CN114507404A - Low-shrinkage cold-resistant PVC heat-shrinkable label film and preparation method thereof - Google Patents
Low-shrinkage cold-resistant PVC heat-shrinkable label film and preparation method thereof Download PDFInfo
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
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- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F218/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an acyloxy radical of a saturated carboxylic acid, of carbonic acid or of a haloformic acid
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- C08J2327/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers
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- C08J2327/04—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment containing chlorine atoms
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- C08J2431/00—Characterised by the use of copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an acyloxy radical of a saturated carboxylic acid, or carbonic acid, or of a haloformic acid
- C08J2431/02—Characterised by the use of omopolymers or copolymers of esters of monocarboxylic acids
- C08J2431/04—Homopolymers or copolymers of vinyl acetate
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Abstract
The invention belongs to the technical field of high polymer material processing, and particularly relates to a low-shrinkage cold-resistant PVC heat-shrinkable label film and a preparation method thereof. The invention provides a preparation method of a low-shrinkage cold-resistant PVC heat-shrinkable label film, which comprises the steps of preparing an interpenetrating network core-shell structure PVC cold-resistant toughening agent by polymerizing vinyl acetate, ethyl acrylate and methyl methacrylate through emulsion seeds, applying the cold-resistant toughening agent to a PVC heat-shrinkable label film formula system, and kneading (mixing) and film blowing molding to prepare the low-shrinkage cold-resistant PVC heat-shrinkable label film. The invention not only maintains the shrinkage performance and stiffness of the PVC heat-shrinkable label film unchanged, but also has good cold resistance, flexibility and rebound resilience, and better plasticizing performance.
Description
Technical Field
The invention belongs to the technical field of high polymer material processing, and particularly relates to a low-shrinkage cold-resistant PVC heat-shrinkable label film and a preparation method thereof.
Background
The PVC heat-shrinkable label can endow bottled beverage and purified water with a 360-degree label design, and a packaging effect with strong visual impact is formed by printing exquisite patterns and gorgeous colors, so that the perfect image and attraction of commodities on a supermarket shelf are highlighted, and brand differentiation design and marketing are facilitated. Due to good performance and excellent cost performance, the PVC material becomes one of the main label forms of the current bottled drink. With the consumption of the beverage after 90 and 00, the beverage is not only faster in updating, but also various novel designs are developed, which puts forward higher performance requirements on the packaging and labels of the beverage, the requirements on low-temperature refrigeration and freezing of the beverage require the packaging and labels to have good cold resistance, the packaging bottle is thinned and specialized, and has lower requirements on the shrinkage force of the shrinkage label, so that the problem that the bottle body is deformed (the appearance design effect cannot be achieved) and the effective volume is reduced due to higher shrinkage force of the shrinkage label is avoided. The development of bottled packaging of dairy products, particularly yoghourt, further exacerbates the performance requirements of low shrinkage force and high cold resistance of the shrink label film.
The shrinkage force of the PVC heat-shrinkable label film is lower than that of a PET (G) film, so that the PVC heat-shrinkable label film can meet the requirement of the shrinkage force of most bottled drinks, but the PVC heat-shrinkable label film has higher shrinkage force than that of an OPS label film, and needs to be further reduced when the PVC heat-shrinkable label film is used for packaging some ultra-thin bottles. The PVC material has relatively poor cold resistance and low-temperature impact strength, and the lower limit of the service temperature of the hard PVC is generally-15 ℃. The PVC heat-shrinkable label film belongs to a hard PVC product, although a certain amount of toughening components are added in the formula components, some labels still have frost cracking phenomenon in drinks, and for the drinks needing low-temperature preservation or freezing treatment, the crack mark damage rate of the common PVC heat-shrinkable label generated due to low temperature is higher.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a low-shrinkage cold-resistant PVC heat-shrinkable label film and a preparation method thereof, aiming at solving the technical problems that the PVC material has relatively poor cold resistance and low-temperature impact strength, and the common PVC heat-shrinkable label has high crack damage rate caused by low temperature for drinks needing low-temperature preservation or freezing treatment.
The invention provides a low-shrinkage cold-resistant PVC heat-shrinkable label film, which has the following specific technical scheme:
the low-shrinkage cold-resistant PVC heat-shrinkable label film comprises PVC resin, a heat stabilizer, a plasticizer, a cold-resistant toughening agent, a processing aid, an internal lubricant and an external lubricant, wherein the cold-resistant toughening agent is an interpenetrating network core-shell structure, the molar ratio of a core to a shell is 3:1-4:1, the core is a copolymer of vinyl acetate and ethyl acrylate, and the shell is polymethyl methacrylate.
In certain embodiments, the molar ratio of vinyl acetate to ethyl acrylate is (50-60) to (40-50).
In certain embodiments, the following are in parts by mass: 100 parts of PVC resin, 2 parts of heat stabilizer, 2-3 parts of plasticizer, 8-10 parts of cold-resistant toughening agent, 1.0-1.2 parts of processing aid, 0.5-0.7 part of internal lubricant and 0.2-0.3 part of external lubricant.
The invention provides another technical scheme, and relates to a preparation method of a low-shrinkage cold-resistant PVC heat-shrinkable label film, which is used for preparing the low-shrinkage cold-resistant PVC heat-shrinkable label film.
In certain embodiments, the cold-resistant toughener is prepared as follows:
1) adding deionized water and an emulsifier into a reactor, heating and stirring, and completely dissolving at 65 ℃;
2) mixing vinyl acetate and ethyl acrylate according to a ratio to obtain a monomer mixed solution;
3) 1/3 of the monomer mixed solution in the step 2) is added into a reactor for pre-emulsification for 30 minutes;
4) adding 40% of initiator solution to initiate polymerization reaction, stabilizing the pH value of the reaction system to 6-7.5 after the condenser does not obviously reflux, dropwise adding the residual monomer solution and 45% of initiator solution at the dropping speed of 0.8-1.0ml/min, and after dropwise adding, preserving heat and curing for 30 minutes;
5) adding a cross-linking agent and the rest 15 percent of initiator solution, heating to 70-75 ℃, dropwise adding methyl methacrylate monomer into the reaction system at the dropping speed of 0.7-0.9ml/min, heating to 80-85 ℃ after dropwise adding, and reacting for 1.5 hours;
6) after the reaction is finished, performing demulsification treatment by using a calcium chloride solution, filtering, washing to be neutral, drying in an oven at 50-60 ℃ for 6-8 hours, and cooling to room temperature to obtain the cold-resistant toughening agent.
Further, the amount of the cross-linking agent is 0.8-1.0% of methyl methacrylate, and the cross-linking agent is triallyl isocyanurate or diallyl phthalate.
Further, the mass ratio of the emulsifier to the total amount of vinyl acetate, ethyl acrylate and methyl methacrylate monomers is 1-3%, the emulsifier is a mixture of an anionic emulsifier and a nonionic emulsifier, and the mass ratio of the anionic emulsifier to the nonionic emulsifier is 1: 3.
Further, the mass ratio of the using amount of the initiator to the total amount of the vinyl acetate, the ethyl acrylate and the methyl methacrylate monomers is 0.16-0.20%, and the initiator is ammonium persulfate or potassium persulfate.
In certain embodiments, the mixing comprises the steps of:
s1, adding PVC resin, a stabilizer and a plasticizer in the rotating process of the high-speed mixer;
s2, adding a processing aid, a cold-resistant toughening agent and an internal lubricant when the temperature of the quick mixer is raised to 75-80 ℃;
s3, adding an external lubricant when the temperature of the high-speed mixer is raised to 95-100 ℃;
and S4, when the temperature of the high-speed mixer rises to 125 ℃, putting the high-temperature mixture into a cooling mixer, stirring and cooling, and discharging when the temperature of the cooling mixer is below 45 ℃.
In certain embodiments, the extruder is a single screw extruder with a screw diameter of 65mm, a screw length to diameter ratio of 29.5:1, a compression ratio of 2.8: 1; extruder temperature: 135-145 ℃, 145-155 ℃, 155-165 ℃, 175-185 ℃, 175-180 ℃, and the temperature of the connecting section: 175-180 ℃; temperature of the die: 185 ℃ to 195 ℃, 190 ℃ to 200 ℃, and the water bath heating temperature is 78-81 ℃; the diameter of the mouth mold of the film blowing mold is 130mm, the gap of the mouth mold is 0.8mm, and the double-air-port air ring is arranged.
The invention has the following beneficial effects: the invention provides a preparation method of a low-shrinkage cold-resistant PVC heat-shrinkable label film, which is characterized in that vinyl acetate, ethyl acrylate and methyl methacrylate are polymerized through emulsion seeds to prepare a PVC cold-resistant toughening agent with an interpenetrating network core-shell structure, the cold-resistant toughening agent is applied to a PVC heat-shrinkable label film formula system, and the low-shrinkage cold-resistant PVC heat-shrinkable label film is prepared through kneading (mixing) and film blowing molding. The copolymer of vinyl acetate and ethyl acrylate, which is a flexible monomer with good cold resistance, is used as a core, the copolymer has good cold resistance, flexibility and rebound resilience, and also has good plasticizing performance, so that the shrinkage performance and stiffness of the PVC heat shrinkage label film are prevented from being changed excessively to influence the normal use of the label film, PMMA (polymethyl methacrylate) is used as a shell, the solubility parameter of PMMA is similar to that of PVC, the interface action of a cold-resistant toughening agent and two phases of PVC can be enhanced, the PVC has good compatibility with the PVC, the copolymer core which plays a main role is uniformly dispersed into a PVC system, and the efficiency of the PVC system is exerted to the maximum extent. The PVC heat-shrinkable label film belongs to a hard product, does not contain filler, is a transparent film product, and does not bring negative influence on the transparency and hue of the PVC film when used.
Drawings
FIG. 1 is a flow chart of the preparation of the cold resistant toughening agent of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings 1 in conjunction with specific embodiments.
Preparation of cold-resistant toughening agent
1. Raw material composition and proportion
(1) The PVC cold-resistant toughening agent is an interpenetrating network core-shell structure
Core-shell ratio of 3:1 to 4:1 (molar ratio), core: vinyl acetate and ethyl acrylate copolymer, the molar ratio of the two is 50-60: 40-50; shell: polymethyl methacrylate (PMMA).
(2) Crosslinking agent
The cross-linking agent is used to form a certain interpenetrating network structure between the core and the shell, so that the PMMA on the shell and the vinyl acetate/ethyl acrylate copolymer on the core are combined more tightly, the molecular chain segment structure of the copolymer on the core is conveniently and better fused into a PVC molecular system in the forming process of the PVC heat shrinkage film, and the effects of cold resistance and toughening (shrinkage force reduction) of the PVC heat shrinkage film are better exerted. The crosslinking agent can be triallyl isocyanurate (TAIC), diallyl phthalate, etc. Triallyl isocyanurate (TAIC) was used in the examples in an amount of 0.8 to 1.0% based on methyl methacrylate.
(3) Emulsifier
An anionic and nonionic sharing mode is adopted, and the ratio of the anionic to nonionic sharing mode is 1:3 (mass ratio), wherein the anionic emulsifier is alkyl anionic emulsifier, sodium dodecyl sulfate is adopted in the embodiment, polyoxyethylene alkyl ether is adopted in the non-ionic emulsifier, OP-10 and nonylphenol polyoxyethylene ether are adopted in the embodiment, and the addition amount of the emulsifier is 1-3% (mass ratio to the total amount of the monomers).
(3) Initiator
Ammonium persulfate and potassium persulfate can be selected, and the ammonium persulfate is adopted in the embodiment. The amount is 0.16-0.20% (mass ratio to the total amount of monomers).
(4) Buffer solution
15% sodium bicarbonate aqueous solution (parts by mass)
(5) Demulsifier
20% calcium chloride aqueous solution (parts by mass)
2. Synthesis procedure (four-necked flask was used as a reactor, and a reflux condenser, a stirrer, a thermometer, etc. were attached to the flask)
1) Adding a proper amount of deionized water and an emulsifier into a reactor, heating and stirring, and completely dissolving at 65 ℃;
2) mixing vinyl acetate and ethyl acrylate according to a ratio for later use;
3) 1/3 of the prepared 2) monomer mixed solution is added into a reactor for pre-emulsification for 30 minutes;
4) adding 40% of initiator solution (dissolved into solution by deionized water in advance), initiating polymerization reaction, adding a certain amount of sodium bicarbonate buffer solution after the condenser does not obviously reflux, stabilizing the pH value of the reaction system at 6-7.5, improving the stability of the emulsion, and enabling the structural form of the inner core colloidal particles to be uniform and consistent. The remaining monomer and 45% initiator solution were added dropwise at a rate of 0.8-1.0 ml/min. After the dropwise addition, the mixture is subjected to heat preservation and curing reaction for 30 minutes.
5) Adding a cross-linking agent and the rest 15 percent of initiator solution, heating to 70-75 ℃, dropwise adding methyl methacrylate monomer into the reaction system at the dropping speed of 0.7-0.9ml/min, heating to 80-85 ℃ after dropwise adding, and reacting for 1.5 hours.
6) After the reaction is finished, performing demulsification treatment by using a calcium chloride solution, filtering, washing to be neutral, drying in an oven at 50-60 ℃ for 6-8 hours, and cooling to room temperature to obtain the cold-resistant toughening agent.
Preparation of low-shrinkage cold-resistant PVC heat shrinkage film
1. Formulation of
The specific embodiment is as follows:
| formulation ofMiddle component | Example 1 | Example 2 | Example 3 | Example 4 | Example 5 |
| PVC resin SG-3 | 100 | 100 | 100 | 100 | 100 |
| Methyl tin mercaptide 181 | 2 | 2 | 2 | 2 | 2 |
| |
3 | 3 | 3 | 2 | 2.5 |
| |
1 | 1 | 1 | 1.1 | 1.2 |
| Self-made cold-resistant toughening agent | 8 | 9 | 10 | 9 | 10 |
| RGH-4 | 0.5 | 0.5 | 0.5 | 0.6 | 0.7 |
| AC-316A | 0.2 | 0.2 | 0.2 | 0.25 | 0.3 |
The self-made cold-resistant toughening agent is adopted, and the formula which meets the service performance requirements of the low-shrinkage cold-resistant heat-shrinkable label film and the PVC two-bubble inflation molding mode is designed.
Specifically, SG-2 or SG-3 type suspension PVC resin with good cold resistance and larger molecular weight is selected as the PVC resin to replace SG-5 type PVC resin commonly used in the formula of the common PVC heat-shrinkable label film; the plasticizer selects dioctyl sebacate (DOS) with excellent cold resistance to replace dioctyl phthalate (DOP) commonly used in the formula of the common PVC heat-shrinkable label film.
The home-made cold-resistant toughening agent is used for replacing a commonly used toughening agent MBS in a common PVC heat-shrinkable label film formula, and the proportion of the MBS is properly improved. The amount of the self-made cold-resistant toughening agent is increased, so that the cold resistance and toughness of the PVC heat shrinkable film can be effectively improved, the contractility of the shrink film is reduced, and the processability of the PVC shrink film can be improved (the cold-resistant toughening agent and the processing aid ACR have similar structural composition), so that the amounts of the processing aid, the plasticizer and other aids in the formula of the PVC shrink film can be reduced, and the cold resistance of PVC products is further improved.
The formulations of the cold-resistant tougheners used in examples 1-3 were:
PVC cold-resistant toughening agent
And (3) nucleus: vinyl acetate and ethyl acrylate copolymer, wherein the molar ratio of the vinyl acetate to the ethyl acrylate is 60: 40;
shell: polymethyl methacrylate;
core-shell ratio of 4:1 (molar ratio)
A crosslinking agent: triallyl isocyanurate (TAIC) in an amount of 0.8% (MMA: weight ratio)
Emulsifier: sodium dodecyl sulfate (OP-10), the proportion of the two is 1:3 (mass ratio) and an addition amount of 2% (mass ratio to the total amount of monomers)
Initiator: ammonium persulfate in an amount of 0.18% (mass ratio to the total amount of monomers)
2. Kneading (mixing) process
The components in the formula are mixed into a uniform dry mixture in a form of matching a high-speed mixer and a cooling (low-speed) mixer.
Sequence of addition during mixing
Firstly, adding PVC resin, a stabilizer and a plasticizer in the rotating process of a high-speed mixer;
secondly, when the temperature of the high-speed mixer is increased to 75-80 ℃, adding a cold-resistant toughening agent, a processing aid and an internal lubricant;
thirdly, when the temperature of the high-speed mixer is increased to 95-100 ℃, adding an external lubricant;
fourthly, when the temperature of the high-speed mixer rises to about 125 ℃, the mixture is put into a cooling mixer to be stirred and cooled;
cooling the mixer to 45 deg.c and discharging for further use.
3. Blow molding heat shrinkable film
The same equipment and process as those of the common PVC heat-shrinkable label film are adopted.
The equipment uses a PVC thermal contraction label film forming machine set which is formed by secondary blow molding and is rotated by a film blowing machine head and heated by two-bubble water bath.
The process flow comprises the following steps: dry mixing, extruder plasticizing, film blowing head forming, water bath heating, secondary blowing, cooling and forming, curling, slitting, packaging and obtaining finished products.
Extrusion and film blowing:
equipment: the single-screw extruder has a screw diameter of 65mm, a screw length-diameter ratio of 29.5:1 and a compression ratio of 2.8: 1.
The diameter of a mouth mold of the film blowing mold is 130mm, the gap of the mouth mold is 0.8mm, and the double-air-port air ring is arranged.
Extruder temperature: 135 ℃ 145 ℃ 155 ℃ 165 ℃ 175 ℃ 185 ℃ 175 ℃ 180 ℃. Temperature of the connection section: 175 ℃ and 180 ℃. The temperature of the mold is 185-195 ℃ and 190-200 ℃. The heating temperature of the water bath is 77-79 ℃.
4. Low shrinkage cold resistant PVC heat shrink label film example related properties
TABLE 1 Low shrinkage cold-resistant PVC heat-shrinkable label film Properties
As can be seen from table 1, the shrinkage rate and the light transmittance of the low-shrinkage cold-resistant PVC heat-shrinkable label film prepared by the method of the present invention can be maintained at the same level as those of the common PVC heat-shrinkable label film, and the tensile strength and the elongation at break are significantly superior to those of the common PVC heat-shrinkable label film; in low temperature testing, the cracking rate is obviously lower than that of the common PVC heat shrinkable label film.
The above description is only for the purpose of illustrating preferred embodiments of the present invention and is not to be construed as limiting the invention, and the present invention is not limited to the above examples, and those skilled in the art should also be able to make various changes, modifications, additions or substitutions within the spirit and scope of the present invention.
Claims (10)
1. The low-shrinkage cold-resistant PVC heat-shrinkable label film is characterized by comprising the following components: the PVC composite material comprises PVC resin, a heat stabilizer, a plasticizer, a cold-resistant toughening agent, a processing aid, an internal lubricant and an external lubricant, wherein the cold-resistant toughening agent is of an interpenetrating network core-shell structure, the molar ratio of a core to a shell is 3:1-4:1, the core is a copolymer of vinyl acetate and ethyl acrylate, and the shell is polymethyl methacrylate.
2. The low shrinkage force and cold resistant PVC heat shrinkable label film of claim 1, wherein the molar ratio of vinyl acetate to ethyl acrylate is (50-60) to (40-50).
3. The low-shrink cold-resistant PVC heat-shrinkable label film according to claim 1, characterized in that: 100 parts of PVC resin, 2 parts of heat stabilizer, 2-3 parts of plasticizer, 8-10 parts of cold-resistant toughening agent, 1.0-1.2 parts of processing aid, 0.5-0.7 part of internal lubricant and 0.2-0.3 part of external lubricant.
4. A preparation method of a low-shrinkage cold-resistant PVC heat-shrinkable label film, which is used for preparing the PVC heat-shrinkable label film as claimed in any one of claims 1 to 3, and is characterized in that PVC resin, a heat stabilizer, a plasticizer, a cold-resistant toughening agent, a processing aid, an internal lubricant and an external lubricant are mixed, and are subjected to plasticizing by an extruder, forming by a film blowing machine head, water bath heating, secondary blowing, cooling and shaping to obtain the low-shrinkage cold-resistant PVC heat-shrinkable label film.
5. The preparation method of the low-contractility cold-resistant PVC heat-shrinkable label film according to claim 4, wherein the preparation method of the cold-resistant toughening agent is as follows:
1) adding deionized water and an emulsifier into a reactor, heating and stirring, and completely dissolving at 65 ℃;
2) mixing vinyl acetate and ethyl acrylate according to a ratio to obtain a monomer mixed solution;
3) 1/3 of the monomer mixed solution in the step 2) is added into a reactor for pre-emulsification for 30 minutes;
4) adding 40% of initiator solution to initiate polymerization reaction, stabilizing the pH value of the reaction system to 6-7.5 after the condenser does not have obvious reflux, dropwise adding the residual monomer solution and 45% of initiator solution at the speed of 0.8-1.0ml/min, and after dropwise adding, preserving heat and curing for 30 minutes;
5) adding a cross-linking agent and the rest 15 percent of initiator solution, heating to 70-75 ℃, dropwise adding methyl methacrylate monomer into the reaction system at the dropping speed of 0.7-0.9ml/min, heating to 80-85 ℃ after dropwise adding, and reacting for 1.5 hours;
6) after the reaction is finished, performing demulsification treatment by using a calcium chloride solution, filtering, washing to be neutral, drying in an oven at 50-60 ℃ for 6-8 hours, and cooling to room temperature to obtain the cold-resistant toughening agent.
6. The method for preparing the low-shrinkage cold-resistant PVC heat-shrinkable label film according to claim 5, wherein the amount of the cross-linking agent is 0.8-1.0% of methyl methacrylate, and the cross-linking agent is triallyl isocyanurate or diallyl phthalate.
7. The method for preparing the low-contractility cold-resistant PVC heat-shrinkable label film according to claim 5, wherein the mass ratio of the emulsifier to the total amount of vinyl acetate, ethyl acrylate and methyl methacrylate monomers is 1-3%, the emulsifier is a mixture of an anionic emulsifier and a nonionic emulsifier, and the mass ratio of the anionic emulsifier to the nonionic emulsifier is 1: 3.
8. The preparation method of the low-contractility cold-resistant PVC heat-shrinkable label film according to claim 5, wherein the mass ratio of the amount of the initiator to the total amount of the vinyl acetate, ethyl acrylate and methyl methacrylate monomers is 0.16-0.20%, and the initiator is ammonium persulfate or potassium persulfate.
9. The method for preparing the low-shrinkage cold-resistant PVC heat-shrinkable label film according to claim 4, wherein the mixing comprises the steps of:
s1, adding PVC resin, a stabilizer and a plasticizer in the rotating process of the high-speed mixer;
s2, adding a processing aid, a cold-resistant toughening agent and an internal lubricant when the temperature of the quick mixer is raised to 75-80 ℃;
s3, adding an external lubricant when the temperature of the high-speed mixer is raised to 95-100 ℃;
and S4, when the temperature of the high-speed mixer rises to 125 ℃, putting the high-temperature mixture into a cooling mixer, stirring and cooling, and discharging when the temperature of the cooling mixer is below 45 ℃.
10. The preparation method of the low-shrinkage cold-resistant PVC heat-shrinkable label film as claimed in claim 4, wherein the extruder is a single-screw extruder, the diameter of the screw is 65mm, the length-diameter ratio of the screw is 29.5:1, and the compression ratio is 2.8: 1; extruder temperature: 135-145 ℃, 145-155 ℃, 155-165 ℃, 175-185 ℃, 175-180 ℃, and the temperature of the connecting section: 175-180 ℃; temperature of the die: 185 ℃ to 195 ℃, 190 ℃ to 200 ℃, and the water bath heating temperature is 78-81 ℃; the diameter of the mouth mold of the film blowing mold is 130mm, the gap of the mouth mold is 0.8mm, and the double-air-port air ring is arranged.
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| CN202210281783.XA CN114507404B (en) | 2022-03-22 | 2022-03-22 | Cold-resistant PVC (polyvinyl chloride) heat-shrinkable label film with low shrinkage force and preparation method thereof |
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