Flower Dad said:
It has been 3 years since the last constant temperature sleeping bag review.
At that time, there was no relevant standard reference for the constant temperature sleeping bag, and the reference of Hua Dad used the temperature ramp rate method to test the constant temperature effect.
In 2021, the group standard of "Infant and Child Phase Change Temperature Modulation Textile Products" has been introduced, which gives a test method for phase change temperature regulation performance - differential scanning calorimetry.
* Group standards are non-mandatory standards formulated by social groups in the absence of national, industrial, or local standards.
From T/CTES 1045-2021 "Infant and Child Phase Change Thermostat Textile Products"
Coupled with the increasing number of brand of constant temperature sleeping bags in recent years, Hua Dad decided to conduct another constant temperature sleeping bag evaluation.
directory
Thermostatic sleeping bag vs non-thermostatic sleeping bag
Evaluation samples
Evaluation metrics
Thermostatic effect
Workmanship details
Security detection
Overall
Consumption advice
The best overall performance in this assessment:
The principle of phase change material in thermostatic sleeping bag
The constant temperature sleeping bag can adjust the surface temperature according to the change of the ambient temperature, so that the temperature in the sleeping bag is always in the comfortable range.
This method of temperature regulation actually uses the characteristics of phase change materials (PCM= Phase Change Materials) to absorb heat or exothermic heat during the phase change process to maintain a constant temperature.
Principle: Take a chestnut, our most common phase change material - water.
When the temperature is higher than 0 ° C, the water changes from solid (ice) to liquid, absorbing heat in the environment, and the ambient temperature is reduced. When the temperature is as low as 0 °C, the water changes from liquid to solid (ice), releasing heat to the surrounding environment, and the ambient temperature rises.
Similarly, technicians implant phase change materials into fabric fibers in the form of microcapsules to make sleeping bags.
After the baby puts on this sleeping bag, when the external ambient temperature and body surface temperature rise to a certain temperature (such as 1-2 hours after falling asleep), the material begins to absorb heat, from solid to liquid, so that the temperature in the sleeping bag is reduced due to heat absorption.
When the ambient temperature and body surface temperature drop to a certain temperature (such as the second half of the baby's sleep), the material begins to change from liquid to solid, releasing heat and increasing the temperature in the sleeping bag.
In this way, the external ambient temperature fluctuates up and down, and the constant temperature sleeping bag will be "temperature adjusted" through the phase change material, forming a buffer zone with a relatively stable and suitable temperature in the sleeping bag.
Instead of a constant temperature sleeping bag is equivalent to an increased and thicker "warm underwear", which can only keep warm, and cannot adjust the temperature of the sleeping bag according to the ambient temperature.
Of course, "constant temperature" is exaggerated, and to be precise, it can play a role in "temperature regulation" within a certain range.
Hua Dad purchased 8 sleeping bags that claimed to have "constant temperature adjustment function" for evaluation.
Note: Due to different brands of sleeping bags, the applicable temperature of different specifications is not the same, so the style covering the applicable temperature of 20 °C is uniformly selected.
Tempering effect
As mentioned above, the temperature regulation means of the constant temperature sleeping bag is to use the characteristics of the phase change material.
Common phase change materials are Outlast, Cell Solution, etc.
Excerpted from "Application of New Temperature Modulation Materials in Clothing"
Hua Dad sent 8 sleeping bags to a professional testing agency, according to the group standard, using the differential scanning calorimetry (DSC) to test the enthalpy of molten, the larger the value, the better the temperature regulation effect.
The results are as follows:
brief summary:
1. The melt enthalpy of good H seeds is the largest, and its temperature regulation effect is the best.
2.l*ttle t*ny, Y ratio, ib**y, baby**re, the value of molten enthalpy is small, indicating that it is indeed the use of phase change materials, but the temperature regulation effect is more general.
3. Yan X, Mi L fish, be**bus did not detect molten enthalpy, indicating that the filler is not a phase change material.
Among them, Yan X and Mi L fish claimed to use phase change materials, and be**bus did not explicitly claim to use phase change materials.
In addition to the temperature control effect, let's also take a look at the details of the workmanship.
When the baby sleeps, he may wake himself up in the struggle of restraint due to the unreasonable design of the sleeping bag, the movement of hands and feet is restricted.
Therefore, for the "split-leg" sleeping bag, Hua Dad summarized some purchase points.
If a split leg sleeping bag can meet most of these requirements, it can create a good sleeping environment for the baby.
The workmanship details of the 8 thermostatic sleeping bags are as follows:
1. The necklines of the eight sleeping bags are all of good size.
2. Good H, Yan X and other 5 sleeves can be removed, sleeping bag can be used in spring and summer.
3. Only good H, l *ttle t *ny, can be Y comparable pants legs can be completely disassembled, change diapers more convenient.
Sleeping bags are in close contact with your child every night, and safety must be guaranteed!
According to GB 31701-2015 "Infant and Children's Textile Product Safety Technical Specifications", Hua Dad sent 8 sleeping bags to the formaldehyde project.
The results are as follows:
The formaldehyde content of be**bus exceeded the standard by more than double, and the remaining 7 models were not detected.
Be**bus is the only one of the 8 sleeping bags that does not claim to be a phase change material, but claims to be thermostat. According to the scientific literature, there are indeed non-phase change materials, but there are records of certain temperature regulation effects. However, the formaldehyde content of be**bus exceeded the standard, and Hua Dad thought that there was no need to study its temperature regulation effect.
summary
The measured temperature regulation effect is good and the workmanship is excellent.
Q1: How to choose the style of sleeping bag?
A1: Newborns are advised to opt for swaddling sleeping bags to prevent jumping. When the baby can crawl and walk, you can choose a split leg sleeping bag, and it is recommended to choose a split leg sleeping bag with sleeves in autumn and winter.
In addition, choose a white or light monochrome lined sleeping bag to prevent irritation to your baby's skin due to substandard dyes.
Q2: How to choose the thickness of the sleeping bag?
A2: Sleeping bags can be divided into summer, spring and autumn, and winter. Heating areas basically do not use the thickest winter pajamas, buy spring and autumn models.
Q3: How to choose the size of the sleeping bag?
A3: Choose a sleeping bag for your baby not too large or too tight.
Q4: How should sleeping bags, clothes and quilts be matched?
A4: When it is very cold at night in the unheated areas of the south, you can put on a slightly thicker pajamas and pajama pants for the baby and add a sleeping bag;
When it is very cold at night without heating in the north, put on a slightly thicker pajamas and pajama pants and add a sleeping bag, and at the same time, you can add a thin blanket; after heating, you can try thin pajamas and pajamas plus a medium and thick sleeping bag.
Mothers can explore the rules according to the actual situation of their children