Flow control method and flow control system in viscosity fluctuation state of ink

Abstract

The present application belongs to the technical field of pump, and particularly relates to a flow control method and a flow control system under an ink viscosity fluctuation state. The flow control method under the ink viscosity fluctuation state comprises the following steps: continuously conveying the ink by using a bellows pump; adjusting the air pressure value of a pneumatic regulator according to the ink viscosity data about to enter the bellows, so that the bellows absorbs the ink at a constant flow rate; adjusting the air pressure value of the pneumatic regulator according to the ink viscosity data about to flow out of the bellows, so that the bellows conveys the ink at a constant flow rate; wherein the flow rate of the ink absorption is the same as the flow rate of the ink conveying; the flow control method and the flow control system under the ink viscosity fluctuation state can collect the ink viscosity data about to enter the bellows in real time, and adjust the air pressure value of the pneumatic regulator according to the collected ink viscosity data, so that the pneumatic regulator can drive the bellows to absorb or convey the ink at a constant flow rate.

Description

Technical Field

[0001] The present invention belongs to the technical field of pumps, and in particular relates to a liquid variable displacement pump, and more particularly to a flow control method and a flow control system under a state of ink viscosity fluctuation. Background Art

[0002] In the production process of packaging bags, a spraying process is required, and the corresponding ink is used for spraying. During the spraying process, the delivery flow rate needs to be stable.

[0003] In the spraying process, a bellows pump is generally used for infusion. In related technologies, the bellows pump uses two bellows for reciprocating movement and is driven by a pneumatic regulator, so that one bellows absorbs ink under negative pressure while the other bellows squeezes and delivers ink, thereby achieving continuous delivery.

[0004] However, in the above solution, when the viscosity of the ink changes during the conveying process, the conveying flow rate will be unstable.

[0005] Therefore, how to solve the technical problem of unstable delivery flow caused by changes in ink viscosity is urgently needed to be solved by those skilled in the art.

[0006] It should be noted that the above information disclosed in this background technology section is only used to understand the background technology of the present application concept, and therefore, the above description is not considered to constitute information of the prior art. Summary of the Invention

[0007] The embodiments of the present disclosure at least provide a flow control method and a flow control system under a state of ink viscosity fluctuation.

[0008] In the first aspect, an embodiment of the present disclosure provides a flow control method under a state of ink viscosity fluctuation, including: using a bellows pump to continuously deliver ink; regulating the air pressure value of the pneumatic regulator according to the viscosity data of the ink about to enter the bellows, so that the bellows absorbs ink at a constant flow rate; regulating the air pressure value of the pneumatic regulator according to the viscosity data of the ink about to flow out of the bellows, so that the bellows delivers ink at a constant flow rate; wherein the flow rate of absorbing the ink is the same as the flow rate of delivering the ink.

[0009] In an optional embodiment, the method of continuously conveying ink using a bellows pump includes: allowing one pneumatic regulator in the bellows pump to drive the corresponding bellows to absorb ink while allowing another pneumatic regulator in the bellows pump to drive the corresponding bellows to convey ink.

[0010] In an optional embodiment, the method of regulating the air pressure value of the pneumatic regulator according to the viscosity data of the ink about to enter the bellows so that the bellows absorbs ink at a constant flow rate includes: collecting the viscosity data η1 of the ink about to enter the bellows through a first viscosity sensor; and regulating the pneumatic regulator according to the collected ink viscosity data η1 through a control module to drive the bellows pump to absorb ink at a required air pressure value P1.

[0011] In an optional embodiment, the formula for setting the air pressure value P1 required for ink absorption is: Among them, P1 is the air pressure value required by the pneumatic regulator to actually absorb ink, the unit is kPa; P a is the reference air pressure value when the pneumatic regulator absorbs ink, in kPa; k is the adjustment coefficient; η1 is the viscosity data of the ink about to enter the bellows obtained by the first viscosity sensor, in Pa·s; η0 is the standard viscosity data of the ink, in Pa·s.

[0012] In an optional embodiment, the method of regulating the air pressure value of the pneumatic regulator according to the viscosity data of the ink about to flow out of the bellows so that the bellows transports ink at a constant flow rate includes: collecting the viscosity data η2 of the ink about to flow out of the bellows through a second viscosity sensor; and regulating the pneumatic regulator according to the collected ink viscosity data η2 through a control module to drive the bellows pump to transport ink at a required air pressure value P2.

[0013] In an optional embodiment, the formula for setting the air pressure value P2 required for conveying ink is: Among them, P2 is the air pressure value required by the pneumatic regulator to actually transport ink, the unit is kPa; P b is the reference air pressure value when the pneumatic regulator delivers ink, in kPa; k is the adjustment coefficient; η2 is the viscosity data of the ink about to flow out of the bellows obtained by the second viscosity sensor, in Pa·s; η0 is the standard viscosity data of the ink, in Pa·s.

[0014] In the second aspect, the embodiment of the present disclosure also provides a flow control device under the state of ink viscosity fluctuation, including: a bellows pump, used to continuously transport ink, and including: a pump body, in which a pair of bellows and a pair of pneumatic regulators are arranged; a liquid inlet pipe, connected to the feed ports of the two bellows; a liquid outlet pipe, connected to the discharge ports of the two bellows; a pair of first viscosity sensors, used to respectively obtain the viscosity data of the ink in the corresponding feed ports; a pair of second viscosity sensors, used to respectively obtain the viscosity data of the ink in the corresponding discharge ports; a control module, configured to adjust the air pressure value of the corresponding pneumatic regulator according to the ink viscosity data collected by the corresponding viscosity sensor.

[0015] In a third aspect, the embodiments of the present disclosure further provide a flow control system in an ink viscosity fluctuation state, comprising: a collection module configured to collect ink viscosity data about to enter the bellows and collect ink viscosity data about to flow out of the bellows; and an adjustment module configured to adjust the air pressure value of the corresponding pneumatic regulator, so that the bellows can take in ink at a constant flow rate and deliver ink at a constant flow rate.

[0016] In a fourth aspect, the embodiments of the present disclosure further provide a computer-readable storage medium having a computer program / instruction stored thereon, which, when executed by a processor, implements the steps of the flow control method in an ink viscosity fluctuation state as described above.

[0017] In a fifth aspect, the embodiments of the present disclosure further provide a computer program product comprising a computer program / instruction, which, when executed by a processor, implements the steps of the flow control method in an ink viscosity fluctuation state as described above.

[0018] The flow control method and flow control system in an ink viscosity fluctuation state of the present disclosure have the advantages that the real-time collection of ink viscosity data about to enter the bellows and the adjustment of the air pressure value of the pneumatic regulator according to the collected ink viscosity data enable the pneumatic regulator to drive the bellows to take in or deliver ink at a constant flow rate, thereby avoiding large changes in pressure in subsequent spraying processes caused by unstable delivery flow rate.

[0019] Other features and advantages of the present application will be set forth in the descriptions below, and in part will become apparent to those skilled in the art upon examination of the following or can be learned by practice of the present application. The objects and other advantages of the present application can be realized and attained by the structure particularly pointed out in the description below.

[0020] In order to make the above-mentioned objects, features and advantages of the present application more apparent, the preferred embodiments are described in detail below, and the accompanying drawings are described as follows. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or prior art description. Obviously, the drawings described below are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0022] Figure 1 A principle block diagram of a flow control method in an ink viscosity fluctuation state provided by the embodiments of the present disclosure;

[0023] Figure 2A schematic structural diagram of a bellows pump provided in an embodiment of the present disclosure.

[0024] In the picture:

[0025] Bellows pump 1, pump body 10, pneumatic regulator 11, bellows 12, feed port 121, discharge port 122, liquid inlet pipe 13, liquid outlet pipe 14. DETAILED DESCRIPTION

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0027] For example, the bellows pump device with the publication number "CN111306045B" comprises at least a pair of bellows 12 and a pair of pneumatic regulators 11. The pneumatic regulators 11 are used to drive the bellows 12 to work, causing the volume inside the bellows 12 to change, thereby causing the bellows 12 to absorb ink under negative pressure or squeeze and transport the absorbed ink.

[0028] In the related art, the air pressure value of the pneumatic regulator 11 is pre-set according to the standard viscosity data of the ink. During the operation of the bellows pump 1, the air pressure value of the pneumatic regulator 11 will not change, but the viscosity of the ink is difficult to always maintain uniformity. When the viscosity of the ink changes, the flow rate of the bellows 12 absorbing or transporting the ink will fluctuate, thereby affecting the stability of subsequent processes.

[0029] It should be noted that similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings. In addition, in the drawings, the thickness of components may be exaggerated or reduced in order to effectively describe the technical content.

[0030] The following embodiments of the present invention are described in detail with reference to the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments may be combined with each other.

[0031] like Figure 1As shown, at least one embodiment provides a method for controlling the flow of ink in a fluctuating viscosity state, characterized by: continuously conveying ink by using bellows pump 1; adjusting the air pressure value of pneumatic regulator 11 according to the viscosity data of the ink about to enter bellows 12, so that bellows 12 can absorb ink at a constant flow rate; adjusting the air pressure value of pneumatic regulator 11 according to the viscosity data of the ink about to flow out of bellows 12, so that bellows 12 can convey ink at a constant flow rate; wherein the flow rate of absorbing ink is the same as the flow rate of conveying ink.

[0032] In this embodiment, by collecting the viscosity data of the ink about to enter bellows 12 in real time, and adjusting the air pressure value of pneumatic regulator 11 according to the collected viscosity data, pneumatic regulator 11 can drive bellows 12 to absorb or convey ink at a constant flow rate, avoiding large changes in pressure during subsequent spraying processing due to unstable conveying flow.

[0033] As shown, in some embodiments, the method for continuously conveying ink by using bellows pump 1 includes: while one pneumatic regulator 11 in bellows pump 1 drives the corresponding bellows 12 to absorb ink, another pneumatic regulator 11 in bellows pump 1 drives the corresponding bellows 12 to convey ink. Figure 2 In this embodiment, by alternating the conveying of ink by the two bellows 12 in bellows pump 1, i.e., while one bellows 12 is absorbing ink, the other bellows 12 is extruding and conveying ink, bellows pump 1 can continuously convey.

[0034] The two bellows 12 have the same structure, and one of them will be described below as an example.

[0035] In some embodiments, the method for adjusting the air pressure value of pneumatic regulator 11 according to the viscosity data of the ink about to enter bellows 12, so that bellows 12 can absorb ink at a constant flow rate, includes: collecting the viscosity data η1 of the ink about to enter bellows 12 by using a first viscosity sensor; and adjusting the air pressure value P1 of pneumatic regulator 11 according to the collected viscosity data η1 by using a control module, so that bellows pump 1 can absorb ink at the required air pressure value P1.

[0036] In this embodiment, the first viscosity sensor is arranged in the inlet of bellows 12, and sends the viscosity data to the control module after collecting the viscosity data. The control module obtains the required air pressure value P1 of pneumatic regulator 11 according to the received viscosity data η1, so that pneumatic regulator 11 can drive bellows 12 to absorb ink at a constant flow rate.

[0037] In some embodiments, the formula for setting the required air pressure value P1 for absorbing ink is:

[0038] ​Wherein, P1 is the air pressure value required by the pneumatic regulator 11 to actually absorb the ink, in kPa; P a is the reference air pressure value when the pneumatic regulator 11 absorbs ink, in kPa; k is the adjustment coefficient; η1 is the viscosity data of the ink about to enter the bellows 12 obtained by the first viscosity sensor, in Pa·s; η0 is the standard viscosity data of the ink, in Pa·s.

[0039] In this embodiment, the standard viscosity data η0 of the ink is optionally 50 Pa·s; the reference pressure value P when the pneumatic regulator 11 absorbs the ink is a is -70 kPa; k is 0.3; the data η1 collected by the first viscosity sensor is 60 Pa·s.

[0040] That is, the air pressure value P1 required to absorb ink is:

[0041] In some embodiments, the method of regulating the air pressure value of the pneumatic regulator 11 according to the viscosity data of the ink about to flow out of the bellows 12 so that the bellows 12 transports ink at a constant flow rate includes: collecting the viscosity data η2 of the ink about to flow out of the bellows 12 through a second viscosity sensor; and regulating the pneumatic regulator 11 according to the collected ink viscosity data η2 through a control module to drive the bellows pump 1 to transport ink at the required air pressure value P2.

[0042] In this embodiment, the second viscosity sensor is arranged in the discharge port of the bellows 12. When the second viscosity sensor collects the viscosity data, it sends it to the control module. The control module obtains the air pressure value P2 required by the pneumatic regulator 11 under the viscosity data according to the received viscosity data η2, so that the pneumatic regulator 11 can drive the bellows 12 to squeeze and transport the ink at a constant flow rate.

[0043] In some embodiments, the formula for setting the air pressure value P2 required for delivering ink is: Wherein, P2 is the air pressure value required by the pneumatic regulator 11 to actually deliver ink, in kPa; b is the reference air pressure value when the pneumatic regulator 11 delivers ink, in kPa; k is the adjustment coefficient; η2 is the viscosity data of the ink about to flow out of the bellows 12 obtained by the second viscosity sensor, in Pa·s; η0 is the standard viscosity data of the ink, in Pa·s.

[0044] In this embodiment, the standard viscosity data η0 of the ink is optionally 50 Pa·s; the reference pressure value P when the pneumatic regulator 11 absorbs the ink is a is 300 kPa; k is 0.3; the data η2 collected by the second viscosity sensor is 45 Pa·s.

[0045] That is, the air pressure value P2 required to transport ink is:

[0046] like Figure 2 As shown, at least one embodiment also provides a flow control device under the state of ink viscosity fluctuation, including: a bellows pump 1, used for continuously conveying ink, and including: a pump body 10, in which a pair of bellows 12 and a pair of pneumatic regulators 11 are arranged; a liquid inlet pipe 13, connected to the feed port 121 of the two bellows 12; a liquid outlet pipe 14, connected to the discharge port 122 of the two bellows 12; a pair of first viscosity sensors, used to respectively obtain the viscosity data of the ink in the corresponding feed port 121; a pair of second viscosity sensors, used to respectively obtain the viscosity data of the ink in the corresponding discharge port 122; a control module, configured to adjust the air pressure value of the corresponding pneumatic regulator 11 according to the ink viscosity data collected by the corresponding viscosity sensor.

[0047] At least one embodiment also provides a flow control system under a state of ink viscosity fluctuation, including: an acquisition module, configured to collect viscosity data of ink about to enter the bellows 12 and viscosity data of ink about to flow out of the bellows 12; an adjustment module, configured to adjust the air pressure value of the corresponding pneumatic regulator 11, so that the bellows 12 absorbs ink at a constant flow rate and transports ink at a constant flow rate.

[0048] At least one embodiment further provides a computer-readable storage medium having a computer program / instruction stored thereon, wherein the computer program / instruction, when executed by a processor, implements the steps of the flow control method under the ink viscosity fluctuation state as described above.

[0049] At least one embodiment further provides a computer program product, including a computer program / instruction, characterized in that when the computer program / instruction is executed by a processor, the steps of the flow control method under the ink viscosity fluctuation state are implemented as described above.

[0050] To sum up, the flow control method and flow control system under the state of ink viscosity fluctuation collects the ink viscosity data about to enter the bellows 12 in real time, and adjusts the air pressure value of the pneumatic regulator 11 according to the collected ink viscosity data, so that the pneumatic regulator 11 can drive the bellows 12 to absorb or transport ink at a constant flow rate, avoiding large changes in pressure in subsequent spraying processing due to unstable transport flow.

[0051] Herein, when it is mentioned that a first component is located on a second component, this may mean that the first component may be directly formed on the second component or a third component may be interposed between the first component and the second component.

[0052] In this document, when an element or layer is referred to as being "on", "engaged to", "connected to", "attached to" or "coupled to" another element or layer, it can be directly on, engaged, connected, attached or coupled to the other element or layer, or intervening elements or layers can be present. In contrast, when an element is referred to as being "directly on", "directly engaged to", "directly connected to", "directly attached to" or "directly coupled to" another element or layer, there are no intervening elements or layers present. Other words used to describe the relationship between elements should be interpreted in a like fashion (e.g., "between" versus "directly between", "adjacent" versus "directly adjacent", etc.). As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0053] In this document, example embodiments of the disclosure will be described in greater detail with reference to the accompanying drawings. As used herein, expressions such as "at least one of," when preceding a list of two or more items, modify the entire list of items and do not modify the individual items of the list.

[0054] The terminology used herein is for the purpose of describing particular example configurations only and is not intended to be limiting. As used herein, the singular articles "a," "an," and "the" can be intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order

[0055] As used herein, the phrases "in an embodiment," "according to an embodiment," "in some embodiments," and the like, generally mean the particular feature, structure, or characteristic following the phrase can be included in at least one embodiment of the present disclosure. Thus, appearances of such phrases in various places throughout this specification do not necessarily all refer to the same embodiment. As used herein, the term "example" or "exemplary" means "serving as an example, instance, or illustration." Any implementation, aspect or design described herein as "example" or "exemplary" is not necessarily to be construed as preferred or advantageous over other implementations, aspects or designs. Rather, the term "example" or "exemplary" is intended to present concepts in a concrete manner.

[0056] In the description of the embodiments of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0057] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, terms such as "first", "second" and other numerical terms do not imply an order or sequence when used herein unless expressly indicated above. Therefore, without departing from the teachings of the example embodiments, the first element, component, region, layer or section discussed above may be referred to as a second element, component, region, layer or section.

[0058] Spatially relative terms, such as "inside," "outside," "below," "beneath," "down," "above," "on," etc., may be used herein to describe the relationship of one element or feature to another element or feature as illustrated in the figures. In addition to the orientations depicted in the figures, spatially relative terms may be intended to encompass different orientations of the device in use or operation. For example, if the device in the figures is flipped, an element described as being "below" or "below" other elements or features will be oriented to be "above" the other elements or features. Thus, the example term "below" may encompass both above and below orientations. The device may be oriented otherwise (rotated 90 degrees or in other orientations), and the spatially relative descriptors used herein are interpreted accordingly.

[0059] In the above discussion, unless otherwise indicated, the terms "about," "approximately," "substantially," etc., when used to describe a numerical value, mean a variation of + / - 10% of the value.

[0060] With the above-described preferred embodiments of the present invention as a guide, and with reference to the above description, relevant personnel are fully capable of making various changes and modifications without departing from the technical scope of this invention. The technical scope of this invention is not limited to the contents of the specification and must be determined according to the scope of the claims.

Claims

1. A flow control method under ink viscosity fluctuation state, characterized in that: include: A bellows pump (1) is used to continuously deliver ink; According to the viscosity data of the ink about to enter the bellows (12), the air pressure value of the pneumatic regulator (11) is regulated so that the bellows (12) absorbs the ink at a constant flow rate; According to the viscosity data of the ink about to flow out of the bellows (12), the air pressure value of the pneumatic regulator (11) is regulated so that the bellows (12) can transport the ink at a constant flow rate; The flow rate of ink absorption is the same as the flow rate of ink delivery; The method for continuously conveying ink using a bellows pump (1) comprises: One pneumatic regulator (11) in the bellows pump (1) drives the corresponding bellows (12) to absorb ink, while another pneumatic regulator (11) in the bellows pump (1) drives the corresponding bellows (12) to transport ink; The method of regulating the air pressure value of the pneumatic regulator (11) according to the viscosity data of the ink about to enter the bellows (12) so as to make the bellows (12) absorb the ink at a constant flow rate comprises: The viscosity data of the ink about to enter the bellows (12) is collected by the first viscosity sensor η 1 ; Through the control module according to the collected ink viscosity data η 1 Adjust the pneumatic regulator (11) to the required air pressure value P 1 driving the bellows pump (1) to suck ink; The method of regulating the air pressure value of the pneumatic regulator (11) according to the viscosity data of the ink about to flow out of the bellows (12) so as to enable the bellows (12) to transport the ink at a constant flow rate comprises: The viscosity data of the ink about to flow out of the bellows (12) is collected by the second viscosity sensor η 2 ; Through the control module according to the collected ink viscosity data η 2 Adjust the pneumatic regulator (11) to the required air pressure value P 2 The bellows pump (1) is driven to deliver ink.

2. The flow control method under the condition of ink viscosity fluctuation according to claim 1, characterized in that: Set the air pressure required to absorb ink P 1 The formula is: ; in, P 1 The air pressure value required by the pneumatic regulator (11) to actually absorb the ink, in kPa; P a The reference air pressure value when the pneumatic regulator (11) absorbs ink, the unit is kPa; k is the adjustment coefficient; η 1 The viscosity data of the ink about to enter the bellows (12) obtained by the first viscosity sensor, in Pa·s; η 0 It is the standard viscosity data of ink, and the unit is Pa·s.

3. The flow control method under the condition of ink viscosity fluctuation according to claim 2, characterized in that: Set the air pressure required to transport ink P 2 The formula is: ; in, P 2 The air pressure value required by the pneumatic regulator (11) to actually deliver ink, in kPa; P b The reference air pressure value when the pneumatic regulator (11) delivers ink, the unit is kPa; k is the adjustment coefficient; η 2 The viscosity data of the ink about to flow out of the bellows (12) obtained by the second viscosity sensor, in Pa·s; η 0 It is the standard viscosity data of ink, and the unit is Pa·s.

4. A flow control device for ink under a state of fluctuating viscosity using the flow control method for ink under a state of fluctuating viscosity according to any one of claims 1 to 3, characterized in that: include: A bellows pump (1) is used for continuously conveying ink and comprises: a pump body (10), wherein a pair of bellows (12) and a pair of pneumatic regulators (11) are provided in the pump body (10); A liquid inlet pipe (13) connected to the feed ports (121) of the two bellows (12); A liquid outlet pipe (14) connected to the outlets (122) of the two bellows (12); A pair of first viscosity sensors, used to respectively obtain viscosity data of ink in corresponding feed ports (121); A pair of second viscosity sensors, used to respectively obtain viscosity data of ink in corresponding discharge ports (122); The control module is configured to adjust the air pressure value of the corresponding pneumatic regulator (11) according to the ink viscosity data collected by the corresponding viscosity sensor.

5. A flow control system under ink viscosity fluctuation conditions using the flow control method under ink viscosity fluctuation conditions according to any one of claims 1 to 3, characterized in that: include: A collection module configured to collect viscosity data of ink about to enter the bellows (12) and to collect viscosity data of ink about to flow out of the bellows (12); The regulating module is configured to regulate the air pressure value of the corresponding pneumatic regulator (11) so that the bellows (12) absorbs ink at a constant flow rate and delivers ink at a constant flow rate.

6. A computer-readable storage medium having a computer program / instruction stored thereon, characterized in that: When the computer program / instruction is executed by a processor, the steps of the flow control method under the ink viscosity fluctuation state described in any one of claims 1 to 3 are implemented.

7. A computer program product comprising a computer program / instructions, characterized in that When the computer program / instruction is executed by a processor, the steps of the flow control method under the ink viscosity fluctuation state described in any one of claims 1 to 3 are implemented.

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