CN108384104A - A kind of processing technology of bidirection stretching polyolefine shrink film - Google Patents
A kind of processing technology of bidirection stretching polyolefine shrink film Download PDFInfo
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- CN108384104A CN108384104A CN201810261100.8A CN201810261100A CN108384104A CN 108384104 A CN108384104 A CN 108384104A CN 201810261100 A CN201810261100 A CN 201810261100A CN 108384104 A CN108384104 A CN 108384104A
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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
- 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
- C08J2323/04—Homopolymers or copolymers of ethene
- C08J2323/08—Copolymers of ethene
-
- 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
- C08J2323/14—Copolymers of propene
-
- 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
- C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2423/02—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
- C08J2423/04—Homopolymers or copolymers of ethene
- C08J2423/08—Copolymers of ethene
-
- 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
- C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2423/02—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
- C08J2423/10—Homopolymers or copolymers of propene
- C08J2423/14—Copolymers of propene
-
- 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
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
-
- 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
- C08K3/34—Silicon-containing compounds
-
- 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
- C08K3/34—Silicon-containing compounds
- C08K3/346—Clay
-
- 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
- C08K3/34—Silicon-containing compounds
- C08K3/36—Silica
-
- 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
- C08K7/16—Solid spheres
- C08K7/18—Solid spheres inorganic
- C08K7/20—Glass
Abstract
The invention discloses a kind of processing technologys of bidirection stretching polyolefine shrink film, include mainly following raw material and its weight fraction：LLDPE (linear low density polyethylene) 35-50%, TPP (ternary polymerized polypropylene) 20-40%, PPC (binary copolymerization polypropylene) 15-35%, necessary functional aid such as slipping agent 5-10%, antiblocking agent 10-20%, antistatic agent 5-15% etc..The bidirection stretching polyolefine shrink film of the present invention has excellent results when packing irregular product, have reached International Environmental Protection standard, meet the U.S. and European environment-friendly quality system up to standard, and it is apparent when shrink film is sealed, when contraction, is not easy sudden and violent mouth, and molecular structure is close, product surface is not easy mill flower after packaging, it is not easy to pierce through, performance ductile strength is high, is suitable for industry-by-industry product packaging.
Description
Technical field
The present invention relates to a kind of shrink film technology field, specially a kind of processing of bidirection stretching polyolefine shrink film
Technique.
Background technology
Bidirection stretching polyolefine shrink film, purposes is very extensive, extensive market, and have the advantages that it is environment-protecting and non-poisonous, therefore
By the extensive attention of World Developed Countries, substitution PVC thermal contraction packaging films become the master in heat shrink wrap material substantially
Miscarriage product.The production of China's series of products starts from middle 1990s, domestic at present to have more than ten production lines,
All introducing equipments, total productive capacity are about 20,000 tons.Since China's packing technique and international developed country's presence are certain poor
Away from application is still in the elementary step to three-layer co-extruded series thermal contraction packaging film at home, and application range is also relatively narrow, is only limitted to drink
Material, audio-visual product, instant food and a small amount of daily chemical products minority field.
Currently, there is also the places of some shortcomings for existing shrink film, such as；Existing shrink film is irregular in packaging
Effect is more general when product, cannot reach International Environmental Protection standard, and existing shrink film unobvious when sealing, receive
Sudden and violent mouth is easy when contracting, molecular structure is more open, and product surface is easy by mill flower and pierces through after packaging, shows ductile strength ratio
It is relatively low.
Invention content
The purpose of the present invention is to provide a kind of processing technologys of bidirection stretching polyolefine shrink film, solve background technology
Proposed in the problem of.
To achieve the above object, the present invention provides the following technical solutions：A kind of processing of bidirection stretching polyolefine shrink film
Technique includes mainly following raw material and its weight fraction：LLDPE (linear low density polyethylene) 35-50%, TPP (ternary polymerizations
Polypropylene) 20-40%, PPC (binary copolymerization polypropylene) 15-35%, necessary functional aid such as slipping agent 5-10%, anti-stick
Even agent 10-20%, antistatic agent 5-15% etc..
As a kind of preferred embodiment of the present invention, the slipping agent main ingredient has edible colloid, enzyme preparation and breast
Agent.
As a kind of preferred embodiment of the present invention, the antiblocking agent is broadly divided into organic antiblocking agent and inorganic anti-
Two kinds of adhesion agent, the inorganic antiblocking agent mainly have diatomite, talcum powder, calcium carbonate, synthetic silica and glass micro-
Pearl etc., the grain size of the antiblocking agent is generally at 3-5 μm, and the skin depth of film is about 1 μm.
As a kind of preferred embodiment of the present invention, the antistatic agent is mainly outer spreading type antistatic agent.
As a kind of preferred embodiment of the present invention, the processing technology of the bidirection stretching polyolefine shrink film, system
Steps are as follows for Preparation Method：
A. above-mentioned raw materials are weighed according to parts by weight first；
B. after the completion of waiting for step a, then by the LLDPE weighed (linear low density polyethylene), TPP (ternary polymerized polypropylene),
PPC (binary copolymerization polypropylene) is poured into mixer plus water is mixed；
C. after the completion of waiting for step a, then slipping agent and antiblocking agent be poured into mixer, a certain amount of water is then added and carries out
The raw material mixed, is then poured into extruder and carries out extrusion molding by mixing again；
D. after the completion of waiting for step c, then antistatic agent is allowed to by the methods of coating, spraying or dipping to be attached to contraction membrane material
Surface, it is dry using room temperature or hot-air and form antistatic coating；
E. after the completion of waiting for step d, high shrink film will be finally processed again and carries out flattening trimming, then again receives shrink film
Volume.
As a kind of preferred embodiment of the present invention, the processing technology of the bidirection stretching polyolefine shrink film, institute
The operation for stating coating includes the following steps：
F. cleaned first to shrinking film surface, thoroughly remove surface dirt, grease etc., can with 1% or so neutral detergent
Solution cleans, and needs to be placed in dust free room after cleaning and dry；
G. after the completion of waiting for step f, then match the solution that antistatic agent is made into 0.2~2% concentration by liquid ethyl alcohol, esters or water, solution
Concentration under the premise of ensureing antistatic effect, it is as diluter as possible because highly concentrated solution can be tacky, be easy absorption ash
Dirt；
K. after the completion of waiting for step g, it is that antistatic agent liquid is sprayed in shrink film with spray gun to reuse spray coating method；
H. after the completion of waiting for step k, then processing is dried to shrink film, film layer is made to harden, in 30-40 DEG C of temperature, humidity 60-
Under conditions of 80%, dry 3 hours are taken around, also to be placed under natural environmental condition 5 hours after dry.
As a kind of preferred embodiment of the present invention, the mixer is using stirring, heating integrated machine, when the stirring
Stirring rod use double helix stirring rod, the heater when heating uses high frequency induction heater, the mixer stirring
When motor rotating speed be 1500r/min, the internal temperature of the mixer when heated is 70 DEG C, and time of heating is 10min.
Compared with prior art, beneficial effects of the present invention are as follows：
The bidirection stretching polyolefine shrink film of the present invention has excellent results when packing irregular product, has reached international ring
Guarantor's standard meets the U.S. and European environment-friendly quality system up to standard, and apparent when shrink film seal, and when contraction is not easy cruelly
Mouthful, molecular structure is close, and product surface is not easy mill flower after packaging, is not easy to pierce through, and performance ductile strength is high, is suitable for each row
Industry product packaging.
Description of the drawings
Upon reading the detailed description of non-limiting embodiments with reference to the following drawings, other feature of the invention,
Objects and advantages will become more apparent upon：
Fig. 1 is a kind of flow chart of the processing technology of bidirection stretching polyolefine shrink film of the present invention.
Specific implementation mode
To make the technical means, the creative features, the aims and the efficiencies achieved by the present invention be easy to understand, with reference to
Specific implementation mode, the present invention is further explained.
Referring to Fig. 1, the present invention provides a kind of technical solution：A kind of processing technology of bidirection stretching polyolefine shrink film,
Include mainly following raw material and its weight fraction：LLDPE (linear low density polyethylene) 35-50%, TPP (ternary polymerizations poly- third
Alkene) 20-40%, PPC (binary copolymerization polypropylene) 15-35%, necessary functional aid such as slipping agent 5-10%, antiblocking agent
10-20%, antistatic agent 5-15% etc..
The slipping agent main ingredient has edible colloid, enzyme preparation and emulsifier.
The antiblocking agent is broadly divided into two kinds of organic antiblocking agent and inorganic antiblocking agent, the inorganic antiblocking agent master
There are diatomite, talcum powder, calcium carbonate, synthetic silica and glass microballoon etc., the grain size of the antiblocking agent generally to exist
3-5 μm, and the skin depth of film is about 1 μm.
The antistatic agent is mainly outer spreading type antistatic agent.
The processing technology of the bidirection stretching polyolefine shrink film, steps are as follows for preparation method：
A. above-mentioned raw materials are weighed according to parts by weight first；
B. after the completion of waiting for step a, then by the LLDPE weighed (linear low density polyethylene), TPP (ternary polymerized polypropylene),
PPC (binary copolymerization polypropylene) is poured into mixer plus water is mixed；
C. after the completion of waiting for step a, then slipping agent and antiblocking agent be poured into mixer, a certain amount of water is then added and carries out
The raw material mixed, is then poured into extruder and carries out extrusion molding by mixing again；
D. after the completion of waiting for step c, then antistatic agent is allowed to by the methods of coating, spraying or dipping to be attached to contraction membrane material
Surface, it is dry using room temperature or hot-air and form antistatic coating；
E. after the completion of waiting for step d, high shrink film will be finally processed again and carries out flattening trimming, then again receives shrink film
Volume.
The processing technology of the bidirection stretching polyolefine shrink film, the operation of the coating include the following steps：
F. cleaned first to shrinking film surface, thoroughly remove surface dirt, grease etc., can with 1% or so neutral detergent
Solution cleans, and needs to be placed in dust free room after cleaning and dry；
G. after the completion of waiting for step f, then match the solution that antistatic agent is made into 0.2~2% concentration by liquid ethyl alcohol, esters or water, solution
Concentration under the premise of ensureing antistatic effect, it is as diluter as possible because highly concentrated solution can be tacky, be easy absorption ash
Dirt；
K. after the completion of waiting for step g, it is that antistatic agent liquid is sprayed in shrink film with spray gun to reuse spray coating method；
H. after the completion of waiting for step k, then processing is dried to shrink film, film layer is made to harden, in 30-40 DEG C of temperature, humidity 60-
Under conditions of 80%, dry 3 hours are taken around, also to be placed under natural environmental condition 5 hours after dry.
Using stirring, heating integrated machine, the stirring rod when stirring uses double helix stirring rod, described for the mixer
Heater when heating uses high frequency induction heater, and the rotating speed of motor is 1500r/min when the mixer stirs, described mixed
The internal temperature of clutch when heated is 70 DEG C, and the time of heating is 10min.
First by above-mentioned raw materials according to parts by weight when bidirection stretching polyolefine shrink film and its processing technology use
Number weighs, then (binary copolymerization is poly- by the LLDPE weighed (linear low density polyethylene), TPP (ternary polymerized polypropylene), PPC
Propylene) it is poured into mixer plus water is mixed, then slipping agent and antiblocking agent are poured into mixer, then it is added one
Quantitative water is mixed, and then the raw material mixed is poured into extruder again and carries out extrusion molding, then by antistatic agent
It is allowed to be attached to the surface for shrinking membrane material by the methods of coating, spraying or dipping, using room temperature or hot-air drying
Antistatic coating is formed, high shrink film will be finally processed again and carries out flattening trimming, then again wind shrink film.
The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention, for this field skill
For art personnel, it is clear that invention is not limited to the details of the above exemplary embodiments, and without departing substantially from the present invention spirit or
In the case of essential characteristic, the present invention can be realized in other specific forms.Therefore, in all respects, should all incite somebody to action
Embodiment regards exemplary as, and is non-limiting, the scope of the present invention by appended claims rather than on state
Bright restriction, it is intended that including all changes that come within the meaning and range of equivalency of the claims in the present invention
It is interior.Any reference signs in the claims should not be construed as limiting the involved claims.
In addition, it should be understood that although this specification is described in terms of embodiments, but not each embodiment is only wrapped
Containing an independent technical solution, this description of the specification is merely for the sake of clarity, and those skilled in the art should
It considers the specification as a whole, the technical solutions in the various embodiments may also be suitably combined, forms those skilled in the art
The other embodiment being appreciated that.
Claims (7)
1. a kind of processing technology of bidirection stretching polyolefine shrink film, it is characterised in that：Include mainly following raw material and its weight
Score：(binary copolymerization is poly- by LLDPE (linear low density polyethylene) 35-50%, TPP (ternary polymerized polypropylene) 20-40%, PPC
Propylene) 15-35%, necessary functional aid such as slipping agent 5-10%, antiblocking agent 10-20%, antistatic agent 5-15% etc..
2. a kind of processing technology of bidirection stretching polyolefine shrink film according to claim 1, it is characterised in that：It is described refreshing
Lubrication prescription main ingredient has edible colloid, enzyme preparation and emulsifier.
3. a kind of processing technology of bidirection stretching polyolefine shrink film according to claim 1, it is characterised in that：It is described
Antiblocking agent is broadly divided into two kinds of organic antiblocking agent and inorganic antiblocking agent, the inorganic antiblocking agent mainly have diatomite,
Talcum powder, calcium carbonate, synthetic silica and glass microballoon etc., the grain size of the antiblocking agent are and thin generally at 3-5 μm
The skin depth of film is about 1 μm.
4. a kind of processing technology of bidirection stretching polyolefine shrink film according to claim 1, it is characterised in that：It is described anti-
Electrostatic agent is mainly outer spreading type antistatic agent.
5. the processing technology of the bidirection stretching polyolefine shrink film according to Claims 1-4, it is characterised in that：Preparation side
Steps are as follows for method：
A. above-mentioned raw materials are weighed according to parts by weight first；
B. after the completion of waiting for step a, then by the LLDPE weighed (linear low density polyethylene), TPP (ternary polymerized polypropylene),
PPC (binary copolymerization polypropylene) is poured into mixer plus water is mixed；
C. after the completion of waiting for step a, then slipping agent and antiblocking agent be poured into mixer, a certain amount of water is then added and carries out
The raw material mixed, is then poured into extruder and carries out extrusion molding by mixing again；
D. after the completion of waiting for step c, then antistatic agent is allowed to by the methods of coating, spraying or dipping to be attached to contraction membrane material
Surface, it is dry using room temperature or hot-air and form antistatic coating；
E. after the completion of waiting for step d, high shrink film will be finally processed again and carries out flattening trimming, then again receives shrink film
Volume.
6. the processing technology of bidirection stretching polyolefine shrink film according to claim 5, it is characterised in that：The coating
Operation includes the following steps：
F. cleaned first to shrinking film surface, thoroughly remove surface dirt, grease etc., can with 1% or so neutral detergent
Solution cleans, and needs to be placed in dust free room after cleaning and dry；
G. after the completion of waiting for step f, then match the solution that antistatic agent is made into 0.2~2% concentration by liquid ethyl alcohol, esters or water, solution
Concentration under the premise of ensureing antistatic effect, it is as diluter as possible because highly concentrated solution can be tacky, be easy absorption ash
Dirt；
K. after the completion of waiting for step g, it is that antistatic agent liquid is sprayed in shrink film with spray gun to reuse spray coating method；
H. after the completion of waiting for step k, then processing is dried to shrink film, film layer is made to harden, in 30-40 DEG C of temperature, humidity 60-
Under conditions of 80%, dry 3 hours are taken around, also to be placed under natural environmental condition 5 hours after dry.
7. a kind of processing technology of bidirection stretching polyolefine shrink film according to claim 5, it is characterised in that：It is described mixed
For clutch using stirring, heating integrated machine, the stirring rod when stirring uses double helix stirring rod, the heater when heating
Using high frequency induction heater, the rotating speed of motor is 1500r/min when mixer stirring, and the mixer is when heated
Internal temperature is 70 DEG C, and the time of heating is 10min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810261100.8A CN108384104A (en) | 2018-03-28 | 2018-03-28 | A kind of processing technology of bidirection stretching polyolefine shrink film |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810261100.8A CN108384104A (en) | 2018-03-28 | 2018-03-28 | A kind of processing technology of bidirection stretching polyolefine shrink film |
Publications (1)
| Publication Number | Publication Date |
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| CN108384104A true CN108384104A (en) | 2018-08-10 |
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ID=63072320
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| CN201810261100.8A Pending CN108384104A (en) | 2018-03-28 | 2018-03-28 | A kind of processing technology of bidirection stretching polyolefine shrink film |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109911362A (en) * | 2019-03-11 | 2019-06-21 | 中粮包装（昆山）有限公司 | A kind of steel plastic compount opening steel drum and its assembly technology |
| CN114905729A (en) * | 2022-05-25 | 2022-08-16 | 孔繁周 | Method for manufacturing special functional shrink film for flame spray gun |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106146871A (en) * | 2016-08-05 | 2016-11-23 | 广东正业科技股份有限公司 | A kind of anti-static sheet and preparation method thereof |
| CN106554546A (en) * | 2015-09-28 | 2017-04-05 | 中国石油化工股份有限公司 | A kind of polyethylene composition and antistatic film |
-
2018
- 2018-03-28 CN CN201810261100.8A patent/CN108384104A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106554546A (en) * | 2015-09-28 | 2017-04-05 | 中国石油化工股份有限公司 | A kind of polyethylene composition and antistatic film |
| CN106146871A (en) * | 2016-08-05 | 2016-11-23 | 广东正业科技股份有限公司 | A kind of anti-static sheet and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 林振清 等主编, 西安电子科技大学出版社 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109911362A (en) * | 2019-03-11 | 2019-06-21 | 中粮包装（昆山）有限公司 | A kind of steel plastic compount opening steel drum and its assembly technology |
| CN114905729A (en) * | 2022-05-25 | 2022-08-16 | 孔繁周 | Method for manufacturing special functional shrink film for flame spray gun |
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