavity 11 and a pre-forming groove 10, the compression lower cavity 12 is communicated with the compression lower cavity 12, the compression female mold 6 and the compression male mold 5 are respectively provided with a heat exchange pipeline 7, and the heat exchange pipeline 7 is provided with a heat exchange medium inlet 8 and a heat exchange medium outlet 9; the compression type female die 6 is further provided with a plurality of bumps 15, the bumps 15 are provided with vacuum-pumping plates, and the air-pumping holes of the vacuum-pumping plates are provided with vacuum-pumping devices 24 through vacuum-pumping pipes 23.
The total defective rate of 10000 rubber plugs prepared in this example is 0.1%, wherein the defective rate caused by the falling of the bulge and the teflon film layer is 0; the defect rate caused by the inner side of the lower plug crown flowing down to the outside of the teflon film as shown in fig. 6 is 0.06%, and the defect rate caused by other reasons is 0.04%.
Example 4
The invention discloses a production process of a halogenated butyl rubber plug coated with Teflon film, which is used for producing the halogenated butyl rubber plug coated with Teflon film in the embodiment 1, and specifically comprises the following steps:
the same as example 2, except that in step 2, the amount of the plasticizer vaseline was 10 parts when the unvulcanized rubber sheet was prepared; in the step 4, when the rubber sizing material is prepared, the using amount of the plasticizer vaseline is 20 parts; the other parameters in the rubber compound preparation process are the same as in step 2.
The defective products were visually detected from 10000 rubber plugs manufactured in this example, and the total defective rate was calculated to be 0.01%, wherein the defective rate due to the falling off of the bulge and the teflon film layer was 0, the defective rate due to the inner side edge of the lower plug crown flowing to the outside of the teflon film as shown in fig. 6 was 0, and the defective rate due to other reasons was 0.01%.
Comparative example 1:
a production process of a teflon-coated halogenated butyl rubber plug, which is used for producing the teflon-coated halogenated butyl rubber plug described in example 1, and specifically comprises the following steps:
the method is the same as the method in the embodiment 3, except that in the step 4, the temperature of the pressing female die 6 and the temperature of the pressing male die 5 are the same and are both 100-110 ℃.
The defective products were visually detected from 10000 rubber plugs manufactured in this example, and the total defective rate was calculated to be 50%, wherein the defective rate due to the falling of the bulge and the teflon film layer was 0, the defective rate due to the inner side edge of the lower crown flowing outside the teflon film as shown in fig. 6 was 49.95%, and the defective rate due to other reasons was 0.05%.
COMPARATIVE EXAMPLE 2 (conventional Process)
A production process of a halogenated butyl rubber plug coated with Teflon specifically comprises the following steps:
step 1, weighing the following raw materials in parts by weight: 100 parts of halogenated butyl rubber, 1.5 parts of vulcanizing agent sulfur, 1.5 parts of accelerator 2, 2' -dithiodibenzothiazyl, 4 parts of zinc oxide, 1.8 parts of stearic acid, 55 parts of filler calcined argil, 15 parts of plasticizer vaseline, 0.5 part of antioxidant 2, 6-di-tert-butyl-p-cresol, 10 parts of titanium dioxide and 1.0 part of pigment;
step 8, placing the plug neck under a vulcanizing device for secondary vulcanization, then laying a rubber sheet above the plug neck, closing the die, and carrying out secondary vulcanization, wherein the vulcanizing temperature is 170-200 ℃; the vulcanization time is 10-12 min;
and 9, punching and cleaning the film subjected to secondary vulcanization to obtain the halogenated butyl rubber plug coated with the Teflon film.
The 10000 rubber plugs produced in this example were visually inspected to find defective products, and the total defective rate was calculated to be 20.5%, wherein the defective rate due to the falling off of the bulge and the teflon film layer was 19.7%, the defective rate due to the inner side of the lower crown flowing down to the outside of the teflon film as shown in fig. 6 was 0%, and the defective rate due to other reasons was 0.8%.
Test example:
the rubber plugs without surface defects (the rubber plugs qualified by visual inspection are subjected to performance detection, and the results are shown in the following table;
and (3) detecting the composite strength of the coating: randomly taking 500 products which are qualified by visual inspection, naturally piling the products in an open stainless steel cup, putting the stainless steel cup into a high-pressure steam sterilizer, keeping the temperature at 121 +/-2 ℃ for 30 minutes, taking the products out, putting the products into a 60 ℃ oven, keeping the temperature for 60 minutes, taking the products out, naturally cooling the products in the air to room temperature, observing that the film layer and the rubber layer should not bulge or delaminate, and obtaining the qualified rate of the composite strength of the film layer, namely the qualified rate of the composite strength of the film layer is qualified (the total test amount of the rubber plugs-the number of the rubber plugs with bulge or delamination of the film layer and the rubber layer/the total test amount of the rubber;
insoluble microparticles: taking the equivalent of a surface area of 100cm2A plurality of complete rubber plugs are arranged, and the number of the complete rubber plugs is less than 60 particles with the particle size of more than 10 mu m and less than 6 particles with the particle size of more than 25 mu m in each 1ml according to a packaging material insoluble particle determination method (determined under the item of YBB00272004-2015 medicinal rubber plugs).
Chemical properties: preparation of a test solution: taking the equivalent of 200cm of surface area2A plurality of complete rubber plugs according to the surface area (cm) of a sample2) The ratio of water to water (ml) was 1:2, 400ml water was added for immersion, boiled for 5 minutes, allowed to cool, and then rinsed 5 times with the same volume of water. Transferring into a conical flask, adding 400ml of water, placing in a high-pressure steam sterilizer, keeping at 121 + -2 deg.C for 30 min, cooling to room temperature, and removing to obtain the test solution. The blank liquid is prepared by the same method, and the clarity, color, pH change value, absorbance, oxidability, non-volatile matter, heavy metal, ammonium ion, zinc ion and conductivity test are carried out.
TABLE 1
The embodiments described above are only preferred embodiments of the invention and are not exhaustive of the possible implementations of the invention. Any obvious modifications to the above would be obvious to those of ordinary skill in the art, but would not bring the invention so modified beyond the spirit and scope of the present invention.
Claims (10)
1. A production process of a halogenated butyl rubber plug coated with Teflon film is characterized by comprising the following steps:
step 1, manufacturing a Teflon blank into a film material which is smooth in bottom surface, rough in top surface and provided with concave-convex pits (4), punching a plurality of circles of micropores (22) on the edge of the concave-convex pits (4) of the film material, and cutting the film material into a blocky Teflon film (14); the cross section of the concave-convex pit (4) is arc-shaped, or the shape and the size of the concave-convex pit (4) are matched with the plug neck (17);
step 2, cutting a plurality of circular holes (25) on the unvulcanized rubber sheet to prepare a rubber bottom sheet (13);
step 3, placing a rubber bottom sheet (13) and a Teflon diaphragm (14) in a cavity of a compression female die (6), placing the Teflon diaphragm (14) above the rubber bottom sheet (13), aligning a circular hole (25) in the rubber bottom sheet (13) with a pre-forming groove (10) in the compression female die (6), placing a concave-convex pit (4) in the Teflon diaphragm (14) in the pre-forming groove (10) in the compression female die (6) through the circular hole (25), and then closing the compression female die (6) and the compression male die (5); the mold closing pressure is 1600-1800 kn, and a compression mold cavity formed by closing the compression female mold (6) and the compression male mold (5) is divided into a compression upper cavity and a compression lower cavity by a Teflon diaphragm (14); wherein, the rubber bottom sheet is arranged in the membrane pressing cavity; the overall shape formed by a preformed groove (10) on the compression female die (6) and a circular hole (25) on the rubber bottom sheet (13) is matched with the shape of a concave-convex pit (4) on the Teflon membrane (14);
step 4, extruding a rubber material at 100-110 ℃ through an extruder at the temperature of the compression female die (6) being lower than 70 ℃, injecting the rubber material into a compression upper cavity at high pressure, cooling and forming after injection, and opening the die to obtain a semi-formed rubber sheet, wherein the injection pressure of the rubber material is 120 bar;
and step 5, vulcanization: placing the semi-formed diaphragm in a cavity of a vulcanization mold, placing a bulge (3) at the bottom of the semi-formed diaphragm in a rubber plug groove of the vulcanization cavity, closing the mold, and vulcanizing to prepare a film-coated rubber plug sheet; the vulcanization temperature is 170-200 ℃; the vulcanization time is 10-12 min;
and 6, punching, cleaning and packaging the film-coated rubber plug sheet to obtain the film-coated rubber plug.
2. The production process of the halogenated butyl rubber plug covered by the teflon film according to the claim 1, wherein in the step 3, the rubber bottom sheet (13) and the teflon film sheet (14) are placed in the cavity of the compression female die (6), the teflon film sheet (14) is covered on the rubber bottom sheet, and hot-press bonding is carried out, wherein the hot-press bonding temperature is 80 ℃, and the pressure is 0.5 MPa-0.7 MPa.
3. The production process of the halogenated butyl rubber plug coated with the Teflon film according to claim 1, wherein a abdicating hole is further formed in the rubber bottom plate, the compression female die (6) is further provided with a plurality of convex blocks (15), a vacuumizing plate is arranged on each convex block (15), in the step 3, when the compression bottom plate is placed in a cavity of the compression female die (6), the convex blocks (15) are inserted into the abdicating holes, after the compression bottom plate is placed in the cavity of the compression female die (6), the vacuumizing device (24) needs to be started, the Teflon film (14) is adsorbed and fixed on the vacuumizing plate, and after the step 4 is cooled and formed, the vacuumizing device (24) needs to be closed before the die is opened.
4. The process for producing a teflon-coated halogenated butyl rubber plug as claimed in claim 1, wherein the unvulcanized rubber sheet is obtained by banburying, milling, extruding, calendering and cooling a rubber raw material.
5. A process for the production of teflon-coated halogenated butyl rubber stoppers according to claim 1, characterized in that when the cross-section of the concave-convex pits (4) is arc-shaped, the diameter of the concave-convex pits (4) is equal to the diameter of the stopper neck (17).
6. The compression mold for the halogenated butyl rubber plug coated with Teflon is characterized by comprising a compression female mold (6) and a compression male mold (5), wherein the compression female mold (6) and the compression male mold (5) are assembled to form a compression mold cavity, the compression mold cavity comprises a compression lower cavity (12), a compression upper cavity (11) and a pre-forming groove (10), the compression lower cavity (12) is communicated with the compression upper cavity (11), heat exchange pipelines (7) are respectively arranged on the compression female mold (6) and the compression male mold (5), and heat exchange medium inlets (8) and heat exchange medium outlets (9) are arranged on the heat exchange pipelines (7).
7. A compression mould for halogenated butyl rubber plug covered by Teflon (R) according to claim 6, wherein a plurality of bumps (15) are further arranged on the compression female mould (6), a vacuum-pumping plate is arranged on the bumps (15), and a vacuum-pumping device (24) is arranged at the suction hole of the vacuum-pumping plate through a vacuum-pumping pipe (23).
8. The halogenated butyl rubber plug coated with the Teflon film comprises a plug crown (16) and a plug neck (17), wherein the plug crown (16) is made of halogenated butyl rubber, the halogenated butyl rubber plug is characterized in that the plug crown (16) comprises an upper plug crown (19) and an annular lower plug crown (20) arranged below the upper plug crown (19), the plug neck (17) is externally provided with a Teflon film (26), the upper end of the Teflon film (26) is bent outwards to form an annular clamping piece (27), and the annular clamping piece (27) is arranged between the upper plug crown (19) and the annular lower plug crown (20).
9. The halogenated butyl rubber plug covered by Teflon film according to claim 8, wherein a plurality of micropores (22) are formed on the annular clamping piece (27), a plurality of connecting columns (21) are formed in the micropores (22), and two ends of each connecting column (21) are respectively and integrally connected with the upper plug crown (19) and the annular lower plug crown (20).
10. A Teflon coated halogenated butyl rubber plug according to claim 8, wherein the bottom of the plug neck (17) is provided with an upward groove (18), and the depth of the groove (18) is 1/2-2/3 of the height of the plug neck (17).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011200778.9A CN112519087A (en) | 2020-11-02 | 2020-11-02 | Halogenated butyl rubber plug coated with Teflon film, profiling mold and production process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011200778.9A CN112519087A (en) | 2020-11-02 | 2020-11-02 | Halogenated butyl rubber plug coated with Teflon film, profiling mold and production process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112519087A true CN112519087A (en) | 2021-03-19 |
Family
ID=74979340
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011200778.9A Withdrawn CN112519087A (en) | 2020-11-02 | 2020-11-02 | Halogenated butyl rubber plug coated with Teflon film, profiling mold and production process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112519087A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114288180A (en) * | 2021-12-22 | 2022-04-08 | 湖北华强科技股份有限公司 | Piston for pen type injector of explosion-proof plug |
-
2020
- 2020-11-02 CN CN202011200778.9A patent/CN112519087A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114288180A (en) * | 2021-12-22 | 2022-04-08 | 湖北华强科技股份有限公司 | Piston for pen type injector of explosion-proof plug |
| CN114288180B (en) * | 2021-12-22 | 2024-05-17 | 湖北华强科技股份有限公司 | Piston for pen-type injector of explosion-proof plug |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102218810B (en) | Method for producing a liner of a vessel | |
| CN101864807B (en) | Vibration-isolating rubber bearing for building and manufacturing method thereof | |
| CN101259080B (en) | Silicification free transfusion bottle stopper and manufacturing method thereof | |
| CN112519087A (en) | Halogenated butyl rubber plug coated with Teflon film, profiling mold and production process | |
| CN101427979A (en) | Method for preparing semi-coating medical rubber plug | |
| CN110218455A (en) | A kind of low compression set rubber roller silicon rubber and preparation method thereof | |
| CN110423404B (en) | Film pasting box and preparation process thereof | |
| CN202498764U (en) | Polytetrafluoroethylene isostatic pressure molding device | |
| CN111745948A (en) | Film covering process for segmented pulp bottle blank and production process for segmented pulp bottle blank | |
| CN112409710B (en) | Freeze-dried tectorial membrane butyl rubber plug and preparation method thereof | |
| CN205272416U (en) | Vacuum auxiliary exhaust formula segmented mold utensil | |
| CN107049778B (en) | Easy-to-fold combined cover for infusion container and infusion container | |
| CN206011688U (en) | A kind of plastic extruder vacuum pumping hardware | |
| CN104002460A (en) | Graphite pipe manufacturing method for eliminating extruding internal stress and microcracks | |
| JP6005250B2 (en) | Manufacturing method of gasket for secondary battery | |
| CN106182398A (en) | A kind of moulding process of ceramic plunger | |
| CN112476920A (en) | Halogenated butyl rubber plug die assembly and pressing die structure | |
| CN112321957A (en) | High-cleanness rubber plug | |
| CN107673942B (en) | Design method of small-size single-hole propellant mold | |
| CN110497671B (en) | High-barrier composite layer medical infusion bag and production method thereof | |
| CN108003403A (en) | A kind of rubber of Medical rubber plug and preparation method thereof | |
| CN220219312U (en) | Forming die for thick rubber pad with multilayer filler | |
| CN101200571B (en) | Elastomer material having obstructing function and method for making same | |
| CN115819897B (en) | Brominated butyl/polyisoprene rubber gasket and production method thereof | |
| CN114714601A (en) | Double-layer medical infusion bottle and manufacturing method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20210319 |