Preparation device and control method of antistatic protective breathable film

Abstract

The application relates to the technical field of anti-static protective breathable film preparation, in particular to a preparation equipment and a control method of an anti-static protective breathable film. The preparation equipment of the anti-static protective breathable film comprises a feeding unit, an extruding unit, a film blowing unit, a winding unit and a control unit. The extruding unit comprises an extruding cylinder, a spiral rod is arranged in the extruding cylinder, and a plurality of annular heating areas are arranged on the inner wall of the extruding cylinder; the control unit calculates the feeding end temperature, sets the temperature of each heating area based on the calculated feeding end temperature and the set extruding end temperature; and the control unit adjusts the temperature of the heating area adjacent to the fault heating area to compensate the temperature of the fault heating area. When any heating area fails, the temperature of the fault heating area can be compensated by adjusting the temperature of the adjacent heating area, the production process does not need to be interrupted, and the production efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of preparation of antistatic protective breathable film, and particularly relates to a preparation device and a control method of antistatic protective breathable film. BACKGROUND

[0002] The antistatic film is obtained by adding an antistatic agent into a film base material. The antistatic agent can effectively absorb moisture on the surface of a product and in air, and then neutralize the moisture by static electricity, so as to achieve the antistatic effect. The antistatic agent is mostly pp / pe raw material. Before blowing, the antistatic agent is added and uniformly mixed, and then plasticized by a screw, and then a film is blown. After the product is obtained, the antistatic agent is distributed in the resin, and the antistatic agent is a low-molecular-weight surfactant, has hydrophilicity and hygroscopicity, and is easy to migrate from the resin to the surface of the product to form a moisture layer, so as to achieve the effect of static discharge.

[0003] Chinese patent publication No. CN1886248B discloses a method for preparing a breathable elastic polyolefin film, which comprises the following steps: blowing a mixture of an olefin, a styrene thermoplastic elastomer and a filler to generate pores by stretching, extruding the tube into a flat film, heating the flat film to a softening point, extruding the flat film, cooling the flat film to 8-30 DEG C, and stretching the film in the transverse and / or longitudinal direction to have breathability. The application also discloses a device for preparing a breathable elastic film and the use of the mixture of an olefin, a styrene thermoplastic elastomer and a filler for preparing a breathable elastic film.

[0004] However, the prior art has a problem that when the raw material is melted, the whole heating area is designed in an integral manner, and when a fault occurs in the heating area, the production process needs to be interrupted to repair the heating area, thereby reducing the production efficiency. SUMMARY

[0005] Therefore, the present application provides a preparation device and a control method of antistatic protective breathable film, so as to overcome the problem in the prior art that the whole heating area is designed in an integral manner, and when a fault occurs in the heating area, the production process needs to be interrupted to repair the heating area, thereby reducing the production efficiency.

[0006] To achieve the above object, in one aspect, the present application provides a preparation device of antistatic protective breathable film, comprising:

[0007] The feeding unit is used to feed the uniformly mixed raw material to the extruding unit according to the set feeding amount per unit time, and the raw material comprises 3% by weight of the antistatic agent;

[0008] an extruding unit connected with the feeding unit, comprising an extruding cylinder, a screw rod arranged in the extruding cylinder, and a plurality of annular heating areas arranged on the inner wall of the extruding cylinder; the extruding cylinder comprises a feeding end and an extruding end, the feeding end is set with a feeding end temperature, and the extruding end is set with an extruding end temperature; the extruding unit melts the raw materials through the heating areas and extrudes the melt through the rotation of the screw rod;

[0009] a film blowing unit connected with the extruding unit, used for blowing film from the melt extruded by the extruding unit;

[0010] a winding unit connected with the film blowing unit, used for winding the cooled film;

[0011] a control unit connected with the feeding unit and the extruding unit, used for determining the feeding amount level of the feeding amount per unit time according to a standard feeding amount, calculating the feeding amount difference between the feeding amount per unit time and the standard feeding amount to determine the feeding end temperature adjustment coefficient selected when calculating the feeding end temperature at the second feeding amount level, and calculating the feeding end temperature; the control unit compensates the temperature of the fault heating area by adjusting the temperature of the heating area adjacent to the fault heating area and / or the temperature of the next adjacent heating area when the temperature of the fault heating area does not meet the standard.

[0012] Further, the control unit is provided with a standard feeding amount, based on which the feeding amount level of the feeding amount per unit time is determined, and if it is the second feeding amount level, it is determined that the feeding end temperature needs to be calculated;

[0013] The second feeding amount level meets the condition that the feeding amount per unit time is not equal to the standard feeding amount.

[0014] Further, the control unit is provided with a standard feeding end temperature, based on which two calculation methods of the feeding end temperature are determined;

[0015] The feeding end temperature determined by the first calculation method is less than the standard feeding end temperature, and the feeding end temperature determined by the second calculation method is greater than the standard feeding end temperature;

[0016] The first calculation method meets the condition that the feeding amount per unit time is less than the standard feeding amount, and the second calculation method meets the condition that the feeding amount per unit time is greater than the standard feeding amount.

[0017] Further, the control unit is provided with a plurality of feeding end temperature adjustment coefficients, and the feeding end temperature adjustment coefficient selected by any of the calculation methods is different when the feeding end temperature is calculated;

[0018] The control unit calculates a feeding amount difference between the feeding amount per unit time and the standard feeding amount, and determines a selected feeding end temperature adjustment coefficient according to the feeding amount difference.

[0019] Further, the control unit calculates a temperature difference between the extrusion end temperature and the feeding end temperature, calculates a temperature interval between the heating zones based on the temperature difference, and sets the temperature of each heating zone based on the temperature interval.

[0020] Further, the control unit records a heating zone with a temperature not meeting the standard as a fault heating zone, and the control unit has two compensation modes for compensating the temperature of the fault heating zone according to a fault temperature difference.

[0021] The fault temperature difference is a difference between a set temperature of the fault heating zone and an actual temperature of the fault heating zone.

[0022] Further, when the first compensation mode is adopted, the control unit adjusts the temperature of the adjacent heating zone to compensate the temperature of the fault heating zone.

[0023] Or,

[0024] When the second compensation mode is adopted, the control unit adjusts the temperature of the adjacent heating zone and the temperature of the next adjacent heating zone to compensate the temperature of the fault heating zone.

[0025] The next adjacent heating zone is a heating zone adjacent to the adjacent heating zone.

[0026] Further, in the first compensation mode, the control unit sets the temperature of the first adjacent zone = the set temperature of the first adjacent zone + the fault temperature difference × α, and sets the temperature of the second adjacent zone = the set temperature of the second adjacent zone + the fault temperature difference × β.

[0027] The first compensation coefficient α and the second compensation coefficient β are set, the first adjacent zone is a zone adjacent to the fault heating zone and having a temperature higher than that of the fault heating zone, and the second adjacent zone is a zone adjacent to the fault heating zone and having a temperature lower than that of the fault heating zone.

[0028] Further, in the second compensation mode, the control unit sets the temperature of the first adjacent zone = the set temperature of the first adjacent zone + the fault temperature difference × 3α × β, sets the temperature of the second adjacent zone = the set temperature of the second adjacent zone + the fault temperature difference × 2β, sets the temperature of the first next adjacent zone = the set temperature of the first next adjacent zone + the fault temperature difference × 4α, and sets the temperature of the second next adjacent zone = the set temperature of the second next adjacent zone + the fault temperature difference × 3α. 2 2 ​, set the temperature of the second adjacent area = the set temperature of the second adjacent area + the fault temperature difference * 3a * beta;

[0029] The first adjacent area is adjacent to the first adjacent area, and the second adjacent area is adjacent to the second adjacent area.

[0030] In another aspect, the application also provides a control method of an anti-static protective breathable film preparation device, comprising:

[0031] Step S1, the control unit determines the feed amount level of the unit time feed amount to determine the feed end temperature;

[0032] Step S2, the control unit calculates the feed end temperature when the unit time feed amount is at the second feed amount level;

[0033] Step S3, the control unit sets the temperature of each heating area according to the calculated feed end temperature and the set extrusion end temperature;

[0034] Step S4, if the temperature of any heating area does not meet the standard, the control unit records the heating area with the temperature that does not meet the standard as a fault heating area, and compensates for the temperature of the fault heating area by adjusting the temperature of the adjacent heating area and / or the temperature of the second adjacent heating area.

[0035] Compared with the prior art, the application has the beneficial effects that by setting several heating areas and setting gradient temperatures for the heating areas, the heating areas gradually increase from the feed end temperature to the extrusion end temperature, compared with the prior art in which the heating areas are not divided, the application can save electric energy and improve the heating efficiency of the heating areas by dividing the heating areas; and when any heating area fails, the temperature of the fault heating area can be compensated by adjusting the temperature of the adjacent heating area, without interrupting the production process, thereby improving the production efficiency.

[0036] Further, the control unit of the application sets a standard feed end temperature and a standard feed amount, in actual application, the control unit calculates the feed end temperature according to the unit time feed amount, so that the unit time feed amount can be extruded into uniform molten body at the set feed end temperature, on the one hand, avoiding insufficient melting of raw materials due to insufficient temperature, and on the other hand, avoiding energy waste due to excessive temperature.

[0037] Further, the application calculates the temperature interval according to the temperature difference between the extrusion end temperature and the feed end temperature, and calculates the temperature of each heating area according to the temperature interval, and sets the temperature of each heating area as a temperature rising process that gradually increases according to the temperature interval, by the above technical solution, electric energy can be saved and the heating efficiency of the heating area can be improved.

[0038] Further, the application compensates the temperature of the fault heating area by controlling the temperature of the adjacent heating area without interrupting the production process when any heating area fails, guarantees sufficient melting of the raw material and improves the production efficiency.

[0039] Further, the application compensates the temperature of the fault heating area by controlling the temperature of the adjacent heating area without interrupting the production process when any heating area fails, guarantees sufficient melting of the raw material and improves the production efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0040] Figure 1 Figure 1 is a schematic diagram of the preparation equipment of the antistatic protective breathable film according to the embodiment of the application;

[0041] Figure 2 Figure 1 is a schematic diagram of the preparation equipment of the antistatic protective breathable film according to the embodiment of the application;

[0042] Figure 3 Figure 1 is a schematic diagram of the preparation equipment of the antistatic protective breathable film according to the embodiment of the application; DETAILED DESCRIPTION

[0043] In order to make the objects and advantages of the application clearer, the application will be further described below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the application and not to limit the application.

[0044] The preferred embodiments of the application will be described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the application and not to limit the protection scope of the application.

[0045] It should be noted that in the description of the application, the terms indicating the direction or position relationship such as “up”, “down”, “left”, “right”, “inner” and “outer” are based on the direction or position relationship shown in the drawings, which is only for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the application.

[0046] Moreover, it needs to be explained that in the description of the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood in a broad sense and for example, can be fixed connection, can also be detachable connection, or integral connection; can be mechanical connection, can also be electrical connection; can be direct connection, can also be indirect connection through intermediate medium, can be internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0047] Please refer to Figure 1 and Figure 2 , Figure 1 is a schematic diagram of the preparation equipment of the antistatic protective breathable film according to the embodiment of the present application, Figure 2 is a structural block diagram of the preparation equipment of the antistatic protective breathable film according to the embodiment of the present application, and the preparation equipment of the antistatic protective breathable film according to the present application comprises:

[0048] The feeding unit 1 is used to feed the uniformly mixed raw materials to the extrusion unit according to the set feeding amount per unit time, and the raw materials comprise 3% by weight of antistatic agent;

[0049] The extrusion unit 2 is connected with the feeding unit 1 and comprises an extrusion barrel, a screw rod is arranged in the extrusion barrel, and a plurality of annular heating areas 5 are arranged on the inner wall of the extrusion barrel; the extrusion barrel comprises a feeding end and an extrusion end, the feeding end temperature is set for the feeding end, and the extrusion end temperature is set for the extrusion end; the extrusion unit melts the raw materials through each heating area 5 and extrudes the melt through the rotation of the screw rod;

[0050] The film blowing unit 3 is connected with the extrusion unit 2 and is used to blow the melt extruded by the extrusion unit 2 into a film;

[0051] The winding unit 4 is connected with the film blowing unit 3 and is used to wind the cooled film;

[0052] The control unit is connected with the feeding unit 1 and the extrusion unit 2 respectively, is used to determine the feeding amount level of the feeding amount per unit time according to the standard feeding amount, calculate the feeding amount difference between the feeding amount per unit time and the standard feeding amount to determine the feeding end temperature adjustment coefficient selected when calculating the feeding end temperature at the second feeding amount level, and calculate the feeding end temperature; based on the calculated feeding end temperature and the set extrusion end temperature, the temperature interval between the heating areas is calculated to determine the temperature of each heating area; the control unit compensates the temperature of the fault heating area by adjusting the temperature of the adjacent heating area and / or the temperature of the next adjacent heating area of the fault heating area when the temperature of the fault heating area does not meet the standard.

[0053] The application sets several heating areas, and sets gradient temperature for the heating areas, the temperature of the heating areas gradually increases from the feeding end to the extrusion end, compared with the prior art that the heating area is not divided, the application can save electric energy and improve the heating efficiency of the heating area by dividing the heating area; and when any heating area fails, the temperature of the failed heating area can be compensated by adjusting the temperature of the adjacent heating area, without interrupting the production process, thereby improving the production efficiency.

[0054] Specifically, the control unit is provided with a standard feeding amount and a standard feeding end temperature, the standard feeding amount corresponds to the standard feeding end temperature, and the control unit determines the feeding end temperature according to the feeding amount per unit time;

[0055] If the feeding amount per unit time is at a first feeding amount level, the control unit determines to set the feeding end temperature Tj as the standard feeding end temperature;

[0056] If the feeding amount per unit time is at a second feeding amount level, the control unit determines to calculate the feeding end temperature according to the feeding amount per unit time;

[0057] The first feeding amount level satisfies that the feeding amount per unit time is equal to the standard feeding amount, and the second feeding amount level satisfies that the feeding amount per unit time is not equal to the standard feeding amount.

[0058] In the embodiment, the standard feeding amount is set as 80% of the maximum feeding amount per unit time of the feeding unit, and the extrusion efficiency of the extrusion unit is set to be adaptable to the maximum feeding amount per unit time of the feeding unit. The standard feeding end temperature corresponds to the standard feeding amount, and in the embodiment, the temperature of the extrusion end is set as 250°, and the standard feeding end temperature is just enough to extrude uniform molten body at the extrusion end at the temperature of the standard feeding amount.

[0059] Specifically, the control unit is provided with a calculation method of the feeding end temperature;

[0060] The first calculation method is to set the feeding end temperature Tj=T0×ex;

[0061] The second calculation method is to set the feeding end temperature Tj=T0×(2-ex);

[0062] The first calculation method satisfies that the feeding amount per unit time is less than the standard feeding amount, and the second calculation method satisfies that the feeding amount per unit time is greater than the standard feeding amount;

[0063] Wherein, T0 is the standard feeding end temperature, x=1, 2, 3, e1 is the first feeding end temperature adjustment coefficient, e2 is the second feeding end temperature adjustment coefficient, e3 is the third feeding end temperature adjustment coefficient, and 0.8

[0064] In this embodiment, e1=0.85, e2=0.9, and e3=0.95 are set.

[0065] The range of the feeding end temperature adjustment coefficient obtained according to the production experience is 0.8

[0066] Specifically, the control unit calculates a feeding amount difference value of the unit time feeding amount and the standard feeding amount, and determines the selected feeding end temperature adjustment coefficient according to the feeding amount difference value, and sets the feeding amount difference value = | unit time feeding amount - standard feeding amount |. The control unit is provided with a first preset feeding amount difference value and a second preset feeding amount difference value, and the first preset feeding amount difference value is less than the second preset feeding amount difference value. The first preset feeding amount difference value and the second preset feeding amount difference value are used to determine the difference level of the feeding amount difference value.

[0067] If the feeding amount difference value is at the first feeding amount difference level, the control unit determines to select the first feeding end temperature adjustment coefficient to calculate the feeding end temperature.

[0068] If the feeding amount difference value is at the second feeding amount difference level, the control unit determines to select the second feeding end temperature adjustment coefficient to calculate the feeding end temperature.

[0069] If the feeding amount difference value is at the third feeding amount difference level, the control unit determines to select the third feeding end temperature adjustment coefficient to calculate the feeding end temperature.

[0070] The first feeding amount difference level satisfies that the feeding amount difference value is less than the first preset feeding amount difference value, the second feeding amount difference level satisfies that the feeding amount difference value is greater than or equal to the first preset feeding amount difference value and less than the second preset feeding amount difference value, and the third feeding amount difference level satisfies that the feeding amount difference value is greater than or equal to the second preset feeding amount difference value.

[0071] The control unit sets the standard feeding end temperature and the standard feeding amount. In actual application, the control unit calculates the feeding end temperature according to the unit time feeding amount, so that the unit time feeding amount can be uniformly extruded at the set feeding end temperature. On the one hand, it avoids insufficient melting of raw materials due to insufficient temperature, and on the other hand, it avoids energy waste due to excessive temperature.

[0072] Specifically, the control unit calculates a temperature difference value of the extrusion end temperature and the feeding end temperature, and sets the temperature difference value = extrusion end temperature - feeding end temperature. The control unit calculates the temperature interval between the heating areas according to the temperature difference value, and sets the temperature interval = temperature difference value / (n + 1), wherein n is the number of heating areas.

[0073] The heating zones are sequentially recorded as a first heating zone, a second heating zone,..., and an n-th heating zone from the feeding end to the extruding end;

[0074] The control unit sets the temperature of the first heating zone as the feeding end temperature + a temperature interval;

[0075] The control unit sets the temperature of the second heating zone as the feeding end temperature + 2x the temperature interval;

[0076] The control unit sets the temperature of the n-th heating zone as the feeding end temperature + nx the temperature interval.

[0077] The present application calculates the temperature interval according to the temperature difference between the extruding end temperature and the feeding end temperature, and calculates the temperature of each heating zone according to the temperature interval, and sets the temperature of each heating zone as a temperature rising process with a temperature interval gradient, thereby saving electric energy and improving the heating efficiency of the heating zone.

[0078] Specifically, if the temperature of any heating zone detected does not meet the standard, the control unit records the heating zone with the temperature not meeting the standard as a fault heating zone, and adjusts the temperature of the heating zone adjacent to the fault heating zone to compensate for the temperature of the fault heating zone, and the control unit is provided with two compensation modes for compensating for the temperature of the fault heating zone according to the fault temperature difference;

[0079] The first compensation mode is that the control unit adjusts the temperature of the adjacent heating zone to compensate for the temperature of the fault heating zone;

[0080] The second compensation mode is that the control unit adjusts the temperature of the adjacent heating zone and the temperature of the next adjacent heating zone to compensate for the temperature of the fault heating zone;

[0081] The next adjacent heating zone is the heating zone adjacent to the adjacent heating zone.

[0082] In the embodiment, the temperature of each heating zone can be detected by setting a temperature sensor in the heating zone, or other temperature detection methods such as an infrared temperature detector.

[0083] If the temperature of any heating zone is less than 0.98x the corresponding set temperature, it is determined that the temperature of the heating zone does not meet the standard.

[0084] Specifically, the control unit calculates a fault temperature difference of the set temperature of the fault heating area and the actual temperature of the fault heating area, sets the fault temperature difference = the set temperature of the fault heating area - the actual temperature of the fault heating area, and determines a compensation mode for compensating the temperature of the fault heating area according to the difference level of the fault temperature difference;

[0085] If the fault temperature difference is at a first fault temperature difference level, the control unit determines to select a first compensation mode;

[0086] If the fault temperature difference is at a second fault temperature difference level, the control unit determines to select a second compensation mode;

[0087] The first fault temperature difference level satisfies that the fault temperature difference is less than 1 / 2×the set temperature of the fault heating area; and the second fault temperature difference level satisfies that the fault temperature difference is greater than or equal to 1 / 2×the set temperature of the fault heating area.

[0088] Specifically, in the first compensation mode, the control unit calculates the temperature of the first adjacent area according to the formula: set the temperature of the first adjacent area = the set temperature of the first adjacent area + the fault temperature difference × α, and calculates the temperature of the second adjacent area according to the formula: set the temperature of the second adjacent area = the set temperature of the second adjacent area + the fault temperature difference × β;

[0089] Wherein, α is a first compensation coefficient, β is a second compensation coefficient, the first adjacent area is a temperature area adjacent to the fault heating area and having a temperature higher than that of the fault heating area, and the second adjacent area is a temperature area adjacent to the fault heating area and having a temperature lower than that of the fault heating area.

[0090] The temperature of the first adjacent area is greater than the temperature of the second adjacent area.

[0091] The embodiment sets 0.3 < α < β < 0.8, and preferably α = 0.4 and β = 0.6. According to production experience, when the values of the first compensation coefficient and the second compensation coefficient are set to be in the range of 0.3 < α < β < 0.8, the temperature compensation for the fault heating area not only makes the temperature transition of each heating area more stable and obtains a better texture uniform molten body, but also has a higher utilization efficiency of electric energy.

[0092] Specifically, in the second compensation mode, the control unit calculates the temperature of the first adjacent area according to the formula: set the temperature of the first adjacent area = the set temperature of the first adjacent area + the fault temperature difference × 3α×β, and calculates the temperature of the second adjacent area according to the formula: set the temperature of the second adjacent area = the set temperature of the second adjacent area + the fault temperature difference × 2β2 The control unit calculates the temperature of the first adjacent area according to the following formula: set temperature of the first adjacent area = set temperature of the first adjacent area + fault temperature difference * 4a 2 The control unit calculates the temperature of the second adjacent area according to the following formula: set temperature of the second adjacent area = set temperature of the second adjacent area + fault temperature difference * 3a * b

[0093] The first adjacent area is adjacent to the first adjacent area, and the second adjacent area is adjacent to the second adjacent area.

[0094] The present application compensates the temperature of the fault heating area by controlling the temperature of the adjacent heating area when a fault occurs in any heating area, ensures sufficient melting of the raw material, and improves the production efficiency.

[0095] The present application compensates the temperature of the fault heating area by adopting the first adjustment mode when the actual temperature of the fault heating area is higher than 1 / 2 * set temperature of the fault heating area, and compensates the temperature of the fault heating area by adopting the second adjustment mode when the actual temperature of the fault heating area is lower than 1 / 2 * set temperature of the fault heating area, thereby improving the uniformity of the temperature gradient of the heating area when there is a fault heating area by setting different adjustment modes.

[0096] Please refer to Figure 3 The control method of the anti-static protective breathable film preparation equipment of the present application comprises:

[0097] Step S1, the control unit determines the feed amount level of the unit time feed amount to determine the feed end temperature;

[0098] Step S2, the control unit calculates the feed end temperature when the unit time feed amount is at the second feed amount level;

[0099] Step S3, the control unit sets the temperature of each heating area according to the calculated feed end temperature and the set extrusion end temperature;

[0100] Step S4, if the temperature of any heating area does not meet the standard, the control unit records the heating area with the temperature not meeting the standard as a fault heating area, and compensates the temperature of the fault heating area by adjusting the temperature of the adjacent heating area and / or the temperature of the second adjacent heating area of the fault heating area.

[0101] So far, the technical solutions of the present application have been described in combination with the preferred embodiments shown in the drawings, but it is easy for those skilled in the art to understand that the protection scope of the present application is obviously not limited to these specific embodiments. Those skilled in the art can make equivalent changes or replacements to the related technical features without departing from the principles of the present application, and the technical solutions after the changes or replacements will all fall within the protection scope of the present application.

[0102] The above only describes the preferred embodiments of the present application and is not used to limit the present application; the present application can have various changes and variations for those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A device for preparing an antistatic protective breathable membrane, characterized in that, include: The feeding unit is used to feed uniformly mixed raw materials to the extrusion unit according to a set feed rate per unit time, the raw materials including 3% by weight of antistatic agent. An extrusion unit, connected to the feeding unit, includes an extrusion cylinder with a screw rod inside and several annular heating zones on the inner wall of the extrusion cylinder. The extrusion cylinder includes a feeding end and an extrusion end, with the feeding end having a set feeding end temperature and the extrusion end having a set extrusion end temperature. The extrusion unit melts the raw material through each heating zone and extrudes the melt by rotating the screw rod. A blown film unit, which is connected to the extrusion unit, is used to blow the melt extruded by the extrusion unit into a film; A winding unit, which is connected to the blown film unit, is used to wind up the cooled film; A control unit, connected to both the feeding unit and the extrusion unit, is used to determine the feed rate level of the feed rate per unit time based on the standard feed rate, and at the second feed rate level, calculate the feed rate difference between the feed rate per unit time and the standard feed rate to determine the feed end temperature adjustment coefficient selected when calculating the feed end temperature, and calculate the feed end temperature. Based on the calculated feed end temperature and the set extrusion end temperature, the control unit calculates the temperature interval between the heating zones to determine the temperature of each heating zone. For faulty heating zones whose temperatures do not meet the standard, the control unit compensates for the temperature of the faulty heating zone by adjusting the temperature of the adjacent heating zone and / or the next adjacent heating zone. The second feed rate level satisfies the condition that the feed rate per unit time is not equal to the standard feed rate.

2. The equipment for preparing the antistatic protective breathable membrane according to claim 1, characterized in that, The control unit is equipped with a standard feed rate. Based on the standard feed rate, the feed rate level of the feed rate per unit time is determined. If it is the second feed rate level, it is determined that the feed end temperature needs to be calculated.

3. The equipment for preparing the antistatic protective breathable membrane according to claim 2, characterized in that, The control unit is equipped with a standard feed end temperature, and two calculation methods are used to determine the feed end temperature based on the standard feed end temperature; Among them, the feed end temperature determined by the first calculation method is lower than the standard feed end temperature, and the feed end temperature determined by the second calculation method is higher than the standard feed end temperature. The first calculation method satisfies that the feed rate per unit time is less than the standard feed rate, while the second calculation method satisfies that the feed rate per unit time is greater than the standard feed rate.

4. The equipment for preparing the antistatic protective breathable membrane according to claim 3, characterized in that, The control unit is provided with several feed end temperature adjustment coefficients. When calculating the feed end temperature, the feed end temperature adjustment coefficients selected by any of the calculation methods are different. The control unit calculates the difference between the feed rate per unit time and the standard feed rate, and determines the selected feed end temperature adjustment coefficient based on the feed rate difference.

5. The equipment for preparing the antistatic protective breathable membrane according to claim 4, characterized in that, The control unit calculates the temperature difference between the extrusion end temperature and the feed end temperature, calculates the temperature interval between the heating zones based on the temperature difference, and sets the temperature of each heating zone based on the temperature interval.

6. The equipment for preparing the antistatic protective breathable membrane according to claim 5, characterized in that, The control unit records heating areas whose temperatures do not meet the standard as faulty heating areas. The control unit is equipped with two compensation methods to compensate for the temperature of faulty heating areas based on the faulty temperature difference. The fault temperature difference is the difference between the set temperature of the fault heating zone and the actual temperature of the fault heating zone.

7. The equipment for preparing the antistatic protective breathable membrane according to claim 6, characterized in that, When the first compensation method is adopted, the control unit adjusts the temperature of the adjacent heating area to compensate for the temperature of the faulty heating area; or, When the second compensation method is adopted, the control unit simultaneously adjusts the temperature of the adjacent heating area and the temperature of the next adjacent heating area to compensate for the temperature of the faulty heating area. The next adjacent heating region is the heating region that is adjacent to the adjacent heating region.

8. The equipment for preparing the antistatic protective breathable membrane according to claim 7, characterized in that, In the first compensation method, the control unit sets the temperature of the first adjacent area to be equal to the set temperature of the first adjacent area plus the fault temperature difference × α, and sets the temperature of the second adjacent area to be equal to the set temperature of the second adjacent area plus the fault temperature difference × β. Wherein, α is the first compensation coefficient, β is the second compensation coefficient, the first adjacent region is the temperature region adjacent to the fault heating region that is higher than the fault heating region, and the second adjacent region is the temperature region adjacent to the fault heating region that is lower than the fault heating region.

9. The equipment for preparing the antistatic protective breathable membrane according to claim 8, characterized in that, In the second compensation method, the control unit sets the temperature of the first adjacent area to be equal to the set temperature of the first adjacent area plus the fault temperature difference × 3α × β, and sets the temperature of the second adjacent area to be equal to the set temperature of the second adjacent area plus the fault temperature difference × 2β. 2 The temperature of the first neighboring area is set as follows: (Set temperature of the first neighboring area + Fault temperature difference) × 4α 2 Set the temperature of the second neighboring area = the set temperature of the second neighboring area + the fault temperature difference × 3α × β; The first neighboring region is adjacent to the first adjacent region, and the second neighboring region is adjacent to the second adjacent region.

10. A control method applied to the device according to any one of claims 1-9, characterized in that, include: Step S1: The control unit determines the feed rate level per unit time to determine the feed end temperature; Step S2, the control unit calculates the feed end temperature when the feed rate per unit time is at the second feed rate level; Step S3: The control unit sets the temperature of each heating zone according to the calculated feed end temperature and the set extrusion end temperature; Step S4: If the temperature of any heating zone does not meet the standard, the control unit records the heating zone with the non-standard temperature as a faulty heating zone, and compensates for the temperature of the faulty heating zone by adjusting the temperature of the heating zone adjacent to the faulty heating zone and / or the temperature of the next adjacent heating zone.

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