A sealing test device for packaging bags

Abstract

The present invention relates to the field of sealing detection technology, and specifically, to a sealing detection device for packaging bags. It includes a device base, a detection chamber and a waste chamber are provided at the top of the device base, a detection component is arranged inside the detection chamber, and a fastening component is arranged inside the waste chamber. The fastening component can not only crush and recycle unqualified packaging bags, but also blow and clean the inside of the packaging bag during the packaging bag detection process. The present invention places the packaging bag to be tested between the conveyor belt groups, so that during the transportation of the packaging bag, based on the principle of fluid dynamics, the state of the packaging bag under the action of wind in the natural environment is simulated, and whether the bag has leakage, bulging and other phenomena, so as to judge the sealing of the packaging bag, and the position of the packaging bag to be tested is limited by the buckle group to ensure the stability of the packaging bag during transportation, thereby improving the accuracy of the sealing detection result of the packaging bag.

Description

Technical Field

[0001] The present invention relates to the technical field of sealing detection, in particular to a sealing detection device for packaging bags. Background Art

[0002] With the rapid development of the modern packaging industry, plastic flexible packaging bags and other packaging materials are widely used in food, medicine, chemical industry, daily necessities and other industries due to their lightness, durability and plasticity. However, the sealing performance of packaging bags is directly related to the shelf life, safety and user experience of the product. Therefore, the sealing performance test of packaging bags is particularly important.

[0003] The current testing method usually involves stretching the sealed portion of the packaging bag, connecting it to the testing instrument, and injecting a fluid (such as air) into the packaging bag at a certain pressure, and testing the sealing of the packaging bag by observing the gas leakage. Due to the different specifications of packaging bags, their sizes and bag thicknesses are different, so different packaging bags are adapted to different airflow pressures. When the thickness of the packaging bag is too thin, the packaging bag may be broken due to the pressure of the gas when simulating the pressure environment of the packaging bag in actual use by delivering gas, and its sealing performance cannot be accurately evaluated;

[0004] In the production process of packaging bags, it is a common problem that impurities and dust are easily retained inside. In the process of testing the seal of the conveying fluid, it is easy to mix the original impurities in the packaging bag, which makes it inconvenient to use the subsequent packaging bags. In view of this, we propose a sealing detection device for packaging bags. Summary of the invention

[0005] The object of the present invention is to provide a sealing detection device for packaging bags to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides a sealing detection device for packaging bags, comprising a device base, a universal wheel is installed at the bottom of the device base, a detection cavity is opened on one side of the top of the device base, and a waste cavity for collecting packaging bags with unqualified sealing is opened on the side of the top of the device base away from the detection cavity;

[0007] The detection chamber is provided with a detection component inside, and the detection component can detect the sealing property through the shape change of the packaging bag during the process of driving the packaging bag to be conveyed against the wind, and the detection component includes a buckle group, and the buckle group limits the conveying detection position of the packaging bag to be detected;

[0008] A fastening assembly is provided inside the waste chamber, and the fastening assembly includes a power fan rotatably arranged inside the waste chamber. Two power fans are provided, and the power fans can crush and recycle unqualified packaging bags. Meanwhile, the rotation of the power fans can also blow and clean the inside of the packaging bags during the packaging bag detection process. When the fastening assembly blows the packaging bags conveyed to the end, it can assist the detection assembly in adsorbing and collecting qualified packaging bags.

[0009] As a further improvement of the present technical solution, the detection component includes a conveyor belt group installed inside the detection cavity, the interior of the conveyor belt group forms a detection chamber, and a plurality of buckle groups are installed on the surface of the conveyor belt group. The plurality of buckle groups cooperate with each other to form a clamping chamber, and the clamping chamber is used to clamp and limit the packaging bag to be tested.

[0010] As a further improvement of the present technical solution, the conveyor belt group includes an upper belt and a lower belt, the upper belt is movably connected to the inner wall of the detection chamber, the upper outer wall of the equipment base is fixedly connected to two support plates, the lower belt is rotatably arranged between the two support plates, and the surface of the upper belt is covered with an electrostatic adsorption film.

[0011] As a further improvement of the present technical solution, the buckle group includes a first buckle group and a second buckle group, the first buckle group is composed of a sleeve plate and a first soft fixed plate, the sleeve plate is sleeved on the side surface of the first soft fixed plate away from the conveyor belt group, and the second buckle group is composed of an extension plate and a second soft fixed plate, the extension plate is sleeved on the side surface of the second soft fixed plate away from the conveyor belt group.

[0012] As a further improvement of the technical solution, the fastening assembly includes a linkage group connected to the end of the lower belt, the linkage group is located on the outer wall of the equipment base, the linkage group is composed of an active member, a driven member and a transmission belt, the transmission belt is located between the active member and the driven member, the active member is connected to a rotating shaft on one side of the lower belt away from the support plate, and the driven member is fixedly connected to one end of the conical gear group;

[0013] The two power fans are meshedly connected with the surface of the conical gear set, and the two power fans are connected with the inner wall of the waste chamber through a support member, and the two power fans are in a slightly inclined state.

[0014] As a further improvement of the technical solution, a dust storage bin is provided on one side of the plurality of extension plates away from the second soft fixed plate.

[0015] As a further improvement of the technical solution, the plurality of buckle groups are placed in an interlaced manner to drive the packaging bags to be tested to perform interlaced detection.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. In the sealing test equipment for packaging bags, by placing the packaging bags to be tested between the conveyor belt groups, the state of the packaging bags under the action of wind in the natural environment is simulated based on the principle of fluid dynamics during the transportation of the packaging bags, and whether the bags are leaking, bulging, etc. is observed, so as to judge the sealing of the packaging bags. The position of the packaging bags to be tested is limited by the buckle group to ensure the stability of the packaging bags during transportation, thereby improving the accuracy of the sealing test results of the packaging bags;

[0018] 2. In the sealing detection device for packaging bags, a fastening component is used which is arranged in the waste material chamber, and the fastening component can be started simultaneously with the detection component. When the packaging bags are transported against the wind, the fastening component can provide wind flow for them, thereby improving the sealing detection efficiency of the packaging bags. When the power fan rotates, the inside of the packaging bags can also be blown, thereby blowing away impurities inside the packaging bags;

[0019] 3. In the sealing detection equipment for packaging bags, when the sealing inside the packaging bag is strong, the packaging bag will expand and deform, so that the top of the packaging bag can fit with the surface of the conveyor belt group, and then the surface of the plastic packaging bag and the surface of the upper belt are electrostatically adsorbed, so as to achieve the effect of collecting packaging bags with qualified sealing performance;

[0020] 4. In the sealing detection equipment for packaging bags, when the packaging bags are conveyed to the end of the conveyor belt group, the adsorption effect between the packaging bags and the upper belt can be improved by the inclined power fan. At the same time, the packaging bags with unqualified sealing can also be crushed by the power fan and then enter the waste chamber for recycling. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 It is a schematic diagram of the packaging bag conveying direction structure of the present invention;

[0023] Figure 3 This is a schematic diagram of the feeding structure of the packaging bag of the present invention;

[0024] Figure 4 It is a schematic diagram of the airflow support bag structure of the present invention;

[0025] Figure 5 It is a schematic diagram of the structure of the fastening assembly of the present invention;

[0026] Figure 6 It is a schematic diagram of the structure of the second buckle group of the present invention;

[0027] Figure 7 It is a schematic diagram of the packaging bag placement structure of the present invention.

[0028] The meaning of each number in the figure is:

[0029] 1. Equipment base; 11. Detection chamber; 12. Waste chamber;

[0030] 2. Detection assembly; 21. Conveyor belt assembly; 22. Buckle assembly; 23. Support plate; 24. Detection chamber; 25. Clamping chamber; 211. Upper belt; 212. Lower belt; 221. First buckle assembly; 222. Second buckle assembly; 2201. Cover plate; 2202. First soft fixing plate; 2211. Extension plate; 2212. Second soft fixing plate;

[0031] 3. Fastening assembly; 31. Power fan; 32. Conical gear set; 33. Linkage set; 331. Active member; 332. Driven member; 333. Transmission belt;

[0032] 4. Electrostatic adsorption film;

[0033] 5. Dust storage bin. DETAILED DESCRIPTION

[0034] The following will be combined with the accompanying drawings in the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Example

[0035] See also Figure 1 As shown, the purpose of this embodiment is to provide a sealing detection device for packaging bags, including a device base 1, a universal wheel is installed at the bottom of the device base 1, a detection cavity 11 is opened on one side of the top of the device base 1, and a waste cavity 12 for collecting packaging bags with unqualified sealing is opened on the side of the top of the device base 1 away from the detection cavity 11, and a detection component 2 is arranged inside the detection cavity 11. During the process of the detection component 2 driving the packaging bag to transport against the wind, the sealing can be detected by the shape change of the packaging bag. The detection component 2 includes a buckle assembly 22, the buckle group 22 limits the conveying detection position of the packaging bag to be tested, and a fastening component 3 is arranged inside the waste chamber 12. The fastening component 3 includes a power fan 31 rotatably arranged inside the waste chamber 12. There are two power fans 31. The power fans 31 can crush and recycle unqualified packaging bags. At the same time, the rotation of the power fan 31 can also blow and clean the inside of the packaging bag during the packaging bag detection process. When the fastening component 3 blows the packaging bag conveyed to the end, it can assist the detection component 2 to adsorb and collect the qualified packaging bags.

[0036] First, the specific structure of the detection assembly 2 is disclosed. The detection assembly 2 includes a conveyor belt assembly 21 installed inside the detection chamber 11. The interior of the conveyor belt assembly 21 forms a detection chamber 24. A plurality of buckle assemblies 22 are installed on the surface of the conveyor belt assembly 21. The plurality of buckle assemblies 22 cooperate with each other to form a clamping chamber 25. The clamping chamber 25 is used to clamp and limit the packaging bag to be tested. Figure 2 and Figure 3 When the packaging bag to be tested needs to be tested, the packaging bag to be tested needs to be opened, and the opening of the packaging bag needs to be consistent with the conveying direction of the conveyor belt group 21. As the conveyor belt group 21 is conveying, the packaging bag can be placed inside the inspection chamber 24, and the packaging bag is also located in the clamping chamber 25. Figure 4 As shown, with the rapid transmission of the conveyor belt group 21, based on the principle of fluid dynamics, when the packaging bag slides against the wind, the force exerted by the wind on the bag is used to make the bag body bulge. If there are holes inside the packaging bag, air can leak out from the holes in the bag body when the bag slides against the wind, and the shape of the bag body remains unchanged. The changes in the shape of the packaging bag are observed to realize the sealing test of the packaging bag.

[0037] During the packaging bag conveying process, the packaging bags need to be conveyed by the conveyor belt group 21. In view of this, on the basis of the above structure, the conveyor belt group 21 is further disclosed, and the conveyor belt group 21 includes an upper belt 211 and a lower belt 212. The upper belt 211 is movably connected to the inner wall of the detection chamber 11, and the upper outer wall of the equipment base 1 is fixedly connected to two support plates 23. The lower belt 212 is rotatably arranged between the two support plates 23, and the surface of the upper belt 211 is covered with an electrostatic adsorption film 4. It can be seen that the packaging bag can be located between the upper belt 211 and the lower belt 212 during transportation, wherein the upper belt 211 and the lower belt 212 are both synchronous belt structures, and the synchronous belt exerts a certain tension on the driving pulley and the driven pulley to generate positive pressure between the contact surface of the belt and the pulley, and the driving pulley is driven to rotate by the motor, and the driven pulley is driven to rotate by the friction between the belt and the pulley, thereby realizing the transmission of motion and power, and the upper and lower sets of synchronous belts operate simultaneously in the same direction, which can drive the packaging bag to be transported to detect the sealing performance against the wind, wherein the length of the upper belt 211 is shorter than that of the lower belt 212;

[0038] Since the bags to be tested are different, their overall dimensions will also change accordingly. Before conducting a sealing test on the same batch of packaging bags, the position of the upper belt 211 is adjusted by moving the support plate 23, thereby adjusting the internal dimensions of the testing chamber 24 to adapt to the testing of packaging bags of different types. The upper belt 211 is adjusted by disassembling the starter from the support plate at the other end (which can be installed with bolts), adjusting it to a suitable position, and then installing the upper belt 211.

[0039] During the conveying and inspection process, the two sides of the packaging bag need to be clamped and limited by the buckle group 22. Therefore, based on the above structure, the specific structure of the buckle group 22 is further disclosed. The buckle group 22 includes a first buckle group 221 and a second buckle group 222. The first buckle group 221 is composed of a sleeve plate 2201 and a first soft fixed plate 2202. The sleeve plate 2201 is sleeved on the side surface of the first soft fixed plate 2202 away from the conveyor belt group 21. The second buckle group 222 is composed of an extension plate 2211 and a second soft fixed plate 2212. The extension plate 2211 is sleeved on the side surface of the second soft fixed plate 2212 away from the conveyor belt group 21. Figure 7 It can be seen that the sleeve plate 2201 and the extension plate 2211 are respectively sleeved on the surfaces of the first soft fixing plate 2202 and the second soft fixing plate 2212, so that the first buckle group 221 and the second buckle group 222 limit the top and bottom of the packaging bag, thereby achieving an auxiliary fixing effect on the packaging bag and improving the detection accuracy of the packaging bag. If the bag body of the packaging bag to be tested is of different thickness, combined with Figure 6 As shown, the sleeve plate 2201 and the extension plate 2211 are disassembled to adjust the sleeve position, and then fixed by bolts to achieve the purpose of adjusting the height of the first buckle group 221 and the second buckle group 222, which is more convenient for clamping and limiting packaging bags with different bag thicknesses.

[0040] Then, the specific structure of the fastening assembly 3 is disclosed. The fastening assembly 3 includes a linkage group 33 connected to the end of the lower end belt 212. The linkage group 33 is located on the outer wall of the device base 1. The linkage group 33 is composed of an active member 331, a driven member 332 and a transmission belt 333. The transmission belt 333 is located between the active member 331 and the driven member 332. The active member 331 is connected to a rotating shaft on one side of the lower end belt 212 away from the support plate 23. The driven member 332 is fixedly connected to one end of the conical gear group 32.

[0041] The two power fans 31 are meshed and connected to the surface of the conical gear set 32. The two power fans 31 are connected to the inner wall of the waste chamber 12 through a support member. The two power fans 31 are in a slightly inclined state. Figure 5 As shown, when the conveyor belt group 21 is started, the active member 331 is driven to run synchronously. Through the transmission belt 333 provided between the active member 331 and the driven member 332, while the active member 331 is running, the driven member 332 rotates accordingly, driving the conical gear group 32 coaxially connected to the driven member 332 to rotate, thereby rotating the two power fans 31 meshing with the conical gear group 32. Through the rotation of the power fan 31, the wind speed can be provided during the windward detection of the packaging bag, which effectively improves the detection accuracy of the sealing of the packaging bag;

[0042] The specific structure of the conical tooth group 32 is disclosed below. The conical tooth group 32 is composed of a plurality of conical teeth and a rotating shaft. Adjacent conical teeth are meshingly connected, and the outer conical teeth are coaxially connected to the rotating shaft of the power fan 31, so that when the rotating shaft of the conical tooth group 32 rotates, it can drive the power fan 31 to rotate.

[0043] While the two power fans 31 are blowing the packaging bags, impurities inside the packaging bags can also be blown away, so that the packaging bags with good sealing properties can be used later;

[0044] When the packaging bag is conveyed to the end of the upper belt 211, if the internal sealing of the packaging bag is intact, the bag body can be expanded and deformed. With the assistance of the fanning of the power fan 31, the upper surface of the packaging bag can be attached to the electrostatic adsorption film 4. With the rotation of the upper belt 211 and the lower end of the buckle group 22 being a soft material, the packaging bag can be separated from the lower belt 212. When the qualified packaging bags rotate with the upper belt 211 to the upper end of the conveyor belt group 21, the packaging bags with qualified sealing can be manually collected. If there are holes and gaps inside the packaging bag, when the packaging bag is subjected to wind flow detection, the bag body cannot be expanded, and the surface of the packaging bag with unqualified sealing cannot be attached to the electrostatic adsorption film 4 on the surface of the upper belt 211, resulting in the packaging bag with unqualified sealing falling between the two power fans 31, assisted by the rotation of the power fan 31 for crushing, and then falling into the waste chamber 12 for recycling.

[0045] There is a gap between the two power fans 31 , and the two rows of buckle groups 22 are respectively aligned with the two power fans 31 , thereby reducing the possibility that a packaging bag with unqualified sealing performance is stuck between the two power fans 31 .

[0046] It needs to be disclosed that: when the electrostatic adsorption film 4 contacts the surface of the plastic bag, the friction between the two generates static charge. Since the electrostatic adsorption film 4 has conductive properties, the static charge can be conducted to the ground or other conductors, thereby achieving electrostatic adsorption with the plastic bag.

[0047] During the process of conveying the packaging bag against the wind for inspection, the impurities and dust inside the packaging bag will be blown out by the power fan 31. Therefore, in order to reduce the possibility of the blown impurities falling back into the packaging bag or affecting other packaging bags in the inspection bin 24, a dust storage bin 5 is provided on the side of the extension plates 2211 away from the second soft fixing plate 2212. Figure 4As shown, under the blowing of the power fan 31, the dust will fall into the dust storage bin 5 at the opening of the packaging bag along the inner wall of the packaging bag, and because the inner wall of the dust storage bin 5 is in an arc-shaped state, the dust is not easy to re-enter the packaging bag. When the buckle group 22 rotates with the conveyor belt group 21, the dust in the dust storage bin 5 can be discharged. (The dust in the dust storage bin 5 can also be manually cleaned and discharged)

[0048] Since it takes a certain amount of time for the wind to exert force on the packaging bags, in order to maximize the air intake of the packaging bags inside the detection chamber 24, the multiple sets of buckle groups 22 are staggered to drive the packaging bags to be tested to perform staggered testing.

[0049] The improvement lies in that: by staggeredly placing multiple groups of buckle groups 22, there is a certain interval between the packaging bags tested in the same row, which makes it easier for wind to enter the interior of the packaging bags, thereby improving the sealing test effect.

[0050] In summary, the working principle of this scheme is as follows: when the packaging bag to be tested needs to be tested, the packaging bag to be tested needs to be opened, and the opening of the packaging bag needs to be consistent with the conveying direction of the conveyor belt group 21. With the conveying operation of the conveyor belt group 21, the packaging bag can be placed inside the detection chamber 24, and the packaging bag is also located in the clamping chamber 25. With the rapid transmission of the conveyor belt group 21, based on the principle of fluid dynamics, when the packaging bag slides against the wind, the force exerted by the wind on the bag is used to make the bag body of the packaging bag bulge. If there are holes inside the packaging bag, when it slides against the wind, air can leak out from the holes in the bag body, and the bag body shape remains unchanged. The bag body shape change of the packaging bag is observed to achieve the sealing test of the packaging bag;

[0051] When the packaging bag is conveyed to the end of the upper belt 211, if the internal sealing of the packaging bag is intact, the bag body can be expanded and deformed. With the assistance of the fanning of the power fan 31, the upper surface of the packaging bag can be attached and adsorbed with the electrostatic adsorption film 4. With the rotation of the upper belt 211 and the lower end of the buckle group 22 being a soft material, the packaging bag can be separated from the lower belt 212. When the qualified packaging bags rotate with the upper belt 211 to the upper end of the conveyor belt group 21, the packaging bags with qualified sealing can be manually collected. If there are holes and gaps inside the packaging bag, when the packaging bag is subjected to wind flow detection, the bag body cannot be expanded, and the surface of the packaging bag with unqualified sealing cannot be attached with the electrostatic adsorption film 4 on the surface of the upper belt 211, resulting in the packaging bag with unqualified sealing falling between the two power fans 31, being assisted by the rotation of the power fan 31 for crushing, and then falling into the waste chamber 12 for recycling.

[0052] While the two power fans 31 are blowing on the packaging bag, impurities inside the packaging bag can also be blown away, so as to facilitate the subsequent use of the packaging bag with intact sealing. Under the blowing of the power fan 31, the dust will fall along the inner wall of the packaging bag into the dust storage bin 5 at the opening of the packaging bag, and because the inner wall of the dust storage bin 5 is in an arc-shaped state, the dust is not easy to re-enter the packaging bag. When the buckle group 22 rotates with the conveyor belt group 21, the dust in the dust storage bin 5 can be discharged.

[0053] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A sealing test device for packaging bags, comprising a device base (1), a universal wheel is installed at the bottom of the device base (1), a testing cavity (11) is provided on one side of the top of the device base (1), and a waste cavity (12) for collecting packaging bags with unqualified sealing properties is provided on a side of the top of the device base (1) away from the testing cavity (11), wherein: A detection component (2) is arranged inside the detection chamber (11), and when the detection component (2) drives the packaging bag to be conveyed against the wind, the sealing property can be detected by the shape change of the packaging bag, and the detection component (2) includes a buckle group (22), and the buckle group (22) limits the conveying detection position of the packaging bag to be detected; A fastening assembly (3) is arranged inside the waste chamber (12), and the fastening assembly (3) comprises a power fan (31) rotatably arranged inside the waste chamber (12). Two power fans (31) are arranged, and the power fans (31) can crush and recycle unqualified packaging bags. Meanwhile, the rotation of the power fans (31) can also blow and clean the inside of the packaging bags during the packaging bag detection process. When the fastening assembly (3) blows the packaging bags transported to one end of the waste chamber (12), it can assist the detection assembly (2) in adsorbing and collecting qualified packaging bags. The detection assembly (2) comprises a conveyor belt group (21) installed inside the detection chamber (11), the conveyor belt group (21) comprises an upper belt (211) and a lower belt (212), the upper belt (211) is movably connected to the inner wall of the detection chamber (11), the upper outer wall of the device base (1) is fixedly connected to two support plates (23), the lower belt (212) is rotatably arranged between the two support plates (23), and the surface of the upper belt (211) is paved with an electrostatic adsorption film (4); The fastening assembly (3) comprises a linkage group (33) connected to the end of the lower end belt (212); the linkage group (33) is located on the outer wall of the equipment base (1); the linkage group (33) is composed of an active member (331), a driven member (332) and a transmission belt (333); the transmission belt (333) is located between the active member (331) and the driven member (332); the active member (331) is connected to a rotating shaft on a side of the lower end belt (212) away from the support plate (23); the driven member (332) is fixedly connected to one end of the conical gear group (32); the two power fans (31) are meshedly connected to the surface of the conical gear group (32); the two power fans (31) are connected to the inner wall of the waste chamber (12) through the support member; and the two power fans (31) are in a slightly inclined state.

2. The sealing detection device for packaging bags according to claim 1 is characterized in that: A detection chamber (24) is formed inside the conveyor belt group (21), and a plurality of buckle groups (22) are installed on the surface of the conveyor belt group (21). The plurality of buckle groups (22) cooperate with each other to form a clamping chamber (25), and the clamping chamber (25) is used to clamp and limit the packaging bag to be tested.

3. The sealing detection device for packaging bags according to claim 2 is characterized in that: The buckle group (22) comprises a first buckle group (221) and a second buckle group (222); the first buckle group (221) is composed of a sleeve plate (2201) and a first soft fixing plate (2202); the sleeve plate (2201) is sleeved on a side surface of the first soft fixing plate (2202) away from the conveyor belt group (21); the second buckle group (222) is composed of an extension plate (2211) and a second soft fixing plate (2212); the extension plate (2211) is sleeved on a side surface of the second soft fixing plate (2212) away from the conveyor belt group (21).

4. The sealing detection device for packaging bags according to claim 3 is characterized in that: A dust storage bin (5) is provided on one side of the plurality of extension plates (2211) away from the second soft fixed plate (2212).

5. The sealing detection device for packaging bags according to claim 2, characterized in that: The plurality of buckle groups (22) are all arranged in a staggered manner, and are used to drive the packaging bags to be tested to perform staggered testing.

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