It’s an essential step to require sample test before proceeding bulk order. We carry out a free sample policy to encourage our customers to test samples. Especially for trigger sprayers, there are a wide variety of trigger sprayers with different design, material, mechanism and functionality. And trigger sprayers can be highly customized including tailored colors, dip tube length, spray pattern and chemical compatibility. A sample approval before bulk order will minimize the chance of unnecessary loss and complaint.
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This article will introduce standard steps how to test pre-production samples (PPS) of trigger sprayers.
The first thing we should do when we open parcel sent from supplier is check samples’ appearance. Hold sample in hand and check if there is plastic flash, scratch, contamination, short shots, poor assemble etc. visual defects. If you required a color match sample, use color sample or Pantone color card. However, even you required a standard color sample. For example white color, it’s also necessary to check if the spray pump can fit on paired bottle. There are numerous variations in white color like pearl white and creamy white.
Weight check is an important but easily neglected testing step. There are countless factories making trigger sprayers, and their product pictures on website can look like the same thing. But different plastic wall thickness, invisible inside structure can lead to different dispensing performance and longevity. Weight check is one of useful methods to measure this. Simply put trigger sprayers(without dip tube and not used) on gram weigher and calculate average weight for at least 6 pieces of samples.
Make sure the trigger sprayers’ neck finish can pair with targeted containers, for example 28/400 trigger sprayers should pair with 28/400 neck finish bottles. Manufacturers should follow the same standard to make thread and closure which is established and issued by GPI (Glass Packaging Institute) and SPI (Society of the Plastics Industry). However, because of variables in manufacturing process and standard tolerance, even the same standard size trigger sprayer and bottles from different manufacturers may not perfectly fit. To be surefire, we need to move forward one more step. Firstly, require a technical drawing from supplier. Then use a ruler to measure samples’ dimension of at least “T” ,“E”, “H”. Compare the data with technical drawing and corresponding bottle’s dimension to make sure they fit.
“T” Dimension
Outside diameter of the thread. The tolerance range of the “T” dimension will determine the mate between bottle and closure.
“E” Dimension
Outside diameter of the neck. The difference between the “E” and “T” dimensions divided by two determines the thread depth.
“I” Dimension
Inner diameter of bottle neck. Specifications require a minimum “I” to allow sufficient clearance for filling tubes. Linerless closures w/ plug or land seal & dispensing plugs/fitments require controlled “I” dimension for proper fit.
“S” Dimension
Measured from the top of the finish to the top edge of the first thread. The “S” dimension is the key factor that determines orientation of the closure to bottle and the amount of thread engagement between the bottle and cap.
If this measuring work seems overwhelmed to you, no worry. We can skip to leak test. Afterall the main concern about neck finish fit is to prevent contained fluid from leakage. The normal method about leak test: Fill the solvent no less than 3/4, close with trigger sprayer with defined force and turn nozzle in off position, place bottle upside down at least for 24 hours, then confirm the leakage state.
Dip tube length of trigger sprayer samples should perfectly fit with paired bottles. Too long and it will bend too far in the bottle, too short and it won’t be able to reach product at the bottom. Standard measurement for dip tube length should be from bottom of gasket to the notch end of dip tube. Then measure the overall height of bottle, from top of bottle neck to the bottle bottom. It is also important to note if the container you are using features a “push up” at the bottom, meaning the bottom is raised. If there is a push up, subtract about 3/32” from the container length you previously measured to compensate. This step ensures proper flow through the dip tube.
Now, you get the numbers for dip tube length and bottle height. If the dip tube is flexible one, add about one inch to the bottle height, so that the dip tube should slightly bend toward the wall of your container, to maximize product dispensing.
If the dip tube is rigid, normally it’s fine to be equal to bottle height, but make sure end of dip tube is cut in angular or V-shaped no matter it comes with filter or not. Because flat dip tube end may sit flush to the bottom of bottle causing blockage and prevents pumping. Also, we have bend rigid tube available as well as some other suppliers, to prevent this happening.
Function test should be the main section in whole sample test. The scores on function test determine to a great extent if the sampled trigger sprayer can bring good product performance and user experience.
Prime times:
full fill bottle with fluid, count how many times of squeezes is used until the first spraying come out. This test somehow reflects the airtightness in piston and cylinder.
Output:
operate at least 30 times squeezes, spraying the fluid into a wide opening measuring cup. Then measure the total volume of fluid, divide corresponding squeeze times to get output.
Spray angle:
While a certain spray angle is needed, operate this test. Place trigger sprayer’s nozzle end at a certain distance from target surface(normally in 20cm), then squeeze trigger and measure the diameter of the wet area on surface. This should be operated indoor and spray fromabove down to minimize impact from gas flow and gravity.
Leak test:
press trigger at least 30 times to check if leakage occurs on nozzle end and piston, test on both spray and stream patterns.
Foaming test:
if trigger spray pump comes with foam nozzle, foaming test should be operated and check how long the foam can cling on target surface.
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Air venting:
normally air venting hole is visible under the gasket seal. Air venting hole prevent bottle from collapsible after multiple squeeze. So don’t forget to check if your test bottle is collapsed after multiple squeezes.
Fatigue test:
This could be the hardest part of test at customer’s end, as it may take thousands of squeeze and humans’ hand can’t bear for that. If not applicable on your end, ask supplier to proceed this test and submit test report. The purpose of this test is to ensure the trigger sprayers can empty chemical without defect, specially for those paired with high volume reservoirs. Supplier usually have customized machine to operate this test.
Most sprayer bodies are made of polypropylene (PP), but other components of the sprayer can be made of various plastics including high density polyethylene (HDPE), low density polyethylene (LDPE) or polyethylene terephthalate (PET). whereas some customers have needs to dispense strong acid / alkali or oily chemicals, a chemical compatibility test should be operated in those circumstances. Usually a soak test will be practical if applicable, disassemble the trigger sprayer samples( or ask supplier send separated components), take out all key components which may contact with chemicals during usage including nozzle cap, nozzle valve, cylinder, spring, piston, valve ball, dip tube. Soak component in related chemicals for 24-48 hours, then measure the components’ dimension to check inflation or shrinkage. Finally assemble component into completed product and test its performance. A simplified way is to use trigger spray pump for a few times, leave chemical reserved in trigger sprayers after use. Re-test them after 24-48 hours to check if blockage, leakage or other functionality defect occurs.
To begin, be sure that your intended container and sprayer have a compatible neck finish; for example, 28-400 containers should be paired with 28-400 trigger sprayers. The first number in a neck finish refers to the diameter in millimeters and the second number refers to the thread style. Each thread style has a corresponding number of turns; 400, for example, represents 1 thread turn. Neck finishes must match or your closure won’t fit the container properly, causing spills or leaks.
The most common neck finish for trigger sprayers is 28mm; however, manufacturers typically offer trigger sprayers from 20mm to 38mm as well as custom sizes. Mist sprayer pumps are typically available in smaller sizes such as 20mm because they are often paired with smaller volume bottles.
As the neck finish is one of the most important factors in selecting the best trigger sprayer for your application, find this detail in the title of all our sprayers and bottles.
The length of your sprayer’s dip tube is essential for proper closure and product dispensing. Too long and it will bend too far in the bottle, too short and it won’t be able to reach product at the bottom.
To find the length of a dip tube, measure from the gasket, which is located inside the cap, to the notch end of the tube. This is the usable length of your dip tube and varies from the total length as well as the length from the bottom on the cap to the end of the dip tube.
When calculating the best dip tube length for your application, you should consider the diameter and material of the tube itself and the product you are dispensing. Thinner dip tubes that typically accompany sprayers should slightly bend toward the wall of your container to maximize product dispensing. If you are using a sprayer, add about one inch to the height of the bottle. This will give enough length to properly bend inside the container without inhibiting dispensing.
If you are using a pump to dispense thicker or high viscosity products like lotion or condiments, the rigid dip tube should sit directly in the product with a small space between the tube and the bottom of the container. The tube should not touch the bottom of the container, but it should also not sit too high as it will not be able to pump product at the bottom. Sprayer dip tubes typically should not hover above the bottom of the container as they are not made to dispense thicker products.
Tube cutting ensures that the dip tube does not sit flush to the bottom of the container, which causes blockage and prevents pumping. Dip tubes are often cut at an angle so they cannot sit flush to the container. While sprayer dip tubes do need to be longer than the container, the notch end of the dip tube should not sit flush to the container. An angular or v-shaped cut prevents this from happening.
It is also important to note if the container you are using features a “push up” at the bottom, meaning the bottom is raised. If there is a push up, subtract about 3/32” from the container length you previously measured to compensate. This step ensures proper flow through the dip tube. Dip tubes can be cut to different lengths depending on the style of the tube and the type of bottle they're in. Learn more about how to measure and cut a dip tube to the desired length.
The sprayer you pick depends on the product you would like to dispense as well as how you would like to dispense it. Trigger sprayers are ideal for a wide variety of products including water, cleaning solutions, gardening chemicals, room sprayers, spritzers, and thinner body and hair care products. They are designed to dispense a greater amount of product over a larger surface area. Variances in trigger sprayers are largely cosmetic with different body shapes and colors.
However, many of our models have different features including varying dosages and nozzles. Some nozzles include a turn mechanism to allow for different spray patterns as well as a locking feature. Various colors allow for color-coding for easy identification of different products within your product line.
Spray is a traditional spray pattern where the product is dispensed in a conical shape from the nozzle.
Stream sprays are focused from a direct point, dispensing product with few droplets. This spray pattern is ideal for products that require high concentration of product in a smaller location.
Mist spray patterns tend to feature many small droplets and are ideal for products that require small dosages.
Foam delivers product in the form of foam rather than a conventional spray pattern.
Continuous spray patterns are unbroken rather than the standard burst dispensing of many traditional sprayers.
Dosage, or the amount of product dispensed with a single spray, is also important to consider when picking a sprayer. Dosages typically range from 0.22 ml to 1.5 ml. Higher dosages are recommended for products which require a larger spread (the surface area covered by the product being dispensed).
If you are looking to dispense products that require precision and gentle spraying like fragrance, hair products, sunscreen or oral care, our mist sprayers are the perfect choice. In addition to standard trigger sprayers, we also carry fine mist trigger sprayers for applications that require more precision. Fine mist trigger sprayers offer the precision of a traditional mist sprayer pump with the control of a trigger handle.
Standard trigger sprayers, also known as general use trigger sprayers, are one of the most popular options for common surface cleaners, hair gels, fabric fresheners, etc. Standard trigger sprayers typically feature a functional design suited for a variety of applications. Most general use designs include an adjustable nozzle to vary the spray.
High output triggers sprayers are characterized by a larger dosage per spray than standard or general use trigger sprayers. Often these closures can dispense 3.5 ml of liquid per squeeze compared to the more traditional output of anywhere from 0.22 ml to 1.5 ml. Common applications of high output trigger sprayers include some degreasers, detailing products in the automotive industry, insect control products and more.
Chemical and acid resistant trigger sprayers feature component parts with a higher degree of chemical resistance than traditional sprayers or misters. Harsh chemicals can eat away or negatively affect the materials used to make the closure. Replacing parts such as the gasket or dip tube with materials with a higher degree of chemical resistance, chemical resistant trigger sprayers are often suitable for dispensing harsh chemicals, household cleaners, carpet spot cleaners, etc.
Foaming trigger sprayers feature a unique design that dispenses a foam rather than a conventional spray pattern. Foaming sprays are useful for products where controlling the liquid on the surface is essential as well as for product that needs to sit on a surface for an extended period of time. Common applications include all-purpose cleaners, upholstery cleaners and carpet cleaners.
Shipper trigger sprayers are designed to be applied to the filled bottle prior to shipping. Often similar to general use trigger sprayers, these closures excel at preventing spilling or leaking that could result in product loss during transit.
Upside down trigger sprayers work well when the bottle is not held at an upright angle, even when the entire bottle is tilted completely upside down. This is often accomplished with a unique dip tube that can capture product either through a weighted end or secondary opening. Upside down trigger sprayers are ideal for cleaners or similar products where a user might need to adjust the angle of the bottle to reach the area they want to access.
Mist trigger sprayers still have the traditional trigger similar to a conventional trigger sprayer, but dispense a fine, light spray pattern to prevent soaking the desired spray location with too much product. Mist trigger sprayers work well for spray hand sanitizers, fabric fresheners, many hair products and more. Some mist trigger sprayers feature an adjustable nozzle. Mist trigger sprayers are more ergonomic than mist sprayer pumps and work well for products that may need more than a few sprays in one application.
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