A method for vacuum plugging of container

Abstract

The invention discloses a container vacuum plugging method, which includes the following steps: evacuating the container and then plugging the container, wherein the vacuuming comprises the following steps: a) increasing the pressure in the container from normal pressure to a first negative pressure value so that bubbles are separated from the inner wall of the container; b) reducing the pressure in the container from the first negative pressure value to a second negative pressure value so that the bubbles rise to the liquid surface; and c) increasing the pressure in the container from the second negative pressure value to the first negative pressure value to complete the vacuuming; wherein the absolute value of the first negative pressure value is greater than the absolute value of the second negative pressure value; the invention ensures that the bubbles in the container enter the liquid after being separated from the inner wall; the bubbles continue to move from the liquid to the liquid surface, and burst after rising to the liquid surface, thereby reducing the presence of bubbles in the container; and finally, the pressure in the container is increased to the first negative pressure value, the air on the liquid surface is vacuumed, and then the vacuum plugging is performed at the first negative pressure value.

Description

Technical Field

[0001] The invention relates to the field of container stoppering, in particular to a container vacuum stoppering method. Background Art

[0002] After the container is filled with liquid, it needs to be stoppered and sealed. Stoppering is divided into ordinary stoppering and vacuum stoppering. Among them, vacuum stoppering is to first evacuate the container and then stopper it. The main feature of vacuum stoppering is that there will be no air in the closed container. It is generally used on pre-filled needles and cartridge bottles. For example, "A High-Speed ​​Vacuum Stoppering System and Method" with publication number CN117682465A also discloses that vacuum stoppering is a prior art.

[0003] The existing vacuuming method uses the greatest possible pressure to draw a vacuum into the container (the greater the opening of the proportional valve, the greater the vacuuming pressure). However, there are residual bubbles in the liquid during filling. During the existing vacuuming method, excessive pressure will cause the liquid level to rise along the bottle wall (negative pressure may cause the liquid to boil), and the liquid may leak out of the container. When the liquid level is high, the bubbles will be exposed to the liquid surface and burst, which will also cause the liquid to splash to the bottle mouth or even outside the bottle. Finally, there will be liquid inclusion when the stopper is added, which does not meet the requirements and reduces the qualified rate. Summary of the Invention

[0004] The purpose of the invention is to provide a container vacuum plugging method to solve the problem of how to efficiently extract bubbles in the container and how to control the bubbles to be exposed and burst when the liquid level is low.

[0005] The present invention is achieved by providing a container vacuum plugging method, wherein the container is vacuumed and then plugged, wherein the vacuuming comprises the steps of: a) increasing the pressure in the container from normal pressure to a first negative pressure value to separate bubbles from the inner wall of the container;

[0006] Step b: the pressure in the container is reduced from the first negative pressure value to the second negative pressure value so that the bubbles rise to the liquid surface;

[0007] Step c: the pressure value in the container is increased from the second negative pressure value to the first negative pressure value, completing the vacuuming; after the vacuuming, the bottle stopper is pressed into the container to complete the stoppering.

[0008] The absolute value of the first negative pressure value is greater than the absolute value of the second negative pressure value.

[0009] In the present invention, the pressure in the container is first adjusted to a first negative pressure value to ensure that the bubbles in the container detach from the inner wall and enter the liquid; then, in order to prevent the liquid level from rising to the bottle mouth after the bubbles detach, the negative pressure in the container is reduced from the first negative pressure value to a second negative pressure value, and the absolute value of the first negative pressure value is greater than the second negative pressure value; under the second negative pressure value, the bubbles continue to move from the liquid to the liquid surface, and the bubbles burst after rising to the liquid surface, thereby reducing the presence of bubbles in the container; finally, the pressure in the container is increased to the first negative pressure value, the air on the liquid surface is evacuated, and then vacuum plugging is performed at the first negative pressure value.

[0010] A further technical solution of the present invention is: in step a, the pressure value in the container is increased from normal pressure to a first negative pressure value at a first rate and a second rate in sequence within a period of time, the first rate is less than the second rate, and the slow pressure increase is used to make the pressure of the medicine liquid in the bottle uniform, ensuring that the negative pressure can be transmitted to the bottom of the bottle, and the rate is slow at first and then fast to shorten the pressure increase time.

[0011] A further technical solution of the present invention is: in step a, the pressure value in the container is increased to a first negative pressure value and then maintained for a period of time, so as to evenly transmit the negative pressure to the bottom of the bottle and ensure that the bubbles are drawn out.

[0012] A further technical solution of the present invention is: in the step b, after the pressure value in the container is reduced to the second negative pressure value, the pressure value is increased to the first negative pressure value within a period of time to cause the bubbles to rise, so that the liquid level in the container is first lowered and then slowly increased, and the bubbles in the container gradually rise to the liquid surface. Maintaining the second negative pressure value can also cause the bubbles to rise, but the rising speed of the bubbles is slow, which affects the efficiency. The present invention can ensure that the liquid level is below the bottle mouth and the bubbles are extracted as soon as possible.

[0013] A further technical solution of the present invention is: after the pressure value in the container is reduced to a second negative pressure value and maintained for a period of time, the pressure value is increased to the first negative pressure value to ensure that the liquid level in the container is lowered, preparing for the subsequent liquid level increase.

[0014] A further technical solution of the present invention is that the pressure value in the container is increased to a first negative pressure value and then decreased to a second negative pressure value to lower the liquid level, and the liquid level is lowered by debugging when bubbles are about to leak out of the liquid surface.

[0015] A further technical solution of the present invention is: the pressure value in the container is increased to a first negative pressure value and then reduced to a second negative pressure value and maintained for a period of time, so that the liquid level has time to drop to an appropriate height to ensure that bubbles are exposed to the liquid surface.

[0016] A further technical solution of the present invention is: in the step c, the pressure value in the container is increased from the second negative pressure value to the first negative pressure value and maintained for a period of time, so as to extract the air on the surface of the medicine liquid and complete the vacuuming.

[0017] A further technical solution of the present invention is: the first negative pressure value is -0.9 bar to -1 bar, and the second negative pressure value is -0.7 bar to -0.8 bar.

[0018] The beneficial effects of the present invention are as follows: in the present invention, the pressure in the container is first adjusted to a first negative pressure value to ensure that the bubbles in the container detach from the inner wall and enter the liquid; then, in order to prevent the liquid level from rising to the bottle mouth after the bubbles detach, the negative pressure value in the container is reduced from the first negative pressure value to a second negative pressure value, and the absolute value of the first negative pressure value is greater than the second negative pressure value; under the second negative pressure value, the bubbles continue to move from the liquid to the liquid surface, and the bubbles burst after rising to the liquid surface, thereby reducing the presence of bubbles in the container; finally, the pressure in the container is increased to the first negative pressure value, and vacuum plugging is performed under the first negative pressure value. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a vacuum pressure curve diagram of a container vacuum stoppering method provided by the present invention;

[0020] Figure 2 This is a diagram of the internal changes of a container during the vacuuming process of a container vacuum stoppering method provided by the present invention. DETAILED DESCRIPTION

[0021] The following describes the embodiments of the present invention through specific examples. Those skilled in the art will readily understand the other advantages and benefits of the present invention from the disclosure herein. The present invention may also be implemented or applied through various other specific embodiments, and the details in this specification may be modified or altered based on different viewpoints and applications without departing from the spirit of the present invention.

[0022] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for understanding and reading by those familiar with this technology, and are not used to limit the conditions for implementation of the present invention. Therefore, they have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the efficacy and purpose that can be achieved by the present invention. At the same time, terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description and are not used to limit the scope of implementation of the present invention. Changes or adjustments in their relative relationships should also be regarded as the scope of implementation of the present invention without substantially changing the technical content.

[0023] Example 1:

[0024] Figure 1-2A container vacuum plugging method is shown, wherein the container is vacuumed and then plugged, wherein the vacuuming comprises the steps of: a) increasing the pressure in the container from normal pressure to a first negative pressure value to separate bubbles from the inner wall of the container;

[0025] Step b: the pressure in the container is reduced from the first negative pressure value to the second negative pressure value so that the bubbles rise to the liquid surface;

[0026] Step c: the pressure value in the container is increased from the second negative pressure value to the first negative pressure value, completing the vacuuming;

[0027] After vacuuming, the bottle stopper is pressed into the container to complete the stoppering.

[0028] The absolute value of the first negative pressure value is greater than the absolute value of the second negative pressure value.

[0029] The stopper sleeve is attached to the bottle mouth of the container for sealing. The vacuum device vacuumizes the container through the stopper sleeve. The vacuum device includes a vacuum pump and a proportional valve arranged on the pipeline. The vacuum pressure can be adjusted by controlling the opening of the proportional valve. The larger the opening of the proportional valve, the greater the absolute value of the vacuum pressure. Figure 1 In the figure, the vertical axis is the air pressure value, and the air pressure value is adjusted according to the opening of the proportional valve. Figure 1 The vertical coordinate is replaced by the opening of the proportional valve. The opening value ranges from 0 to -1, and the proportional valve opening corresponding to -1 is fully open.

[0030] In this embodiment, in step a, the pressure value in the container is increased from normal pressure to a first negative pressure value at a first rate and a second rate in sequence within a period of time, and the first rate is less than the second rate (corresponding to Figure 1 The first rate and the second rate are the slopes of the AB line and the BC line respectively. In other embodiments, there may be more than two rates. For example, over a period of time, the slope gradually increases so that Figure 1 The ABC segments become multiple broken lines or even curves.

[0031] In this embodiment, in step a, the pressure value in the container is increased to the first negative pressure value and then maintained for a period of time ( Figure 1 (CD segment in the ).

[0032] In this embodiment, in step b, the pressure in the container is reduced to the second negative pressure value and maintained for a period of time (corresponding to Figure 1 EF segment in the middle), the pressure value increases to the first negative pressure value within a period of time to make the bubbles rise (corresponding to Figure 1 The pressure in the container is increased to the first negative pressure value and then decreased to the second negative pressure value, causing the liquid level to drop and remain there for a period of time ( Figure 1The pressure increasing rate in the figure is the slope of the straight line FG. In other embodiments, the pressure increasing rate may be variable, that is, FG is a broken line or a curve.

[0033] In this embodiment, in step c, the pressure value in the container is increased from the second negative pressure value to the first negative pressure value and maintained for a period of time.

[0034] In this embodiment, the pressure value changes from S1 to S2 within a certain period of time (t), and the proportional valve opening (M) is controlled by the current time (at), so that the vacuum pressure (S1) increases uniformly over time to the set value (S2); the proportional valve opening control formula is: M = at / t*(s2-s1)+s1; Figure 1 The proportional valve opening control of the middle AB section, BC section, and FG section is shown above. For example, from 0 to 2 seconds, the air pressure value ranges from 0 to -1. At 1 second, the proportional valve opening is M = 1 / 2*(-1-0)+0 = -0.5, so the proportional valve is half open at this time.

[0035] In this embodiment, the first negative pressure value is -0.9 bar to -1 bar, and the second negative pressure value is -0.7 bar to -0.8 bar. When the air pressure reaches -1 bar, it is considered to be an absolute vacuum. Currently, it is impossible to completely eliminate the air in the bottle. The second negative pressure value is obtained based on debugging experience. In theory, as long as it is a negative pressure, it can expel bubbles and lower the liquid level.

[0036] In this embodiment, Figure 2 The state diagrams from left to right correspond to Figure 1 The states of segment ABC, point D, point F, point G, point I, point K and point L in the diagram.

[0037] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for vacuum plugging a container, wherein the container is vacuumed and then plugged, characterized in that: The vacuuming comprises the steps of: increasing the pressure in the container from normal pressure to a first negative pressure value so that bubbles are separated from the inner wall of the container; Step b: the pressure in the container is reduced from the first negative pressure value to the second negative pressure value so that the bubbles rise to the liquid surface; Step c: the pressure value in the container is increased from the second negative pressure value to the first negative pressure value, completing the vacuuming; The absolute value of the first negative pressure value is greater than the absolute value of the second negative pressure value. In step b, the pressure value in the container is reduced to the second negative pressure value and maintained for a period of time, and then the pressure value is increased to the first negative pressure value within a period of time to cause bubbles to rise. The pressure value in the container is increased to the first negative pressure value and then reduced to the second negative pressure value to cause the liquid level to drop and be maintained for a period of time.

2. A container vacuum stoppering method according to claim 1, characterized in that: In step a, the pressure value in the container is increased from normal pressure to a first negative pressure value at a first rate and a second rate in sequence over a period of time, and the first rate is smaller than the second rate.

3. A container vacuum stoppering method according to claim 1, characterized in that: In the step a, the pressure in the container is increased to a first negative pressure value and maintained for a period of time.

4. A container vacuum stoppering method according to claim 1, characterized in that: In the step c, the pressure in the container is increased from the second negative pressure value to the first negative pressure value and maintained for a period of time.

5. A container vacuum stoppering method according to claim 1, characterized in that: The first negative pressure value is -0.9 bar to -1 bar, and the second negative pressure value is -0.7 bar to -0.8 bar.

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