阅读说明：本技术 一种复合流延淋膜及其制备方法 (Composite casting film and preparation method thereof ) 是由 梁永江 李嘉豪 张维军 于 2019-10-11 设计创作，主要内容包括：本发明公开了一种复合流延淋膜及其制备方法,该复合流延淋膜由聚烯烃材料25~75份和PE材料25~75份通过淋复热合方法结合制得,聚烯烃材料原料丰富,价格低廉,容易加工成型,综合性能优良,PE材料柔而韧,有优异的化学稳定性,以LLDPE、LDEP、HDPE、mLLDPE、MDPE、PET、PVC或PP中的一种或两种及两种以上任意比例的混合物制作聚烯烃基材,将油墨印刷在聚烯烃基材表面之上,以LLDPE、LDEP、HDPE、mLLDPE、MDPE的一种或两种及两种以上任意比例的混合物流延法制作PE层,聚烯烃基材与PE层淋复热合,令油墨封锁在两种基材之中,隔绝油墨气味,避免印刷油墨受外界影响出现迁移脱落的情况,有效地保留印刷图案的完整,确保印刷品美观,为消费者提供安全保障。(The invention discloses a composite casting drenching film and a preparation method thereof, the composite casting drenching film is prepared by combining 25 ~ 75 parts of polyolefin material and 25 ~ 75 parts of PE material through a casting complex heat sealing method, the polyolefin material has rich raw materials, low price, easy processing and forming, excellent comprehensive performance, flexibility and toughness of the PE material and excellent chemical stability, one or a mixture of two or more of LLDPE, LDEP, HDPE, mLLDPE, MDPE, PET, PVC or PP in any proportion is used for preparing a polyolefin substrate, ink is printed on the surface of the polyolefin substrate, one or a mixture of two or more of LLDPE, LDEP, HDPE, mLLDPE and MDPE in any proportion is used for preparing a PE layer through a casting method, the polyolefin substrate and the PE layer are subjected to casting complex heat sealing, the ink is blocked in the two substrates, the odor of the ink is isolated, the condition that the printing ink migrates and falls off under the influence of the outside is avoided, the integrity of a printing pattern is effectively kept, the attractiveness of the printed product is ensured, and the safety guarantee is provided for consumers.)

1. A composite casting curtain coating film is characterized in that the mass of the composite casting curtain coating film is 20-45 g/m²The composite material is prepared from the following raw materials in parts by weight:

25 ~ 75 parts of polyolefin material and 25 ~ 75 parts of PE material;

wherein the polyolefin material is one or a mixture of two or more of LLDPE, LDEP, HDPE, mLLDPE, MDPE, PET, PVC or PP in any proportion;

the PE material is one or a mixture of two or more of LLDPE, LDEP, HDPE, mLLDPE and MDPE in any proportion.

2. A method of making a composite cast curtain as claimed in claim 1, characterised by the steps of:

(1) production of polyolefin substrate: firstly, conveying a polyolefin material into a set of independent screw extruder, melting the polyolefin material into fluid at the temperature of 130-230 ℃, and then forming the fluid through a film blowing machine and a casting machine to obtain a polyolefin base material;

(2) corona treatment: subjecting a polyolefin substrate to surface corona treatment to impart a wetting tension of not less than 38 dynes or more to the surface thereof, thereby improving the surface activity;

(3) printing ink: printing the ink on the surface of the polyolefin substrate by adopting a gravure or flexographic printing process;

(4) unreeling the coiled material: placing the printed polyolefin substrate on a unreeling rack with tension teaching;

(5) manufacturing a PE base material: metering and mixing PE materials, conveying the PE materials into a set of independent screw extruder, and melting the PE materials into fluid at the temperature of 150-280 ℃;

(6) and (3) leaching, compounding with heat and mixing: the temperature of the casting die head is 250-350 ℃, and the polyolefin substrate with the printing surface and the PE layer are subjected to repeated pouring and thermal combination through the casting melting temperature;

(7) cooling and shaping: cooling, laminating and shaping the composite casting film at the temperature of 15-35 ℃;

(8) and (4) rolling, slitting and packaging the composite casting laminated film to obtain a finished product composite casting laminated film, and warehousing and storing the batch of composite casting laminated film after the inspection is qualified.

3. A method of making a composite cast curtain as claimed in claim 2 wherein the ink type in step (3) is one or more different color inks.

Technical Field

The invention relates to the field of high polymer materials, in particular to a composite casting curtain coating and a preparation method thereof.

Background

Along with the development of economy and the improvement of living standard, the consumption demand of people on disposable sanitary products is more and more increased, sanitary towels are widely used as menstrual female sanitary nursing products, consumers want to use more beautiful, more comfortable and safer products, in view of sanitary protection requirements, the disposable sanitary products such as the sanitary towels, the puerperal towels and the breast pads are not only provided with sales packaging bags, but also each sanitary towel needs to be independently wrapped by a film, the traditional film is coated by a single-layer polyethylene film or non-woven fabric, in order to achieve the beautiful effect, the single-color or multi-color printing can be carried out on the film, the ink is easy to fall off under the conditions of high-speed production after the printing, the change of external temperature and humidity, the bumping in transportation and storage, and the like, the product is polluted, in addition, the pigment is mainly contained in the ink, The material is composed of a plurality of chemical raw materials such as a connecting material, a filling agent, a solvent, a dispersing agent, a slipping agent and the like, the materials are easy to separate out under certain temperature and humidity conditions besides friction transfer, and some solvents volatilize at a certain temperature, so that the material has potential health hazard to human bodies.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention provides a composite casting curtain film and a preparation method thereof.

The technical scheme adopted by the invention for solving the technical problems is as follows:

a composite casting laminated film is prepared from the following raw materials in parts by weight:

25-75 parts of polyolefin material and 25-75 parts of PE material.

Wherein the polyolefin material is one or a mixture of two or more of LLDPE, LDEP, HDPE, mLLDPE, MDPE, PET, PVC or PP in any proportion.

The PE material is one or a mixture of two or more of LLDPE, LDEP, HDPE, mLLDPE and MDPE in any proportion.

A method for preparing the composite casting curtain coating comprises the following steps:

(1) production of polyolefin substrate: firstly, conveying a polyolefin material into a set of independent screw extruder, melting the polyolefin material into fluid at the temperature of 130-230 ℃, and then molding the fluid through a film blowing machine and a casting machine to obtain the polyolefin base material.

(2) Corona treatment: the polyolefin substrate is subjected to surface corona treatment to give a wetting tension of not less than 38 dyne or more to the surface thereof, thereby improving the surface activity.

(3) Printing ink: the ink is printed onto the surface of the polyolefin substrate using a gravure or flexographic printing process.

(4) Unreeling the coiled material: the printed polyolefin substrate was placed on a take-up stand with tension teaching.

(5) Manufacturing a PE base material: and (3) metering and mixing the PE materials, conveying the PE materials into a set of independent screw extruder, and melting the PE materials into fluid at the temperature of 150-280 ℃.

(6) And (3) leaching, compounding with heat and mixing: and the temperature of the casting die head is 250-350 ℃, and the polyolefin substrate with the printing surface and the PE layer are subjected to repeated pouring and thermal synthesis through the casting melting temperature.

(7) Cooling and shaping: and cooling, laminating and shaping the composite casting laminated film at the temperature of 15-35 ℃.

(8) And (4) rolling, slitting and packaging the composite casting laminated film to obtain a finished product composite casting laminated film, and warehousing and storing the batch of composite casting laminated film after the inspection is qualified.

The type of the ink in the step (3) is one or more than two different color inks.

The mass of the composite casting curtain coating is 20-45 g/m²。

The invention has the beneficial effects that: the composite casting curtain coating film is prepared by combining the polyolefin material and the PE material through a composite heat sealing method, the polyolefin material is rich in raw materials, low in price, easy to machine and form, excellent in comprehensive performance, soft and tough in the PE material and excellent in chemical stability, and the printing ink is printed on the surface of the polyolefin layer, so that the printing ink is sealed in the two base materials, the smell of the printing ink is isolated, the condition that the printing ink is influenced by the outside to migrate and fall off is avoided, the integrity of a printing pattern is effectively kept, the attractiveness of a printed product is ensured, and safety guarantee is provided for consumers.

Drawings

The invention is further illustrated with reference to the following figures and examples.

FIG. 1 is a flow chart of a method of making a composite cast curtain film provided by the present invention.

Detailed Description

A composite casting drenched film is prepared from the following raw materials:

polyolefin materials and PE materials.

Wherein the polyolefin material is LLDPE (linear low density polyethylene, which is generated by copolymerizing ethylene and high-grade alpha olefin and has the density of 0.918-0.930 g/cm3) or LDEP (low density polyethylene, which is a polymer obtained by polymerizing ethylene as a monomer and has the density of 0.910-0.925 g/cm³) HDPE (high density polyethylene, a polymer obtained by polymerizing ethylene as a monomer and having a density of 0.940-0.976 g/cm³) mLLDPE (metallocene polyethylene, polyethylene produced by using metallocene as polymerization catalyst), MDPE (medium density polyethylene, polyethylene with the number of branched chains on the main chain between that of high density polyethylene and that of low density polyethylene, and the density of 0.925-0.939 g/cm)³) And PET (poly terephthalic acid plastic with the density of 1.37-1.40 g/cm)³) PVC (polyvinyl chloride, a polymer obtained by polymerizing vinyl chloride monomer, having a density of 1.38 to 1.50g/cm³) Or PP (polypropylene, density 0.91 g/cm)³) One or a mixture of two or more of them in any proportion.

The PE material is one or a mixture of two or more of LLDPE, LDEP, HDPE, mLLDPE and MDPE in any proportion.