CN113292790A - CPP film and production process thereof - Google Patents
CPP film and production process thereof Download PDFInfo
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- CN113292790A CN113292790A CN202110577949.8A CN202110577949A CN113292790A CN 113292790 A CN113292790 A CN 113292790A CN 202110577949 A CN202110577949 A CN 202110577949A CN 113292790 A CN113292790 A CN 113292790A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B7/00—Mixing; Kneading
- B29B7/80—Component parts, details or accessories; Auxiliary operations
- B29B7/802—Constructions or methods for cleaning the mixing or kneading device
-
- 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
- B29C37/00—Component parts, details, accessories or auxiliary operations, not covered by group B29C33/00 or B29C35/00
- B29C37/02—Deburring or deflashing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D7/00—Producing flat articles, e.g. films or sheets
- B29D7/01—Films or sheets
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/10—Homopolymers or copolymers of propene
- C08J2323/12—Polypropene
-
- 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
- C08K7/00—Use of ingredients characterised by shape
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Thermal Sciences (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Abstract
The invention discloses a CPP film and a production process thereof, wherein the production process specifically comprises the following steps: weighing and proportioning 96 parts, 20 parts, 0.3 part, 0.5 part, 0.4 part and 5 parts of polypropylene resin, halogen-free flame retardant, anti-dripping agent, antioxidant and aluminum foil filler, putting 96 parts of polypropylene resin, 20 parts of halogen-free flame retardant, 0.3 part of anti-dripping agent, 0.5 part of heat stabilizer, 0.4 part of antioxidant and 5 parts of aluminum foil filler into a high-speed stirrer for stirring and mixing, and conveying the mixed master batch obtained in the step two into a double-screw extruder by a feeding machine for melt extrusion granulation; according to the CPP film and the production process thereof, the mixed master batch can be effectively prevented from being accumulated on the inner wall of the high-speed stirrer, meanwhile, the neatness of the interior of the high-speed stirrer can be increased, the working efficiency of the CPP film preparation is improved, the edge of the CPP film can be subjected to edge cutting and glue sealing, and the attractiveness and stability of the CPP film can be improved.
Description
Technical Field
The invention relates to the field of CPP films, in particular to a CPP film and a production process thereof.
Background
The CPP film is a casting polypropylene film, also called an unstretched polypropylene film, and can be divided into a general CPP film, an aluminized-grade film, a cooking-grade CPP film and the like according to different purposes.
Firstly, in the mixing process, a scraping mechanism is not used for scraping materials on the inner wall of a high-speed mixer, mixed master batches adhered to the inner wall of the high-speed mixer cannot be scraped off, the mixed master batches are easy to accumulate on the inner wall of the high-speed mixer, the materials are accumulated in the high-speed mixer in a mess manner, and the working efficiency of CPP film preparation is not high; secondly, the in-process of making the membrane is not cut edge and is sealed and glue, does not cut edge to the edge of CPP film, can not cut off the burr at CPP film edge, does not seal the glue in the position of cutting edge, and the aesthetic property and the stability of CPP film are relatively poor.
Disclosure of Invention
The invention aims to provide a CPP film and a production process thereof, which solve the problems that no scraping mechanism scrapes materials on the inner wall of a high-speed stirrer in the mixing process of the conventional CPP film, mixed master batch adhered to the inner wall of the high-speed stirrer cannot be scraped off, the mixed master batch is easy to accumulate on the inner wall of the high-speed stirrer, the materials accumulated in the high-speed stirrer are disordered, and the working efficiency of CPP film preparation is not high; secondly, the in-process of making the membrane is not cut edge and is sealed and glue, does not cut edge to the edge of CPP film, can not cut off the burr at CPP film edge, does not seal glue at the position of cutting edge, the aesthetic property of CPP film and the relatively poor technical problem of stability.
The purpose of the invention can be realized by the following technical scheme:
a CPP film is composed of the following raw materials in parts by weight: 95-98 parts of polypropylene resin, 10-30 parts of halogen-free flame retardant, 0.1-0.5 part of anti-dripping agent, 0.4-0.9 part of heat stabilizer, 0.2-0.7 part of antioxidant and 3-8 parts of aluminum foil filler;
preferably, the CPP film comprises the following components in parts by weight: 96 parts of polypropylene resin, 20 parts of halogen-free flame retardant, 0.3 part of anti-dripping agent, 0.5 part of heat stabilizer, 0.4 part of antioxidant and 5 parts of aluminum foil filler;
a production process of a CPP film specifically comprises the following steps:
the method comprises the following steps: proportioning polypropylene resin, a halogen-free flame retardant, an anti-dripping agent, a heat stabilizer, an antioxidant and an aluminum foil filler in a metering ratio of 96 parts, 20 parts, 0.3 part, 0.5 part, 0.4 part and 5 parts;
step two: mixing, namely putting 96 parts of polypropylene resin, 20 parts of halogen-free flame retardant, 0.3 part of anti-dripping agent, 0.5 part of heat stabilizer, 0.4 part of antioxidant and 5 parts of aluminum foil filler into a high-speed mixer for stirring and mixing to obtain a mixed master batch, and scraping by a scraping mechanism simultaneously in the stirring and mixing process;
step three: extruding, namely conveying the mixed master batch obtained in the step two to a double-screw extruder from a feeder to perform melt extrusion granulation to obtain polypropylene resin flame-retardant granules;
step four: drying, namely putting the polypropylene resin flame-retardant granules obtained in the step three into a vacuum dryer for drying treatment;
step five: and (2) preparing a film, namely introducing the fully dried polypropylene resin flame-retardant granules into an extruder, carrying out hot melting extrusion on a hot-melt mixture through a T-shaped die under the action of pressure, calendering and sizing a solution extruded through the T-shaped die through a roller shaft, finally drawing the CPP film through a film making machine at a certain film drawing speed, and simultaneously carrying out edge cutting and glue sealing on the corners of the CPP film.
Further, in the first step, 20 parts of the halogen-free flame retardant and 0.3 part of the anti-dripping agent can be replaced by 15 parts of the halogen-free flame retardant and 0.4 part of the anti-dripping agent.
Further, the method comprises the following steps: in the second step, the rotating speed of the rotating shaft of the high-speed stirrer is 200-280r/min, and the mixing time is 10-20 min.
Furthermore, in the second step, the scraping mechanism comprises a connecting rod and a scraping blade, one end of the connecting rod is connected with the high-speed mixer in a rotating mode, and the scraping blade is connected with the connecting rod and is in contact with the inner wall of the high-speed mixer.
Further, in the third step, the temperature of each zone of the double-screw extruder is 200-300 ℃.
Further, in the fourth step, the working temperature of the vacuum drier is 120-150 ℃, and the drying time of the vacuum drier is 20-35 min.
Further, in the fifth step, the working procedures of the film making machine comprise melt extrusion, calendering, stretching, sizing, edge cutting and glue sealing, rolling, detecting and packaging, wherein the edge cutting and glue sealing is realized by a cutter and a packaging glue.
The invention has the beneficial effects that:
in the mixing process, the inner wall of the high-speed mixer is scraped through the scraping mechanism, so that the mixed master batch adhered to the inner wall of the high-speed mixer can be scraped off, the mixed master batch can be effectively prevented from being accumulated on the inner wall of the high-speed mixer, meanwhile, the neatness of the interior of the high-speed mixer can be increased, and the working efficiency of CPP film preparation is improved;
through the in-process at the membrane of making the side cut glue seal, can cut edge the edge of CPP film, cut off the burr of CPP film edge, seal the glue in the position of cutting edge simultaneously, can improve the aesthetic property and the stability of CPP film.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A CPP film is composed of the following raw materials in parts by weight: 95-98 parts of polypropylene resin, 10-30 parts of halogen-free flame retardant, 0.1-0.5 part of anti-dripping agent, 0.4-0.9 part of heat stabilizer, 0.2-0.7 part of antioxidant and 3-8 parts of aluminum foil filler;
the CPP film comprises the following components in parts by weight: 96 parts of polypropylene resin, 20 parts of halogen-free flame retardant, 0.3 part of anti-dripping agent, 0.5 part of heat stabilizer, 0.4 part of antioxidant and 5 parts of aluminum foil filler;
a production process of a CPP film specifically comprises the following steps:
the method comprises the following steps: proportioning polypropylene resin, a halogen-free flame retardant, an anti-dripping agent, a heat stabilizer, an antioxidant and an aluminum foil filler in a metering ratio of 96 parts, 20 parts, 0.3 part, 0.5 part, 0.4 part and 5 parts;
step two: mixing, namely putting 96 parts of polypropylene resin, 20 parts of halogen-free flame retardant, 0.3 part of anti-dripping agent, 0.5 part of heat stabilizer, 0.4 part of antioxidant and 5 parts of aluminum foil filler into a high-speed mixer for stirring and mixing to obtain a mixed master batch, and scraping by a scraping mechanism simultaneously in the stirring and mixing process;
step three: extruding, namely conveying the mixed master batch obtained in the step two to a double-screw extruder from a feeder to perform melt extrusion granulation to obtain polypropylene resin flame-retardant granules;
step four: drying, namely putting the polypropylene resin flame-retardant granules obtained in the step three into a vacuum dryer for drying treatment;
step five: and (2) preparing a film, namely introducing the fully dried polypropylene resin flame-retardant granules into an extruder, carrying out hot melting extrusion on a hot-melt mixture through a T-shaped die under the action of pressure, calendering and sizing a solution extruded through the T-shaped die through a roller shaft, finally drawing the CPP film through a film making machine at a certain film drawing speed, and simultaneously carrying out edge cutting and glue sealing on the corners of the CPP film.
In the first step, 20 parts of halogen-free flame retardant and 0.3 part of anti-dripping agent can be replaced by 15 parts of halogen-free flame retardant and 0.4 part of anti-dripping agent.
In the second step, the rotating speed of the rotating shaft of the high-speed stirrer is 200-280r/min, and the mixing time is 10-20 min.
And in the second step, the scraping mechanism comprises a connecting rod and a scraping blade, one end of the connecting rod is connected with the high-speed stirrer in a rotating mode, and the scraping blade is connected with the connecting rod and is in contact with the inner wall of the high-speed stirrer.
In the third step, the temperature of each zone of the double-screw extruder is 200-300 ℃.
In the fourth step, the working temperature of the vacuum drier is 120-150 ℃, and the drying time of the vacuum drier is 20-35 min.
And in the fifth step, the working procedures of the film making machine comprise melt extrusion, calendering, stretching, sizing, edge cutting and sealing, rolling, detection and packaging, wherein the edge cutting and sealing are realized by a cutter and packaging glue.
The foregoing is merely exemplary and illustrative of the principles of the present invention and various modifications, additions and substitutions of the specific embodiments described herein may be made by those skilled in the art without departing from the principles of the present invention or exceeding the scope of the claims set forth herein.
Claims (9)
1. A CPP film, comprising: the CPP film is composed of the following raw materials in parts by weight: 95-98 parts of polypropylene resin, 10-30 parts of halogen-free flame retardant, 0.1-0.5 part of anti-dripping agent, 0.4-0.9 part of heat stabilizer, 0.2-0.7 part of antioxidant and 3-8 parts of aluminum foil filler.
2. The CPP film according to claim 1, wherein the CPP film comprises the following components in parts by weight: 96 parts of polypropylene resin, 20 parts of halogen-free flame retardant, 0.3 part of anti-dripping agent, 0.5 part of heat stabilizer, 0.4 part of antioxidant and 5 parts of aluminum foil filler.
3. The production process of the CPP film is characterized by comprising the following steps:
the method comprises the following steps: proportioning polypropylene resin, a halogen-free flame retardant, an anti-dripping agent, a heat stabilizer, an antioxidant and an aluminum foil filler in a metering ratio of 96 parts, 20 parts, 0.3 part, 0.5 part, 0.4 part and 5 parts;
step two: mixing, namely putting 96 parts of polypropylene resin, 20 parts of halogen-free flame retardant, 0.3 part of anti-dripping agent, 0.5 part of heat stabilizer, 0.4 part of antioxidant and 5 parts of aluminum foil filler into a high-speed mixer for stirring and mixing to obtain a mixed master batch, and scraping by a scraping mechanism simultaneously in the stirring and mixing process;
step three: extruding, namely conveying the mixed master batch obtained in the step two to a double-screw extruder from a feeder to perform melt extrusion granulation to obtain polypropylene resin flame-retardant granules;
step four: drying, namely putting the polypropylene resin flame-retardant granules obtained in the step three into a vacuum dryer for drying treatment;
step five: and (2) preparing a film, namely introducing the fully dried polypropylene resin flame-retardant granules into an extruder, carrying out hot melting extrusion on a hot-melt mixture through a T-shaped die under the action of pressure, calendering and sizing a solution extruded through the T-shaped die through a roller shaft, finally drawing the CPP film through a film making machine at a certain film drawing speed, and simultaneously carrying out edge cutting and glue sealing on the corners of the CPP film.
4. The production process of a CPP film as claimed in claim 3, wherein: in the first step, 20 parts of the halogen-free flame retardant and 0.3 part of the anti-dripping agent can be replaced by 15 parts of the halogen-free flame retardant and 0.4 part of the anti-dripping agent.
5. The production process of a CPP film as claimed in claim 3, wherein: in the second step, the rotating speed of the rotating shaft of the high-speed stirrer is 200-280r/min, and the mixing time is 10-20 min.
6. The production process of a CPP film as claimed in claim 3, wherein: in the second step, the scraping mechanism comprises a connecting rod and a scraping blade, one end of the connecting rod is connected with the high-speed stirrer in a rotating mode, and the scraping blade is connected with the connecting rod and is in contact with the inner wall of the high-speed stirrer.
7. The production process of a CPP film as claimed in claim 3, wherein: in the third step, the temperature of each zone of the double-screw extruder is 200-300 ℃.
8. The production process of a CPP film as claimed in claim 3, wherein: in the fourth step, the working temperature of the vacuum drier is 120-150 ℃, and the drying time of the vacuum drier is 20-35 min.
9. The production process of a CPP film as claimed in claim 3, wherein: in the fifth step, the working procedures of the film making machine comprise melt extrusion, calendering, stretching, sizing, edge cutting and sealing, rolling, detection and packaging, wherein the edge cutting and sealing are realized through a cutter and packaging glue.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110577949.8A CN113292790A (en) | 2021-05-26 | 2021-05-26 | CPP film and production process thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110577949.8A CN113292790A (en) | 2021-05-26 | 2021-05-26 | CPP film and production process thereof |
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| CN113292790A true CN113292790A (en) | 2021-08-24 |
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| CN202110577949.8A Pending CN113292790A (en) | 2021-05-26 | 2021-05-26 | CPP film and production process thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114316437A (en) * | 2022-01-07 | 2022-04-12 | 潮州市景程薄膜科技有限公司 | CPP kinking film and production process thereof |
| CN114516970A (en) * | 2022-02-21 | 2022-05-20 | 泉州利昌新材料科技有限公司 | Aluminized cast polypropylene film |
| CN114714639A (en) * | 2022-04-02 | 2022-07-08 | 浙江本源纸塑科技有限公司 | CPP film book cover production process |
| CN116102760A (en) * | 2023-01-14 | 2023-05-12 | 宁波瑞成包装材料有限公司 | Production method of flame-retardant and easily-infiltrated CPP film |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102977462A (en) * | 2012-11-21 | 2013-03-20 | 苏州奥美材料科技有限公司 | Halogen-free flame retardant hydrolysis-resistant polypropylene resin and processing technology of manufacturing film by utilizing same |
| CN104559147A (en) * | 2014-12-16 | 2015-04-29 | 惠州力王佐信科技有限公司 | Anti-dripping smoke-suppression-type environment-friendly heat-conducting material and preparation method thereof |
| CN105536653A (en) * | 2015-12-22 | 2016-05-04 | 江苏瑞安特重型机械有限公司 | A fusing and mixing device for treating high viscosity materials |
-
2021
- 2021-05-26 CN CN202110577949.8A patent/CN113292790A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102977462A (en) * | 2012-11-21 | 2013-03-20 | 苏州奥美材料科技有限公司 | Halogen-free flame retardant hydrolysis-resistant polypropylene resin and processing technology of manufacturing film by utilizing same |
| CN104559147A (en) * | 2014-12-16 | 2015-04-29 | 惠州力王佐信科技有限公司 | Anti-dripping smoke-suppression-type environment-friendly heat-conducting material and preparation method thereof |
| CN105536653A (en) * | 2015-12-22 | 2016-05-04 | 江苏瑞安特重型机械有限公司 | A fusing and mixing device for treating high viscosity materials |
Non-Patent Citations (2)
| Title |
|---|
| 李祖德主编: "《塑料加工技术应用手册》", 31 October 1997, 中国物资出版社 * |
| 温变英主编: "《高分子材料加工》", 30 June 2016, 中国轻工业出版社 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114316437A (en) * | 2022-01-07 | 2022-04-12 | 潮州市景程薄膜科技有限公司 | CPP kinking film and production process thereof |
| CN114516970A (en) * | 2022-02-21 | 2022-05-20 | 泉州利昌新材料科技有限公司 | Aluminized cast polypropylene film |
| CN114714639A (en) * | 2022-04-02 | 2022-07-08 | 浙江本源纸塑科技有限公司 | CPP film book cover production process |
| CN116102760A (en) * | 2023-01-14 | 2023-05-12 | 宁波瑞成包装材料有限公司 | Production method of flame-retardant and easily-infiltrated CPP film |
| CN116102760B (en) * | 2023-01-14 | 2024-09-20 | 宁波瑞成包装材料有限公司 | Production method of flame-retardant and easily-infiltrated CPP film |
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