阅读说明：本技术 聚乳酸膜复合聚乳酸无纺布及其生产工艺和生产线 (Polylactic acid film composite polylactic acid non-woven fabric and production process and production line thereof ) 是由 顾惠东 顾介立 于 2019-09-06 设计创作，主要内容包括：本发明公开了一种聚乳酸膜复合聚乳酸无纺布及其生产工艺和生产线,所述聚乳酸膜复合聚乳酸无纺布从上到下依次包含聚乳酸膜层和聚乳酸无纺布层,所述聚乳酸膜层和聚乳酸无纺布层通过同质熔融的方式复合在一起。本发明的成品环保可降解,工艺方法巧妙简洁,通过创新的方法,将聚乳酸膜复合到了聚乳酸无纺布布面上,得到的成品环保可降解无污染,对环境十分友好,且成品复合牢度好,卷林两端平整度好,流延时膜面均匀度好,成品不会有粘连,实用性极强,值得推广。(The invention discloses a polylactic acid film composite polylactic acid non-woven fabric, a production process and a production line thereof. The finished product of the invention is environment-friendly and degradable, the process method is ingenious and simple, the polylactic acid film is compounded on the cloth cover of the polylactic acid non-woven fabric through an innovative method, the obtained finished product is environment-friendly and degradable, has no pollution, is very environment-friendly, has good compounding fastness, good flatness of two ends of the roll forest, good film surface uniformity during casting, no adhesion of the finished product, strong practicability and worth popularizing.)

1. The polylactic acid film and polylactic acid composite non-woven fabric is characterized by sequentially comprising a polylactic acid film layer and a polylactic acid non-woven fabric layer from top to bottom, wherein the polylactic acid film layer and the polylactic acid non-woven fabric layer are compounded together in a homogeneous melting mode.

2. The production process of the polylactic acid film and polylactic acid composite non-woven fabric according to claim 1, comprising the following steps:

(1) preparing polylactic acid non-woven fabric;

(2) melting the polylactic acid particles;

(3) casting the polylactic acid melted in the step (2) into a film;

(4) and (4) directly compounding the film cast in the step (3) on the polylactic acid non-woven fabric, wherein the fusion method is homogeneous fusion.

3. The production process according to claim 2, wherein the preparation of the polylactic acid nonwoven fabric in the step (1) comprises unwinding of the nonwoven fabric and tension adjustment and corona treatment after unwinding.

4. The production process according to claim 2, wherein in the step (3), a die having a T-shaped outlet is used in casting.

5. The production process as claimed in claim 2, wherein the fusion temperature in the step (4) is 200-260 ℃.

6. The production process according to claim 2, wherein the equipment used for casting and fusing in the step (3) and the step (4) is a casting and compounding equipment.

7. The production process according to claim 2, wherein the film surface is treated with multi-roll cooling while the fusion in the step (4).

8. The production process according to claim 2, wherein a corona treatment process is further provided after the fusion of the step (4).

9. The production line for preparing the polylactic acid film and polylactic acid composite non-woven fabric according to claim 1, which comprises an unreeling device, a casting compounding device and a reeling device which are sequentially arranged, wherein the casting compounding device comprises a melt extrusion device and a compounding machine.

10. The production line of claim 8, wherein the outlet of the melt extrusion device is a die with a T-shaped outlet.

11. The production line of claim 9, wherein the die with the T-shaped outlet comprises a base lower die and an adjusting upper die which are matched with each other, a flow channel connected to the front end of the base lower die and used for receiving molten materials is arranged on the base lower die, the adjusting upper die comprises a front end fixing portion and a tail end adjusting portion, the front end fixing portion is fixed to the base lower die without a gap, the flow channel outlet of the base lower die is located behind a fixing point fixed to the front end fixing portion of the adjusting upper die, and the bottom of the flow channel outlet is fixedly connected with the tail end adjusting portion and the upper end of the flow channel outlet is connected through an adjusting bolt so as to conveniently raise or lower the height of the.

Technical Field

The invention belongs to the field of plastic product manufacturing, and particularly relates to a polylactic acid film and polylactic acid composite non-woven fabric, and a production process and a production line thereof.

Background

Nonwoven fabrics, also known as nonwovens, are made from man-made fibers. The non-woven fabric breaks through the traditional spinning principle and has the characteristics of short process flow, high production speed, high yield, low cost, wide application, multiple raw material sources and the like. The non-woven fabric has wide application and large consumption, almost relates to various industries, is an industry which is the fastest developed industry in China and the world at present and is called as a sunward enterprise, but most non-woven fabric products become white garbage after being discarded to pollute the environment. With the increasing emphasis on environmental protection, people expect more and more plastic products to be degradable so as to reduce the pollution to the environment.

Disclosure of Invention

The invention aims to solve the technical problem of providing the environment-friendly degradable polylactic acid film composite polylactic acid non-woven fabric.

The invention is realized by the following technical scheme:

the polylactic acid film composite polylactic acid non-woven fabric sequentially comprises a polylactic acid film layer and a polylactic acid non-woven fabric layer from top to bottom, and the polylactic acid film layer and the polylactic acid non-woven fabric layer are compounded together in a homogeneous melting mode.

The invention also discloses a production process of the polylactic acid film composite polylactic acid non-woven fabric, which comprises the following process steps:

(1) preparing polylactic acid non-woven fabric;

(2) melting the polylactic acid particles;

(3) casting the polylactic acid melted in the step (2) into a film;

(4) and (4) directly compounding the film cast in the step (3) on the polylactic acid non-woven fabric, wherein the fusion method is homogeneous fusion.

Preferably, in the step (1), the prepared polylactic acid non-woven fabric comprises the steps of non-woven fabric unwinding, tension adjustment and corona treatment after the non-woven fabric unwinding, and the corona can increase static electricity on the fabric surface for better compounding.

Preferably, in the step (3), a die with a T-shaped outlet is used during casting; the T-shaped outlet is a structure with a large front end and a flat and wide rear end, molten materials enter a die from the large front end and are extruded from the flat and wide rear end, and the die with the T-shaped outlet is used.

Preferably, in the step (2) and the step (3), the melting and the casting of the polylactic acid particles into the film are carried out by using a screw extruder, and a die at the outlet of the screw extruder is a die with a T-shaped outlet;

more preferably, the temperature of each section of the screw extruder is 140 ℃, 160 ℃, 230 ℃ and 230 ℃ in sequence, the temperature of the filter is 220 ℃, the temperature of the adapter tube is 230 ℃, 230 ℃ and 230 ℃ in sequence, and the temperature of the die with the T-shaped outlet is 230 ℃ in all.

Preferably, the fusion temperature in the step (4) is 200-260 ℃, and the temperature is controlled to make the polylactic acid casting film easier to be compounded on the polylactic acid non-woven fabric due to homogeneous fusion. More preferably, the fusion temperature is 230 ℃.

Preferably, the casting and fusing equipment used in the step (3) and the step (4) is casting compounding equipment, and casting and compounding can be completed at one time by using the casting equipment, so that the cast film is directly compounded on the polylactic acid non-woven fabric surface.

Preferably, the film surface is treated by multi-roll cooling at the same time as the fusion in the step (4). The film surface is cooled and treated by multiple rollers, so that the film surface can be smooth, and the film surface is not adhered after the finished product is obtained.

Preferably, after the step (4) fusing, a treatment for improving the composite fastness is also provided.

Preferably, after the step (4) is fused, a corona treatment process is further provided, and more preferably, the corona treatment process is further provided with a treatment for improving the compounding fastness.

Preferably, after the treatment, a corona treatment process is also provided, so that the tension of the film surface is increased to meet the requirement of later film surface printing.

The invention also discloses a production line for preparing the polylactic acid film and polylactic acid composite non-woven fabric, which comprises an unreeling device, a casting compounding device and a reeling device which are sequentially arranged, wherein the casting compounding device comprises a melt extrusion device and a compound machine.

Preferably, the melt extrusion device is a screw extrusion device.

Preferably, the outlet of the melt extrusion device is a die with a T-shaped outlet.

More preferably, the outlet gap of the die with the T-shaped outlet is 0.2-1mm, and more preferably, the outlet gap is 0.65-0.7 mm.

Preferably, the mould of taking T type export is including the basic lower mould of mutually supporting and adjusting the mould, is equipped with the runner that is connected to the front end and is used for accepting the melt on the basic lower mould, adjusts the mould and includes front end fixed part and tail end regulation portion, and front end fixed part is fixed with basic lower mould zero clearance, and the runner export of basic lower mould is located the fixed point rear position fixed with the front end fixed part of adjusting the mould, between front end fixed part and the tail end regulation portion, bottom fixed connection, the upper end is connected through adjusting bolt in order conveniently to raise or lower the height of tail end regulation portion, and then reaches the nimble effect of adjusting the export clearance between the mould on the basic lower mould and the regulation.

Preferably, the front end fixing part is connected with the basic lower die through a screw rod to realize gapless fixing.

Preferably, a tension adjusting device and a first corona treatment device are sequentially arranged between the unreeling device and the casting compound equipment.

Preferably, a second corona treatment device is further arranged between the composite fastness improving device and the winding device.

The invention innovatively compounds the polylactic acid tape casting on the polylactic acid non-woven fabric directly through temperature control, so that the two materials are fused and fused homogeneously, the change is only deformation, and chemical change cannot occur.

The invention also improves the compounding fastness of the polylactic acid after the polylactic acid is compounded on the polylactic acid non-woven fabric by casting through temperature control because the melting is adopted, the physical and chemical reaction is that high-temperature melt is easy to fuse, and the gap of the outlet of the die is matched with the temperature. The method breaks through the technical difficulty that the temperature fusion balance point is difficult to master when the two are fused.

The invention can ensure that the uniformity of the film surface is good when the polylactic acid is cast by controlling the opening clearance of the die, because the pressure in the die cavity is insufficient, under the condition of insufficient pressure, the die with the T-shaped outlet is beneficial to controlling the opening clearance of the die to ensure that the pressure at the casting outlet is sufficient and consistent, thereby ensuring the good uniformity of the film surface. The method breaks through the technical difficulty that the melt flow speed is difficult to control.

The invention has the beneficial effects that:

the finished product of the invention is environment-friendly and degradable, the process method is ingenious and simple, the polylactic acid film is compounded on the cloth cover of the polylactic acid non-woven fabric through an innovative method, the obtained finished product is environment-friendly and degradable, has no pollution, is very environment-friendly, has good compounding fastness, good flatness of two ends of the roll forest, good film surface uniformity during casting, no adhesion of the finished product, strong practicability and worth popularizing.

Drawings

For ease of illustration, the invention is described in detail by the following specific examples and figures.

FIG. 1 is a schematic structural view of the finished product of the present invention;

FIG. 2 is a schematic view of a production line according to the present invention;

fig. 3 is a schematic structural view of a die with a T-shaped outlet.

Detailed Description

As shown in fig. 1 to 3, the polylactic acid film-polylactic acid nonwoven fabric comprises a polylactic acid film layer 200 and a polylactic acid nonwoven fabric layer 100 in this order from top to bottom, and the polylactic acid film layer 200 and the polylactic acid nonwoven fabric layer 100 are bonded together by melting at the same phase.

The production process of the polylactic acid film and polylactic acid composite non-woven fabric comprises the following steps:

(1) preparing polylactic acid non-woven fabric;

(2) melting the polylactic acid particles;

(3) and (3) casting the polylactic acid melted in the step (2) into a film, and using a die with a T-shaped outlet during casting. The T-shaped outlet is a structure with a large front end and a flat and wide rear end, and molten materials enter a die from the large front end and are extruded from the flat and wide rear end. The width of the film surface can be better controlled by setting the width of the outlet, so that the width of the film surface is stable, the thickness of the film can be well controlled by setting the gap of the outlet, the film thickness is uniform, the width of the film surface is stable, the film thickness is uniform, and the flatness of the two ends of the finished product of the rolling forest can be good.

(4) And (4) directly compounding the film cast in the step (3) on the polylactic acid non-woven fabric, wherein the fusion method is homogeneous fusion. The fusion temperature is 200-260 ℃, and the polylactic acid casting film can be easily compounded to the polylactic acid non-woven fabric due to homogeneous fusion by controlling the temperature. More preferably, the fusion temperature is 230 ℃.

The equipment used for casting and fusing in the step (3) and the step (4) is casting compounding equipment, and casting and compounding can be completed at one time by using the casting equipment, so that the cast film is directly compounded on the cloth cover of the polylactic acid non-woven fabric.

The film surface was treated with multi-roll cooling while the fusion was performed in step (4). The film surface is cooled and treated by multiple rollers, so that the film surface can be smooth, and the film surface is not adhered after the finished product is obtained.

The production line of the above-mentioned polylactic acid film composite polylactic acid non-woven fabrics of preparation, including unwinding device 1, tension adjusting device 2, first corona treatment device 3, curtain coating equipment complex, compound fastness hoisting device 4, second corona treatment device 5, the coiling mechanism 6 that set up in order, curtain coating equipment complex includes melting extrusion device 7 and compounding machine 8 in proper order, the exit of melting extrusion device 7 is the mould 9 of taking T type export.

The melt extrusion device 7 is a screw extrusion device.

The outlet gap of the die 9 with the T-shaped outlet is 0.2-1mm, and more preferably, the outlet gap is 0.65-0.7 mm.

The mould 9 of taking T type export is including the basic lower mould 10 of mutually supporting and adjusts mould 11, is equipped with the runner 10.1 that is connected to the front end and is used for accepting the melt on the basic lower mould 10, adjusts mould 11 and includes front end fixed part 11.1 and tail end regulation portion 11.2, and front end fixed part 11.1 is fixed with basic lower mould 10 zero clearance, and the runner export 10.2 of basic lower mould 10 is located and adjusts the fixed point rear position of the front end fixed part 11.1 of mould 11, between front end fixed part 11.1 and the tail end regulation portion 11.2, bottom fixed connection, the upper end is connected through adjusting bolt 11.3 in order conveniently to raise or lower the height of tail end regulation portion 11.2, and then reaches the effect of the export clearance between nimble regulation basic lower mould 10 and the regulation mould 11.

The front end fixing part 11.1 is connected with the basic lower die 10 through a screw rod to realize gapless fixing.

The polylactic acid non-woven fabric is firstly unreeled by an unreeling device, then is subjected to tension adjustment by a tension adjusting device, then is subjected to corona treatment for the first time, then is introduced into a compound machine to be compounded with polylactic acid melt cast from a melt extrusion device, and after compounding is completed, compounding fastness is improved by a compounding fastness improving device 5, and the compounding fastness is treated by a second corona treatment device so as to increase the surface tension of the film to meet the later film surface printing requirement, and finally is collected by a reeling device.

The finished product of the invention is environment-friendly and degradable, the process method is ingenious and simple, the polylactic acid film is compounded on the cloth cover of the polylactic acid non-woven fabric through an innovative method, the obtained finished product is environment-friendly and degradable, has no pollution, is very environment-friendly, has good compounding fastness, good flatness of two ends of the roll forest, good film surface uniformity during casting, no adhesion of the finished product, strong practicability and worth popularizing.

The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that are not thought of through the inventive work should be included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope defined by the claims.