CN109166451B - Method for manufacturing high-transparency in-mold label for PET injection molding - Google Patents
Method for manufacturing high-transparency in-mold label for PET injection molding Download PDFInfo
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- CN109166451B CN109166451B CN201810755977.2A CN201810755977A CN109166451B CN 109166451 B CN109166451 B CN 109166451B CN 201810755977 A CN201810755977 A CN 201810755977A CN 109166451 B CN109166451 B CN 109166451B
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- pet
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F3/00—Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps
- G09F3/02—Forms or constructions
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- 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
- B29C45/14688—Coating articles provided with a decoration
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F3/00—Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps
- G09F3/08—Fastening or securing by means not forming part of the material of the label itself
- G09F3/10—Fastening or securing by means not forming part of the material of the label itself by an adhesive layer
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F3/00—Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps
- G09F3/02—Forms or constructions
- G09F2003/0257—Multilayer
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F3/00—Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps
- G09F3/02—Forms or constructions
- G09F2003/0272—Labels for containers
- G09F2003/0273—Labels for bottles, flasks
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
The invention discloses a method for manufacturing a high-transparency in-mold label for PET injection molding, which comprises the steps of selecting a PET film, internally printing, compounding, coating thermoplastic, coating a protective layer, cutting into a mold, forming and packaging a finished product, wherein the in-mold label manufactured by adopting the process is not easy to fall off when being combined with a PET container, and is high in labeling precision; the defect of high rejection rate caused by the fact that the thin-wall container and the traditional special-shaped bottle are labeled by using non-setting adhesive is overcome; the price of the adopted raw materials is low, the cost of the in-mold label is approximately the same as that of the traditional film label, and the cost economy is realized; the labeling process of the label in the mold can be formed in one step, and the production automation is convenient. The invention is used in the field of packing boxes of high-end cigarettes, wines, cosmetics and gifts.
Description
Technical Field
The invention relates to the field of high-end packaging boxes for cigarettes, wines, cosmetics and gifts, in particular to a method for manufacturing a high-transparency in-mold label for PET injection molding.
Background
The noun explains:
PET plastic container: PET is commonly called polyester resin and is the most important variety in thermoplastic polyester. PET plastic is processed into plastic containers, packaging films, rolls, beer bottles and the like in the packaging field, is widely used for packaging carbonated beverages, drinking water, fruit juice, enzyme, tea beverages and the like, is widely used in a plurality of fields such as food, chemical engineering, medicine packaging and the like, and is one of the beverage packaging materials with the largest use amount at present.
Injection molding: a method for producing plastic products during plastic injection molding is characterized in that molten plastic is injected into a plastic product mold by an injection molding machine by utilizing pressure, and various plastic parts are obtained after cooling and molding.
UV printing: a printing process for drying and curing ink by ultraviolet light needs to match the ink containing photosensitizer with a UV curing lamp, and the application of UV printing is one of the most important contents in the printing industry.
Relief printing: in letterpress printing, the ink is distributed uniformly by the ink feed of the press and then transferred to the printing plate by the inker, which transfers ink only to the image and text portions of the printing plate, but not to the image and text portions, since the image and text portions on the letterpress are much higher than the non-image and text portions on the printing plate. The paper feeding mechanism of the printing machine feeds paper to the printing part of the printing machine, and under the combined action of the printing plate device and the impression device, the ink of the image-text part of the printing plate is transferred to a printing stock, so that the printing of a printed product is completed.
In-mold labeling: the printed trademark label image printed sheet (with hot melt adhesive on the back) is directly placed into a casting mould area in a plastic casting mould machine by a mechanical arm, and the label and the container are combined together by blow moulding or injection moulding to form a complete packaging container. The biggest characteristic of the container using the in-mold label is that the label and the bottle body are on the same surface, and the color pictures and texts of the label are sensed as if the label is directly printed on the surface of the bottle body.
PET-IML process: the in-mold label is firstly fed into the inner wall of the mold through the manipulator, and the curing glue on the back surface of the in-mold label is dissolved at the temperature of the bottle blank, so that the in-mold label and the PET container are combined into a whole.
For the appearance decoration of PET containers, the following methods are generally applied: 1. the contents are directly silk-screened on the PET container, the method is suitable for illustration and simple pattern display, and the surface of the bottle body is printed after being processed; 2. the shrink film is used for labeling, the method has application in the industry, needs secondary treatment and is difficult to recover products; 3. the transfer printing technology is that the content of the device is directly manufactured into a transfer printing film which is transferred on the surface of the container by a heat transfer printing or water transfer printing method, and the process is complicated and pollutes the environment; 4. the adhesive sticker label has adhesiveness, but the PET container has strong polarity, and bubbles and wrinkles are easy to appear on the label during labeling, so that the adhesive effect of the label is influenced, the attractiveness of the container is influenced, and particularly for transparent containers, the defects are more prominent.
In order to achieve better decorative effect and anti-counterfeiting performance of transparent packaging labels, the packaging industry has developed a PET-IML technology, but because the materials and the manufacturing process of the current in-mold labels are limited, the effect that the in-mold labels are perfectly attached to PET containers cannot be achieved, and the most important defect is that the in-mold labels are not transparent enough.
Disclosure of Invention
The invention aims to provide a method for manufacturing an in-mold label for PET injection molding, which has high bonding strength and good transparency.
The technical scheme adopted by the invention is as follows:
a method for manufacturing a high-transparency in-mold label for PET injection molding comprises the following steps:
a. selecting a transparent PET film to be used;
b. one of the PET films is used as a base film, and a pattern layer is attached to the lower surface of the base film;
c. taking another PET film as a fusion film, compounding the upper surface of the fusion film and a base film to jointly clamp a pattern layer to form a primary in-mold label;
d. coating thermoplastic glue on the lower surface of the fusion film;
e. coating a protective layer on the upper surface of the base film;
f. cutting the formed in-mold labels, and packaging a plurality of independent in-mold labels into finished products.
As a modification of the above scheme, a PET film model No. 30 is adopted in the step a.
As a modification of the above, step b corona-treats the lower surface of the base film before attaching the pattern layer.
As a modification of the above scheme, the pattern layer in step b is patterned by UV relief printing, and then the pattern is further cured by a UV curing process.
As an improvement of the above scheme, in the step c, a dry compounding method or a solvent-free compounding method is adopted for the base film and the fusion film, and the high temperature resistant glue is coated between the base film and the fusion film and around the pattern layer in both the dry compounding method and the solvent-free compounding method.
As an improvement of the above scheme, the thermoplastic resin is coated twice in step d, and the thermoplastic resin is coated for the second time after the thermoplastic resin coated for the first time is dried.
As an improvement of the scheme, an antistatic agent is added into the thermoplastic glue coated for the second time.
As the improvement of the scheme, the lower surface of the thermoplastic is arranged flatly.
As an improvement of the above scheme, the protective layer in the step e is an antistatic oil layer.
As an improvement of the above scheme, when the mold is cut in the step f, static electricity on the in-mold label needs to be removed by using a static electricity removing device.
The invention has the beneficial effects that: the manufacturing method relates to the whole processing flow of the in-mold label, the in-mold label manufactured by the flow is not easy to fall off when being combined with a PET container, and the labeling precision is high; the defect of high rejection rate caused by the fact that the thin-wall container and the traditional special-shaped bottle are labeled by using non-setting adhesive is overcome; the price of the adopted raw materials is low, the cost of the in-mold label is approximately the same as that of the traditional film label, and the cost economy is realized; the labeling process of the label in the mold can be formed in one step, and the production automation is convenient.
Drawings
The invention will be further described with reference to the accompanying drawings in which:
FIG. 1 is a flow chart of a manufacturing method in the present embodiment;
fig. 2 is a cross-sectional view of the in-mold label in this embodiment.
Detailed Description
Referring to fig. 1 and 2, the present invention is a method for manufacturing a highly transparent in-mold label for PET injection molding, comprising the steps of:
1) selecting a required transparent PET film:
since this type of in-mold label is mainly used for PET containers, in order to ensure that the in-mold label can be closely fitted to the PET container, a PET film model # 30 is used. Two PET films are used here, and for convenience of description, one of the PET films is used as the base film 1 and the other PET film is used as the fusion film 2. The lower surface of the basement membrane 1 is attached with a pattern layer 3, namely, the inner printing process, and the upper surface of the fusion membrane 2 and the basement membrane 1 are compounded to clamp the pattern layer 3 together to form a primary in-mold label. When the in-mold label is combined with the PET container, namely the fusion film 2 is combined with the PET, the in-mold label can be well combined with the PET container due to the good chemical similarity of the fusion surfaces of the two, so that the troubles that the traditional label is easy to fall off, damage, mildew and the like are solved, and the labeling precision and the finished product rate can be ensured; particularly, the transparency of the PET film is very high, the edge of the whole in-mold label is integrated with the PET container, and the appearance brand image is improved. In addition, in recycling PET containers, the in-mold labels, which are chemically similar, are recovered off-tape and then recycled.
In a preferred embodiment, the lower surface of the base film 1 is corona-treated before the base film 1 is attached with the pattern layer 3, so that the adhesion of the base film 1 can be improved.
As a preferred embodiment, the pattern layer 3 is patterned using UV relief printing, and then the pattern is further cured through a UV curing process. Ink is attached to the part of the UV relief printing plate, only the part of the UV relief printing plate is tightly attached to the base film 1 when the ink is transferred to the base film 1, other parts of the UV relief printing plate are not always contacted with the base film 1, and the part of the base film 1 without patterns is transparent at the moment, so that the visual effect which is natural to the PET container and the in-mold label is further improved. Then, the UV relief printing process may be further combined with a gold stamping process or a 3D printing process to make the pattern layer 3 have a metallic feeling and a relief feeling.
In a preferred embodiment, the base film 1 and the fused film 2 are applied by a dry lamination method or a solvent-free lamination method, and the base film 1 and the fused film 2 and the pattern layer 3 are coated with a high temperature resistant adhesive in both the dry lamination method and the solvent-free lamination method. This solution is used to avoid that the in-mould label is washed away by the high temperature PET solution when the PET container is bonded, breaking the pattern layer 3.
2) And coating thermoplastic glue 4 on the lower surface of the fused film 2:
since the in-mold label is subjected to high temperature and impact in the mold for about two seconds, the thermoplastic 4 is coated twice, and the thermoplastic 4 is coated a second time after the first coated thermoplastic 4 is dried. Coating the two-component thermoplastic 4 for the first time to increase the adhesion; a small amount of antistatic agent is added into the thermoplastic 4 coated for the second time, so that static electricity generated by the in-mold label is avoided, double sheets can be prevented from being generated in subsequent processing, and the in-mold label is ensured to be convenient to separate from each other due to the sliding property. The coating temperature is controlled to be 45-80 ℃, and the coating speed is controlled to be about 30 m/min.
Since the in-mold label needs to maintain high transparency and the typical thermoplastic 4 has poor transparency, the thickness of the thermoplastic 4 should be properly set according to the actual processing conditions so that it can be completely melt-absorbed by the PET container.
In a preferred embodiment, the lower surface of the thermoplastic 4 is arranged flat, i.e. a smooth roller is used to roll the thermoplastic 4 appropriately.
3) Coating a protective layer 5 on the upper surface of the base film 1:
the upper surface of the basement membrane 1 is used for outward display, the flexible coating system is used for polishing oil, and the antistatic oil layer is coated to serve as a protective layer 5, so that the upper surface of the basement membrane 1 is prevented from being scratched. The protective layer 5 is a anilox roller with the coating weight of 2-5 g/m and the coating weight of 150-300 lpi2(ii) a The coating temperature was maintained at room temperature and the humidity was about 65%. After the protective layer 5 was coated, the electrostatic value of the surface was measured using an electrostatic measuring instrument, and a passing line was defined below 0.5 Kv.
4) Cutting the formed in-mold labels, and then packaging a plurality of independent in-mold labels into finished products:
the circular die cutting machine or the flat cutting machine is generally used for cutting off the strip-shaped in-mold label, and because static electricity removal is very important in the cutting-off process, static electricity on the in-mold label needs to be removed by using static electricity removal equipment. The electrostatic equipment can be an electrostatic rod, a metal wire, an electrostatic eliminator or an ion fan, and the like, and the effect of static elimination is based on that the finished product is not adhered.
And finally, a piece of in-mold label is obtained, clamping plates are placed at two ends of the stacked in-mold labels and then are bundled, two ends of the in-mold label are fixed, the in-mold label is packaged by using a shrink film and then packaged by using a hard board, so that the flatness of the finished in-mold label is ensured, and the edge of the in-mold label is prevented from being damaged. When the bound in-mold label is packed by the carton, the carton is ensured to be full, and when the carton is not full, the carton is filled with waste materials as much as possible, so that static charges of the in-mold label are prevented from being increased by shaking in the transportation process, and the carton does not need to be carried frequently. Meanwhile, when the in-mold label is stored, the environmental humidity needs to reach more than 50%, and the generation of static electricity is reduced.
The manufacturing method relates to the whole processing flow of the in-mold label, and the design of the double-layer PET film, the reasonable coating of the thermoplastic adhesive 4, the static electricity removal and the like has the advantages that the pattern layer 3 can be well preserved, the in-mold label is not easy to fall off when being combined with a PET container, and the defect of high rejection rate caused by the fact that the thin-wall container and the traditional special-shaped bottle are labeled by the adhesive is overcome; the raw material price of the PET film is low, the cost of the in-mold label is approximately the same as that of the traditional film label, and the cost economy is realized; the labeling precision is high, and the transparency of the label in the mold is high; the labeling process of the in-mold label can be formed in one step, so that the picking and transfer of a manipulator are facilitated, and the production automation is facilitated; when the pattern layer 3 adopts the anti-counterfeiting pattern, the in-mold label also has an anti-counterfeiting effect.
Of course, the design creation is not limited to the above embodiments, and the combination of different features of the above embodiments can also achieve good effects. Those skilled in the art can make equivalent changes or substitutions without departing from the spirit of the present invention, and such equivalent changes or substitutions are included in the scope defined by the claims of the present application.
Claims (9)
1. A method for manufacturing a high-transparency in-mold label for PET injection molding is characterized by comprising the following steps:
a. selecting a transparent PET film to be used;
b. one of the PET films is used as a base film (1), and a pattern layer (3) is attached to the lower surface of the base film (1);
c. taking another PET film as a fusion film (2), compounding the upper surface of the fusion film (2) and a base film (1) to jointly clamp a pattern layer (3) to form a primary in-mold label;
d. coating thermoplastic glue (4) on the lower surface of the fusion film (2) twice, coating the two-component thermoplastic glue (4) for the first time, and coating the thermoplastic glue (4) for the second time after the thermoplastic glue (4) coated for the first time is dried, wherein the coating temperature is controlled to be 45-80 ℃;
e. coating a protective layer (5) on the upper surface of the base film (1);
f. cutting the formed in-mold labels, and packaging a plurality of independent in-mold labels into finished products.
2. The method for manufacturing a highly transparent in-mold label for PET injection molding according to claim 1, wherein: and a PET film with the model number of 30# is adopted in the step a.
3. The method for making a highly transparent in-mold label for PET injection molding according to claim 1 or 2, characterized in that: the step b is to carry out corona treatment on the lower surface of the base film (1) before attaching the pattern layer (3).
4. The method for manufacturing a highly transparent in-mold label for PET injection molding according to claim 3, wherein: and in the step b, the pattern layer (3) is printed with a pattern by using a UV relief printing plate, and then the pattern is further cured by a UV curing process.
5. The method for manufacturing a highly transparent in-mold label for PET injection molding according to claim 1 or 4, wherein: in the step c, a dry compounding mode or a solvent-free compounding mode is adopted for the base film (1) and the fusion film (2), and high-temperature-resistant glue is coated between the base film (1) and the fusion film (2) and around the pattern layer (3) in the dry compounding mode and the solvent-free compounding mode.
6. The method for manufacturing a highly transparent in-mold label for PET injection molding according to claim 1, wherein: an antistatic agent is added into the thermoplastic (4) coated for the second time.
7. The method for manufacturing a highly transparent in-mold label for PET injection molding according to claim 6, wherein: the lower surface of the thermoplastic (4) is arranged flatly.
8. The method for manufacturing a highly transparent in-mold label for PET injection molding according to claim 1, 6 or 7, wherein: and in the step e, the protective layer (5) is an antistatic oil layer.
9. The method for manufacturing a highly transparent in-mold label for PET injection molding according to claim 8, wherein: and f, when the mould is cut in the step f, static electricity on the label in the mould is removed by using static removing equipment.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810755977.2A CN109166451B (en) | 2018-07-11 | 2018-07-11 | Method for manufacturing high-transparency in-mold label for PET injection molding |
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| CN201810755977.2A CN109166451B (en) | 2018-07-11 | 2018-07-11 | Method for manufacturing high-transparency in-mold label for PET injection molding |
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| CN109166451B true CN109166451B (en) | 2022-01-04 |
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| CN110525077A (en) * | 2019-09-17 | 2019-12-03 | 东莞市源新包装制品有限公司 | A kind of printing composite transferring citicall limited aluminium shrink sleeve label label packing method |
| CN111037649A (en) * | 2019-12-12 | 2020-04-21 | 郑州领胜科技有限公司 | Hot melt adhesive full-page number supplementing process |
| CN111331921A (en) * | 2020-03-04 | 2020-06-26 | 滁州远达彩印包装有限公司 | Manufacturing method of waterproof gift packaging box |
| CN111798737A (en) * | 2020-07-15 | 2020-10-20 | 惠州市惠阳区艺高印刷有限公司 | Adhesive label and manufacturing method thereof |
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| JP2015087757A (en) * | 2013-09-26 | 2015-05-07 | サトーホールディングス株式会社 | Roll state mount-less label |
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| CN101225607A (en) * | 2008-01-29 | 2008-07-23 | 福建思嘉环保材料科技有限公司 | Knitted camouflage waterproof cloth |
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