CN112481835B - Production method of polyethylene film - Google Patents

Abstract

The invention provides a production method of a polyethylene film, which comprises the following steps of (1) passing a movable nozzle and a conveying mechanism; the movable nozzles are arranged above the conveying mechanism in sequence along the running direction of the conveying mechanism; the moving direction of the movable nozzle is vertical to the running direction of the conveying mechanism; in the running process of the conveying mechanism, each movable nozzle is controlled to carry out cross lapping according to a preset rule to obtain a corresponding polyethylene film, the polyethylene films with different widths can be produced according to actual needs, and in addition, the uniformity of the polyethylene films is easy to adjust.

Description

A kind of production method of polyethylene film

technical field

The invention relates to the technical field of non-woven fabrics, in particular to a method for producing polyethylene films.

Background technique

Non-woven fabric, also known as non-woven fabric, is composed of directional or random fibers. It is a new generation of environmentally friendly materials. It is moisture-proof, breathable, flexible, lightweight, non-combustible, easy to decompose, non-toxic and non-irritating, and can be recycled. It is internationally recognized as an environmentally friendly product that protects the earth's ecology. Widely used in shoemaking, tanning, mattress, decoration, chemical industry, printing, automobile, building materials, furniture civil engineering and other industries. The production process of polypropylene spunbond non-woven fabrics is simple and fast, and the raw materials are cheap and widely used in the production of non-woven fabrics.

However, when the existing polyethylene film production method is produced, the moving direction of the nozzle is the same as the conveying direction of the conveyor belt, so it can only produce polyethylene film with a fixed width, and cannot produce polyethylene films with different widths according to actual needs. The polyethylene film produced by the existing production equipment also has poor web-forming uniformity.

SUMMARY OF THE INVENTION

(1) Technical problems to be solved

In order to solve the above problems of the prior art, the present invention provides a method for producing polyethylene films, which can produce polyethylene films of different widths according to actual needs, and the uniformity of the polyethylene films is easy to adjust.

(2) Technical solutions

In order to achieve the above-mentioned purpose, the main technical scheme adopted in the present invention includes:

A production method of polyethylene film, comprising a movable nozzle and a conveying mechanism;

The number of the movable nozzles is multiple, and they are sequentially arranged above the conveying mechanism along the running direction of the conveying mechanism;

The moving direction of the movable nozzle is perpendicular to the running direction of the conveying mechanism;

During the operation of the conveying mechanism, each movable nozzle is controlled to perform cross-laying according to preset rules to obtain the corresponding polyethylene film.

(3) Beneficial effects

The beneficial effects of the present invention are: through the movable nozzle and the conveying mechanism; the number of the movable nozzles is multiple, and they are sequentially arranged above the conveying mechanism along the running direction of the conveying mechanism; the movable nozzles The moving direction of the conveyor is perpendicular to the running direction of the conveying mechanism; during the operation of the conveying mechanism, each movable nozzle is controlled to perform cross-laying according to preset rules to obtain the corresponding polyethylene film, which can be It is actually necessary to produce polyethylene films of different widths, and the uniformity of the polyethylene films is easy to adjust.

Description of drawings

Fig. 1 is the principle schematic diagram of the production method of the polyethylene film of the embodiment of the present invention;

Fig. 2 is the side view of the principle of the production method of the polyethylene film of the embodiment of the present invention;

Figure 3 is a schematic diagram of a produced web of an embodiment of the present invention.

[Description of reference numerals]

1: Nozzle; 11: First Nozzle; 12: Second Nozzle; 13: Third Nozzle; 14: Fourth Nozzle;

2: slide rail;

3: Conveyor mechanism; 31: Conveyor belt; 32 Roller.

Detailed ways

In order to better explain the present invention and facilitate understanding, the present invention will be described in detail below with reference to the accompanying drawings and through specific embodiments.

Please refer to Figures 1 and 2, a method for producing a polyethylene film, comprising a movable nozzle and a conveying mechanism 3;

The number of the movable nozzles is multiple, and they are sequentially arranged above the conveying mechanism 3 along the running direction of the conveying mechanism 3;

The moving direction of the movable nozzle is perpendicular to the running direction of the conveying mechanism 3;

During the operation of the conveying mechanism 3, each movable nozzle is controlled to perform cross-laying according to preset rules to obtain the corresponding polyethylene film.

The movable nozzle includes a nozzle 1 and a slide rail 1;

The nozzle 1 is arranged on the slide rail 1 and is slidably connected to the slide rail 1;

The nozzle 1 is arranged above the conveying mechanism 3 , and the sliding rail 1 is connected with the conveying mechanism 3 .

The length of the sliding rail 1 can be adjusted, and the moving speed and time of the nozzle 1 on the sliding rail 1 can be adjusted.

The conveying mechanism 3 includes a conveying belt 31 and a roller 32, and the conveying speed of the conveying belt 31 is adjustable.

Said controlling each movable nozzle to perform cross-laying according to preset rules, and obtaining the corresponding polyethylene film specifically includes:

The moving range of each movable nozzle is controlled separately for cross-laying to obtain a corresponding wide-width polyethylene film.

Said controlling each movable nozzle to perform cross-laying according to preset rules, and obtaining the corresponding polyethylene film specifically includes:

The number of movable nozzles and the moving speed of each movable nozzle are respectively controlled for cross-laying to obtain the corresponding polyethylene film.

Specifically, it is assumed that the ejection amount (denoted by M) of a single nozzle is 250 grams per minute, and the specific ejection amount will vary due to the size of the orifice; ) is 0.6 meters, and the laying width will vary according to the parameter settings of the nozzle (nozzle hole size, wire swing frequency, etc.); assuming that the number of nozzles (represented by the letter N) is 4, two adjacent The spacing between the nozzles (denoted by the letter D) is 1.2 meters.

According to the conditions mentioned above, how to use the method provided by the present invention to make a uniform sheet with a total width (represented by letter Z) of 2 meters and a net weight (represented by letter G) of 70 grams per square meter of polyethylene film fiber mesh.

According to the above conditions, since 4 nozzles are set, it is necessary to let the 4 nozzles move in an orderly manner in order to ensure that the gram weight of the laid-up fiber web is the same across the entire width. Please refer to the fiber web formed in FIG. 3 from the first nozzle 11, the second nozzle 12, the third nozzle 13 and the fourth nozzle 14. It can be seen from the schematic diagram 3 that the laminated fiber web has two layers at each position. Therefore, as long as the moving speed of each nozzle is the same and the speed of the bottom curtain is unchanged, the gram weight of the large wide fiber web obtained is the same everywhere. The number of layers to be stacked can be set according to specific equipment parameters, and two layers are set in this embodiment for calculation purposes only.

According to the above conditions, to make a polyethylene film fiber web with a total width of 2 meters and a net weight of 70 per square meter, it is necessary to adjust the forward speed of the bottom curtain and the moving speed of the nozzle; by calculating , the forward speed of the bottom curtain (represented by the letter V1) is:

V1=[N*M]/[G*Z]=(250*4)/(70*2)=7.14m/min;

The moving speed of the nozzle (represented by the letter V2) is:

V2=V1/L=[N*M]/[G*Z]/L=(250*4)/(70*2*0.6)=11.90m/min;

According to the embodiment of the present invention, since the distance between adjacent nozzles is larger than the width of the laying width of a single nozzle (D>L), according to schematic diagram 3, in order to ensure that the nets sprayed by adjacent nozzles are just aligned, the The round-trip movement cannot be completely synchronized, and a certain delay time (denoted by T) needs to be set. Therefore, the turning point of each nozzle on the same side of the bottom curtain (the left or right side of the bottom curtain) can be set as the starting point of each nozzle. When the first nozzle 11 starts to move from the starting point at the speed of V2, at the same time the bottom If the curtain continues to advance at the speed of V1, the second nozzle 12 needs to start moving after a period of time (ie delay time T) after the first nozzle 11 starts to move from the starting point, in order to ensure that the first nozzle 11 and the second nozzle 12 The edges of the laid net are just aligned. By calculation, T=[D-L]/V1=(1.2-0.6)/7.14=0.084 minutes=5.04 seconds. By analogy, the third nozzle 13 needs to start moving from the starting point after the second nozzle 12 starts to move from the starting point, and the fourth nozzle 14 needs to start moving from the starting point after the third nozzle 13 starts moving from the starting point. Move the starting point.

Under the condition that the ejection amount of a single nozzle, the laying width of a single nozzle, the number of nozzles, the distance between two adjacent nozzles, and the number of layers of laying remain unchanged, if you need to adjust the gram weight of the net, Then you only need to adjust the forward speed of the bottom curtain, the moving speed of the nozzles and the delay time between the nozzles, no need to modify the hardware equipment; if you need the total width of the web, you only need to adjust the forward speed of the bottom curtain. , the moving speed of the nozzle and the delay time between the nozzles, and adjust the round-trip point of the nozzle at the same time, no need to modify the hardware equipment.

The above descriptions are only examples of the present invention, and are not intended to limit the scope of the present invention. Any equivalent transformations made by using the contents of the description and drawings of the present invention, or directly or indirectly applied in related technical fields, are similarly included in the within the scope of patent protection of the present invention.

Claims (4)

1. a production method of polyethylene film, is characterized in that, comprises movable nozzle and conveying mechanism; The number of the movable nozzles is multiple, and they are sequentially arranged above the conveying mechanism along the running direction of the conveying mechanism; The moving direction of the movable nozzle is perpendicular to the running direction of the conveying mechanism; During the operation of the conveying mechanism, each movable nozzle is controlled to perform cross-laying according to preset rules to obtain the corresponding polyethylene film; Said controlling each movable nozzle to perform cross-laying according to preset rules, and obtaining the corresponding polyethylene film specifically includes: Controlling the moving range of each movable nozzle separately for cross-laying to obtain a corresponding wide-width polyethylene film; Control the number of movable nozzles and the moving speed of each movable nozzle respectively to carry out cross-laying to obtain the corresponding polyethylene film; Adjust the forward speed of the bottom curtain and the moving speed of the nozzle; through calculation, the forward speed of the bottom curtain V1=[N*M]/[G*Z]; The moving speed of the nozzle V2=V1/L=[N*M]/[G*Z]/L; Among them, M is the ejection amount of a single nozzle; N is the number of nozzles; L is the laying width of a single nozzle; G is the gram weight; Z is the total width; The turning point of each nozzle on the same side of the bottom curtain is set as the starting point of each nozzle. When the first nozzle starts to move from the starting point at the speed of V2, and the bottom curtain keeps advancing at the speed of V1, the second The nozzle needs to start moving after T time after the first nozzle starts to move from the starting point, to ensure that the edges of the net laid by the first nozzle and the second nozzle are just aligned. By calculating T=[D-L]/V1, where D is the distance between two adjacent nozzles. 2. The method for producing polyethylene film according to claim 1, wherein the movable nozzle comprises a nozzle and a slide rail; the nozzle is arranged on the slide rail and is slidably connected with the slide rail; The nozzle is arranged above the conveying mechanism, and the sliding rail is connected with the conveying mechanism. 3 . The method for producing polyethylene film according to claim 2 , wherein the length of the sliding rail is adjustable, and the moving speed and time of the nozzle on the sliding rail are adjustable. 4 . 4 . The method for producing polyethylene film according to claim 1 , wherein the conveying mechanism comprises a conveying belt and a roller, and the conveying speed of the conveying belt is adjustable. 5 .

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