CN109648951B

CN109648951B - Non-continuous aluminum-plastic composite belt and preparation method thereof

Info

Publication number: CN109648951B
Application number: CN201910008678.7A
Authority: CN
Inventors: 虞家桢
Original assignee: Jiangsu Kemaite Technology Development Co ltd
Current assignee: Jiangsu Kemaite Technology Development Co ltd
Priority date: 2019-01-04
Filing date: 2019-01-04
Publication date: 2020-07-24
Anticipated expiration: 2039-01-04
Also published as: CN109648951A

Abstract

The invention provides a discontinuous aluminum-plastic composite belt and a preparation method thereof. The invention relates to a preparation method of a discontinuous aluminum-plastic composite belt, which comprises the following steps: 1) pulling out and unreeling the aluminum-plastic composite belt, and flatly paving and fixing the aluminum-plastic composite belt on a workbench; 2) carrying out laser cutting on the aluminum-plastic composite belt fixed in the step 1), wherein a plurality of cutting seams with the width of 0.03-0.05 mm are formed on an aluminum foil layer of the aluminum-plastic composite belt; 3) and (3) desorbing the laser-cut aluminum-plastic composite belt obtained in the step 2) and then rolling to obtain the discontinuous aluminum-plastic composite belt. According to the discontinuous aluminum-plastic composite tape obtained by the preparation method, the cutting seam formed by laser cutting of the aluminum foil on the discontinuous aluminum-plastic composite tape is narrow in width, the cutting seam is 0.03-0.05 mm in width, and the polyester film is not penetrated and the aluminum foils on the two sides of the cutting seam are not conducted under the conditions that the aluminum foil is thick and the polyester film is thin.

Description

Non-continuous aluminum-plastic composite belt and preparation method thereof

Technical Field

The invention belongs to the technical field of processing of aluminum-plastic composite belts, and relates to a discontinuous aluminum-plastic composite belt and a preparation method thereof.

Background

The shielding belt is mainly used for wires and cables, plays a role in shielding and guarantees signal transmission. The shielding tape adopted by the existing electric wires and cables in the market is generally composed of a polyester film layer and an aluminum foil layer, and the electrostatic accumulation on the surface of the shielding tape is large due to the structural design. To reduce signal crosstalk, non-continuous shield strips are widely used because they reduce the charge accumulation on the shield elements. Compared with the conventional continuous shielding tape, the non-continuous shielding tape has the advantages that the requirement of shielding grounding is eliminated, the cost for installing the shielding cable is reduced, and the special advantage is realized in the market.

Communication cables for data communications typically include four twisted conductor pairs, each of which serves as a distinct signaling pair over which signals are transmitted, but which are susceptible to electromagnetic sources of another similar nearby cable, wherein the signals received by the twisted pairs from an electromagnetic source outside the cable jacket are referred to as "alien crosstalk" and the signals received from one or more of the other three twisted pairs within the jacket are referred to as "local crosstalk" or "internal crosstalk".

To reduce crosstalk, ① increases the physical separation of the twisted pairs, ② wraps the twisted pairs with continuous shielding foil, ③ wraps the twisted pairs with discontinuous shielding tape that breaks periodically, however, method ① increases the cable diameter and reduces cable flexibility, method ② must ground the shield to the connector to meet safety regulations, not only takes time, but also increases the cost of installing the shielded cable, and method ③ eliminates the need for shield grounding so that any signal in the shield does not extend continuously from one end of the cable to the other, thus the discontinuous shielding tape of method ③ is subsequently introduced into the market.

In the prior art, the aluminum-plastic composite belt comprises an aluminum foil layer and a polyester layer, and at present, the main preparation method of the discontinuous aluminum-plastic composite belt is chemical etching, and the method not only has wide cutting seams (the width of the cutting seams is generally more than 0.1 mm), is easy to generate phenomena of 'corrosion through' and 'side corrosion', and the like, but also has adverse effects on human bodies or the environment.

CN102233482A discloses a laser cutting process for aluminum foil, which comprises the following steps: the aluminum foil is driven to move by the unwinding equipment and the winding equipment, the laser is arranged, the laser emitted by the laser acts on the aluminum foil between the unwinding equipment and the winding equipment to cut the aluminum foil, and the cutting section of the aluminum foil is blown to cool the aluminum foil during cutting. According to the aluminum foil laser cutting process, the aluminum foil is cut through laser, so that the aluminum foil is subjected to hot melting and breaking at high temperature, and thus, the problem that the cutter of a common cutter splitting machine is easy to wear and the phenomenon that the cutting section has serrated burrs is solved.

CN102407405A discloses an aluminum foil laser cutting process, which comprises the following steps: the aluminum foil is flatly laid on the transparent acrylic plate, and air between the aluminum foil and the acrylic plate is extracted; the aluminum foil is laid on the acrylic plate, the cutting head moves to the aluminum foil to be cut, and the compressed air valve is opened, so that the part of the aluminum foil which is not fully contacted with the acrylic plate can be fully contacted; the cutting head adopts a long-focus lens and is matched with the acrylic plate, so that the acrylic plate is not damaged in the cutting process; after the aluminum foil is cut, the workbench moves back, the hairbrush brushes particles generated during cutting, and the dust collector takes away the particles. The invention can ensure the stable operation of the aluminum foil coil during uncoiling and can keep the aluminum foil in a constant tension state.

However, in the two laser cutting processes, the cutting of the aluminum foil by using the laser cutting technology only solves the improvement of the precision and the shape of the aluminum foil during cutting, and does not relate to the narrow cutting seam width obtained after cutting. In the prior art, the research on preparing the discontinuous shielding tape with narrow kerf width by adopting the laser cutting aluminum foil technology is few.

Therefore, it is necessary to provide a non-continuous aluminum-plastic composite tape having a slit with a narrow slit width formed by a laser cutting technique.

Disclosure of Invention

Aiming at the defects of the prior art, the invention aims to provide a discontinuous aluminum-plastic composite tape and a preparation method thereof, wherein a slit formed by laser cutting of an aluminum foil on the discontinuous aluminum-plastic composite tape is narrow in width, the slit is 0.03-0.05 mm in width, and the polyester film is not penetrated and the aluminum foils on the two sides of the slit are not conducted under the conditions of thick aluminum foil and thin polyester film.

In order to achieve the purpose, the invention adopts the following technical scheme:

a preparation method of a discontinuous aluminum-plastic composite belt comprises the following steps:

1) pulling out and unreeling the aluminum-plastic composite belt, and flatly paving and fixing the aluminum-plastic composite belt on a workbench;

2) carrying out laser cutting on the aluminum-plastic composite belt fixed in the step 1), wherein a plurality of cutting seams with the width of 0.03-0.05 mm are formed on an aluminum foil layer of the aluminum-plastic composite belt;

3) and (3) desorbing the laser-cut aluminum-plastic composite belt obtained in the step 2) and then rolling to obtain the discontinuous aluminum-plastic composite belt.

According to the preparation method of the discontinuous aluminum-plastic composite tape, the kerf width of the aluminum foil during laser cutting is reduced by changing the type and the focal length of the focusing lens, so that a narrow kerf with the kerf width of 0.03-0.05 mm is formed on the aluminum-plastic composite tape; the continuity of aluminum foil cutting is realized by adjusting the technological parameters such as laser power, frequency, pulse width, auxiliary gas pressure, cutting rate and the like, and the discontinuous aluminum-plastic composite belt with the polyester film not penetrated and the aluminum foils on two sides of the joint cutting not conducted is prepared under the conditions of thick aluminum foil and thin polyester film.

In the step 1), the unreeling speed of the aluminum-plastic composite tape is 10-15 m/min, for example, the unreeling speed is 10m/min, 11m/min, 12m/min, 13m/min, 14m/min, 15 m/min.

In the step 1), the aluminum-plastic composite belt is flatly laid and fixed on a cutting workbench through vacuum adsorption; preferably, the pressure of the vacuum adsorption is 0.5 to 0.75MPa, for example, the pressure of the vacuum adsorption is 0.5MPa, 0.51MPa, 0.52MPa, 0.53MPa, 0.54MPa, 0.55MPa, 0.56MPa, 0.57MPa, 0.58MPa, 0.59MPa, 0.6MPa, 0.61MPa, 0.62MPa, 0.63MPa, 0.64MPa, 0.65MPa, 0.66MPa, 0.67MPa, 0.68MPa, 0.69MPa, 0.7MPa, 0.71MPa, 0.72MPa, 0.73MPa, 0.74MPa, 0.75 MPa.

In the step 2), the specific process of laser cutting is as follows: the laser is adopted to generate energy, the gathered high-density laser beam is irradiated on the aluminum foil of the aluminum-plastic composite belt through the focusing lens, a cutting seam with the width of 0.03-0.05 mm is formed along with the relative movement of the cutting head and the aluminum-plastic composite belt, the cut slag is blown away by coaxial gas, dust and gasified gas are sucked, and the dust and the gasified gas are treated and discharged through the dust collecting device, so that the cutting of the aluminum foil of the aluminum-plastic composite belt is completed.

In the invention, the laser is a fiber laser; preferably, the output wavelength of the fiber laser is 1064 nm.

Preferably, the laser power of the laser cutting is 48-50W, for example, the power is 48W, 49W and 50W.

Preferably, the pulse frequency of the laser cutting is 125-180 kHz, for example, the pulse frequency is 125kHz, 130kHz, 135kHz, 140kHz, 145kHz, 150kHz, 155kHz, 160kHz, 165kHz, 170kHz, 175kHz, 180 kHz.

Preferably, the pulse width of the laser cutting is 35-65 ns, such as 35ns, 40ns, 45ns, 50ns, 55ns, 60ns, 65 ns.

The focusing lens is an aspheric zinc selenide lens, the focal length is 35-60 mm, and for example, the focal length of the focusing lens is 35mm, 40mm, 45mm, 50mm, 55mm or 60 mm.

Wherein the coaxial gas is nitrogen, and the nitrogen pressure is 0.15-0.2 MPa, such as 0.15MPa, 0.16MPa, 0.17MPa, 0.18MPa, 0.19MPa, and 0.2 MPa.

Preferably, the pressure of the dust suction and the gasified gas is 0.28 to 0.43MPa, for example, the pressure of the dust suction and the gasified gas is 0.28MPa, 0.29MPa, 0.3MPa, 0.31MPa, 0.32MPa, 0.33MPa, 0.34MPa, 0.35MPa, 0.36MPa, 0.37MPa, 0.38MPa, 0.39MPa, 0.4MPa, 0.41MPa, 0.42MPa, 0.43 MPa.

Preferably, the cutting rate of the aluminum foil is 5-9 m/min, for example, the cutting rate is 5m/min, 6m/min, 7m/min, 8m/min, 9 m/min.

In the step 3), the rolling speed of the aluminum-plastic composite belt is 10-15 m/min, for example, the rolling speed is 10m/min, 11m/min, 12m/min, 13m/min, 14m/min and 15 m/min.

The second purpose of the invention is to provide the non-continuous aluminum-plastic composite belt obtained by the preparation method of the first purpose.

The discontinuous aluminum-plastic composite belt obtained by the invention comprises an aluminum foil layer and a polyester film layer, wherein the aluminum foil layer is provided with a plurality of kerfs with the width of 0.03-0.05 mm, for example, the kerfs have the width of 0.03mm, 0.035mm, 0.04mm, 0.045mm and 0.05 mm.

Preferably, the thickness of the aluminum foil layer is 25 μm; preferably, the polyester film layer is a PET layer; preferably, the thickness of the polyester film layer is 22 to 25 μm, for example, the thickness of the polyester film layer is 22 μm, 22.5 μm, 23 μm, 23.5 μm, 24 μm, 24.5 μm, 25 μm.

Compared with the prior art, the invention has the beneficial effects that:

according to the preparation method of the discontinuous aluminum-plastic composite tape, the width of the cutting seam is reduced by selecting a proper focusing lens, so that the narrow cutting seam with the width of 0.03-0.05 mm for the cutting seam of the aluminum foil on the aluminum-plastic composite tape is realized; the continuity of aluminum foil cutting is realized by adjusting the technological parameters such as laser power, frequency, pulse width, auxiliary gas pressure, cutting rate and the like, and the discontinuous aluminum-plastic composite belt with the polyester film not penetrated and the aluminum foils on two sides of the joint cutting not conducted is prepared under the conditions of thick aluminum foil and thin polyester film.

Drawings

FIG. 1 is a schematic flow chart of the manufacturing process of the discontinuous aluminum-plastic composite belt of the present invention.

The reference numbers are as follows:

1-an aluminum-plastic composite belt; 2-cutting the working table; 3-laser cutting machine; 4-coaxial gas; 5-a dust removal pipe; 6-dust collecting means; 7-cutting a seam; 8-discontinuous aluminum-plastic composite belt.

Detailed Description

The technical solution of the present invention is further described by the following specific embodiments with reference to fig. 1.

Unless otherwise specified, various starting materials of the present invention are commercially available or prepared according to conventional methods in the art.

The flow schematic diagram of the preparation process of the discontinuous aluminum-plastic composite belt is shown in figure 1, the aluminum-plastic composite belt 1 is unreeled and operated, the aluminum-plastic composite belt is flatly laid and fixed on a cutting workbench 2, a laser cutting machine 3 generates high-density laser beams to irradiate on an aluminum foil of the aluminum-plastic composite belt 1, the aluminum foil is instantly melted or gasified due to high temperature, cut slag is blown away by coaxial gas 4, dust and gasified gas are sucked by a dust removal pipe 5, the dust and the gasified gas are treated and discharged by a dust collection device 6, a cutting seam 7 with a certain width is formed along with the relative movement of a cutting head and the aluminum-plastic composite belt, and finally the discontinuous aluminum-plastic composite belt 8 is obtained by coiling.

The preparation process of the discontinuous aluminum-plastic composite belt comprises the following steps:

1) unreeling, pulling the aluminum-plastic composite belt out of the coiled material;

2) spreading and fixing, namely spreading and fixing the aluminum-plastic composite belt on a cutting workbench;

3) laser cutting, wherein energy is generated by a laser, the gathered high-density laser beam irradiates on an aluminum foil of the aluminum-plastic composite belt, the aluminum foil is instantly melted or gasified due to high temperature, cut slag is blown away by coaxial gas, dust and gasified gas are sucked, the dust and the gasified gas are treated and discharged by a dust collecting device, a cutting seam with a certain width is formed along with the relative movement of a cutting head and the aluminum-plastic composite belt, and the cutting of the aluminum foil is finished;

4) and (3) rolling, namely desorbing the discontinuous aluminum-plastic composite belt prepared in the step 3) and then rolling.

The process parameters for preparing the non-continuous aluminum-plastic composite tapes according to examples 1 to 8 and comparative examples 1 to 7 of the present invention are shown in table 1, and other parameters, preparation methods, preparation processes, and the like are the same except for the difference of the laser process.

TABLE 1

The aluminum-plastic composite tape structures of examples 1 to 7 and comparative examples 1 to 6 were 25 μm thick aluminum foil and 25 μm thick polyester film, the aluminum-plastic composite tape structure of example 8 was 25 μm thick aluminum foil and 22 μm thick polyester film, and the aluminum-plastic composite tape structure of comparative example 7 was 25 μm thick aluminum foil and 20 μm thick polyester film.

The performance test of the aluminum-plastic composite tapes obtained in examples 1 to 8 and comparative examples 1 to 7 was performed, and the results are shown in table 2, wherein the slit width was measured using a micrometer; measuring conductivity of aluminum foils on two sides of the joint cutting through a universal meter, shifting a meter gear to a position marked with a diode during measurement, connecting a meter pen to two sides of the joint cutting to be measured, and conducting the aluminum foils on the two sides if a sound is made; tensile strength and elongation were measured according to YD/T723.1-2007 method.

TABLE 2

In table 2, the numbers in the composite tape structure indicate the thickness of each layer, and taking the composite tape structure "25 Al/25 PET" as an example, the thickness of the aluminum foil layer is 25 μm, and the thickness of the polyester film layer is 25 μm.

As can be seen from tables 1 and 2, in examples 1 to 3, as the focal length of the aspheric zinc selenide focusing lens gradually increases, the notch on the aluminum foil gradually widens, and when the focal length is 35 to 60mm, the cutting width is in the range of 0.03 to 0.05 mm. When the focal length was 90mm (comparative example 2), the kerf width was increased to 0.087mm, which is outside the scope of the present invention. In comparative example 1, the focusing lens type was changed to meniscus zinc selenide, and the kerf width was expanded to 0.100mm, which is also outside the scope of the present invention.

With the increase of the laser power and the pulse frequency, as in example 2, example 4 and comparative example 3, the kerf width is gradually increased, and if the laser power and the pulse frequency are too large, namely comparative example 3, the polyester film is excited through and loses the material value.

With increasing pulse width, as in comparative example 4, example 2, and example 5, the kerf width gradually decreased, but with too small a pulse width, comparative example 4, the polyester film was pulled through and lost material value.

With the increasing of the nitrogen pressure of the auxiliary gas, as in comparative example 5, example 6 and example 2, the width of the cutting seam is slightly larger, if the nitrogen pressure is too small, namely comparative example 5, the aluminum foils on the two sides of the cutting seam can be conducted, and the obtained product is not a discontinuous composite tape.

With the gradual increase of the cutting rate, the width of the cutting seam is gradually reduced like the example 2, the example 7 and the comparative example 6, but the cutting rate is too high, namely, the aluminum foil on two sides of the cutting seam can be conducted, and the obtained product is not a discontinuous composite tape.

With the gradual reduction of the thickness of the mylar in the composite tape, as in example 2, example 8, comparative example 7, the kerf width was essentially unchanged, and if the mylar thickness was too low, comparative example 7, the mylar was cut through, losing material value.

In summary, the kerf width can be reduced by adopting a proper focusing lens, and when the focusing lens is an aspheric zinc selenide lens and the focal length is 35-60 mm, the kerf width is within the range of 0.03-0.05 mm; the continuity of the aluminum foil cutting is realized by adjusting the process parameters such as laser power, pulse frequency, pulse width, auxiliary gas pressure, cutting rate and the like, and the non-continuous aluminum-plastic composite belt with the film not being penetrated and the aluminum foils on the two sides of the cutting seam not being conducted is obtained.

The present invention is illustrated by the above-mentioned examples, but the present invention is not limited to the above-mentioned detailed process equipment and process flow, i.e. it is not meant to imply that the present invention must rely on the above-mentioned detailed process equipment and process flow to be practiced. It should be understood by those skilled in the art that any modification of the present invention, equivalent substitutions of the raw materials of the product of the present invention, addition of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.

Claims

1. The preparation method of the discontinuous aluminum-plastic composite belt is characterized by comprising the following steps:

in the step 2), the specific process of laser cutting is as follows: generating energy by adopting a laser, irradiating the gathered high-density laser beam on an aluminum foil of the aluminum-plastic composite belt through a focusing lens, forming a cutting seam with the width of 0.03-0.05 mm along with the relative movement of the cutting head and the aluminum-plastic composite belt, blowing off the cut slag by coaxial gas, sucking dust and gasified gas, treating and discharging the dust and the gasified gas by a dust collecting device, and finishing the cutting of the aluminum foil of the aluminum-plastic composite belt;

the focusing lens is an aspheric zinc selenide lens, and the focal length is 35-60 mm;

2. The preparation method of claim 1, wherein in the step 1), the unreeling speed of the aluminum-plastic composite tape is 10-15 m/min.

3. The manufacturing method according to claim 1 or 2, wherein in the step 1), the aluminum-plastic composite tape is laid flat and fixed on a cutting table by vacuum adsorption.

4. The method according to claim 3, wherein the vacuum adsorption pressure in step 1) is 0.5 to 0.75 MPa.

5. The method of claim 1, wherein the laser is a fiber laser.

6. The production method according to claim 5, wherein the output wavelength of the fiber laser is 1064 nm.

7. The preparation method according to claim 5, wherein the laser power of the laser cutting is 48-50W.

8. The method according to claim 5, wherein the pulse frequency of the laser cutting is 125 to 180 kHz.

9. The method for preparing the optical fiber according to claim 5, wherein the pulse width of the laser cutting is 35-65 ns.

10. The method according to claim 1, wherein the coaxial gas is nitrogen, and the nitrogen pressure is 0.15 to 0.2 MPa.

11. The method according to claim 1, wherein the pressure of the sucked dust and the gasified gas is 0.28 to 0.43 MPa.

12. The method according to claim 1, wherein the cutting rate of the aluminum foil is 5 to 9 m/min.

13. The preparation method of claim 1, wherein in the step 3), the winding rate of the aluminum-plastic composite tape is 10-15 m/min.

14. A non-continuous aluminum-plastic composite belt obtained by the preparation method of any one of claims 1 to 13.

15. The discontinuous aluminum-plastic composite belt according to claim 14, comprising an aluminum foil layer and a polyester film layer, wherein the aluminum foil layer is provided with a plurality of slits with the width of 0.03-0.05 mm.

16. The non-continuous aluminum-plastic composite belt according to claim 15, wherein the aluminum foil layer has a thickness of 25 μm.

17. The non-continuous aluminum-plastic composite belt according to claim 15, wherein the polyester film layer is a PET layer.

18. The discontinuous aluminum-plastic composite belt according to claim 15, wherein the thickness of the polyester film layer is 22-25 μm.