CN112008997A - Preparation method of polyester heat-shrinkable film - Google Patents
Preparation method of polyester heat-shrinkable film Download PDFInfo
- Publication number
- CN112008997A CN112008997A CN201910462138.6A CN201910462138A CN112008997A CN 112008997 A CN112008997 A CN 112008997A CN 201910462138 A CN201910462138 A CN 201910462138A CN 112008997 A CN112008997 A CN 112008997A
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- China
- Prior art keywords
- polyester
- shrinkable film
- heat
- heating
- raw material
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- 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.)
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Classifications
-
- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2067/00—Use of polyesters or derivatives thereof, as moulding material
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
Abstract
The invention discloses a preparation method of a polyester heat-shrinkable film, which comprises the following steps: s1, drying raw materials: selecting a polyester raw material, and drying the selected polyester raw material; s2, plasticizing and extruding: placing the polyester raw material subjected to drying treatment in the S1 in a single-screw extruder, and performing plasticizing extrusion to form polyester chips; s3, heating and extending: placing the polyester chip formed in the step S2 in a heating stretcher for heating and stretching to a specified size to form a primary polyester heat-shrinkable film; s4, trimming: trimming the primary polyester heat-shrinkable film formed in S3 to form the polyester heat-shrinkable film; the invention has the beneficial effects that: the preparation method of the polyester heat-shrinkable film is simple and easy to operate, and the produced polyester heat-shrinkable film is environment-friendly and non-toxic, has low cost and strong polymerization effect.
Description
Technical Field
The invention relates to a preparation method of a polyester heat-shrinkable film.
Background
It is known that polyvinyl chloride is widely used as a heat shrinkable film for packaging and labeling because of its good heat shrinkability, which satisfies the packaging requirements of various shaped containers, but its photo-thermal stability and its thermal decomposition product contains dioxin, a carcinogenic substance recognized in the medical field, and therefore, some european countries have been prohibited from using PVC materials, especially for packaging foods and medicines, by law. On the other hand, oriented polystyrene films have uniform heat-shrinkable properties and are easily removed from PET bottles for recycling, but they have problems of poor heat resistance and poor printability. Polyester is also widely used because of its good mechanical, optical and printing properties, and when it is used as an outer label of a PET bottle, it can be recycled together with the body of the beverage bottle, eliminating the procedure of peeling the outer label from the bottle body, thus saving the recycling cost and reducing pollution. Due to the advantages, the polyester material is an ideal substitute for PVC heat shrinkable films. Polyethylene terephthalate is a polyester which does not contain halogen, has low cost, is easy to obtain and has quite wide application, but the pure PET film has very low shrinkage which is not more than 30 days and can not meet the requirement of practical application, and in addition, the conventional PET belongs to linear high molecules and has low molecular weight, so that the melt strength is not large enough, the conventional PET can not permeate blown film processing which has low cost and is suitable for mass production, and therefore, the PET needs to be subjected to copolymerization modification to improve the melt strength and the heat shrinkage. However, the existing manufacturing method for preparing the heat-shrinkable film is not favorable for mass production no matter the price of the finished product and the monomer is relatively expensive, and the development of a preparation method for the polyester heat-shrinkable film is a problem to be solved urgently at present.
Disclosure of Invention
The present invention aims to overcome the above-mentioned shortcomings and provide a technical solution to solve the above-mentioned problems.
A preparation method of a polyester heat-shrinkable film comprises the following steps:
s1, drying raw materials: selecting a polyester raw material, and drying the selected polyester raw material;
s2, plasticizing and extruding: placing the polyester raw material subjected to drying treatment in the S1 in a single-screw extruder, and performing plasticizing extrusion to form polyester chips;
s3, heating and extending: placing the polyester chip formed in the step S2 in a heating stretcher for heating and stretching to a specified size to form a primary polyester heat-shrinkable film;
s4, trimming: the primary polyester heat-shrinkable film formed in S3 was trimmed to form the polyester heat-shrinkable film.
As a further scheme of the invention: the polyester raw material is crystalline polyester or copolymerization modified polyester.
As a further scheme of the invention: the internal working temperature of the single screw extruder in S2 was 70-95 ℃.
As a further scheme of the invention: the internal working temperature of the heating stretcher in the S3 is 85-95 ℃.
As a further scheme of the invention: the polyester chip is stretched in at least one direction in a heating stretcher so that the polyester chip becomes 2 to 10 times as original and a primary polyester heat-shrinkable film is formed.
As a further scheme of the invention: the primary polyester heat-shrinkable film formed in S3 was trimmed by a trimmer.
Compared with the prior art, the invention has the beneficial effects that: the preparation method of the polyester heat-shrinkable film is simple and easy to operate, and the produced polyester heat-shrinkable film is environment-friendly and non-toxic, has low cost and strong polymerization effect.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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.
In the embodiment of the invention, the preparation method of the polyester heat shrinkable film comprises the following steps:
s1, drying raw materials: selecting a polyester raw material, and drying the selected polyester raw material;
s2, plasticizing and extruding: placing the polyester raw material subjected to drying treatment in the S1 in a single-screw extruder, and performing plasticizing extrusion to form polyester chips;
s3, heating and extending: placing the polyester chip formed in the step S2 in a heating stretcher for heating and stretching to a specified size to form a primary polyester heat-shrinkable film;
s4, trimming: the primary polyester heat-shrinkable film formed in S3 was trimmed to form the polyester heat-shrinkable film.
The polyester raw material is crystalline polyester or copolymerization modified polyester.
The internal working temperature of the single screw extruder in S2 was 70-95 ℃.
The internal working temperature of the heating stretcher in the S3 is 85-95 ℃.
The polyester chip is stretched in at least one direction in a heating stretcher so that the polyester chip becomes 2 to 10 times as original and a primary polyester heat-shrinkable film is formed.
The primary polyester heat-shrinkable film formed in S3 was trimmed by a trimmer.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (6)
1. A preparation method of a polyester heat-shrinkable film is characterized by comprising the following steps:
s1, drying raw materials: selecting a polyester raw material, and drying the selected polyester raw material;
s2, plasticizing and extruding: placing the polyester raw material subjected to drying treatment in the S1 in a single-screw extruder, and performing plasticizing extrusion to form polyester chips;
s3, heating and extending: placing the polyester chip formed in the step S2 in a heating stretcher for heating and stretching to a specified size to form a primary polyester heat-shrinkable film;
s4, trimming: the primary polyester heat-shrinkable film formed in S3 was trimmed to form the polyester heat-shrinkable film.
2. The method for preparing a polyester heat-shrinkable film according to claim 1, wherein said polyester starting material is a crystalline polyester or a copolymerized modified polyester.
3. The method of claim 1, wherein the single screw extruder of S2 has an internal working temperature of 70 to 95 ℃.
4. The method of claim 1, wherein the internal working temperature of the heat spreader in S3 is 85 to 95 ℃.
5. The method of claim 4, wherein the polyester chip is stretched in at least one direction of a heating stretcher so that the polyester chip becomes 2 to 10 times as original and a primary polyester heat-shrinkable film is formed.
6. The method of claim 5, wherein the preliminary polyester heat-shrinkable film formed in S3 is trimmed by a trimmer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910462138.6A CN112008997A (en) | 2019-05-30 | 2019-05-30 | Preparation method of polyester heat-shrinkable film |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910462138.6A CN112008997A (en) | 2019-05-30 | 2019-05-30 | Preparation method of polyester heat-shrinkable film |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112008997A true CN112008997A (en) | 2020-12-01 |
Family
ID=73501747
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910462138.6A Pending CN112008997A (en) | 2019-05-30 | 2019-05-30 | Preparation method of polyester heat-shrinkable film |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112008997A (en) |
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2019
- 2019-05-30 CN CN201910462138.6A patent/CN112008997A/en active Pending
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20201201 |